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    • 专利摘要:
    The present invention relates to a system for converting a continuous electrical power into alternative electrical power. The conversion system includes an assembly on a printed circuit board (14) of a plurality of power modules (7), an electrical energy recovery module, and a coil. The present invention also relates to a method of assembling such a conversion system, and a motor system comprising such a conversion system.
    公开号:FR3044184A1
    申请号:FR1561213
    申请日:2015-11-23
    公开日:2017-05-26
    发明作者:Wissam Dib；Denny Chiono；Davide Bettoni
    申请人:IFP Energies Nouvelles IFPEN；Mavel SRL；
    IPC主号:
    专利说明:

    The present invention relates to the field of converters for the conversion of electrical energy, in particular for high speed and / or variable speed electrical machines.
    A static converter is a system for converting an electrical signal into another electrical signal having different characteristics. For example, a converter can be used to convert an alternating voltage into another AC voltage with a different frequency and / or amplitude, it is called an AC / AC converter. According to another example, a converter can be used to convert an alternating voltage into a DC voltage, which is called an AC / DC converter or AC / DC converter. For DC / AC reverse conversion, it is called DC / AC converter. According to a last example, a converter can convert a DC voltage into a DC voltage of different voltage, it is called DC / DC converter. The converters may be reversible or non-reversible. Generally, the conversion is implemented by means of switches (switches) controlled.
    To control electrical machines, including permanent magnet electric machines, from electrical energy storage system (s) (for example a battery), it is necessary to convert the continuous electrical energy into three-phase AC energy. This conversion can be performed by means of a DC / AC converter. Such a converter must provide three sinusoidal voltages shifted by electrical 120 ° relative to each other, the amplitude of which depends directly on the requested torque (but also on the rotational speed), the frequency of which depends solely on the rotation speed of the electric machine connected to the converter.
    Conventionally, a DC / AC converter comprises three switching arms. Each switching arm has two controlled switches and two diodes placed in parallel with the controlled switches. Depending on the charging current required, an arm can be composed of several 'sub-arms' in parallel. The phases of the electric machine are connected to the midpoint of each arm. Each arm is controlled separately by controlling the opening and closing of the switches on switching periods, so as to form a three-phase signal.
    Figure 1 illustrates such a conventional DC / AC converter. The DC voltage of the electrical energy storage means is indicated Udc. The three-phase motor M is schematically represented by three coils fed by currents Ia, Ib and Ic. The converter comprises three switching arms A, B, C, each switching arm A, B, C is connected to a phase of the electrical machine M. Each switching arm comprises two switches 1 and two diodes 2. The switching arms A, B, C are arranged in parallel between the two continuous input phases of the voltage converter Udc. The output phases of the switching arms A, B, C are connected to the midpoint (between the two switches) of the switching arms.
    FIG. 2 shows the control signal COM of the switches with a constant duty cycle of 50%, the voltage Udc and the current at the terminals of a switch, for a conventional DC / AC converter (as described above with reference in Figure 1). For the control signal COM, the lower part of the slot corresponds to the open switch, and the upper part of the slot corresponds to the closed switch. We speak for this case of so-called hard switching or 'all or nothing' (of English "hard switching"). It should be noted that for this design of the converter, the voltage Udc and the current lo are exceeded. The current lo corresponds to the permanent value of the, and corresponds to the current sent to the electric machine.
    Thus, the main drawbacks of this conventional design of the converter are the following: • losses by switching: this design has significant switching losses, which tends to make its use incompatible with high switching frequencies and therefore for electrical machines used at very high speeds, • current / voltage overshoot: as shown in FIG. 2, this strategy has overshoot and current during the instantaneous switching of the switch. Thus this type of control requires a margin taken on the voltage and current of the various components during the design of the converter (also called inverter). This implies an over-dimensioning of the components used, (for example: for a 300 Volt DC bus voltage, an IGBT switch with a nominal voltage of 600 Volts is used), and • significant electromagnetic emissions (EMC).
    Starting from the disadvantages of the strategy "Hard switching" (losses, incompatibility with high speed motors), a design called soft switching (or "soft switching") has been developed. Thus, to limit current and voltage surges on the switches, a coil and a capacitor are added to the previous circuit. The coil modulates the variation of the current di / dt ("Turn-On"), and the capacitor modulates the variation of the voltage dv / dt ("Turn-Off"). In addition, and in order to ensure the operation of the circuit, and therefore a zero energy balance, a resistor is added in the circuit between the voltage of the energy source used and the capacitive circuit. This resistance makes it possible to ensure the operation of this circuit and to reduce the voltage at the terminal of the capacitive circuit. Such a DC / AC converter design is described in particular in the patent application WO 11016854.
