Vehicle-mounted DC / DC six-way CLLC resonance circuit, transformer and vehicle

Abstract

The utility model relates to the field of vehicle-mounted circuits, in particular to a vehicle-mounted DC / DC six-way CLLC resonance circuit, a transformer and a vehicle. Comprising a control circuit and a CLLC resonance circuit, and the control circuit controls the CLLC resonance circuit to input and output different voltages in a vehicle-mounted environment; the CLLC resonance circuit comprises a main transformer T and three power tube group circuits, and each power tube group circuit can be used as input and output through a control signal; and different control signals are output according to the input port and the required voltage to control the power tube driving module to drive the high-voltage power tube group, the 48v power tube group and the 12v power tube group to perform six-direction DC / DC conversion. The CLLC resonance circuit is used for carrying out voltage conversion, the soft switching control characteristic is achieved, interconversion of high voltage, 48v and 12v can be carried out on an internal circuit of the electric automobile, and meanwhile switching loss is reduced.

Description

Technical Field

[0001] The utility model relates to the field of vehicle-mounted circuits, and in particular to a vehicle-mounted DC / DC six-way CLLC resonant circuit and a transformer. Background Art

[0002] In recent years, with the booming electric vehicle industry, onboard electronic devices have shown a trend toward miniaturization, integration, and high power density. In particular, onboard chargers and DC / DC converters, as core components for power conversion throughout electric vehicles, urgently require miniaturization and high integration. Furthermore, with the increasing penetration of 48V systems in electric vehicle electrical systems, electric vehicle electrical systems often operate at high voltages, with both 48V and 12V coexisting. However, existing electrical integration solutions can only achieve the single function of battery charging at a single voltage, failing to meet the diverse demands of today.

[0003] How to convert high voltage, 48V and 12V in the internal circuits of electric vehicles is an urgent problem to be solved in the existing technology. Utility Model Content

[0004] To solve the problems in the prior art, the embodiments of this specification provide an on-board DC / DC six-way CLLC resonant circuit and transformer, an HV / 48V / 12V six-way DC / DC conversion circuit, which uses a CLLC resonant circuit for voltage conversion and has the characteristics of soft switching control, so that the internal circuits of electric vehicles can convert high voltage, 48V and 12V to each other, while also reducing switching losses.

[0005] The embodiments of this specification provide a vehicle-mounted DC / DC six-way CLLC resonant circuit, including: a control circuit and a CLLC resonant circuit;

[0006] The control circuit includes a linear power supply, a controller, and a power tube drive module;

[0007] The CLLC resonant circuit includes a main transformer T and three power tube group circuits: a high-voltage power tube group, a 48V power tube group, and a 12V power tube group, wherein a diode is connected in parallel to the power tube in each power tube group circuit;

[0008] The power tube driving module is connected to the three power tube group circuits to control the switching on and off of each power tube in each power tube group circuit;

[0009] The controller controls the power tube driving module to drive the high-voltage power tube group, the 48V power tube group and the 12V power tube group to perform six-way DC / DC conversion according to the input port and the required voltage.

[0010] Furthermore, the control circuit also includes a low-dropout linear regulator, a network transceiver, an A / D converter, a sensor and peripheral circuits.

[0011] Furthermore, the high-voltage power tube group includes power tubes S1-S4, capacitor Cr1, inductor Lr1 and capacitor C1;

[0012] The 48V power tube group includes power tubes S5-S8, capacitor Cr2, inductor Lr2 and capacitor C2;

[0013] The 12V power tube group includes power tubes S9-S12, capacitor Cr3, inductor Lr3 and capacitor C3.

[0014] Furthermore, when the high-voltage power tube group is the input end, the power tube driving module controls the power tubes S1-S4 in the high-voltage power tube group to be in a conducting state;

[0015] If a 48V voltage is required to be output, the high-voltage power tube group and the 48V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube driver module controls the power tubes S5-S8 in the 48V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C2 stabilizes the rectified current for filtering, and the 48V voltage is output;

[0016] If a 12V voltage needs to be output, the high-voltage power tube group and the 12V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S9-S12 in the 12V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C3 stabilizes the rectifier current for filtering, and outputs the 12V voltage.

[0017] Furthermore, when the 48V power tube group is the input end, the power tube driving module controls the power tubes S5-S8 in the 48V power tube group to be in a conducting state;

[0018] If a high voltage voltage needs to be output, the 48V power tube group and the high-voltage power tube group perform CLLC resonance, the main transformer T performs forward isolation and boosting, and the power tube drive module controls the power tubes S1-S4 in the high-voltage power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C1 filters the rectified current, and outputs the high voltage voltage;

[0019] If a 12V voltage needs to be output, the 48V power tube group and the 12V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S9-S12 in the 12V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C3 stabilizes the rectifier current for filtering, and outputs the 12V voltage.

