Bidirectional DCDC system

Abstract

The utility model provides a bidirectional DCDC system. The bidirectional DCDC system comprises a first switch tube plate, a second switch tube plate, a third switch tube plate and a fourth switch tube plate, according to the invention, the switch tube and the driving related device thereof are independently designed on the independent daughter board, so that the influence of heat generated by the switch tube on other devices can be effectively reduced. Meanwhile, the design has high reusability, the maintenance time can be shortened, replacement of a novel device can be rapidly achieved, and therefore the updating period of a product is shortened. In addition, a stable and economical upgrading port is provided for replacing the switching tube in the future, and the development cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of switching power supplies, and in particular to a bidirectional DCDC system. Background Art

[0002] In a switching power supply, the working efficiency and stability of the switch tube are crucial to the overall performance of the power supply system. However, there are several problems in the existing switching power supply design, which have an adverse impact on the reliability, maintainability and update and upgrade of the switching power supply.

[0003] First, the switch tube generates a lot of heat during normal operation. If this heat cannot be effectively dissipated, it will affect the switch tube itself and other devices around it, and may cause other electronic components to work unstably or fail. Especially in high-power application scenarios, the heating problem of the switch tube is more significant, and heat accumulation will significantly reduce the stability and life of the entire power system.

[0004] Secondly, when a switching power supply fails, the switch tube and the series of devices it drives are easily damaged, and since these devices are often integrated on the main circuit board, they are difficult to repair. Replacing the faulty device usually requires professional maintenance operations, resulting in high maintenance costs and long maintenance time. In addition, after the switch tube and its drive circuit fail, the entire power supply system may not be able to operate normally, further affecting the reliability of the equipment.

[0005] In addition, with the continuous development of new switch tubes and their driving circuit technology, more reliable and economical new devices will appear on the market. However, due to the high integration of existing switching power supply designs, when new devices need to be replaced, the entire circuit board often needs to be redesigned and developed. This design limitation prolongs the product replacement cycle and is not conducive to the company's rapid response to market demand. Utility Model Content

[0006] In view of this, the purpose of this application is to provide a bidirectional DCDC system, which can effectively reduce the impact of heat generated by the switch tube on other devices by designing the switch tube and its driving related devices separately on an independent sub-board. At the same time, the replacement and maintenance of the sub-board are more convenient and quick, with strong reusability, which can not only shorten the maintenance time, but also quickly realize the replacement of new devices.

[0007] In a first aspect, an embodiment of the present application provides a bidirectional DCDC system, comprising a first switch tube board, a second switch tube board, a third switch tube board, and a fourth switch tube board;

[0008] The first switch tube plate is provided with a first switch tube unit and a third switch tube unit connected in series; the second switch tube plate is provided with a second switch tube unit and a fourth switch tube unit connected in series;

[0009] The first switch tube board and the second switch tube board are connected in parallel and arranged between the primary coil of the transformer and the low-voltage battery side; the primary coil of the transformer is respectively connected to the series node between the first switch tube unit and the third switch tube unit, and the series node between the second switch tube unit and the fourth switch tube unit;

[0010] The third switch tube plate is provided with a fifth switch tube unit and a seventh switch tube unit connected in series; the fourth switch tube plate is provided with a sixth switch tube unit and an eighth switch tube unit connected in series;

[0011] The third switch tube plate and the fourth switch tube plate are connected in parallel and arranged between the secondary coil of the transformer and the output high voltage side; the secondary coil of the transformer is respectively connected to the series node between the fifth switch tube unit and the seventh switch tube unit, and the series node between the sixth switch tube unit and the eighth switch tube unit.

[0012] In combination with the first aspect, the embodiment of the present application provides a first possible implementation manner of the first aspect, in which a driving circuit, a first switching tube and a second switching tube are provided in each switching tube unit;

[0013] The first switch tube is connected in parallel with the second switch tube;

[0014] The driving circuit is connected to the first switch tube and the second switch tube respectively.

[0015] In combination with the first aspect, the embodiment of the present application provides a second possible implementation of the first aspect, wherein the driving circuit includes a driving chip, and a driving signal of the driving chip is provided by an independent signal processing chip;

[0016] The positive output terminal and the negative output terminal of the driving chip are connected to the first switch tube and the second switch tube respectively.

[0017] In combination with the first aspect, the embodiment of the present application provides a third possible implementation of the first aspect, wherein the driver chip is a SILM5350SADCM-DG chip.