    Figure 3 shows a simplified diagram of a switching arm (with two switches 1) with capacitance Cs, coil Ls, resistor R and capacitance Cov for smooth switching. This circuit is known by the English name "Undeland Snubber". The voltage Udc corresponds to the voltage at the terminals of the means for storing the continuous electrical energy. The coil Ls is placed between a continuous input phase Udc and the switching arm A. A branch starts from the junction between the coil Ls and the switching arm A, this branch comprises two diodes D, and arrives at a junction between the resistance R and the capacitor Cov. The other end of the resistor R is connected to the continuous input phase of the converter. The other end of the capacitor Cs is connected to the alternating output phase of the switching arm A. The other end of the capacitor Cov is connected to ground. The capacitor Cs makes it possible to modulate the evolution of the voltage across the switch. This capacity stores a portion of the energy due to the soft switching of the switches. The other part of this energy is stored in a capacity of higher Cov value. Then, the energy stored in the capacity is returned to the used storage system (battery) through the resistor. The coil Ls modulates the evolution of the current across the switch. In fact, the energy created by the coil Ls is not fully stored in the capacitor Cs, hence the need for a second capacitance Cov of a value higher than Cs. The resistor ensures the operation of the system and allows to reduce the voltage Vrec.
    FIG. 4 shows, in a manner similar to FIG. 2, the switching signal COM, revolution of the voltage Udc and of the current Ie of the switch during a so-called "soft" switching. For the control signal COM, the lower part of the slot corresponds to the open switch, and the upper part of the slot corresponds to the closed switch. It is noted in this figure that the voltage overruns Udc and current are decreased compared to the so-called "hard" switching.
    The advantages of soft switching are: • less switching losses, this converter design is compatible with high switching frequencies, so this design can be used to drive high speed electrical machines, • little voltage overshoot and current on the switch, so no need to oversize the components, and • revolution of the voltage and current across the switches during the transition is modulated by the choice of Ls and Cs respectively.
    This converter design requires a particular arrangement of the various electrical components, which makes their assembly long and complex. Moreover, this design of the converter has a major disadvantage, which is the need to dissipate energy in the resistor, the objective of which is to make the energy balance of the passive elements zero and therefore to reduce the voltage Vrec, which implies energy losses, and consequently a decrease in the efficiency of the converter.
    To overcome these drawbacks, the present invention relates to a system for converting a continuous electrical power into alternative electrical power. The conversion system includes an assembly on a printed circuit board of a plurality of power modules, an electrical energy recovery module, and a coil. Thus, the assembly of different modules on a printed circuit board allows a simple and fast installation of the conversion system. In addition, the power module according to the invention is adapted to a smooth switching, by the presence of the coil, which allows to minimize the losses by switching, and limit voltage and current overshoot. In addition, the electric energy recovery module reduces energy losses.
    The system according to the invention The invention relates to a system for converting a continuous electrical power into three-phase AC electrical power comprising three switching arms. The conversion system includes an assembly on a printed circuit board of at least one switching arm power module, an electrical energy recovery module, and a coil for smooth switching.
    Advantageously, said assembly is disposed in a housing.
    According to one embodiment of the invention, said power modules comprise two switches, two diodes and two capacitors.
    According to a design of the invention, said electric energy recovery module comprises three branches connected at a junction point, with: a first branch comprising a switch, a second branch comprising a diode, a third branch comprising an inductor , and - a capacitor.
    According to an alternative embodiment, each switching arm comprises a plurality of associated power modules, preferably between two and four modules.
    Advantageously, said power modules, said coil and said electric energy recovery module are mounted on one side of said printed circuit board, and capacitors are installed on the other side of said printed circuit board.
    According to one embodiment of the invention, said conversion system comprises a cooling system, preferably a liquid cooling circuit.
    Preferably, said cooling system is placed between said circuit board and said power modules and electrical energy recovery.
    According to an implementation of the invention, said conversion system comprises a circuit for measuring voltages and / or currents.
    According to a characteristic of the invention, said coil comprises several layers of copper obtained by chemical etching, and insulated by means of an insulating coating.
    In addition, said conversion system may include a control card.
    According to one design, said conversion system comprises a power supply card.
    According to one embodiment of the invention, said printed circuit board is a multilayer card with high density of copper.
    In addition, the invention relates to a method of mounting a conversion system according to one of the preceding features. For this method, the following steps are performed: a) positioning at least one power module per switching arm, and an electric energy recovery module; b) assembling said power modules on a printed circuit board; c) assembling said electrical energy recovery module on said printed circuit board; and d) assembling a coil on said printed circuit board.
