SYSTEM FOR CONVERTING A FIRST ELECTRICAL VOLTAGE INTO A SECOND ELECTRICAL VOLTAGE COMPRISING 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 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 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 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). Abstract figure: Fig. 1,

Description

Title of the invention: SYSTEM FOR CONVERTING A FIRST ELECTRICAL VOLTAGE INTO A SECOND ELECTRICAL VOLTAGE COMPRISING 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 disturbance filtering stage and an active power factor correction stage. Preferably, the first electrical voltage is an alternating electrical voltage (preferably sinusoidal) from a single-phase, two-phase or three-phase electrical supply network, and the second electrical voltage is a direct electrical voltage. The invention also relates to an electrical charger for an electric or hybrid vehicle, comprising such an electrical conversion system, as well as to an electric or hybrid vehicle, in particular an automobile, comprising such an electrical charger.

[0002] Known in the state of the art are electric chargers for electric or hybrid vehicles, on board such a vehicle and intended to be connected to a terminal or to an electric charging station, itself connected to a sinusoidal electric voltage source (such as a single-phase, two-phase or three-phase electric power supply network) for the electric power supply of the vehicle. Such an electric charger conventionally comprises a system for converting a first alternating electric voltage into a second direct electric voltage, as well as a converter configured to convert at high frequency the second direct electric voltage into a third direct electric voltage (this third direct electric voltage being used for example for an electric storage battery of the vehicle). The high-frequency converter (typically a chopper) is connected to the output of the conversion system.

[0003] The conversion system typically comprises an electromagnetic disturbance filtering stage and an active power factor correction stage connected to the output of the electromagnetic disturbance filtering stage via at least one main inductor.

[0004] The electromagnetic disturbance filtering stage is connected to the sinusoidal electrical voltage source, and makes it possible to filter harmonics generating electromagnetic disturbances. As known per se, the active power factor correction stage comprises a low-frequency electronic switching branch and at least one high-frequency electronic switching branch. The Low frequency corresponds in practice to the frequency of the current supplied by the single-phase, two-phase or three-phase power supply network. The active power factor correction stage makes it possible to absorb a current from the power supply network that is as sinusoidal as possible with a minimal phase shift (preferably zero) between the fundamental of the absorbed current and the mains voltage. This makes it possible, among other things, to substantially reduce low-frequency disturbances in the vehicle's power supply current, and therefore to reduce the harmonic rate in this current. The function of this stage is thus to take an electric current "quasi-sinusoidal" using a current control loop (implemented in particular via the main inductance). The principle of sinusoidal sampling then consists of "forcing" the current flowing in an output bus of the conversion system to follow a rectified sinusoidal reference, by controlling the closing and opening of the power switches controlled in the electronic switching branches. The active power factor correction stage thus delivers power to a capacitive load as well as to the vehicle battery and makes it possible to actively correct the current absorbed by this load and this battery (using the current control loop).

[0005] When the sinusoidal electrical voltage source comprises a neutral conductor line, the electromagnetic disturbance filtering stage is provided with a line connected on the one hand to this neutral conductor line and on the other hand 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 topology of the “mid-point cascode bidirectional synchronous rectifier” type (also called totem-pole topology), this low-frequency switching electronic branch makes it possible to process regular alternations in the input electrical voltage signal (positive and negative alternations), as well as to allow rectification of the voltage.The low-frequency switching electronic branch has a switching frequency substantially equal to that of the input power supply network (for example 50 Hz). The high-frequency switching electronic branch provides high-frequency switching of the input electric current, which makes it possible to generate an input sinusoidal wave in phase with the voltage of the input power supply network, 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 topology of the "mid-point cascode bidirectional synchronous rectifier" type), that the input electric current (from the power supply network) is not controlled when the input electric voltage is close to zero. This comes from the fact that the operation of the high-frequency switching electronic branch(es) is different depending on the current alternations concerned. It then becomes necessary to impose a latency time because without this it is not possible to ensure perfect synchronization between the input electric current and the input electric voltage around their zero values ​​(and also to maintain a margin relative to the accuracy of the measurement when the power supply network voltage passes through zero Volts).An additional latency time is also required to enable the switching of the low-frequency switching electronic branch, the duration of this additional latency time generally being shorter than that(s) affecting the high-frequency switching electronic branch(es).

