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    • 专利摘要:
    POWER FACTOR CORRECTION WITH VARIABLE BUS VOLTAGE.The present invention relates to a controller that includes a voltage determination module, a bus voltage control module, and a power factor correction (PFC) control module. The voltage determination module determines a desired DC voltage from a DC link to an electrically connected DC link between a PFC module and a power inverter module that drives a motor-compressor. The flight determination module determines the desired DC voltage of the bus based on at least one of the motor-compressor torque, motor-compressor speed, output power of the power inverter module and the drive power input. The bus voltage command module determines a controlled bus voltage based on the desired DC bus voltage. The PFC control module controls the PFC module to create a voltage on the DC bus that is based on the commanded bus voltage.
    公开号:BR112012003134A2
    申请号:R112012003134-1
    申请日:2010-08-10
    公开日:2020-08-11
    发明作者:Joseph G. Marcinkiewicz；James L. Skinner；Charles E. Green；John P. Powers
    申请人:Emerson Climate Technologies, Inc.；
    IPC主号:
    专利说明:

    =
    Patent Specification Report for "POWER FACTOR CORRECTION WITH VARIABLE BUS VOLTAGE". Cross reference to Related Orders This Order claims priority for US Utility Order number 12 / 852,557, filed on August 9, 2010, and US Provisional Order number 61 / 232,754, filed on August 10, 2009. Disclosures Compoundations of the Orders above are hereby incorporated by reference.
    Field The present invention relates to electric motor control systems and methods and, more particularly, to power factor correction systems and methods.
    Background The fundamental description provided here is for the purpose of generally presenting the context of the disclosure.
    Work of the inventors currently named in the extension that is described in this section of the plea, as well as aspects of the description that may not otherwise qualify as a precedent technique at the time of filing, are not admitted either expressly or implicitly as a preceding technique against this disclosure.
    Electric motors are used in a wide variety of industrial and residential applications that include, but are not limited to heating, ventilation and air conditioning (HVAC) systems. For example only, an electric motor can drive a compressor in an HVAC system.
    One or more additional electric motors can also be implemented in the HVAC system.
    For example, only the HVAC system can include another electric motor that drives a fan associated with a condenser.
    Another electric motor can be included in the HVAC system to drive a fan associated with an evaporator.
    Power factor is an indicator of the relationship between current and voltage in a circuit, or how effectively a circuit uses actual power compared to storage and power return to the power source.
    The power factor can be expressed by a value between zero and one.
    The use of actual actual power circuit divided by the total voltage ampere brought by the circuit may increase when the power factor approaches 5.
    In several implementations, a PFC power factor correction system can be implemented.
    PFC systems generally operate to increase a circuit power factor in the direction of one, thereby increasing the utilization of the real power circuit when compared to the amount of reactive power that the circuit stores and takes back to the source.
    Summary A system includes a PFC power factor correction module, a power inversion module and a controller.
    The PFC module converts incoming AC power to DC power.
    The power inversion module converts DC power to three-phase AC power and starts a compressor engine using three-phase AC power.
    The controller includes a voltage determination module, a voltage command module, a rate limiting module and a PFC control module.
    The voltage determination module determines a desired voltage for DC power based on at least one of a plurality of system parameters.
    The voltage control module generates a voltage command based on the desired voltage.
    The voltage command module adjusts the commanded voltage equal to a starting voltage for a predetermined starting period after the controller is energized.
    After the predetermined start-up period, the return control module performs three functions.
    First, the voltage command module increases the commanded voltage to the desired voltage when the desired voltage is greater than the commanded voltage.
    Second, the voltage command module increases the commanded voltage to a first threshold voltage when the first threshold voltage is greater than the commanded voltage.
    The first voltage limited
    air is based on a sum of a predetermined positive displaced voltage and a measured peak voltage of the incoming AC power.
    Third, the voltage command module selectively decreases the command voltage to a higher of a second threshold voltage and the desired voltage 5, after a predetermined period has elapsed, in which the command voltage has not been increased.
    The second threshold voltage is based on a sum of the displaced voltage and a higher value of the measured peak voltage of the incoming AC power, observed throughout the predetermined period.
    The rate limiting module generates a limited command voltage by limiting a rate of change of the command voltage.
    When the controller is energized, the rate limiting module initializes the limited commanded voltage for a measured DC power voltage.
    The PFC control module controls the PFC module to produce the DC power in the limited commanded voltage.
    In other aspects, the system also includes the compressor.
    The plurality of system parameters include motor torque, motor speed, output power of the power inverter module, and drive input power.
    A controller includes a voltage determination module, a bus voltage control module, and a PFC power factor correction control module.
    The voltage determination module determines a desired direct current (DC) bus voltage for an electrically connected DC bus between a PFC module and a power inverter module that drives a motor-compressor.
    The voltage determination module determines the desired DC bus voltage based on at least one of the motor-compressor torque, motor-compressor speed, output power of the power inverter module and drive input power.
    The bus voltage control module determines a controlled bus voltage based on the desired DC bus voltage.
    The PFC control module controls the PFC module to create a voltage on the DC bus that is based on the commanded bus voltage.
    In other respects, the bus voltage control module adjusts the commanded bus voltage equal to a measured DC bus voltage when the controller transitions from an off state to an on state. 5 In additional aspects, the controller also includes a rate limiting module that generates a rate limited voltage.
    The PFC control module controls the PFC module to create the rate-limited vofting on the DC bus.
    The rate-limited voltage is equal to the measured voltage of the DC bus when the controller transitions from the off state to the on state.
    After the controller transacts from the off state to the on state, the bus voltage control module adjusts the commanded bus voltage equal to a predetermined start voltage for a predetermined start period, and the module rate limiting slope the rate limited voltage in the direction of the commanded bus voltage during the predetermined start-up period.
    In still other aspects, the bus voltage control module increases the commanded bus voltage to a higher of the desired DC bus voltage and a first sum, when the commanded bus voltage is lower than any of the bus voltage Desired CC or the first sum.
    The first sum is equal to a predetermined displacement plus a peak voltage of an AC line that powers the PFC module.
    In other respects, the bus voltage control module decreases the commanded bus voltage to a greater extent within the desired DC bus voltage and a second sum after a predetermined period, in which the commanded bus voltage does not. has been increased.
    The second sum is equal to the predetermined displacement plus the highest value of the peak voltage observed during the predetermined period.
    In other respects, a system includes the controller, the PFC module, the power inverter module, and a capacitor inverter module m that drives a condenser fan using energy from the DC bus.
    A system includes the controller, the PFC module, the power inverter module, a condenser inverter module that drives a condenser fan that uses energy from a second DC bus and an electrical connection between the dc bus and the second dc bus that provides excess energy from the dc bus to the second dc bus.
    One method includes converting incoming AC power to DC power using a PFC power factor correction module; converting DC power to AC power using a power inverter module; start a compressor engine using AC power; determine a desired voltage for DC power based on at least one of the motor torque, motor speed, output power of the power inverter module, and drive input power; and generate (a voltage controlled based on the desired voltage, and control the PFC module to produce DC power at a voltage based on the voltage controlled.
