DC-DC conversion device and electrical system having such conversion device

Abstract

The invention discloses an apparatus comprising: a first DC-DC converter and a second DC-DC converter (112a, 112b) each comprising an inverter (202a, 202b), a resonant circuit (204a, 204b) comprising a transformer (Ta, Tb), and a capacitor (Ca, Cb) and an inductor (La, Lb) in series with a primary coil (Pa, Pb) of the transformer (Ta, Tb), a secondary coil (S) of the transformer (T) having at least two terminals; an output capacitor (COUT); and a loop (B) for each of the transformers (Ta, Tb) that extends from one terminal (S1a, S2a, Ma, S1b, S2b, Mb) of the secondary coils (Sa, Sb) of the transformers (Ta, Tb) to the other and passes through the output capacitor (COUT). The output capacitor (COUT) is positioned such that each of the two loops (B) has a maximum inductance of 20 nH.

Description

Technical Field

[0001] The present invention relates to a DC-DC converter, an electrical system having the DC-DC converter, and a motor vehicle.

[0002] The motor vehicle is, for example, a motor-driven land vehicle, a train, an aircraft or a drone. The motor-driven land vehicle is, for example, a motor vehicle, a motorcycle, a motorized bicycle or a motorized wheelchair. Background Art

[0003] The prior art discloses a DC-DC conversion device, which includes:

[0004] The first DC-DC converter and the second DC-DC converter each include:

[0005] an inverter, the inverter being designed to convert the input voltage into a first AC intermediate voltage,

[0006] a resonant circuit including a transformer, and a capacitor and an inductor connected in series with a primary coil of the transformer and a first intermediate voltage, and

[0007] a rectifier designed to convert a second alternating intermediate voltage present at a secondary coil of a transformer having at least two terminals into an output voltage;

[0008] an output capacitor designed to have the output voltage; and

[0009] For each of these transformers, the loop extends from one terminal to the other in the secondary winding of the transformer and through the output capacitor.

[0010] In order for the DC-DC conversion device to function correctly, it is necessary to prevent the output of the DC-DC converter from generating resonances that would interfere with the resonance of the resonant circuit. It is known to use a high capacity output capacitor for this purpose. However, this is expensive and bulky.

[0011] It may therefore be desirable to provide a DC-DC conversion device that makes it possible to overcome at least some of the above-mentioned problems and constraints. Summary of the invention

[0012] Therefore, a DC-DC conversion device is proposed, which includes:

[0013] The first DC-DC converter and the second DC-DC converter each include:

[0014] an inverter, the inverter being designed to convert the input voltage into a first AC intermediate voltage,

[0015] a resonant circuit including a transformer, and a capacitor and an inductor connected in series with a primary coil of the transformer and a first intermediate voltage, and

[0016] a rectifier designed to convert a second alternating intermediate voltage present at a secondary coil of a transformer having at least two terminals into an output voltage;

[0017] an output capacitor designed to have the output voltage; and

[0018] a loop for each of the transformers extending from one terminal to the other of the secondary winding of the transformer and through the output capacitor;

[0019] It is characterized in that the output capacitor is positioned so that each of the two loops has a maximum inductance of 20nH.

[0020] Therefore, due to the constraint on the inductance of the conduction path represented by the loop, a low value output capacitor can be used without disturbing the resonant circuit. In particular, the length of the conduction path between the output capacitor and the two terminals of the transformer can be shortened in order to reduce the inductance of the two loops below a threshold.

[0021] The present invention may further have one or more of the following optional features in any technically possible combination.

[0022] Optionally, the output capacitor is designed to have the output voltage of the first DC-DC converter and the second DC-DC converter between two terminals.

[0023] Also optionally, the secondary coil of each of the transformers includes a first end terminal, a second end terminal and an intermediate terminal, and the loop passes through:

[0024] a first switching element and a conductor for connecting the first switching element between the first terminal and the first end terminal of the capacitor; and / or

[0025] A second switching element and a conductor for connecting the second switching element between the first terminal and the second end terminal of the capacitor.

[0026] Also optionally, for each transformer, the loop passes through a conductor for connecting a second terminal of the output capacitor different from the first terminal and an intermediate terminal of the transformer.

[0027] Also optionally, the second terminal of the output capacitor is connected to the intermediate terminal of each transformer.

