ISOLATED VOLTAGE CONVERTER

Abstract

This isolated voltage converter (106) comprises: - first and second global input terminals (P, N) intended to receive a global input voltage (VE); and - first and second voltage conversion modules (1081, 1082), each with an isolated primary and secondary circuit connected by a magnetic circuit, the primary circuits being connected in series between the global input terminals (P, N) to each receive, as a local input voltage (VE1, VE2), only a portion of the global input voltage (VE). It further comprises a device (118) for regulating the local input voltages (VE1, VE2) to maintain them within a predefined ratio, for example, to keep them equal. Figure for the abbreviation: Fig. 1

Description

Title of the invention: ISOLATED VOLTAGE CONVERTER Technical field of the invention

[0001] The present invention relates to an isolated voltage converter and a motor vehicle comprising such an isolated voltage converter. Technological background

[0002] The French patent application published under number FR 3 064 832 A1 describes an isolated voltage converter comprising: - first and second global input terminals for receiving a global input voltage; and - a first and a second voltage conversion module each comprising an isolated primary circuit and a secondary circuit connected by a magnetic circuit, the primary circuit of the first voltage conversion module and the primary circuit of the second voltage conversion module being designed to be connected in series between the global input terminals to each receive, as local input voltage, only a part of the global input voltage.

[0003] More specifically, in patent application FR 3 064 832 A1, the voltage converter is a DC-DC voltage converter, preceded by an AC-DC voltage converter intended to be connected to a single-phase or three-phase AC electrical network. It is planned to leave the two modules in series when the electrical network is three-phase and to short-circuit one of the modules when the electrical network is single-phase.

[0004] This known voltage converter has the disadvantage that an imbalance can occur leading to the majority of the voltage conversion being carried out by only one of the modules, which can damage it if it is not sized to receive such electrical power.

[0005] It may thus be desirable to provide a voltage converter which makes it possible to overcome at least some of the aforementioned problems and constraints. Summary of the invention

[0006] An isolated voltage converter is therefore proposed comprising: - first and second global input terminals for receiving a global input voltage; and - a first and a second voltage conversion module each comprising an isolated primary circuit and a secondary circuit connected by a magnetic circuit, the primary circuit of the first voltage conversion module and the primary circuit of the second voltage conversion module being adapted to be connected in series between the global input terminals to each receive, as local input voltage, only a part of the global input voltage; the isolated voltage converter being characterized in that it further comprises a device for regulating the local input voltages to maintain them in a predefined ratio, for example to keep them equal to each other, when the primary circuits are connected in series.

[0007] Thus, thanks to the invention, the regulation device prevents one module from taking precedence over the other.

[0008] Optionally, the primary circuits of the voltage conversion modules each comprise at least one semiconductor switch and the regulating device is designed to control the semiconductor switches so as to maintain the local input voltages within the predefined ratio. Thus, the regulation of the local input voltages can easily be implemented.

[0009] Also optionally, the regulating device is designed to determine, from a difference between the local input voltages, a compensation and to control one of the voltage conversion modules from an electrical setpoint reduced by the compensation and the other of the voltage conversion modules from the same setpoint increased by the compensation. Thus, it is possible to regulate the local input voltages at the same time from a single compensation loop.

[0010] Also optionally, the regulating device is designed to determine the electrical setpoint from a difference between an output voltage of the isolated voltage converter and an output voltage setpoint. Thus, the output voltage is regulated at the same time as the local input voltages.

[0011] Also optionally, the electrical setpoint is a current setpoint and the compensation is a current compensation. Indeed, the modules generally already include current regulation functional blocks. For example, it is also possible to monitor this current to detect faults in the voltage converter. Thus, it is possible to reuse these functional blocks to regulate the local input voltages. In addition, current regulation can improve the dynamic performance of the voltage converter.

