DEVICE FOR CONTROLING A SWITCHING ENERGY SUPPLY CIRCUIT AND HEAT PUMP UNIT

专利摘要:
control device for switching power supply circuit, and heat pump unit. the patent refers to a switching power supply circuit that can improve efficiency while reducing the change in an input current. a mode controller (51) changes, together with an increase in electrical energy in the cutting circuits (3a and 3b), operating modes of the cutting circuits (3a and 3b) and a first mode for a third mode via a second mode. an operating controller (52) causes, in the first mode, the cutting circuit (3a) to perform a cutting operation, and the cutting circuit (3b) suspends the cutting operation, in the second mode, causes the cutting circuits (3a and 3b) perform the cutting operations alternately, and in the third mode it causes both cutting circuits (3a and 3b) to perform the cutting operations.
公开号:BR112014005225B1
申请号:R112014005225-5
申请日:2012-08-22
公开日:2020-12-15
发明作者:Norio Sakae；Kazuhiro Ohshita；Toshio Yabuki；Junya Mitsui
申请人:Daikin Industries, Ltd；
IPC主号:

专利说明:

TECHNICAL FIELD
[001] The present invention relates to a device for controlling a switching power supply circuit and a heat pump unit, in particular to a device for controlling a switching power supply circuit having a plurality of circuits choppers. BACKGROUND TECHNIQUE
[002] Patent document 1 describes a power factor correction device having two stepped switching converters. In patent document 1, there are modes used in which the operating periods of two stepped switching converters are different from each other, while the switching of the modes depending on an actual output current of the correct device. In more detail, six modes are used as these modes. In particular, mode 0 is a mode in which the two stepped switching converters operate continuously. Mode 1 is a mode in which the operation or suspension of the two stepped switching converters is repeated so that parts of the operating periods of the two stepped switching converters are temporarily overlapped. Mode 2 is a mode in which the suspension periods of the stepped switching converters are longer than in mode 1. Mode 3 is a mode in which the suspension periods are even longer and the operations of the two stepped switching converters are not overlapping. Mode 4 is a mode in which one of the stepped switching converters is suspended, and the operation and suspension of the stepped switching converter is repeated. Mode 5 is a mode in which the suspension period of the other switching converter is longer than in mode 4.
[003] In patent document 1, when a load current is low and currents flowing through the switching elements of the stepped switching converters are low, mode 4 or mode 5 is used. Thus, an energy source efficiency is improved.
[004] In addition, as the technology related to the present invention, the patent document 1 and the non-patent document 1 are described. PREVIOUS TECHNICAL DOCUMENT PATENT DOCUMENT
[005] Patent Document 1: published Japanese patent application No. 2009-159727
[006] Patent Document 2: published Japanese patent application No. 2008-193818 NON-PATENT DOCUMENT
[007] Non-Patent Document 1: Mamoru Kitamura, "Creating a 1.5 kW Low-Noise Power Supply with High Harmonic Suppression - The R2A20112 Critical Conduction Mode / Interleaving PFC IC", Transistor Gijutsu, May 2008 Edition, CQ Publishing Co., Ltd, August 2008, pages 176-184. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION
[008] In modes 4 and 5 of Patent Document 1, a stepped switching converter is suspended, and the operation / suspension of the other stepped switching converter is repeated. In this way, the variation of an input current is created due to its operation or suspension.
[009] In view of the above, an objective of the present invention is to provide a control device for a switching power supply circuit that can improve efficiency while reducing the variation of the input current. MEANS OF SOLVING PROBLEMS
[0010] A first aspect of a device for controlling a switching power supply circuit according to the present invention is a control device for a switching power supply circuit, the switching power supply circuit including a pair of input terminals (P1, P2), a pair of output terminals (P3, P4), and first and second chopper circuits (3, 3a, 3b) that are connected in parallel to each other between the pair of terminals input and the pair of output terminals and each of which performs a limiting operation, the control device including a mode controller (51) which operates to change an operating mode of the first and second chopper circuits in a first way to a third mode through a second mode as electrical energy in the first and second chopper circuits increases, and an operation controller (52) that operates to make the first chopper circuit perform the limitation, and the second chopper circuit suspends the limiting operation in said first mode, to cause the first chopper circuit and the second chopper circuit to alternately perform the limiting operation in said second mode, and to make both the the first chopper circuit and the second chopper circuit perform the limiting operations in said third mode.
[0011] A second aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the first aspect, where a voltage source constant is connected between the pair of input terminals, and the control device additionally includes a current detection unit (60, 61, 62) that detects an input current (I) flowing through the pair of input terminals (P1 , P2), where the mode controller (51) operates to change the operating mode from the first mode to the third mode through the second mode as the input current increases.
[0012] A third aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the first or second aspect, the switching device control additionally including a period detection unit (70) that counts the elapsed time, where the operation controller (52) waits to suspend, in the second mode, the limiting operation of the first chopper circuit in a condition in which a period of predetermined time has passed since the start of the limiting operation of the first chopper circuit (3a, 3b).
[0013] A fourth aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the first or the second aspect, the device control unit additionally including a second current detection unit (61) that detects a current flowing through the first chopper circuit (3a), where the operation controller (52) operates to suspend, in the second mode, the limiting operation of the first chopper circuit in a condition that a value of an integrated current from the start of the limiting operation of the first chopper circuit (3a, 3b) is greater than a predetermined value.
[0014] A fifth aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the fourth aspect, where the mode controller (51) operates to change the operating mode to the first mode in a condition in which in the second mode, the current is less than a predetermined value.
[0015] A sixth aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the first or second aspect, the switching device control additionally including a second current detection unit (61) that detects a current flowing through the first chopper circuit (3a), where in the second mode, the operation controller (52) operates to switch the execution or suspension of the limiting operation of the first chopper circuit with a shorter period as the current is greater.
[0016] A seventh aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the first or second aspect, the switching device control additionally including a temperature detection unit (81) that detects a temperature of the first chopper circuit (3a, 3b) where the operation controller (52) operates to suspend, in the second mode, the limiting operation of the first chopper circuit in a condition in which the temperature is greater than a predetermined value.
[0017] An eighth aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the first or second aspect, the switching device control additionally including a first and a second temperature detection unit (81, 82) that detect the temperatures of the first and second chopper circuits (3a, 3b), respectively where the operation controller (52) operates to suspend, in the second mode , the operation of limiting the first chopper circuit in a condition in which a temperature of the first chopper circuit is higher than a temperature of the second chopper circuit by a value above a predetermined value.
[0018] A ninth aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the seventh or eighth aspect, where the controller mode (51) operates to change the mode of operation to the first mode when in the second mode, the temperature is less than a second predetermined value which is less than the predetermined value.
[0019] A tenth aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to the first or second aspect, the switching device control additionally including a counter unit (90) that counts the number of cuts in the limiting operation of the first chopper circuit (3a, 3b), where the operation controller (52) operates to suspend, in the second mode, the limiting operation of the first chopper circuit in a condition in which the number from the beginning of the limiting operation of the first chopper circuit is greater than a predetermined value.