[0028] Also optionally, the output capacitor comprises several capacitive elements.

[0029] Also optionally, the capacitive elements are connected in parallel.

[0030] Also optionally, the capacitive elements are distributed in at least two arrangements (eg parallel arrangements).

[0031] Also optionally, at least one of the terminals of the secondary coil of a first one of the transformers is separated from at least one of the terminals of the secondary coil of another one of the transformers by a maximum of 3 cm.

[0032] Also optionally, there is a quadrilateral whose four vertices are respectively located on the pins of the first end terminal of the secondary coil of the first transformer, the pins of the second end terminal of the secondary coil of the first transformer, the pins of the first end terminal of the secondary coil of the second transformer, and the pins of the second end terminal of the secondary coil of the second transformer, and at least one capacitive element of the output capacitor extends within this quadrilateral.

[0033] Also optionally, the transformers are carried by the same electronic board, being located on the same side of the board.

[0034] An electrical system is also proposed, the electrical system having:

[0035] a first DC voltage source and a second DC voltage source; and

[0036] According to the DC-DC conversion device of the present invention, the inverter of the first DC-DC converter is connected to the first DC voltage source to receive its input voltage, and the inverter of the second DC-DC converter is connected to the second DC voltage source to receive its input voltage.

[0037] A motor vehicle is also proposed, which comprises a DC-DC converter device according to the invention or an electrical system according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The invention will be better understood from the following description which is given by way of example only and made with reference to the accompanying drawings, in which:

[0039] Figure 1 is a very simplified view of a motor vehicle in which the invention may be implemented,

[0040] Figure 2 is a circuit of a DC-DC converter having an inverter, a resonant circuit and a rectifier according to a first embodiment,

[0041] Figure 3 Shows Figure 2Examples of DC-DC converter switching circuits and rectifiers,

[0042] Figure 4 shows that when the controlled variable is phase shift Figure 2 and Figure 3 The timing diagram of the electrical quantities of the DC-DC converter,

[0043] Figure 5 It is shown that when the control variable is a phase shift without switching to the second mode according to the present invention Figure 2 and Figure 3 The timing diagram of the electrical quantities of the DC-DC converter,

[0044] Figure 6 is used for Figure 2 and Figure 3 Another example circuit of a DC-DC converter rectifier,

[0045] Figure 7 is a functional view of a computing system that can be used in a DC-DC converter,

[0046] Figure 8 is a circuit of a DC-DC conversion device according to a second embodiment,

[0047] Fig. 9 is a circuit of a transformer and a rectifier of a DC-DC conversion device of a second embodiment,

[0048] Fig.10 yes Fig. 9 A top view of the DC-DC converter when mounted on an electronic board.

[0049] Fig.11 yes Fig.10 , particularly showing the arrangement of the two transformers of the DC-DC converter,

[0050] Fig.12 is a simplified view of another arrangement example of a transformer, and

[0051] Fig.13 is a simplified view of yet another example arrangement of a transformer. DETAILED DESCRIPTION

[0052] Now refer to Figure 1 A motor vehicle 100 is described in which the present invention may be used.

[0053] The motor vehicle 100 includes a propulsion system 102, such as a drive wheel 104 and an electric motor 106 designed to drive the drive wheel 104. The motor vehicle 100 further includes a battery 108, which is designed to supply power to the electric motor 106, for example. The battery 108 is designed to supply a DC voltage (referred to as a battery voltage V BAT ). The battery voltage is a high voltage, ie, greater than 100V, preferably greater than 150V.

[0054] The motor vehicle 100 further comprises a low-voltage network 110 which is designed to be powered by a DC voltage (referred to as network voltage V BT ) power supply. The low voltage is a voltage less than or equal to 100V, and preferably less than or equal to 60V.

[0055] In order to get the battery voltage V BAT Get the network voltage V BT The motor vehicle includes a DC-DC converter 112, which is designed to convert the battery voltage V BAT Converted into network voltage V BT . Battery voltage V BAT and network voltage V BT The input voltage and the output voltage of the DC-DC converter 112 are thus formed, respectively.

[0056] Now refer to Figure 2 An example of the DC-DC converter 112 is described.