[0012] Also optionally, the primary circuit of each of the voltage conversion modules comprises two switches arranged as switching arms between two input terminals of the voltage conversion module in question and the regulation device is designed to control the two switching arms according to the same switching period and according to a duty cycle so as to maintain said local input voltages in the predefined ratio, and by shifting the commands of one of the switching arms by 45% to 55%, preferably 50%, of the switching period relative to the commands of the other switching arm. This shifting of the commands makes it possible to increase the noise frequency and to compensate for the disturbance currents.

[0013] Also optionally, the voltage converter further comprises a reconfiguration device designed to selectively connect the primary circuits in series, and connect the primary circuit of the first voltage conversion module between the two global input terminals so that its input voltage is equal to the input voltage.

[0014] Also optionally, the reconfiguration device is designed to selectively connect the primary circuits of the voltage conversion modules in parallel with each other between the global input terminals so that each local input voltage is equal to the global input voltage. Thus, both modules are always used to perform the voltage conversion.

[0015] Also optionally, the reconfiguration device is designed to connect the primary circuit of the first voltage conversion module between the two global input terminals to deactivate the second voltage conversion module. Indeed, the modules are generally designed to have their best performance at high power, for example between 50% and 100% of the nominal power. Thus, deactivating the second module increases the chances that the first module operates in its best performance range. On the contrary, if the modules operated in parallel, they would each risk operating outside their best performance range.

[0016] Also optionally, the reconfiguration device is designed to place the primary circuits of the voltage conversion modules in series when the overall input voltage is in a first predefined voltage range and to connect the primary circuit of the first voltage conversion module between the two global input terminals when the overall input voltage is in a second predefined voltage range, lower than the first predefined voltage range. Thus, the local input voltages are limited and do not take on excessively high values.

[0017] Also optionally, the first and second voltage conversion modules are DC-DC conversion modules.

[0018] Also optionally, the secondary circuits of the first and second voltage conversion modules are connected in parallel with each other at the output of the isolated voltage converter.

[0019] A motor vehicle comprising a voltage converter is also proposed. according to the invention. Brief description of the figures

[0020] The invention will be better understood with the aid of the following description, given solely by way of example and with reference to the appended drawings in which:

[0021] [Fig-1] [Fig.l] is an electrical diagram of an electrical system comprising a first example of a voltage converter according to the invention,

[0022] [Fig.2] [Fig.2] is an electrical diagram of one of two conversion modules of voltage of the voltage converter of [Fig.l],

[0023] [Fig.3] [Fig.3] is an automatic regulation diagram implemented by a control device of the two voltage conversion modules,

[0024] [Fig.4] [Fig.4] is an electrical diagram of an electrical system comprising a second example of a voltage converter according to the invention,

[0025] [Fig.5] [Fig.5] is an electrical diagram of an electrical system comprising a third example of a voltage converter according to the invention, and

[0026] [Fig.6] [Fig.6] groups together timing diagrams of control switches of the voltage conversion modules. Detailed description of the invention

[0027] With reference to [Fig.l], an electrical system 100 implementing the invention will now be described.

[0028] The electrical system 100 firstly comprises an electrical network 102 designed to deliver a network voltage VE. In the example described, the electrical network 102 is continuous, so that the network voltage VE is continuous.

[0029] The electrical system 100 further comprises a load 104 (such as a low-voltage network) and an isolated voltage converter 106 intended to be connected to the electrical network 102 to convert the network voltage VE into an output voltage Vs for supplying the load 104. In the example described, the voltage converter 106 is a DC-DC converter, so that the output voltage Vs is DC. Furthermore, the network voltage VE is for example a high voltage (i.e. for example a voltage greater than 60 V), while the supply voltage Vs is a low voltage (i.e. for example a voltage less than 60 V). For example, the network voltage VE is between 100 V and 900 V, while the supply voltage Vs is between 10 V and 50 V, generally equal to 14 V or 48 V.

