SYSTEM FOR CONVERSING A FIRST ELECTRICAL VOLTAGE INTO A SECOND ELECTRICAL VOLTAGE INCLUDING AN ACTIVE POWER FACTOR CORRECTION STAGE

Abstract

The invention relates to a system (2) for converting a first electrical voltage (U1) into a second electrical voltage (U2) comprising an electromagnetic interference filtering stage (4) and an active power factor correction stage (6) connected to the output of the electromagnetic interference filtering stage (4) via at least one main inductor (8), the active power factor correction stage (6) comprising a low-frequency switching electronic branch (16) and at least one high-frequency switching electronic branch (18), the number of high-frequency switching electronic branch(es) (18) being equal to the number of main inductor(s) (8), the electrical conversion system (2) further comprising a saturable inductor (9) with a saturation current threshold,the inductance value of said inductance (9) when it is not saturated being substantially equal to the inductance value of the main inductance (8). Figure from the abstract: Fig. 1,

Description

Title of the invention: SYSTEM FOR CONVERSING A FIRST ELECTRICAL VOLTAGE INTO A SECOND ELECTRICAL VOLTAGE INCLUDING AN ACTIVE POWER FACTOR CORRECTION STAGE

[0001] The invention relates to a system for converting a first electrical voltage into a second electrical voltage, comprising an electromagnetic interference filtering stage and an active power factor correction stage. Preferably, the first electrical voltage is an alternating (preferably sinusoidal) electrical voltage from a single-phase, two-phase, or three-phase power supply network, and the second electrical voltage is a direct current (DC) electrical voltage. The invention also relates to an electric vehicle charger for electric or hybrid vehicles, comprising such an electrical conversion system, as well as to an electric or hybrid vehicle, particularly a motor vehicle, comprising such an electric vehicle charger.

[0002] Electric vehicle chargers for electric or hybrid vehicles, integrated into such a vehicle and intended to be connected to a charging station or charging point, itself connected to a sinusoidal electrical voltage source (such as a single-phase, two-phase, or three-phase power supply) for powering the vehicle, are known in the prior art. Such an electric vehicle charger typically includes a system for converting a first alternating current voltage into a second direct current voltage, as well as a converter configured to convert the second direct current voltage at high frequency into a third direct current voltage (this third direct current voltage serving, for example, as the vehicle's electrical storage battery). The high-frequency converter (typically a chopper) is connected to the output of the conversion system.

[0003] The conversion system typically includes an electromagnetic interference filtering stage and an active power factor correction stage connected at the output of the electromagnetic interference filtering stage via at least one main inductance.

[0004] The electromagnetic interference filtering stage is connected to the sinusoidal electrical voltage source and filters harmonics that generate electromagnetic interference. As known per se, the active power factor correction stage comprises a low-frequency switching electronic branch and at least one high-frequency switching electronic branch. Low frequency corresponds in practice to the frequency of the current supplied by the single-phase, two-phase, or three-phase power grid. The active power factor correction stage allows the system to absorb the most sinusoidal current possible from the power grid, with minimal (preferably zero) phase shift between the fundamental frequency of the absorbed current and the mains voltage. This allows, among other things, a substantial reduction in low-frequency disturbances in the vehicle's power supply current, and therefore a reduction in the harmonic content of this current. The function of this stage is thus to draw an electrical current "Quasi-sinusoidal" using a current feedback loop (implemented primarily via the main inductor). The sinusoidal sampling principle then consists of "forcing" the current flowing in an output bus of the conversion system to follow a rectified sinusoidal reference, by controlling the opening and closing of the power switches controlled in the electronic switching branches. The active power factor correction stage thus supplies a capacitive load as well as the vehicle's battery and actively corrects the current drawn by this load and battery (using the current feedback loop).

[0005] When the sinusoidal electrical voltage source includes a neutral conductor line, the electromagnetic interference filtering stage is equipped with a line connected on one side to this neutral conductor line and on the other side to an intermediate terminal located in the middle of the low-frequency switching electronic branch of the active power factor correction stage. When the active power factor correction stage implements a "mid-tapped, bidirectional synchronous cascode rectifier" topology (also called a totem-pole topology), this low-frequency switching electronic branch allows for the processing of regular alternations in the input electrical voltage signal (both positive and negative alternations), as well as for voltage rectification.The low-frequency switching electronic branch has a switching frequency approximately equal to that of the input power supply (e.g., 50 Hz). The high-frequency switching electronic branch, on the other hand, performs high-frequency switching of the input electrical current, generating an input sinusoidal wave in phase with the input power supply voltage, as well as high-frequency ripples intended to be filtered by the electromagnetic interference filtering stage.