[0018] In combination with the first aspect, the embodiment of the present application provides a fourth possible implementation of the first aspect, wherein a first electrolytic capacitor, a first film capacitor, and a battery voltage sampling device are arranged in parallel between the low-voltage battery side and the switch tube plate;

[0019] A battery current sampling device is arranged in series between the low-voltage battery side and the switch tube plate.

[0020] In combination with the first aspect, the embodiment of the present application provides a fifth possible implementation of the first aspect, in which, on the secondary side of the transformer:

[0021] A second electrolytic capacitor, a second film capacitor and an output voltage sampling device are arranged in parallel between the output high voltage side and the switch tube plate;

[0022] An output current sampling device is arranged in series between the output high voltage side and the switch tube board;

[0023] A resonant cavity current sampling device is arranged between the secondary coil of the transformer and the switch sub-board.

[0024] In combination with the first aspect, the embodiment of the present application provides a sixth possible implementation of the first aspect, wherein the bidirectional DCDC system further includes an auxiliary power board;

[0025] The auxiliary power board is provided with a first DCDC converter, a second DCDC converter and a third DCDC converter;

[0026] The first DCDC converter, the second DCDC converter and the third DCDC converter are connected in series;

[0027] The first DCDC converter is provided with a battery to supply power to the second DCDC converter and the third DCDC converter;

[0028] The second DCDC converter drives and supplies power to the fifth switch tube unit, the sixth switch tube unit, the seventh switch tube unit, and the eighth switch tube unit respectively;

[0029] The third DCDC converter drives and supplies power to the first switch tube unit, the second switch tube unit, the third switch tube unit, and the fourth switch tube unit respectively.

[0030] In combination with the first aspect, the embodiment of the present application provides a seventh possible implementation of the first aspect, wherein the first DCDC converter includes a first flyback transformer;

[0031] The second DCDC converter includes a second flyback transformer;

[0032] The third DCDC converter includes a plurality of third flyback transformers.

[0033] In combination with the first aspect, the embodiment of the present application provides an eighth possible implementation of the first aspect, wherein the primary coil of the first flyback transformer is connected to the battery, and the secondary coil is connected to the primary coil of the second flyback transformer;

[0034] The secondary side of the second flyback transformer is provided with a first feedback winding and a plurality of second feedback windings;

[0035] The first feedback winding is respectively connected to the primary coil of each of the third flyback transformers;

[0036] Each of the second feedback windings is connected to a switch tube unit in the third switch tube board or the fourth switch tube board;

[0037] The secondary winding of each of the third flyback transformers is connected to a switch tube unit in the first switch tube board or the second switch tube board.

[0038] In combination with the first aspect, the embodiment of the present application provides a ninth possible implementation of the first aspect, wherein the auxiliary power board further includes a first low voltage dropout linear regulator, a second low voltage dropout linear regulator, and a third low voltage dropout linear regulator;

[0039] An input terminal of the first low voltage dropout linear regulator is connected to the first feedback winding;

[0040] The output end of the first low voltage dropout linear regulator is connected to the input end of the second low voltage dropout linear regulator and the input end of the third low voltage dropout linear regulator respectively;

[0041] The output end of the second low voltage drop linear regulator supplies power to the IO of the signal processing chip and external devices;

[0042] The output end of the third low voltage difference linear regulator supplies power to the core of the signal processing chip.

[0043] A bidirectional DCDC system provided in an embodiment of the present application includes a first switch tube board, a second switch tube board, a third switch tube board and a fourth switch tube board; a first switch tube unit and a third switch tube unit connected in series are arranged in the first switch tube board; a second switch tube unit and a fourth switch tube unit connected in series are arranged in the second switch tube board; the first switch tube board and the second switch tube board are connected in parallel and arranged between the primary coil of the transformer and the low-voltage battery side; the primary coil of the transformer is respectively connected to the series node between the first switch tube unit and the third switch tube unit, and the series node between the second switch tube unit and the fourth switch tube unit; the third switch tube board is provided with a fifth switch tube unit and a seventh switch tube unit connected in series; the fourth switch tube board is provided with a sixth switch tube unit and an eighth switch tube unit connected in series; the third switch tube board and the fourth switch tube board are connected in parallel and arranged between the secondary coil of the transformer and the output high-voltage side; the secondary coil of the transformer is respectively connected to the series node between the fifth switch tube unit and the seventh switch tube unit, and the series node between the sixth switch tube unit and the eighth switch tube unit. By designing the switch tube and its driving related components separately on an independent sub-board, the impact of the heat generated by the switch tube on other components can be effectively reduced. At the same time, the replacement and maintenance of the sub-board is more convenient and quick, with strong reusability, which can not only shorten the maintenance time, but also quickly realize the replacement of new components. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of a bidirectional DCDC system provided by an embodiment of the utility model;

