Active relief system and automobile

Abstract

The present invention discloses an active discharge system and a car. The active discharge system includes a bus capacitor, a DCDC module, an H-bridge arm circuit and a charging circuit module; the DCDC module is connected to the bus capacitor and is used to output a first discharge current when the bus capacitor is in a discharge condition; the H-bridge arm circuit is connected to the DCDC module and is used to convert the first discharge current from DC to AC and output a second discharge current; the H-bridge arm circuit includes a first single-phase bridge arm in a first full-bridge circuit of a motor controller and a second single-phase bridge arm in a second full-bridge circuit of a generator controller; the charging circuit module is connected to the H-bridge arm circuit and is used to store energy corresponding to the second discharge current. This technical solution can reduce the circuit complexity of the active discharge system and reduce the circuit cost.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to an active discharge system and an automobile. Background Art

[0002] With the development of automobiles, the automobile industry has entered a new stage of large-scale development. However, automobile safety issues frequently occur, and the high-voltage safety of automobiles has gradually become a concern for people when buying cars.

[0003] To ensure the safety of consumers' lives and property, the car needs to quickly discharge the DC high-voltage circuit every time the car is powered off, when the system fails, or when the car collides. For example, the discharge requires the DC high-voltage circuit to be discharged to below 60V within 3S. However, in the related technology, it is usually necessary to design a special discharge circuit to realize the active discharge of the DC high-voltage circuit, which not only increases the complexity of the circuit structure, but also greatly increases the cost of discharge. Summary of the invention

[0004] The embodiments of the present invention provide an active discharge system and a vehicle to solve the problem of complex structure of the current vehicle discharge circuit.

[0005] An active discharge system includes a bus capacitor, a DCDC module, an H-bridge arm circuit and a charging circuit module;

[0006] The DCDC module is connected to the bus capacitor and is used to output a first discharge current when the bus capacitor is in a discharge condition;

[0007] The H-bridge arm circuit is connected to the DCDC module and the bus capacitor, and is used to convert the first discharge current into an alternating current and output a second discharge current; the H-bridge arm circuit includes a first full-bridge circuit in the motor controller and a second full-bridge circuit in the generator controller;

[0008] The charging circuit module is connected to the H-bridge arm circuit and is used to store energy corresponding to the second discharge current.

[0009] Further, the bus capacitor includes a first bus capacitor and a second bus capacitor;

[0010] One end of the first bus capacitor is connected to the first end of the DCDC module, and the other end of the first bus capacitor is connected to the second end of the DCDC module;

[0011] One end of the second bus capacitor is connected to the third end of the DCDC module, and the other end of the second bus capacitor is connected to the fourth end of the DCDC module;

[0012] The third end and the fourth end of the DCDC module are connected to the H-bridge arm circuit.

[0013] Furthermore, the H-bridge arm circuit includes a first full-bridge circuit, a second full-bridge circuit and a working mode switching switch;

[0014] The first connection end of the first full-bridge circuit is connected to the third end of the DCDC module, the second connection end of the second full-bridge circuit is connected to the fourth end of the DCDC module, and the charging connection end of the first full-bridge circuit is connected to the charging circuit module;

[0015] The first connection end of the second full-bridge circuit is connected to the third end of the DCDC module, the second connection end of the second full-bridge circuit is connected to the fourth end of the DCDC module, and the charging connection end of the second full-bridge circuit is connected to the charging circuit module;

[0016] The operating mode switching switch is arranged between the charging connection end of the first full-bridge circuit and the charging circuit module, or between the charging connection end of the second full-bridge circuit and the charging circuit module.

[0017] Further, the first full-bridge circuit includes N first single-phase bridge arms, each of the first single-phase bridge arms includes a first upper bridge switch tube and a first lower bridge switch tube connected in series, the first ends of the N first upper bridge switch tubes are connected together to form a first connection end of the first full-bridge circuit, the second ends of the N first lower bridge switch tubes are connected together to form a second connection end of the first full-bridge circuit, and the connection node between the first upper bridge switch tube and the first lower bridge switch tube is a charging connection end of the first full-bridge circuit;

[0018] The second full-bridge circuit includes N second single-phase bridge arms, each of the second single-phase bridge arms includes a second upper bridge switch tube and a second lower bridge switch tube connected in series, the first ends of the N second upper bridge switch tubes are connected together to form a first connection end of the second full-bridge circuit, the second ends of the N second lower bridge switch tubes are connected together to form a second connection end of the second full-bridge circuit, and the connection node between the first upper bridge switch tube and the second lower bridge switch tube is a charging connection end of the second full-bridge circuit;

[0019] Any one of the N first single-phase bridge arms and any one of the N second single-phase bridge arms form the H bridge arm circuit, wherein N≥1.

[0020] Furthermore, the active discharge system also includes a control module, which is connected to the operating condition switching switch, the first full-bridge circuit and the second full-bridge circuit, and is used to control the operation of the operating condition switching switch, the switch tube in the first full-bridge circuit and the switch tube in the second full-bridge circuit.

[0021] Furthermore, the control module is used to control the operating condition switching switch to be turned on when the bus capacitor is in a discharge condition, and control the first upper bridge switch tube, the first lower bridge switch tube, the second upper bridge switch tube and the second lower bridge switch tube in the H-bridge arm circuit to work to form a discharge loop; when the bus capacitor is not in a discharge condition, the operating condition switching switch is disconnected, and the N first upper bridge switch tubes and the N first lower bridge switch tubes are controlled to work to form a motor control loop, and the N second upper bridge switch tubes and the N second lower bridge switch tubes are controlled to work to form a generator control loop.

[0022] Furthermore, the charging circuit module includes a transformer circuit and an energy storage battery circuit;

[0023] The transformer circuit is connected to the H-bridge arm circuit, and is used to receive the second discharge current output by the H-bridge arm circuit, and output a third discharge current;

[0024] The energy storage battery circuit is connected to the transformer circuit and is used to store energy corresponding to the third discharge current.

[0025] Further, the energy storage battery circuit includes a first diode, a second diode, a first filter capacitor and an energy storage battery;

[0026] The anode of the first diode is connected to the first output end of the transformer circuit, and the cathode of the first diode is connected to the positive electrode of the energy storage battery;

[0027] The anode of the second diode is connected to the second output terminal of the transformer circuit, and the cathode of the second diode is connected to the positive electrode of the energy storage battery;

[0028] The negative electrode of the energy storage battery is connected to the third output terminal of the transformer circuit;

[0029] The first end of the first filter capacitor is connected to the positive electrode of the energy storage battery, and the second end of the first filter capacitor is connected to the negative electrode of the energy storage battery.

