High-power bidirectional DC conversion circuit and device

Abstract

The utility model relates to a high-power bidirectional direct-current conversion circuit, which is characterized in that each SiC switch module is matched with each direct-current contactor to construct a high-efficiency conversion circuit structure between low voltage and high voltage, and an inductor and a capacitor are applied to a low-voltage side to construct a filter circuit so as to reduce current ripples and improve the quality of electric energy; the capacitor is arranged on the high-voltage side, in the working process of the converter, the capacitor absorbs or releases electric energy, voltage fluctuation caused by switching action is reduced, output voltage is more stable, the situation of high-voltage side sudden change or input voltage fluctuation is effectively coped with, and the dynamic response efficiency of a system is improved; in addition, a feedback module and a fault detection module are introduced, a device based on a high-power bidirectional DC conversion circuit is established, and the output of the conversion circuit is accurately adjusted by a control module according to monitoring, so that the output can be kept stable even under the condition of input voltage fluctuation or load change, and the actual working efficiency, the reliability and the safety are improved.

Description

Technical Field

[0001] The utility model relates to a high-power bidirectional direct current conversion circuit and a device thereof, belonging to the technical field of power electronics. Background Art

[0002] With the intensification of the energy crisis and rising environmental awareness, mechanical potential energy recovery technology has received widespread attention. This technology collects and converts the potential energy generated by mechanical equipment (such as elevators and large cranes) during operation, storing it as electrical energy for use by the special equipment itself. However, currently widely used silicon (Si)-based power electronic devices (such as IGBTs) have many limitations in DC converters, including low voltage ratios, low efficiency, large size, and complex thermal management. These limitations restrict the efficiency and application scope of energy recovery. In addition, existing DC converters cannot effectively address the problem of receiving and controlling fault feedback signals from the operating special equipment. In addition, for low-voltage supercapacitors (voltage levels below 96V modules) without a supercapacitor management system (CMS), it is difficult to accurately monitor the supercapacitor's voltage and temperature, making it impossible to timely adjust the DC converter's charge and discharge status, affecting system stability and safety. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a high-power bidirectional DC conversion circuit, which has the application characteristics of wide voltage ratio range, high-efficiency conversion, and high temperature resistance.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: The utility model designs a high-power bidirectional DC conversion circuit, including a DC contactor KM1, a DC contactor KM2, a DC contactor KM3, a SiC switch module SiC1, a SiC switch module SiC2, a SiC switch module SiC3, and a SiC switch module SiC4, wherein the negative electrode of the SiC switch module SiC3 is connected to the positive electrode of the SiC switch module SiC1 to form a first connection position, and the negative electrode of the SiC switch module SiC4 is connected to the positive electrode of the SiC switch module SiC2. The poles are connected to each other to form a second connection position, the first connection position is connected to the second connection position, and then connected in series with the DC contactor KM1 to form a low-voltage side positive terminal; the negative pole of the SiC switch module SiC1 is connected to the negative pole of the SiC switch module SiC2, and the phase connection position is connected in series with the DC contactor KM2 to form a high-voltage side positive terminal; the positive pole of the SiC switch module SiC3 is connected to the positive pole of the SiC switch module SiC4, and one side of the phase connection position forms the low-voltage side negative terminal, and the other side of the phase connection position is connected in series with the DC contactor KM3 to form the high-voltage side negative terminal;

[0005] The control ends of the DC contactor KM1, the DC contactor KM2, the DC contactor KM3, the SiC switch module SiC1, the SiC switch module SiC2, the SiC switch module SiC3, and the SiC switch module SiC4 are respectively connected to external control signals to achieve a boost operation for transmitting electric energy from the low-voltage side to the high-voltage side, or a step-down operation for transmitting electric energy from the high-voltage side to the low-voltage side.

