EP4305730A1

EP4305730A1 - Voltage supply system, method for supplying a load via such a voltage supply system and vehicle comprising such a voltage supply system

Info

Publication number: EP4305730A1
Application number: EP22714369.0A
Authority: EP
Inventors: Emmanuel Talon
Original assignee: Valeo Systemes de Controle Moteur SAS
Current assignee: Valeo Systemes de Controle Moteur SAS
Priority date: 2021-03-08
Filing date: 2022-03-08
Publication date: 2024-01-17
Also published as: WO2022189467A1; FR3120485B1; US20240154409A1; FR3120485A1; CN117242668A

Abstract

The invention relates to a supply system comprising: • a first (Ba1), a second (Ba2) and a third (Ba3) supply terminals which are distinct from one another, a voltage regulating terminal (Br), an output terminal (Bs) electrically connected to said voltage regulating terminal (Br), • a first battery (Bat1) generating a first supply voltage (Va1) between said first supply terminal (Ba1) and said second supply terminal (Ba2), • a second battery (Bat2) generating a second supply voltage (Va2) between said second, input terminal (Ba2) and said third supply terminal (Ba3), said second battery (Bat2) being connected in series with said first battery (Bat1) so as to deliver a first output voltage (Vs1) between said third supply terminal (Ba3) and said first supply terminal (Ba1), • a DC-to-DC voltage converter (10) configured so that, in a first operating mode, it converts said first output voltage (Vs1) into a second output voltage (Vs2) between said regulating terminal (Br) and said first supply terminal (Ba1), said second output voltage (Vs2) being lower than said first output voltage (Vs1) and configured so that, in a second operating mode, it does not regulate the voltage between said regulating terminal (Br) and said first supply terminal (Ba1), • a connection switch (lnt_c) connecting said second supply terminal (Ba2) and said output terminal (Bs), and a connection resistor (R) connected in parallel with said connection switch (lnt_c), said supply system being designed to generate a third output voltage (Vs3) between said output terminal (Bs) and said first supply terminal (Ba1).

Description

TITLE: VOLTAGE SUPPLY SYSTEM, METHOD FOR SUPPLYING A LOAD BY SUCH A VOLTAGE SUPPLY SYSTEM AND VEHICLE COMPRISING SUCH A VOLTAGE SUPPLY SYSTEM

The present invention relates to a voltage supply system, a motor vehicle comprising such a voltage supply system and a method for supplying a load by a supply system included in a vehicle.

The present invention can be applied in particular in the field of hybrid motor vehicles.

[0003] It is known from the prior art for voltage supply systems comprising: a first, a second and a third supply terminal separate from each other, a voltage regulation terminal, an output terminal, an electrical connection, for example by wiring, between said voltage regulation terminal and said output terminal, the electrical connection having a connection resistance, a first battery generating a first supply voltage between the first supply terminal and the second power supply terminal, a second battery generating a second power supply voltage between the second input terminal and the third power supply terminal, the second battery being connected in series with the first battery so as to provide a first voltage of output between the third power supply terminal and the first power supply terminal, and a DC/DC voltage converter configured for in a first mode of operation c converting said first output voltage to a second output voltage between said regulating terminal and said first supply terminal, said second output voltage being lower than said first output voltage and configured to in a second mode of operation not regulating the voltage between said regulation terminal and said first supply terminal, the voltage supply system being able to generate a third output voltage between the output terminal and the first supply terminal .

[0004] However, in such a voltage supply system, the first battery is more highly stressed than the second battery, which requires oversizing this first battery, for example by doubling its number of cells, in order to guarantee it a life equivalent to that of the second battery.

The object of the invention is to at least partially overcome the aforementioned problem.

[0006] It is therefore proposed, according to a first aspect of the invention, a voltage supply system comprising: a first, a second and a third supply terminal separate from each other, a voltage regulation terminal , an output terminal, an electrical connection, for example by wiring, between said voltage regulation terminal and said output terminal, the electrical connection having a connection resistance, a first battery generating a first supply voltage between said first power terminal and said second power supply terminal, a second battery generating a second power supply voltage between said second input terminal and said third power supply terminal, said second battery being connected in series with said first battery so supplying a first output voltage between said third power supply terminal and said first power supply terminal, a voltage converter D C/DC configured to in a first mode of operation convert said first output voltage to a second output voltage between said regulation terminal and said first supply terminal, said second output voltage being lower than said first output voltage and configured for in a second mode of operation not regulating the voltage between said regulation terminal and said first supply terminal, a connection switch connecting said second supply terminal and said output terminal, a connection resistor connected in parallel with said connection switch , and said power supply system being capable of generating a third output voltage between said output terminal and said first power supply terminal.