[0030] The network voltage VE received by the voltage converter 106 can take very different values. This may come from the fact that the voltage converter 106 is intended to be successively connected to different electrical networks 102 and / or from the fact that the same electrical network 102 may see its network voltage VE vary during time, for example depending on the operating mode of the electrical network 102. For example, when the electrical network 102 comprises one or more batteries intended to provide a voltage of 400 V, the network voltage VE can in fact vary between 170 V and 450 V depending on the charge of the battery(ies). When the electrical network 102 comprises one or more batteries intended to provide a voltage of 800 V, the network voltage VE can in fact vary between 470 V and 850 V depending on the charge of the battery(ies). This is why the voltage converter 106 is preferably a DC voltage converter, designed to provide a substantially constant output voltage Vs over a whole range of possible network voltages VE.

[0031] The voltage converter 106 has first and second input terminals P, N between which the electrical network 102 is connected to deliver its network voltage VE between the terminals P, N.

[0032] The voltage converter 106 further comprises first and second voltage conversion modules 108i, 1082. In the example described, these modules 1081, 1082 are DC-DC converters. Preferably, the modules 1081 and 1082 are substantially identical. The modules 1081, 1082 preferably comprise semiconductor switches.

[0033] The modules 1081, 1082 are for example connected to the load 104 in parallel with each other. Thus, they each provide the output voltage Vs.

[0034] Each module 1081, 1082 has first and second input terminals Pb Ni, respectively P2, N2. In the example described, the input terminal Pi of the module 1081 is connected to the input terminal P of the voltage converter 106 and the input terminal Ni of the module 1081 is connected to the input terminal P2 of the module 1082.

[0035] The voltage converter 106 further comprises a device 110 for reconfiguring the connection of the modules 1081, 1082 to the electrical network 102. More precisely, the reconfiguration device 110 is designed to selectively: (i) connect the modules 108b 1082 in series between the input terminals P, N to each receive, as input voltage VEb VE2, only a portion of the network voltage VE, and (ii) connect the module 1081 between the two input terminals P, N so that its input voltage VE1 is equal to the network voltage VE. In the example described, in the latter case, the module 1082 is deactivated, so that only the module 1081 performs the voltage conversion.

[0036] To switch from one connection configuration to another, the reconfiguration device 110 controls, for example, a switch 112 designed to connect the input terminal N selectively to the input terminal Ni of the module 1081 and to the input terminal N2 of the module 1082. Thus, when the switch 112 connects the input terminal N to the input terminal Ni of the module 1081, the latter is connected between the two input terminals P, N so that its input voltage VEi is equal to the network voltage VE. The input terminal N2 of the module 1082 then has a floating potential, so that the module 1082 is disconnected from the electrical network 102 and therefore inactive. When the switch 112 connects the input terminal N to the input terminal N2 of the module 1082, the modules 1081, 1082 are then connected in series between the input terminals P, N to each receive, as input voltage VE1, VE2, only a part of the network voltage VE. More precisely, in the example described, the network voltage VE is equal to the sum of the input voltages VE1, VE2.

[0037] The voltage converter 106 further comprises, still in the example described, a device 114 for measuring the network voltage VE and the reconfiguration device 110 is designed to control the switch 112 as a function of the measured network voltage VE. For example, the reconfiguration device 110 is designed to determine in which of two predefined voltage intervals the input voltage VE lies. Preferably, these two predefined intervals do not overlap. In the example described, the first interval corresponds to the possible network voltages VE for a 400 V electrical network (i.e. for example 170 - 450 V) and the second interval corresponds to the possible network voltages VE for an 800 V electrical network (i.e. for example 470 - 850 V). For example, the measured input voltage VE can be compared to a predefined threshold making it possible to distinguish the two intervals.In the example described, this threshold could be between 450 V and 470 V.

[0038] The reconfiguration device 110 is then, for example, designed to control the switch 112 to connect the module 1081 between the two input terminals P, N when the network voltage VE belongs to the interval grouping the smallest voltages (the interval 170 - 450 V in the example described) and to connect the modules 108i, 1082 in series between the input terminals P, N when the network voltage VE belongs to the interval grouping the highest voltages (the interval 470 - 850 V in the example described).