[0006] As a preferred technical solution of the present invention: it also includes an inductor L1, an inductor L2, and at least two capacitors C1, wherein the capacitors C1 are connected in parallel with each other, and one end of the parallel structure, one end of the inductor L1, and one end of the inductor L2 are connected, and the connection position is connected in series with the DC contactor KM1 to form a low-voltage side positive terminal; the other end of the inductor L1 is connected to the first connection position between the SiC switch module SiC1 and the SiC switch module SiC3, and the other end of the inductor L2 is connected to the second connection position between the SiC switch module SiC2 and the SiC switch module SiC4; one side of the connection position between the positive electrode of the SiC switch module SiC3 and the positive electrode of the SiC switch module SiC4 is connected to the other end of the parallel structure of the capacitors C1 to form a low-voltage side negative terminal.

[0007] As a preferred technical solution of the present invention: it also includes at least two capacitors C2, each capacitor C2 is connected in parallel with each other, one end of the parallel structure is connected to the connection position of the negative electrode of the SiC switch module SiC1 and the negative electrode of the SiC switch module SiC2, and the docking position is connected in series with the DC contactor KM2 to form the high-voltage side positive terminal; the other side of the connection position of the positive electrode of the SiC switch module SiC3 and the positive electrode of the SiC switch module SiC4 is connected to the other end of the parallel structure of each capacitor C2, and the docking position is connected in series with the DC contactor KM3 to form the high-voltage side negative terminal.

[0008] As an optimal technical solution of the present utility model: it also includes a DC circuit breaker T1, a DC contactor KM4, a DC contactor KM5, a resistor R1, and a resistor R2. The positive end of the low-voltage side is connected in series with the DC circuit breaker T1 and then connected in series with the DC contactor KM1. The DC contactor KM4 is connected in series with the resistor R1, and the series structure is connected in parallel to the two ends of the DC contactor KM1; the DC contactor KM5 is connected in series with the resistor R2, and the series structure is connected in parallel to the two ends of the DC contactor KM2.

[0009] As a preferred technical solution of the present invention: the structures of the SiC switch module SiC1, the SiC switch module SiC2, the SiC switch module SiC3, and the SiC switch module SiC4 are the same. Each structure includes a diode and a SiC-based MOS transistor. In each structure, the drain of the MOS transistor is connected to the cathode of the diode to form the cathode of the SiC switch module, and the source of the MOS transistor is connected to the anode of the diode to form the anode of the SiC switch module.

[0010] Corresponding to the above, the technical problem to be solved by the present invention is to provide a device based on a high-power bidirectional DC conversion circuit, which has the advantages of a wide voltage ratio range, high conversion efficiency, small device size, high power density, and good thermal stability.

[0011] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: the present invention designs a device based on a high-power bidirectional DC conversion circuit, which is based on the high-power bidirectional DC conversion circuit and also includes a control module, a feedback module, and a power supply circuit, a power taking circuit or a power taking circuit and a power supply circuit respectively connected to the low-voltage side and the high-voltage side of the high-power bidirectional DC conversion circuit in sequence; the output end of the feedback module is connected to the input end of the control module, and the input end of the feedback module is connected to the output side of the high-power bidirectional DC conversion circuit under operation, and the feedback module collects the voltage information and current information of the output side and uploads it to the control module; the output end of the control module is respectively connected to the control end of the DC contactor KM1, the control end of the DC contactor KM2, the control end of the DC contactor KM3, the control end of the SiC switch module SiC1, the control end of the SiC switch module SiC2, the control end of the SiC switch module SiC3, and the control end of the SiC switch module SiC4; the control module performs output control on each connected control end based on the voltage information and current information uploaded by the feedback module.

[0012] As an optimal technical solution of the present invention: it also includes a fault detection module, based on the power-taking circuit being a power storage circuit, the power storage circuit at the input end of the fault detection module is used to collect the fault signal of the power storage circuit, the output end of the fault detection module is connected to the input end of the control module, and the fault detection module uploads the fault signal to the control module; the control module performs output control on each connected control end based on the fault signal uploaded by the fault detection module.