    In other aspects, the method also includes adjusting the commanded voltage equal to a starting voltage for a predetermined starting period, when energizing. In other aspects the method also includes generating a limited commanded voltage, limiting a rate of change of the coman voltage. - given; control the PFC module to produce the DC power at the limited command voltage; and at the beginning of the predetermined starting period, start the limited commanded voltage up to a measured voltage of the DC power.
    In still other aspects, the method also includes keeping the voltage controlled to be greater than or equal to the desired voltage.
    The method further includes determining a threshold voltage based on a sum of a predetermined positive displaced voltage, and a measured peak voltage of the incoming AC power; and maintaining the commanded voltage to be greater than or equal to the threshold voltage.
    m
    In other aspects, the method also includes increasing the commanded voltage to the desired voltage when the desired voltage is greater than the commanded voltage; and increasing the commanded voltage to a first threshold voltage when the first threshold voltage is greater than the commanded voltage.
    The first threshold voltage is based on a sum of a predetermined positive displaced voltage and a measured peak voltage of the incoming AC power.
    In other aspects, the method also includes selectively decreasing the commanded voltage to a higher of a second threshold voltage and the desired voltage after a predetermined period has elapsed, in which the commanded voltage has not been increased.
    The second threshold voltage is based on a sum of the displaced voltage and the highest value of the measured peak voltage of the incoming AC power, observed throughout the predetermined period.
    Other areas of applicability of the present disclosure will become evident from the detailed description provided hereinafter.
    It should be understood that the detailed description and specific examples are designed for illustration purposes only, and are not intended to limit the scope of the disclosure.
    Brief description of the drawings The present disclosure will become more fully understood from the detailed description of the accompanying drawings, in which: Figure 1 is a functional block diagram of an example of a cooling system; Figure 2 is a functional block diagram of an example of a drive controller for an example of a compressor; Figures 3a - 3c are simplified schematic examples of PFC power factor correction modules; Figures 4a - 4c are simplified diagrams of examples of power inverter modules and example of motors; Figure 5 is a functional block diagram of an example of the implementation of a common DC direct current bus cooling system; Figure 6 is a functional block diagram of another example of the implementation of a common DC bus cooling system; Figure 7 is a functional block diagram of an example of a bus voltage determination module; e Figure 8 is an example method flowchart for determining the DC bus voltage.
    Detailed description The following description is merely illustrative in nature, and is in no way designed to limit disclosure, its application or uses.
    For the sake of clarity, the same reference numbers will be used in the drawings to identify similar elements.
    As used here, the phrase "at least one of A, B and C" should be constructed to mean a logic (A or B or C) using an Iogic "or" non-exclusive.
    It should be understood that steps within a method can be performed in a different order, without changing the principles of this disclosure.
    As used herein, the term "module" may refer to, be part of, or include an Integrated Application Specific Circuit (ASlC): an electronic circuit, a combination logic circuit, a programmable field gate system (FPGA) ; a processor (shared, dedicated, or group) that executes code; other suitable components that provide the described functionality, or a combination of some or all of the above, such as in a "chip" system. The term "module" can include memory (shared, dedicated or group) that stores code executed by the processor.
    The term "code" as used above, can include software, firmware, and / or microcode, and can refer to programs, routines, functions, classes, and / or objects. the term "shared" as used above, means that some or all of the code from different modules can be used using a single (shared) processor. In addition, some or all codes of different modules can be stored by a single shared memory.
    The term "group" as used above, means that some or all of the code from a single module can be executed using a group of processors.
    In addition, some or all of the codes from a single module can be stored using a memory group.
    The devices and methods described here can be implemented by one or more switch programs executed by one or more processors.
    The switch programs include executable instructions per processor, which are stored in a switch-readable, tangible non-transitory medium.
    Switch programs can also include stored data.
    Non-limiting examples of medium readable by a non-transitory tangible switch are non-volatile memory, magnetic storage, and optical storage.
    Referring now to Figure 1, a functional block diagram of a cooling system 100 is presented.
    The cooling system 100 can include a compressor 102, a condenser 104, an expansion valve 106 and an evaporator 108. In accordance with the principles of the present disclosure, the cooling system 100 can include additional and / or alternative components.
    In addition, the present disclosure is applicable to other suitable types of refrigeration systems which include, but are not limited to, heating, ventilation and air conditioning (HVAC) systems, heat pumps, refrigeration and freezers.
    Compressor 102 receives refrigerant in the form of steam and compresses the refrigerant.
    Compressor 102 delivers pressurized refrigerant in the form of steam to condenser 104. Compressor 102 includes an electric motor that drives a pump.
    For example only, the compressor pump 102 may include a roller compressor and / or an alternate compressor. All or a portion of the pressurized refrigerant is converted to liquid form within condenser 104. Condenser 104 transfers heat away from the refrigerant by cooling with this the soda.
    When the refrigerant vapor is cooled to a temperature that is less than a saturation temperature, the refrigerant becomes a liquid (or liquefied) refrigerant. Condenser 104 may include an electric fan that increases the rate of heat transfer away from the refrigerant.
    Compensator 104 supplies refrigerant to evaporator 108 through expansion valve 106. Expansion valve 106 controls the flow at which refrigerant is supplied to evaporator 108. Expansion valve 106 can include a thermostatic expansion, or can be controlled electronically using, for example, a system controller 130. A pressure drop caused by expansion valve 106 can cause a portion of the liquefied refrigerant to change back to the steam form.
    In this way the evaporator 108 can receive a mixture of refrigerant vapor and liquefied refrigerant.
    The refrigerant absorbs heat in evaporator 108. Liquid refrigerant transitions to steam when heated to a temperature that is higher than the saturation temperature of the refrigerant.
    Evaporator 108 may include an electric fan that increases the rate of heat transfer to the refrigerant.
    A utility 120 provides power to the cooling system 100. For example only, utility 120 can provide AC single phase AC power at approximately 230 volts N) square root mean (RMS) or at another suitable voltage.
    In several implementations the utility 120 can supply three-phase power at approximately 400 volts RMS or 480 volts RMS at a line frequency of, for example, 50 or 60 Hz.
    Utility 120 can supply AC power to system controller 130 over an AC line.
    AC power can also be supplied to a drive controller 132 via the AC line.
    System controller 130 controls cooling system 100. For example only, system controller 130 can control cooling system 100 based on user input and / or parameters.
    meters measured by the various sensors (not shown). The sensors may include pressure sensors, temperature sensors, current sensors, voltage sensors, etc.
    The sensors can also include feedback information from the drive control, such as currents or motor torque over a serial data bus or other suitable data buses.
    A user interface 134 provides user inputs for system controller 130. User interface 134 can provide, additionally or alternatively, user inputs for drive controller 132. User inputs can include, for example , a desired temperature, requests regarding the operation of a fan, for example, the evaporator fan, and / or other suitable inlets.
    System controller 130 can control the operation of condenser fans 104 from evaporator 108 and / or expansion valve 106. Drive controller 132 can control compressor 102 based on commands from the system controller 130. For example only, system controller 130 can instruct drive controller 132 to operate the compressor motor at a certain speed.