[0020] Furthermore, when the 12V power tube group is the input end, the power tube driving module controls the power tubes S9-S12 in the 12V power tube group to be in a conducting state;

[0021] If a high voltage is required to be output, the 12V power tube group and the high-voltage power tube group perform CLLC resonance, the main transformer T performs forward isolation and boosting, and the power tube drive module controls the power tubes S1-S4 in the high-voltage power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C1 stabilizes the rectified current for filtering, and outputs the high voltage voltage;

[0022] If a 48V voltage needs to be output, the 12V power tube group and the 48V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S4-S8 in the 48V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C2 stabilizes the rectifier current for filtering, and outputs the 48V voltage.

[0023] Furthermore, the bulk capacitance in the high-voltage power tube group, the 48V power tube group, and the 12V power tube group puts the power tubes S1 to S12 in a ZVS state.

[0024] The embodiments of this specification also provide a transformer including an on-vehicle DC / DC six-way CLLC resonant circuit.

[0025] The embodiments of this specification also provide a vehicle, including a vehicle body and a transformer;

[0026] The transformer is located inside the vehicle body;

[0027] The transformer is used for performing six-way DC / DC conversion.

[0028] In the embodiments of this specification, the six-way conversion circuit mainly includes a control circuit and a CLLC resonant circuit, wherein the control circuit includes a linear power supply, a controller, and a power tube driver module, thereby controlling the CLLC resonant circuit to input and output different voltages in a vehicle environment; the CLLC resonant circuit includes a main transformer T and three power tube group circuits, each power tube in the power tube group circuit is connected in parallel with a diode, and each power tube group circuit is controlled to be both input and output by controlling the conduction and shutdown of the diode and the power tube; the control circuit connects the three power tube group circuits through the power tube driver module, controls the shutdown and conduction of each power tube in each power tube group circuit, and outputs different control signals according to the input port and the required voltage to control the power tube driver module to drive the high-voltage power tube group, the 48V power tube group, and the 12V power tube group to perform six-way DC / DC conversion. The CLLC resonant circuit is used for voltage conversion and has the characteristics of soft switching control, so that the internal circuit of the electric vehicle can convert between high voltage, 48V and 12V, while also reducing switching losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 The figure shows an on-vehicle DC / DC six-way CLLC resonant circuit according to an embodiment of this specification;

[0031] Figure 2 The figure shows a schematic diagram of the structure of a vehicle-mounted DC / DC six-way CLLC resonant circuit according to an embodiment of this specification;

[0032] Figure 3 The figure shows the working diagram of the on-board DC / DC six-way CLLC resonant circuit of the embodiment of this specification when the high-voltage power tube group is used as the input end;

[0033] Figure 4 The figure shows the working diagram of the vehicle-mounted DC / DC six-way CLLC resonant circuit according to the embodiment of this specification when the 48V power tube group is used as the input end;

[0034] Figure 5 The figure shows the working diagram of the vehicle-mounted DC / DC six-way CLLC resonant circuit according to the embodiment of this specification when the 12V power tube group is used as the input end.

[0035] [Description of Reference Numerals]

[0036] 1. Control circuit;

[0037] 101. Linear power supply;

[0038] 102. Controller;

[0039] 103. Power tube driver module;

[0040] 2. CLLC resonant circuit;

[0041] 201, main transformer;

[0042] 202. High-voltage power tube group;

[0043] 203, 48v power tube group;

[0044] 204, 12v power tube set. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this specification.

[0046] like Figure 1 The embodiment of this specification shows an on-vehicle DC / DC six-way CLLC resonant circuit, including: a control circuit 1 and a CLLC resonant circuit 2;

[0047] The control circuit 1 includes a linear power supply 101, a controller 102, and a power tube driving module 103;

[0048] The CLLC resonant circuit 2 includes a main transformer 201 and three power tube group circuits: a high-voltage power tube group 202, a 48V power tube group 203, and a 12V power tube group 204. A diode is connected in parallel to the power tube in each power tube group circuit.

[0049] The power tube driving module 103 is connected to the three power tube group circuits and controls the switching on and off of each power tube in each power tube group circuit;

[0050] The controller 102 controls the power tube driving module 103 to drive the high-voltage power tube group 202 , the 48V power tube group 203 and the 12V power tube group 204 to perform six-way DC / DC conversion according to the input port and the required voltage.