    Advantageously, said power modules and electrical energy recovery in a housing.
    Preferably, said power and electrical energy recovery modules, and the coil are assembled to said printed circuit board by welding, screwing and / or latching.
    According to an alternative embodiment, said method comprises a step of assembling capacitors on one side of said printed circuit board opposite the side of said printed circuit board on which said power modules and said recovery module are assembled.
    According to a design of the invention, said method comprises a step of assembling a cooling system between said printed circuit board and said power modules and electrical energy recovery.
    According to a feature of the invention, said method comprises at least one step for installing a measurement circuit and / or a control card and / or a power supply card. The invention also relates to an engine system comprising at least one electrical energy storage means and a three-phase electrical machine. The motor system comprises a conversion system according to one of the preceding characteristics, for converting the continuous electrical energy of said electrical energy storage means into three-phase AC electrical energy for said electric machine.
    BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the system according to the invention will become apparent on reading the description hereafter of nonlimiting examples of embodiments, with reference to the appended figures and described below.
    FIG. 1, already described, illustrates a conventional DC / AC converter, with hard switching, according to the prior art.
    FIG. 2, already described, illustrates the switching signal, the voltage and the intensity in a phase for a DC / AC converter according to the design of FIG.
    Figure 3, already described, illustrates a DC / AC converter according to the prior art, with soft switching.
    FIG. 4, already described, illustrates the switching signal, the voltage and the intensity in a phase for a DC / AC converter according to the design of FIG.
    FIG. 5a illustrates an exemplary embodiment of the electric energy recovery module for a converter according to one embodiment of the invention.
    FIG. 5b illustrates an equivalent model resistive to the electric energy recovery module of FIG. 5a.
    FIG. 6 illustrates an electrical diagram of a power module according to one embodiment of the invention.
    Figure 7 illustrates the design of a power module according to an embodiment of the invention.
    FIG. 8 illustrates, according to a first view, the printed circuit board equipped with the power modules according to one embodiment of the invention.
    FIG. 9 illustrates, according to a second view, the printed circuit board equipped with the power modules according to one embodiment of the invention.
    Figure 10 illustrates a housing for the energy conversion system according to one embodiment of the invention.
    Detailed description of the invention
    The present invention relates to a conversion system (converter) DC / AC for converting a continuous electrical energy into three-phase AC electrical energy. Advantageously, the conversion system according to the invention can be bidirectional (reversible). Thus, by means of the conversion system according to the invention, a three-phase AC energy can be converted into continuous electrical energy.
    Conventionally, the conversion system according to the invention comprises three switching arms, a continuous input phase, and three alternative output phases. Each converter arm may comprise two controlled switches and two diodes. In a known manner, the control of the switches makes it possible to generate an alternating voltage. The alternative output phases of the conversion system are connected to the midpoint of each switching arm, that is to say between the two switches.
    According to the invention, the conversion system comprises an assembly on a printed circuit board, also called PCB (of the English "Printed Circuit Board"): - at least one power module per switching arm, the power module comprises at least two switches for converting the DC power into AC power, - at least one coil, which modulates the current variation for soft switching, and - a recovery module of electrical energy, which makes it possible to recover the energy available or created during the so-called soft switching, by recovering the energy available during soft switching, and by sending it to electrical energy storage means (by example a battery), connected to the continuous phases of the conversion system.
    The printed circuit board makes it possible in particular to electrically connect the different modules (power and electrical energy recovery), as well as the coil, without the use of electric wire. The printed circuit board is preferably substantially planar and may be substantially rectangular in shape. The printed circuit board may be of the high density multilayer copper card type, so as to optimize its design. In this case, the current lines are included in at least one inner layer of the printed circuit board. This type of multilayer board is suitable for high currents. The printed circuit board may include plugs for connecting the continuous inputs and alternative outputs of the conversion system. In addition, the printed circuit board may include fixing means for assembling the different modules and the coil. These fixing means may be orifices, slots and / or projections.
    A module is an independent element in the form of a block, which groups together all the electronic components that provide a function. Thus, each power module is a block which comprises switching means for a switching arm, and the electric energy recovery module is a block which comprises electronic means for the recovery of electrical energy. This embodiment in module form, allows a simplified assembly and modularity of the conversion system. Indeed, the blocks can be manufactured separately, and in a standard way, and the conversion system is composed of different modules (blocks) assembled on a printed circuit board. Thus, it is not necessary to assemble all the electronic components of the conversion system on a single element. In addition, this embodiment in the form of modules, facilitates maintenance: it is possible to replace only a defective module without having to replace the entire converter. Another advantage of this design is the possibility of using standard modules, which can be chosen according to the desired application.
