IGBT drive circuit, PCB and vehicle-mounted bidirectional power supply

Abstract

The utility model discloses an IGBT (Insulated Gate Bipolar Translator) driving circuit, a PCB (Printed Circuit Board) and a vehicle-mounted bidirectional power supply. The driving circuit comprises a plurality of optocoupler driving units, a plurality of half-bridge driving units and a plurality of voltage reduction units, the input end of the half-bridge driving unit is used for connecting an external power supply device, and the output end of the half-bridge driving unit is connected with the input end of the voltage reduction unit; the output end of the voltage reduction unit is connected with the power supply end of the optocoupler driving unit and an insulated gate bipolar transistor of the vehicle-mounted bidirectional power supply; the input end of the optocoupler driving unit is connected with a digital signal processor of the vehicle-mounted bidirectional power supply, the output end of the optocoupler driving unit is connected with insulated gate bipolar transistors of the vehicle-mounted bidirectional power supply, and the number of the IGBT driving circuits is consistent with the number of the insulated gate bipolar transistors and the IGBT driving circuits are in one-to-one correspondence with the insulated gate bipolar transistors; according to the driving circuit disclosed by the invention, the optocoupler driving units are connected with the gate bipolar transistors in a one-to-one correspondence manner, so that accurate driving and control of the insulated gate bipolar transistors are realized, and the reliability and the stability of the driving circuit are improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit design technology, and in particular to an IGBT drive circuit, PCB board and vehicle bidirectional power supply. Background Technology

[0002] In modern mining transportation systems, mining trucks are key transportation tools, and optimizing their energy efficiency is crucial for cost control and environmental protection in the entire mining operation. To improve the energy efficiency of mining trucks, they can be used as energy converters when attached to the wire mesh to charge the batteries. Specifically, when a mining truck needs to decelerate or stop during operation, its braking system is activated. Traditional braking methods mainly rely on mechanical friction to convert kinetic energy into heat energy. This process is not only inefficient but also causes significant wear and tear on the braking system components. Mining trucks using energy recovery braking systems are different. They convert the kinetic energy of the wheels into electrical energy through the inverter function of the motor. In this process, the motor operates as a generator, converting kinetic energy into electrical energy, and then using the onboard power management system to recharge the batteries.

[0003] IGBTs play a crucial role in energy recovery braking systems. When mining trucks use energy recovery braking, IGBTs can efficiently regulate current and voltage to ensure that the kinetic energy of the wheels is successfully converted into electrical energy. At the same time, IGBTs also participate in the energy recovery process, and through precise control, the recovered electrical energy is safely and stably delivered to the battery, realizing the reuse of energy.

[0004] The existing IGBT drive circuits in vehicle power management systems are not sufficiently well-isolated. Insufficient electrical isolation can lead to signal interference between the control and power terminals. This interference may originate from electromagnetic interference, common-mode voltage, grounding loops, and other issues. When these interferences occur, they are superimposed on the control signal as noise, thus affecting the normal switching operation of the IGBT. This effect may cause performance degradation in the power management system, such as reduced efficiency, slower response time, and in extreme cases, may even cause circuit failure or malfunction.

[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an IGBT driving circuit, which connects the optocoupler driving unit to the gate bipolar transistor in a one-to-one correspondence, thereby realizing the precise driving and control of the insulated gate bipolar transistor and improving the reliability and stability of the driving circuit.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An IGBT driving circuit includes several optocoupler driving units, several half-bridge driving units, and several buck units. The input terminal of each half-bridge driving unit is connected to an external power supply device, and the output terminal of each half-bridge driving unit is connected to the input terminal of each buck unit. The output terminal of each buck unit is connected to the power supply terminal of the optocoupler driving unit and is used to connect to an insulated-gate bipolar transistor (IGBT) of an on-board bidirectional power supply. The input terminal of each optocoupler driving unit is connected to a digital signal processor of the on-board bidirectional power supply, and the output terminal of each optocoupler driving unit is connected to an IBT of the on-board bidirectional power supply. The number of optocoupler driving units, the number of half-bridge driving units, and the number of buck units correspond one-to-one with the number of IBTs in the on-board bidirectional power supply.

