Power supply circuit of a rotating electrical machine

Abstract

Electrical circuit (100) for powering a rotating electrical machine (102) for propelling a vehicle comprising: - a polyphase electrical machine (102), - an input interface (101) capable of being connected to a charging station, - a plurality of strings (103) of electrical modules (10), the modules (10) comprising: - a primary terminal (11a) and a secondary terminal (11b), the primary terminal (11a) being connected to the secondary terminal (11b) of another module (10) and / or the secondary terminal (11b) is connected to the primary terminal (11a) of another module (10), - an electrical energy storage unit (12), and - an H-shaped switching bridge (103), the bridge (13) comprising two switching arms comprising two controllable switches (14a, 14b, 14c, 14d) arranged on either side of a point middle (13a, 13b), each midpoint (13a, 13b) being connected to one of the terminals (11a, 11b) of the module (10),the electrical energy storage unit (12) being arranged in a branch in parallel with the switching arms, - a switch system, comprising a first set of switches (107) allowing for each string (30) to connect it to the terminals of a phase (102x, 102y, 102z) of the electrical machine (102) and a second set of switches (106) allowing for each string (30) to connect it to the input interface (101), and - a control unit (109), capable of controlling the switches within the electrical circuit (100), Characterized in that the circuit (100) comprises an electromagnetic compatibility filter (110) being arranged between the second set of switches (106) of the switch system and the input interface (101). Abstract figure: [Fig. 3],

Description

Title of the invention: Power supply circuit for a rotating electrical machine

[0001] The present application refers to a power supply circuit for a rotating electrical machine for propelling a vehicle, comprising chains of modules.

[0002] In a known example, in particular from application US8395280B2, such a circuit comprises:

[0003] - a polyphase electric machine,

[0004] - an input interface capable of being connected to a charging station,

[0005] - a plurality of chains of electrical modules, the modules comprising:

[0006] - a primary terminal and a secondary terminal, the primary terminal being connected to the secondary terminal of another module and / or the secondary terminal is connected to the primary terminal of another module,

[0007] - an electrical energy storage unit, and

[0008] - an H-shaped switching bridge, the bridge comprising two switching arms comprising two controllable switches arranged on either side of a midpoint, each midpoint being connected to one of the terminals of the module, the electrical energy storage unit being arranged in a branch in parallel with the switching arms,

[0009] - a switch system, comprising a first set of switches allowing for each string to connect it to the terminals of a phase of the electrical machine and a second set of switches allowing for each string to connect it to the input interface, and

[0010] - a control unit, capable of controlling the switches within the electrical circuit.

[0011] Such circuits must comply with regulatory electromagnetic compatibility levels so as not to disturb their electromagnetic environment or not to be disturbed by this environment, in particular when the circuit is connected to a charging station providing an alternating voltage. To comply with these levels, it is known to use an electromagnetic compatibility filter. Judicious placement of this filter in a power supply system employing a plurality of strings is necessary so that the impacts of this said filter are minimal on the voltages generated by the pluralities of strings.

[0012] There is a need to solve this problem.

[0013] The invention achieves this through one of its aspects, thanks to an electrical circuit for powering a rotating electrical machine for propelling a vehicle comprising

[0014] - a polyphase electric machine,

[0015] - an input interface capable of being connected to a charging station,

[0016] - a plurality of chains of electrical modules, the modules comprising:

[0017] - a primary terminal and a secondary terminal, the primary terminal being connected to the secondary terminal of another module and / or the secondary terminal is connected to the primary terminal of another module,

[0018] - an electrical energy storage unit, and

[0019] - an H-shaped switching bridge, the bridge comprising two switching arms comprising two controllable switches arranged on either side of a midpoint, each midpoint being connected to one of the terminals of the module, the electrical energy storage unit being arranged in a branch in parallel with the switching arms,

[0020] - a switch system, comprising a first set of switches allowing for each string to connect it to the terminals of a phase of the electrical machine and a second set of switches allowing for each string to connect it to the input interface, and

[0021] - a control unit, capable of controlling the switches within the electrical circuit,

[0022] Characterized in that the circuit comprises an electromagnetic compatibility filter being arranged between the second set of switches of the switch system and the input interface.