[0020] An eleventh aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to any one of the first to the eleventh aspects, the control device additionally including a rectifier circuit (2) that rectifies an AC voltage and applies a DC voltage to the pair of input terminals and a voltage detection unit (10) that detects the AC voltage or DC voltage, where the operation controller (52) operates to initiate or suspend, in the second mode, the limiting operation of the first chopper circuit in a period in which an absolute value of the AC voltage is less than a predetermined value.
[0021] A twelfth aspect of the device for controlling a switching power supply circuit according to the present invention is the control device for a switching power supply circuit according to any of the first to eleventh aspects , the control device additionally including a rectifier circuit (2) that rectifies an AC voltage and applies a DC voltage to the pair of input terminals, and a third current detection unit (13, 60, 61, 62) that detects a AC current flowing on one input side of the rectifier circuit or input current, where the operation controller (52) operates to initiate or suspend, in the second mode, the limiting operation of the first chopper circuit in a period in which an absolute value AC current is less than a predetermined value.
[0022] A first aspect of a heat pump unit according to the present invention, including a device for controlling a switching power supply circuit according to any one of the first to twelfth aspects. EFFECTS OF THE INVENTION
[0023] According to the first aspect of the device for controlling a switching power supply circuit according to the present invention, when the electrical energy is low and the increase in temperature is relatively small, the first mode is used. In this way, the change in the input current associated with the switching between the limiting operation of the first chopper circuit and the limiting operation of the second chopper circuit can be reduced. In addition, when the electrical power increases, the operating mode is switched from the case of the first mode to the second mode. In this way, in comparison with the first mode, in which only the first chopper circuit is made to perform the limiting operation, the increase in temperature of the first chopper circuit can be reduced. As a result, the reduction in efficiency due to the increase in temperature associated with the increase in electrical energy can be reduced. When the electricity increases even more, both the first and second chopper circuits perform the limiting operations. In addition, when the electrical power is low, the switching loss of the switching element used for the limiting operation has a high percentage of the total loss, and when the electrical power is high, the loss of conduction of the switching element has a high percentage. In the third mode, since the first and second chopper circuits perform the limiting operations, the current flowing through each of the switching elements can be reduced, where efficiency can be improved.
[0024] According to the second aspect of the device for controlling a switching power supply circuit according to the present invention, when the input current increases, since the electrical energy entering the first and second chopper circuits increases, the electrical energy in the first and second chopper circuits increases. Accordingly, this contributes to the realization of the control device according to the first aspect.
[0025] According to the third aspect of the device for controlling a switching power supply circuit according to the present invention, the first chopper circuit is made to carry out or suspend the limiting operation, depending on a period of time. As a result, the limiting operation of the first chopper circuit can be performed or suspended by a low-cost circuit, where the increase in production cost can be reduced.
[0026] According to the fourth aspect of the device to control a switching power supply circuit according to the present invention, since the temperature depends on the value of an integrated current, the temperature of the first chopper circuit can be controlled with accuracy compared to the third aspect.
[0027] In accordance with the fifth aspect of the device for controlling a switching power supply circuit according to the present invention, unnecessary switching of the operation and suspension can be avoided.
[0028] In accordance with the sixth aspect of the device for controlling a switching power supply circuit according to the present invention, when a rate of temperature rise is estimated to be high, a period of execution or suspension of the operation of limitation of the first chopper circuit is short. As a result, the temperature rise can be controlled efficiently.
[0029] According to a seventh aspect of the device for controlling a switching power supply circuit according to the present invention, the temperature of the first chopper circuit can be precisely controlled.
[0030] According to an eighth aspect of the device for controlling a switching power supply circuit according to the present invention, the heat can be efficiently dispersed.
[0031] According to a ninth aspect of the device for controlling a switching power supply circuit according to the present invention, unnecessary switching of the operation or suspension can be avoided.
[0032] The tenth aspect of the device for controlling a switching power supply circuit according to the present invention contributes to the realization of the control device according to the first aspect without using a temperature detection sensor. As a result, the increase in production costs can be controlled.
[0033] According to the eleventh aspect of the device for controlling a switching power supply circuit according to the present invention, when the absolute value of the AC voltage is small, the switching of the operation or suspension of the first chopper circuit is fulfilled. As a result, the variation in AC voltage and the variation in AC current can be reduced.
[0034] According to the twelfth aspect of the device for controlling a switching power supply circuit according to the present invention, when the absolute value of the AC current is small, the switching of the operation or suspension of the first chopper circuit is fulfilled. As a result, the variation in the AC current can be reduced.
[0035] According to the first aspect of the heat pump unit according to the present invention, the heat pump unit can be provided in which the reduction in efficiency of the first chopper circuit due to an increase in temperature can be reduced.
[0036] An objective, a characteristic, an aspect, and an advantage of the present invention will be made apparent by the following detailed description and attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Fig. 1 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0038] Fig. 2 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0039] Fig. 3 is a diagram illustrating an example of a schematic configuration of a chopper circuit;
[0040] Fig. 4 is a diagram illustrating an example of a schematic configuration of a chopper circuit;
[0041] Fig. 5 is a diagram to illustrate a mode of operation;
[0042] Fig. 6 is a diagram to illustrate a mode of operation;
[0043] Fig. 7 is a diagram to illustrate a mode of operation;
[0044] Fig. 8 is a diagram to illustrate changes in operating modes;
[0045] Fig. 9 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0046] Fig. 10 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0047] Fig. 11 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0048] Fig. 12 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0049] Fig. 13 is a diagram, illustrating an example of a schematic configuration of a switching power supply circuit;
[0050] Fig. 14 is a diagram illustrating an example of a chopper circuit temperature;
[0051] Fig. 15 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0052] Fig. 16 is a diagram illustrating an example of a chopper circuit temperature;
[0053] Fig. 17 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0054] Fig. 18 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0055] Fig. 19 is a diagram illustrating an example of a schematic configuration of a switching power supply circuit;
[0056] Fig. 20 is a diagram illustrating a short-time oscillation indicator;
[0057] Fig. 21 is a diagram illustrating an example of a schematic configuration of a heat pump unit. DESCRIPTION OF THE MODALITIES FIRST MODE SWITCHING ENERGY SUPPLY CIRCUIT
[0058] As exemplified in Fig. 1, a switching power supply circuit is equipped with a plurality of chopper circuits 3, input terminals P1 and P2, and output terminals P3 and P4.
