High-pressure anti-reverse protection circuit and method for vehicle-mounted electronic oil pump

Abstract

The invention relates to a high-voltage anti-reverse protection circuit and method for a vehicle-mounted electronic oil pump, and relates to the field of electronic circuit design. The invention provides an innovative high-voltage protection and reverse connection prevention strategy for the vehicle-mounted electronic oil pump, and by introducing the high-voltage protection circuit, the voltage withstand level of an electronic device is remarkably reduced. Specifically, the high-voltage protection circuit can quickly respond when the voltage exceeds a preset threshold value, and over-high voltage impact is effectively inhibited, so that the voltage withstand level of an electronic device is reduced from 50V to 35V. The improvement not only reduces the withstand voltage level of the rear-end device, but also saves the space of the PCBA, so that the overall design is more compact. In addition, by reducing the voltage withstand level of the electronic device, the manufacturing cost of the electronic oil pump can be remarkably reduced, and the market competitiveness of the electronic oil pump is improved. Meanwhile, the high-voltage protection circuit also has a reverse connection prevention function, so that the electronic oil pump can be protected from being damaged when the battery is reversely connected, and the reliability and the safety of the system are further enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuit design, and in particular to a high-voltage anti-reverse protection circuit and method for an on-vehicle electronic oil pump. Background Art

[0002] At present, 24V on-board electronic oil pumps need to meet strict electrical performance requirements when they are designed, one of which is to be able to withstand a 36V voltage for up to 1 minute under normal operating conditions. This requirement is to ensure that the on-board electronic oil pump can work stably at the moment of vehicle startup or other abnormal conditions to avoid damage caused by voltage fluctuations.

[0003] However, in order to meet this withstand voltage test requirement, existing automotive electronic oil pump designs generally use electronic devices with a withstand voltage rating of 50V. Although these high-voltage electronic devices can ensure the reliability of automotive electronic oil pumps under extreme conditions, their high cost has become an important factor restricting the widespread application of automotive electronic oil pumps. In addition, the use of high-voltage electronic devices also leads to an increase in the space occupied by the PCBA (Printed Circuit Board Assembly), affecting the compactness and flexibility of the overall design.

[0004] Therefore, how to reduce the cost and size of the on-board electronic oil pump while ensuring its performance has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a high-voltage anti-reverse protection circuit and method for an on-vehicle electronic oil pump to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit, comprising: MOS tube T8, whose drain D is connected to the first end of the resistor R38 and connected to the positive power supply T30_1, the gate G of the MOS tube T8 is connected to the second end of the resistor R38 and connected to the first end of the resistor R73, the gate G of the MOS tube T8 is also connected to the first end of the resistor R69, and the second end of the resistor R69 is connected to the VCP pin of the single chip computer; MOS tube T12, whose drain D is connected to the second end of the resistor R73, whose gate G is connected to the first end of the resistor R48 and connected to the VINOFF pin of the microcontroller, whose second end is connected to the source S of the MOS tube T12 and connected to the negative power supply GND; A MOS transistor T7, whose gate G is connected to a first end of a resistor R9, whose second end is connected to a VCP pin of a single chip computer, whose source S is connected to a first end of a resistor R42, whose second end is connected to a gate G of the MOS transistor T7; and A transistor T10, an emitter E of which is connected to the source S of the MOS transistor T7 and the source S of the MOS transistor T8, a collector C of the transistor T10 is connected to the first end of the resistor R9, a base B of the transistor T10 is connected to the first end of the resistor R8, and a second end of the resistor R8 is connected to the negative electrode GND of the power supply; Among them, the drain D of the MOS tube T7 is connected to the positive pole PT30_3 of the DC bus of the vehicle-mounted electronic oil pump, the negative pole of the DC bus of the vehicle-mounted electronic oil pump is connected to the negative pole of the power supply GND, and the electrolytic capacitor C23, electrolytic capacitor C24, electrolytic capacitor C25, and electrolytic capacitor C26 are connected in parallel between the positive pole PT30_3 of the DC bus of the vehicle-mounted electronic oil pump and the negative pole of the DC bus of the vehicle-mounted electronic oil pump.

[0007] In a possible implementation, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit further includes: The capacitor C85 has a first end connected to the gate G of the MOS transistor T8 and a second end connected to the source S of the MOS transistor T8.