[0009] In the IGBT driving circuit, the optocoupler driving unit includes an optocoupler U13. Pins A and K of the optocoupler U13 are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply. Pins VCC and VEE of the optocoupler U13 are respectively connected to the output terminal of the buck unit. Pin Vout of the optocoupler U13 is used to connect to the insulated gate bipolar transistor of the vehicle bidirectional power supply.

[0010] In the IGBT driving circuit, the optocoupler driving unit further includes a current limiting section and a conduction control section. The output terminal of the current limiting section is connected to pin A of the optocoupler U13, and the output terminal of the conduction control section is connected to pin K of the optocoupler U13. The input terminals of the current limiting section and the conduction control section are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply.

[0011] In the IGBT driving circuit, the optocoupler driving unit further includes an electrostatic protection section and a first indicator section. The pin Vout of the optocoupler U13 is connected to the insulated gate bipolar transistor of the vehicle bidirectional power supply through the electrostatic protection section and the first indicator section.

[0012] In the IGBT driving circuit, the half-bridge driving unit includes a first half-bridge driving section and a second half-bridge driving section. The input terminals of the first half-bridge driving section and the second half-bridge driving section are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply. The power supply terminals of the first half-bridge driving section and the second half-bridge driving section are respectively used to connect to an external power supply device. The output terminals of the first half-bridge driving section and the second half-bridge driving section are respectively connected to the input terminal of the buck unit.

[0013] In the IGBT driving circuit, the circuit structure of the first half-bridge driving section is the same as that of the second half-bridge driving section. The first half-bridge driving section includes a voltage divider group, a half-bridge driving chip U38, a first filter group, and a square wave generating group. The input terminal of the voltage divider group is used to connect to the digital signal processor of the vehicle bidirectional power supply. The output terminal of the voltage divider group is connected to the HIN and LIN pins of the half-bridge driving chip U38, and is connected to the VCC pin of the half-bridge driving chip U38 through the first filter group. The HO and LO pins of the half-bridge driving chip U38 are respectively connected to the input terminal of the square wave generating group, and the output terminal of the square wave generating group is connected to the input terminal of the buck unit.

[0014] In the IGBT driving circuit, the step-down unit includes a transformer T1, an upper arm driving section, and a lower arm driving section. The primary side of the transformer T1 is connected to the output terminal of the half-bridge driving unit, the secondary side of the transformer T1 is connected to the input terminal of the upper arm driving section, and the tertiary side of the transformer T1 is connected to the input terminal of the lower arm driving section. The output terminals of the upper arm driving section and the lower arm driving section are respectively connected to the power supply terminal of the optocoupler driving unit and are used to connect the upper arm and lower arm of the insulated gate bipolar transistor, respectively.

[0015] In the IGBT driving circuit described above, the structure of the upper arm driving unit is the same as that of the lower arm driving unit; the upper arm driving unit includes a rectifier group, a second filter group, and an indicator group. One end of the rectifier group is connected to the secondary side of the transformer T1, and the other end of the rectifier group and the second filter group are respectively connected to the power supply terminal of the optocoupler driving unit and are used to connect to the upper arm of the insulated gate bipolar transistor; the indicator group is connected to the second filter group.

[0016] This utility model also provides a PCB board, on which the IGBT driving circuit as described above is printed.

[0017] This utility model also provides a vehicle-mounted bidirectional power supply, which uses the IGBT drive circuit described above to realize the operation control of the insulated gate bipolar transistor.