    According to one embodiment, the various modules (power or electrical energy recovery), as well as the coil are assembled on the printed circuit board by soldering, screwing and / or clipping ("clipping") or any similar means . These assembly means allow a quick assembly.
    The various embodiments, including the constitution of the different modules described in the description can be combined.
    Each power module serves as the switching arm of the conversion system. The power module can comprise: two inputs, able to be connected to the continuous inputs of the conversion system, the first input can be connected to a positive voltage, and the second input can be connected to ground, two switches connected in series. between the two inputs, the switches can be controlled, so as to provide an alternating output current, - an output, able to be connected to an AC output phase of the conversion system, the output is connected at a point between the two switches, - two diodes, allowing the passage of current in one direction, and - two capacitors, a first capacitor said voltage modulation capacitor (which allows the modulation of the voltage variation for soft switching) and a second capacitor (which allows to store the created energy which is not stored in the first capacitor during the modulation of the voltage).
    Such a power module is compatible with a wide range of voltage operation.
    According to one embodiment of the invention, the power module contains only these electronic components: two switches, two diodes, and two capacitors. For this embodiment, only the second capacitor can be formed by a parallel association of several capacitors (for example 2 or 3 capacitors).
    In addition, the power module is adapted to a conversion system which comprises an electric energy recovery module. The power module may include a second output capable of being connected to the electric energy recovery module. This second output can be connected to a diode.
    According to one embodiment of the invention, the diodes of the power module are connected in series. The diodes can be connected to a first input of the power module. For example, the input connected to the positive voltage. In the case where the power module comprises a second output for an electric energy recovery module, the diodes are connected to this second output.
    In addition, the voltage modulation capacitor may be mounted between a point between the two diodes and the first output.
    In addition, the second capacitor can be mounted between the second output and the second input of the power module, that is to say on the input of the power module, on which the diodes are not mounted, for example this second entry can correspond to the mass.
    According to a characteristic of the invention, the switches of the power modules can be MOSFET switches (acronym for "Metal Oxide Semiconductor Field Effect Transistor" which is translated by field effect transistor with metal-oxide-semi structure -conductor) and / or IGBT (Insulated Gate Bipolar Transistor), depending on the input voltage of the DC bus. For high voltage, IGBT switches (switches) can be used. For low voltage, MOSFET switches can be used.
    Preferably, the switches can be controlled by a pulse width modulation method (PWM or PWM for "Pulse Width Modulation"). The general principle of this modulation method is that by applying a succession of discrete states for well-chosen periods of time, any intermediate value can be averaged over a certain period of time.
    For modulation of the voltage variations, the first voltage modulation capacitor may have a value of between 4 and 15 nF, preferably between 4 and 10 nF.
    The second capacitor preferably has a higher capacitance than the first capacitor. The second capacitor may have a value between 500 and 5000 nF, preferably between 600 and 2500 nF. According to an alternative embodiment of the invention, the second capacitor may be formed of several associated capacitors in parallel and / or in series. Advantageously, to limit the size, the second capacitor can be formed of three identical capacities (of the same capacity) associated in parallel.
    Advantageously, the power module is in the form of a block, so as to facilitate its assembly, compactness and standardization. The block may comprise a support, a plate comprising a printed circuit, and the electronic components (switches, diodes, capacitors) of the power module. The plate may be in the form of a printed circuit. The electronic components are mounted on the plate. The plate is mounted on the support. The block may be arranged to be mounted on the printed circuit board of a conversion system. The block may have a substantially parallelepiped shape.
    According to an alternative embodiment of the invention, the block may comprise a plurality of fixing means on a card of a conversion system. The fixing means may in particular be at least one notch provided for the passage of a screw. The notch may be provided in the support and / or the block plate. The notch may be of substantially oblong shape. The fastening means may also comprise at least one slot or a projection, so as to allow snap fastening ("clipping") or to allow positioning of the block.
    The block may also comprise fixing means for fixing a plurality of modules together, so as to be able to associate several modules together, particularly for the case where the currents are high, which makes it possible to produce the switching arm of a module. conversion system without using components with high specific characteristics and being expensive.
    FIG. 6 illustrates, in a nonlimiting manner, an electrical diagram of a power module according to one embodiment of the invention. The power module has two inputs E1 and E2 intended to be connected to the continuous inputs of the conversion system. The input E1 can correspond to the positive voltage input, and the input E2 can correspond to the ground. Between the two inputs E1 and E2, two controlled switches 1 are connected in series. Between the two switches 1, the output S is connected, this output S is intended to be connected to an output phase of the conversion system. Two diodes D are connected in series between the input E1 and the second output Vrec, which is able to be connected to an electric energy recovery module. A first capacitor Cs, intended for voltage modulation, is connected at a point between the two diodes D and the first output S. A second capacitor Cov is connected between the second output Vrec and the second input E2.