[0023] Placing the electromagnetic compatibility filter near the input interface and connected to the second set of switches of the switch system allows it to be disconnected when the strings of modules supply the phases of the rotating electrical machine. Thus, the impact of the electromagnetic compatibility filter is zero when supplying the electric motor, and the filter does not need to be sized to withstand the current delivered by the strings of modules to the motor.

[0024] According to the invention, the modules are arranged within the chain in such a way that their primary terminal is connected to the secondary terminal of another module and their secondary terminal is connected to the primary terminal of another module, with the exception of a module whose primary terminal is connected to the first terminal of the chain and a module whose secondary terminal is connected to the second terminal of the chain.

[0025] The electromagnetic compatibility filter may comprise a common mode current filter and / or a differential mode current filter.

[0026] These filters make it possible to reduce the impact of electromagnetic interference and to protect the circuit and any charging station connected to the input interface from their effects.

[0027] The electromagnetic compatibility filter may comprise at least one surge protection circuit.

[0028] This protection circuit makes it possible to protect the power supply circuit, for example, when a voltage applied to the terminals of the input interface presents an undesirable voltage peak which could damage the components of the power supply circuit.

[0029] The electromagnetic compatibility filter may comprise a branch connected between the neutral supply of the circuit and the earth, this branch comprising a spark gap and a varistor.

[0030] This branch comprising a varistor and a spark gap, which may for example be a gas spark gap, can divert the current from the circuit to ground, for example when a voltage applied to the terminals of the input interface has an undesirable voltage peak which can damage the components of the power supply circuit, in particular this branch can protect the circuit against lightning. This branch can also limit the leakage current of the circuit below a regulatory threshold.

[0031] The ground may be formed by a vehicle chassis on which the power supply circuit is mounted.

[0032] The first and second terminal of each string can define its unique output voltage.

[0033] This means that there is no intermediate output terminal within the chain, i.e. an output terminal connected both to the primary terminal of a first module and to the secondary terminal of another module in the chain, this primary terminal and this secondary terminal being connected together.

[0034] The energy storage unit within the modules can be arranged in a branch that is devoid of switches. In other words, the electrical energy storage unit is mounted between two nodes of the electrical circuit of the module and is not in series between these two nodes with any switch.

[0035] The modules may comprise a bidirectional switching cell arranged between their primary terminal and their secondary terminal, this switching cell comprising at least one controllable semiconductor switch.

[0036] The presence of this switching cell between the terminals of the modules makes it possible to achieve redundancy when it is desired to disconnect the energy storage unit of one of the modules from the rest of the chain. Thus, if the switching cell of said module is defective, it is possible to disconnect the energy storage unit from this module by controlling the switches of the switching bridge, and if one or more of the switches of the switching bridge are defective, it is possible to functionally disconnect the energy storage unit from the rest of the chain by controlling the switching cell between the terminals of the module. This redundancy can make a circuit using a chain of modules such as described more resistant to malfunctions, extend its service life, and meet a safety requirement for the user of the vehicle.

[0037] The switching cell between the primary terminal and the secondary terminal of the modules may comprise a bidirectional transistor, in particular a four-quadrant GaN-based power transistor.

[0038] Alternatively, the switching cell between the primary terminal and the secondary terminal of the modules may comprise two unidirectional transistors mounted in antiparallel, in particular MOS field effect transistors or bipolar transistors.

[0039] Alternatively, the switching cell between the primary terminal and the secondary terminal of the modules may comprise a microelectromechanical system switch.

[0040] The switching cell between the primary terminal and the secondary terminal is different from a mechanical relay.

[0041] The switches of the switching bridge within the module and the switching cell may be of the same type.

[0042] The first set of switches of the switch system can allow each string to be connected to one of the phases of the electrical machine to which this string is dedicated. In other words, a given string can only be connected to a single phase of the stator of the electrical machine.

[0043] The number of chains may be greater than or equal to the number of phases of the rotating electrical machine.

[0044] The electrical energy storage units contained in the modules of the plurality of strings may have the same nominal voltage of between 3 and 60V. For example, the nominal voltage of the electrical energy storage unit may be 5, 12, 24 or 48V.