[0008] In a possible implementation, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit further includes: The voltage stabilizing diode D17 has an anode connected to the gate G of the MOS transistor T8 and a cathode connected to the source S of the MOS transistor T8.

[0009] In a possible implementation, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit further includes: The voltage stabilizing diode D19 has an anode connected to the drain D of the MOS transistor T12 and a cathode connected to the source S of the MOS transistor T12.

[0010] In a possible implementation, a diode D14 is connected between the second end of the resistor R69 and the VCP pin of the microcontroller, the anode of the diode D14 is connected to the VCP pin of the microcontroller, and the cathode of the diode D14 is connected to the second end of the resistor R69.

[0011] In a possible implementation, a diode D11 is connected between the second end of the resistor R9 and the VCP pin of the microcontroller, the anode of the diode D11 is connected to the VCP pin of the microcontroller, and the cathode of the diode D11 is connected to the second end of the resistor R9.

[0012] In a possible implementation, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit further includes: The capacitor C13 has a first end connected to the emitter E of the transistor T10 , and a second end connected to the base B of the transistor T10 .

[0013] In a possible implementation, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit further includes: The capacitor C2 has a first end connected to the gate G of the MOS transistor T7 and a second end connected to the source S of the MOS transistor T7.

[0014] In a second aspect, the present invention provides a method for high-voltage reverse protection of an on-board electronic oil pump, the method being applicable to the high-voltage reverse protection circuit of the on-board electronic oil pump as described above, the method comprising: When the power is turned on normally, the input voltage passes through the positive electrode T30_1 of the power supply, flows through the resistor R38, flows from the drain D of the MOS tube T8 through its source S, and then flows from the source S of the MOS tube T7 to its drain D, charging the electrolytic capacitors C23, C24, C25, and C26 at the rear end; In response to the input voltage rising to 6V, the charge pump of the single-chip microcomputer starts to work, and the VCP pin of the single-chip microcomputer generates a VCP voltage higher than the input voltage 12V, turning on the MOS tube T8 and the MOS tube T7, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned on to supply power to the motor three-phase bridge bus of the rear-end vehicle-mounted electronic oil pump; In response to the input voltage being stable at 24V, the MOS tube T7 and the MOS tube T8 are in a conducting state, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned on to ensure the voltage input during normal operation; In response to the input voltage being greater than 32V, the MOS tube T8 is turned off, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned off; In response to the input voltage being greater than 35V, the VINOFF pin of the single chip microcomputer is set to a high level, the MOS tube T12 is turned on, the MOS tube T8 is turned off, the gate G voltage of the MOS tube T8 is reduced, and the DC bus positive electrode PT30_3 of the on-board electronic oil pump is turned off to avoid damage to the rear-end electronic devices; In response to the input voltage dropping to 32V, the VINOFF pin of the single chip microcomputer is set to a low level, the MOS tube T8 is turned on, and the DC bus positive electrode PT30_3 of the vehicle electronic oil pump is turned on again; The switching state of the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is repeated in this way to ensure that the voltage value of the rear-end circuit of the MOS tube T8 does not exceed 35V, thereby reducing the withstand voltage level of the rear-end electronic components.

[0015] In a possible implementation, the method further includes: In response to the voltage reversal, the voltage quickly turns on the transistor T10 through the resistor R8, causing the voltage of the gate G and the drain D of the MOS transistor T7 to drop to 0.7V, thereby turning off the MOS transistor T7 to achieve reverse connection protection.

[0016] The beneficial effects brought about by the technical solution provided by the present invention include at least: The present invention provides an innovative high-voltage protection and anti-reverse connection strategy for an on-board electronic oil pump. By introducing a high-voltage protection circuit, the withstand voltage level of the electronic device is significantly reduced. Specifically, the high-voltage protection circuit can respond quickly when the voltage exceeds a predetermined threshold, effectively suppressing excessive voltage shocks, thereby reducing the withstand voltage level of the electronic device from 50V to 35V. This improvement not only reduces the withstand voltage level of the back-end device, but also saves space for PCBA, making the overall design more compact. In addition, by reducing the withstand voltage level of the electronic device, the present invention can significantly reduce the manufacturing cost of the electronic oil pump and improve its market competitiveness. At the same time, the high-voltage protection circuit also has an anti-reverse connection function, which can protect the electronic oil pump from damage when the battery is reversed, further enhancing the reliability and safety of the system. In short, the present invention provides an efficient, economical and reliable solution, which brings new possibilities for the design and application of on-board electronic oil pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] Figure 1 A schematic structural diagram of a high-voltage anti-reverse protection circuit for an on-vehicle electronic oil pump provided by an exemplary embodiment of the present invention is shown.