[0057] The DC-DC converter 112 is an LLC converter and therefore first includes an inverter 202 , a resonant circuit 204 and a rectifier 206 .

[0058] The inverter 202 is designed to convert the input voltage V IN (When Figure 1 When used in the background, the battery voltage V BAT ) is converted into a first AC intermediate voltage V1~.

[0059] More specifically, the inverter 202 includes a switch circuit 208 and a control device 210, which is designed to control the switch circuit 208 so as to increase the output voltage V OUT (When Figure 1 When used in the background, the voltage V BT ) is maintained at the desired set value V received by the control device 210 OUT *.

[0060] The resonant circuit 204 includes a transformer T, and a capacitor C and an inductor L connected in series with a primary coil P of the transformer T and a first intermediate voltage V1. The transformer T has a magnetizing inductor Lm. Therefore, the capacitor C and the inductors L, Lm define a resonant frequency F of the resonant circuit 204, for example, between 80 and 120 kHz, for example, 100 kHz. R .

[0061] The rectifier 206 is connected to the secondary winding S of the transformer T, which is designed to have a second AC intermediate voltage V2~. Therefore, the rectifier 206 is designed to convert this second intermediate voltage V2~ present at the secondary winding S of the transformer T into an output voltage V OUT In some embodiments, rectifier 206 may include one or more controlled switches (eg, transistor switches) controlled, for example, by control circuit 210 .

[0062] The DC-DC converter 112 also includes, for example, a voltage sensor 212 designed to measure the output voltage V OUT The measurement result is supplied to the control device 210 so that the control device can output the voltage V OUT Adjust to the set value V OUT *.

[0063] Now refer to Figure 3 Examples of the switching circuit 208 and the rectifier 206 are described.

[0064] In this example, the switch circuit 208 includes a complete bridge of controlled switches G1A, G1B, G2A, G2B (e.g., controlled transistors). Therefore, the switch circuit 208 includes two switch arms. Each switch arm includes two switches G1A, G1B and G2A, G2B, which are connected to each other at a midpoint and have a common input voltage V IN Therefore, the first intermediate voltage V1~ exists between the two midpoints of the two switching arms.

[0065] Continuing with this example, the rectifier 206 includes a capacitor C OUT , the first terminal of the capacitor is connected to the middle terminal M of the secondary winding S of the transformer T. The rectifier 206 further includes two switches Q1, Q2, such as controlled transistors or actually diodes, which are respectively connected between one of the two end terminals S1, S2 of the secondary winding S of the transformer T and the capacitor C OUT Furthermore, each of the two switches Q1 and Q2 is connected to a different end terminal S1, S2.

[0066] The control device 210 is designed to selectively control the switch circuit 208 in a first mode and a second mode.

[0067] In the first mode, the switch circuit 208 is operated at a frequency substantially equal to the resonant frequency F R The fixed switching frequency F D Control, for example, equal to the resonant frequency F R (within 5%, preferably within 1%), and preferably less than the resonant frequency F R .

[0068] For example, the switch circuit 208 is controlled by modifying the control variable. For example, if the inverter 202 includes two switch arms (such as Figure 3 As shown), the first mode is the phase shift modulation mode, in which the control variable may be the phase shift PHI between the two switching arms, wherein the duty cycle of each switching arm is fixed at, for example, 50%.

[0069] By using a frequency close to the resonant frequency F R The switching frequency F D , very high efficiency can be achieved. For example, a power efficiency greater than 90% can be achieved. However, this method has limited performance below a certain input voltage V IN It is impossible at this level.

[0070] For example, if phase shift PHI is used, the input voltage V IN The lower the value, the more the phase shift PHI needs to be increased. However, the phase shift PHI can only be increased to 180° at most.

[0071] In the second mode, by setting the switching frequency F D Modified to be lower than the resonant frequency F R To control the switch circuit 208. Using a frequency lower than the resonant frequency F R The switching frequency F D This allows the input voltage V to be increased IN With output voltage V OUT and thus achieve the desired setting value V OUT *, even if the input voltage V IN The level is too low to continue at the resonant frequency F R The same is true for the following operation.

[0072] For example, in this second mode, the control variable (eg the phase shift PHI) remains fixed.