[0051] In the embodiments of this specification, the six-way conversion circuit mainly includes a control circuit and a CLLC resonant circuit, wherein the control circuit includes a linear power supply, a controller, and a power tube driver module, thereby controlling the CLLC resonant circuit to input and output different voltages in a vehicle environment; the CLLC resonant circuit includes a main transformer T and three power tube group circuits, each power tube in the power tube group circuit is connected in parallel with a diode, and each power tube group circuit is controlled to be both input and output by controlling the conduction and shutdown of the diode and the power tube; the control circuit connects the three power tube group circuits through the power tube driver module, controls the shutdown and conduction of each power tube in each power tube group circuit, and outputs different control signals according to the input port and the required voltage to control the power tube driver module to drive the high-voltage power tube group, the 48V power tube group, and the 12V power tube group to perform six-way DC / DC conversion. The CLLC resonant circuit is used for voltage conversion and has the characteristics of soft switching control, so that the internal circuit of the electric vehicle can convert between high voltage, 48V and 12V, while also reducing switching losses.

[0052] In the embodiments of this specification, Figure 2 The figure shows a schematic diagram of the structure of the vehicle-mounted DC / DC six-way CLLC resonant circuit according to an embodiment of the present specification. The control circuit further includes a low-dropout linear regulator, a network transceiver, an A / D converter, a sensor, and peripheral circuits.

[0053] The high-voltage power tube group includes power tubes S1-S4, capacitor Cr1, inductor Lr1 and capacitor C1;

[0054] The 48V power tube group includes power tubes S5-S8, capacitor Cr2, inductor Lr2 and capacitor C2;

[0055] The 12V power tube group includes power tubes S9-S12, capacitor Cr3, inductor Lr3 and capacitor C3.

[0056] Using the embodiments of this specification, by Figure 2The circuit structure described in the preceding text converts voltage between the onboard charger's main circuit and the power battery pack, based on the rated voltage used by different electric vehicles. The onboard charger's main circuit with an integrated DC / DC converter includes a control circuit 1 and a CLLC resonant circuit 2. The CLLC resonant circuit 2 includes a high-voltage power transistor group 202, a 48V power transistor group 203, and a 12V power transistor group 204. When the onboard charger's main circuit receives a charging input at the rated voltage, the high-voltage power transistor group 202 transfers energy to the 48V power transistor group 203 and the 12V power transistor group 204 via the main transformer T, charging the 48V and 12V batteries. Simultaneously, during vehicle operation, the 48V and 12V power modules can also utilize the high voltage output of the onboard charger's main circuit via the CLLC resonant circuit. At the same time, in another embodiment of the present specification, in actual application, a pure electric vehicle may fail to start due to a loss of power in the main motor. In this case, a high voltage can be fed back to the main circuit of the on-board charger through the 48V and 12V batteries through the CLLC resonant circuit, so that the vehicle can be started and driven briefly in an emergency.

[0057] In the embodiment of this specification, in order to enable the 48V and 12V power modules and batteries to be charged and operated by the high voltage of the main circuit, as shown in FIG. Figure 3 As shown, when the high-voltage power tube group is the input end, the power tube driving module controls the power tubes S1-S4 in the high-voltage power tube group to be in the on state;

[0058] If a 48V voltage is required to be output, the high-voltage power tube group and the 48V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube driver module controls the power tubes S5-S8 in the 48V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C2 stabilizes the rectified current for filtering, and the 48V voltage is output;

[0059] If a 12V voltage needs to be output, the high-voltage power tube group and the 12V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S9-S12 in the 12V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C3 stabilizes the rectifier current for filtering, and outputs the 12V voltage.

[0060] In the embodiment of the present specification, when the vehicle is in a normal charging state, the rated voltage of the vehicle is input by the main circuit, and the main transformer T converts the high-voltage current in the high-voltage power tube group into a voltage and current of 48V and / or 12V, and outputs it to the on-board 48V battery and 12V battery. At the same time, the 12V power tube group outputs a 12V voltage and can also directly act on the on-board lighting module, control module and other modules; the 48V power tube group outputs a 48V voltage and can also directly act on the on-board blower module, steering motor and other modules, thereby ensuring that if the 12V battery or the 48V battery is exhausted while the vehicle is driving, the power in the high-voltage battery can also be called upon to perform normal operation.