[0018] Beneficial effects:

[0019] This invention provides an IGBT drive circuit that significantly simplifies the circuit structure, reduces the risk of failures caused by complex circuits, and thus significantly improves system reliability and stability. Furthermore, the circuit design can flexibly adapt to different numbers of insulated gate bipolar transistors, effectively responding to changes in on-board bidirectional power supply requirements, demonstrating its high adaptability. In addition, the application of the optocoupler drive unit ensures efficient and stable signal transmission, equipping the on-board bidirectional power supply system with an efficient control mechanism, enabling it to maintain efficient, stable, and reliable operation under various working conditions. Attached Figure Description

[0020] Figure 1 The circuit schematic diagram of the IGBT drive circuit provided by this utility model;

[0021] Figure 2 Circuit structure diagram of the optocoupler driving unit provided by this utility model;

[0022] Figure 3 The circuit structure diagram of the half-bridge drive unit provided by this utility model;

[0023] Figure 4 The circuit structure diagram of the step-down unit provided by this utility model.

[0024] Explanation of key component symbols: 1-Optical coupler drive unit, 2-Half-bridge drive unit, 3-Buck converter unit, 4-Insulated gate bipolar transistor, 5-Digital signal processor. Detailed Implementation

[0025] This utility model provides an IGBT drive circuit, a PCB board, and a vehicle bidirectional power supply. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments.

[0026] In the description of this utility model, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Please see Figures 1 to 4This utility model provides an IGBT driving circuit, including several optocoupler driving units 1, several half-bridge driving units 2, and several buck units 3; the input terminal of the half-bridge driving unit 2 is used to connect to an external power supply device, and the output terminal of the half-bridge driving unit 2 is connected to the input terminal of the buck unit 3; the output terminal of the buck unit 3 is connected to the power supply terminal of the optocoupler driving unit 1 and is used to connect to the insulated gate bipolar transistor 4 of the vehicle bidirectional power supply; the input terminal of the optocoupler driving unit 1 is used to connect to the digital signal processor 5 of the vehicle bidirectional power supply, and the output terminal of the optocoupler driving unit 1 is used to connect to the insulated gate bipolar transistor 4 of the vehicle bidirectional power supply. The number of optocoupler driving units 1, the number of half-bridge driving units 2, and the number of buck units 3 are consistent with and correspond one-to-one with the number of insulated gate bipolar transistors 4 of the vehicle bidirectional power supply.

[0028] The IGBT driving circuit disclosed in this application integrates several optocoupler driving units 1, several half-bridge driving units 2, and several buck units 3 to form a highly efficient integrated driving system. The half-bridge driving units 2 are responsible for accurately obtaining power from an external power supply, enabling the buck units 3 to convert the power input from the half-bridge driving units 2 into a stable and suitable voltage, providing reliable power supply for the optocoupler driving units 1. The input terminal of the optocoupler driving unit 1 is closely connected to the digital signal processor 5 of the vehicle-mounted bidirectional power supply to ensure efficient signal transmission, while its output terminal is precisely connected to the insulated-gate bipolar transistor 4 of the vehicle-mounted bidirectional power supply. The number of optocoupler driving units 1 is related to the IGBT drive system. The number of GBTs is completely consistent, forming a one-to-one match. The circuit design of this application achieves a significant simplification of the circuit structure, reducing the risk of failure that may be caused by complex circuits, thereby significantly improving the reliability and stability of the system. Furthermore, the circuit design can flexibly adapt to different numbers of insulated gate bipolar transistors 4, effectively responding to changes in the on-board bidirectional power supply requirements, demonstrating its high adaptability. In addition, the application of the optocoupler drive unit 1 ensures efficient and stable signal transmission, equipping the on-board bidirectional power supply system with an efficient control mechanism, enabling it to maintain efficient, stable and reliable operation under various working conditions.

[0029] In this embodiment, the digital signal processor 5 of the vehicle-mounted bidirectional power supply is existing technology and can be composed of a DSPAVP32F335 chip and its peripheral circuits.