[0073] In order to switch from the first mode to the second mode, the control means 210 are designed, for example, to detect when the control variable reaches a threshold value, for example when the phase shift PHI (when used) reaches 180°. In order to switch from the second mode to the first mode, the control means 210 are designed, for example, to detect when the switching frequency F DWhen the resonant frequency F is basically reached R , for example the difference is within 5% and preferably within 1%.

[0074] Alternatively, the control device 210 may be designed to reduce the input voltage V IN A comparison with a threshold is made to switch from one mode to the other: when the input voltage is greater than the threshold, the control device 210 will be in the first mode, and when the input voltage is less than the threshold, the control device will be in the second mode.

[0075] Therefore, reference Figure 4 , an example of the operation of the control device 210 will now be described, more specifically in the case where the controlled variable is the phase shift PHI.

[0076] Initially, in stage 402, the control device 210 controls the switching circuit 208 in the first mode, that is, the switching frequency F D Basically equal to the resonant frequency F R The output voltage V is obtained by modifying the phase shift PHI OUT In particular, when the input voltage V IN When it decreases, the phase shift PHI increases.

[0077] At time 404, the phase shift reaches a predetermined threshold S, for example 180°.

[0078] The control device 210 detects that the phase shift PHI has reached this threshold value S and then controls the switching circuit 208 in a second mode in a phase 406, i.e. by lowering the switching frequency F D Modified to be lower than the resonant frequency F R In particular, the input voltage V IN The more it decreases, the switching frequency F D On the contrary, when the input voltage V IN When the switching frequency F D Increase.

[0079] At time 408, the switching frequency F D Basically reaching the resonant frequency F R .

[0080] The control device 210 detects that the resonant frequency F has been reached. R , and then again in phase 410 the switch circuit 208 is controlled in the first mode.

[0081] exist Figure 4 In the example of FIG. 1 , the switch from one mode to another mode is performed at about 210 V. Therefore, alternatively, the control device 210 can be configured to control the input voltage V INWhether it is greater or less than this 210V threshold, switching from one mode to another is performed as described above.

[0082] refer to Figure 5 , without switching to the second mode, when the input voltage V IN When it becomes too low (below approximately 210 V in the example shown) and regulation is no longer possible because the phase shift PHI is at its maximum value of 180°, the output voltage V OUT No longer able to maintain the set value V OUT * and therefore as the input voltage V IN and decreases until, in the example shown, when the input voltage V IN The output voltage reaches an asymptote when stable.

[0083] Now refer to Figure 6 Another example of the rectifier 206 is described.

[0084] In this example, the rectifier 206 comprises a complete bridge of switching elements (eg controlled transistors). Alternatively, these switching elements may be diodes.

[0085] Figure 6 The rectifier 206 is as described above for Figure 3 The rectifier 206 operates in the manner described.

[0086] refer to Figure 7 , the control device 210 may be a computing system comprising a data processing unit 702, such as a microprocessor, and a main memory 704, such as a RAM (Random Access Memory), which can be accessed by the processing unit 702. The computing system further comprises, for example, a network interface and / or a computer-readable medium, such as a local medium, such as a local hard disk 706, or a remote medium, such as a remote hard disk accessible via a communication network via a network interface, or a removable medium, such as a USB (Universal Serial Bus) stick, a CD (Compact Disc) or a DVD (Digital Versatile Disc) that can be read by an appropriate drive of the computing system, such as a USB port or a CD and / or DVD drive. A computer program 708 containing instructions for the processing unit 702 is stored on the medium 706 and / or can be downloaded via the network interface. For example, this computer program 708 is intended to be loaded into the main memory 704 so that the processing unit 702 can execute its instructions.

[0087] Alternatively, all or part of the computer program 708 may be implemented in the form of a hardware module not involving a computer program, ie in the form of an electronic circuit (eg a micro-cable circuit).

[0088] Now refer to Figure 8A DC-DC converter device 800 is described. The device 800 may, for example, replace Figure 1 The converter 112 in the motor vehicle 100 is shown.

[0089] The device 800 replicates the voltage converter 112, duplicating it for redundancy. Therefore, the device 800 includes two voltage converters 112a, 112b. Therefore, the reference numerals used in the previous figures will be used, wherein the letter "a" is added to the elements of the voltage converter 112a, and the letter "b" is added to the elements of the voltage converter 112b.