[0059] Between the input terminals P1 and P2 a first DC voltage is applied. In the example in Fig. 1, a rectifier circuit 2 is connected to the input terminals P1 and P2. The rectifier circuit 2 rectifies an AC voltage from an AC power source 1 and applies a first DC voltage having been rectified, between the input terminals P1 and P2. Here, the potential applied to input terminal P2 is less than the potential applied to input terminal P1. Note that the connection of the rectifier circuit 2 with the input terminals P1 and P2 is not an essential condition. An arbitrary configuration for applying the first DC voltage between input terminals P1 and P2 need only be connected to input terminals P1 and P2.
[0060] The plurality of chopper circuits 3 is connected in parallel to each other between the pair of input terminals P1 and P2 and the pair of output terminals P3 and P4, and each performing a limiting operation. By this limiting operation, each chopper circuit 3 changes the first DC voltage between input terminals P1 and P2, and applies this between output terminals P3 and P4 as the second DC voltage. A detailed configuration about the chopper circuit 3 will be described later.
[0061] Between the output terminals P3 and P4, a smoothing capacitor C1 is provided. The smoothing capacitor C1 smooths the second DC voltage of the chopper circuits 3.
[0062] Alternatively, as shown in Fig. 1, between the input terminals P1 and P2 a capacitor C2 can be provided. Capacitor C2 can reduce noise in the current that enters the chopper circuits 3.
[0063] Chopper circuit 3 is a staggered chopper circuit, for example. In Fig. 2, as the plurality of chopper circuits 3, two chopper circuits 3a and 3b are illustrated. Note that in the example in Fig. 2, an inverter 4 is connected to the input terminals P3 and P4. However, in addition, an arbitrary load to which a DC voltage is supplied can be connected to output terminals P3 and P4.
[0064] In the example of Fig. 2, the chopper circuit 3a is equipped with a switching element S1, a reactor L1, and a diode D1. The reactor L1 and diode D1 are connected in series to each other on a DC line LH1 connecting the input terminal P1 and the output terminal P3. The reactor L1 is arranged on the side of the input terminal P1 of diode D1. Diode D1 is arranged with the anode directed to the side of the input terminal P1. The switching element S1 is, for example, an MOS electric field effect transistor, an isolated port bipolar transistor, or similar, and is provided between a connection point connecting reactor L1 and diode D1 and a DC line LL connecting the input terminal P2 and the output terminal P4.
[0065] In the following, the operation to limit the chopper circuit 3a will be described. In this limiting operation, the on / off of switching element S1 is switched repeatedly. Here, when switching element S1 is switched on, current flows from input terminal P1 to output terminal P2 through reactor L1 and switching element S1. At that time, electromagnetic energy is accumulated in the L1 reactor. When switching element S1 is switched off, current flows from input terminal P1 to output terminal P2 through reactor L1, diode D1, and smoothing capacitor C1. At that moment, in addition to the smoothing capacitor C1, the second DC voltage that is obtained by adding the first DC voltage between the input terminals P1 and P2 for an inductive voltage generated in the L1 reactor is applied. In this way, the smoothing capacitor C1 is applied with the second DC voltage which is greater than the first DC voltage.
[0066] The chopper circuit 3b is equipped with a switching element S2, a reactor L2, and a diode D2. The reactor L2 and diode D2 are connected in series to each other on the DC line LH2 connecting the input terminal P1 and the output terminal P3. The reactor L2 is arranged on the side of the input terminal P1 of diode D2. Diode D2 is arranged with the anode directed to the side of the input terminal P1. The switching element S2 is, for example, an MOS electric field effect transistor, an isolated port bipolar transistor, or similar, and is arranged between the connection point connecting the L2 reactor and the D2 diode and the DC line. LL.
[0067] Since the operation of chopper circuit 3b is similar to chopper circuit 3a, a detailed description will not be provided.
[0068] With these chopper circuits 3a and 3b, even when the switching elements S1 and S2 are connected, a current flows through the input terminals P1 and P2, thus an angle of conduction of the AC current that enters the rectifier circuit 2 can be increased. Therefore, an energy factor on the input side from now on, also referred to as "input energy factor" can be improved. In other words, the switching power supply circuit works like a power factor correction circuit. Power Factor Correction Circuit.
[0069] Note that the chopper circuit 3 does not have to be a stepped chopper circuit. For example, as shown in Fig. 3, a stepped chopper circuit may be possible. In this stepped chopper circuit, a switching element S1 and a reactor L1 are connected in series to each other on the DC line connecting the input terminal P1 and the output terminal P3. The switching element S1 is arranged on the side of the input terminal P1 of the L1 reactor. A diode D1 is provided between the connection point connecting the switching element S1 and the reactor L1 and the DC line LL connecting the input terminal P2 and the output terminal P3. Diode D1 is arranged with the anode directed to the line side DC LL.
[0070] In addition, in the limiting operation of this chopper circuit 3, the on / off of the switching element S1 is switched repeatedly. When switching element S1 is switched on, current flows from input terminal P1 to output terminal P2 through switching element S1, reactor L1 and smoothing capacitor C1. At this moment, since the inductive voltage generated in the L1 reactor has a higher potential on the input terminal side, the smoothing capacitor C1 is applied with a voltage that is obtained by subtracting the induction voltage from the first DC voltage between the input terminals P1 and P2. When switching element S1 is switched off, current flows through reactor L1, smoothing capacitor C1 and diode D1.
[0071] By the operation above, the chopper circuit 3 can scale down the first DC voltage and send it as the second DC voltage. In addition, during the period in which the switching element S1 is connected, the current flows through the input terminals P1 and P2, where the current conduction angle can be increased. However, the use of the chopper circuit 3 in Fig. 2 can further reduce the high frequency components of the current flowing through the input terminals P1 and P2. This is due to the fact that in the chopper circuit 3 of Fig. 2, current flows through the input terminals P1 and P2 regardless of the on / off of the switching element S1. Therefore, from the point of view of reducing high frequency components of the current, it is preferable to use the chopper circuit 3 of Fig. 2.
[0072] Alternatively, the chopper circuit 3 can be an up / down scaling chopper circuit as exemplified in Fig. 4. In the up / down scaling chopper circuit, a computing element S1 and a diode D1 are connected in series with one the other the DC line connecting the input terminal P1 and the output terminal P3. The switching element S1 is arranged on the side of the input terminal P1 of diode D1. The diode D1 is arranged with the anode directed to the output terminal P3. A reactor L1 is provided between the connection point connecting the switching element S1 and diode D1 and the DC line LL connecting the input terminal P2 and the output terminal P4.
[0073] In addition, in the operation of limiting the chopper circuit 3, the switching element S1 is switched on / off repeatedly. When switching element S1 is switched on, current flows from input terminal P1 to output terminal P2 through switching element S1 and reactor L1. This causes the electromagnetic energy to accumulate in the L1 reactor. When switching element S1 is switched off, the inductive voltage generated in reactor L1 acts as a power source, and current flows through the smoothing capacitor C1 and diode D1. As the switching period of switching element S1 is extended, a higher voltage is applied to the smoothing capacitor C1.
[0074] By adjusting the switching period of switching element S1, the chopper circuit 3 can scale the first DC voltage upwards or downwards. In addition, during the period in which the switching element S1 is connected, the current flows through the input terminals P1 and P2, where the current conduction angle can be increased. However, the use of the chopper circuit 3 in Fig. 2 can further reduce the high frequency components of the current flowing through the input terminals P1 and P2. This is due to the fact that in the chopper circuit 3 of Fig. 2, current flows through the input terminals P1 and P2 regardless of the on / off of the switching element S1. Therefore, from the point of view of reducing the high frequency components of the current, it is preferable to use the chopper circuit 3 of Fig. 2.
[0075] Below, a description will be made for the case in which an upwardly scaled chopper circuit is used as the chopper circuit 3 and the description will be made for the case in which two chopper circuits 3 are provided.