[0019] Figure 2 A logic block diagram of a vehicle-mounted electronic oil pump high-pressure reverse protection method provided by an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0020] 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 only 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.

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1A schematic structural diagram of a high-voltage reverse protection circuit for an on-vehicle electronic oil pump provided by an exemplary embodiment of the present invention is shown. The high-voltage reverse protection circuit for an on-vehicle electronic oil pump includes: a MOS tube T8, a MOS tube T12, a MOS tube T7, and a triode T10.

[0023] In detail, the drain D of the MOS tube T8 is connected to the first end of the resistor R38 and is connected to the positive power supply T30_1, the gate G of the MOS tube T8 is connected to the second end of the resistor R38 and is connected to the first end of the resistor R73, and the gate G of the MOS tube T8 is also connected to the first end of the resistor R69, and the second end of the resistor R69 is connected to the VCP pin of the single-chip computer. This connection method ensures that the single-chip computer can accurately control the on and off states of the MOS tube T8 through the control voltage output by the VCP pin. In this way, not only the effective control of the MOS tube T8 is achieved, but also the necessary voltage division and current limiting protection are provided through the resistors R38 and R69, thereby improving the stability and reliability of the system.

[0024] It is worth mentioning that the VCP pin (Voltage Control Pin) of the microcontroller is a dedicated pin for generating and outputting control voltage. The voltage output by this pin can control the on and off state of the MOS tube. In the on-board electronic oil pump system, the high voltage (usually higher than the input voltage of 12V) output by the VCP pin of the microcontroller is connected to the gate of the MOS tube through a resistor, turning on the MOS tube, thereby achieving precise control and protection of the circuit.

[0025] In the embodiment of the present application, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit also includes a capacitor C85, a first end of which is connected to the gate G of the MOS tube T8, and a second end of which is connected to the source S of the MOS tube T8. By connecting the capacitor C85 between the gate G and the source S of the MOS tube T8, the effect of filtering and stabilizing the gate voltage can be achieved. The capacitor C85 can filter out the high-frequency noise and voltage spikes on the gate, ensuring that the gate voltage of the MOS tube T8 is more stable, thereby improving the switching reliability of the MOS tube and the stability of the entire circuit. In addition, the capacitor C85 can also quickly release the charge on the gate when the MOS tube T8 is turned off, speed up the turn-off speed of the MOS tube, and avoid misoperation caused by gate voltage fluctuations.

[0026] In the embodiment of the present application, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit also includes a voltage stabilizing diode D17, whose positive electrode is connected to the gate G of the MOS tube T8, and whose negative electrode is connected to the source S of the MOS tube T8. By connecting the voltage stabilizing diode D17 between the gate G and the source S of the MOS tube T8, the gate voltage can be effectively clamped to prevent the gate voltage from exceeding the safety range. The positive electrode of the voltage stabilizing diode D17 is connected to the gate G of the MOS tube T8, and the negative electrode is connected to the source S. When the gate voltage exceeds the breakdown voltage of the voltage stabilizing diode, D17 is turned on and the excess voltage is discharged to the source S, thereby protecting the MOS tube T8 from being damaged by excessively high gate voltage and ensuring the stability and reliability of the circuit.

[0027] In the embodiment of the present application, a diode D14 is further connected between the second end of the resistor R69 and the VCP pin of the single-chip computer, the positive electrode of the diode D14 is connected to the VCP pin of the single-chip computer, and the negative electrode of the diode D14 is connected to the second end of the resistor R69. By connecting the diode D14 between the second end of the resistor R69 and the VCP pin of the single-chip computer, it is possible to prevent the current from flowing reversely from the gate G of the MOS tube T8 to the VCP pin of the single-chip computer, thereby protecting the single-chip computer from damage caused by excessive reverse voltage. The positive electrode of the diode D14 is connected to the VCP pin of the single-chip computer, and the negative electrode is connected to the second end of the resistor R69, ensuring that the current can only flow from the VCP pin of the single-chip computer to the gate G of the MOS tube T8, and will not flow in the opposite direction, thereby improving the stability and reliability of the circuit.