[0030] Furthermore, the active discharge system further comprises a battery module, wherein the battery module is connected to a first end and a second end of the DCDC module;

[0031] The charging circuit module also includes a charging switch circuit, a first end of the charging switch circuit is connected to the fourth output end of the transformer circuit, a second end of the charging switch circuit is connected to the fifth output end of the transformer circuit, a third end of the charging switch circuit is connected to the positive pole of the battery module, and a fourth end of the charging switch circuit is connected to the negative pole of the battery module.

[0032] Furthermore, the charging switch circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;

[0033] The first switch tube and the second switch tube are connected in series, and a connection node between the first switch tube and the second switch tube forms a first end of the charging switch circuit;

[0034] The third switch tube is connected to the fourth switch tube, and a connection node between the third switch tube and the fourth switch tube forms a second end of the charging switch circuit;

[0035] The first end of the first switch tube and the first end of the third switch tube are connected together to form a third end of the charging switch circuit;

[0036] The second end of the second switch tube and the second end of the fourth switch tube are connected together to form a fourth end of the charging switch circuit.

[0037] Furthermore, the active discharge system also includes a charging interface module; a first end of the charging interface module is connected to the positive electrode of the battery module, a second end of the charging interface module is connected to the negative electrode of the battery module, and a third end of the charging interface module is connected to the H-bridge arm circuit.

[0038] Further, the charging interface module includes a DC charging circuit, an AC charging circuit, a second switch, a third switch and a fourth switch;

[0039] The positive electrode of the DC charging circuit is connected to the positive electrode of the battery module through the second switch, and the negative electrode of the DC charging circuit is connected to the negative electrode of the battery module through the third switch;

[0040] The L pole of the AC charging circuit is connected to the positive pole of the battery module through the second switch, and the N pole of the AC charging circuit is connected to the H bridge arm circuit through the fourth switch;

[0041] The positive pole of the DC charging circuit is the first end of the charging interface module, the negative pole of the DC charging circuit is the second end of the charging interface module, and the N pole of the AC charging circuit is the third end of the charging interface module.

[0042] A car comprises the above-mentioned active discharge system.

[0043] The above-mentioned active discharge system and automobile, the active discharge system includes a bus capacitor, a DCDC module, an H-bridge arm circuit and a charging circuit module, the DCDC module is connected to the bus capacitor, the H-bridge arm circuit is connected to the DCDC module and the bus capacitor, and the charging circuit module is connected to the H-bridge arm circuit. When the bus capacitor is in a discharge condition, the DCDC module can output the energy in the bus capacitor in the form of a first discharge current, and the H-bridge arm circuit is used to convert the first discharge current into an alternating current to output a second discharge current, so that after receiving the second discharge current output by the H-bridge arm circuit, the charging circuit module stores the energy corresponding to the second discharge current to realize the active discharge process, greatly improve the speed of active discharge of the automobile, and at the same time use the bus capacitor, the DCDC module, the H-bridge arm circuit and the charging circuit module for active discharge, and use the original first full-bridge circuit and the second full-bridge circuit in the automobile to form an H-bridge arm circuit, which can avoid adding additional discharge circuits, reduce the circuit complexity of the active discharge system, and reduce the circuit cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0045] Figure 1 is a circuit diagram of an active discharge system in one embodiment of the present invention;

[0046] Figure 2 is another circuit diagram of the active discharge system in one embodiment of the present invention.

[0047] In the figure: 11, battery module; 12, DCDC module; 13, H-bridge arm circuit; 131, first full-bridge circuit; 132, second full-bridge circuit; 14, charging circuit module; 141, transformer circuit; 142, energy storage battery circuit; 15, charging switch circuit; 16, charging interface module; 17, control module. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0049] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0050] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0051] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0052] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0053] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0054] This embodiment provides an active discharge system, which is applied to an automobile. When the automobile meets the discharge conditions, the electric quantity of the DC high-voltage circuit is discharged to below 60V, thereby improving the safety of the automobile. For example, the discharge conditions may be that the automobile has a major collision, the high-voltage connector in the DC high-voltage circuit of the automobile is unplugged, or the high-voltage high-voltage electronic control product has a cover opened.

[0055] This embodiment provides an active discharge system, such as Figure 1 As shown, the active discharge system includes a bus capacitor, a DCDC module 12, an H-bridge arm circuit 13 and a charging circuit module 14; the DCDC module 12 is connected to the bus capacitor and is used to output a first discharge current when the bus capacitor is in a discharge condition; the H-bridge arm circuit 13 is connected to the DCDC module 12 and the bus capacitor, and is used to convert the first discharge current into an alternating current and output a second discharge current; the H-bridge arm circuit 13 includes a first full-bridge circuit 131 in the motor controller and a second full-bridge circuit 132 in the generator controller; the charging circuit module 14 is connected to the H-bridge arm circuit 13, and is used to store energy corresponding to the second discharge current.

[0056] Among them, the discharge condition is a condition in which the energy in the bus capacitor needs to be released within a certain period of time. For example, when a car breaks down, it is necessary to reduce the voltage of the bus capacitor to below 60V within 5 seconds. Exemplarily, it can be determined whether the discharge condition is met based on the current vehicle data; if the current vehicle data meets the discharge condition, the bus capacitor is in the discharge condition; if the current vehicle data does not meet the discharge condition, the bus capacitor is not in the discharge condition. The current vehicle data is the data related to the car collected at the current moment, which is used to determine whether the discharge condition is met, thereby determining whether it is in the discharge condition.

[0057] The first discharge current is the current discharged by the DCDC module 12 when the bus capacitor is in a discharge condition. The first discharge current is the current that needs to be discharged obtained by converting the energy stored in the bus capacitor. For example, the first discharge current is direct current. The second discharge current is the current obtained after the H bridge arm circuit 13 converts the first discharge current from direct current to alternating current. For example, the second discharge current is alternating current.

[0058] As an example, when the bus capacitor is in a discharge condition, the energy stored in the bus capacitor can be converted into a first discharge current. Specifically, the energy stored in at least one bus capacitor can be output in the form of direct current to achieve active discharge.

[0059] As an example, the DCDC module 12 is connected to the bus capacitor, and is used to output a first discharge current when the bus capacitor is in a discharge condition. In this example, when the bus capacitor is in a discharge condition, the energy stored in at least one bus capacitor can be output in the form of direct current, that is, the first discharge current is output.