[0006] In the active power factor correction stage, the input electrical current is thus in phase with the input electrical voltage. However, for certain topologies of the active power factor correction stage (including the In a topology of the "mid-tapped, cascode-type, bidirectional synchronous rectifier" type, the input current (from the power supply) is not controlled when the input voltage is close to zero. This is because the operation of the high-frequency switching electronic branch(es) differs depending on the current half-cycles involved. It then becomes necessary to impose a latency time because without it, perfect synchronization between the input current and input voltage around their zero values ​​is impossible (and also to maintain a margin for measurement accuracy when the power supply voltage crosses zero volts).An additional latency is also required to allow the switching of the low-frequency switching electronic branch, the duration of this additional latency being generally shorter than that affecting the high-frequency switching electronic branch(es).

[0007] Several problems are then likely to arise: - First, switching the low-frequency electronic switching branch is likely to cause a sudden voltage change (typically a voltage change of around 400 Vdc or 800 Vdc) on the "neutral" line of the electromagnetic interference filtering stage, which generates significant disturbances within the system; - then all the control electronics of the conversion system (in particular the active power factor correction stage) suffers from significant high-frequency noise, due to the aforementioned abrupt voltage variation of the low-frequency switching electronic branch; - Finally, the presence of the main inductance means that when the input electrical current and the input electrical voltage are close to their zero values, the inductance then plays the role of a passive element which adds to the other passive elements of the electromagnetic interference filtering stage and unbalances the latter.

[0008] These three combined problems generate a significant imbalance within the electromagnetic interference filtering stage, between the phase line(s) and the neutral line. This impairs the performance of the electrical conversion system.

[0009] The object of the invention is to overcome the drawbacks of the prior art by proposing a system for converting a first electrical voltage into a second electrical voltage comprising an electromagnetic interference filtering stage and an active power factor correction stage, which prevents the electromagnetic interference filtering stage from becoming unbalanced when the input electrical current and the input electrical voltage are close to their zero values, as well as to reduce disturbances on the system's neutral line, without affecting the system's nominal behavior when the low-frequency switching electronic branch is not switching.

[0010] To this end, the invention relates, in its broadest sense, to a system for converting a first electrical voltage into a second electrical voltage comprising an electromagnetic interference filtering stage and an active power factor correction stage connected at the output of the electromagnetic interference filtering stage via at least one main inductor, the electromagnetic interference filtering stage being suitable for connection to an alternating electrical voltage source comprising a neutral conductor line and at least one phase conductor line, and having a first output terminal connected to the neutral conductor line and at least one second output terminal connected on the one hand to the main inductor and on the other hand to said at least one phase conductor line,the active power factor correction stage comprising a low-frequency switching electronic branch and at least one high-frequency switching electronic branch, the number of high-frequency switching electronic branches being equal to the number of main inductors, the low-frequency switching electronic branch comprising two low-frequency switching half-branches connected in series at a first intermediate terminal, at least one low-frequency switching half-branch comprising at least one switching element, said first intermediate terminal being connected to the first output terminal of the electromagnetic interference filtering stage, said at least one high-frequency switching electronic branch comprising two high-frequency switching half-branches connected in series at a second intermediate terminal,at least one high-frequency switching half-branch comprising at least one switching element, said at least one second intermediate terminal being connected to the main inductor(s), wherein the electrical conversion system further comprises a saturable inductor with a saturation current threshold, said saturable inductor being connected between the first output terminal of the electromagnetic interference filtering stage and the first intermediate terminal of the active power factor correction stage, the inductance value of said inductor when not saturated being substantially equal to the inductance value of said at least one main inductor.