[0028] Further, the drain D of the MOS tube T12 is connected to the second end of the resistor R73, the gate G of the MOS tube T12 is connected to the first end of the resistor R48 and is connected to the VINOFF pin of the single-chip computer, and the second end of the resistor R48 is connected to the source S of the MOS tube T12 and is connected to the negative power supply GND. By adding the MOS tube T12 to the circuit, its drain D is connected to the second end of the resistor R73, the gate G is connected to the first end of the resistor R48 and is connected to the VINOFF pin of the single-chip computer, and the source S is connected to the second end of the resistor R48 and is connected to the negative power supply GND, the gate voltage of the MOS tube T8 can be accurately controlled. When the single-chip computer detects that the input voltage exceeds 35V, a high level is output through the VINOFF pin to turn on the MOS tube T12, thereby lowering the gate G voltage of the MOS tube T8, turning off the MOS tube T8, cutting off the DC bus, and protecting the back-end circuit from overvoltage damage. When the voltage drops to 32V, the microcontroller outputs a low level through the VINOFF pin, turning off the MOS tube T12 and restoring the normal working state of the MOS tube T8, thereby realizing dynamic protection and control of the circuit.

[0029] It is worth mentioning that the VINOFF pin of the microcontroller is a dedicated pin for outputting control signals. The high or low level signal output by this pin can control the state of the external circuit.

[0030] In the embodiment of the present application, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit also includes a voltage stabilizing diode D19, whose positive electrode is connected to the drain D of the MOS tube T12, and whose negative electrode is connected to the source S of the MOS tube T12. By connecting the voltage stabilizing diode D19 between the drain D and the source S of the MOS tube T12, the drain-source voltage of the MOS tube T12 can be effectively clamped to prevent the drain-source voltage from exceeding the safety range. The positive electrode of the voltage stabilizing diode D19 is connected to the drain D of the MOS tube T12, and the negative electrode is connected to the source S. When the drain-source voltage exceeds the breakdown voltage of the voltage stabilizing diode, D19 is turned on to discharge the excess voltage, thereby protecting the MOS tube T12 from excessive voltage damage and ensuring the stability and reliability of the circuit.

[0031] Furthermore, the gate G of the MOS tube T7 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the VCP pin of the single-chip computer, the source S of the MOS tube T7 is connected to the first end of the resistor R42, and the second end of the resistor R42 is connected to the gate G of the MOS tube T7; wherein, the drain D of the MOS tube T7 is connected to the positive electrode PT30_3 of the DC bus of the vehicle-mounted electronic oil pump, the negative electrode of the DC bus of the vehicle-mounted electronic oil pump is connected to the negative electrode GND of the power supply, and the positive electrode PT30_3 of the DC bus of the vehicle-mounted electronic oil pump and the negative electrode of the DC bus of the vehicle-mounted electronic oil pump are connected in parallel with the electrolytic capacitor C23, the electrolytic capacitor C24, the electrolytic capacitor C25, and the electrolytic capacitor C26. By connecting the gate G of the MOS tube T7 to the first end of the resistor R9 and the second end of the resistor R9 to the VCP pin of the single-chip computer, it is ensured that the single-chip computer can control the conduction state of the MOS tube T7 through the high voltage output by the VCP pin. The source S of the MOS tube T7 is connected to the first end of the resistor R42, and the second end of the resistor R42 is connected to the gate G of the MOS tube T7, forming a feedback loop to stabilize the gate voltage and ensure the reliable conduction of the MOS tube T7. The drain D of the MOS tube T7 is connected to the positive electrode PT30_3 of the DC bus of the vehicle-mounted electronic oil pump, and the negative electrode of the DC bus is connected to the negative electrode GND of the power supply. Electrolytic capacitors C23, C24, C25 and C26 are connected in parallel between the positive electrode PT30_3 of the DC bus and the negative electrode of the DC bus, which are used to filter and stabilize the DC bus voltage to ensure the power supply stability and reliability of the three-phase bridge bus of the oil pump motor.