[0007] Several problems are then likely to appear: - first of all, the switching of the low-frequency switching electronic branch is likely to cause a sudden voltage variation (typically a voltage variation of the order of 400 Vdc or 800 Vdc) on the “neutral” line of the electromagnetic disturbance 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) are subject to significant high-frequency noise, due to the aforementioned sudden voltage variation of the low-frequency switching electronic branch; - finally, the presence of the main inductance means that when the input electric current and the input electric voltage are close to their zero values, the inductance then plays the role of a passive element which is added to the other passive elements of the electromagnetic disturbance filtering stage and unbalances the latter.

[0008] These three cumulative problems cause a significant imbalance within the electromagnetic disturbance filtering stage, between the phase line(s) and the neutral line. This harms the performance of the electrical conversion system.

[0009] The aim 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 disturbance filtering stage and an active power factor correction stage, which makes it possible not to unbalance the electromagnetic disturbance filtering stage 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 neutral line, without affecting the nominal behavior of the system when the low-frequency switching electronic branch is not switching.

[0010] To do this, the invention thus relates, in its broadest sense, to a system for converting a first electrical voltage into a second electrical voltage comprising an electromagnetic disturbance filtering stage and an active power factor correction stage connected to the output of the electromagnetic disturbance filtering stage via at least one main inductor, the electromagnetic disturbance filtering stage being suitable for being connected to an alternating electrical voltage source comprising a neutral conductive line and at least one phase conductive line, and comprising a first output terminal connected to the neutral conductive 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 conductive line,the active power factor correction stage comprising a low-frequency electronic switching branch and at least one high-frequency electronic switching branch, the number of high-frequency electronic switching branch(es) being equal to the number of main inductance(s), the low-frequency electronic switching 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 member, said first intermediate terminal being connected to the first output terminal of the electromagnetic interference filtering stage, said at least one high-frequency electronic switching 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 member, said at least one second intermediate terminal being connected to the or one of the main inductance(s), in which the electrical conversion system further comprises a saturable inductance with saturation current threshold, said saturable inductance being connected between the first output terminal of the electromagnetic disturbance filtering stage and the first intermediate terminal of the active power factor correction stage, the inductance value of said inductance when it is not saturated being substantially equal to the inductance value of said at least one main inductance.

[0011] Such a saturable inductor thus configured and connected in the conversion system makes it possible to balance the main inductor as well as to act as an additional filter on the neutral line of the system when the input electric current and the input electric 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 inductance thus saturated then becomes negligible in the circuit, which does not impact the nominal behavior of the system (nominally regulated current) when the low-frequency switching electronic branch is not switching.Conversely, when the current value becomes lower than the current threshold value of the magnetization characteristic of the inductor (in other words when the input electrical current and the input electrical voltage are close to their zero values, and therefore the inductor is not saturated), the saturable inductor has its nominal value (substantially equal to the inductance value of the main inductor) and acts as an additional filter on the neutral line of the system. The presence of such a saturable inductor in the electrical conversion system thus makes it possible to mitigate the electromagnetic compatibility problems linked to the low-frequency switching of the controllable switches of the low-frequency switching electronic branch, without affecting the nominal behavior of the system 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 that would be connected at 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 has the following additional advantages: - a saturable inductance has a reduced volume and easy integration; - a saturable inductance allows the inductance value to be doubled (when it is unsaturated), without doubling the size and price of the device; - when the active power factor correction stage comprises several high-frequency switching electronic branches connected in parallel, the presence of a saturable inductance makes it possible to maintain the same behaviour for the system as if there were only one high-frequency switching electronic branch (independent behaviour and control of the branches); if the inductance were a “classic” inductance (therefore non-saturable), the latter would link the high-frequency branches by the current, which would completely modify the behaviour 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 would have to hold the sum of all the currents flowing in the high-frequency branches without saturating, and would therefore be much larger in size (and therefore more expensive) compared to a saturable inductor.