[0013] As a preferred technical solution of the present invention, it further includes a data communication module that integrates various preset communication interfaces, and the data communication module is connected to the control module.

[0014] As an optimal technical solution of the utility model: it also includes a heat dissipation module, which is connected to the high-power bidirectional DC conversion circuit, the power storage circuit, and the power supply circuit. The heat dissipation module is used to dissipate heat from the circuits connected thereto.

[0015] The high-power bidirectional DC conversion circuit and device described in the utility model adopt the above technical solution and have the following technical effects compared with the existing technology:

[0016] The utility model designs a high-power bidirectional DC conversion circuit, which uses various SiC switch modules and cooperates with various DC contactors to construct an efficient conversion circuit structure between low voltage and high voltage, and uses inductors and capacitors on the low-voltage side to construct a filter circuit to reduce current ripple and improve power quality. Capacitors are set on the high-voltage side. During the operation of the converter, the capacitors absorb or release electric energy, reducing voltage fluctuations caused by switching actions, making the output voltage more stable, effectively responding to sudden changes on the high-voltage side or input voltage fluctuations, and improving the dynamic response efficiency of the system. In addition, a feedback module and a fault detection module are introduced to build a device based on the high-power bidirectional DC conversion circuit. The control module accurately adjusts the output of the conversion circuit based on monitoring to ensure that the output remains stable even when the input voltage fluctuates or the load changes, thereby improving actual work efficiency, reliability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a high-power bidirectional DC conversion circuit designed by the utility model. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Silicon carbide (SiC) power devices have significant advantages in voltage resistance, on-resistance and operating frequency. These characteristics enable SiC power devices to perform excellently in high-temperature, high-frequency and high-efficiency application environments, and are particularly suitable for mechanical potential energy recovery applications.

[0020] Based on the above, the utility model designs a high-power bidirectional DC conversion circuit. In practical applications, such as Figure 1As shown, the specific design includes a DC contactor KM1, a DC contactor KM2, a DC contactor KM3, a SiC switch module SiC1, a SiC switch module SiC2, a SiC switch module SiC3, and a SiC switch module SiC4, wherein the negative electrode of the SiC switch module SiC3 is connected to the positive electrode of the SiC switch module SiC1 to form a first connection position, the negative electrode of the SiC switch module SiC4 is connected to the positive electrode of the SiC switch module SiC2 to form a second connection position, the first connection position is connected to the second connection position, and then connected in series with the DC contactor KM1 to form a low-voltage side positive terminal; the negative electrode of the SiC switch module SiC1 is connected to the negative electrode of the SiC switch module SiC2, and this phase connection position is connected in series with the DC contactor KM2 to form a high-voltage side positive terminal; the positive electrode of the SiC switch module SiC3 is connected to the positive electrode of the SiC switch module SiC4, and one side of this phase connection position forms a low-voltage side negative terminal, and the other side of this phase connection position is connected in series with the DC contactor KM3 to form a high-voltage side negative terminal.

[0021] Among them, the switch module constructed with SiC can achieve high-efficiency power conversion in design. In application, it has high switching frequency, low on-resistance and good high temperature resistance. Figure 1 As shown, the structures of the SiC switch modules SiC1, SiC switch modules SiC2, SiC switch modules SiC3, and SiC switch modules SiC4 are the same. In specific applications, each structure is designed to include a diode and a SiC-based MOS transistor. In each structure, the drain of the MOS transistor is connected to the cathode of the diode to form the cathode of the SiC switch module, and the source of the MOS transistor is connected to the anode of the diode to form the anode of the SiC switch module.