[0045] Other nominal voltage values ​​are possible, notably greater than 60V.

[0046] The electrical energy storage unit may be a cell of a lithium-ion type cell battery.

[0047] The circuit control unit may be single or comprise a main control unit and several subsidiary control units, for example one subsidiary control unit per chain in the circuit and / or one subsidiary control unit per module.

[0048] In all of the above, the rotor may be a claw rotor. This rotor then comprises a first and a second nested pole wheels, the first pole wheel defining a series of claws of generally trapezoidal shape, each claw extending axially towards the second pole wheel, the second pole wheel defining a series of claws of generally trapezoidal shape, each claw extending axially towards the first pole wheel. A permanent magnet may be received between two consecutive claws circumferentially speaking for the rotor.

[0049] Alternatively, the rotor may be other than a claw rotor, for example comprising a sheet metal pack or being a cage rotor.

[0050] When the rotating machine is a synchronous machine, it may have a wound rotor or a permanent magnet rotor.

[0051] The rotating electrical machine may have a rated electrical power of 25kW, 100kW, 200kW, or more.

[0052] The circuit control unit may be single or comprise a main control unit and several subsidiary control units, for example one subsidiary control unit per chain in the circuit and / or one subsidiary control unit per module.

[0053] The electrical circuit may be reversible, i.e. the switches within the circuit may be controlled so that the strings of modules supply an alternating voltage across the input interface.

[0054] Advantageously, the aforementioned magnetic compatibility filter is the only electromagnetic compatibility filter of the electrical circuit.

[0055] The invention may be better understood by reading the following description of non-limiting examples of its implementation:

[0056] [Fig.l] represents a module intended to be implemented within a chain of electrical modules of a circuit for the power supply of a rotating electrical machine.

[0057] [Fig.2a] represents a chain of modules according to [Fig.l],

[0058] [Fig.2b] represents an example of output voltage of a string of modules according to [Fig.2a] for the power supply of an electric machine.

[0059] [Fig.2c] represents an example of input voltage of a string of modules according to [Fig.2a] allowing the electrical energy storage units within the modules to be charged.

[0060] [Fig.3] represents a circuit for supplying a rotating electrical machine for propelling a vehicle, using a plurality of module chains according to [Fig.2a] and an electromagnetic compatibility filter.

[0061] [Fig.l] shows a module 10 intended to be implemented within a chain of electrical modules of a circuit for powering a rotating electrical machine.

[0062] The module 10 as shown in [Fig.l] comprises a primary terminal 11a and a secondary terminal 11b, the voltage between terminals 11a and 11b being denoted Vm.

[0063] The module 10 also comprises an electrical energy storage unit 12, of nominal voltage Vc. This electrical energy storage unit may be a cell of a battery employing a plurality of cells, and may have a nominal voltage of between 3 and 60V for example. This energy storage unit 22 is arranged in a branch in parallel with a switching bridge 13, this branch not not comprising switches. This switching bridge 13 is mounted in H and comprises controllable switches 14a, 14b, 14c, 14d, arranged on either side of the midpoints 13a and 13b, these midpoints being connected respectively to the primary terminal 11a and the secondary terminal 11b of the module 10a. In the example shown in [Fig.l], the switches 14a, 14b, 14c, 14d are MOS field effect transistors.

[0064] When a control unit controls the switches of the switching bridge 13 such that the switches 14a, 14d are in the closed position and the switches 14b, 14c are in the open position, the voltage Vm between the terminals 11a and 11b of the module 10 is equal to Vc. When the switches 14b, 14c are in the closed position and the switches 14a, 14d are in the open position, the voltage Vm between the terminals 11a and 11b of the module 10 is equal to -Vc.

[0065] When a control unit drives the switches 14a, 14b to be in the open position and the switches 14c, 14d to the closed position, or drives the switches 14a, 14b to be in the closed position and the switches 14c, 14d to the open position, the voltage Vm between the terminals 11a and 11b of the module 10 is zero, the energy storage unit being functionally disconnected from the terminals 11a and 11b of the module 10.