[0032] In the embodiment of the present application, a diode D11 is further connected between the second end of the resistor R9 and the VCP pin of the single-chip computer, the positive electrode of the diode D11 is connected to the VCP pin of the single-chip computer, and the negative electrode of the diode D11 is connected to the second end of the resistor R9. By connecting the diode D11 between the second end of the resistor R9 and the VCP pin of the single-chip computer, it is possible to prevent the current from flowing reversely from the gate G of the MOS tube T7 to the VCP pin of the single-chip computer, thereby protecting the single-chip computer from damage caused by excessive reverse voltage. The positive electrode of the diode D11 is connected to the VCP pin of the single-chip computer, and the negative electrode is connected to the second end of the resistor R9, ensuring that the current can only flow from the VCP pin of the single-chip computer to the gate G of the MOS tube T7, and will not flow in the opposite direction, thereby improving the stability and reliability of the circuit.

[0033] In the embodiment of the present application, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit also includes a capacitor C2, a first end of which is connected to the gate G of the MOS tube T7, and a second end of which is connected to the source S of the MOS tube T7. By connecting the capacitor C2 between the gate G and the source S of the MOS tube T7, the effect of filtering and stabilizing the gate voltage can be achieved. The capacitor C2 can filter out the high-frequency noise and voltage spikes on the gate, ensuring that the gate voltage of the MOS tube T7 is more stable, thereby improving the switching reliability of the MOS tube and the stability of the entire circuit. In addition, the capacitor C2 can also quickly release the charge on the gate when the MOS tube T7 is turned off, speed up the turn-off speed of the MOS tube, and avoid misoperation caused by gate voltage fluctuations.

[0034] Specifically, the emitter E of the transistor T10 is connected to the source S of the MOS transistor T7 and the source S of the MOS transistor T8, the collector C of the transistor T10 is connected to the first end of the resistor R9, the base B of the transistor T10 is connected to the first end of the resistor R8, and the second end of the resistor R8 is connected to the negative electrode GND of the power supply. By connecting the emitter E of the transistor T10 to the source S of the MOS transistors T7 and MOS transistors T8, the collector C is connected to the first end of the resistor R9, the base B is connected to the first end of the resistor R8, and the second end of the resistor R8 is connected to the negative electrode GND of the power supply, the reverse connection protection function of the MOS transistor T7 can be realized. When the power supply is reversely connected, the voltage quickly turns on the transistor T10 through the resistor R8, causing the voltage between the gate G and the source S of the MOS transistor T7 to drop to about 0.7V, thereby turning off the MOS transistor T7, preventing the reverse current from flowing into the circuit through the MOS transistor T7, and protecting the entire system from reverse connection damage. This setting ensures the reliability and safety of the circuit when the power supply is reversely connected.

[0035] In the embodiment of the present application, the vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit also includes a capacitor C13, a first end of which is connected to the emitter E of the triode T10, and a second end of which is connected to the base B of the triode T10. By connecting the capacitor C13 between the emitter E and the base B of the triode T10, the effect of filtering and stabilizing the base voltage can be achieved. The capacitor C13 can filter out the high-frequency noise and voltage spikes on the base, ensuring that the base voltage of the triode T10 is more stable, thereby improving the switching reliability of the triode T10 and the stability of the entire circuit. In addition, the capacitor C13 can also respond quickly and turn on the triode T10 when the power supply is reversed, ensuring that the MOS tube T7 is quickly turned off, preventing the reverse current from flowing into the circuit through the MOS tube T7, and protecting the entire system from reverse connection damage. This arrangement ensures the reliability and safety of the circuit when the power supply is reversed.

[0036] Figure 2 A logic block diagram of a vehicle-mounted electronic oil pump high-voltage reverse protection method provided by an exemplary embodiment of the present invention is shown. The vehicle-mounted electronic oil pump high-voltage reverse protection method is applicable to the vehicle-mounted electronic oil pump high-voltage reverse protection circuit as described above. The method includes: S1. When the power is turned on normally, the input voltage passes through the positive electrode T30_1 of the power supply, flows through the resistor R38, flows from the drain D of the MOS tube T8 through its source S, and then flows from the source S of the MOS tube T7 to its drain D, charging the electrolytic capacitors C23, C24, C25, and C26 at the rear end.