[0090] Only the output capacitor C OUT It is not replicated but shared by the two converters 112a, 112b.

[0091] Therefore, the device 800 is designed to receive two input voltages V IN a. V IN b in order to provide an output voltage V OUT When Figure 1 When used in the background, the input voltage V IN a. V IN The values ​​of b are each, for example, the battery voltage V BAT Alternatively, the input voltage can be equal to the battery voltage V BAT .

[0092] refer to Fig. 9 , the device 800 includes at least one loop B passing through the output capacitor C OUT And extends from one terminal to the other terminal of the secondary coil Sa of the transformer Ta.

[0093] exist Fig. 9 In FIG. 4 , loop B extends from the second end terminal S2 b to the middle terminal Mb and also passes through the switch Q2 a.

[0094] More precisely, each terminal S1a, S2a, Ma comprises at least one pin, and in the example shown comprises four pins indicated by dashed lines. In addition, the output capacitor C OUT The switches Q2a, Q2b include one or more capacitive elements, and each switch Q2a, Q2b includes one or more switch elements. These capacitive elements are, for example, connected in parallel with each other. In addition, the capacitive elements can be distributed in at least two arrangements, such as in the example shown, where these capacitive elements are distributed in two arrangements, such as parallel arrangements. Preferably, each arrangement includes at least three capacitive elements. Also preferably, all arrangements include the same number of capacitive elements.

[0095] Therefore, the loop B extends from one of the pins of the intermediate terminal Ma to one of the pins of the second end terminal S2a, passes through one of the switching elements of the switch Q2a and passes through at least one of the capacitive elements.

[0096] The output capacitor C can also be calculated based on the connected pin, the switch Q2a or Q2b through which the loop passes, the switching element of the switch Q2a or Q2b through which the loop passes, and the output capacitor C through which the loop passes. OUT Capacitive elements are used to define other loops, such as loop B. For example, a loop extending from the middle terminal Ma to the first end terminal S1a and passing through the switching element Q1a and the output capacitor C OUT another loop of one of the capacitive elements.

[0097] A loop can be defined in a similar manner for the transformer Tb.

[0098] To minimize stray output inductance, the output capacitor C OUT Positioned sufficiently close to the secondary windings Sa, Sb of the two transformers Ta, Tb so that for each transformer Ta, Tb at least one possible loop (and preferably each possible loop) has a maximum inductance of 20 nanohenry (nH).

[0099] refer to Fig.10 The device 800 includes an electronic board 1102, transformers Ta, Tb, and an output capacitor C OUT The capacitive elements and the switching elements of switches Q1a, Q2a, Q1b, Q2b are mounted on the same surface of the electronic board.

[0100] The electronic board 1102 includes a circuit designed to receive the battery voltage V BAT and divides it into the input voltage V IN a. V IN b high voltage input 1104, and is designed to supply output voltage V OUT A low voltage output 1106 is provided.

[0101] For each converter 112a, 112b, the electronic board 1102 carries a primary circuit CPa, CPb, a secondary circuit CSa, CSb and a control circuit CCa, CCb.

[0102] The primary circuit CPa, CPb is connected between the high voltage input 1104 and the primary coils Pa, Pb of the transformers Ta, Tb. This primary circuit CPa, CPb comprises in particular a switching circuit 202a, 202b and a resonant circuit 204a, 204b and is designed to operate at a high voltage.

[0103] The secondary circuit CSa, CSb is connected between the secondary windings Sa, Sb of the transformers Ta, Tb and the low voltage output 1106. This secondary circuit CSa, CSb comprises in particular rectifiers 206a, 206b and is designed to operate at low voltage. The secondary circuit CSa, CSb therefore comprises at least one switching element, namely that or those switching elements of switches Q1a, Q2a, Q1b, Q2b.

[0104] The control circuit CCa is designed to control the switching elements of the switches Q1a, Q2a. For this purpose, the control circuit comprises, for example, a microcontroller uCa. Similarly, the control circuit CCb is designed to control the switching elements of the switches Q1b, Q2b. For this purpose, the control circuit comprises, for example, a microcontroller uCb.

[0105] The secondary circuit CSa, CSb thus forms part of a low-voltage circuit CBT carried by the electronic board 1102 .