[0060] As an example, the active discharge system also includes an H-bridge arm circuit 13, which is connected to the DCDC module 12 and the bus capacitor, and is used to convert the first discharge current into an alternating current (DC), and output a second discharge current. For example, the H-bridge arm circuit 13 converts the first discharge current into an alternating current (DC), and outputs a second discharge current. It should be noted that the H-bridge arm circuit 13 in this example includes at least two full-bridge circuits that implement different functions. Exemplarily, the H-bridge arm circuit 13 can reuse a first single-phase bridge arm in the first full-bridge circuit 131 of the motor controller and a second single-phase bridge arm in the second full-bridge circuit 132 of the engine controller. In this example, since the original first full-bridge circuit 131 and the second full-bridge circuit 132 in the automobile will not be in a working state when the bus capacitor is in a discharge condition, an H-bridge arm circuit 13 can be formed by reusing a first single-phase bridge arm in the original first full-bridge circuit 131 and a second single-phase bridge arm in the second full-bridge circuit 132 in the automobile, and the first discharge current is converted from DC to AC through the H-bridge arm circuit 13 to output the second discharge current, thereby avoiding the addition of an additional discharge circuit, thereby reducing the circuit complexity of the active discharge system and reducing the circuit cost.

[0061] As an example, Figure 1 As shown, the first full-bridge circuit 131 is a three-phase full-bridge circuit in a motor controller, and the second full-bridge circuit 132 is a three-phase full-bridge circuit in a generator controller, or the first full-bridge circuit 131 is a three-phase full-bridge circuit in a generator controller, and the second full-bridge circuit 132 is a three-phase full-bridge circuit in a motor controller.

[0062] As an example, the first full-bridge circuit 131 is a three-phase full-bridge circuit in a motor controller in a car, and the second full-bridge circuit 132 is a three-phase full-bridge circuit in a generator controller. Exemplarily, the first full-bridge circuit 131 includes three first single-phase bridge arms, and the second full-bridge circuit 132 includes three second single-phase bridge arms. Any one of the first single-phase bridge arms in the first full-bridge circuit 131 forms an H-bridge arm circuit 13 with any one of the second single-phase bridge arms in the second full-bridge circuit 132, converts the first discharge current from DC to AC, and outputs the second discharge current. It should be noted that when the bus capacitor is in the discharge condition, the three-phase full-bridge circuit in the motor controller and the three-phase full-bridge circuit in the generator controller are not in working state, therefore, it is feasible to reuse the power devices in the first full-bridge circuit 131 and the second full-bridge circuit 132 to form the H-bridge arm circuit 13.

[0063] In this embodiment, the first full-bridge circuit 131 is a three-phase full-bridge circuit in the motor controller, and the second full-bridge circuit 132 is a three-phase full-bridge circuit in the generator controller. When the bus capacitor is in a discharge condition, the three-phase full-bridge circuit in the motor controller and the three-phase full-bridge circuit in the generator controller are not in a working state. Therefore, any one of the first single-phase bridge arms in the first full-bridge circuit 131 and any one of the second single-phase bridge arms in the second full-bridge circuit 132 can form an H bridge arm circuit 13, thereby avoiding the addition of an additional discharge circuit.

[0064] As an example, the active discharge system further includes a charging circuit module 14, which is connected to the H-bridge arm circuit 13 and is used to store energy corresponding to the second discharge current. In this example, after receiving the second discharge current output by the H-bridge arm circuit 13, the charging circuit module 14 stores the energy corresponding to the second discharge current, that is, stores the energy released by the bus capacitor. Exemplarily, the specific time can range from 0 to 5 seconds. Preferably, the specific time is 3 seconds.

[0065] The active discharge system provided in this embodiment includes a bus capacitor, a DCDC module 12, an H-bridge arm circuit 13 and a charging circuit module 14. The DCDC module 12 is connected to the bus capacitor, the H-bridge arm circuit 13 is connected to the DCDC module 12 and the bus capacitor, and the charging circuit module 14 is connected to the H-bridge arm circuit 13. When the bus capacitor is in a discharge condition, the DCDC module 12 can output the energy stored in the bus capacitor in the form of a first discharge current. The H-bridge arm circuit 13 is used to convert the first discharge current into an alternating current and output a second discharge current. After receiving the second discharge current output by the H-bridge arm circuit 13, the charging circuit module 14 stores the energy corresponding to the second discharge current, thereby greatly improving the speed of active discharge of the automobile. The original bus capacitor, DCDC module 12, H-bridge arm circuit 13 and charging circuit module 14 of the automobile are used to realize active discharge of the automobile, thereby reducing the circuit complexity of the active discharge system and reducing the circuit cost.

[0066] In one embodiment, if Figure 1 As shown, the bus capacitor includes a first bus capacitor C1 and a second bus capacitor C2; one end of the first bus capacitor C1 is connected to the first end of the DCDC module 12, and the other end of the first bus capacitor C1 is connected to the second end of the DCDC module 12; one end of the second bus capacitor C2 is connected to the third end of the DCDC module 12, and the other end of the second bus capacitor C2 is connected to the fourth end of the DCDC module 12; the third end and the fourth end of the DCDC module 12 are connected to the H bridge arm circuit 13.

[0067] As an example, Figure 1 As shown, the bus capacitor includes a first bus capacitor C1 and a second bus capacitor C2. The first and second ends of the DCDC module 12 are connected to the battery module 11; the third and fourth ends of the DCDC module 12 are connected to the H-bridge arm circuit 13; one end of the first bus capacitor C1 is connected to the first end of the DCDC module 12, and the other end of the first bus capacitor C1 is connected to the second end of the DCDC module 12; one end of the second bus capacitor C2 is connected to the third end of the DCDC module 12, and the other end of the second bus capacitor C2 is connected to the fourth end of the DCDC module 12.

[0068] As an example, a first end of the DCDC module 12 is connected to the positive electrode of the battery module 11 , and a second end of the DCDC module 12 is connected to the negative electrode of the battery module 11 .

[0069] As an example, the battery module 11 includes a power battery BAT1, a first main positive switch S1, a first main negative switch S3 and a first fuse F1. The positive electrode of the power battery BAT1 is connected to the first end of the first fuse F1, and the second end of the first fuse F1 is connected to the DCDC module 12 through the first main positive switch S1. The negative electrode of the power battery BAT1 is connected to the DCDC module 12 through the first main negative switch S3.

[0070] As an example, the DCDC module 12 includes a first control tube Q1, a second control tube Q2, a third control tube Q3 and a fourth control tube Q4. In this example, the second end of the first control tube Q1 is connected to the first end of the second control tube Q2, the second end of the third control tube Q3 is connected to the first end of the fourth control tube Q4, the second end of the second control tube Q2 is connected to the second end of the fourth control tube Q4, the connection node of the first control tube Q1 and the second control tube Q2 and the connection node of the third control tube Q3 and the fourth control tube Q4 are connected together to form the first end of the DCDC module 12, the first end of the first control tube Q1 and the first end of the third control tube Q3 are connected together to form the third end of the DCDC module 12, the second end of the second control tube Q2 is the second end of the DCDC module 12, the second end of the fourth control tube Q4 is the fourth end of the DCDC module 12, and the third ends of the first control tube Q1, the second control tube Q2, the third control tube Q3 and the fourth control tube Q4 are control ends.