[0022] The control ends of the DC contactor KM1, the DC contactor KM2, the DC contactor KM3, the SiC switch module SiC1, the SiC switch module SiC2, the SiC switch module SiC3, and the SiC switch module SiC4 are respectively connected to external control signals to achieve a boost operation for transmitting electric energy from the low-voltage side to the high-voltage side, or a step-down operation for transmitting electric energy from the high-voltage side to the low-voltage side.

[0023] Based on the above basic scheme for designing a high-power bidirectional DC conversion circuit, in actual application, further design is performed on the input side and the output side by adding inductor L1, inductor L2, and at least two capacitors C1 and at least two capacitors C2. In application, Figure 1As shown, on the low-voltage side, the capacitors C1 are connected in parallel, and one end of the parallel structure, one end of the inductor L1, and one end of the inductor L2 are connected. The connection position is connected in series with the DC contactor KM1 to form the positive terminal of the low-voltage side. The other end of the inductor L1 is connected to the first connection position between the SiC switch module SiC1 and the SiC switch module SiC3, and the other end of the inductor L2 is connected to the second connection position between the SiC switch module SiC2 and the SiC switch module SiC4. One side of the connection position between the positive electrode of the SiC switch module SiC3 and the positive electrode of the SiC switch module SiC4 is connected to the other end of the parallel structure of the capacitors C1 to form the negative terminal of the low-voltage side. Here, the design of the capacitors C1, inductors L1, and inductors L2 achieves the effect of a filtering circuit, that is, reducing current ripple and improving power quality in application.

[0024] For the high-voltage side, Figure 1 As shown, the capacitors C2 are connected in parallel with each other, and one end of the parallel structure is connected to the connection position of the negative electrode of the SiC switch module SiC1 and the negative electrode of the SiC switch module SiC2. This connection position is connected in series with the DC contactor KM2 to form the positive terminal on the high-voltage side; the other side of the connection position of the positive electrode of the SiC switch module SiC3 and the positive electrode of the SiC switch module SiC4 is connected to the other end of the parallel structure of the capacitors C2. This connection position is connected in series with the DC contactor KM3 to form the negative terminal on the high-voltage side. With the addition of the capacitors C2 on the high-voltage side in this design, during the operation of the converter, the capacitors can absorb or release electrical energy, reduce voltage fluctuations caused by switching actions, make the output voltage more stable, and improve the dynamic response of the system.

[0025] In actual application, the above-mentioned high-power bidirectional DC conversion circuit is designed. In addition to the external control of each SiC switch module and DC contactors KM1, KM2, and KM3, a DC circuit breaker T1, a DC contactor KM4, a DC contactor KM5, a resistor R1, and a resistor R2 are further added. The positive terminal of the low-voltage side is connected in series with the DC circuit breaker T1 and then connected to the series DC contactor KM1. The DC contactor KM4 is connected in series with the resistor R1, and the series structure is connected in parallel to both ends of the DC contactor KM1; the DC contactor KM5 is connected in series with the resistor R2, and the series structure is connected in parallel to both ends of the DC contactor KM2. Among them, the DC contactors KM4 and KM5 are respectively connected to external control signals to operate.

[0026] In the above-mentioned high-power bidirectional DC conversion circuit, the addition of each capacitor can also serve as part of the overvoltage protection, reducing the potential damage to subsequent electronic equipment caused by sudden voltage spikes, thereby improving the overall reliability of the system. In addition, the capacitor can be used as a filtering element to filter out the high-frequency ripple components in the output voltage during the storage and release of electrical energy, thereby achieving output voltage stability and improving the efficiency of the designed converter.

[0027] During the charging and discharging processes of the converter designed above, the capacitor can store energy and release it when needed. Especially when operating in Boost (step-up) or Buck (step-down) mode, the combination of capacitors and inductors can achieve effective energy conversion. Moreover, in applications where the power supply circuit is composed of a storage circuit, when discharging, when the output voltage approaches the operating voltage of the storage circuit, the bidirectional DC-DC converter can achieve better energy management by adjusting the capacitor.