[0011] Such a saturable inductor, configured and connected in this way in the conversion system, makes it possible to balance the main inductance and to act as an additional filter on the neutral line of the system when the input electrical current and voltage are close to their zero values. Indeed, via such a configuration, the saturable inductance is caused to saturate abruptly if the value of the current flowing through it becomes greater than a current threshold value of the magnetization characteristic of the inductance: the value of this saturated inductance then becomes negligible in the circuit, which does not impact the nominal behavior of the system (current regulated nominally) when the low-frequency switching electronic branch is not switching.Conversely, when the current value falls below the current threshold value of the inductor's magnetization characteristic (in other words, when the input current and voltage are close to zero, and therefore the inductor is not saturated), the saturable inductor exhibits its nominal value (approximately equal to the inductance value of the main inductor) and acts as an additional filter on the system's neutral line. The presence of such a saturable inductor in the electrical conversion system thus mitigates electromagnetic compatibility issues related to the low-frequency switching of the controllable switches in the low-frequency switching electronic branch, without affecting the system's nominal behavior when the low-frequency switching electronic branch is not switching.This results in a completely or almost completely balanced electromagnetic interference filtering stage in terms of filtering.

[0012] Furthermore, compared to using a "conventional" (non-saturable) inductor connected in the same location (i.e., between the first output terminal of the electromagnetic interference filtering stage and the first intermediate terminal of the active power factor correction stage), using a saturable inductor with a saturation current threshold offers the following additional advantages: - a saturable inductor has a reduced volume and is easier to integrate; - a saturable inductance allows the inductance value to be doubled (when it is not saturated), without doubling the size and price of the device; - When the active power factor correction stage has several high-frequency switching electronic branches connected in parallel, the presence of a saturable inductor allows the system to maintain the same behavior as if there were only one high-frequency switching electronic branch (independent branch behavior and control). If the inductor were a "classic" (non-saturable) inductor, it would bind the high-frequency branches by current, which would completely alter the behavior. of the system (behavior and control of non-independent branches) and would in fact make the latter more complex and less efficient; - when the active power factor correction stage has several high-frequency switching electronic branches connected in parallel, a "classic" (non-saturable) inductor should hold the sum of all currents flowing in the high-frequency branches without saturating, and would therefore be much larger in size (and thus more expensive) compared to a saturable inductor.

[0013] According to a particular technical feature of the invention, said saturable inductance comprises a ferromagnetic material in ferrite.

[0014] Advantageously, said saturable inductance has a magnetization characteristic whose current threshold value is substantially equal to 1 A. This allows for rapid saturation of the inductance, while maintaining reasonable dimensions for the latter.

[0015] According to one embodiment of the invention, the active power factor correction stage is a center-tapped, cascode-mounted, bidirectional synchronous rectifier, each low-frequency switching half-branch of the low-frequency switching branch comprising a first switching element, each first switching element comprising a controllable electronic switch and a diode connected in antiparallel to said electronic switch, each high-frequency switching half-branch of said at least one high-frequency switching branch comprising a second switching element, each second switching element comprising a controllable electronic switch and a diode connected in antiparallel to said electronic switch.

[0016] According to a particular technical feature of the invention, each electronic switch comprises a semiconductor electronic switching component, such as a transistor or a thyristor.

[0017] According to a particular technical feature of the invention, the electromagnetic interference filtering stage comprises at least one common-mode filtering element and at least one differential-mode filtering element. The common-mode filtering elements filter the interference between the phase or neutral conductor on the one hand, and the grounding line on the other. The differential-mode filtering elements filter the interference between the phase and the neutral conductor.

[0018] The invention also relates to an electric charger for an electric or hybrid vehicle intended to be connected to a charging station or charging point connected to an alternating current electrical voltage source, for the electrical supply of said electric or hybrid vehicle, the electric charger comprising a system for converting a first electrical voltage into a second electrical voltage such as described above.

[0019] The invention also relates to an electric or hybrid vehicle, in particular an automobile, comprising an electric charger as described above.

[0020] The following are non-limiting examples of embodiments of the present invention, with reference to the single attached figure in which: - [Fig.1] is a schematic representation of an electrical conversion system according to an embodiment of the present invention.

[0021] With reference to [Fig. 1], a system 2 for converting a first electrical voltage U1 into a second electrical voltage U2 is illustrated, according to an embodiment of the invention. The electrical conversion system 2 is connected on the one hand to an alternating electrical voltage source (such as, for example, a single-phase, two-phase, or three-phase power supply network – such a source not being shown in the figure for clarity) providing the first electrical voltage U1, and on the other hand to a load 3 supplying the second electrical voltage U2 between its terminals. The alternating electrical voltage source (preferably sinusoidal) conventionally comprises a neutral conductor NI and at least one phase conductor (in this case, a single phase conductor PI in the particular embodiment illustrated in [Fig. 1], for which the power supply network is a single-phase network).