[0030] Further, please refer to Figure 2The optocoupler driving unit 1 includes an optocoupler U13. Pins A and K of the optocoupler U13 are used to connect to the digital signal processor 5 of the vehicle bidirectional power supply. Pins VCC and VEE of the optocoupler U13 are connected to the output terminal of the step-down unit 3. Pin Vout of the optocoupler U13 is used to connect to the insulated gate bipolar transistor 4 of the vehicle bidirectional power supply.

[0031] Further, please refer to Figure 2 The optocoupler driving unit 1 further includes a current limiting section and a conduction control section. The output terminal of the current limiting section is connected to pin A of the optocoupler U13, and the output terminal of the conduction control section is connected to pin K of the optocoupler U13. The input terminals of the current limiting section and the conduction control section are respectively used to connect to the digital signal processor 5 of the vehicle bidirectional power supply.

[0032] Further, please refer to Figure 2 The optocoupler driving unit 1 further includes an electrostatic protection section and a first indicator section. The pin Vout of the optocoupler U13 is connected to the insulated gate bipolar transistor 4 of the vehicle bidirectional power supply through the electrostatic protection section and the first indicator section.

[0033] In this embodiment, please refer to Figure 2 The optocoupler U13 is model NSi6801TC-DDBR; the current limiting section includes resistors R184 and R188; the conduction control section includes a field-effect transistor Q15; the electrostatic protection section includes a bidirectional diode D7; the first indicator section includes a light-emitting diode BK and a resistor R77; one end of resistor R184 and one end of resistor R188 are respectively used to connect to an external power supply device, which provides a 12V DC voltage; the other end of resistor R184, the other end of resistor R188, and the output terminal of digital signal processor 5 are respectively connected to pin A of optocoupler U13. The output terminal of the digital signal processor 5 is connected to the gate of the field-effect transistor Q15, and the drain of the field-effect transistor Q15 is connected to pin K of the optocoupler U13. The pin Vout of the optocoupler U13 is connected to one end of the bidirectional diode D7 and the positive terminal of the light-emitting diode BK, respectively. The negative terminal of the light-emitting diode BK is connected to one end of the resistor R77. The other end of the resistor R77 and the pins VCC and VEE of the optocoupler U13 are connected to the output terminal of the step-down unit 3, respectively. The pin Vout of the optocoupler U13 is also used to connect the insulated-gate bipolar transistor 4 of the vehicle bidirectional power supply.

[0034] In this embodiment, firstly, the digital signal processor 5 of the vehicle bidirectional power supply is connected to pins A and K of the optocoupler U13, realizing the conversion between digital and optical signals, enhancing the anti-interference capability of the signal, and ensuring stable signal transmission. Simultaneously, pins VCC and VEE of the optocoupler U13 are connected to the output of the step-down unit 3, ensuring a stable operating voltage for the optocoupler U13 and improving circuit reliability. Secondly, the current limiting section limits the current through resistors R184 and R188, preventing excessive current from damaging the circuit. The conduction control section controls the conduction of the optocoupler U13 through the field-effect transistor Q15, achieving precise signal control. Furthermore, the electrostatic protection section includes a bidirectional diode D7, which effectively prevents electrostatic interference and damage to the circuit, improving the circuit's anti-static capability. The first indicator section includes a light-emitting diode BK and a resistor R77, which can intuitively indicate the operating status of the optocoupler U13, facilitating troubleshooting and maintenance.

[0035] In this embodiment, the +15V and -10V power supplies required to drive the IGBT are generated by the buck unit 3. Each IGBT is equipped with a +15V and -10V power supply, that is, each IGBT is equipped with a combination of a half-bridge drive unit 2 and a buck unit 3.