[0028] In addition, a device based on a high-power bidirectional DC conversion circuit is further designed. Based on the high-power bidirectional DC conversion circuit, the further design also includes a control module, a feedback module, and a power supply circuit, a power taking circuit, or a power taking circuit and a power supply circuit that are connected to the low-voltage side and the high-voltage side of the high-power bidirectional DC conversion circuit respectively; the output end of the feedback module is connected to the input end of the control module, and the input end of the feedback module is connected to the output side of the high-power bidirectional DC conversion circuit under operation. The feedback module collects the voltage information and current information of the output side and uploads it to the control module; the output end of the control module is respectively connected to the control end of the DC contactor KM1, the control end of the DC contactor KM2, the control end of the DC contactor KM3, the control end of the SiC switch module SiC1, the control end of the SiC switch module SiC2, the control end of the SiC switch module SiC3, and the control end of the SiC switch module SiC4; the control module performs output control on each connected control end based on the voltage information and current information uploaded by the feedback module.

[0029] In applications, the control module is the brain of the entire device, responsible for generating control signals to control the on and off of each SiC switch module, thereby regulating the output voltage and current. It ensures that the converter can operate stably in either boost or buck mode and automatically adjusts its operating state according to load changes to maintain output stability. The feedback module collects voltage and current information from the output side of the converter circuit and sends it back to the control module to achieve closed-loop control. This allows the control module to precisely adjust its output, ensuring stable output even with input voltage fluctuations or load changes.

[0030] Regarding the above-mentioned device design based on the high-power bidirectional DC conversion circuit, in actual application, a fault detection module, a data communication module, and a heat dissipation module are further added. Based on the power-taking circuit being a power storage circuit, the power storage circuit at the input end of the fault detection module is used to collect the fault signal of the power storage circuit. The output end of the fault detection module is connected to the input end of the control module, and the fault detection module uploads the fault signal to the control module; the control module performs output control on each connected control end based on the fault signal uploaded by the fault detection module. In application, the fault detection module monitors the operating status of the power storage circuit composed of the supercapacitor module in real time. Once an abnormal situation such as overcurrent, overvoltage, undervoltage or overheating is detected, an alarm will be immediately issued or protective measures will be taken to prevent equipment damage, and the charging and discharging of the supercapacitor module will be effectively controlled to ensure safe and efficient operation of the device.

[0031] The data communication module integrates various preset communication interfaces including RS485 interface. The data communication module is connected to the control module, that is, the data communication interface is integrated into the designed converter, which can reduce the need for external connection, simplify the system structure, be less susceptible to the influence of the external environment, and improve the integration and compactness of the system. The internally integrated interface can provide faster and more convenient data exchange, reduce data transmission delay, and ensure real-time monitoring and control; the heat dissipation module is connected to the high-power bidirectional DC conversion circuit, as well as the power storage circuit and the power supply circuit. Since the power device generates heat during operation, the function of the heat dissipation module is to effectively dissipate the heat to ensure that the device can operate within a safe temperature range, which is very critical to improving the life and stability of the equipment.

[0032] The above-mentioned device design based on the high-power bidirectional DC conversion circuit adopts an integrated design as described above, which reduces the use of external components, can reduce system costs, and simplify the installation and maintenance process. The integrated interface allows more precise control and adjustment, which helps to optimize the performance of the entire system, especially in application scenarios that require precise control of the output power.