    In various implementations the drive controller 132 can also control the condenser fan.
    Referring now to figure 2, a functional block diagram of drive controller 132 and compressor 102 is shown.
    An electromagnetic interference (EMI) filter 202 reduces EMI that might otherwise be injected back into the AC line by the drive controller 132. The EMI filter 202 can also filter EMI charged on the AC line.
    A PFC 204 power factor correction module receives AC power from the AC line as filtered by the EMI 202 filter. The PFC 204 module (described in more detail with reference to figures 3a, 3b and 3c) rectifies the AC power, converting with this the input power AC into DC direct power.
    The generated DC power is supplied in positive and negative terminals of the PFC 204 module. The PFC 204 module is also
    It also selectively provides power factor correction based on the input AC power and the DC power generated. The PFC module selectively boosts AC power to a DC voltage that is greater than a peak voltage of 5 AC power. For example only, the PFC 204 module can operate in a passive mode where the generated DC voltage is less than a peak voltage of the AC power. The PFC 204 module can also operate in active mode, where the DC voltage generated is greater than the peak voltage of the AC power. A DC voltage that is greater than the peak voltage of the AC power can be referred to as an enhanced DC voltage. An AC power having an RMS voltage of 230 V has a peak voltage of approximately 325 V (230 V multiplied by the square root of 2). For example only, when operating from AC power that has an RMS voltage of 230 V the PFC 204 module can generate reinforced DC voltages between approximately 350 V and approximately 410 V. For example only, the lower limit of 350 V can be imposed to avoid unstable operating regimes of the PFC 204 module. The limits may vary as with the actual AC input voltage value. In several implementations the PFC 204 module may be able to achieve reinforced DC voltages higher than 410 V. However, the upper limit can be imposed to improve the long-term reliability of components that could experience higher voltage at higher voltages. , such as components in a 206 CC filter. In many implementations the upper and / or lower limits can be varied. The DC filter 206 filters the DC power generated by the PFC module
    204. The DC 206 filter minimizes wave voltage present in the DC power that results from converting AC power to DC power. In several implementations the CC 206 filter can include one or more series of parallel filter capacitors connected between the positive and negative terminals of the PFC 204 module. In such implementations the positive and negative terminals of the PFC 204 module can be connected directly to terminals positive and negative of a 208 power inverter module.
    The power inverter module 208 (described in more detail with reference to figures 4a, 4b and 4c) converts the DC power as filtered by the DC filter 206 to AC power that is supplied to the motor-compressor. For example only, the 208 power inverter module can convert the DC power to three-phase AC power and supply the phases of the AC power to three respective windings of the compressor motor
    102. In other implementations, the 208 power inverter module can convert DC power to more or less power phases. A CC-CC 220 power supply can also receive filtered DC power. The DC-DC 220 power supply converts the DC power to one or more DC voltages that are suitable for various components and functions. For example only, the DC-220 power supply can reduce the DC power voltage to a first DC voltage that is suitable for energizing digital logic, and a second DC voltage that is suitable for controlling switches within the PFC module. 204. For example only, the second DC voltage can be selectively applied to switch terminals. In several implementations DC power can be supplied by another DC power source (not shown), for example, a DC voltage derived through a transformer from the 230 VAC main input. In several implementations, the first DC voltage can be approximately 3.3 V, the second DC voltage can be approximately 15 V. In several implementations the DC-DC 220 power supply can also generate a third DC voltage. For example only, the third DC voltage can be approximately 1.2 V. The third DC voltage can be derived from the first DC voltage using a voltage regulator. For example only, the third DC voltage can be used for digital core logic, and the first DC voltage can be used for input circuits output from a PFC 250 control module and a 260 motor control module. The PFC 250 control module controls the PFC 204 module and the motor control module 260 controls the power inverter module
    208. In several implementations the PFC 250 control module controls switching of the switches within the PFC 204 module and the motor control module 260 controls switching within the power inverter module 208. The PFC 204 module can be implemented with 1, 5 2, 3 or more phases. A supervisor control module 270 can communicate with system controller 130 via a communications module 272. Communications module 272 can include an input / output port and other suitable components, to serve as an interface between the controller lThe system controller 130 and the supervisor control module 270. The communications module 272 can implement wired and / or wireless protocols. The supervisor control module 270 provides several commands for the PFC 250 control module and the motor control module
    260. For example, the supervisor control module 270 can provide a controlled speed for the motor control module 260. The controlled speed corresponds to a desired speed of the compressor motor 102. In several implementations the compressor speed command can be provided for the supervisor control module 270 by system controller 130. In several implementations the supervisor control module 270 can determine or adjust the commanded compressor speed based on inputs provided through the control module. communications 272 and parameters measured by the different sensors, that is, sensor inputs. The supervisor control module 270 can also adjust the compressor speed commanded based on feedback from the PFC 250 control module and / or the motor control module 260. The supervisor control module 270 can also provide other commands for the PFC 250 control module and / or motor control module 260. For example, based on the commanded speed, the supervisor control module 270 can command a PFC 250 control module to produce a commanded bus voltage. The supervisor control module 270 can adjust the bus voltage
    given based on additional inputs, such as operating parameters of the 208 power inverter module and the measured voltage of the incoming AC line.
    The supervisor control module 270 can diagnose faults 5 in several drive controller systems 132. For example only, the supervisor control module 270 can receive fault information from the PFC 250 control module and / or from the control module motor 260. The supervisor control module 270 can also receive fault information via the communication module 272. The supervisor control module 270 can manage, report and clear faults between drive controller 132 and the system controller 130. Responding to the fault information, the supervisor control module 270 can instruct the PFC control module 250 and / or the motor control module 260 to enter a fault mode.
    For example only, in failure mode, the PFC 250 control module can interrupt switching of the PFC 204 module switches, while the motor control module 260 can interrupt switching of the power inverter module 208 switches. In addition, the motor control module 260 can directly provide fault information to the control module PFC 250. In this way, the control module PFC 250 can respond to a fault identified by the motor control module 260, even if the supervisor control module 270 is not operating correctly, and vice versa.
    The PFC 250 control module can control switches in the PFC 204 module using pulse width modulations (PWM). More specifically, the PFC 250 control module can generate PWM signals that are applied to the switches of the PFC 204 module. The duty cycle of the PWM signals is varied to produce desired currents in the switches of the PFC 204 module. The desired currents are calculated based on in an error between the measured DC bus voltage and a desired DC bus voltage.
    In other words, the desired currents are calculated to achieve the desired DC bus voltage.