    FIG. 7 illustrates, schematically and in a nonlimiting manner, a power module according to one embodiment of the invention. The module has substantially the shape of a block 7. The block 7 comprises a plate 8 in the form of a printed circuit on which are mounted different electronic components. The plate 8 has substantially the shape of a rectangle. The plate 8 is mounted on a support 9. The support 9 has substantially the shape of a rectangular parallelepiped. The plate 8 and the support 9 comprise several fixing means: a notch 10 provided for the passage of a screw, and two slots 11 and 12 for snap-fastening and / or for positioning the block. Electronic components (shown schematically) are mounted on the plate 8 on the side opposite the support 9. Among the electronic components, the second capacitor Cov is formed of three capacitors 13 associated in parallel.
    According to the invention, the conversion system further comprises a voltage and intensity modulation circuit. The voltage and current modulation circuit allows for soft switching ("soft switching"), which makes it possible to limit switching losses, to limit voltage and current overshoots on the switches. The modulation circuit comprises a coil, which modulates the current variation, and a capacitor per phase, for modulating the voltage variation. The coil is mounted directly on the printed circuit board. In order to maximize the copper density in the winding of the coil, the winding can be constituted by copper layers obtained by chemical etching and isolated by the application of an insulating coating, so as to minimize the effect of skin that could have a deleterious effect for high frequencies. Each capacitor for modulation is included in one of the power modules.
    According to one embodiment of the invention, the modulation circuit comprises a coil which connects a continuous input phase of the switching system and the switching arms.
    According to the invention, the conversion system further comprises an electric energy recovery module. Advantageously, the electrical energy recovery module does not include resistance. Thus, the conversion system has no resistance, in which energy is dissipated for the prior art. On the contrary, the electric energy recovery module, which replaces the resistor, makes it possible to recover the energy available or created during the so-called soft switching, by recovering the energy available during soft switching and sending it to means for storing electrical energy (for example a battery) connected to the continuous phases of the conversion system. The function of the electric energy recovery module is to discharge the protection circuits of the switches and to make this energy available on the DC bus. Thus, the electrical losses are greatly reduced. The electric energy recovery module is connected to the switching arm and the modulation circuit.
    According to a possible design of the invention, the electric energy recovery module may comprise at least one inductor, at least one diode, at least one capacitor and at least one switch. The switch is controlled to allow the recovery of energy and its transfer to the electrical energy storage means. Advantageously, the recovery circuit can be realized with a buck topology.
    According to an alternative embodiment of the invention, the electrical energy recovery module may comprise three branches connected at a junction point with: a first branch comprising a switch, a second branch comprising a diode, and a third branch. having an inductor.
    Thus, the circuit board of the conversion system can be modified specifically to use the design of a soft switching converter compatible with high switching frequencies, while minimizing the losses due to the added passive circuit to ensure operation. of the modulation circuit.
    The electrical energy recovery module can be made in the form of a block comprising fixing means to the printed circuit board. The attachment can be made by welding, screwing, latching or any similar means. For this purpose, the fixing means to the printed circuit board may be at least one orifice, for example for the passage of a screw, at least one projection, at least one slot, etc.
    FIG. 5a shows, schematically and without limitation, such an electric energy recovery module. The electric energy recovery module comprises three branches connected at a junction point P, with: a first branch with a switch 6, a second branch comprising a diode 4 (in which flows a current iL as a function of the voltage at its terminals), and - a third branch comprising an inductance Lrec.
    In FIG. 5a, the capacitor 5 represents the capacitance of the electrical energy storage means (battery) and is not a component of the recuperator module. The capacitor 5 is placed between the inductance Lrec and the ground.
    In addition, the capacitor 3 represents the created capacitance, and it is a component of the recuperator module. The capacitor 3 is placed between the switch and the ground.
    Diode 4 is placed between the point of junction of the three branches and the mass.
    By controlling the switch (its duty cycle), it is possible to control the current iL flowing between Vrec and Udc (the current sent to the battery).
    Thus, considering the assembly formed by the recuperator module and the capacitor of the electrical energy storage means, the assembly is formed of three parallel branches, placed between the point P and the mass, with: a first branch comprising the switch 6 and the capacitor 3, - a second branch comprising a diode 4, and - a third branch comprising the inductance Lrec and the capacitor 5 of the means for storing the electrical energy.