[0037] In the embodiment of the present application, when the system is powered on normally, the voltage of the positive power supply T30_1 is transmitted to the drain D of the MOS tube T8 through the resistor R38. Since the voltage of the source S of the MOS tube T8 is 0 at this time, a voltage difference is generated between the gate G and the source S, and the MOS tube T8 is turned on. The current flows from the drain D of the MOS tube T8 through the source S, and then flows from the source S of the MOS tube T7 through the parasitic diode to the drain D of the MOS tube T7, and finally charges the electrolytic capacitors C23, C24, C25 and C26 at the back end, providing a stable power supply for the normal operation of the subsequent circuit.

[0038] S2. In response to the input voltage rising to 6V, the charge pump of the microcontroller starts to work, and the VCP pin of the microcontroller generates a VCP voltage that is 12V higher than the input voltage, turning on the MOS tube T8 and the MOS tube T7, and the DC bus positive pole PT30_3 of the vehicle-mounted electronic oil pump is turned on to supply power to the three-phase bridge bus of the motor of the rear-end vehicle-mounted electronic oil pump.

[0039] In the embodiment of the present application, when the input voltage rises to about 6V, the charge pump inside the single-chip microcomputer starts to work, generating a control voltage (VCP) that is 12V higher than the input voltage. This VCP voltage is output through the VCP pin of the single-chip microcomputer and connected to the gate G of the MOS tube T8 and the MOS tube T7, so that the two MOS tubes are turned on. After the MOS tubes T8 and T7 are turned on, the DC bus positive pole PT30_3 of the on-board electronic oil pump is turned on, providing a stable DC power supply for the three-phase bridge bus of the rear motor, ensuring the normal operation of the motor.

[0040] S3. In response to the input voltage being stable at 24V, MOS tube T7 and MOS tube T8 are in the on state, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned on to ensure the voltage input during normal operation.

[0041] In the embodiment of the present application, when the input voltage is stable at 24V, MOS tube T7 and MOS tube T8 continue to remain in the on state, ensuring that the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is continuously turned on. This provides a stable 24V DC voltage for the motor three-phase bridge bus, ensuring the normal operation and current input of the oil pump motor.

[0042] S4, in response to the input voltage being greater than 32V, the MOS tube T8 is turned off, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned off.

[0043] In the embodiment of the present application, when the input voltage exceeds 32V, the single chip microcomputer detects this situation and turns off the MOS tube T8 through a control signal. After the MOS tube T8 is turned off, the DC bus positive electrode PT30_3 of the vehicle electronic oil pump is also turned off, cutting off the power supply of the motor three-phase bridge bus to prevent excessive voltage from damaging the motor and other electronic devices.

[0044] S5. In response to the input voltage being greater than 35V, the VINOFF pin of the single chip microcomputer is set to a high level, turning on the MOS tube T12 and turning off the MOS tube T8, so that the gate G voltage of the MOS tube T8 is reduced, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned off to avoid damage to the rear-end electronic devices.

[0045] In the embodiment of the present application, when the input voltage exceeds 35V, the VINOFF pin of the single-chip microcomputer outputs a high level and turns on the MOS tube T12. After the MOS tube T12 is turned on, the gate G voltage of the MOS tube T8 is pulled down, so that the MOS tube T8 is turned off. After the MOS tube T8 is turned off, the DC bus positive pole PT30_3 of the vehicle-mounted electronic oil pump is turned off, and the power supply of the motor three-phase bridge bus is cut off, so as to avoid excessive voltage causing permanent damage to the rear-end electronic devices.

[0046] S6. In response to the input voltage dropping to 32V, the VINOFF pin of the microcontroller is set to a low level, turning on the MOS tube T8, and the DC bus positive electrode PT30_3 of the on-board electronic oil pump is turned on again.

[0047] In the embodiment of the present application, when the input voltage drops to 32V, the single chip microcomputer detects this situation and sets the VINOFF pin to a low level through a control signal, turning off the MOS tube T12. After the MOS tube T12 is turned off, the gate G voltage of the MOS tube T8 is restored, and the MOS tube T8 is turned on again. After the MOS tube T8 is turned on, the DC bus positive pole PT30_3 of the vehicle-mounted electronic oil pump is turned on again, and the power supply of the motor three-phase bridge bus is restored.