[0022] The electrical conversion system 2 is typically installed within an electric or hybrid motor vehicle, more precisely within an electric charger intended to be connected to a charging station or charging point, itself connected to the AC power supply for the vehicle (neither the vehicle, nor the charging station or charging point, nor the charger as a whole are shown in the figure for clarity). Preferably, the first electrical voltage Ul is an AC voltage from the single-phase power supply network, and the second electrical voltage U2 is a DC voltage used to power a vehicle's electrical storage battery, after conversion by one or more other stages of the electric charger (such as, for example, a step-down converter).The electrical conversion system 2 thus provides the second DC electrical voltage U2 on an output bus 5 to which the load 3 is connected, the value of this second DC electrical voltage U2 being for example on the order of 400 Vcc or 800 Vcc.

[0023] The electrical conversion system 2 comprises an electromagnetic interference filtering stage 4 and an active power factor correction stage 6 connected to the output of the electromagnetic interference filtering stage 4 via at least one main inductor 8 and one saturable inductor 9 with a saturation current threshold. In the particular embodiment of [Fig. 1], the correction stage The active power factor correction stage 6 is connected to the output of the electromagnetic interference filtering stage 4 via a single main inductor 8 and a saturable inductor 9 with a saturation current threshold. Alternatively, not shown, the active power factor correction stage 6 can be connected to the output of the electromagnetic interference filtering stage 4 via several main inductors 8, each with the same inductance value.

[0024] The electromagnetic interference filtering stage 4 is adapted to be connected to the AC electrical voltage source when the connection between the vehicle's electric charger and the charging station or charging point is made. The electromagnetic interference filtering stage 4 includes a neutral input terminal 10A, at least one phase input terminal 10B, a neutral output terminal 12A, at least one phase output terminal 12B, at least one common-mode filtering element T1, C3, C4, and at least one differential-mode filtering element C1, C2, L1, L2. The electromagnetic interference filtering stage 4 also includes a line 14 connected to earth. In the particular embodiment of [Fig.[l] The electromagnetic interference filtering stage 4 comprises a neutral input terminal 10A, a single phase input terminal 10B (corresponding to the single phase of the single-phase input AC voltage), a neutral output terminal 12A, a single phase output terminal 12B (corresponding to the single phase of the single-phase input AC voltage), three common-mode filtering elements T1, C3, C4, and four differential-mode filtering elements C1, C2, L1, L2. The common-mode filtering elements T1, C3, C4 filter the interference between the phase or neutral on the one hand, and the earth line 14 on the other. The differential-mode filtering elements C1, C2, L1, L2 filter the current ripples generated on the main inductor 8.

[0025] The neutral input terminal 10A is connected to the neutral conductor line NI, and the phase input terminal 10B is connected to the phase conductor line PL. A first differential mode filtering element is a capacitor Cl connected between the neutral input terminal 10A and the phase input terminal 10B. A first common mode filtering element is a decoupling transformer Tl, one terminal of each of the two mutual inductances of which is connected respectively to the neutral input terminal 10A and to the phase input terminal 10B. A second differential mode filtering element is an inductance Ll connected between the other terminal of one of the two mutual inductances of the decoupling transformer Tl, on the one hand, and the phase output terminal 12B, on the other hand.A third differential mode filtering element is an inductor L2 connected between the other terminal of the other mutual inductance of the decoupling transformer T1 on one side, and the neutral output terminal 12A on the other. A fourth differential mode filtering element is a . Capacitor C2 is connected between the neutral output terminal 12A and the phase output terminal 12B. A second common-mode filtering element is capacitor C3, connected between the neutral output terminal 12A and line 14, which is connected to ground. A third common-mode filtering element is capacitor C4, connected between the phase output terminal 12B and line 14, which is connected to ground.

[0026] Thus, the neutral output terminal 12A is connected to the neutral conductor line NI via the inductor L2 and the decoupling transformer Tl, and the phase output terminal 12B is connected to the phase conductor line PI via the inductor L1 and the decoupling transformer Tl. The phase output terminal 12B is further connected to the main inductor 8, and the neutral output terminal 12A is connected to the saturable inductor 9.

[0027] It should be noted that the value of the inductance L1 is equal to the value of the inductance L2, in order to balance the electromagnetic interference filtering stage 4 and not to disturb the action of the first, second and third common mode filtering elements T1, C3, C4.