This voltage supply system is characterized in that a connection switch in parallel with a connection resistor connects the second supply terminal and the output terminal.

[0008] Thanks to this technical feature, the third output voltage is generated either directly by the first battery when the connection switch is closed, or simultaneously by the first battery and by the DC/DC voltage converter when the switch is closed. connection is open. In the latter case, the connection resistor makes it possible to ensure an asymmetrical distribution of the current supplied by the first battery and by the DC/DC voltage converter and therefore an asymmetrical use of the DC/DC voltage converter and of the first battery. In other words, when the connection switch is open, the DC/DC voltage converter will supply more current than the first battery, which contributes to limiting the direct use of the first battery, thus making it possible to limit sizing in terms of cells while preserving its lifespan.

[0009] A voltage supply system according to the invention may also comprise one or more of the following optional characteristics, taken in isolation or else according to any technically possible combination.

[0010] According to a first feature, the power supply system further comprises a voltage converter control unit.

[0011] According to another feature, the power supply system further comprises means for controlling the connection switch.

[0012] According to another feature, the connection resistor is a resistor. In other words, the connection resistance is a dipole satisfying Ohm's law. [0013] According to yet another feature, the power supply system further comprises a first capacitor connecting the third power supply terminal to the first power supply terminal.

[0014] According to yet another feature, the power supply system further comprises a second capacitor connecting the output terminal to the first power supply terminal.

[0015] According to yet another feature, the power supply system further comprises a second capacitor connecting the voltage regulation terminal to the first power supply terminal.

According to yet another characteristic, the connection switch is normally closed.

A normally closed switch is a switch which allows a current to pass through it when the DC/DC voltage converter is inactive. In other words, the DC/DC voltage converter does not regulate the voltage between the regulation terminal and the first supply terminal, because this voltage converter is not working (i.e. it is inactive or faulty).

[0018] In other words, the connection switch is closed when the DC/DC voltage converter is not operating.

[0019] According to yet another characteristic, the connection switch comprises a transistor of the normally closed type, for example a P-channel FET transistor.

[0020] A normally closed type transistor is a transistor which allows a current to flow through it when the DC/DC voltage converter is inactive.

For example, the P-channel FET transistor is an enhancement transistor whose gate is grounded and the source is at a DC supply voltage, for example the first DC supply voltage.

According to yet another characteristic, the connection switch comprises a normally open type transistor, for example an N channel FET transistor, and a charge pump circuit able to apply a control voltage to said normally open type transistor.

According to yet another characteristic, the connection switch comprises a transistor of the normally open type, for example an N-channel FET transistor, and a charge pump circuit capable of applying a control voltage to said normally open type transistor to close said normally open type transistor when the voltage converter is not operating.

A normally open type transistor is a transistor which does not allow a current to flow through it when the DC/DC voltage converter is inactive.

According to yet another characteristic, the connection switch is configured to be closed when the voltage converter operates in the second operating mode.

According to yet another characteristic, the connection switch comprises a MOSFET transistor, for example made of silicon or silicon carbide, or a gallium nitride FET transistor or a gallium nitride FIEMT transistor.

According to yet another characteristic, the electrical connection between the output terminal and the voltage regulation terminal has a connection resistance of less than 1 mΩ, preferably less than or equal to 0.8 mΩ, even more preferably less than or equal to equal to 0.6 mQ.

According to yet another characteristic, the connection resistance is between 1 and 100 mΩ, preferably between 5 and 80 mΩ.

According to yet another characteristic, the connection resistance is 2 to 200 times higher, preferably 10 to 160 times higher, than the connection resistance of the electrical connection between the output terminal and the output terminal. regulation.

According to yet another feature, the DC/DC voltage converter further comprises one or more switching cells, said or each of said switching cells comprising:

• a switch arm having a high side switch and a low side switch connected to each other at a midpoint, said switch arm being connected between said first power supply terminal and said third power supply terminal , and

• an inductance connected between said midpoint of said switching arm and said regulation terminal.

According to yet another characteristic, the high side switch and/or said low side switch is a MOSFET transistor, for example made of silicon or silicon carbide, or a gallium nitride FET transistor or a gallium nitride HEMT transistor.