[0066] In [Fig.2a] a chain 30 of four modules 31, 32, 33, 34 is shown. In this example each module is identical and according to module 10 of [Fig.l]. Modules 31, 32, 33, 34 are chained together by their primary and secondary terminals between the two terminals 37a 37b of the chain. More precisely, module 31 is connected to the first terminal 37a of chain 30 by its primary terminal and to the primary terminal of module 32 by its secondary terminal, module 32 is connected to the primary terminal of module 33 by its secondary terminal, module 33 is connected to the primary terminal of module 34 by its secondary terminal and module 34 is connected to the second terminal 37b of chain 30 by its secondary terminal.

[0067] The chain 30 has a single output voltage which is defined between its two terminals 37a and 37b. Regardless of the value that can be taken by this output voltage, it will be designated Vs hereinafter. In the example shown in Figure 2, the electrical energy storage units within the four modules 31, 32, 33, 34 being identical and of nominal voltage Vc, the voltage Vs can take as a value all the positive or negative integer multiples of Vcentre -4*Vc and 4*Vc when these electrical energy storage units are capable of supplying a voltage.

[0068] [Fig.2b] shows a graph 35 representing an example of alternating voltage Vs generated by the module chain 30 shown in [Fig.2a]. This generated alternating voltage Vs is suitable for powering a rotating electrical machine, it is periodic with period Ti and its shape is comparable to a sine wave.

[0069] At times 0, tb t2, and t3, modules 31, 32, 33, 34 of chain 30 are controlled suc successively so that the voltage between their terminals is equal to Vc, the maximum voltage of the generated alternating voltage Vs between two successive instants becoming equal to Vc, 2* Vc, 3* Vc and 4*VC respectively. By controlling a module, we mean controlling the switches within said module in order to obtain the desired voltage between its terminals.

[0070] At times t4, t5, t6 the modules 31, 32, 33, 34 of the chain 30 are controlled successively so that the voltage between their terminals is equal to 0, the maximum voltage of the generated alternating voltage 35 between two successive times becoming equal to 3*VC, 2* Vc and Vc respectively.

[0071] The time interval between instants 0 and t7 corresponds to the positive part of the period Ti of the alternating voltage 35.

[0072] The order of control of the modules 31, 32, 33, 34 between times 0 and t7 may correspond, for example, to the state of charge of the electrical energy storage unit within the modules 31, 32, 33, 34. In order to balance the state of charge of the energy storage units contained in the modules 31, 32, 33, 34, the modules may, for example, be controlled at times 0, tb t2, and t3 according to the decreasing order of state of charge of their electrical energy storage unit and the increasing order at times t4, t5, t6 and t7. Thus, the storage unit being the most charged among the modules will be discharged for a longer time and the least charged storage unit will be discharged for a shorter time, extending the autonomy of the chain.

[0073] At times t7, t8, t9, and ti0, the modules 31, 32, 33, 34 of the chain 30 are controlled successively so that the voltage between their terminals is equal to -Vc, the maximum voltage of the generated alternating voltage 35 between two successive times becoming equal to -Vc, -2* Vc, -3* Vc and -4*VC respectively. At times tu, ti2, and tn, modules 31, 32, 33, 34 of the chain 30 are controlled successively so that the voltage between their terminals is equal to 0, the maximum voltage of the generated alternating voltage 35 between two successive times becoming equal to -3*VC, -2* Vc and -Vc respectively.

[0074] The time interval between instants t7 and tM corresponds to the negative part of the period Ti of the alternating voltage Vs.

[0075] The order of control of the modules 31, 32, 33, 34 between the times t7 and tn may correspond for example to the state of charge of the electrical energy storage unit within the modules 31, 32, 33, 34, 35. In order to balance the state of charge of the energy storage units contained in the modules 31, 32, 33, 34, the modules may for example be controlled according to the decreasing order of state of charge of their electrical energy storage unit between the times t7, t8, t9, and t10 and the increasing order at the times t1, t12, and t1.

[0076] Between two successive instants, a module can be controlled so that the voltage between its terminals passes successively from Vc to 0 and vice versa during the positive part of the period Ti or -Vc to 0 and vice versa during the negative part of the period Ti. period Ti, for example by pulse width modulation. This reduces harmonic distortions of the generated AC voltage 35.