[0106] refer to Fig.11 , the secondary coils Sa and Sb of the transformers Ta and Tb are positioned relative to each other so that only the low voltage circuit CBT extends into the area of ​​the electronic board 1102 that separates the secondary coils Sa and Sb. In order to define this area more accurately, it can be analogized to a quadrilateral Q extending in particular in the plane of the electronic board 1102, wherein the four vertices are located on the pins of the first end terminal S1a, the pins of the second end terminal S2a, the pins of the first end terminal S1b, and the pins of the second end terminal S2b. Therefore, only the low voltage circuit CBT extends in the quadrilateral Q. In particular, the primary circuits CPa and CPb of the transformers Ta and Tb and the primary coils Pa and Pb extend outside the quadrilateral Q. For example, as shown in the example, this quadrilateral Q is a rectangle. "Extending in the quadrilateral" means that the orthogonal projections of the elements (components and conductors) of the low voltage circuit CBT in the plane of the electronic board 1102 extend in the quadrilateral Q. Similarly, “extending outside the quadrilateral” means that the orthogonal projection of the elements (components and conductors) of the primary circuits CPa, CPb operating at high voltage in the plane of the electronic board 1102 is outside the quadrilateral Q.

[0107] To obtain low inductance in each loop, capacitor C OUTAt least one capacitive element, and preferably all capacitive elements, of the transformers Ta, Tb are located, for example, in a quadrilateral Q. The capacitive elements are therefore as close as possible to both secondary coils at the same time, and in particular to their pins. Furthermore, at least one of the terminals S1a, S2a, Ma, S1b, S2b, Mb of the secondary coils Sa, Sb of a first transformer Ta, Tb is separated from at least one of the terminals S1a, S2a, Ma, S1b, S2b, Mb of the secondary coils Sa, Sb of another transformer Ta, Tb by a maximum of 3 cm. This makes it possible to ensure that the secondary coils Sa, Sb are sufficiently close to each other to allow the output capacitor C OUT Approach them both at the same time.

[0108] Furthermore, both control circuits CCa, CCb extend on one side outside of the first line L1 and the second line L2 forming the sides of a quadrilateral Q extending from one transformer Ta, Tb to the other transformer (in the example shown, the control circuits CCa, CCb extend below the line L2). However, each control circuit CCa, CCb may need to be connected to a component located outside the quadrilateral Q, located on a different side of the line L1, L2 than the control circuit CCa, CCb (in the example shown, located above the line L1).

[0109] For example, each control circuit CCa, CCb may need a switching element connected to the switch Q1a, Q1b or a pilot (not shown) connected to these switching elements in order to control these switching elements.

[0110] Alternatively, each control circuit CCa, CCb may need to be connected to a current sensor 1108 (e.g., for measuring the current flowing through the low voltage output 1106) or a temperature sensor 1110 (e.g., for measuring the temperature of the low voltage output 1106) in order to receive measurement results from the sensors 1108, 1110.

[0111] In order to avoid the need to make connections under the transformers Ta, Tb or indeed through secondary circuits operating at high voltage, a connection 1202a, 1202b is provided between the control circuit CCa, CCb and each component to which it is to be connected, this connection 1202a, 1202b passing through the quadrilateral Q via two lines L1, L2. "Passing through the quadrilateral" means that the orthogonal projection of the connection 1202a, 1202b in the plane of the electronic board 1102 passes through the quadrilateral Q. In practice, the connections 1202a, 1202b may be formed at least partially by internal layers in the electronic board so as to provide a connection between tracks and / or components of the low voltage circuit CBT extending within the quadrilateral Q (such as the output capacitor C OUT capacitive element).

[0112] For example, connections 1202a, 1202b connect microcontrollers uCa, uCb to desired components.

[0113] Thus, the connections 1202a, 1202b pass through the low voltage circuit CBT instead of the primary circuits CPa, CPb which require insulation or larger distances due to operating at high voltages.

[0114] Fig.12 and Fig.13 Two other possible arrangements of transformers Ta, Tb and quadrilateral Q that can be defined in these circumstances are shown.

[0115] In summary, it should be noted that the present invention is not limited to the embodiments described above. In fact, it will be apparent to those skilled in the art that various modifications may be made to the embodiments described above based on the teachings just disclosed to them.