[0039] In the example described where the modules 1081, 1082 comprise semiconductor switches, the voltage converter 106 further comprises a device 118 for controlling these switches, in order for example to maintain the output voltage Vs equal to a setpoint Vs*.

[0040] Even if the modules 1081, 1082 are intended to be identical, there are still differences between the components, resulting for example from manufacturing tolerances. For this reason, when the modules 1081, 1082 are connected in series, there is a risk that one of the modules 1081, 1082 will take over from the other and perform all the voltage conversion. To avoid this, it is proposed to seek to keep the input voltages VEi, VE2 equal.

[0041] Thus, the voltage converter 106 further comprises a device for regulating the input voltages VEb VE2 of the modules 1081, 1082, when the latter are connected in series, in order to seek to maintain these input voltages VE1, VE2 equal, in particular within an uncertainty. For example, the voltage converter 106 comprises devices 120 for measuring the input voltages VE1, VE2 and the regulation device is designed to regulate the input voltages VE1, VE2 from their measurements.

[0042] Still for example, the regulating device is designed to control at least some of the semiconductor switches of the modules 1081, 1082, from the measured input voltages VE1, VE2. In the example described, the regulating device is implemented by the control device 118. An example of such a control device 118 will be described in more detail later, with reference to [Fig. 3].

[0043] With reference to [Fig. 2], an exemplary embodiment of the module 1082 will now be described. The module 1081 is similar and comprises substantially identical components, which will be designated hereinafter with the index “1” rather than the index “2” used for the components of the module 1082.

[0044] The module 1082 firstly comprises an input capacitor CE2 connected between the terminals P2, N2 to smooth the input voltage VE2.

[0045] The module 1082 further comprises a first voltage converter 2022 designed to convert the input voltage VE2 into a continuous intermediate voltage ViNT2.

[0046] The voltage converter 2022 comprises a switching arm comprising two semiconductor switches QA2, QB2 connected between the input terminals P2, N2 and to each other at a midpoint. Each of the semiconductor switches QA2, QB2 is for example a metal-oxide-semiconductor field effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT).

[0047] The voltage converter 2022 further comprises an inductance L2 and a capacitor C1NT2 connected one after the other between the midpoint of the switching arm QA2, QB2 and the input terminal N2. The intermediate voltage V1NT2 is thus the voltage across the capacitor C1NT2.

[0048] The module 1082 further comprises a second voltage converter 2042 designed to convert the intermediate voltage V1NT2 into the output voltage Vs.

[0049] The voltage converter 2042 comprises in particular a galvanic isolation barrier 2062 comprising a magnetic circuit 2082 which, in the example described, couples one or more primary windings 2102 and one or more secondary windings 2122 together.

[0050] In the example described, the voltage converter 2042 is a so-called “fly ward” converter described for example in detail in the French patent application published under the number FR 3 056 038 AL In a converter of this type, two semiconductor switches QC2, QD2 connected to each other by a middle capacitor CE2, the assembly being connected to the terminals of the intermediate capacitor C1NT2 to receive the intermediate voltage V1NT2. Each of the semiconductor switches QC2, QD2 comprises for example a MOSFET or an IGBT.

[0051] The voltage conversion module 1082 thus has a primary circuit 2142 and a secondary circuit 2162 that are isolated, connected by the magnetic circuit 2082. The primary circuit 2142 includes in particular the terminals P2, N2 for receiving the local input voltage VE2. In the example described, the primary circuit 2142 includes the voltage converter 2022, the components of the voltage converter 2042 connected between the voltage converter 2022 and the primary winding(s) 2102, and this or these primary winding(s) 2102. For its part, the secondary circuit 2162 includes the components of the voltage converter 2042 connected between the secondary winding(s) and output terminals 2182 of the voltage conversion module 1082.