    The desired currents can also be based on achieving desired power factor correction parameters, such as the current waveform shapes on the PFC 204 module. The PWM signals generated by the PFC 250 control module can be referred to as signals PFC PWM. 5 The motor control module 260 can control switches in the power inverter module 208 using PWM to achieve the commanded compressor speed. The PWM signals generated by the motor control module 260 can be referred to as PWM signals from the drive. The duty cycle of the PWM signals from the inverter controls the current through the motor windings, that is, compressor 102 motor currents. The motor torque controls the motor currents and the motor control module 260 can control the motor torque. to achieve the desired compressor speed. In addition to sharing fault information, the PFC 250 control module and the 260 motor control module can also share data. For example only, the PFC 250 control module can receive data from the motor control module 260 such as load, motor currents, estimated motor torque, inverter temperature, PWM signals of the inverter duty cycle, and others appropriate parameters. The PFC 250 control module can also receive data from the motor control module 260 such as the measured DC bus voltage. The motor control module 260 can receive data from the PFC control module 250 such as AC line voltage, currents through the PFC 204 module, estimated AC power, PFC temperature, commanded bus voltage, and other suitable parameters. In several implementations, some or all of the PFC 250 control module, motor control module 260, and supervisor control module 270, can be implemented in an integrated circuit (IC)
    280. For example only, the lC 280 can include a digital signal processor (DSP), a programmable field gate system (FPGA), a microprocessor, etc. In several implementations, additional components can be included in the LC 280. In addition, several functions shown
    inside the IC 280 in figure 2 can be implemented external to the LC 280, such as in a second LC or in discrete circuits. For example only, the supervisor control module 270 can be integrated with the motor control module 260- Figure 3a is a schematic of an example of the implementation of the PFC 204 module. The PFC 204 module receives AC power through the first and second AC input terminals 302 and 304. The power if it can be, for example, the AC power output through the EMI filter 202. In several implementations the signals on the first and second AC input terminals 302 and 304 can be both time-varying with respect to a ground ground - The PFC 204 module outputs the DC power to the DC filter 206 and the power inverter module 208 via a positive DC terminal 306 and a negative DC terminal 308. An anode a first rectifier diode 310 is connected to the second AC input terminal 304, and a cathode from the first rectifier diode 310 is connected to positive DC terminal 306. An anode of a second rectifier diode 312 is connected to negative DC terminal 308, and a catod that of the second rectifier diode 312 is connected to a second AC input terminal 304. Each of the rectifier diodes 310 and 312 can be implemented as one or more individual series or parallel diodes.
    A switch block 320 is connected between the positive and negative DC terminals 306 and 308. The switch block 320 includes a first leg PFC 330 that includes first and second switches 332 and 334. Switches 332 and 334 each include a first terminal , a second terminal and a control terminal, in several implementations, each of the switches 332 and 334 can be implemented as an isolated gate bi-polar transistor (IGBT). In such implementations, the first, the second, and the control terminals, can correspond to collector, emitter, and gate terminals, respectively. The first terminal of the first switch 332 is connected to the positive DC terminal 306. The second terminal of the first switch 332 is connected to the first terminal of the second switch 334. The second terminal of the second switch 334 can be connected to the negative DC terminal. 308. In several implementations the second terminal of the second switch 334 can be connected to the negative DC terminal 308 via a 5 shunt resistor 380 to allow measuring current flowing through the first leg PFC 330. The control terminals of the switches 332 and 334 generally receive generally complementary PFC PWM signals from the PFC 250 control module. In other words, the PFC PWM signal provided to the first switch 332 is opposite in polarity to the PFC PWM signal provided to the second switch 334. Short-circuit current can drain when the connection of one of the switches 332 and 334 overlaps with the disconnection of the other of the switches 332 and 334 Therefore, both switches 332 and 334 can be turned off for a dead time before any of the switches 332 and 334 are turned on. Therefore, generically complementary means that two signs are opposite for most of their periods. However, around transitions, both signals may be low or high for some period of overlap. The first PFC 330 leg can also include first and second diodes 336 and 338 connected antiparallel to switches 332 and 334, respectively. In other words, an anode of the first diode 336 is connected to the second terminal of the first switch 332 and a cathode of the first diode 336 is connected to the first terminal of the first switch
    332. An anode of the second diode 338 is connected to the second terminal of the second switch 334 and a cathode of the second diode 338 is connected to the first terminal of the second switch 334. The switch block 320 may include one or more additional PFC legs. In several implementations the switch block 320 may include an additional PFC leg. As shown in figure 3a, switch block 320 includes second and third legs PFC 350 and 360. The number of PFC legs included in switch block 320 can be chosen based on performance and cost. For example only, the magnitude of the ripple
    current) at the DC output of the PFC 204 module may decrease when the number of PFC legs increases.
    In addition, the amount of current ripple in the AC line current may decrease as the number of PFC legs increases.
    However, part costs and implementation complexity 5 can increase when the number of PFC legs increases.
    The second and third legs PFC 350 and 360 of switch block 320 can be similar to the first leg PFC 330. For example, only the second and third legs PFC 350 and 360 can each include respective components for the switches. 332 and 334, diodes 336 and 338 and respective shunt resistors connected in the same manner as in the first PFC leg 330. The PFC PWM signals provided for the switches of the additional PFC legs can also be complementary in nature.
    The PFC PWM signals provided for the additional PFC legs can be phase shifted from one another and the PFC PWM signals provided for the first PFC 330 leg. For example only, the phase shift of the PFC PWM signals can be determined by dividing 360 ° by the number of legs PFC.
    For example, when switch block 320 includes three PFC legs, the PWM signals from the PFC can be shifted in phase from each other by 120 ° (or 180 ° for two phases, or 90 "for four phases, etc.). phase the PWM signals from the PFC can cancel out ripple in the AC line current as well as the DC output.
    The PFC 204 module includes a first inductor 370. The first inductor 370 is connected between the first AC 302 input terminal and the second terminal of the first switch 332. Additional inductors can connect the first AC 302 input terminal to legs Additional PFCs.
    For example only, figure 3a shows a second inductor 372 and a third inductor 374 connecting the first AC input terminal 302 to the second and third legs PFC 350 and 360, respectively.
    A voltage can be measured through the shunt resistor 380 to determine current through the first leg PFC 330 in accordance with Ohm's law.
    An amplifier (not shown), such as an amplifier
    operation, you can amplify the voltage through the shunt resistor 380. The amplified voltage can be digitized, accumulated and / or filtered to determine the current through the first PFC 330 leg. Current through other PFC legs can be determined using respective shunt resistors. Additionally or alternatively, a resistor 382 can be connected in series with the negative DC terminal 308 as shown in figure 3b.
    Current through resistor 382 can therefore indicate a total current output from the PFC 204 module. The current through each of the PFC legs 330, 350 and 360 can be inferred from the total current, based on the time delay. known phase of the current through legs PFC 330, 350 and 360. Any method of measuring or sensing current through any or all legs PFC 330, 350, 360 can be used.
    For example, in several implementations the current through the first leg PFC 330 can be measured using a current sensor 387 (as shown in figure 3c). For example only, the current sensor 387 can be implemented in series with the first inductor 370. In several implementations the current sensor 387 can include a Hall effect sensor that measures the current through the first leg PFC 330 based on magnetic flux around the first inductor 370. Current through the PFC legs 350 and 360 can also be measured using associated current sensors 388 and 389, respectively.