[0071] Preferably, the first control tube Q1, the second control tube Q2, the third control tube Q3 and the fourth control tube Q4 are field effect transistors, and the first end of the first control tube Q1, the second control tube Q2, the third control tube Q3 and the fourth control tube Q4 is a source, the second end is a drain and the third end is a gate.

[0072] As an example, one end of the first bus capacitor C1 is connected to the first end of the DCDC module 12, and the other end of the first bus capacitor C1 is connected to the second end of the DCDC module 12; one end of the second bus capacitor C2 is connected to the third end of the DCDC module 12, and the other end of the second bus capacitor C2 is connected to the fourth end of the DCDC module 12. In this example, when the bus capacitor is in the discharge condition, the first bus capacitor C1 and the second bus capacitor C2 are used to filter the electrical signal flowing through the DCDC module 12. When the bus capacitor is in the discharge condition, the energy stored in the first bus capacitor C1 and the second bus capacitor C2 needs to be output in the form of a first discharge current to achieve active discharge.

[0073] As an example, the DCDC module 12 also includes a first power inductor L1 and a second power inductor L2. The first end of the first power inductor L1 is connected to the connection node of the first control tube Q1 and the second control tube Q2, and the second end of the first power inductor L1 is connected to the positive electrode of the battery module 11. The first end of the second power inductor L2 is connected to the connection node of the third control tube Q3 and the fourth control tube Q4, and the second end of the second power inductor L2 is connected to the positive electrode of the battery module 11. Exemplarily, the first power inductor L1 and the second power inductor L2 are used to filter noise, stabilize current, and suppress electromagnetic interference.

[0074] In this embodiment, the bus capacitor includes a first bus capacitor C1 and a second bus capacitor C2, and the first end and the second end of the DCDC module 12 are connected to the battery module 11; the third end and the fourth end of the DCDC module 12 are connected to the H-bridge arm circuit 13; one end of the first bus capacitor C1 is connected to the first end of the DCDC module 12, and the other end of the first bus capacitor C1 is connected to the second end of the DCDC module 12; one end of the second bus capacitor C2 is connected to the third end of the DCDC module 12, and the other end of the second bus capacitor C2 is connected to the fourth end of the DCDC module 12, so that the DCDC module 12 can output the energy stored in the first bus capacitor C1 and the second bus capacitor C2 in the form of a first discharge current, thereby avoiding the addition of an additional discharge circuit, reducing the circuit complexity of the active discharge system, and reducing the circuit cost.

[0075] In one embodiment, if Figure 1 As shown, the H-bridge arm circuit 13 includes a first full-bridge circuit 131, a second full-bridge circuit 132 and a working condition switching switch S8; the first connection end of the first full-bridge circuit 131 is connected to the third end of the DCDC module 12, and the second connection end of the first full-bridge circuit 131 is connected to the fourth end of the DCDC module 12; the charging connection end of the first full-bridge circuit 131 is connected to the charging circuit module 14; the first connection end of the second full-bridge circuit 132 is connected to the third end of the DCDC module 12, and the second connection end of the second full-bridge circuit 132 is connected to the fourth end of the DCDC module 12; the charging connection end of the second full-bridge circuit 132 is connected to the charging circuit module 14; the working condition switching switch S8 is arranged between the charging connection end of the first full-bridge circuit 131 and the charging circuit module 14, or between the charging connection end of the second full-bridge circuit 132 and the charging circuit module 14.

[0076] As an example, the first connection end of the first full-bridge circuit 131 is connected to the third end of the DCDC module 12, the second connection end of the first full-bridge circuit 131 is connected to the fourth end of the DCDC module 12, the charging connection end of the first full-bridge circuit 131 is connected to the charging circuit module 14, and the first connection end of the second full-bridge circuit 132 is connected to the third end of the DCDC module 12, the second connection end of the second full-bridge circuit 132 is connected to the fourth end of the DCDC module 12, and the charging connection end of the second full-bridge circuit 132 is connected to the charging circuit module 14, the first discharge current is converted from DC to AC, and the second discharge current is output, avoiding the addition of an additional discharge circuit, thereby improving the discharge speed, reducing the circuit complexity of the active discharge system, and reducing the circuit cost.

[0077] As another example, the working condition switching switch S8 is arranged between the charging connection end of the first full-bridge circuit 131 and the charging circuit module 14, or between the charging connection end of the second full-bridge circuit 132 and the charging circuit module 14. In this example, by arranging the working condition switching switch S8 between the charging connection end of the first full-bridge circuit 131 and the charging circuit module 14, or arranging the working condition switching switch S8 between the charging connection end of the second full-bridge circuit 132 and the charging circuit module 14, it is ensured that when the bus capacitor is in the discharge working condition, the working condition switching switch S8 is controlled to be turned on, so that the H-bridge arm circuit 13 can convert the first discharge current into AC and output the second discharge current; when the bus capacitor is not in the discharge working condition, the working condition switching switch S8 is controlled to be turned off, so that the first full-bridge circuit 131 and the second full-bridge circuit 132 do not enter the discharge circuit and perform their original functions.

[0078] In this embodiment, an H-bridge arm circuit 13 is formed by utilizing the first full-bridge circuit 131 and the second full-bridge circuit 132 originally provided in the automobile, and the first discharge current is converted from DC to AC to output the second discharge current, thereby avoiding adding an additional discharge circuit, improving the discharge speed, reducing the circuit complexity of the active discharge system, and reducing the circuit cost.

[0079] In one embodiment, if Figure 1As shown, the first full-bridge circuit 131 includes N first single-phase bridge arms, each of which includes a first upper bridge switch tube and a first lower bridge switch tube connected in series, the first ends of the N first upper bridge switch tubes are connected together to form a first connection end of the first full-bridge circuit 131, and the second ends of the N first lower bridge switch tubes are connected together to form a second connection end of the first full-bridge circuit 131, and the connection node between the first upper bridge switch tube and the first lower bridge switch tube is a charging connection end of the first full-bridge circuit 131; the second full-bridge circuit 132 includes N second single-phase bridge arms, each of which includes a first upper bridge switch tube and a first lower bridge switch tube connected in series. The arm includes a second upper bridge switch tube and a second lower bridge switch tube connected in series, the first ends of the N second upper bridge switch tubes are connected together to form a first connection end of the second full-bridge circuit 132, the second ends of the N second lower bridge switch tubes are connected together to form a second connection end of the second full-bridge circuit 132, and the connection node between the first upper bridge switch tube and the second lower bridge switch tube is a charging connection end of the second full-bridge circuit 132; any one of the N first single-phase bridge arms and any one of the N second single-phase bridge arms form an H bridge arm circuit 13, where N≥1.