[0046] Figure 2 A schematic diagram of the structure of a switch tube plate provided in an embodiment of the utility model;

[0047] Figure 3 A schematic diagram of the structure of an auxiliary power board provided in an embodiment of the utility model;

[0048] Figure 4 A schematic structural diagram of another auxiliary power board provided in an embodiment of the utility model.

[0049] Legend:

[0050] 11-first switch tube board; 12-second switch tube board; 13-third switch tube board; 14-fourth switch tube board; 101-first switch tube unit; 103-third switch tube unit; 102-second switch tube unit; 104-fourth switch tube unit; 105-fifth switch tube unit; 107-seventh switch tube unit; 106-sixth switch tube unit; 108-eighth switch tube unit; 15-first electrolytic capacitor; 16-first film capacitor; 17-battery voltage sampling device; 18-battery current sampling device; 19-second electrolytic capacitor; 110-second Film capacitor; 111-output voltage sampling device; 112-output current sampling device; 113-resonant cavity current sampling device; 21-driving circuit; 22-first switch tube; 23-second switch tube; 211-driving chip; 31-first DCDC converter; 32-second DCDC converter; 33-third DCDC converter; 301-first flyback transformer; 302-second flyback transformer; 303-third flyback transformer; 41-first low voltage difference linear regulator; 42-second low voltage difference linear regulator; 43-third low voltage difference linear regulator. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] In the description of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0055] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0056] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Considering that the existing switch tube generates a lot of heat during normal operation. If this heat cannot be effectively dissipated, it will affect the switch tube itself and other devices around it, and may cause other electronic components to work unstably or fail. Especially in high-power application scenarios, the heating problem of the switch tube is more significant, and heat accumulation will significantly reduce the stability and life of the entire power supply system. When the switching power supply fails, the switch tube and a series of devices driven by it are easily damaged, and since these devices are often integrated on the main circuit board, they are difficult to repair. Replacing the faulty device usually requires professional maintenance operations, resulting in high maintenance costs and long time. In addition, after the switch tube and its drive circuit fail, the entire power supply system may not be able to operate normally, further affecting the reliability of the equipment. With the continuous development of new switch tube and its drive circuit technology, more reliable and economical new devices will appear on the market. However, due to the high integration of the existing switching power supply design, when a new device needs to be replaced, the entire circuit board often needs to be redesigned and developed. This design limitation prolongs the product replacement cycle and is not conducive to the company's rapid response to market demand.

[0058] See also Figure 1 , Figure 1 A schematic diagram of the structure of a bidirectional DCDC system provided in this embodiment.

[0059] like Figure 1 As shown in , a bidirectional DCDC system provided in this embodiment includes: a first switch tube board 11, a second switch tube board 12, a third switch tube board 13 and a fourth switch tube board 14. The first switch tube board 11 is provided with a first switch tube unit 101 and a third switch tube unit 103; the second switch tube board 12 is provided with a second switch tube unit 102 and a fourth switch tube unit 104; the third switch tube board 13 is provided with a fifth switch tube unit 105 and a seventh switch tube unit 107; the fourth switch tube board 14 is provided with a sixth switch tube unit 106 and an eighth switch tube unit 108.

[0060] Here, in the first switch tube board 11, the first switch tube unit 101 is connected in series with the third switch tube unit 103, in the second switch tube board 12, the second switch tube unit 102 is connected in series with the fourth switch tube unit 104; in the third switch tube board 13, the fifth switch tube unit 105 is connected in series with the seventh switch tube unit 107; in the fourth switch tube board 14, the sixth switch tube unit 106 is connected in series with the eighth switch tube unit 108.

[0061] Among them, the first switch tube board 11 and the second switch tube board 12 are connected in parallel and arranged between the primary coil of the transformer and the low-voltage battery side; the primary coil of the transformer is respectively connected to the series node between the first switch tube unit 101 and the third switch tube unit 103, and the series node between the second switch tube unit 102 and the fourth switch tube unit 104; the third switch tube board 13 and the fourth switch tube board 14 are connected in parallel and arranged between the secondary coil of the transformer and the output high-voltage side; the secondary coil of the transformer is respectively connected to the series node between the fifth switch tube unit 105 and the seventh switch tube unit 107, and the series node between the sixth switch tube unit 106 and the eighth switch tube unit 108.