[0077] The time intervals between two successive instants 0, tl, t2, t3, etc. may be all or partially identical.

[0078] [Fig.2c] shows a graph 37 representing an example of charging of the energy storage units within the modules of the chain 30 shown in [Fig.2a] when an alternating voltage Vs is applied to the terminals of said chain.

[0079] The voltage Vs shown in [Fig.2c] is a sinusoidal alternating voltage suitable for being applied to the terminals 37a 37b of the chain 30 of Figure 2. In the example shown, the voltage Vs has a maximum voltage and a minimum voltage of 4*Vcet and -4*Vcrespectively, and is periodic with a period T2. This alternating voltage can come from a charging station, connected to the terminals of the chain 30.

[0080] In the example shown in [Fig.2c], during the time interval 41 between the instant O and the instant t26, the instants when the voltage Vs is zero, a module of the chain 30, for example the module 31, is controlled so that the voltage between its terminals is equal to Vc. As a result, during the time interval 41 the electrical energy storage unit of the module 31 is charged. During the time interval 42 between the instant t20 and the instant t25, the instants when the voltage 37 is equal to Vc, another module of the chain 30, for example the module 32, is controlled so that the voltage between its terminals is equal to Vc. As a result, during the time interval 42 the electrical energy storage unit of the module 32 is charged.During the time interval 43 between the instant t2i and the instant t24, the instants when the voltage 37 is equal to 2*VC, another module of the chain 30, for example the module 33, is controlled so that the voltage between its terminals is equal to Vc. As a result, during the time interval 43 the electrical energy storage unit of the module 33 is charged. During the time interval 44 between the instant t22 and the instant t23, the instants when the voltage 37 is equal to 3*VC, another module of the chain 30, for example the module 34, is controlled so that the voltage between its terminals is equal to Vc. As a result, during the time interval 44 the electrical energy storage unit of the module 34 is charged.

[0081] Similarly, during the time intervals 45, 46, 47 and 48, during the negative half-period of the period T2 of the alternating voltage Vs, the modules 31, 32, 33, 34 of the chain 30 are successively controlled so that the voltage between their primary and secondary terminals is equal to -Vcentre at the times when the alternating voltage Vs is equal to 0, -Vc, -2*VC and -3*Vc respectively so that their respective electrical energy storage unit is charged during these respective time intervals.

[0082] The control order of the modules 31, 32, 33, 34 may correspond for example to the state of charge of the electrical energy storage unit within the modules 31, 32, 33, 34. In order to balance the state of charge of the electrical energy storage units contained in the modules 31, 32, 33, 34, the modules may for example be charged during the intervals 41, 42, 43, 44 respectively according to the increasing order of state of charge of their electrical energy storage unit. Thus, the most discharged electrical energy storage unit will be charged for a longer time and vice versa. This increasing order may be applied similarly for the intervals 45, 46, 47, 48. Balancing the recharging between the electrical energy storage units makes it possible to reduce the overall recharging time of the chain 30.

[0083] Between two successive instants, a module can be controlled so that the voltage between its terminals changes successively from Vc to 0 and vice versa during the positive part of the period T2 or -Vc to 0 and vice versa during the negative part of the period 36, for example by pulse width modulation. This makes it possible to reduce harmonic distortions when charging the electrical energy storage unit.

[0084] [Fig.3] represents a circuit 100, intended to be integrated within a vehicle with electric propulsion, using chains 30 according to [Fig.2a].

[0085] The circuit 100 comprises an input interface 101. This input interface is intended to be connected for example to a charging station for an electrically powered vehicle, capable of supplying a single- or polyphase alternating electric voltage or a direct voltage.

[0086] In the example shown in [Fig.3], the input interface 101 comprises three terminals lOlx, lOly, lOlz, capable of being connected to a respective phase of a three-phase alternating voltage. The interface 101 comprises an additional terminal lOln capable of being connected to the neutral of an alternating voltage. When a vehicle charging station connected to the input interface supplies a direct voltage or a single-phase alternating voltage, an interconnection circuit (not shown) arranged between this charging station and the input interface 101 of the circuit 100 makes it possible to distribute the voltage supplied to the three terminals lOlx, lOly and lOlz.