[0033] In practical application, when the above design is applied, when electric energy flows from the low-voltage side to the high-voltage side, the MOS transistors in the SiC switch module SiC1 and the SiC switch module SiC2 are working, while the MOS transistors in the SiC switch module SiC3 and the SiC switch module SiC4 are not working. Current flows from inductor L1 to the diode in the SiC switch module SiC1, and at the same time, current flows from inductor L2 to the diode in the SiC switch module SiC2. The high-voltage side V2 serves as a power storage circuit, and the designed converter is a boost converter. When electric energy flows from the high-voltage side to the low-voltage side, if the MOS transistors in SiC switch module SiC3 and SiC switch module SiC4 do not operate, current flows from the MOS transistor in SiC switch module SiC2 to inductor L2, and simultaneously current flows from the MOS transistor in SiC switch module SiC1 to inductor L1. If the MOS transistors in SiC switch module SiC1 and SiC switch module SiC2 do not operate, current flows from the diode in SiC switch module SiC4 to inductor L2, and simultaneously current flows from the diode in SiC switch module SiC3 to inductor L1. The low-voltage side serves as a storage circuit, and the designed converter is a buck converter.

[0034] The above technical solution designs a high-power bidirectional DC conversion circuit, which uses various SiC switch modules and DC contactors to construct an efficient conversion circuit structure between low voltage and high voltage, and uses inductors and capacitors on the low-voltage side to construct a filter circuit to reduce current ripple and improve power quality. Capacitors are set on the high-voltage side. During the operation of the converter, the capacitors absorb or release electrical energy, reducing voltage fluctuations caused by switching actions, making the output voltage more stable, effectively responding to sudden changes on the high-voltage side or input voltage fluctuations, and improving the dynamic response efficiency of the system. In addition, a feedback module and a fault detection module are introduced to build a device based on the high-power bidirectional DC conversion circuit. The control module monitors and accurately adjusts the output of the conversion circuit to ensure that the output remains stable even when the input voltage fluctuates or the load changes, thereby improving actual work efficiency, reliability, and safety.

[0035] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A high-power bidirectional DC conversion circuit, characterized in that: The invention comprises a DC contactor (KM1), a DC contactor (KM2), a DC contactor (KM3), a SiC switch module (SiC1), a SiC switch module (SiC2), a SiC switch module (SiC3), and a SiC switch module (SiC4), wherein the negative electrode of the SiC switch module (SiC3) and the positive electrode of the SiC switch module (SiC1) are connected to each other to form a first connection position, the negative electrode of the SiC switch module (SiC4) and the positive electrode of the SiC switch module (SiC2) are connected to each other to form a second connection position, and the first connection position is The positive terminal of the SiC switch module (SiC1) is connected to the negative terminal of the SiC switch module (SiC2), and the positive terminal of the high-voltage side is formed after the phase connection position is connected in series with the DC contactor (KM2); the positive terminal of the SiC switch module (SiC3) is connected to the positive terminal of the SiC switch module (SiC4), and one side of the phase connection position forms the negative terminal of the low-voltage side, and the other side of the phase connection position is connected in series with the DC contactor (KM3) to form the negative terminal of the high-voltage side; The control ends of the DC contactor (KM1), the DC contactor (KM2), the DC contactor (KM3), the SiC switch module (SiC1), the SiC switch module (SiC2), the SiC switch module (SiC3), and the SiC switch module (SiC4) are respectively connected to external control signals to achieve a boost operation for transmitting electric energy from the low-voltage side to the high-voltage side, or a step-down operation for transmitting electric energy from the high-voltage side to the low-voltage side.

2. The high-power bidirectional DC conversion circuit according to claim 1, characterized in that: The invention also includes an inductor (L1), an inductor (L2), and at least two capacitors (C1), wherein the capacitors (C1) are connected in parallel with each other, and one end of the parallel structure, one end of the inductor (L1), and one end of the inductor (L2) are connected, and the connection position is connected in series with the DC contactor (KM1) to form a low-voltage side positive terminal; the other end of the inductor (L1) is connected to the first connection position between the SiC switch module (SiC1) and the SiC switch module (SiC3), and the other end of the inductor (L2) is connected to the second connection position between the SiC switch module (SiC2) and the SiC switch module (SiC4); one side of the connection position between the positive electrode of the SiC switch module (SiC3) and the positive electrode of the SiC switch module (SiC4) is connected to the other end of the parallel structure of the capacitors (C1), forming a low-voltage side negative terminal.