[0028] The active power factor correction stage 6 comprises a low-frequency switching electronic branch 16 and at least one high-frequency switching electronic branch 18. In the particular embodiment of [Fig. 1], the active power factor correction stage 6 is a center-tapped, cascode-connected, bidirectional synchronous rectifier and comprises a single high-frequency switching electronic branch 18. In an alternative (not shown), the active power factor correction stage 6 could comprise several high-frequency switching electronic branches 18 connected in parallel (regardless of whether the input power supply is single-phase, two-phase, or three-phase). The number of high-frequency switching electronic branches 18 is then equal to the number of main inductors 8.The low-frequency switching electronic branch 16 has a switching frequency substantially equal to that of the input power supply (e.g., 50 Hz). The high-frequency switching electronic branch 18, on the other hand, provides high-frequency switching of the input electrical current, which makes it possible to generate an input sinusoidal wave in phase with the voltage of the input power supply, as well as high-frequency ripples intended to be filtered by the electromagnetic interference filtering stage.

[0029] The low-frequency switching electronic branch 16 comprises two low-frequency switching half-branches 16A, 16B connected in series at a first intermediate terminal 20. The high-frequency switching electronic branch 18 comprises two high-frequency switching half-branches 18A, 18B connected in series at a second intermediate terminal 22. Each switching half-branch The low-frequency 16A, 16B and high-frequency 18A, 18B branches each include a switching element 24. In an alternative (not shown), each half-branch 16A, 16B, 18A, 18B comprises N2 switching elements 24, where N2 is an integer greater than or equal to two. Alternatively, for each low-frequency 16 and high-frequency 18 switching branch, only one half-branch 16A, 16B, 18A, 18B comprises N3 switching elements, where N3 is an integer greater than or equal to one. This alternative corresponds, for example, to a power factor 6 active correction stage with a multi-level structure.The active power factor correction stage 6 also includes means for controlling the switching of the switching elements 24 (at a different switching frequency depending on whether it is the switching elements 24 of the low-frequency electronic switching branch 16 or the switching elements 24 of the high-frequency electronic switching branch 18).

[0030] As is known, each switching element 24 is bidirectional in current and unidirectional in voltage. Each switching element 24 comprises a controllable electronic switch 26 and a diode 28 connected in antiparallel, thus ensuring bidirectional current flow paths. Each switch 26 is, for example, formed by an insulated-gate bipolar transistor, also called an IGBT (Insulated Gate Bipolar Transistor). All IGBTs 26 are, for example, identical. The gate of each IGBT 26 is connected to the aforementioned control means to receive a corresponding control signal.Alternatively, the IGBT 26 transistor is replaced by any semiconductor electronic component comprising one control electrode and two conduction electrodes, such as a bipolar transistor, a field-effect transistor, a thyristor, a gate-extinguishing thyristor, an IGCT (Insulated Gate Commutated Thyristor), or an MCT (MOS Controlled Thyristor) thyristor, for example.

[0031] The first intermediate terminal 20 is connected to the saturable inductance 9 via a first wire link 30. The second intermediate terminal 22 is connected to the main inductance 8 via a second wire link 32. In the variant (not shown in the figures) in which the active power factor correction stage 6 has several high-frequency switching electronic branches 18 connected in parallel, each second intermediate terminal 22 is connected to a separate main inductance 8.

[0032] The control means for the switching elements 24 are configured to control three feedback loops at the level of the high-frequency electronic switching branch 18 and the main inductor 8: a first feedback loop where the electric current is controlled via a current setpoint, a a second control loop where the electrical voltage is controlled via a voltage setpoint, and a third current setpoint control loop, which is driven to be in phase with the voltage of the electrical supply network.

[0033] The inductance value of the saturable inductor 9 when not saturated is chosen to be substantially equal to the inductance value of the main inductor 8. The saturable inductor 9 comprises, for example, a ferromagnetic material such as ferrite. Preferably, the saturable inductor 9 has a magnetization characteristic with a current threshold value substantially equal to 1 A. This allows for rapid saturation of the inductor, while maintaining reasonable dimensions for the inductor (which is advantageous because it allows for a reduction in the size of the system).