[0062] It should be noted that the first switch tube board 11, the second switch tube board 12, the third switch tube board 13, the fourth switch tube board 14, and the switch tube units included in each switch tube board can all have the same structure and use the same type of devices. At the same time, a power interface can be reserved on each switch tube board, and the isolated power supply and control signal required by each switch tube board are provided through the reserved power interface.

[0063] Furthermore, on the primary side of the transformer, a first electrolytic capacitor 15, a first film capacitor 16, and a battery voltage sampling device 17 are arranged in parallel between the low-voltage battery side and the switch tube board; a battery current sampling device 18 is arranged in series between the low-voltage battery side and the switch tube board. On the secondary side of the transformer, a second electrolytic capacitor 19, a second film capacitor 110, and an output voltage sampling device 111 are arranged in parallel between the output high-voltage side and the switch tube board; an output current sampling device 112 is arranged in series between the output high-voltage side and the switch tube board; and a resonant cavity current sampling device 113 is arranged between the secondary coil of the transformer and the switch sub-board.

[0064] Here, the low-voltage side battery voltage is 50V-60V, and the output high-voltage side voltage is 300V-550V.

[0065] A bidirectional DCDC system provided in an embodiment of the present application includes a first switch tube board, a second switch tube board, a third switch tube board and a fourth switch tube board; a first switch tube unit and a third switch tube unit connected in series are arranged in the first switch tube board; a second switch tube unit and a fourth switch tube unit connected in series are arranged in the second switch tube board; the first switch tube board and the second switch tube board are connected in parallel and arranged between the primary coil of the transformer and the low-voltage battery side; the primary coil of the transformer is respectively connected to the series node between the first switch tube unit and the third switch tube unit, and the series node between the second switch tube unit and the fourth switch tube unit; the third switch tube board is provided with a fifth switch tube unit and a seventh switch tube unit connected in series; the fourth switch tube board is provided with a sixth switch tube unit and an eighth switch tube unit connected in series; the third switch tube board and the fourth switch tube board are connected in parallel and arranged between the secondary coil of the transformer and the output high-voltage side; the secondary coil of the transformer is respectively connected to the series node between the fifth switch tube unit and the seventh switch tube unit, and the series node between the sixth switch tube unit and the eighth switch tube unit. By designing the switch tube and its driving related components separately on an independent sub-board, the impact of the heat generated by the switch tube on other components can be effectively reduced. At the same time, the replacement and maintenance of the sub-board is more convenient and quick, with strong reusability, which can not only shorten the maintenance time, but also quickly realize the replacement of new components.

[0066] See also Figure 2 , Figure 2 A schematic diagram of the structure of a switch tube plate provided in this embodiment.

[0067] like Figure 2 As shown in , each switch tube board includes two switch tube units, and each switch tube unit is provided with a driving circuit 21, a first switch tube 22 and a second switch tube 23. A driving chip 211 is provided in the driving circuit 21.

[0068] Here, the first switch tube 22 and the second switch tube 23 are connected in parallel, the drive circuit 21 is connected to the first switch tube 22 and the second switch tube 23 respectively, the positive output end of the drive chip 211 is connected to the first switch tube 22 and the second switch tube 23 respectively, and the negative output end of the drive chip 211 is connected to the first switch tube 22 and the second switch tube 23 respectively.

[0069] It should be noted that the driving signal of the driving chip 211 is provided by an independent signal processing chip, and the signal processing chip can be set on an independently developed signal processing sub-board. The signal processing sub-board can be developed according to actual needs, and this is not described in detail. Similar to the switch tube sub-board, the signal processing sub-board also reserves a power interface. The signal processing sub-board sends the driving signal to the driving chip 211 through the reserved power interface via the reserved power interface on the switch tube sub-board, and processes the sampled data.

[0070] Preferably, the model of the driver chip 211 is SILM5350SADCM-DG chip.

[0071] See also Figure 3 , Figure 3 A schematic diagram of the structure of an auxiliary power board provided in this embodiment.

[0072] like Figure 3 As shown in the figure, the auxiliary power board is provided with a first DCDC converter 31, a second DCDC converter 32 and a third DCDC converter 33; the first DCDC converter 31 includes a first flyback transformer 301; the second DCDC converter 32 includes a second flyback transformer 302; the third DCDC converter 33 includes multiple third flyback transformers 303.