[0032] According to yet another feature, the power supply system is configured to, in a first mode of use of the power supply system, close the connection switch and put the voltage converter in the second mode of operation, and in a second mode of use of the power supply system, opening the connection switch and placing the voltage converter in the first mode of operation.

[0033] According to yet another characteristic, the power supply system is configured for, in a third mode of use of the power supply system, closing the connection switch and placing the voltage converter in the first mode of operation,

According to a second aspect of the invention, there is also proposed a vehicle comprising a power supply system according to the first aspect of the invention.

The vehicle according to the second aspect of the invention may further comprise the following optional feature that the vehicle further comprises a first load connected between the third voltage supply terminal and the first voltage supply terminal and a second load connected between the output terminal and the first voltage supply terminal or between the regulation terminal and the first voltage supply terminal.

According to a third aspect of the invention, there is also proposed a method for supplying a second load by means of a third output voltage by a supply system according to the first aspect of the invention or by a supply system included in a vehicle according to the second aspect of the invention, said supply method comprising the steps of:

• in a first mode of use of the power supply system, close the connection switch and put the voltage converter in the second mode of operation, and

• in a second mode of use of the power supply system, open the connection switch and put the voltage converter in the first mode of operation. The power supply method according to the third aspect of the invention may further comprise the following optional feature according to which the power supply method further comprises the steps consisting in in a third mode of use of the power supply system , close the connection switch and put the voltage converter in the first mode of operation.

The invention will be better understood using the following description, given solely by way of example and made with reference to the accompanying drawings in which:

[0039] [Fig. 1] Figure 1 schematically represents a voltage supply system 100 in a first embodiment of the invention, and

[0040] [Fig. 2] Figure 2 schematically represents a voltage supply system 300 in a second embodiment of the invention.

[0041] With reference to Figure 1, a voltage supply system 100 intended to equip, for example, a motor vehicle will now be described.

The voltage supply system 100 firstly comprises a DC/DC voltage converter 10, a first supply terminal Ba1, a second supply terminal Ba2 and a third supply terminal Ba3.

The three power supply terminals Ba1, Ba2 and Ba3 are separate from each other and the first power supply terminal Ba1 is electrically connected to an electrical ground GND.

The voltage supply system 100 also comprises a voltage regulation terminal Br and an output terminal Bs, the output terminal Bs being electrically connected, for example by wiring, to the voltage regulation terminal Br. As a variant, the voltage regulation terminal Br and the output terminal Bs can be electrically connected by a connection bar of low resistance or by any connection means having a low resistance, for example less than 1 mΩ.

Thus, there is a connection resistance Rc between the voltage regulation terminal Br and the output terminal Bs due to the electrical connection between the output terminal Bs and the regulation terminal Br.

In the example described here, this resistance is of the order of 0.5 mΩ. The voltage supply system 100 further comprises a first power supply source designed to deliver a first DC supply voltage Va1. This first electrical power source is connected between the first power supply terminal Ba1 and the second power supply terminal Ba2. In the example described, this first electrical power source is a battery Bat1 designed to supply, for example, a voltage of 12 V.

The voltage supply system 100 further comprises a safety switch SW and a second power supply source designed to deliver a second DC supply voltage Va2. This second electrical power source is connected to the second power supply terminal Ba2 and via the safety switch SW to the third power supply terminal Ba3. In the example described, this second electrical power source is a battery Bat2 designed to supply, for example, a voltage of 36 V.

In the example described here, the battery Bat1 comprises three cells or accumulators in series and the battery Bat2 comprises five cells or accumulators in series. For example, the cells of the batteries Bat1 and of the battery Bat2 are lithium-ion cells or even lithium-iron-phosphate cells called LFP cells or again lithium nickel-manganese-cobalt cells called NMC cells.

[0050] Furthermore, the first electrical power source and the second electrical power source are connected in series so that the first DC power supply voltage Va1 and the second DC power supply voltage Va2 are added to provide a first output voltage Vs1 between the third supply terminal Ba3 and the first supply terminal Ba1. In other words, in the example described here, the first battery Bat1 and the second battery Bat2 are connected in series, i.e. the plus pole of the first battery Bat1 is connected to the minus pole of the second battery Bat2 so as to supply a first output voltage Vs1 of 48V between the third power supply terminal Ba3 and the first power supply terminal Ba1

The voltage converter 10 further comprises one or more voltage conversion cells. The voltage conversion cell or cells are connected to the first power supply terminal Ba1, to the third power supply terminal Ba3 and to the voltage regulation terminal Br to perform a conversion between the first output voltage Vs1 and a second output voltage Vs2 between the voltage regulation terminal Br and the first supply terminal Ba1, the second output voltage Vs2 being lower than the first output voltage Vs1.