[0034] During the operation of the electrical conversion system 2, the saturable inductance 9 is caused to saturate abruptly if the value of the current through it becomes greater than its current threshold value: the value of this inductance 9 thus saturated then becomes negligible in the circuit, which does not impact the nominal behavior of the system 2 (current regulated nominally) when the low frequency switching electronic branch 16 is not switching.Conversely, when the current value becomes less than the current threshold value of the inductor 9 (in other words, when the electrical input current and electrical input voltage of system 2 are close to their zero values, and therefore the inductor 9 is not saturated), the saturable inductor 9 has its nominal value (approximately equal to the inductance value of the main inductor 8) and acts as an additional filter on the neutral line of system 2.

[0035] The electrical conversion system 2 according to the invention makes it possible not to unbalance the electromagnetic disturbance filtering stage 4 when the input electrical current and the input electrical voltage are close to their zero values, as well as to reduce disturbances on the neutral line of the system, and this without affecting the nominal behavior of the system when the low frequency switching electronic branch 16 is not switching.

Claims

Claims

1. System (2) for converting a first electrical voltage (U1) into a second electrical voltage (U2) comprising an electromagnetic disturbance filtering stage (4) and an active power factor correction stage (6) connected to the output of the electromagnetic disturbance filtering stage (4) via at least one main inductor (8), the electromagnetic disturbance filtering stage (4) being suitable for being connected to an alternating electrical voltage source comprising a neutral conductive line (NI) and at least one phase conductive line (PI), and comprising a first output terminal (12A) connected to the neutral conductive line (NI) and at least one second output terminal (12B) connected on the one hand to the main inductor (8) and on the other hand to said at least one phase conductive line (PI),the active power factor correction stage (6) comprising a low-frequency electronic switching branch (16) and at least one high-frequency electronic switching branch (18), the number of high-frequency electronic switching branch(es) (18) being equal to the number of main inductance(s) (8), the low-frequency electronic switching branch (16) comprising two low-frequency half-switching branches (16A, 16B) connected in series at a first intermediate terminal (20), at least one low-frequency half-switching branch (16A, 16B) comprising at least one switching member (24), said first intermediate terminal (20) being connected to the first output terminal (12A) of the electromagnetic interference filtering stage (4), said at least one high-frequency electronic switching branch (18) comprising two high-frequency half-switching branches (18A,18B) connected in series at a second intermediate terminal (22), at least one high-frequency switching half-branch (18A, 18B) comprising at least one switching member (24), said at least one second intermediate terminal (22) being connected to the or one of the main inductance(s) (8), characterized in that the electrical conversion system (2) further comprises a saturable inductance (9) with saturation current threshold, said saturable inductance (9) being connected between the first output terminal (12A) of the electromagnetic disturbance filtering stage (4) and the first intermediate terminal (20) of the active power factor correction stage, (6), the inductance value of said inductance (9) when it is not saturated being substantially equal to the inductance value of said at least one main inductance (8).

2. Electrical conversion system (2) according to claim 1, characterized in that said saturable inductance (9) comprises a ferromagnetic ferrite material.

3. Electrical conversion system (2) according to claim 1 or 2, characterized in that said saturable inductance (9) has a magnetization characteristic whose current threshold value is substantially equal to 1 A.

4. Electrical conversion system (2) according to any one of claims 1 to 3, characterized in that the active power factor correction stage (6) is a bidirectional synchronous rectifier with mid-point cascode assembly, each low-frequency switching half-branch (16A, 16B) of the low-frequency switching branch (16) comprising a first switching member (24), each first switching member (24) comprising a controllable electronic switch (26) and a diode (28) connected in antiparallel to said electronic switch (26), each high-frequency switching half-branch (18A, 18B) of said at least one high-frequency switching branch (18) comprising a second switching member (24), each second switching member (24) comprising a controllable electronic switch (26) and a diode (28) connected in antiparallel to said electronic switch (26).

5. Electrical conversion system (2) according to claim 4, characterized in that each electronic switch (26) comprises a semiconductor electronic switching component, such as a transistor or a thyristor.

6. Electrical conversion system (2) according to any one of claims 1 to 5, characterized in that the electromagnetic disturbance filtering stage (4) comprises at least one common mode filtering member and at least one differential mode filtering member.

7. Electric charger for an electric or hybrid vehicle intended to be connected to a terminal or an electric charging station connected to an alternating electric voltage source, for the electrical supply of said electric or hybrid vehicle, characterized in that it comprises a system (2) for converting a first electric voltage into a

8. second electrical voltage according to any one of claims 1 to 6. Electric or hybrid vehicle, in particular automobile, characterized in that it comprises an electric charger according to claim 7.

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