[0036] Further, please refer to Figure 3 The half-bridge drive unit 2 includes a first half-bridge drive section and a second half-bridge drive section. The input terminals of the first half-bridge drive section and the second half-bridge drive section are respectively used to connect to the digital signal processor 5 of the vehicle bidirectional power supply. The power supply terminals of the first half-bridge drive section and the second half-bridge drive section are respectively used to connect to an external power supply device. The output terminals of the first half-bridge drive section and the second half-bridge drive section are respectively connected to the input terminal of the buck unit 3.

[0037] Further, please refer to Figure 3 The circuit structure of the first half-bridge driver is the same as that of the second half-bridge driver. The first half-bridge driver includes a voltage divider group, a half-bridge driver chip U38, a first filter group, and a square wave generator group. The input terminal of the voltage divider group is used to connect to the digital signal processor 5 of the vehicle bidirectional power supply. The output terminal of the voltage divider group is connected to the HIN and LIN pins of the half-bridge driver chip U38, and is connected to the VCC pin of the half-bridge driver chip U38 through the first filter group. The HO and LO pins of the half-bridge driver chip U38 are respectively connected to the input terminal of the square wave generator group, and the output terminal of the square wave generator group is connected to the input terminal of the step-down unit 3.

[0038] In this embodiment, please refer to Figure 3The half-bridge driver chip U38 is model EG2131. The voltage divider group includes MOSFET Q16, resistors R168, R169, R159, and R158. The first filter group includes a 40th capacitor C40. The square wave generation group includes resistors R147 and R148, MOSFET U372, resistors R160 and R161, and MOSFET U371. Both MOSFETs U371 and U372 are model WSD409. 8; The source of the field-effect transistor Q16 is connected to the digital signal processor 5. The drain of the field-effect transistor Q16 is connected to one end of the resistor R168 and one end of the resistor R169. The gate of the field-effect transistor Q16 is connected to one end of the fortieth capacitor C40 and the VCC pin of the half-bridge driver chip U38. The other end of the resistor R168, the other end of the resistor R169, one end of the resistor R159, and one end of the resistor R158 are respectively connected to the half-bridge driver chip U38. Pins HIN and LIN of the half-bridge driver chip U38 are connected. The other ends of resistors R159 and R158 and capacitor C40 are connected to pin GND of the half-bridge driver chip U38. Pins HO of the half-bridge driver chip U38 are connected to one end of resistor R147 and one end of resistor R148. The other ends of resistors R147 and R148 are connected to the gate of the field-effect transistor U372. Pin LO of the half-bridge driver chip U38 is connected to one end of resistor R160 and one end of resistor R161. The other ends of resistors R160 and R161 are connected to the gate of the field-effect transistor U371. The drain of the field-effect transistor U371 is connected to the source of the field-effect transistor U372. This connection is used to generate an AC square wave. The source of the field-effect transistor U371 and the drain of the field-effect transistor U372 are connected to an external power supply device, which provides a 12V voltage.

[0039] In this embodiment, firstly, by designing a half-bridge drive unit 2 comprising a first half-bridge drive section and a second half-bridge drive section, effective driving of the insulated gate transistor of the vehicle bidirectional power supply is achieved. The circuit structures of the first and second half-bridge drive sections are identical, both including a voltage divider group, a half-bridge drive chip U38, a first filter group, and a square wave generation group. This design not only simplifies the circuit structure but also improves the reliability and stability of the circuit. Secondly, the coordinated use of the voltage divider group, the first filter group, and the square wave generation group ensures that the half-bridge drive chip U38 receives a stable input signal, and this signal is transmitted through the pins HO and HO of the half-bridge drive chip U38. The LO output drive signal drives the buck unit 3 to work normally; the voltage divider group can divide the input signal to ensure that the input voltage of the half-bridge driver chip U38 is within a reasonable range; the first filter group can filter the input signal to eliminate interference components in the signal; the square wave generation group can generate an AC square wave to provide a stable drive signal for the buck unit 3; in addition, the half-bridge driver chip U38 selected in this embodiment is model EG2131, and the field effect transistors Q16, U371 and U372 are all model WSD4098. These components have stable performance and high reliability, which can ensure the normal operation of the half-bridge driver unit 2.