    The PFC 204 module can also include first and second contour diodes 390, 392. An anode of the first contour diode 390 'is connected to the first input terminal AC 302 and a cathode of the first contour diode 390 is connected to the positive DC terminal 306. An anode of the second contour diode 392 is connected to the negative DC terminal 308 and a cathode of the second contour diode 392 is connected to the first AC input terminal 302. Contour diodes 390 and 392 can be power diodes that can be designed to operate at low frequencies such as,
    for example, frequencies lower than approximately 100 Hz or approximately 200 Hz.
    Resistance of contour diodes 390, 392 may be less than the resistance of inductors 370, 372 and 374. Therefore, when switches 332 and 334 within switch block 320 are not being switched, current can flow through the contour diodes 390 and 392 instead of diodes 336 and 338. When the PFC 204 module is operating to create an enhanced DC voltage, the enhanced DC voltage will be greater than a peak voltage on the AC line.
    Contour diodes 390 and 392 will therefore not be moved forward and will remain inactive.
    The contour diodes 390, 392 can provide protection against sparking and protection against power ripple.
    In various implementations the contour diodes 390, 392 can be implemented with the rectifier diodes 310 and 312 in a single package.
    For example only, the Vishay model number 26MT or 36MT or the International Rectifier model number 26MB or 36 MB can be used as the contour diodes 390, 392 and the rectifier diodes 310 and 312. The rectifier diodes 310 and 312 carry current if the module PFC 204 is generating an enhanced DC voltage or not.
    Therefore, in several implementations, each of the rectifier diodes 310 and 312 can be implemented as two physical diodes connected in parallel, Current sensors can be used to measure PFC phase currents in series with inductors 370, 372 and 374 Referring now to Figure 4a, a simplified schematic of an engine 400 and an example of the implementation of the 208 power inverter module are presented.
    Motor 400 is a component of compressor 102 of figure 2. However, the principles in figures 4a - 4c can apply to other motors, including a capacitor motor 104. The power inverter module 208 includes a switch block 402. In several implementations the switch block 402 and the switch block 320 of the PFC 204 module can be implemented using a similar part.
    For example only, in figure 4a a first inverter leg 410 includes first
    ro and second switches 420 and 422 and first and second diodes 424 and 426 which are arranged similarly to switches 332 and 334 and diodes 336 and 338 of figure 3a.
    The switch block 402 receives the filtered DC voltage from the DC filter 206 through a positive DC terminal 404 and a negative DC terminal 406. The first terminal of the first switch 420 can be connected to the positive DC terminal 404, while the second terminal of second switch 422 can be connected to negative DC terminal 406. The control terminals of switches 420 and 422 receive generally complementary PWM signals from the inverter from motor control module 260. Switch block 402 may include one or more additional inverted legs.
    In various implementations, switch block 402 may include an inverter leg for each phase or winding of motor 400. For example only, switch block 402 may include second and third inverters 430, 440 as shown in figure 4a.
    Reversing legs 410, 430 and 440 can supply chain for windings 450, 452 and 454 of motor 400, respectively.
    Windings 454, 452 and 450 can be referred to as windings a, b and c, respectively.
    Voltage applied to windings 454, 452 and 450 can be referred to as Va, Vb and Vc, respectively.
    Current through windings 454, 452 and 450 can be referred to as la, lb and lc, respectively.
    For example, only the first ends of the windings 450, 452 and 454 can be connected to a common node.
    Second ends of the windings 450, 452 and 454 can be connected to the second end of the first switch 420 of the inverter legs 410, 430 and 440, respectively.
    The power inverter module 208 may also include a "shunt" resistor 460 which is associated with the first inverter leg 410. The "shunt" resistor 460 can be connected between the second terminal of the second switch 422 and the DC terminal. negative 406. In various implementations respective shunt resistors can be located between each of the inverter legs 430 and 440 and the negative DC terminal 406. For example only, current through the first winding 450 of the motor 400 can be determined based on voltage through the shunt resistor 460 of the first inverter leg 410. In several implementations the resistor 5 "shunt" of one of the inverter legs 410, 430 or 440 can be omitted.
    In such implementations, current can be inferred based on the measurements of the remaining shunt resistors.
    Additionally or alternatively, a resistor 462 can be connected in series with the negative DC terminal 406, as shown in Figure 4b.
    Current through resistor 462 can therefore indicate a total current consumed by the 208 power inverter module. Current through each of the inverter legs 410, 430 and 440 can be inferred from the total current based on the timing of known phase of the current through the inverter legs 410, 430 and 440. Further discussion of determining currents in an inverter can be found in Common Consignment US Patent number 7,193,388, issued on March 20, 2007, which is here hereby incorporated for reference in its entirety.
    Any method of measuring or sensing current through any or all of the 410, 430 and 440 inverter legs can be used.
    For example, in several implementations the current through the first inverter leg 410 can be measured using a current sensor 487 shown in figure 4c.
    For example only, the current sensor 487 can be implemented between the first inverter leg 410 and the first winding 450. Current through the inverter legs 430 and 440 can also be measured using associated current sensors 488 and 489, respectively.
    In several implementations, current sensors can be associated with two of the inverter legs 410, 430 and 440. The current through the other of the inverter legs 410, 430 and 440 can be determined based on an assumption that the current in the windings of zero sum engine.
    Referring now to figure 5, a diagram of an example of the implementation of a common DC bus cooling system 500 is presented. In some implementations the DC power from the PFC 204 module can also be supplied to the capacitor
    104. In several implementations the DC power can be filtered through the DC filter 206. Here, the DC bus from the DC filter 206 is explicitly shown to include a positive DC line 502 and a negative DC line 504. Second positive DC lines and negative 506 and 508 are connected between DC lines 502 and 504, respectively, and a capacitor inverter module 510. The capacitor inverter module 510 converts the DC power to AC power that is supplied to the motor associated with the condenser 104, for example, the condenser fan motor. The condenser fan motor can be referred to as the condenser motor. In several implementations, the 510 capacitor inverter module can convert DC power to three-phase AC power and supply the three phases of AC power to three respective windings of the condenser motor. The inverter module of capacitor 510 can convert DC power to more or less power phases. In several implementations the compensator inverter module 510 can be similar or identical to the power inverter module 208. A capacitor motor control module 530 controls the capacitor inverter module 510. More specifically, the capacitor motor control module 530 controls the flow of power to the condenser motor- The 530 capacitor motor control module can control switches on the 510 inverter module using PWM to achieve a commanded condenser speed. The duty cycle of the PWM signals applied to the 510 inverter module controls current through the capacitor motor windings. The currents control torque and the 530 condenser motor control module can control the torque to achieve the commanded condenser speed. When the capacitor inverter module 510 brings DC power from the DC bus, the PFC 250 control module can control the PWM signals from the PFC to take into account the operation.
    the condenser inverter module 510 and the condenser motor. The 530 capacitor motor control module can be implemented independently of the lC 280 or can be implemented with components of the IC 280 in a common lC, such as within an lC 550 compressor / condenser. In several implementations the compensator motor control module 530 can receive the commanded condenser speed from supervisor control module 270 or from system controller 130. In several implementations the commanded condenser speed can be provided via the control interface user 134 in figure 1. Figure 6 is a diagram of an example of a common DC bus cooling system 600. Compared with the common DC bus cooling system 500 of figure 5, the cooling system 600 includes a capacitor rectifier module 602. The capacitor rectifier module 602 receives AC power as through the line output AC from the EMI filter 202. The capacitor rectifier module 602 rectifies the AC power, thereby converting the AC power to a second DC power. The capacitor rectifier module 602 can include a full bridge rectifier and can include circuits to provide passive or active power factor correction. In several implementations, the condenser rectifier module 602 can be similar or identical to the PFC module
    204. A capacitor rectifier control module 604 can be provided to control the capacitor rectifier module 602. The capacitor rectifier module 602 provides the second DC power for a capacitor inverter module 610 via positive and negative DC lines. - va 612 and 614. The capacitor inverter module 610 converts the second DC power to AC power that is supplied to the condenser motor. A first connection line 615 connects the positive DC line 502 with the positive DC line 612. A second connection line 616 connects the negative DC line 504 with the negative DC line 614.