[0052] With reference to [Fig. 3], an exemplary control device 118 will now be described in more detail.

[0053] The control device 118 firstly comprises a comparator 302 designed to determine a difference AVS between the measured output voltage Vs and an output voltage setpoint Vs*.

[0054] The control device 118 further comprises a regulator 304 designed to determine a so-called initial electrical setpoint from the AVS deviation. In the example described, the initial electrical setpoint is a current setpoint I*.

[0055] The control device 118 further comprises a comparator 306 designed to determine a difference AVE between the input voltages VE1, VE2.

[0056] The control device 118 further comprises a regulator 308 designed to determine a compensation from the deviation AVE. In the example described, the compensation Icomp is a current compensation.

[0057] The control device 118 further comprises, for the control of one of the modules (the module 108i in the example described), a subtractor 310 designed to reduce the setpoint I* of the compensation IComp to provide a so-called final setpoint Ii* for this module 1081. In the example described, this final setpoint h* is a current setpoint for the current flowing in the inductance of the module considered (the inductance Li in the example described).

[0058] The control device 118 further comprises, for the control of the other of the modules (the module 1082 in the example described), an adder 312 designed to increase the initial setpoint I* of the compensation Icomp to provide a so-called final setpoint I*2 for this module 1082. In the example described, this final setpoint I2* is a current setpoint for the current flowing in the inductance of the module considered (the inductance L2 in the example described).

[0059] For the control of the module 108b, the control device 118 further comprises a comparator 314 designed to determine a difference Ali between the measured current Ii and the final setpoint I*i and a device 316 designed to determine commands for the switches QAb QBi of the module 1081 from this difference AIb

[0060] Similarly, for the control of the module 1082, the control device 118 further comprises a comparator 318 designed to determine a difference AI2 between the measured current I2 and the final setpoint I*2 and a device 320 designed to determine commands for the switches QA2, QB2 of the module 1082 from this difference AI2.

[0061] The commands are for example in the form of pulse width modulation (PWM) signals having a duty cycle determined as a function of the deviation Ali or AI2, depending on the device 316 or 320 considered.

[0062] The devices 316, 320 may further be designed to determine commands for the switches QCb QDb respectively QC2, QD2. These commands are for example also PWM signals, but whose duty cycle is fixed (in particular, independent of the deviation AL or AI2).

[0063] Each of the regulators 304, 308 is for example one of: a PID regulator, a PI regulator and a non-linear regulator.

[0064] With reference to [Fig.4], another example 402 of a voltage converter according to the invention will now be described.

[0065] This voltage converter is similar to that of [Fig. 1], except that it does not include the switch 112.

[0066] In this embodiment, terminal N2 of module 1082 is connected to terminal N. Furthermore, the reconfiguration device 110 is then, for example, designed to control, for example independently of the commands of the control device 118, the switching arm QA2, QB2 to short-circuit the terminals P2, N2 when the network voltage VE belongs to the interval grouping the smallest voltages (the interval 170 - 450 V in the example described) and to let the control device 118 control the switches QA2, QB2 so that the module 1082 performs the desired voltage conversion, in series with the module 108b when the network voltage VE belongs to the interval grouping the highest voltages (the interval 470 - 850 V in the example described).

[0067] With reference to [Fig.5], another example 502 of a voltage converter according to the invention will now be described.

[0068] This embodiment is similar to that of [Fig.l], except that the switch 112 is replaced by a switch 504 designed to selectively connect the two modules 1081, 1082 in series and in parallel to the electrical network 102. In the parallel configuration, each input voltage VE1, VE2 is thus equal to the network voltage VE.

[0069] In the example described, terminal Pi of module 1081 is connected to terminal P and terminal N2 of module 1082 is connected to terminal N. Thus, to switch from one configuration to the other, switch 504 is designed to change the connection of terminals Ni, P2. More specifically, in the example described, for the parallel configuration, switch 504 is designed to connect terminal P2 to terminal P and terminal Ni to terminal N. For the series configuration, switch 504 is designed to connect terminals Ni and P2 together.