[0076] The switching elements S1 and S2 of the chopper circuits 3a and 3b are controlled by controller 5. Controller 5 is equipped with a mode controller 51 and an operation controller 52. Mode controller 51 instructs the operation controller 52 to select the following modes M1-M3 as the operating modes for chopper circuits 3a and 3b.
[0077] In M1 mode, as exemplified in Fig. 5, the operation controller 52 causes any of the chopper circuits 3a and 3b to constantly perform the limiting operation. For example, the operation controller 52 repeatedly switches the switching element S1 on and off to cause the chopper circuit 3a to constantly perform the limiting operation, and causes the switching element S2 to be constantly switched off to suspend the limiting operation. of chopper circuit 3b.
[0078] In M2 mode, as shown in Fig. 6, the operation controller 52 causes chopper circuits 3a and 3b to perform the limiting operation alternately. In the example of Fig. 6, the switching timings for the execution and suspension of the limiting operations of the chopper circuits 3a and 3b are identical to each other, however, the timings may be different from each other.
[0079] In M3 mode, as shown in Fig. 7, the operation controller 52 causes both chopper circuits 3a and 3b to constantly perform the limiting operations. At that time, it is preferable that the operating controller 52 controls the switching elements S1 and S2 so that the switching periods of the switching elements S1 and S2 are out of sync. In more detail, for example, the timing of the start-up and end-end of the switching-on period of switching element S2 is delayed, for half a period of the switching period, with respect to the timing of the start and ending of the switching-on period of switching element S1. . Such control is well known as described in Non-Patent Document 1, where a detailed description will be omitted. Thus, the high frequency components of the current flowing through the input terminals P1 and P2 can be reduced. Such control is also referred to as interleaving.
[0080] The mode controller 51 selects the modes described above M1-M3 as follows. That is, the mode controller 51 changes the operating modes of chopper circuits 3a and 3b from mode M1 through mode M2 to mode M3 as the electrical power of chopper circuits 3a and 3b increases.
[0081] In the modality, as electrical energy, an input current I flowing through the input terminals P1 and P2 and detected, for example. The validity of this will be described below. In the example in Fig. 2, the first DC voltage applied to the input terminals P1 and P2 is a voltage obtained by rectifying the AC voltage of the AC power source 1. Since the amplitude and period of the AC voltage can be considered constant, the amplitude and pulsation period of the first DC voltage can also be considered constant. Thus, an average value of the first DC voltage is constant for a period of AC voltage, for example. Therefore, the first DC voltage can be considered to be a constant voltage source having a ripple.
[0082] On the other hand, the AC current flowing on the input side of the rectifier circuit 2 has an ideal sine wave shape, where the input current I has a half wave shape the shape of the absolute value of a wave of sine ideally. The first DC voltage is a constant voltage source, so as the amplitude of the input current I increases, the electrical energy entering the chopper circuits 3a and 3b increases. Thus, by detecting the input current I, the electrical energy in the chopper circuits 3a and 3b can be identified.
[0083] In the example of Fig. 2, current detection units 61 and 62 are provided, each of which detects each of the currents IL 1 and IL 2 flowing through reactors L1 and L2. The detection values of the current detection units 61 and 62 are sent to controller 5. Controller 5 adds the detection values of current detection units 61 and 62 to obtain input current I.
[0084] Then, as exemplified in Fig. 6, the mode controller 51 uses the M1 mode when the amplitude of the input current I is less than a predetermined value Iref1; the M2 mode when the amplitude of the input current I is greater than the predetermined value Iref1 and less than a predetermined value Iref2; and the M3 mode when the amplitude of the input current I is not necessarily obtained, and an average value or a maximum value of the input current I for about a period of the AC voltage can be obtained, and the modes M1 to M3 can be obtained. used accordingly.
[0085] According to the above mode switching operation, when the electrical energy in chopper circuits 3a and 3b is low, and the increase in temperature of chopper circuits 3a and 3b is relatively low, the M1 mode is used. This makes it possible to change the control in the input current I associated with the switching between the limiting operation of the chopper circuit 3a and the limiting operation of the chopper circuit 3b.
[0086] Additionally, when electricity is low, a percentage of switching loss in the loss created when switching the power supply circuit is large. Thus, when the electrical energy is low, causing only the chopper circuit 3a to perform the limiting operation, efficiency can be improved.
[0087] Additionally, when the electrical energy in the chopper circuits 3a and 3b increases, the M2 mode is used. At that moment, as exemplified in Fig. 6, the temperature Ta of the chopper circuit 3a increases in the period when the chopper circuit 3a operates, and decreases in the period when the chopper circuit 3a is suspended. In this way, the temperature Ta of chopper circuit 3a can be lower than the case in which only chopper circuit 3a is operated. Similarly, the temperature Tb of the chopper circuit 3b can also be reduced. The temperature rises of the chopper circuits 3a and 3b increase the conduction losses of the switching elements S1 and S2, respectively, therefore, the efficiency of the switching power supply circuit can be improved.
[0088] When the electrical energy in chopper circuits 3a and 3b increases even more, the M3 mode is used. In M3 mode, both chopper circuits 3a and 3b perform the limiting operations. Thus, the current flowing through the switching elements S1 and S2 can be reduced. This is because the current flowing through only any of the switching elements S1 and S2 in the M2 mode can be shared by the switching elements S1 and S2 in the M3 mode. Thus, when the electrical energy is large, the percentage of the conduction loss in the loss created in the switching power supply circuit is large, therefore, by reducing the current flowing through the switching elements S1 and S2, efficiency can be improved.
[0089] Additionally, in the M3 mode, the chopper circuits 3a and 3b can be made to perform the limiting operations by the interleaving method. This can reduce the high frequency components of the input current I.
[0090] Note that it is not necessary to supply two current detection units 61 and 62, and one current detection unit to detect an input current I flowing through the input terminal P1 or the output terminal P2 can be provided.
[0091] These current detection units can be used for purposes to be described below. For example, it is possible to detect excessive current flowing through chopper circuits 3a and 3b. In this way, the connection to the AC power source can be cut by detecting such excessive current. Such a cut can be carried out, for example, by providing a switch between the AC power source and the rectifier circuit 2 and turning off the switch.
[0092] Alternatively, when current detection units 61 and 62 are provided, these current detection units 61 and 62 can be used for the following purpose. That is, in a critical current mode in which the on / off of the switching elements S1 and S2 is switched in the state where the currents IL 1 and IL 2 are equal to zero, the current detection units 61 and 62 can be used to detect the state where the IL 1 and IL 2 currents become equal to zero.
[0093] In case the current detection unit can be used for other purposes as described above, it is not necessary to supply a current detection unit again and an increase in the production cost can be controlled. SECOND MODE
[0094] In the second mode, a description will be made of an example of a condition in which the operations for limiting chopper circuits 3a and 3b are switched in M2 mode. In the second mode, the operations for limiting the chopper circuits 3a and 3b are switched in each predetermined period of time. In the example in Fig. 9, the switching power supply circuit is additionally equipped with a period detection unit 70. The period detection unit 70 detects, for example, that a predetermined reference period has passed since the beginning of the operation of each chopper circuit 3a and 3b. For example, the period detection unit 70 has a timer circuit and a determination unit. The timer circuit is initialized by the operation controller 52 when each of the chopper circuits 3a and 3b starts to operate. The unit of determination determines whether a time elapsed counted by the timer circuit is longer than the reference period, and if a positive determination is made, the unit of determination informs operation control 52 accordingly.