[0061] In the embodiment of this specification, in order to enable the 12V power module and the battery to be charged and operated through the 48V voltage circuit, or when the main motor is out of power and the vehicle cannot be started and low voltage feedback is required, such as Figure 4 As shown, when the 48V power tube group is the input end, the power tube driving module controls the power tubes S5-S8 in the 48V power tube group to be in the on state;

[0062] If a high voltage voltage needs to be output, the 48V power tube group and the high-voltage power tube group perform CLLC resonance, the main transformer T performs forward isolation and boosting, and the power tube drive module controls the power tubes S1-S4 in the high-voltage power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C1 filters the rectified current, and outputs the high voltage voltage;

[0063] If a 12V voltage needs to be output, the 48V power tube group and the 12V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S9-S12 in the 12V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C3 stabilizes the rectifier current for filtering, and outputs the 12V voltage.

[0064] In an embodiment of the present specification, if the vehicle is unable to be charged and the main battery is depleted, the 48v battery can output a 48v voltage to the CLLC resonant circuit, and the main transformer T converts the 48v voltage and current in the 48v voltage power tube group into a high-voltage voltage and current, and feeds it back to the high-voltage battery, thereby ensuring that the vehicle can be started in an emergency; at the same time, in another embodiment of the present specification, if it is impossible to connect to a charging pile with a normal vehicle rated voltage for charging, it can also be connected to a 48v charging device for emergency charging, and the main transformer T converts the 48v voltage and current in the 48v voltage power tube group into a high-voltage voltage and current to charge the high-voltage battery, ensuring that pure electric vehicles can be charged even in the absence of a high-voltage charging pile.

[0065] In another embodiment of the present specification, when the 48V power tube group is the input end, the main transformer T converts the 48V current in the 48V power tube group into a 12V voltage and current, and outputs it to the on-board 48V battery and the 12V battery; at the same time, in order to ensure the normal use of various functions during vehicle driving, if the 12V battery is exhausted, the power in the 48V battery can also be called upon to perform normal operation.

[0066] In the embodiment of this specification, in order to make the vehicle unable to operate normally due to the loss of power of the 48V battery or the high-voltage battery, low-voltage feedback can be obtained, such as Figure 5 As shown, when the 12V power tube group is the input end, the power tube driving module controls the power tubes S9-S12 in the 12V power tube group to be in the on state;

[0067] If a high voltage is required to be output, the 12V power tube group and the high-voltage power tube group perform CLLC resonance, the main transformer T performs forward isolation and boosting, and the power tube drive module controls the power tubes S1-S4 in the high-voltage power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C1 stabilizes the rectified current for filtering, and outputs the high voltage voltage;

[0068] If a 48V voltage needs to be output, the 12V power tube group and the 48V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S4-S8 in the 48V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C2 stabilizes the rectifier current for filtering, and outputs the 48V voltage.

[0069] In an embodiment of the present specification, if the vehicle is unable to be charged and the main battery is depleted, the 12v battery can output a 12v voltage to the CLLC resonant circuit, and the main transformer T converts the 12v voltage and current in the 12v voltage power tube group into a high-voltage voltage and current or a 48v voltage and current, and feeds it back to the high-voltage battery or the 48v battery, thereby ensuring that the vehicle can be started in an emergency; at the same time, in another embodiment of the present specification, if it is impossible to connect to a charging pile with a normal vehicle rated voltage for charging, a 12v charging device can also be connected for emergency charging, and the main transformer T converts the 12v voltage and current in the 12v voltage power tube group into a high-voltage voltage and current and a 48v voltage and current to charge the high-voltage battery and the 48v battery, ensuring that pure electric vehicles can be charged even without a high-voltage charging pile.

[0070] In the embodiment of this specification, in order to reduce the switching loss of the power tube, the body capacitance in the high-voltage power tube group, the 48V power tube group and the 12V power tube group puts the power tubes S1-S12 in a ZVS (Zero Voltage Switch) state.

[0071] The embodiments of this specification also include a transformer including an on-vehicle DC / DC six-way CLLC resonant circuit.

[0072] The embodiments of this specification also include a vehicle, including a vehicle body and a transformer;

[0073] The transformer is located inside the vehicle body;

[0074] The transformer is used for performing six-way DC / DC conversion.

[0075] It should be understood that in the various embodiments of this specification, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this specification.

[0076] It should also be understood that in the embodiments of this specification, the term "and / or" is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this specification generally indicates that the associated objects are in an "or" relationship.

[0077] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this specification can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this specification.

[0078] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0079] In the several embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or can be an electrical, mechanical or other form of connection.

[0080] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this specification.