    When the switch is closed, the diode is in a locked mode and the current iL that flows in the coil Lrec (shown in Figure 5a) is equal to
    When the switch is open, the diode is a passing mode is the current iL that flows in the coil Lrec (shown in Figure 5a) is equal to
    Thus, by controlling the opening and closing time of the switch, it is possible to control the average value of the current i L, and to have an equivalent operation of a resistive circuit.
    Figure 5b shows, without limitation, an equivalent electrical diagram of the electric energy recovery module shown in Figure 5a. Thus, the electric energy recovery module is equivalent to an equivalent resistor Req, in which a current iL flows, but without dissipation of the electrical energy.
    For this variant embodiment, the average current in this circuit can be expressed in the following form:
    with: - T the switching period of the switch, - Vrec the recovery voltage, - Udc the voltage of the continuous input phase, - Lrec the inductance of the recuperator module, - Req the equivalent resistance - Fsw represents the frequency of the switching of the switches.
    Preferably, such a power recovery module is mounted in the conversion system equipped with the modulation circuit, such that the electric energy recovery module is disposed between a continuous input phase of the conversion system and the junction between the switching arm and the capacitor of the modulation circuit. For the embodiment of FIG. 5a, the electric energy recovery module can be connected in such a way that: the point of the recovery module connected to said continuous input phase (of voltage Udc) of the conversion system corresponds to point of the third branch of the recuperator module between the inductance Lrec and the second capacitor 5 (this capacitor is the capacity of the battery), and - the point of the recuperator module connected to the junction between the switching arm (voltage Vrec) and the capacitor of the modulation circuit corresponds to the point of the first branch of the recuperator module between the switch 6 and the first capacitor 3.
    According to one embodiment of the invention, the conversion system may comprise a housing, in which the assembly is mounted. The housing may comprise several orifices: in particular two for the continuous inputs, to allow the connection with the electrical energy storage system, and three for the alternative outputs, to allow the connection with the phases of the electric machine. Advantageously, the housing may have a substantially parallelepiped shape. In addition, the housing may include means for positioning the various modules before assembly on the printed circuit board. The housing may further include locations for the various circuits and cards that may be part of the conversion system.
    Figure 10 illustrates, without limitation, a housing, without its lid, for a conversion system according to one embodiment of the invention. The housing 17 has a parallelepipedal shape. The housing 17 has several locations 18 for receiving the power modules. According to the illustrated example, the housing 17 has nine locations 18 for nine power modules (three for each switching arm). The housing 17 has a location 19 for receiving an electric energy recovery module. The housing 17 further includes a location 20 for the coil of the soft switching circuit. In addition, the casing 17 has five orifices 21 for connecting the two DC inputs and the three AC outputs. In the figure, different holes and slots are shown, they serve to assemble the modules relative to the printed circuit board, and those located on the edge are used for fixing the cover of the housing.
    According to a design of the converter according to the invention, the printed circuit board may also include capacitors called bus capacitors. These bus capacitors make it possible to decouple the inductance of the cable and the inductance of the coil of the modulation circuit. In order to optimize the surface of the printed circuit board, the bus capacitors are mounted on the printed circuit board on the opposite side to the different modules: the modules are mounted on one side of the board and the bus capacitors are mounted on the other side.
    FIGS. 8 and 9 illustrate, in a nonlimiting manner, according to two distinct angles, a printed circuit board 14, on which power modules 7 (here nine power modules), and bus capacitors 16 are assembled. As seen in FIG. 8, the bus capacitors 16 are assembled below the printed circuit board 14, while the power modules 7 are assembled above the printed circuit board 14. The printed circuit board comprises five plugs 15 for the connection of the continuous inputs and the alternative outputs. In these figures, the electrical energy recovery module and the coil are not shown.
    According to one embodiment of the invention, the conversion system comprises a cooling system. Thus, it is possible to prevent overheating of the electronic components. Preferably, the cooling system is a liquid cooling system, which comprises a circuit in which the liquid circulates. However, the cooling system may be a cooling system by air ventilation or by air circulation. The circuit in which the liquid circulates may have a shape of a coil, so as to optimize the cooled surface. The liquid circuit can be placed between the board and the power modules and electrical energy recovery, so as to simultaneously cool the printed circuit board and the various modules.
    According to one embodiment of the invention, the conversion system comprises a control card. According to one example, the control card can be based on a Texas Instrument DSP, and can perform the following functions: - the conditioning of the analog readings, - the management of the inputs and outputs, - the management of the protections, for example by means of means for switching off the conversion system in the event of overvoltage or over-current, and - PWM modulation for switching arm switches.