[0080] Preferably, the first upper bridge switch tube, the first lower bridge switch tube, the second upper bridge switch tube and the second lower bridge switch tube are field effect transistors. The first end of the first upper bridge switch tube, the first lower bridge switch tube, the second upper bridge switch tube and the second lower bridge switch tube is a source, the second end is a gate and the third end is a control end.

[0081] As an example, the first full-bridge circuit 131 includes N first single-phase bridge arms, each first single-phase bridge arm includes a first upper bridge switch tube and a first lower bridge switch tube connected in series, the sources of the N first upper bridge switch tubes are connected in common to form the first connection end of the first full-bridge circuit 131, the drains of the N first lower bridge switch tubes are connected in common to form the second connection end of the first full-bridge circuit 131, and the connection node between the first upper bridge switch tube and the first lower bridge switch tube is the charging connection end of the first full-bridge circuit 131; the second full-bridge circuit 132 includes N second single-phase bridge arms, each second single-phase bridge arm includes a second upper bridge switch tube and a second lower bridge switch tube connected in series, the sources of the N second upper bridge switch tubes are connected in common to form the first connection end of the second full-bridge circuit 132, the drains of the N second lower bridge switch tubes are connected in common to form the second connection end of the second full-bridge circuit 132, and the connection node between the first upper bridge switch tube and the second lower bridge switch tube is the charging connection end of the second full-bridge circuit 132. In this example, by reusing the power devices in the original first full-bridge circuit 131 and the second full-bridge circuit 132 in the automobile, an H-bridge arm circuit 13 is formed, thereby realizing the function of active discharge, avoiding the addition of additional discharge circuits, reducing the circuit complexity of the active discharge system, and reducing the circuit cost.

[0082] In this example, the first full-bridge circuit 131 includes N first single-phase bridge arms, and the second full-bridge circuit 132 includes N second single-phase bridge arms. By making N≥1, the power devices in the first full-bridge circuit 131 and the second full-bridge circuit 132 can be reused to form an H-bridge arm circuit 13, thereby avoiding the addition of additional discharge circuits and reducing the circuit complexity of the active discharge system.

[0083] In one embodiment, if Figure 2 As shown, the active discharge system further includes a control module 17 , which is connected to the first full-bridge circuit 131 and the second full-bridge circuit 132 , respectively, and is used to control the operation of the switch tubes in the first full-bridge circuit 131 and the second full-bridge circuit 132 .

[0084] As an example, the control module 17 is respectively connected to the gate of the first upper bridge switch tube, the gate of the first lower bridge switch tube, the gate of the second upper bridge switch tube and the gate of the second lower bridge switch tube, and is used to control the conduction or shutdown of the first upper bridge switch tube, the first lower bridge switch tube, the second upper bridge switch tube and the second lower bridge switch tube.

[0085] As an example, Figure 2 As shown, the control module 17 is used to control the operating condition switching switch S8 to be turned on when the bus capacitor is in a discharge condition, and control the first upper bridge switch tube, the first lower bridge switch tube, the second upper bridge switch tube and the second lower bridge switch tube in the H bridge arm circuit 13 to work to form a discharge loop; when the bus capacitor is not in a discharge condition, the operating condition switching switch S8 is controlled to be disconnected, and the N first upper bridge switch tubes and the N first lower bridge switch tubes are controlled to work to form a motor control loop, and the N second upper bridge switch tubes and the N second lower bridge switch tubes are controlled to work to form a generator control loop.

[0086] Exemplarily, the first full-bridge circuit 131 includes three first single-phase bridge arms, and the second full-bridge circuit 132 includes three second single-phase bridge arms. When the bus capacitor is in the discharge working condition, the working condition switching switch S8 is controlled to be turned on, and the first upper bridge switch tube and the first lower bridge switch tube in any one of the three first single-phase bridge arms are controlled to be turned on, and the second upper bridge switch tube and the second lower bridge switch tube in any one of the three second single-phase bridge arms are controlled to be turned on, so as to form an H bridge arm circuit 13, avoid adding additional discharge circuits, and reduce the circuit complexity of the active discharge system. At the same time, since the motor and generator in the car are not in working state when the bus capacitor is in the discharge working condition, the first upper bridge switch tube and the first lower bridge switch tube of the other two first single-phase bridge arms in the first full-bridge circuit 131 are controlled to be disconnected, and the second upper bridge switch tube and the second lower bridge switch tube of the other two second single-phase bridge arms in the second full-bridge circuit 132 are controlled to be disconnected.

[0087] Exemplarily, when the bus capacitor is not in the discharge condition, the control module 17 controls the operating condition switching switch S8 to be disconnected, and controls the N first upper bridge switch tubes and the N first lower bridge switch tubes to be turned on, forming a motor control loop, and the motor works normally; controls the N second upper bridge switch tubes and the N second lower bridge switch tubes to work, forming a generator control loop, and the generator works normally.

[0088] In this embodiment, the control module 17 is connected to the operating mode switching switch S8, the first full-bridge circuit 131 and the second full-bridge circuit 132 respectively, so as to control the operation of the switch tubes in the operating mode switching switch S8, the first full-bridge circuit 131 and the second full-bridge circuit 132, thereby realizing active discharge and normal control of the original functions of the two full-bridge circuits.

[0089] In one embodiment, if Figure 1 As shown, the charging circuit module 14 includes a transformer circuit 141 and an energy storage battery circuit 142; the transformer circuit 141 is connected to the H-bridge arm circuit 13, and is used to receive the second discharge current output by the H-bridge arm circuit 13, and output a third discharge current; the energy storage battery circuit 142 is connected to the transformer circuit 141, and is used to store energy corresponding to the third discharge current.

[0090] The third discharge current is a signal obtained by converting the second discharge current. The third discharge current is alternating current.

[0091] As an example, the transformer circuit 141 is connected to the H-bridge arm circuit 13, and is used to receive the second discharge current output by the H-bridge arm circuit 13, and output the third discharge current. In this example, the transformer circuit 141 receives the second discharge current output by the H-bridge arm circuit 13, converts the second discharge current, and outputs a third discharge current of a suitable size.