    A diode 618 can be included in series with the first connection line 615 to block current flowing from positive DC line 612 to positive DC line 502. Anode of diode 618 can be connected to positive DC line 502 and a The cathode of diode 618 can be connected to the positive DC line 612. Power that can otherwise be fed back to the PFC 204 module when the motor-compressor is reduced or driven backwards can instead be distributed for the condenser motor and / or the condenser rectifier module 602. In several implementations the condenser inverter module 610 can convert the second DC power to three-phase AC power and supply the phases of the AC power to three respective windings of the mo - condenser torque.
    Alternatively, the inverter module of capacitor 610 can convert the second DC power to more or less power phases.
    In several implementations the 610 capacitor inverter module can be similar or identical to the 208 inverter power module. A 630 capacitor motor control module controls the 610 capacitor inverter module and can operate in a similar way to the motor control module. capacitor 530 of figure 5. The condenser motor control module 630 and the condenser control module 604 can be implemented independently of the LC 280 or can be implemented with components of the IC 280 in a common LC, such as as inside a 650 compressor / condenser lC. In several implementations, the condenser motor control module 630 can receive the condenser speed commanded from the supervisor control module 270 or from the system controller 130 In several implementations the controlled capacitor speed can be provided by the user interface 134 of figure 1. Typical PFC systems can receive a vol fixed controlled bus speed.
    This fixed bus voltage, however, may be greater than is necessary to power compressor 102, particularly in active PFC systems.
    The combination of excessive fixed bus voltage and power losses inherent in the operation of the PFC when compared
    due to passive / standard grinding, can result in significant power losses. In addition, low values of the fixed bus voltage can cause the PFC system to switch on and off repeatedly, which can result in shutdowns or failures. Under different operating conditions, the fixed bus voltage may be lower than is necessary to operate the PFC system efficiently. More specifically, the fixed bus voltage may be insufficient to operate motor 400 at a desired speed under a high load. Therefore, a system and method are presented, which include a variable bus voltage. More specifically, the system and method can determine a desired VDES bus voltage based on one or more system parameters. For example, only VDES can be controlled within a range of 355 V to 410 V. The system's method determines a VBUS commanded bus voltage based on VDES and VBUS is used to control the operation of the PFC 204 module. PFC 204 module is switched on, the bus voltage is measured and VBUS is tilted from the measured bus voltage to a predetermined starting voltage, during a predetermined starting period. The predetermined starting voltage can be chosen to stabilize the PFC 204 module, to prevent component damage and / or to prevent trips and failures. For example only, the predetermined starting voltage can be 410 V and the predetermined starting period can be 15 seconds. After the predetermined starting period, VBUS is controlled based on VDES and VPEAK, as described in more detail below. Referring now to Figure 7, an example of a bus voltage determination module 700 is shown in more detail. In several implementations the 700 bus voltage determination module can be implemented in the supervisor control module
    270. The bus voltage determination module 700 includes a voltage determination module 701, a bus voltage control module 704, a start module 706 and a limit module.
    rate determination 708. The voltage determination module 701 can include a look-up table 702. The voltage determination module 701 receives a plurality of system parameters.
    The voltage determination module 5 701 determines VDES based on at least one of the pIurality of system parameters.
    The plurality of system parameters can include, for example, for example only, actual and commanded compressor speed, actual and estimated inverter output power, actual and estimated drive input power, input and output current, percentage of volts output (OOV), drive input voltage, inverter output voltage, estimated motor torque, demand from condenser 104, and various temperatures.
    For example only, the various temperatures can include temperatures of the PFC 204 module, the 208 power inverter module, one or more circuit boards, a compressor screw and the motor-compressor.
    Drive input power is the electrical power flowing in the PFC 204 module when measured between the first and second AC 302 and 304 input terminals (see figure 3a). The drive input power can be measured using a power meter with the current input line and the voltage measured between the first and second AC input terminals 302 and 304 as the two inputs for the meter.
    The output inverter power is measured at the three drive output terminals of the 208 power inverter module (see figure 4a). The output power of the inverter can be determined by measuring each phase current (la, lb and lc) and the voltage of each line to line (Va-Vb, Vb-Vc and Vc-Va) The difference between the output inverter (power going to the motor 400) and the drive input power (power entering the PFC 204 module) represents the power consumed by the PFC 204 module and the 408 power inverter module. For example only, when the power (eg actual and estimated output inverter power, real and estimated input power
    da) increases, VDES can be increased or decreased.
    When current (for example, input current, output current) decreases, VDES can be increased or decreased.
    When the line voltage (for example, drive input voltage and inverter output voltage) decreases, 5 VDES can be decreased.
    When the engine speed (for example, actual and controlled compressor speed and OOV percentage) increases, VDES X can be increased.
    When torque (for example, motor torque in compressor 102) increases, VDES can be increased.
    When some of the selected temperatures decrease, VDES can be increased.
    In addition, changes in any combination of the parameters described above can affect VDES.
    Lookup table 702 can store predetermined relationships between VDES, peak AC voltage VPEAK, and combinations of the plurality of system parameters.
    Lookup table 702 can include data that corresponds to a predetermined range of VDES.
    For example, the default range for VDES can be 355 V to 410 V.
    Lookup table 702 can also include data that correspond to additional VDES values.
    The bus voltage control module 704 receives VPEAK, the peak voltage of the AC line signal.
    The peak voltage of the AC line signal can be determined by simply monitoring the voltage of the AC line signal, such as by means of periodic digital sampling, and selecting the highest voltage as the peak voltage. However, this method is subject to noise and other transients that can cause the measured peak voltage to be artificially high.
    Alternatively, VPEAK can be determined by multiplying the absolute mean value of the AC line signal by n / 2. The absolute average value of the AC line signal is much less subject to noise and other transients.
    VPEAK can be determined at predetermined intervals, such as once per AC line cycle.
    The bus voltage control module 704 determines VBUS based on VDES from the flight determination module 701. As discussed further below, the bus voltage control module 704 can adjust VBUS based on a or more other parameters such as VPEAK, VHOLD, and the measured bus voltage.