[0070] The reconfiguration device 110 is then, for example, designed to control the switch 504 to connect the two modules 108b 1082 in parallel between the two input terminals P, N when the network voltage VE belongs to the interval grouping the smallest voltages (the interval 170 - 450 V in the example described) and to connect the modules 108b 1082 in series between the input terminals P, N when the network voltage VE belongs to the interval grouping the highest voltages (the interval 470 - 850 V in the example described).

[0071] With reference to [Fig.6], timing diagrams illustrating examples of controls of the switches QAb QA2, QCb QC2 will now be described. On these timing diagrams, the abscissa represents the time in milliseconds and the ordinate the control voltage in volts.

[0072] The commands of the switches QBb QB2, QDb QD2 are not shown because they are deduced from the commands of the switches QAb QA2, QCh QC2: the switches QBi, QB2 are respectively commanded in opposition to the switches QA b QA2 (preferably with a dead time) and the switches QDb QD2 are respectively commanded in opposition to the switches QCb QC2 (preferably with a dead time).

[0073] As can be seen in the first timing diagram, the command C_QA2 of the switch QA2 alternates between two values, respectively opening and closing, according to a period TB equal to the inverse of a switching frequency FB. In the example described, this switching frequency FB is fixed and predefined and the control device 118 is designed to determine a duty cycle of the command C_QA2 from the local input voltages VEb VE2, to maintain the latter in the predefined ratio. As illustrated in [Fig. 3], in the example described, the duty cycle of the command C_QA2 is determined by the device 320 from the difference AI2.

[0074] Similarly, as can be seen in the second timing diagram, the C_QAi command of the QAi switch alternates between two values ​​respectively of opening and closing according to the period TB. In the example described, the control device 118 is designed to determine a duty cycle of the C_QAi command from the local input voltages VE1, VE2, to maintain the latter in the predefined ratio. As illustrated in [Fig.3], in the example described, the duty cycle of the C_QAi command is determined by the device 316 from the deviation Afp

[0075] Furthermore, preferably, the commands of one of the switching arms are offset by 45% to 55%, preferably 50%, of the switching period TB relative to the commands of the other switching arm. This is illustrated in [Fig.6] by the double arrow TB / 2.

[0076] As can be seen in the third and fourth timing diagrams, the commands C_QCi, C_QC2 of the switches QCi, QC2 alternate between two values ​​respectively of opening and closing according to a switching period TF. In the example described, this switching period TF is fixed and the commands C_QCi, C_QC2 have equal and fixed duty cycles.

[0077] Furthermore, preferably, the commands of one of the pairs of switches (the pair QC 2, QD2 in the example described) are offset by 20% to 30%, preferably 25%, of the switching period TF relative to the commands of the other pair of switches (the pair QCi, QDi in the example described). This is illustrated in [Fig.6] by the double arrow TF / 4.

[0078] It is clear that a voltage converter such as those described above makes it possible to maintain the operation of the modules in balance.

[0079] It will also be noted that the invention is not limited to the embodiments described above. It will indeed appear to those skilled in the art that various modifications can be made to the embodiments described above, in light of the teaching which has just been disclosed to them.

[0080] For example, the offset of approximately 25% is valid in the case where the second voltage converter 204b 2042 is of the flyward type. For other types of converters, the offset could be different. For example, it could be between 45% and 55%, preferably 50%, for a phase shift converter or for a resonant LLC converter.

[0081] In the detailed presentation of the invention which is made above, the terms used must not be interpreted as limiting the invention to the embodiments set out in the present description, but must be interpreted to include all equivalents whose prediction is within the reach of those skilled in the art by applying their general knowledge to the implementation of the teaching which has just been disclosed to them.