[0095] Provided that the time elapsed since the start of operation of the chopper circuit 3a is greater than the reference period, the operation controller 52 suspends the limiting operation of the chopper circuit 3a and causes the chopper circuit 3b to perform the limiting operation. Note that the operation suspension of the chopper circuit 3a and the start of operation of the chopper circuit 3b can be carried out simultaneously, or one can be carried out earlier than the other. However, it is preferable that the suspension of the operation of one of the chopper circuits 3a and 3b is carried out at the same time as or after the start of the operation of the other. This can avoid the period in which none of the chopper circuits 3a and 3b performs the limiting operation. Since the input power factor decreases in the period when none of the chopper circuits 3a and 3b performs the limiting operation, such a reduction in the input power factor can be controlled. Note that since the switching of the chopper circuit limitation operations 3a and 3b is the same in other modalities to be described later, the description will be omitted.
[0096] Additionally, the timer circuit is used to count the time spent in the example above, however, other configurations may be possible. As shown in Fig. 10, the period detection unit 70 can be equipped with a voltage detection unit 71 and a determination unit 72. The voltage detection unit 71 detects, for example, the AC voltage on the rectifier circuit input 2. Determination unit 72 determines whether such AC voltage becomes a predetermined standard voltage value for example, equal to zero, and if a positive determination is made, determination unit 72 informs operation controller 52 , according. Operation controller 52 can switch the chopper circuits 3a and 3b limiting operations when such AC voltage becomes the standard voltage value. For example, if zero is used as the standard voltage value, the operations for limiting chopper circuits 3a and 3b can be switched every half-time of the AC voltage. In other words, like the reference period, half of the AC voltage period can be used. THIRD MODE
[0097] In the third mode, a description will be made of an example of a condition in which the operations for limiting chopper circuits 3a and 3b are switched in M2 mode. In the example of Fig. 11, the switching power supply circuit is equipped with two current detection units 61 and 62. Current detection units 61 and 62 detect current flowing through chopper circuits 3a and 3b. In the example of Fig. 11, current detection units 61 and 62 detect currents IL 1 and IL 2 flowing through reactor L1 and L2.
[0098] Controller 5 is additionally equipped with a current integration unit 63 and a determination unit 64. The current integration unit 63 integrates currents IL 1 and IL 2 from the start of operation of the chopper circuits 3a and 3b. The determination unit 64 determines whether the value of the integrated current is greater than a predetermined standard integration value, and if a positive determination is made, the determination unit 64 informs the operating controller 52 accordingly.
[0099] Provided that the current value IL 1 has been integrated since the start of the chopper circuit limitation operation 3a is greater than a standard integration value, the operation controller 52 suspends the chopper circuit limitation operation 3a and causes the chopper circuit 3b to perform the limiting operation. In addition, the current integration unit 63 initializes the current integration value IL 1 to be equal to zero according to the suspension of the chopper circuit 3a limitation operation. Similarly, in the condition in which the value of the current IL 2 having been integrated from the start of the operation of the chopper circuit 3b is greater than the standard integration value, the operation controller 52 suspends the limiting operation of the chopper circuit 3b and causes chopper circuit 3a to perform the limiting operation. In addition, the current integration unit 63 initializes the current integration value IL 2 to be equal to zero according to the suspension of the limiting operation of the chopper circuit 3b.
[00100] Here, the temperature rise in chopper circuits 3a and 3b occurs due to Joule heat and the like. In this way, the temperature rise in chopper circuits 3a and 3b depends on a Joule heat integration value with respect to time. On the other hand, the Joule heat created in the chopper circuit 3a depends on the current flowing through the chopper circuit 3a. As a result, the temperature rise in the chopper circuit 3a depends on the integration value with respect to the time of the current flowing through the chopper circuit 3a.
[00101] According to the present control method, the operations of chopper circuits 3a and 3b are switched depending on the value of the integrated current, where the temperatures of chopper circuits 3a and 3b can be controlled relatively precisely.
[00102] Note that the current detection unit does not need to be supplied according to the number of chopper circuits 3a and 3b. In the example in Fig. 12, a current detection unit 60 is provided, and the current detection unit 60 detects current flowing through the input terminal P2. Note that the current detection unit 60 can detect current flowing through the input terminal P1.
[00103] The current integration unit 63 integrates the current detected by the current detection unit 60. Then, each time the integration value exceeds the standard integration value, the operation controller 52 only needs to switch the limiting operations chopper circuits 3a and 3b and initializes the integration value to be equal to zero.
[00104] Note that these current detection units 60, 61 and 62 can be used to detect excessive current flowing through chopper circuits 3a and 3b as described in the first modality, and current detection units 61 and 62 they can be used to make chopper circuits 3a and 3b perform limiting operations in critical current mode. As described above, in the case where current detection units 60, 61 and 62 can be used for other purposes, a current detection unit does not need to be newly supplied, where an increase in production cost can be controlled.
[00105] Provided that in M2 mode, the amplitude or, for example, the average value or the maximum value of the AC voltage for about a period; this applies from now on the current detected by any of the current detection units 60, 61 and 62 is less than the predetermined value, the mode controller 51 can switch the operating mode to the M1 mode. This can avoid unnecessary switching between chopper circuits 3a and 3b in case the current is low and the temperature rise is small.
[00106] It is preferable that the operation controller 52 controls so that, for example, as the current amplitude detected by the current detection units 60, 61 and 62 is greater, the operations of limiting the chopper circuits 3a and 3b are switched over a shorter period. In other words, it is preferable that as the current increases, the execution or suspension of the chopper circuit 3a limiting operation is switched with a shorter period. This is because as the current is higher, the rates of temperature rise in the chopper circuits 3a and 3b are higher, thus making the switching period shorter for the higher current, the temperature of the chopper circuits 3a and 3b can be controlled more adequately.
[00107] Here, in the third mode, when the value of the integrated current is greater than the value of standard integration, the limiting operations are switched. For a higher current, the integration value exceeds the standard integration value in a shorter period, thus, for the higher current, the limiting operations of chopper circuits 3a and 3b are switched with a shorter period. Therefore, also by this control method, the temperatures of the chopper circuits 3a and 3b can be adequately controlled.
[00108] Alternatively, for example, in case the limiting operations are switched according to the time that has elapsed since the beginning of the limiting operation as in the second modality, it is preferable that a reference time be reduced to the greater amplitude of the current detected. Thus, the temperatures of chopper circuits 3a and 3b can be adequately controlled. FOURTH MODALITY
[00109] In the fourth mode, a description will be made of an example of a condition in which the operations for limiting chopper circuits 3a and 3b are switched in M2 mode. In the example in Fig. 13, the switching power supply circuit is additionally equipped with two temperature detection units 81 and 82. The temperature detection unit 81 detects the temperature of the chopper circuit 3a, and the temperature detection unit temperature 82 detects the temperature of the chopper circuit 3b.