[0092] As another example, the transformer circuit 141 includes a transformer T1, a second filter capacitor C5 and a third power inductor L4. The H-bridge arm circuit 13 includes a first full-bridge circuit 131, a second full-bridge circuit 132 and an operating mode switching switch S8. The first input end of the transformer circuit 141 is connected to the charging connection end of the first full-bridge circuit 131 through the third power inductor L4, and the second input end of the transformer circuit 141 is connected to the charging connection end of the second full-bridge circuit 132 through the second filter capacitor C5. The operating mode switching switch S8 is arranged between the charging connection end of the first full-bridge circuit 131 and the first input end of the transformer circuit 141, or between the charging connection end of the second full-bridge circuit 132 and the second input end of the transformer circuit 141. Exemplarily, the second discharge current can be converted into a third discharge current of appropriate size by adjusting the turns ratio of the transformer T1.

[0093] As an example, the energy storage battery circuit 142 is connected to the transformer circuit 141 to store energy corresponding to the third discharge current. In this embodiment, the transformer circuit 141 converts the second discharge current into a third discharge current of a suitable size, so that the energy storage battery circuit 142 stores the energy corresponding to the third discharge current, thereby realizing active discharge.

[0094] In this embodiment, the charging circuit module 14 includes a transformer circuit 141 and an energy storage battery circuit 142. By connecting the transformer circuit 141 to the H-bridge arm circuit 13 and connecting the energy storage battery circuit 142 to the transformer circuit 141, the second discharge current output by the H-bridge arm circuit 13 can be converted into a third discharge current, and the energy corresponding to the third discharge current is stored by the energy storage battery circuit 142, thereby realizing active discharge.

[0095] In one embodiment, if Figure 1 As shown, the energy storage battery circuit 142 includes a first diode D1, a second diode D2, a first filter capacitor C6 and an energy storage battery BAT2; the anode of the first diode D1 is connected to the first output end of the transformer circuit 141, and the cathode of the first diode D1 is connected to the positive electrode of the energy storage battery BAT2; the anode of the second diode D2 is connected to the second output end of the transformer circuit 141, and the cathode of the second diode D2 is connected to the positive electrode of the energy storage battery BAT2; the negative electrode of the energy storage battery BAT2 is connected to the third output end of the transformer circuit 141; the first end of the first filter capacitor C6 is connected to the positive electrode of the energy storage battery BAT2, and the second end of the first filter capacitor C6 is connected to the negative electrode of the energy storage battery BAT2.

[0096] As an example, the anode of the first diode D1 is connected to the first output terminal of the transformer circuit 141, and the cathode of the first diode D1 is connected to the positive electrode of the energy storage battery BAT2; the anode of the second diode D2 is connected to the second output terminal of the transformer circuit 141, and the cathode of the second diode D2 is connected to the positive electrode of the energy storage battery BAT2, and the negative electrode of the energy storage battery BAT2 is connected to the third output terminal of the transformer circuit 141, which is used to rectify the third discharge current output by the transformer circuit 141, that is, to convert the third discharge current (AC signal) into a DC signal, so that the energy storage battery BAT2 stores the energy corresponding to the DC signal. Preferably, the rated voltage of the energy storage battery BAT2 is 12V.

[0097] As an example, the transformer T1 includes a primary winding and a first secondary winding; the first end of the primary winding serves as the first input end of the transformer circuit 141, the second end of the primary winding serves as the second input end of the transformer circuit 141, the first end of the first secondary winding serves as the first output end of the transformer circuit 141, the second end of the first secondary winding serves as the second output end of the transformer circuit 141, and the middle tap of the first secondary winding serves as the third output end of the transformer circuit 141.

[0098] As another example, a first end of the first filter capacitor C6 is connected to the positive electrode of the energy storage battery BAT2, and a second end of the first filter capacitor C6 is connected to the negative electrode of the energy storage battery BAT2, for filtering the rectified DC signal.

[0099] In this embodiment, the energy storage battery circuit 142 includes a first diode D1, a second diode D2, a first filter capacitor C6 and an energy storage battery BAT2. By connecting the anode of the first diode D1 to the first output end of the transformer circuit 141, the cathode of the first diode D1 to the positive electrode of the energy storage battery BAT2, and connecting the anode of the second diode D2 to the second output end of the transformer circuit 141, the cathode of the second diode D2 to the positive electrode of the energy storage battery BAT2, and the negative electrode of the energy storage battery BAT2 to the third output end of the transformer circuit 141, the third discharge current is converted into direct current, so that the energy storage battery BAT2 stores energy corresponding to the direct current signal, thereby realizing active discharge.

[0100] In one embodiment, if Figure 2 As shown, the charging circuit module 14 also includes a charging switch circuit 15, a first end of the charging switch circuit 15 is connected to the fourth output end of the transformer circuit 141, a second end of the charging switch circuit 15 is connected to the fifth output end of the transformer circuit 141, a third end of the charging switch circuit 15 is connected to the positive electrode of the battery module 11, and a fourth end of the charging switch circuit 15 is connected to the negative electrode of the battery module 11.

[0101] As an example, the first end of the charging switch circuit 15 is connected to the fourth output end of the transformer circuit 141, the second end of the charging switch circuit 15 is connected to the fifth output end of the transformer circuit 141, the third end of the charging switch circuit 15 is connected to the positive electrode of the battery module 11, and the fourth end of the charging switch circuit 15 is connected to the negative electrode of the battery module 11. In this example, when the battery module 11 needs to be charged, the charging switch circuit 15 can be controlled to provide a basis for single-phase AC charging and three-phase AC charging of the battery module 11.

[0102] As an example, the battery module 11 includes a second main positive switch S2 and a second main negative switch S4. The third end of the charging switch circuit 15 is connected to the positive electrode of the battery module 11 through the second main positive switch S2. The fourth end of the charging switch circuit 15 is connected to the negative electrode of the battery module 11 through the second main negative switch S4.

[0103] As an example, the transformer T1 in the transformer circuit 141 further includes a second secondary winding, a first end of the second secondary winding serves as the fourth output end of the transformer circuit 141 , and a second end of the second secondary winding serves as the fifth output end of the transformer circuit 141 .

[0104] In one embodiment, if Figure 2 As shown, the charging switch circuit 15 includes a first switch tube B1, a second switch tube B2, a third switch tube B3 and a fourth switch tube B4; the first switch tube B1 and the second switch tube B2 are connected in series, and the connection node between the first switch tube B1 and the second switch tube B2 forms a first end of the charging switch circuit 15; the third switch tube B3 and the fourth switch tube B4 are connected, and the connection node between the third switch tube B3 and the fourth switch tube B4 forms a second end of the charging switch circuit 15; the first end of the first switch tube B1 and the first end of the third switch tube B3 are connected together to form a third end of the charging switch circuit 15; the second end of the second switch tube B2 and the second end of the fourth switch tube B4 are connected together to form a fourth end of the charging switch circuit 15.