Claims

Claims

1. Isolated voltage converter (106; 402; 502) comprising: - first and second global input terminals (P, N) intended to receive between them a global input voltage (V e); and - a first and a second voltage conversion module (108i, 1082) each comprising a primary circuit (2142) and a secondary circuit (2162) isolated connected by a magnetic circuit (2082), the primary circuit of the first voltage conversion module (1081) and the primary circuit (2142) of the second voltage conversion module (1082) being adapted to be connected in series between the global input terminals (P, N) to each receive, as local input voltage (V ei, VE2), only a part of the global input voltage (V e); and - a device (118) for regulating the local input voltages (VEi, VE2) to maintain them in a predefined ratio, for example to maintain them equal to each other, when the primary circuits (2142) are connected in series; and - a reconfiguration device (110) designed to selectively connect the primary circuits (2142) in series, and connect the primary circuit of the first voltage conversion module (1081) between the two global input terminals (P, N) so that its input voltage (VEi) is equal to the input voltage (VE), wherein the reconfiguration device (110) is adapted to deactivate the second voltage conversion module (1082) in order to connect the primary circuit of the first voltage conversion module (1081) between the two global input terminals (P, N).

2. An isolated voltage converter (106; 402; 502) according to claim 1, wherein the primary circuits (2142) of the voltage conversion modules (1081, 1082) each comprise at least one semiconductor switch (QA2, Qb2) and wherein the regulating device (118) is adapted to control the semiconductor switches (QA2, Qb2) so as to maintain the local input voltages (VE1, VE2) in the predefined ratio.

3. Isolated voltage converter (106; 402; 502) according to claim 2, wherein the regulating device (118) is designed to determine, from a difference (AVE) between the local input voltages (VE1, VE2), a compensation (Icomp) and to control one of the voltage conversion modules (108i, 1082) from an electrical setpoint (I*) reduced by the compensation (Icomp) and the other of the voltage conversion modules (108i, 1082) from the same setpoint (I*) increased by the compensation (Icomp)-

4. Isolated voltage converter (106; 402; 502) according to claim 3, wherein the regulating device (118) is designed to determine the electrical setpoint (I*) from a difference (AVS) between an output voltage (Vs) of the isolated voltage converter (106) and an output voltage setpoint (Vs*).

5. Isolated voltage converter (106; 402; 502) according to claim 3 or 4, wherein the electrical setpoint (I*) is a current setpoint and wherein the compensation (Icomp) is a current compensation.

6. Isolated voltage converter (106; 402; 502) according to any one of claims 2 to 5, wherein the primary circuit (2142) of each of the voltage conversion modules (1081, 1082) comprises two switches (QA2, Qb2) arranged as switching arms between two input terminals (Pb Nb P2, N2) of the voltage conversion module (108i, 1082) in question and wherein the regulating device (118) is designed to control the two switching arms according to the same switching period (TB) and according to a duty cycle so as to maintain said local input voltages (VEb VE2) in the predefined ratio, and by shifting the commands of one of the switching arms by 45% to 55%, preferably 50%, of the switching period (TB) relative to the commands of the other switching arm.

7. An isolated voltage converter (106; 402; 502) according to any one of claims 1 to 6, wherein the reconfiguration device (110) is configured to place the primary circuits (2142) of the voltage conversion modules (1081, 1082) in series when the overall input voltage (VE) is within a first predefined range of voltages and to connect the primary circuit of the first voltage conversion module (1081) between the two overall input terminals (P, N) when the overall input voltage (VE) is within a second predefined range of voltages, lower than the first predefined range of voltages.

8. An isolated voltage converter (106; 402; 502) according to any one of claims 1 to 7, wherein the first and second voltage conversion modules (1081, 1082) are DC-DC conversion modules.

9. An isolated voltage converter (106; 402; 502) according to any one of claims 1 to 8, wherein the secondary circuits (2162) of the first and second voltage conversion modules (1081, 1082) are connected in parallel with each other at the output of the isolated voltage converter.

10. Motor vehicle comprising a voltage converter (106; 402; 502) according to any one of claims 1 to 9.

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