[00110] Controller 5 is additionally equipped with determination units 83 and 84. Determination unit 83 determines whether the temperature detected by temperature detection unit 81 is greater than a predetermined standard temperature value, and whether a determination positive, the determination unit 83 informs the operation controller 52 accordingly. The determination unit 84 determines whether the temperature detected by the temperature detection unit 72 is greater than the standard temperature value, and if a positive determination is made, the determination unit 84 informs the operating controller 52 accordingly.
[00111] In a condition in which the temperature of the chopper circuit 3a is higher than the standard temperature value, the operation controller 52 suspends the limiting operation of the chopper circuit 3a and causes the chopper circuits 3b to perform the operation of limitation. Additionally, in a condition in which the temperature of the chopper circuit 3b is higher than the standard temperature value, the operation controller 52 suspends the limiting operation of the chopper circuit 3b and causes the chopper circuit 3a to perform the limiting operation. .
[00112] This can precisely maintain the temperatures of chopper circuits 3a and 3b equal to or less than the standard temperature value.
[00113] Additionally, temperature detection units do not need to be supplied depending on the number of chopper circuits 3a and 3b. For example, with respect to the two chopper circuits 3a and 3b, a temperature detection unit can be provided. This temperature detection unit detects an average temperature of the chopper circuits 3a and 3b. Then, in a condition in which the temperature detected by this temperature sensing unit is greater than a second standard temperature value, the operation controller 52 can switch the chopper circuits 3a and 3b limiting operations.
[00114] For example, as illustrated in Fig. 14, together with an increase in temperature Ta of chopper circuit 3a, the temperature T detected by the temperature detection unit increases. Then, when the temperature T detected by the temperature sensing unit exceeds a second standard temperature value Tref, the operation controller 52 suspends the limiting operation of the chopper circuit 3a and causes the chopper circuit 3b to perform the limiting operation. Accordingly, the temperature Ta of the chopper circuit 3a decreases, and the temperature Tb of the chopper circuit 3b increases.
[00115] At that moment, when a rate of reduction of temperature Ta of chopper circuit 3a is greater than the rate of increase of temperature Tb of chopper circuit 3b, the temperature T detected by the temperature detection unit decreases. Then, when the rate of reduction of temperature Ta of the chopper circuit 3a falls below the rate of rise of the temperature Tb of the circuit and cut 3b, the temperature T detected by the temperature detection unit changes upwards. Thereafter, when the temperature T detected by the temperature sensing unit again becomes higher than the second standard temperature value Tref, the operation controller 52 suspends the limiting operation of the chopper circuit 3b and causes the chopper circuit 3a perform the limiting operation.
[00116] At that moment, when the rate of temperature reduction Tb of the chopper circuit 3b is higher than the rate of increase of the temperature Ta of the chopper circuit 3a, the temperature T detected by the temperature detection unit decreases. Then, when the rate of reduction of temperature Tb of the chopper circuit 3b falls below a rate of increase of temperature Ta of the chopper circuit 3a, the temperature T detected by the temperature detection unit changes upwards. Thereafter, when the temperature T detected by the temperature sensing unit becomes again higher than the second standard temperature value Tref, the operation controller 52 again suspends the chopper circuit limiting operation 3a and causes the chopper circuit 3b perform the limiting operation. From now on, the operation described above will be repeated.
[00117] Switching the limiting operation in this way can also control the rise in temperature of chopper circuits 3a and 3b.
[00118] Additionally, as shown in Fig. 15, controller 5 can be equipped with a subtraction unit 85 and a determination unit 86. The subtraction unit 85 calculates an absolute value of the difference between the temperatures detected by the detection units temperature 81 and 82. Determination unit 86 determines whether the absolute value of the difference between temperatures is greater than a predetermined standard temperature difference value and if a positive determination is made, determination unit 86 informs the temperature controller. operation 52 accordingly.
[00119] In a condition where the absolute value of the difference between the temperatures detected by the temperature detection units 81 and 82 is greater than the value of the standard temperature difference, the operation controller 52 switches the circuit limiting operations choppers 3a and 3b. For example, as illustrated in Fig. 16, together with an increase in temperature Ta of chopper circuit 3a, the temperature difference Tab, which is the absolute value of the difference between temperatures Ta and Tb, increases. When the temperature difference Tab becomes greater than the standard temperature difference value Tref1, the limiting operation of the chopper circuit 3a is suspended, and the chopper circuit 3b performs the limiting operation. In association with this, the temperature Ta decreases, and the temperature Tb increases. As a result, the Tab temperature difference decreases. Then, after the temperatures Ta and Tb become equal to each other, and the temperature difference Tab becomes equal to zero, the temperature difference Tab again moves upwards. Then, when the temperature difference Tab becomes again greater than the standard temperature difference value Tref1, the limiting operation of the chopper circuit 3b is suspended, and the chopper circuit 3a performs the limiting operation.
[00120] Thus, the amount of heat created in chopper circuits 3a and 3b can be shared between chopper circuits 3a and 3b in a good balance. As a result, the temperatures of the chopper circuits 3a and 3b can be controlled more adequately and efficiently.
[00121] Additionally, also for the mode controller 51, the temperatures detected by the temperature detection units 81 and 82 can be recorded. Then, when the temperature detected in the M2 mode is less than a third standard temperature value <the standard temperature value, the second standard temperature value, the mode controller 51 can switch the operating mode to M1 mode. This can avoid unnecessary switching of the chopper circuits 3a and 3b limiting operations. FIFTH MODE
[00122] In the fifth mode, a description will be made of an example of a condition in which the operations of limiting the chopper circuits 3a and 3b are switched in M2 mode. In the example in Fig. 17, the switching power supply circuit is equipped with a counter unit 90 and a determination unit 91. The counter unit 90 counts the number of cuts in the limiting operations of the chopper circuits 3a and 3b . In greater detail, for counter unit 90, switching signals for switching elements S1 and S2 are recorded. Then, the counter unit 90 counts the number of records of the switching signals.
[00123] The determination unit 91 determines whether the number of cuts counted by the counter unit 90 is greater than a predetermined standard value of the number, and if a positive determination is made, the determination unit 91 informs the operation controller 52 according.
[00124] When the number of cuts since the beginning of the chopper circuit 3a operation is greater than the standard value of the number, the operation controller 52 suspends the chopper circuit 3a limitation operation and causes the chopper circuit 3b to perform the limiting operation. In addition, counter unit 90 initializes the number of cuts after start of operation of chopper circuit 3b. Then, when the number of cuts from the start of operation of the chopper circuit 3b is greater than the default value of the number, the operation controller 52 suspends the limiting operation of the chopper circuit 3b and causes the chopper circuit 3a to perform the limiting operation. In addition, counter unit 90 initializes the number of cuts after start of operation of chopper circuit 3a.
[00125] This can also control the rise in temperatures of chopper circuits 3a and 3b. In addition, an expensive sensor such as a temperature sensor is not necessary, where the production cost can be reduced.
[00126] Note that the default value of the number is preferably less for the greater amplitude or, for example, the average value or the maximum value of the AC voltage for about a period, this later applies to currents flowing through the circuits choppers 3a and 3b. This is the same as described in the third modality. SIXTH MODE
[00127] In M2 mode, as the condition for switching chopper circuits 3a and 3b, any of the conditions described in the second to fifth modes is used, for example. However, operation controller 52 switches the operations for limiting chopper circuits 3a and 3b in the period to be described in the sixth mode. Below, a detailed description will be made considering, for example, the third modality as an example.