[0105] As an example, the charging switch circuit 15 includes a first switch tube B1, a second switch tube B2, a third switch tube B3 and a fourth switch tube B4, the second end of the first switch tube B1 is connected to the first end of the second switch tube B2, and the second end of the third switch tube B3 is connected to the first end of the fourth switch tube B4. The first end of the first switch tube B1 and the first end of the third switch tube B3 are connected together as the third end of the charging switch circuit 15, the second end of the second switch tube B2 and the second end of the fourth switch tube B4 are connected together as the fourth end of the charging switch circuit 15, the connection node of the first switch tube B1 and the second switch tube B2 is used as the second end of the charging switch circuit 15, and the connection node of the third switch tube B3 and the fourth switch tube B4 is used as the first end of the charging switch circuit 15. The charging switch circuit 15 also includes a third filter capacitor C3, one end of the third filter capacitor C3 is connected to the third end of the charging switch circuit 15, and the other end of the third filter capacitor C3 is connected to the fourth end of the charging switch circuit 15.

[0106] As an example, the transformer circuit 141 further includes a fourth filter capacitor C4 and a fourth power inductor L4. The first end of the charging switch circuit 15 is connected to the fourth output end of the transformer circuit 141 through the fourth power inductor L4, and the second end of the charging switch circuit 15 is connected to the fifth output end of the transformer circuit 141 through the fourth filter capacitor C4.

[0107] In this embodiment, by connecting the first end of the charging switch circuit 15 to the fourth output end of the transformer circuit 141, connecting the second end of the charging switch circuit 15 to the fifth output end of the transformer circuit 141, connecting the third end of the charging switch circuit 15 to the positive electrode of the battery module 11, and connecting the fourth end of the charging switch circuit 15 to the negative electrode of the battery module 11, when the battery module 11 needs to be charged, the charging switch circuit 15 can be controlled to provide a basis for single-phase AC charging and three-phase AC charging of the battery module 11.

[0108] In one embodiment, if Figure 2 As shown, the active discharge system also includes a charging interface module 16; a first end of the charging interface module 16 is connected to the positive electrode of the battery module 11, a second end of the charging interface module 16 is connected to the negative electrode of the battery module 11, and a third end of the charging interface module 16 is connected to the H-bridge arm circuit 13.

[0109] As an example, the first end of the charging interface module 16 is connected to the positive electrode of the battery module 11, the second end of the charging interface module 16 is connected to the negative electrode of the battery module 11, and the third end of the charging interface module 16 is connected to the H-bridge arm circuit 13. In this example, the charging interface module 16 is used to connect an external charging source, which can be an AC power supply or a DC power supply. By connecting the first end of the charging interface module 16 to the positive electrode of the battery module 11, connecting the second end of the charging interface module 16 to the negative electrode of the battery module 11, and connecting the third end of the charging interface module 16 to the H-bridge arm circuit 13, single-phase AC charging and three-phase AC charging of the battery module 11 are achieved.

[0110] In this embodiment, the first end of the charging interface module 16 is connected to the positive electrode of the battery module 11, the second end of the charging interface module 16 is connected to the negative electrode of the battery module 11, and the third end of the charging interface module 16 is connected to the H-bridge arm circuit 13, so that single-phase AC charging and three-phase AC charging of the battery module 11 can be achieved.

[0111] In one embodiment, if Figure 2 As shown, the charging interface module 16 includes a DC charging circuit DC, an AC charging circuit AC, a second switch S5, a third switch S6 and a fourth switch S7; the positive pole of the DC charging circuit DC is connected to the positive pole of the battery module 11 through the second switch S5, and the negative pole of the DC charging circuit DC is connected to the negative pole of the battery module 11 through the third switch S6; the L pole of the AC charging circuit AC is connected to the positive pole of the battery module 11 through the second switch S5, and the N pole of the AC charging circuit AC is connected to the H bridge arm circuit 13 through the fourth switch S7.

[0112] As an example, the positive pole of the DC charging circuit DC is connected to the positive pole of the battery module 11 through the second switch S5, and the negative pole of the DC charging circuit DC is connected to the negative pole of the battery module 11 through the third switch S6; the L pole of the AC charging circuit AC is connected to the positive pole of the battery module 11 through the second switch S5, and the N pole of the AC charging circuit AC is connected to the H bridge arm circuit 13 through the fourth switch S7, wherein the positive pole of the DC charging circuit DC is the first end of the charging interface module 16, the negative pole of the DC charging circuit DC is the second end of the charging interface module 16, and the N pole of the AC charging circuit AC is the third end of the charging interface module 16.

[0113] As an example, a second fuse F2 is further provided between the second switch S5 and the positive electrode of the battery module 11 .

[0114] In this embodiment, by properly controlling the second switch S5 , the third switch S6 and the fourth switch S7 , a DC charging mode or an AC charging mode can be selected to charge the battery module 11 .

[0115] The present embodiment provides a vehicle, including the active discharge system in the above embodiment. The active discharge system includes a bus capacitor, a DCDC module 12, an H-bridge arm circuit 13 and a charging circuit module 14, the DCDC module 12 is connected to the bus capacitor, the H-bridge arm circuit 13 is connected to the DCDC module 12 and the bus capacitor, and the charging circuit module 14 is connected to the H-bridge arm circuit 13. When the bus capacitor is in a discharge condition, the DCDC module 12 can output the energy stored in the bus capacitor in the form of a first discharge current, the H-bridge arm circuit 13 is used to convert the first discharge current into an alternating current, and output a second discharge current, so that the charging circuit module 14 stores the energy corresponding to the second discharge current after receiving the second discharge current output by the H-bridge arm circuit 13, greatly improving the speed of active discharge of the vehicle, using the original bus capacitor, DCDC module 12, H-bridge arm circuit 13 and charging circuit module 14 of the vehicle to realize active discharge of the vehicle, which can reduce the circuit complexity of the active discharge system and reduce the circuit cost.