In the example described, the voltage converter 10 comprises a single voltage conversion cell and this conversion cell is a switching cell. It comprises for example a switching arm comprising a high side switch T1 and a low side switch T2 connected to each other at a midpoint Pm. The switching arm is connected between the third power supply terminal Ba3 and the first power supply terminal Ba1 to receive the first output voltage Vs1. This switching cell further comprises an inductance L connecting the midpoint Pm to the voltage regulation terminal Br.

The switch cell is designed to be controlled by DC commands to alternately open and close the high side and low side switch in opposition to each other so as to generate the second output voltage Vs2 from the first output voltage Vs1. The DC commands are issued by a control unit (not shown in Figure 1) of said voltage converter 10.

The output terminal Bs being electrically connected to the voltage regulation terminal Br, it follows that a third output voltage Vs3 is generated between the output regulation terminal Bs and the first supply terminal Ba1. This third output voltage Vs3 is substantially equal, to the ready voltage drop due to the connection resistance between the voltage regulation terminal Br and the output terminal Bs, to the second output voltage Vs3.

The voltage supply system 100 further comprises a capacitor C1 connecting the third power supply terminal Ba3 to the first power supply terminal Ba1 and a capacitor C2 connecting the regulation terminal Br to the first power supply terminal Ba1. Alternatively, capacitor C2 can be connected between output terminal Bs and first supply terminal Ba1.

The voltage supply system 100 also comprises a connection switch lnt_c and a connection resistor R connected in parallel between the second supply terminal Ba2 and the output terminal Bs. The connection switch lnt_c is controlled by control means (not shown in Figure 1). In the example described here, the connection resistance R is between 5 and 80 mO. In other words, the connection resistance R has a value from 10 to 160 times higher than the connection resistance Rc.

Each switch SW, T1, T2 and lnt_c comprises first and second main terminals and a control terminal intended to selectively open and close the switch SW, T1, T2 and lnt_c between its two main terminals according to a control signal applied to it.

If in the absence of a control signal on the control terminal, for example when the switch is made by a transistor, in the absence of control voltage on the gate of this transistor, the switch is closed , this will be referred to as a normally closed switch. Otherwise, the switch will be said to be normally open.

The switches SW, T1, T2 and lnt_c are for example produced by transistor switches such as metal-oxide gate field-effect transistors, generally designated by the acronym MOSFET (from the English “Metal Oxide Semiconductor Field Effect Transistor”).

In the example described here, the switches SW, T1 and T2 are N-channel MOSFETs and the switch lnt_c is made in the form of two transistors T3 and T3' mounted head to tail (by an electrical connection between their respective source or alternatively by an electrical connection between their respective drain), the two transistors T3 and T3' being P-channel MOSFETs controlled simultaneously on opening or closing.

Alternatively; the lnt_c switch can be made in the form of a single P-channel MOSFET transistor T3.

In other words, the switches SW, T1, T2 are normally open switches and the switch lnt_c is a normally closed switch.

The motor vehicle comprising the voltage supply system 100 also comprises a first load Ch1 connected between the third voltage supply terminal Ba3 and the first voltage supply terminal Ba1 and a second load Ch2, for example a radio or a lamp, connected between the output terminal Bs and the first voltage supply terminal Ba1. In other words, the motor vehicle has two on-board networks, the first being powered by the first output voltage Vs1 and the second being powered by the second output voltage Vs2. In the example described here, the first on-board network is powered by a voltage of 48V and the second on-board network is powered by a voltage of 12V.

A method of supplying the second load Ch2 by the supply system 100 included in the motor vehicle will now be described.

In the example described here, the motor vehicle comprises a starter powered by the second on-board network.

In a first mode of use MOD1 of the power supply system 100, used for example when the vehicle is stationary, i.e. the electric and/or heat engine propelling the motor vehicle is stationary, the means of the connection switch lnt_c keep it in a closed state, i.e. the transistors T3 and T3' are in an on state, the switch SW is open and the control unit of the voltage converter 10 operates this last in the second mode of operation, i.e. the voltage converter 10 does not regulate the voltage between the regulation terminal Br and the first supply terminal Ba1.