[00128] As exemplified in Fig. 18, the switching power supply circuit is additionally, in comparison with the switching power supply circuit of Fig. 11, equipped with a voltage sensing unit 10, and the controller 5 is additionally equipped with a determination unit 11. The voltage detection unit 10 detects, for example, an AC voltage on the input side of the rectifier circuit 2. The determination unit 11 determines whether the absolute value of the AC voltage is less than a predetermined standard voltage value, and if a positive determination is made, the determination unit 11 reports accordingly.
[00129] In the period when an integration value of the current IL 1 at the start of operation of the chopper circuit 3a is greater than a standard integration value, and the absolute value of the AC voltage is less than the standard voltage value, the operation controller 52 suspends the chopper circuit limiting operation 3a and initiates the chopper circuit limiting operation 3b. Similarly, in the period when an integration value of the IL 2 current at the start of operation of the chopper circuit 3b is greater than the standard integration value and the absolute value of the AC voltage is less than the standard voltage value, the operation controller 52 suspends the chopper circuit 3b limiting operation and starts the chopper circuit 3a limiting operation.
[00130] As the average voltage value, a value close to zero is used, for example. Thus, the operations for limiting chopper circuits 3a and 3b are switched in the period when the AC voltage, in other words, the first DC voltage between the input terminals P1 and P2 is small. As a result, changes in the first DC voltage and AC voltage and the change in input current 1 associated with switching the limiting operations of chopper circuits 3a and 3b can be reduced.
[00131] Note that voltage detection unit 10 can detect the first DC voltage on the output side of rectifier circuit 2. The first DC voltage pulses with a period of N parts of the period of a phase N voltage AC. In addition, the operating controller 52 can switch the chopper circuit limitation operations 3a and 3b when the integrated current value is greater than the standard integration value, and the first DC voltage is less than a second standard voltage value predetermined. This can also reduce variations in the first DC voltage and AC voltage and the variation in input current I associated with switching between chopper circuits 3a and 3b.
[00132] Additionally, as exemplified in Fig. 19, the switching power supply circuit can be additionally, in comparison with the switching power supply circuit of Fig. 11, equipped with a current detection unit 13. The current detection unit 13 detects the AC current at the input side of rectifier circuit 2, for example. Controller 5 is equipped with a determination unit 14. The determination unit 14 determines whether the absolute value of the AC current detected by the current detection unit 13 is less than a predetermined value, and if a positive determination is made, the determination unit 14 informs operation controller 52 accordingly.
[00133] In a period in which the value of the integrated current is greater than the value of standard integration, and the absolute value of AC current is less than a value of standard current, the operation controller 52 switches the limiting operations chopper circuits 3a and 3b. As the standard current value, a value close to zero is used, for example. Thus, the operations for limiting the chopper circuits 3a and 3b are switched in the period when the AC current is low. As a result, the variation in input current I associated with switching between chopper circuits 3a and 3b can be reduced.
[00134] Note that the current detection unit can detect the input current I flowing on the output side of the rectifier circuit 2. For example, the input current I can be detected as a sum of the currents IL 1 and IL 2 detected by current detection units 61 and 62. Then, the determination unit 14 determines whether the input current I is less than a second standard current value, and if a positive determination is made, the determination unit 14 informs operation controller 52 accordingly.
[00135] When the value of the integrated current is greater than the standard integration value and the input current I is less than the second standard current value, the operation controller 52 switches the limiting operations of the chopper circuits 3a and 3b. Thus, the operations for limiting the chopper circuits 3a and 3b are switched in the period when the input current I is low. As a result, the variation in input current I associated with switching between chopper circuits 3a and 3b can be reduced. SEVENTH MODALITY
[00136] In a case in which the AC 1 power source that is connected to the switching power supply circuit is connected to other devices, for example, a TV or an electric lamp, it is not preferable that the voltage variation power supply due to the switching power supply circuit causes oscillation in such devices.
[00137] Fig. 20 is a diagram illustrating a short-time oscillation indicator, and this graph is stipulated in IEC International Electrotechnical Commission 61000-3-3. The horizontal geometric axis represents a number of times of voltage changes per minute, where a stepped voltage change is counted as once, and the vertical geometric axis represents the magnitude of the voltage change allowed to prevent oscillation. This magnitude of voltage change is a magnitude, where a rated voltage is assumed to be 100%. In particular, for example, if 1,000 times of voltage change occurs per minute, the magnitude of that voltage change needs to be less than about 0.27% of the rated voltage.
[00138] Here, since the variation can be created in the power supply voltage due to the switching of the chopper circuits 3a and 3b limiting operations, the switching frequency of the chopper circuits 3a and 3b can be understood in Fig. 20 , such as the number of voltage changes per minute. Thus, it is preferable that the switching frequency is determined, avoiding the region in which the permitted voltage change is relatively small. For example, as the switching frequency, it is preferable to avoid frequencies between 5 Hz and 50 Hz. Thus, the permitted magnitude of voltage change can be greater than 0.5% of the rated voltage. EIGHT MODE
[00139] The switching power supply circuits described in the first to seventh modalities are provided in a heat pump unit, for example. As shown in Fig. 21, in the heat pump unit 100, a refrigeration circuit is configured with a compressor 103 and an expansion valve 104 provided in a tube connecting two heat exchangers 101 and 102. In this refrigeration circuit, the refrigerant is circulated. The compressor 103 comprises the refrigerant, and the expansion valve 104 expands the refrigerant by acceleration. This can facilitate heat exchange in heat exchangers 101 and 102. In this refrigeration circuit, compressor 103 and expansion valve 104 are driven by electrical energy being supplied.
[00140] Additionally, if air-cooled heat exchangers are used as heat exchangers 101 and 102, fans 105 and 106 can be provided to facilitate heat exchange. These fans 105 and 106 are also powered by electricity being supplied.
[00141] In the example in Fig. 21, the switching power supply circuit 110 sends a DC voltage to a drive unit, for example, an inverter 107 to drive compressor 103, for example. Accordingly, a heat pump unit using an efficient switching power supply circuit can be provided. In particular, when the heat pump unit 100 is an air conditioner, the period when the compressor can be turned at low speed is long. This is because after the temperature in an environment is approached to the temperature determined in the neighborhood, it is not necessary to illustrate much of the cooling capacity or heating capacity. When compressor 103 is turned at such a low speed, a current supplied to compressor 103 is relatively low, and thus the switching power supply circuit 110, which can improve efficiency in the region of an electrical energy low, is especially useful.
[00142] Note that the switching power supply circuit 110 can supply a DC voltage to the drive unit for driving expansion valve 104 and fans 105 and 106.
[00143] This invention has been described in detail, however, all of the above descriptions are examples in every aspect, and this invention is not limited to that. It should be understood that countless examples of deformation not illustrated can be conceived without departing from the scope of this invention. NUMERICAL REFERENCES 2 rectifier circuit 3 chopper circuit 11.60 61.62 current detection unit 51 mode controller 52 operation controller 70 period detection unit 81.82 temperature detection unit 90 counter unit D1, D1 diode L1 , L2 reactor LH1, LH2, LL line DC P1, P2 input terminal P3, P4 output terminal S1, S2 switching element