[0081] In addition, the functional units in the various embodiments of this specification may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0082] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this specification is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this specification. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0083] Specific embodiments are used in this specification to illustrate the principles and implementation methods of this specification. The description of the above embodiments is only used to help understand the methods and core ideas of this specification. At the same time, for those skilled in the art, based on the ideas of this specification, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting this specification.

Claims

1. A vehicle-mounted DC / DC six-way CLLC resonant circuit, characterized in that: include: Control circuit and CLLC resonant circuit; The control circuit includes a linear power supply, a controller, and a power tube drive module; The CLLC resonant circuit includes a main transformer T and three power tube group circuits: a high-voltage power tube group, a 48V power tube group, and a 12V power tube group, wherein a diode is connected in parallel to the power tube in each power tube group circuit; The power tube driving module is connected to the three power tube group circuits to control the switching on and off of each power tube in each power tube group circuit; The controller controls the power tube driving module to drive the high-voltage power tube group, the 48V power tube group and the 12V power tube group to perform six-way DC / DC conversion according to the input port and the required voltage.

2. The vehicle-mounted DC / DC six-way CLLC resonant circuit according to claim 1, characterized in that: The control circuit further includes a low voltage difference linear regulator, a network transceiver, an A / D converter, a sensor and peripheral circuits.

3. The vehicle-mounted DC / DC six-way CLLC resonant circuit according to claim 1, characterized in that: The high-voltage power tube group includes power tubes S1-S4, capacitor Cr1, inductor Lr1 and capacitor C1; The 48V power tube group includes power tubes S5-S8, capacitor Cr2, inductor Lr2 and capacitor C2; The 12V power tube group includes power tubes S9-S12, capacitor Cr3, inductor Lr3 and capacitor C3.

4. The vehicle-mounted DC / DC six-way CLLC resonant circuit according to claim 3, characterized in that: When the high-voltage power tube group is the input end, the power tube driving module controls the power tubes S1-S4 in the high-voltage power tube group to be in a conducting state; If a 48V voltage is required to be output, the high-voltage power tube group and the 48V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube driver module controls the power tubes S5-S8 in the 48V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C2 stabilizes the rectified current for filtering, and outputs a 48V voltage; If a 12V voltage needs to be output, the high-voltage power tube group and the 12V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S9-S12 in the 12V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C3 stabilizes the rectifier current for filtering, and outputs a 12V voltage.

5. The vehicle-mounted DC / DC six-way CLLC resonant circuit according to claim 3, characterized in that: When the 48V power tube group is the input end, the power tube driving module controls the power tubes S5-S8 in the 48V power tube group to be in the on state; If a high voltage voltage needs to be output, the 48V power tube group and the high-voltage power tube group perform CLLC resonance, the main transformer T performs forward isolation and boosting, and the power tube drive module controls the power tubes S1-S4 in the high-voltage power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C1 filters the rectified current, and outputs the high voltage voltage; If a 12V voltage needs to be output, the 48V power tube group and the 12V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S9-S12 in the 12V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C3 stabilizes the rectifier current for filtering, and outputs a 12V voltage.

6. The vehicle-mounted DC / DC six-way CLLC resonant circuit according to claim 3, characterized in that: When the 12V power tube group is the input end, the power tube driving module controls the power tubes S9-S12 in the 12V power tube group to be in a conducting state; If a high voltage is required to be output, the 12V power tube group and the high-voltage power tube group perform CLLC resonance, the main transformer T performs forward isolation and boosting, and the power tube drive module controls the power tubes S1-S4 in the high-voltage power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C1 stabilizes the rectified current for filtering, and outputs the high voltage voltage; If a 48V voltage is required to be output, the 12V power tube group and the 48V power tube group perform CLLC resonance, the main transformer T performs forward isolation and voltage reduction, and the power tube drive module controls the power tubes S4-S8 in the 48V power tube group to be in the off state; the body diode performs full-bridge rectification, the capacitor C2 stabilizes the rectifier current for filtering, and outputs a 48V voltage.

7. The vehicle-mounted DC / DC six-way CLLC resonant circuit according to claim 1, characterized in that: The bulk capacitance in the high-voltage power tube group, the 48V power tube group and the 12V power tube group puts the power tubes in a ZVS state.

8. A transformer, characterized in that: It comprises the on-vehicle DC / DC six-way CLLC resonant circuit as described in any one of claims 1 to 7.

9. A vehicle, characterized in that: comprising a vehicle body and the transformer according to claim 8; The transformer is located inside the vehicle body; The transformer is used for performing six-way DC / DC conversion.

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