In this first mode of use, the first on-board network is powered solely by the battery Bat1. In other words, the third output voltage Vs3 supplying the second load Ch2 is supplied only by the first battery Bat1.

In a second mode of use MOD2 of the power supply system 100, used for example when the engine of the vehicle is running, the control means of the connection switch lnt_c keep it in an open state, i.e. the transistors T3 and T3' are in an off state, the switch SW is closed and the control unit of the voltage converter 10 operates the latter in the first mode of operation, i.e. the voltage converter 10 converts the first voltage output voltage Vs1 into a second output voltage Vs2 between the regulation terminal Br and the first supply terminal Ba1.

In this second mode of use MOD2, the battery Bat1 is connected to the output terminal Bs via the connection resistor R. In this second mode of operation MOD2, the ratio between the connection resistance Rc and the connection resistance R causes an asymmetrical distribution of the current supplied by the battery Bat1 and by the voltage converter 10 and therefore an asymmetrical contribution from the voltage converter 10 and the battery Bat1. In in other words, in the example described, the voltage converter 10 will contribute from 10 to 160 times more than the battery Bat1 to the regulation of the voltage of the second output voltage Vs2 which contributes to limiting the direct use of the battery Bat1, thus making it possible to limit its dimensioning in terms of cells while preserving its lifetime.

In a third mode of use MOD3 of the power supply system 100, used for example when the engine is started by means of the starter powered by the second on-board network, the control means of the connection switch lnt_c maintain the latter in a closed state, i.e. the transistors T3 and T3' are in an on state, the switch SW is closed and the control unit of the voltage converter 10 begins to operate the latter in the first mode of operation, i.e. the voltage converter 10 converts the first output voltage Vs1 into a second output voltage Vs2 between the regulation terminal Br and the first supply terminal Ba1.

In this third mode of use MOD3, the battery Bat1 is directly connected to the output terminal Bs so that the battery Bat1 is able to contribute to supplying, in the same way as the voltage converter 10, the power necessary for the vehicle engine start.

[0073] Referring to Figure 2, a second embodiment of the invention will now be presented. Elements which are identical or similar to those of the first embodiment bear the same numerical reference in the description of this second embodiment.

The voltage supply system 300 in this second embodiment differs from the voltage supply system 100 of the first embodiment in that the connection switch lnt_c′ is made in the form of two transistors T3” and T3'” mounted head to tail (by an electrical connection between their respective source or alternatively by an electrical connection between their respective drain) and a charge pump circuit.

The two transistors T3" and T3'" are N-channel MOSFETs controlled simultaneously on opening or closing by their control means, said control means comprising the charge pump circuit, the latter being capable of applying a control voltage on the gate of the transistors T3”,

T3'” normally open type. In other words, the combination of the normally open transistors T3”, T3′” and the charge pump circuit produces a normally closed switch lnt_c′.

Alternatively; the switch lnt_c’ can be made using a single N-channel MOSFET transistor T3”.

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 the light of the teaching which has just been disclosed to them.

For example, in the embodiment of Figure 1 or Figure 2, the DC / DC converter 10 comprises a single cell. Of course, the number of C cells could be different without departing from the scope of the present invention. Thus, it is possible to use several cells of similar or identical structures arranged in parallel. The number of cells N can for example be between 2 and 12, being for example 2, 3, 4, 5 or 6.

The use of several cells can make it possible to reduce the constraints on the switches. We then speak of an interlaced converter because the cells of the voltage converter all lead to the same output capacitor C2 with a phase shift of T/N between the commands of the switches of each successive cell where T is the period of the converter's operating cycle . In other words, the duty cycle within each of the cells is identical but the commands of the transistors are out of phase by T/N from one cell to another.

Furthermore, in the examples described above, the switches SW, T1, T2, T3, T3′, T3″, T3′″ are MOSFETs, for example made of silicon (Si-MOSFET) or carbide. silicon (SiC-MOSFET).

As a variant, these transistors can be transistors of the IGBT type (standing for “Insulated-Gate Bipolar Transistor”) or of the FET type (standing for “Field-effect transistor”) made of gallium nitride (GaN -FET), or even of the FIEMT (high-electron-mobility transistor) type, for example made of gallium nitride.

Of course, other DC/DC voltage converter topologies can be used in a first mode of operation to convert the first output voltage into a second output voltage between the regulation terminal and the first power supply terminal. , the second output voltage being lower than the first output voltage and in a second operating mode not to regulate the voltage between the regulation terminal and the first supply terminal.