[0073] Specifically, the first DCDC converter 31, the second DCDC converter 32 and the third DCDC converter 33 are connected in series; a battery is provided in the first DCDC converter 31, and the first DCDC converter 31 supplies power to the second DCDC converter 32 and the third DCDC converter 33; the second DCDC converter 32 drives and supplies power to the fifth switch tube unit 105, the sixth switch tube unit 106, the seventh switch tube unit 107 and the eighth switch tube unit 108 respectively; the third DCDC converter 33 drives and supplies power to the first switch tube unit 101, the second switch tube unit 102, the third switch tube unit 103 and the fourth switch tube unit 104 respectively.

[0074] Here, the primary coil of the first flyback transformer 301 is connected to the battery, and the secondary coil is connected to the primary coil of the second flyback transformer 302; the secondary side of the second flyback transformer 302 is provided with a first feedback winding and multiple second feedback windings; the first feedback winding is respectively connected to the primary coil of each third flyback transformer 303; each second feedback winding is connected to a switch tube unit in the third switch tube board 13 or the fourth switch tube board 14; the secondary winding of each third flyback transformer 303 is connected to a switch tube unit in the first switch tube board 11 or the second switch tube board 12.

[0075] See also Figure 4 , Figure 4 A schematic diagram of the structure of another auxiliary power board provided in this embodiment.

[0076] like Figure 4 As shown in the figure, the auxiliary power board is provided with a first DCDC converter 31, a second DCDC converter 32 and a third DCDC converter 33; the first DCDC converter 31 includes a first flyback transformer 301; the second DCDC converter 32 includes a second flyback transformer 302; the third DCDC converter 33 includes a plurality of third flyback transformers 303. It also includes a first low voltage dropout linear regulator 41, a second low voltage dropout linear regulator 42 and a third low voltage dropout linear regulator 43.

[0077] Specifically, the input end of the first low-voltage difference linear regulator 41 is connected to the first feedback winding on the secondary side of the second flyback transformer 302; the output end of the first low-voltage difference linear regulator 41 is respectively connected to the input ends of the second low-voltage difference linear regulator 42 and the third low-voltage difference linear regulator 43; the output end of the second low-voltage difference linear regulator 42 is used to power the IO of the signal processing chip and external devices in the signal processing sub-board; the output end of the third low-voltage difference linear regulator 43 is used to power the core of the signal processing chip in the signal processing sub-board.

[0078] It should be noted that, similar to the switch tube board and the signal processing sub-board, the auxiliary power board also has a reserved power interface. The auxiliary power board provides auxiliary power to the switch tube board and the signal processing sub-board through the reserved power interface via the reserved power interface on the switch tube board and the signal processing sub-board.

[0079] A bidirectional DCDC system provided in an embodiment of the present application includes a first switch tube board, a second switch tube board, a third switch tube board and a fourth switch tube board; a first switch tube unit and a third switch tube unit connected in series are arranged in the first switch tube board; a second switch tube unit and a fourth switch tube unit connected in series are arranged in the second switch tube board; the first switch tube board and the second switch tube board are connected in parallel and arranged between the primary coil of the transformer and the low-voltage battery side; the primary coil of the transformer is respectively connected to the series node between the first switch tube unit and the third switch tube unit, and the series node between the second switch tube unit and the fourth switch tube unit; the third switch tube board is provided with a fifth switch tube unit and a seventh switch tube unit connected in series; the fourth switch tube board is provided with a sixth switch tube unit and an eighth switch tube unit connected in series; the third switch tube board and the fourth switch tube board are connected in parallel and arranged between the secondary coil of the transformer and the output high-voltage side; the secondary coil of the transformer is respectively connected to the series node between the fifth switch tube unit and the seventh switch tube unit, and the series node between the sixth switch tube unit and the eighth switch tube unit. By designing the switch tube and its driving related components separately on an independent sub-board, the impact of the heat generated by the switch tube on other components can be effectively reduced. At the same time, the replacement and maintenance of the sub-board is more convenient and quick, with strong reusability, which can not only shorten the maintenance time, but also quickly realize the replacement of new components.