[0087] The circuit 100 comprises a rotating electrical machine 102. In the example shown in [Fig.3], the electrical machine 102 is a polyphase machine, comprising three phases, denoted 102x, 102y and 102z.

[0088] A control unit 109 is present in the circuit 100. The control unit 109 may be a processor or an integrated circuit, for example an FPGA or an ASIC, comprising the means for implementing the control functions of the circuit 100 and for controlling the set of switches within the circuit 100.

[0089] The circuit 100 as shown comprises a plurality of chains 103 composed of three chains 30. These three chains are according to the chain 30 shown in [Fig.2a] and are composed of a plurality of electrical modules 10 according to [Fig.l]. In this for example, the chains 30 each comprise four identical modules 10 and according to the module 10 represented in [Fig.l].

[0090] The strings 30 of [Fig.3] can be connected to a respective phase 102x, 102y, 102z of the electrical machine 102 by closing the switches of the plurality of switches 107.

[0091] When the strings 30 are connected to a respective phase 102x, 102y, 102z of the electrical machine 102, the control unit 59 can control the switches of the plurality of strings 103 so that they each supply an alternating voltage to the phases 102x, 102y, 102z of the electrical machine 102. As an example, this supplied voltage can be such as the voltage 35 shown in [Fig.2b], the voltages generated by the strings 30 being able to be phase-shifted by 120 degrees between them.

[0092] When the strings 30 are connected to a respective phase 102x, 102y, 102z of the electrical machine 102, and the electrical machine 102 is generating an alternating voltage, for example during regenerative braking, the control unit 109 can control the switches of the plurality of strings 103 so that the electrical energy storage units of the modules 10 can be recharged from this alternating voltage.

[0093] In the example shown in [Fig. 3], the strings 30 can be connected to a respective terminal lOlx, lOly, lOlz of the input interface by closing the switches of the plurality of switches 106. When they are connected to the input interface, the strings are able to receive an alternating or direct voltage supplied by a charging station connected to the input interface, this alternating or direct voltage supplied by a charging terminal passing through an electromagnetic compatibility filter 110 before powering the strings 30 of the plurality of strings 103.

[0094] In the example shown in [Fig. 3], the circuit 100 is reversible, that is to say that the control unit can control the switches within the circuit in such a way that the chains provide an alternating voltage to the terminals of the input interface 101, this alternating voltage provided by the chains 30 passing through the electromagnetic compatibility filter 110. As an example, the chains can generate a voltage such as the voltage 35 shown in Figure 2, the voltages generated by the chains 30 being able to be phase shifted by 120 degrees between them.

[0095] The electromagnetic compatibility filter 110 shown in [Fig.3] is connected on the one hand to the terminals lOlx, lOly, lOlz and lOln of the input interface 101, and on the other hand to the plurality of switches 106 and the second terminals 36b of the chains 30.

[0096] The electromagnetic compatibility filter 110 comprises two protection circuits between the supply phases 111 and 112. These protection circuits 111 and 112 employ varistors 118, connected between each supply phase, the branches connected respectively to terminals lOlx, lOly and lOlz of the input interface, and the power supply neutral, the branch connected to terminal lOln of the input interface 101. These circuits 111 and 112 make it possible to protect the power supply phases from an overvoltage, for example when a voltage is applied to the circuit 100 of [Fig.3] by a charging station or when the plurality of strings 103 of the circuit 100 supply a voltage to the input interface 101.

[0097] The electromagnetic compatibility filter 110 comprises between the two protection circuits 111 and 112 an electromagnetic emissions filter 113. In the example shown in [Fig. 3], the electromagnetic emissions filter 113 is a common mode current filter. This common mode current filter 113 comprises capacitors 117 connected between the supply phases and the supply neutral, arranged between two groups of coils 116.

[0098] The electromagnetic compatibility filter 110 also comprises an additional branch 114, connected between the supply neutral and the ground, comprising a varistor and a spark gap 120. This branch allows, when a current peak that could potentially damage the circuit 100 or a charging station connected to the terminals of the input interface 101, to be able to divert the current to the ground.

[0099] The invention is not limited to what has been described with reference to the figures.