[0116] In the detailed presentation of the invention given above, the terms used should not be interpreted as limiting the invention to the embodiments disclosed in this specification, but should be interpreted as including all equivalent schemes that a person skilled in the art can foresee by applying their general knowledge to implement the teachings just disclosed.

Claims

1. A DC-DC conversion device (800), comprising: A first DC-DC converter and a second DC-DC converter (112a, 112b), each comprising: Inverter (202a, 202b), the inverter is designed to convert the input voltage (V IN a,V IN b) converting into a first AC intermediate voltage (V1~a, V1~b), a resonant circuit (204a, 204b), the resonant circuit comprising a transformer (Ta, Tb), and a capacitor (Ca, Cb) and an inductor (La, Lb) connected in series with a primary coil (Pa, Pb) of the transformer (Ta, Tb) and the first intermediate voltage (V1-a, V1-b), and A rectifier (206a, 206b) is designed to convert a second AC intermediate voltage (V2-a, V2-b) present at the secondary winding (Sa, Sb) of the transformer (Ta, Tb) into an output voltage (V OUT ), the secondary coil (Sa, Sb) of the transformer (Ta, Tb) having at least two terminals (S1a, S2a, Ma, S1b, S2b, Mb); Output capacitor (C OUT ), the output capacitor is designed to have the output voltage (V OUT );as well as A loop (B) for each of the transformers (Ta, Tb), the loop extending from one terminal (S1a, S2a, Ma, S1b, S2b, Mb) of the secondary winding (Sa, Sb) of the transformer (Ta, Tb) to the other and passing through the output capacitor (C OUT ); It is characterized in that the output capacitor (C OUT ) are positioned so that each of the two loops (B) has a maximum inductance of 20nH.

2. The DC-DC converter (800) according to claim 1, wherein: The secondary coil (Sa, Sb) of each of the transformers (Ta, Tb) comprises a first end terminal (S1a, S1b), a second end terminal (S2a, S2b) and an intermediate terminal (Ma, Mb), and wherein the loop (B) passes through: a first switching element and a capacitor (C OUT ) and the first end terminal (S1a, S1b); and / or a second switching element and a capacitor (C OUT ) between the first terminal and the second end terminal (S2a, S2b).

3. The DC-DC converter (800) according to claim 1 or 2, wherein: The output capacitor (C OUT ) includes a plurality of capacitive elements.

4. The DC-DC converter (800) according to claim 3, wherein: The capacitive elements are connected in parallel and / or distributed in at least two arrangements.

5. The DC-DC converter (800) according to any one of claims 1 to 4, wherein: At least one of the terminals (S1a, S2a, Ma, S1b, S2b, Mb) of the secondary coil (Sa, Sb) of a first transformer among the transformers (Ta, Tb) is separated from at least one of the terminals (S1a, S2a, Ma, S1b, S2b, Mb) of the secondary coil (Sa, Sb) of another transformer among the transformers (Ta, Tb) by a maximum of 3 cm.

6. The DC-DC converter (800) according to any one of claims 1 to 5, wherein: There is a quadrilateral (Q), wherein the four vertices are respectively located at the pin of the first end terminal (S1a) of the secondary coil (Sa) of the first transformer (Ta), the pin of the second end terminal (S2a) of the secondary coil (Sa) of the first transformer (Ta), the pin of the first end terminal (S1b) of the secondary coil (Sb) of the second transformer (Tb), and the pin of the second end terminal (S2b) of the secondary coil (Sb) of the second transformer (Tb), and the output capacitor (C OUT ) extends within this quadrilateral (Q).

7. The DC-DC converter (800) according to any one of claims 1 to 6, wherein: The transformers (Ta, Tb) are carried by the same electronic board (1102), being located on the same side of said board.

8. An electrical system comprising: a first DC voltage source and a second DC voltage source; as well as The DC-DC conversion device (800) according to any one of claims 1 to 7, wherein the inverter of the first DC-DC converter (112a) is connected to the first DC voltage source so as to receive its input voltage (V IN a), and wherein the inverter of the second DC-DC converter (112b) is connected to the second DC voltage source so as to receive its input voltage (V IN b).

9. A motor vehicle (100) comprising a DC-DC conversion device (800) according to any one of claims 1 to 7 or indeed an electrical system according to claim 8.

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