[0080] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A bidirectional DCDC system, characterized in that: It includes a first switch tube plate, a second switch tube plate, a third switch tube plate and a fourth switch tube plate; The first switch tube plate is provided with a first switch tube unit and a third switch tube unit connected in series; the second switch tube plate is provided with a second switch tube unit and a fourth switch tube unit connected in series; The first switch tube board and the second switch tube board are connected in parallel and arranged between the primary coil of the transformer and the low-voltage battery side; the primary coil of the transformer is respectively connected to the series node between the first switch tube unit and the third switch tube unit, and the series node between the second switch tube unit and the fourth switch tube unit; The third switch tube plate is provided with a fifth switch tube unit and a seventh switch tube unit connected in series; the fourth switch tube plate is provided with a sixth switch tube unit and an eighth switch tube unit connected in series; The third switch tube plate and the fourth switch tube plate are connected in parallel and arranged between the secondary coil of the transformer and the output high voltage side; the secondary coil of the transformer is respectively connected to the series node between the fifth switch tube unit and the seventh switch tube unit, and the series node between the sixth switch tube unit and the eighth switch tube unit.

2. The bidirectional DCDC system according to claim 1, characterized in that: In each switch tube unit, a driving circuit, a first switch tube and a second switch tube are provided; The first switch tube is connected in parallel with the second switch tube; The driving circuit is connected to the first switch tube and the second switch tube respectively.

3. The bidirectional DCDC system according to claim 2, characterized in that: The driving circuit includes a driving chip, and the driving signal of the driving chip is provided by an independent signal processing chip; The positive output end of the driving chip is connected to the first switch tube and the second switch tube respectively; the negative output end of the driving chip is connected to the first switch tube and the second switch tube respectively.

4. The bidirectional DCDC system according to claim 3, characterized in that: The driver chip is a SILM5350SADCM-DG chip.

5. The bidirectional DCDC system according to claim 1, characterized in that: On the primary side of the transformer: A first electrolytic capacitor, a first film capacitor and a battery voltage sampling device are arranged in parallel between the low-voltage battery side and the switch tube plate; A battery current sampling device is arranged in series between the low-voltage battery side and the switch tube plate.

6. The bidirectional DCDC system according to claim 1, characterized in that: On the secondary side of the transformer: A second electrolytic capacitor, a second film capacitor and an output voltage sampling device are arranged in parallel between the output high voltage side and the switch tube plate; An output current sampling device is arranged in series between the output high voltage side and the switch tube board; A resonant cavity current sampling device is arranged between the secondary coil of the transformer and the switch sub-board.

7. The bidirectional DCDC system according to claim 1, characterized in that: The bidirectional DCDC system also includes an auxiliary power supply board; The auxiliary power board is provided with a first DCDC converter, a second DCDC converter and a third DCDC converter; The first DCDC converter, the second DCDC converter and the third DCDC converter are connected in series; The first DCDC converter is provided with a battery to supply power to the second DCDC converter and the third DCDC converter; The second DCDC converter drives and supplies power to the fifth switch tube unit, the sixth switch tube unit, the seventh switch tube unit, and the eighth switch tube unit respectively; The third DCDC converter drives and supplies power to the first switch tube unit, the second switch tube unit, the third switch tube unit, and the fourth switch tube unit respectively.

8. The bidirectional DCDC system according to claim 7, characterized in that: The first DCDC converter includes a first flyback transformer; The second DCDC converter includes a second flyback transformer; The third DCDC converter includes a plurality of third flyback transformers.

9. The bidirectional DCDC system according to claim 8, characterized in that: The primary coil of the first flyback transformer is connected to the battery, and the secondary coil is connected to the primary coil of the second flyback transformer; The secondary side of the second flyback transformer is provided with a first feedback winding and a plurality of second feedback windings; The first feedback winding is respectively connected to the primary coil of each of the third flyback transformers; Each of the second feedback windings is connected to a switch tube unit in the third switch tube board or the fourth switch tube board; The secondary winding of each of the third flyback transformers is connected to a switch tube unit in the first switch tube board or the second switch tube board.

10. The bidirectional DCDC system according to claim 9, characterized in that: The auxiliary power board also includes a first low voltage dropout linear regulator, a second low voltage dropout linear regulator and a third low voltage dropout linear regulator; An input terminal of the first low voltage dropout linear regulator is connected to the first feedback winding; The output end of the first low voltage dropout linear regulator is connected to the input end of the second low voltage dropout linear regulator and the input end of the third low voltage dropout linear regulator respectively; The output end of the second low voltage drop linear regulator supplies power to the IO of the signal processing chip and external devices; The output end of the third low voltage difference linear regulator supplies power to the core of the signal processing chip.

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