[0040] Further, please refer to Figure 4 The step-down unit 3 includes a transformer T1, an upper arm drive unit, and a lower arm drive unit. The primary side of the transformer T1 is connected to the output terminal of the half-bridge drive unit 2, the secondary side of the transformer T1 is connected to the input terminal of the upper arm drive unit, and the tertiary side of the transformer T1 is connected to the input terminal of the lower arm drive unit. The output terminals of the upper arm drive unit and the lower arm drive unit are respectively connected to the power supply terminal of the optocoupler drive unit 1 and are used to connect the upper arm and lower arm of the insulated gate bipolar transistor 4, respectively.

[0041] Further, please refer to Figure 4 The structure of the upper arm drive unit is the same as that of the lower arm drive unit. The upper arm drive unit includes a rectifier group, a second filter group, and an indicator group. One end of the rectifier group is connected to the secondary side of the transformer T1. The other end of the rectifier group and the second filter group are respectively connected to the power supply terminal of the optocoupler drive unit 1 and are used to connect to the upper arm of the insulated gate bipolar transistor 4. The indicator group is connected to the second filter group.

[0042] In this embodiment, please refer to Figure 4The rectifier group includes diodes D19 and D30, the second filter group includes multiple capacitors connected in parallel, and the indicator group includes a light-emitting diode BH and a resistor R171. The anode of diode D19 and the cathode of diode D30 are respectively connected to the secondary side of transformer T1. The cathode of diode D19 is connected to the second filter group and the anode of light-emitting diode BH. The anode of diode D30 is connected to the second filter group and the other end of resistor R171. The other end of light-emitting diode BH is connected to one end of resistor R171.

[0043] In this embodiment, firstly, the output voltage of the half-bridge drive unit 2 is transformed by transformer T1 to provide the required drive voltage for the upper arm drive unit and the lower arm drive unit respectively. This design not only simplifies the circuit structure but also improves the efficiency and stability of voltage transformation. Secondly, the upper arm drive unit and the lower arm drive unit adopt the same structural design, including a rectifier group, a second filter group, and an indicator group. This modular design facilitates production and maintenance and reduces costs. At the same time, the rectifier group rectifies the AC voltage output from the secondary and tertiary sides of transformer T1 into DC voltage, providing a stable DC power supply for subsequent filtering and driving. Furthermore, the second filter group filters the rectified DC voltage through multiple parallel capacitors, further improving voltage stability and reducing the impact of voltage fluctuations on the driving of the insulated gate bipolar transistor 4. Finally, the indicator group, through the combination of LED BH and resistor R171, can intuitively display the working status of the upper arm drive unit and the lower arm drive unit. When the upper arm drive unit is working normally, LED BH will light up, providing technicians with a convenient means of troubleshooting.

[0044] This utility model also provides a PCB board, on which the IGBT driving circuit as described above is printed.

[0045] This utility model also provides a vehicle-mounted bidirectional power supply, wherein the vehicle-mounted bidirectional power supply uses the IGBT drive circuit described above to realize the operation control of the insulated gate bipolar transistor 4.

[0046] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. An IGBT driving circuit, characterized in that, It includes several optocoupler driving units, several half-bridge driving units, and several buck units; the input terminal of the half-bridge driving unit is used to connect to an external power supply device, and the output terminal of the half-bridge driving unit is connected to the input terminal of the buck unit; the output terminal of the buck unit is connected to the power supply terminal of the optocoupler driving unit and is used to connect to the insulated-gate bipolar transistor of the vehicle bidirectional power supply; the input terminal of the optocoupler driving unit is used to connect to the digital signal processor of the vehicle bidirectional power supply, and the output terminal of the optocoupler driving unit is used to connect to the insulated-gate bipolar transistor of the vehicle bidirectional power supply. The number of optocoupler driving units, the number of half-bridge driving units, and the number of buck units are consistent with and correspond one-to-one with the number of insulated-gate bipolar transistors of the vehicle bidirectional power supply.