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

[0014] Advantageously, said saturable inductance has a magnetization characteristic whose current threshold value is substantially equal to 1 A. This makes it possible to obtain 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 bidirectional synchronous rectifier with a mid-point cascode assembly, each low-frequency switching half-branch of the low-frequency switching branch comprising a first switching member, each first switching member 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 member, each second switching member comprising a controllable electronic switch and a diode connected in antiparallel to said electronic switch.

[0016] According to a particular technical characteristic 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 characteristic of the invention, the electromagnetic disturbance filtering stage comprises at least one common mode filtering member and at least one differential mode filtering member. The common mode filtering members make it possible to filter the disturbances between the phase or the neutral on the one hand, and the earth line on the other hand. The differential mode filtering members make it possible to filter the disturbances between the phase and the neutral.

[0018] The invention also relates to an electric charger for an electric or hybrid vehicle intended to be connected to a terminal or to an electric charging station connected to an alternating electric voltage source, for the electrical supply of said electric or hybrid vehicle, the electric charger comprising a system for converting a first electric voltage into a second electric 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] Embodiments of the present invention will be described below, by way of non-limiting examples, with reference to the single appended figure in which: - [Fig.l] is a schematic representation of an electrical conversion system according to an embodiment of the present invention.

[0021] With reference to [Fig.l] 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 electrical supply network - such a source not being shown in the figure for reasons of clarity) providing the first electrical voltage Ul, and on the other hand to a load 3 delivering between its terminals the second electrical voltage U2. The alternating electrical voltage source (preferably sinusoidal) conventionally comprises a neutral conductive line NI and at least one phase conductive line (in this case a single phase conductive line PI in the particular embodiment illustrated in [Fig.l] for which the electrical 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 electrical charger intended to be connected to an electrical charging terminal or station, itself connected to the AC electrical voltage source, for the electrical supply of the vehicle (neither the vehicle, nor the charging terminal or station, nor the charger as a whole being shown in the figure for reasons of clarity). Preferably, the first electrical voltage Ul is an AC electrical voltage from the single-phase electrical supply network, and the second electrical voltage U2 is a DC electrical voltage making it possible to supply an electrical storage battery of the vehicle, after transformation by one or more other stage(s) of the electrical charger (such as for example a step-down chopper).The electrical conversion system 2 thus provides the second direct electrical voltage U2 on an output bus 5 to which the load 3 is connected, the value of this second direct electrical voltage U2 being for example of the order of 400 Vdc or 800 Vdc.

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

[0024] The electromagnetic disturbance filtering stage 4 is adapted to be connected to the alternating electric voltage source, when the connection between the electric charger of the vehicle and the electric charging terminal or station is made. The electromagnetic disturbance filtering stage 4 comprises 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 member T1, C3, C4, and at least one differential mode filtering member C1, C2, L1, L2. The electromagnetic disturbance filtering stage 4 also comprises a line 14 connected to the ground. In the particular embodiment of [Fig.l], the electromagnetic disturbance filtering stage 4 comprises a neutral input terminal 10A, a single phase input terminal 10B (corresponding to the single phase of the input single-phase alternating voltage), a neutral output terminal 12A, a single phase output terminal 12B (corresponding to the single phase of the input single-phase alternating voltage), three common mode filtering members Tl, C3, C4, and four differential mode filtering members C1, C2, Ll, L2. The common mode filtering members Tl, C3, C4 make it possible to filter the disturbances between the phase or the neutral on the one hand, and the earth line 14 on the other hand. The differential mode filtering members C1, C2, Ll, L2 make it possible to filter the current ripples generated on the main inductance 8. .