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 therein all the equivalents including the forecast 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

[1] Voltage supply system (100, 300) comprising: a first (Ba1), a second (Ba2) and a third (Ba3) supply terminal separate from each other, a voltage regulation terminal ( Br), an output terminal (Bs), an electrical connection, for example by wiring, between said voltage regulation terminal (Br) and said output terminal (Bs), said electrical connection having a connection resistance (Rc) , a first battery (Bat1) generating a first supply voltage (Va1) between said first supply terminal (Ba1) and said second supply terminal (Ba2), a second battery (Bat2) generating a second supply voltage supply (Va2) between said second input terminal (Ba2) and said third supply terminal (Ba3), said second battery (Bat2) being connected in series with said first battery (Bat1) so as to supply a first voltage of output (Vs1) between said third supply terminal (Ba3) and t said first power supply terminal (Ba1), a DC/DC voltage converter (10) configured to in a first mode of operation convert said first output voltage (Vs1) into a second output voltage (Vs2) between said terminal regulator (Br) and said first supply terminal (Ba1), said second output voltage (Vs2) being lower than said first output voltage (Vs1) and configured so as in a second mode of operation not to regulate the voltage between said regulation terminal (Br) and said first supply terminal (Ba1), a connection switch (lnt_c, lnt_c') connecting said second supply terminal

(Ba2) and said output terminal (Bs), and a connection resistor (R) connected in parallel with said connection switch (lnt_c, lnt_c'), said power supply system being able to generate a third output voltage

(Vs3) between said output terminal (Bs) and said first supply terminal (Ba1).

[2] Power supply system (100, 300) according to the preceding claim wherein the connection switch (int_c, int_c') is normally closed. [3] Power supply system (100) according to the preceding claim, in which the connection switch (lnt_c) comprises a normally closed type transistor (T3, T3'), for example a P-channel FET transistor.

[4] Power supply system (100) according to claim 1 or 2 wherein the connection switch (lnt_c) comprises a normally open type transistor (T3, T3 '), for example an N channel FET transistor and a circuit charge pump able to apply a control voltage to said normally open type transistor (T3, T3').

[5] Power supply system (100, 300) according to one of the preceding claims, in which the connection switch (lnt_c, lnt_c') is configured to be closed when the voltage converter (10) operates in the second mode Operating.

[6] Power supply system (100, 300) according to one of the preceding claims wherein said connection resistance (R) is 2 to 200 times higher, preferably 10 to 160 times higher, than said resistance connection (Rc) of the electrical connection between said output terminal (Bs) and said regulation terminal (Br).

[7] Power supply system (100, 300) according to one of the preceding claims, in which the DC/DC voltage converter further comprises one or more switching cells (CC), said or each of said switching cells comprising: a switching arm comprising a high side switch (T1) and a low side switch (T2) connected to each other at a midpoint (Pm), said switching arm being connected between said first terminal of supply (Ba1) and said third supply terminal (Ba3), and an inductance (L) connected between said midpoint (Pm) of said switching arm and said regulation terminal (Br).

[8] Power supply system (100, 300) according to the preceding claim wherein said high side switch and/or said low side switch (204) is a MOSFET transistor, for example made of silicon or silicon carbide, or a gallium nitride FET transistor or a gallium nitride HEMT transistor.

[9] Vehicle comprising a supply system (100, 300) according to one of the preceding claims.

[10] Vehicle according to the preceding claim comprising a first load (Ch1) connected between the third voltage supply terminal (Ba3) and the first voltage supply terminal (Ba1) and a second load (Ch2) connected between the output terminal (Bs) and the first voltage supply terminal (Ba1) or between the regulation terminal (Br) and the first voltage supply terminal (Ba1).

[11] Method of supplying a second load (Ch2) by means of a third output voltage (Vs3) by a supply system (100, 300) according to one of claims 1 to 8, said method power supply comprising the steps consisting in: in a first mode of use (MOD1) of the power supply system (100), closing the connection switch (lnt_c, lnt_c') and putting the voltage converter (10) in the second mode of operation, and in a second mode of use (MOD2) of the power supply system (100), opening the connection switch (lnt_c, lnt_c') and putting the voltage converter (10) in the first operating mode.

[12] Method according to the preceding claim wherein said power supply method further comprises the steps of in a third mode of use (MOD3) of the power supply system (100), closing the connection switch (lnt_c, lnt_c') and put the voltage converter (10) in the first operating mode.