    According to one embodiment of the invention, the conversion system may comprise a measurement circuit. The measurement circuit may be formed of a card, which may comprise several sub-cards. The measuring circuit makes it possible to measure the quantities necessary for the control, in particular the voltages and / or the phase currents, and / or the bus voltage and current, and / or the voltage of the electric energy recovery module.
    In addition, the conversion system according to the invention can comprise a power supply card, which can generate a high frequency square wave (for example 18 V to 130 kHz), which can be used by each card (for example, the card of control, the sub-cards of the measuring circuit) to create voltage levels.
    The conversion system according to the invention makes it possible to drive electrical machines, for all types of application, in particular for electric machines running at very high speeds with a high efficiency of the inverter (converter).
    The converter according to the invention may be provided for on-board use, in particular within a vehicle, in particular terrestrial, aeronautical or naval.
    The conversion system according to the invention can also be used in non-electric power generation systems, such as turbines, micro-turbines or wind turbines.
    In addition, the present invention relates to an engine system comprising at least one electrical energy storage means, for example a battery, and a three-phase electrical machine, for example an electric machine with permanent magnets. The motor system comprises a conversion system according to one of the embodiments described above, for converting the continuous electrical energy of the electrical energy storage means into three-phase AC electrical energy for the electric machine, and possibly vice versa. Thus, thanks to the conversion system, the electric machine can be driven, while limiting the electrical losses. In addition, if the conversion system is bidirectional (reversible), then it is also possible to store (for example in a battery) electrical energy generated by the rotation of the electric machine.
    In addition, the present invention relates to a method of assembling a conversion system according to one of the embodiments described above. The assembly method comprises the following steps: a) positioning, in particular within a casing, at least one power module per switching arm, and an electric energy recovery module; b) positioning a printed circuit board with respect to the different modules, and assembling the power modules on the printed circuit board, for example by welding, screwing, latching or any similar means; c) positioning the electrical energy recovery module on the printed circuit board, for example by welding, screwing, latching, or any similar means; and d) assembling a coil on the printed circuit board, for example by welding, screwing, latching, or any similar means.
    Steps b), c) and d) can be performed in any order or simultaneously.
    In addition, the method may comprise a step of assembling bus capacitors on the printed circuit board, on the opposite side of the card, on which the different modules are assembled.
    In addition, the method may comprise a step of setting up and assembling a cooling system. Preferably, the cooling system, particularly in the form of a liquid circulation circuit, can be placed between the printed circuit board and the various modules.
    Furthermore, the method may comprise at least one step for installing at least one of the following elements: a measurement circuit, a control card, a power supply card.
    Comparative example:
    A comparative example was made, in order to compare the losses of the conversion system according to the invention with the losses of the DC / AC conversion systems according to the prior art. The system according to the invention tested corresponds to the circuit according to the embodiment of FIG. 5, with an assembly according to the embodiments of FIGS. 8 and 9. The DC / AC conversion systems of the prior art correspond respectively to switching hard and soft switching, respectively according to the embodiments of Figures 1 and 3.
    For this example, the values used for an inverter with a nominal power of 50 kW are the following: - Ls ~ = 300 microH, - Cs ~ = 6.8 nanoF, - Cov ~ = 1410 nanoF,
    Vrec ~ = 1.5 Vbus, - Lrec = 56 microH, - Creates = 20 nanoF, - Switch type: IGBT.
    Table 1 - Comparative Example
    It should be noted that the conversion system makes it possible to reduce the total losses by approximately 42.5% compared with the conversion systems according to the prior art. This reduction is due to a reduction in switching losses due to soft switching (50% reduction in switching losses compared to hard switching), and a reduction in dissipation losses in the added circuit (85% reduction). losses by dissipation compared to soft switching).
    权利要求:
    Claims (20)
    [1" id="c-fr-0001]
    1) System for converting a continuous electrical power into three-phase AC power comprising three switching arms (A, B, C), characterized in that said conversion system comprises an assembly on a printed circuit board (14) at least one power module (7) per switching arm (A, B, C), an electric energy recovery module, and a coil (Ls) for soft switching.
    [0002]
    2) System according to claim 1, wherein said assembly is disposed in a housing (17).
    [0003]
    3) System according to one of the preceding claims, wherein said power modules (7) comprise two switches (1), two diodes (D) and two capacitors (Cs, Cov).
    [0004]
    4) System according to one of the preceding claims, wherein said electric energy recovery module comprises three branches connected at a junction point (P), with: - a first branch having a switch (6), - a second branch having a diode (4), - a third branch having an inductor (Lrec), and - a capacitor (3).
    [0005]
    5) System according to one of the preceding claims, wherein each switching arm comprises a plurality of associated power modules (7), preferably between two and four modules.