    When the PFC 204 module is switched off, the measured bus voltage may be less than VPEAK, due to the passive operation of 5 diodes inside the PFC 204 module. After the PFC 204 module is initially turned on, the Starting 706 generates a starting signal that has a first state (for example, high, or "1"). The start module 706 can keep the start signal in the first state for a predetermined start period (tsTART) - For example only, tsTART can be approximately 15 seconds.
    The start signal is sent to the bus voltage control module 704. To avoid a discontinuity, the bus voltage control module 704 can adjust VBUS for the measured bus voltage when the start signal having the first state is received.
    The start signal can also be sent to the rate limiting module 708. The rate limiting module 708 can generate a limited commanded bus voltage by applying a rate limit to VBUS from the bus voltage control module. 704. However, when the rate limitation module 708 receives the starting signal that has the first state, the rate limitation module 708 initializes the limited commanded bus voltage for VBUS, which has been adjusted based on the voltage of measured bus.
    After initializing the limited commanded bus voltage for VBUS, the rate limiting module 708 returns to generate the limited commanded bus voltage by applying a rate limit for changes in VBUS.
    Unlimited commanded bus voltage is used to control the PFC 204 module. For example only, the rate limiting bus 708 module can output the limited command bus voltage to the PFC 250 control module. The rate limiting 708 module you can implement rate limiting by adjusting the limited commanded bus voltage in the direction of VBUS after each time interval of a specified length.
    The amount by which the bus voltage
    limited commandment can change during each time slot is limited to a specified increment.
    The average rate applied by the rate limitation module 708 is then a ratio of the specified increment, to the specified length. 5 The rate applied by the rate limiting module 708 can be asymmetric, with a higher rate in one direction than in another (for example, decreasing is limited to a higher rate than increasing). In many implementations the rate limitation may be non-linear.
    After starting to generate the start signal that has the first state, the 706 starting module can supply a VSTART starting voltage to the 704 bus voltage control module. VS- TART can be chosen as a minimum voltage which will create stable starting conditions for the PFC 204 module. For example only, VSTART can be approximately 410 V.
    While the start signal remains in the first state, the bus voltage control module 704 adjusts VBUS. to be equal to VSTART.
    Since the rate limitation module 708 applies a rate limit, the limited commanded bus voltage begins to tilt towards the new VBUS value, VSTART.
    For example only, if VSTART is 410 V and the measured bus voltage is 325 V, the rate limiting module 708 can tilt the commanded bus voltage Unlimited from 355 V to 410 V.
    After the predetermined starting period tSTART, the starting module 708 transitions the starting signal to a second state (for example, low or "0"). When the start signal has the second state, the bus voltage control module 704 starts to control VBUS based on VDES.
    The bus voltage control module 704 can apply a lower limit for VDES when determining VBUS.
    The PFC 204 module can be configured to boost the DC bus voltage to greater than VPEAK.
    For example only, the PFC 204 module may be able to maintain a limited commanded bus voltage that is greater than VPEAK plus a displaced voltage.
    In contrast, the PFC 204 module may not be able to produce a limited commanded bus voltage that is less than the displaced voltage plus VPEAK.
    To produce such a limited commanded bus voltage the PFC 204 module can be switched off and on.
    Switching the PFC 204 module off and on can create unstable conditions and result in trips or failures.
    Therefore, when determining VBUS, the bus voltage control module 704 can apply a lower limit which is equal to VPE-AK plus the displaced voltage.
    For example only, the displaced voltage can be approximately 30 V.
    In other words, the bus voltage command module 704 can increase VBUS to a lower limit when the lower limit is greater than VBUS.
    The bus voltage control module 704 also increases VBUS to the value of VDES when VDES is greater than VBUS.
    The bus voltage control module 704 can prevent a reduction in VBUS unless a predetermined period has elapsed since VBUS was last increased.
    In addition, at the end of the predetermined period, the bus voltage control module 704 can determine the lower limit based not on the current VPEAK value, but on the highest VPEAK value observed within the predetermined period. This prevents prematurely decreasing VBUS when an unusually low value of VPEAK was observed at the end of the predetermined period.
    For example only, the predetermined period can be approximately 10 seconds.
    Referring now to figure 8, a flowchart outlines an example of operation for the bus voltage determination module 700. Control starts at 804 where the control sets VBUS equal to the measured bus voltage.
    Control then allows VBUS rate limitation in 808. When rate limitation is enabled, control applies the rate limit for changes in VBUS and outputs the common result.
    limited commanded bus voltage. In 812 the control adjusts VBUS equal to a predetermined starting voltage VSTART. In 816 the control waits for a predetermined starting period tSTART. For example only, tSTART can be 5 approximately 10 seconds and VSTART can be approximately 410 V. As described above, the control rate limits the transition from VBUS from the measured bus voltage to VSTART. Control continues at 820 and sets a VHOLD peak holding voltage equal to the peak current AC voltage VPEAK. In 824 the control initializes a timer to zero, which allows the timer to track a period of time that has elapsed since the timer was last started. In 828, the control determines the desired VDES bus voltage based on one or more system parameters. In 830 the control determines whether: (1) VBUS is less than a sum of VPEAK and an offset voltage; and / or (2) VBUS is less than VDES. If either of these conditions is true, the control transfers to 832. If both conditions are false, the control continues to 848. At 832 the control determines whether VBUS is less than the sum of VPEAK and the displaced voltage. If true, the control sets VBUS equal to the sum of VPEAK and the displaced voltage at 836 and continues to
    840. Otherwise, control is transferred to 840. At 840 the control determines whether VBUS is less than VDES. If true, the control sets VBUS equal to VDES at 844 and returns to 820; if false, the control simply returns to 820. In this way, the control increases VBUS and sets the timer when VBUS is less than VDES or the sum of VPEAK and the displaced voltage. In 848 the control determines whether the timer is longer than a predetermined period. If true, control transfers to 852; if false, the control continues until 854. For example only, the predetermined period can be approximately 10 seconds. In 854 the control determines whether VPEAK is greater than VHOLD. If true, the control updates VHOLD to be equal to VPEAK at 868 and returns to 828; if false, the control simply returns to 828. In this way VHOLD tracks the highest VPEAK observed since VHOÇD was started in
    820. In 852 the control determines whether VDES is less than a sum of VHOLD and the displaced voltage. If true, the control sets VBUS equal to the sum of VHOLD to the displaced voltage at 858 and returns to 820; if false, the control sets VBUS equal to VDES at 860 and resumes to
    820. In other words, each time the predetermined period expires as measured by the timer at 848 VBUS it can be reduced by the largest VDES and the sum of VHOLD (the highest VPEAK observed within that predetermined period and the displaced voltage. The predetermined period can be selected to be long enough that VHOLD is relatively stable while not keeping VHOLD at an artificially high level for a long time. The broad teachings of the disclosure can be implemented in a variety of ways. Therefore, although this disclosure includes particular examples, the real scope of the disclosure should not be so limited, since other changes will become evident to the skilled practitioner, when studying the drawings, specification and claims below.