[0100] The electromagnetic compatibility filter 110 of the circuit 100 may comprise a differential mode current filter in addition to or in replacement of the differential mode current filter 113.

[0101] The control unit 109 may comprise a main control unit and several subsidiary control units, for example a subsidiary control unit per chain 30 and 110, and a subsidiary control unit per module 10, the functions of controlling the circuit and piloting the switches within the circuit being distributed within the main and subsidiary control units.

[0102] All or part of the modules 10 in the circuit 100 may comprise a bidirectional switching cell arranged between their primary terminal 11a and their secondary terminal 11b, this switching cell comprising at least one controllable semiconductor switch. This switching cell makes it possible to functionally disconnect the energy storage unit 12 from the terminals 11a and 11b of a module 10 by being controlled in the closed position. It is also possible to provide redundancy for the disconnection of the energy storage unit 12 from a module 10 by controlling both the switching cell and the switches of the switching bridge 13 in the closed position. This redundancy makes it possible to make a module more resistant to malfunctions, for example to a short circuit of a switch.

[0103] This switching cell may comprise a bidirectional transistor, for example for example, a four-quadrant Gallium Nitride (GaN) power transistor, or two unidirectional transistors connected in antiparallel, for example, MOS field-effect transistors or bipolar transistors, or an electromechanical system switch.

Claims

Claims

1. Electrical circuit (100) for powering a rotating electrical machine (102) for propelling a vehicle comprising: - a polyphase electrical machine (102), - an input interface (101) capable of being connected to a charging station, - a plurality of chains (103) of electrical modules (10), the modules (10) comprising: - a primary terminal (11a) and a secondary terminal (11b), the primary terminal (11a) being connected to the secondary terminal (11b) of another module (10) and / or the secondary terminal (11b) is connected to the primary terminal (11a) of another module (10), - an electrical energy storage unit (12), and - an H-shaped switching bridge (103), the bridge (13) comprising two switching arms comprising two controllable switches (14a, 14b, 14c, 14d) arranged on either side of a midpoint (13a, 13b), each midpoint (13a, 13b) being connected to one of the terminals (11a, 11b) of the module (10),the electrical energy storage unit (12) being arranged in a branch in parallel with the switching arms, - a switch system, comprising a first set of switches (107) allowing for each string (30) to connect it to the terminals of a phase (102x, 102y, 102z) of the electrical machine (102) and a second set of switches (106) allowing for each string (30) to connect it to the input interface (101), and - a control unit (109), capable of controlling the switches within the electrical circuit (100), Characterized in that the circuit (100) comprises an electromagnetic compatibility filter (110) being arranged between the second set of switches (106) of the switch system and the input interface (101).,

2. Circuit (100) according to the preceding claim, the electromagnetic compatibility filter (110) comprising a common mode current filter (113) and / or a differential mode current filter.

3. A circuit (100) according to any preceding claim, the compatibility filter (110) comprising at least one overvoltage protection circuit (111, 112).

4. A circuit (100) according to any preceding claim, the filter electromagnetic compatibility comprising a branch (114) connected between the neutral supply of the circuit and the earth, this branch (114) comprising a spark gap (120) and a varistor (119).

5. A circuit (100) according to any preceding claim, the first (11a) and second terminal (11b) of each chain (30) defining its unique output voltage.

6. Circuit (100) according to any preceding claim, the energy storage unit (12) being arranged in a branch in parallel with the switching arms of the switching bridge (13), this branch being devoid of switches.

7. Circuit (100) according to any preceding claim, all or part of the modules (10) comprising a bidirectional switching cell arranged between their primary terminal (11a) and their secondary terminal (11b), this switching cell comprising at least one controllable semiconductor switch.

8. Circuit (100) according to any preceding claim, the first set of switches (107) of the switch system allowing for each chain (30) to connect it to one of the phases (102x, 102y, 102z) of the electrical machine (102) to which this chain (30) is dedicated.

9. Circuit (100) according to any preceding claim, the number of chains (30) being greater than or equal to the number of phases (102x, 102y, 102z) of the rotating electrical machine (102).

10. Circuit (100) according to any preceding claim, the electrical energy storage units (12) contained in the modules (10) of the plurality of strings (103) having a same nominal voltage between 3 and 60V.

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