[0116] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An active discharge system, characterized in that: Including bus capacitor, DCDC module, H bridge arm circuit and charging circuit module; The DCDC module is connected to the bus capacitor and is used to output a first discharge current when the bus capacitor is in a discharge condition; The H-bridge arm circuit is connected to the DCDC module and the bus capacitor, and is used to convert the first discharge current into AC and output a second discharge current; the H-bridge arm circuit includes a first full-bridge circuit in the motor controller, a second full-bridge circuit in the generator controller, and a working condition switching switch; any one of the first single-phase bridge arms in the first full-bridge circuit and any one of the second single-phase bridge arms in the second full-bridge circuit form the H-bridge arm circuit; The charging circuit module is connected to the H-bridge arm circuit and is used to store energy corresponding to the second discharge current; The operating mode switching switch is arranged between the charging connection end of the first full-bridge circuit and the charging circuit module, or between the charging connection end of the second full-bridge circuit and the charging circuit module.

2. The active relief system according to claim 1, characterized in that: The bus capacitor comprises a first bus capacitor and a second bus capacitor; One end of the first bus capacitor is connected to the first end of the DCDC module, and the other end of the first bus capacitor is connected to the second end of the DCDC module; One end of the second bus capacitor is connected to the third end of the DCDC module, and the other end of the second bus capacitor is connected to the fourth end of the DCDC module; The third end and the fourth end of the DCDC module are connected to the H-bridge arm circuit.

3. The active relief system according to claim 2, characterized in that: The first connection end of the first full-bridge circuit is connected to the third end of the DCDC module, the second connection end of the second full-bridge circuit is connected to the fourth end of the DCDC module, and the charging connection end of the first full-bridge circuit is connected to the charging circuit module; The first connection end of the second full-bridge circuit is connected to the third end of the DCDC module, the second connection end of the second full-bridge circuit is connected to the fourth end of the DCDC module, and the charging connection end of the second full-bridge circuit is connected to the charging circuit module.

4. The active relief system according to claim 3, characterized in that: The first full-bridge circuit includes N first single-phase bridge arms, each of the first single-phase bridge arms includes a first upper bridge switch tube and a first lower bridge switch tube connected in series, the first ends of the N first upper bridge switch tubes are connected together to form a first connection end of the first full-bridge circuit, the second ends of the N first lower bridge switch tubes are connected together to form a second connection end of the first full-bridge circuit, and the connection node between the first upper bridge switch tube and the first lower bridge switch tube is a charging connection end of the first full-bridge circuit; The second full-bridge circuit includes N second single-phase bridge arms, each of the second single-phase bridge arms includes a second upper bridge switch tube and a second lower bridge switch tube connected in series, the first ends of the N second upper bridge switch tubes are connected together to form a first connection end of the second full-bridge circuit, the second ends of the N second lower bridge switch tubes are connected together to form a second connection end of the second full-bridge circuit, and the connection node between the first upper bridge switch tube and the second lower bridge switch tube is a charging connection end of the second full-bridge circuit.

5. The active relief system according to claim 4, characterized in that: The active discharge system also includes a control module, which is connected to the operating mode switching switch, the first full-bridge circuit and the second full-bridge circuit, and is used to control the operation of the operating mode switching switch, the switch tube in the first full-bridge circuit and the switch tube in the second full-bridge circuit.

6. The active relief system according to claim 5, characterized in that: The control module is used to control the operating condition switching switch to be turned on when the bus capacitor is in a discharge condition, and to control the first upper bridge switch tube, the first lower bridge switch tube, the second upper bridge switch tube and the second lower bridge switch tube in the H-bridge arm circuit to work to form a discharge loop; when the bus capacitor is not in a discharge condition, the operating condition switching switch is disconnected, and the N first upper bridge switch tubes and the N first lower bridge switch tubes are controlled to work to form a motor control loop, and the N second upper bridge switch tubes and the N second lower bridge switch tubes are controlled to work to form a generator control loop.

7. The active relief system according to claim 1, characterized in that: The charging circuit module includes a transformer circuit and an energy storage battery circuit; The transformer circuit is connected to the H-bridge arm circuit, and is used to receive the second discharge current output by the H-bridge arm circuit, and output a third discharge current; The energy storage battery circuit is connected to the transformer circuit and is used to store energy corresponding to the third discharge current.

8. The active relief system according to claim 7, characterized in that: The energy storage battery circuit includes a first diode, a second diode, a first filter capacitor and an energy storage battery; The anode of the first diode is connected to the first output end of the transformer circuit, and the cathode of the first diode is connected to the positive electrode of the energy storage battery; The anode of the second diode is connected to the second output terminal of the transformer circuit, and the cathode of the second diode is connected to the positive electrode of the energy storage battery; The negative electrode of the energy storage battery is connected to the third output terminal of the transformer circuit; The first end of the first filter capacitor is connected to the positive electrode of the energy storage battery, and the second end of the first filter capacitor is connected to the negative electrode of the energy storage battery.

9. The active relief system according to claim 8, characterized in that: The active discharge system further includes a battery module, wherein the battery module is connected to a first end and a second end of the DCDC module; The charging circuit module also includes a charging switch circuit, a first end of the charging switch circuit is connected to the fourth output end of the transformer circuit, a second end of the charging switch circuit is connected to the fifth output end of the transformer circuit, a third end of the charging switch circuit is connected to the positive pole of the battery module, and a fourth end of the charging switch circuit is connected to the negative pole of the battery module.

10. The active relief system according to claim 9, characterized in that: The charging switch circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The first switch tube and the second switch tube are connected in series, and a connection node between the first switch tube and the second switch tube forms a first end of the charging switch circuit; The third switch tube is connected to the fourth switch tube, and a connection node between the third switch tube and the fourth switch tube forms a second end of the charging switch circuit; The first end of the first switch tube and the first end of the third switch tube are connected together to form a third end of the charging switch circuit; The second end of the second switch tube and the second end of the fourth switch tube are connected together to form a fourth end of the charging switch circuit.

11. The active relief system according to claim 9, characterized in that: The active discharge system also includes a charging interface module; a first end of the charging interface module is connected to the positive electrode of the battery module, a second end of the charging interface module is connected to the negative electrode of the battery module, and a third end of the charging interface module is connected to the H-bridge arm circuit.

12. The active relief system according to claim 11, characterized in that: The charging interface module includes a DC charging circuit, an AC charging circuit, a second switch, a third switch and a fourth switch; The positive electrode of the DC charging circuit is connected to the positive electrode of the battery module through the second switch, and the negative electrode of the DC charging circuit is connected to the negative electrode of the battery module through the third switch; The L pole of the AC charging circuit is connected to the positive pole of the battery module through the second switch, and the N pole of the AC charging circuit is connected to the H bridge arm circuit through the fourth switch; The positive pole of the DC charging circuit is the first end of the charging interface module, the negative pole of the DC charging circuit is the second end of the charging interface module, and the N pole of the AC charging circuit is the third end of the charging interface module.

13. A car, characterized in that: An active discharge system comprising any one of claims 1 to 12.

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