    权利要求:
    Claims (18)
    [1]
    1. Controller comprising: a voltage determination module that determines a desired direct current (DC) bus voltage for an electrically connected DC bus between a power factor correction module (PFC) and a power inverter module that drives a motor-compressor, in which the voltage determination module determines the desired DC bus voltage based on at least one of the motor-compressor torque, a motor-compressor speed, a power - output voltage of the power inverter module, and a drive input power; a bus voltage control module that determines a controlled bus voltage based on the desired DC bus voltage; and a PFC control module that controls the PFC module, to create a voltage on the DC bus that is based on the commanded bus voltage.
    [2]
    2. Controller according to claim 1, wherein the bus voltage control module adjusts the commanded bus voltage equal to a measured DC bus voltage when the controller transitions from its off state to an On state .
    [3]
    3. Controller according to claim 2, further comprising a rate limiting module that generates a limited voltage rate, wherein: the PFC control module controls the PFC module to create the limited voltage rate on the DC bus , and the limited voltage rating is equal to the measured voltage of the DC bus when the controller transitions from the off state to the ON state.
    [4]
    4. Controller according to claim 3, wherein, after the controller transitions from the off state to the on state:
    the bus voltage command module adjusts the command bus voltage equal to a predetermined start voltage for a predetermined start period, and the rate limiting module tilts the limit voltage rate in the direction of the voltage controlled bus during the predetermined departure period,
    [5]
    5. Controller according to claim 1, in which: the bus voltage control module increases the commanded bus voltage to a higher of the desired DC bus voltage and a first sum, when the commanded bus voltage is less than either the desired DC bus voltage, or the first sum, and the first sum is equal to a predetermined displacement plus a peak voltage of an AC line that powers the PFC module.
    [6]
    6. Controller according to claim 5, in which: the bus voltage control module decreases the commanded bus voltage to a higher of the desired DC bus voltage and a second sum, after a period of predetermined time at which the commanded bus voltage has not been increased, and the second sum is equal to the predetermined displacement plus a highest value of the peak voltage observed during the predetermined period.
    [7]
    7. System comprising: the controller as defined in claim 1: the PFC module; the power inverter module; and a condenser inverter module that drives a condenser fan using power from the DC bus.
    [8]
    8. System comprising: the controller as defined in claim 1; the PFC module;
    the power inverter module; a capacitor inverter module that drives a condenser fan using power from a second DC bus: and an electrical connection between the DC bus and the second DC bus and which provides excess power from the DC bus to the second DC bus.
    [9]
    9. Method that comprises: converting incoming AC power to DC power, using a power factor correction module (PFC); convert DC power to AC power using a power inverter module; start a motor using AC power; determine a desired voltage for DC power based on at least one of the motor torque, a motor speed, an output power of the power inverter module, and a drive input power; generate a controlled voltage based on the desired voltage; and controlling the PFC module to produce DC power at a voltage based on the commanded voltage.
    [10]
    A method according to claim 9, further comprising adjusting the command voltage equal to a starting voltage for a predetermined starting period when energizing.
    [11]
    The method of claim 10, further comprising: generating a limited command voltage by limiting a rate of change of the command voltage; control the PFC module to produce DC power at the limited commanded voltage; and at the beginning of the predetermined starting period, initialize the limited controlled voltage to a measured voltage of the DC power.
    [12]
    12. Method according to claim 9, further comprising
    maintaining the commanded voltage to be greater than or equal to the desired VOICE.
    [13]
    A method according to claim 12, further comprising: determining a threshold voltage based on a sum of a predetermined positive displaced voltage and a measured peak voltage of the incoming AC power; and maintaining the controlled voltage to be greater than or equal to the threshold voltage.
    [14]
    A method according to claim 9, further comprising: increasing the commanded voltage to the desired voltage when the desired voltage is greater than the commanded voltage; and increase the commanded voltage to a first threshold voltage, when the first threshold voltage is greater than the commanded voltage, where the first threshold voltage is based on a sum of a predetermined positive displaced voltage and a measured peak voltage of the incoming AC power.
    [15]
    15. Method according to claim 14, further comprising selectively decreasing the commanded voltage to a greater than a second threshold voltage and the desired voltage, after a predetermined period has elapsed, in which the commanded voltage does not was increased, in which the second threshold voltage is based on a sum of the displaced voltage and a higher value of the measured peak voltage of the incoming AC power throughout the predetermined period.
    [16]
    16. System comprising: a power factor correction module (PFC) that converts incoming AC power to DC power: a power inverter module that converts DC power to three-phase AC power and drives a compressor motor using three-phase AC power; and a controller that includes: (i) a voltage determination module that determines a desired voltage for DC power based on at least one of a 5 "plurality of system parameters; (ii) a voltage command module that generates a controlled voltage based on the desired voltage, in which the voltage control module adjusts the voltage, commanded equal to a starting voltage for a predetermined starting period after the controller is energized, and in which, after the starting period predetermined voltage command module: (a) increases the commanded voltage to the desired voltage when the desired voltage is greater than the commanded voltage, (b) increases the commanded voltage to a first threshold voltage when the first threshold voltage is greater than the commanded voltage, where the first threshold voltage is based on a sum of a predetermined positive displaced voltage and a measured peak voltage of the incoming AC power, and (C) d selectively reduces the voltage commanded to a higher of a second threshold voltage and the desired voltage after a predetermined period has elapsed, in which the command voltage has not been increased, where the second threshold voltage is based on a sum of the displaced voltage and a higher value of the measured peak voltage of the incoming AC power observed over the entire predetermined period; (iii) a rate limitation module that generates a limited commanded voltage, limiting a rate of change of the commanded voltage, in which when the controller is energized, the rate limitation module initiates the limited commanded voltage for a measured voltage DC power; and (iv) a PFC control module that controls the PFC module to produce DC power at the limited commanded voltage.
    [17]
    17. The system according to claim 16, further comprising the compressor.
    [18]
    18. The system according to claim 16, wherein the plurality of system parameters includes, at least, one of the motor torque, one motor speed, one output power of the power inverter module, and a drive input power.
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    同族专利:
    公开号 | 公开日
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    US8508166B2|2013-08-13|
    US9088232B2|2015-07-21|
    KR20120040739A|2012-04-27|
    WO2011019701A3|2011-06-23|
    EP2465188A2|2012-06-20|
    KR101386939B1|2014-04-18|
    CN102549901B|2015-02-25|
    EP2465188A4|2017-08-09|
    RU2012105436A|2013-09-20|
    US9564846B2|2017-02-07|
    AU2010282629A1|2012-02-23|
    CN102549901A|2012-07-04|
    US20140152209A1|2014-06-05|
    WO2011019701A2|2011-02-17|
    AU2010282629B2|2014-03-13|
    EP2465188B1|2019-11-06|
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    法律状态:
    2020-08-18| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-08| B11B| Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements|
    2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    US23275409P| true| 2009-08-10|2009-08-10|
    US61/232,754|2009-08-10|
    US12/852,557|US8508166B2|2009-08-10|2010-08-09|Power factor correction with variable bus voltage|
    US12/852,557|2010-08-09|
    PCT/US2010/044993|WO2011019701A2|2009-08-10|2010-08-10|Power factor correction with variable bus voltage|
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