    [0006]
    6) System according to one of the preceding claims, wherein said power modules (7), said coil (Ls) and said electric energy recovery module are mounted on one side of said printed circuit board (14) , and capacitors (16) are installed on the other side of said printed circuit board (14).
    [0007]
    7) System according to one of the preceding claims, wherein said conversion system comprises a cooling system, preferably a liquid cooling circuit.
    [0008]
    8) System according to claim 7, wherein said cooling system is placed between said circuit board (14) and said power modules (7) and electrical energy recovery.
    [0009]
    9) System according to one of the preceding claims, wherein said conversion system comprises a circuit for measuring voltages and / or currents.
    [0010]
    10) System according to one of the preceding claims, wherein said coil (Ls) comprises several layers of copper obtained by chemical etching, and insulated by means of an insulating coating.
    [0011]
    11) System according to one of the preceding claims, wherein said conversion system comprises a control card.
    [0012]
    12) System according to one of the preceding claims, wherein said conversion system comprises a power supply card.
    [0013]
    13) System according to one of the preceding claims, wherein said printed circuit board is a multilayer card with high density of copper.
    [0014]
    14) A method of mounting a conversion system according to one of the preceding claims, characterized in that the following steps are carried out: a) positioning at least one power module (7) per switching arm, and a electric energy recovery module; b) assembling said power modules on a printed circuit board (14); c) assembling said electrical energy recovery module on said printed circuit board (14); and d) assembling a coil (Ls) on said printed circuit board (14).
    [0015]
    15) Method according to claim 14, wherein said power modules (7) and electrical energy recovery in a housing (17).
    [0016]
    16) Method according to one of claims 14 or 15, wherein said power modules (7) and electrical energy recovery, and the coil (Ls) are assembled to said printed circuit board by welding, screwing and / or snap.
    [0017]
    17) Method according to one of claims 14 to 16, wherein said method comprises a step of assembling capacitors (16) on one side of said printed circuit board (14) opposite the side of said printed circuit board ( 14) on which said power modules (7) and said recovery module are assembled.
    [0018]
    18) Method according to one of claims 14 to 17, wherein said method comprises a step of assembling a cooling system between said printed circuit board and said power modules and electrical energy recovery.
    [0019]
    19) Method according to one of claims 14 to 18, wherein said method comprises at least one step for the installation of a measuring circuit and / or a control card and / or a card of food.
    [0020]
    20) Motor system comprising at least one electrical energy storage means and a three-phase electrical machine (M), characterized in that the motor system comprises a conversion system according to one of claims 1 to 13, for converting the continuous electrical energy of said means for storing electrical energy into three-phase AC electrical energy for said electric machine.
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    同族专利:
    公开号 | 公开日
    US10855195B2|2020-12-01|
    US20180351472A1|2018-12-06|
    CN206517316U|2017-09-22|
    CN106787897A|2017-05-31|
    FR3044184B1|2018-03-23|
    WO2017089062A1|2017-06-01|
    EP3381114A1|2018-10-03|
    EP3381114B1|2020-04-08|
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    法律状态:
    2016-11-21| PLFP| Fee payment|Year of fee payment: 2 |
    2017-05-26| PLSC| Publication of the preliminary search report|Effective date: 20170526 |
    2017-11-28| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-28| PLFP| Fee payment|Year of fee payment: 5 |
    2020-11-27| PLFP| Fee payment|Year of fee payment: 6 |
    2021-10-29| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1561213|2015-11-23|
    FR1561213A|FR3044184B1|2015-11-23|2015-11-23|MODULAR SYSTEM FOR CONVERTING CONTINUOUS ELECTRIC POWER IN THREE-PHASE ELECTRIC POWER|FR1561213A| FR3044184B1|2015-11-23|2015-11-23|MODULAR SYSTEM FOR CONVERTING CONTINUOUS ELECTRIC POWER IN THREE-PHASE ELECTRIC POWER|
    EP16791550.3A| EP3381114B1|2015-11-23|2016-10-26|Modular system for converting a dc electrical power into three-phase electrical power|
    PCT/EP2016/075790| WO2017089062A1|2015-11-23|2016-10-26|Modular system for converting a dc electrical power into three-phase electrical power|
    US15/777,729| US10855195B2|2015-11-23|2016-10-26|Modular system for converting a DC electrical power into three-phase electrical power and method the same|
    CN201611025197.XA| CN106787897A|2015-11-23|2016-11-15|For dc power to be converted to the system of three-phase alternating current electrical power, the method and electric system of converting system is installed|
    CN201621227399.8U| CN206517316U|2015-11-23|2016-11-15|System and electric system for dc power to be converted to three-phase alternating current electrical power|
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