[0025] The neutral input terminal 10A is connected to the neutral conductive line NI, and the phase input terminal 10B is connected to the phase conductive line PL. A first differential mode filtering member is a capacitor C1 connected between the neutral input terminal 10A and the phase input terminal 10B. A first common mode filtering member is a decoupling transformer T1, one of the terminals 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 member is an inductance L1 connected between the other terminal of one of the two mutual inductances of the decoupling transformer T1 on the one hand, and the phase output terminal 12B on the other hand.A third differential mode filtering member is an inductor L2 connected between the other terminal of the other mutual inductor of the decoupling transformer T1 on the one hand, and the neutral output terminal 12A on the other hand. A fourth differential mode filtering member is a . capacitor C2 connected between the neutral output terminal 12A and the phase output terminal 12B. A second common mode filtering device is a capacitor C3 connected between the neutral output terminal 12A and the line 14 connected to ground. A third common mode filtering device is a capacitor C4 connected between the phase output terminal 12B and the line 14 connected to ground.

[0026] Thus, the neutral output terminal 12A is connected to the neutral conductive line NI via the inductor L2 and the decoupling transformer T1, and the phase output terminal 12B is connected to the phase conductive line PI via the inductor L1 and the decoupling transformer T1. 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 disturbance filtering stage 4 and not to disturb the action of the first, second and third common mode filtering members 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.l], the active power factor correction stage 6 is a bidirectional synchronous rectifier with a mid-point cascode assembly and comprises a single high-frequency switching electronic branch 18. In a variant not shown, the active power factor correction stage 6 could comprise several high-frequency switching electronic branches 18, connected in parallel (and this, whether the input electrical power supply network 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 inductances 8.The low-frequency switching electronic branch 16 has a switching frequency substantially equal to that of the input electrical power supply network (for example 50 Hz). The high-frequency switching electronic branch 18 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 electrical power supply network, as well as high-frequency ripples intended to be filtered by the electromagnetic disturbance 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 low frequency 16A, 16B and high frequency 18A, 18B comprises a switching member 24. In a variant not shown, each half-branch 16A, 16B, 18A, 18B comprises a number N2 of switching members 24, N2 being an integer greater than or equal to two. In a further variant, for each low frequency 16 and high frequency 18 switching branch, only one half-branch 16A, 16B, 18A, 18B comprises a number N3 of switching members, N3 being an integer greater than or equal to one. This variant corresponds for example to an active power factor correction stage 6 whose structure is of the multi-level type.The active power factor correction stage 6 also comprises means for controlling the switching of the switching members 24 (at a different switching frequency depending on whether they are the switching members 24 of the low-frequency electronic switching branch 16 or the switching members 24 of the high-frequency electronic switching branch 18).

[0030] As known per se, each switching member 24 is bidirectional in current and unidirectional in voltage. Each switching member 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 from an insulated gate bipolar transistor, also called an IGBT transistor (from the English “Insulated Gate Bipolar Transistor”). All the IGBT transistors 26 are, for example, identical. The gate of each IGBT transistor 26 is connected to the aforementioned control means to receive a corresponding control signal.Alternatively, the IGBT transistor 26 is replaced by any semiconductor electronic component comprising a control electrode and two conduction electrodes, such as a bipolar transistor, a field effect transistor, a thyristor, a gate-switched thyristor, an IGCT thyristor (from the English "Insulated Gate Commutated Thysistor"), or an MCT thyristor (from the English "MOS Controlled Thyristor") for example.

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

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

[0033] The inductance value of the saturable inductor 9 when it is 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 ferrite material. Preferably, the saturable inductor 9 has a magnetization characteristic whose current threshold value is substantially equal to 1 A. This makes it possible to obtain rapid saturation of the inductor, while maintaining reasonable dimensions for the latter (which is advantageous because it makes it possible to reduce the size of the system).

[0034] During operation of the electrical conversion system 2, the saturable inductance 9 is caused to saturate suddenly if the value of the current flowing 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 in a nominal manner) when the low-frequency electronic switching branch 16 is not switching.Conversely, when the current value becomes lower than the current threshold value of inductance 9 (in other words when the input electrical current and the input electrical voltage of system 2 are close to their zero values, and therefore inductance 9 is not saturated), saturable inductance 9 has its nominal value (substantially equal to the inductance value of main inductance 8) and plays the role of 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 the disturbances on the neutral line of the system, and this without affecting the nominal behavior of the system when the low-frequency electronic switching 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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