权利要求:
Claims (13)
[0001]
1. Device for controlling a switching power supply circuit, the switching power supply circuit including a pair of input terminals (P1, P2), a pair of output terminals (P3, P4), a first circuit chopper (3a) and a second chopper circuit (3b) which are connected parallel to each other between said pair of input terminals (P1, P2) and said pair of output terminals (P3, P4) and each of which performs a limiting operation, the device comprising: mode controller (51) configured to change an operating mode of said first chopper circuit (3a) and second chopper circuit (3b) from a first mode to a second mode (M3 ) through a third mode (M2) as an electrical energy in said first chopper circuit (3a) and second chopper circuit (3b) increases; and an operation controller (52) characterized by the fact that said operation controller (52) is configured to cause, in a first mode (M1), said first chopper circuit (3a) to constantly perform the limiting operation, and said second chopper circuit (3b) constantly suspends said limiting operation, wherein said operation controller (52) is configured to cause, in said second mode (M3), said first chopper circuit (3a) and said second chopper circuit (3b) constantly performs said limiting operation; said operation controller (52) is configured to cause, in said third mode (M2), said first chopper circuit (3a) and said second chopper circuit (3b) to perform said limiting operation alternately; and said mode controller (51) is configured to change said operating mode of said first chopper circuit (3a) and said second chopper circuit (3b) from said first mode (M1) to said second mode ( M3) through said third mode (M2), as the electrical energy of said first chopper circuit (3a) and said second chopper circuit (3b) increases.
[0002]
2. Device for controlling a switching power supply circuit, according to claim 1, characterized by the fact that a constant voltage source (1) is connected between said pair of input terminals (P1, P2), and the control device further comprises: a current detection unit (60, 61, 62) configured to detect an input current (I) flowing through said pair of input terminals (P1, P2), where said mode (51) is configured to change said operating mode from said first mode (M1) to said second mode (M3) via said third mode (M2) as said input current (1) increases.
[0003]
3. Device for controlling a switching power supply circuit according to claim 1 or 2, characterized by the fact that it additionally comprises: a period detection unit (70) that counts the elapsed time, where said controller operation (52) is configured to switch, in said third mode (M2), said limiting operation of said first chopper circuit (3a) and said second chopper circuit (3b) in a condition that a predetermined period of time has passed from the beginning of said operation of limiting said first chopper circuit (3a) and said second chopper circuit (3b).
[0004]
Device for controlling a switching power supply circuit according to claim 1 or 2, characterized by the fact that it further comprises: a second current detection unit (61) configured to detect a current flowing through said first chopper circuit (3a), where said operation controller (52) is configured to switch, in said third mode (M2), said limiting operation of said first chopper circuit (3a) and said second chopper circuit (3b) under a condition that an integration value of said current from the beginning of said limiting operation of said first chopper circuit (3a) and said second chopper circuit (3b) is greater than a predetermined value.
[0005]
5. Device for controlling a switching power supply circuit according to claim 4, characterized by the fact that said mode controller (51) is configured to change said operation mode to said first mode in a condition that in said third mode (M2), said current is less than a predetermined value.
[0006]
6. Device for controlling a switching power supply circuit according to claim 1 or 2, characterized by the fact that it further comprises: a second current detection unit (61) configured to detect a current flowing through said first chopper circuit (3a), where in said third mode (M2), said operation controller (52) is configured to switch the execution or suspension of said limiting operation of said first chopper circuit (3a) with a short period to measure that said current through said first chopper circuit (3a) is higher.
[0007]
7. Device for controlling a switching power supply circuit according to claim 1 or 2, characterized by the fact that it further comprises: a temperature detection unit (81) configured to detect a temperature of said first chopper circuit ( 3a); where said operation controller (52) is configured to switch, in said third mode (M2), said limiting operation of said first chopper circuit (3a) and said second chopper circuit (3b) in a condition in which a The temperature of said first chopper circuit (3a) and said chopper circuit (3b) is above a predetermined value.
[0008]
8. Device for controlling a switching power supply circuit according to claim 1 or 2, characterized by the fact that it additionally comprises: a first and a second temperature detection unit (81, 82) that detect the temperatures of the said first and second chopper circuits (3a, 3b), respectively; wherein said operation controller (52) is configured to suspend, in said third mode (M2), said limiting operation of said first chopper circuit (3a) in a condition in which a temperature of said first chopper circuit (3a) ) is greater than a temperature of said second chopper circuit (3b) by a value greater than a predetermined value, and to suspend said operation of limiting said second chopper circuit (3b) in a condition in which a temperature of said second chopper circuit (3b) is greater than a temperature of said first chopper circuit (3a) by said value greater than said predetermined value.
[0009]
9. Device for controlling a switching power supply circuit according to claim 7 or 8, characterized by the fact that said mode controller (51) is configured to change said operation mode to said first mode when in said third mode (M2), said temperature being less than a second predetermined value which is less than said predetermined value.
[0010]
10. Device for controlling a switching power supply circuit according to claim 1 or 2, characterized by the fact that it further comprises: a counter unit (90) configured to count a cut-off number for said operation limiting operation said first chopper circuit (3a), wherein said operation controller (52) is configured to switch, in said third mode (M2), said limiting operation of said first chopper circuit (3a) and said second chopper circuit (3b) in a condition in which a number from the beginning of said limiting operation of said first chopper circuit (3a) and said second chopper circuit (3b) is greater than a predetermined value.
[0011]
11. Device for controlling a switching power supply circuit according to any one of claims 1 to 10, characterized by the fact that it further comprises: a rectifier circuit (2) configured to rectify an AC voltage and to apply a voltage DC to said pair of input terminals (P1, P2); and a voltage detection unit (10) configured to detect said AC voltage or said DC voltage, where said operation controller (52) is configured to switch, in said third mode (M2), said limiting operation said first chopper circuit (3a) and said second chopper circuit (3b) in a condition in which a period in which an absolute value of said AC voltage is less than a predetermined value.
[0012]
12. Device for controlling a switching power supply circuit according to any one of claims 1 to 11, characterized by the fact that it further comprises: a rectifier circuit (2) configured to rectify an AC voltage and to apply a voltage DC to said pair of input terminals (P1, P2); and a third current detection unit (13, 60, 61, 62) configured to detect an AC current flowing on one input side of said rectifier circuit (2) or said input current; where said operation controller (52) is configured to start or suspend, in said third mode (M2), said limiting operation of said first chopper circuit (3a) in a period in which an absolute value of said AC current is less than a predetermined value.
[0013]
13. Heat pump unit, comprising: the device for controlling a switching power supply circuit, characterized by the fact that it is defined in any one of claims 1 to 12.

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同族专利:

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公开号 | 公开日

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US9240737B2|2016-01-19|

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ES2795055T3|2020-11-20|

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EP2755310B1|2020-04-08|

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BR112014005225A2|2017-03-21|

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AU2012305574B2|2015-01-22|

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US20140223949A1|2014-08-14|

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CN103782498A|2014-05-07|

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WO2013035534A1|2013-03-14|

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CN103782498B|2015-09-23|

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JP2013059228A|2013-03-28|

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AU2012305574A1|2014-03-13|

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EP2755310A4|2015-08-12|

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EP2755310A1|2014-07-16|

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JP5780074B2|2015-09-16|

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法律状态:
2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-10-01| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-07-21| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2020-10-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-12-15| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 22/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2011196874A|JP5780074B2|2011-09-09|2011-09-09|Switching power supply circuit control device and heat pump unit|

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JP2011-196874|2011-09-09|

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PCT/JP2012/071190|WO2013035534A1|2011-09-09|2012-08-22|Control device for switching power supply circuit, and heat pump unit|

---