3. A high-power bidirectional DC conversion circuit according to claim 1 or 2, characterized in that: The device further comprises at least two capacitors (C2), each capacitor (C2) being connected in parallel with one another, wherein one end of the parallel structure is connected to the connection position of the negative electrode of the SiC switch module (SiC1) and the negative electrode of the SiC switch module (SiC2), and the connection position is connected in series with a DC contactor (KM2) to form a high-voltage side positive terminal; and the other end of the connection position of the positive electrode of the SiC switch module (SiC3) and the positive electrode of the SiC switch module (SiC4) is connected to the other end of the parallel structure of each capacitor (C2), and the connection position is connected in series with a DC contactor (KM3) to form a high-voltage side negative terminal.

4. The high-power bidirectional DC conversion circuit according to claim 1, characterized in that: The invention also includes a DC circuit breaker (T1), a DC contactor (KM4), a DC contactor (KM5), a resistor (R1), and a resistor (R2). The positive terminal on the low-voltage side is connected in series with the DC circuit breaker (T1) and then connected in series with the DC contactor (KM1). The DC contactor (KM4) is connected in series with the resistor (R1) and is connected in parallel to both ends of the DC contactor (KM1). The DC contactor (KM5) is connected in series with the resistor (R2) and is connected in parallel to both ends of the DC contactor (KM2).

5. The high-power bidirectional DC conversion circuit according to claim 1, characterized in that: The structures of the SiC switch module (SiC1), SiC switch module (SiC2), SiC switch module (SiC3), and SiC switch module (SiC4) are the same. Each structure includes a diode and a SiC-based MOS transistor. In each structure, the drain of the MOS transistor is connected to the cathode of the diode, forming the cathode of the SiC switch module, and the source of the MOS transistor is connected to the anode of the diode, forming the anode of the SiC switch module.

6. A device based on a high-power bidirectional DC conversion circuit according to any one of claims 1 to 5, characterized in that: Based on a high-power bidirectional DC conversion circuit, it also includes a control module, a feedback module, and a power supply circuit, a power taking circuit, or a power taking circuit and a power supply circuit that are connected to the low-voltage side and the high-voltage side of the high-power bidirectional DC conversion circuit in sequence; the output end of the feedback module is connected to the input end of the control module, and the input end of the feedback module is connected to the output side of the high-power bidirectional DC conversion circuit when it is working. The feedback module collects voltage information and current information on the output side and uploads them to the control module; the output end of the control module is respectively connected to the control end of the DC contactor (KM1), the control end of the DC contactor (KM2), the control end of the DC contactor (KM3), the control end of the SiC switch module (SiC1), the control end of the SiC switch module (SiC2), the control end of the SiC switch module (SiC3), and the control end of the SiC switch module (SiC4); the control module performs output control on each connected control end based on the voltage information and current information uploaded by the feedback module.

7. The device of a high-power bidirectional DC conversion circuit according to claim 6, characterized in that: It also includes a fault detection module. Based on the power-taking circuit being a power storage circuit, the input end of the fault detection module is connected to the power storage circuit to collect the fault signal of the power storage circuit. The output end of the fault detection module is connected to the input end of the control module, and the fault detection module uploads the fault signal to the control module; the control module performs output control on each connected control end based on the fault signal uploaded by the fault detection module.

8. The device of a high-power bidirectional DC conversion circuit according to claim 6, characterized in that: It also includes a data communication module that integrates various preset communication interfaces, and the data communication module is connected to the control module.

9. The device of a high-power bidirectional DC conversion circuit according to claim 6, characterized in that: It also includes a heat dissipation module, which is connected to the high-power bidirectional DC conversion circuit, the power storage circuit, and the power supply circuit. The heat dissipation module is used to dissipate heat from the circuits connected to it.

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