2. The IGBT driving circuit according to claim 1, wherein The optocoupler driving unit includes an optocoupler U13. Pins A and K of the optocoupler U13 are used to connect to the digital signal processor of the vehicle bidirectional power supply, pins VCC and VEE of the optocoupler U13 are connected to the output terminal of the buck unit, and pin Vout of the optocoupler U13 is used to connect to the insulated gate bipolar transistor of the vehicle bidirectional power supply.

3. The IGBT driving circuit according to claim 2, wherein The optocoupler driving unit further includes a current limiting section and a conduction control section. The output terminal of the current limiting section is connected to pin A of the optocoupler U13, and the output terminal of the conduction control section is connected to pin K of the optocoupler U13. The input terminals of the current limiting section and the conduction control section are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply.

4. The IGBT driving circuit according to claim 2, wherein The optocoupler driving unit also includes an electrostatic protection section and a first indicator section. The pin Vout of the optocoupler U13 is connected to the insulated gate bipolar transistor of the vehicle bidirectional power supply through the electrostatic protection section and the first indicator section.

5. The IGBT driving circuit according to claim 1, wherein The half-bridge drive unit includes a first half-bridge drive section and a second half-bridge drive section. The input terminals of the first half-bridge drive section and the second half-bridge drive section are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply. The power supply terminals of the first half-bridge drive section and the second half-bridge drive section are respectively used to connect to an external power supply device. The output terminals of the first half-bridge drive section and the second half-bridge drive section are respectively connected to the input terminal of the buck unit.

6. An IGBT drive circuit according to claim 5, wherein The circuit structure of the first half-bridge driver is the same as that of the second half-bridge driver. The first half-bridge driver includes a voltage divider group, a half-bridge driver chip U38, a first filter group, and a square wave generator group. The input terminal of the voltage divider group is used to connect to the digital signal processor of the vehicle bidirectional power supply. The output terminal of the voltage divider group is connected to the HIN and LIN pins of the half-bridge driver chip U38, and is connected to the VCC pin of the half-bridge driver chip U38 through the first filter group. The HO and LO pins of the half-bridge driver chip U38 are respectively connected to the input terminal of the square wave generator group, and the output terminal of the square wave generator group is connected to the input terminal of the buck unit.

7. The IGBT driving circuit according to claim 1, wherein The step-down unit includes a transformer T1, an upper arm drive unit, and a lower arm drive unit. The primary side of the transformer T1 is connected to the output terminal of the half-bridge drive unit, the secondary side of the transformer T1 is connected to the input terminal of the upper arm drive unit, and the tertiary side of the transformer T1 is connected to the input terminal of the lower arm drive unit. The output terminals of the upper arm drive unit and the lower arm drive unit are respectively connected to the power supply terminal of the optocoupler drive unit and are used to connect the upper arm and lower arm of the insulated gate bipolar transistor, respectively.

8. The IGBT driving circuit according to claim 7, wherein The structure of the upper arm drive unit is the same as that of the lower arm drive unit; the upper arm drive unit includes a rectifier group, a second filter group and an indicator group. One end of the rectifier group is connected to the secondary side of the transformer T1, and the other end of the rectifier group and the second filter group are respectively connected to the power supply terminal of the optocoupler drive unit and are used to connect the upper arm of the insulated gate bipolar transistor; the indicator group is connected to the second filter group.

9. A PCB board characterized by, The PCB board is printed with an IGBT drive circuit as described in any one of claims 1-8.

10. A vehicle-mounted bidirectional power supply, characterized in that, The on-board bidirectional power supply uses the IGBT drive circuit as described in any one of claims 1-8 to realize the operation control of the insulated gate bipolar transistor.

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