[0048] S7, the switching state of the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is repeatedly changed to ensure that the voltage value of the rear-end circuit of the MOS tube T8 does not exceed 35V, thereby reducing the withstand voltage level of the rear-end electronic components.

[0049] In the embodiment of the present application, through the real-time monitoring and control of the single-chip microcomputer, the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump will repeatedly switch according to the change of the input voltage. This dynamic control ensures that the voltage value of the back-end circuit of the MOS tube T8 does not exceed 35V, thereby reducing the voltage resistance level requirements of the back-end electronic devices and improving the safety and reliability of the system.

[0050] S8, in response to the voltage reversal, the voltage quickly turns on the transistor T10 through the resistor R8, causing the voltage of the gate G and the drain D of the MOS tube T7 to drop to 0.7V, thereby turning off the MOS tube T7 to achieve reverse connection protection.

[0051] In the embodiment of the present application, when the positive and negative poles of the power supply are connected in reverse, that is, the positive pole of the power supply is connected to the position where the negative pole should be, and the negative pole is connected to the position where the positive pole should be, this situation is called voltage reversal. In the case of voltage reversal, the negative pole of the power supply (actually the positive pole now) is connected to the base B of the transistor T10 through the resistor R8. Since the resistance value of the resistor R8 is small, the reverse voltage can quickly pass through the resistor R8, so that the base B of the transistor T10 generates a sufficient forward bias voltage relative to the emitter E, thereby quickly turning on the transistor T10. When the transistor T10 is turned on, the conduction path between its collector C and the emitter E pulls down the voltage of the gate G and the drain D of the MOS transistor T7 to about 0.7V (this is the base-emitter voltage when the transistor is turned on). At this time, the voltage difference between the gate G and the source S of the MOS transistor T7 is not enough to turn it on, and the MOS transistor T7 is turned off. After the MOS tube T7 is turned off, the current path from the positive pole of the power supply to the back-end circuit is cut off, preventing the reverse current from flowing into the circuit through the MOS tube T7, and protecting the entire system from reverse connection damage. This setting ensures the reliability and safety of the circuit when the power supply is reversed.

[0052] In summary, the present invention provides an innovative high-voltage protection and anti-reverse connection strategy for an on-board electronic oil pump. By introducing a high-voltage protection circuit, the withstand voltage level of the electronic device is significantly reduced. Specifically, the high-voltage protection circuit can respond quickly when the voltage exceeds a predetermined threshold, effectively suppressing excessive voltage shocks, thereby reducing the withstand voltage level of the electronic device from 50V to 35V. This improvement not only reduces the withstand voltage level of the back-end device, but also saves space for PCBA, making the overall design more compact. In addition, by reducing the withstand voltage level of the electronic device, the present invention can significantly reduce the manufacturing cost of the electronic oil pump and improve its market competitiveness. At the same time, the high-voltage protection circuit also has an anti-reverse connection function, which can protect the electronic oil pump from damage when the battery is reversed, further enhancing the reliability and safety of the system. In short, the present invention provides an efficient, economical and reliable solution, which brings new possibilities for the design and application of on-board electronic oil pumps.

[0053] It should be understood that the specific examples herein are only intended to help those skilled in the art to better understand the present disclosure, rather than to limit the scope of the present invention.

[0054] It is understood that in the various implementations of this specification, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the present disclosure.

[0055] It can be understood that the various implementation modes described in this specification can be implemented individually or in combination, and the present disclosure is not limited to this.

[0056] Unless otherwise stated, all technical and scientific terms used in this disclosure have the same meaning as those generally understood by those skilled in the art of the technical field of this specification. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the scope of this specification. The term "and / or" used in this specification includes any and all combinations of one or more related listed items. The singular forms of "a", "above", and "the" used in this disclosure and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0057] The above is only a specific implementation of this specification, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in this specification, which should be included in the protection scope of this specification. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high voltage anti-reverse protection circuit for an on-vehicle electronic oil pump, characterized in that: include: MOS tube T8, whose drain D is connected to the first end of the resistor R38 and connected to the positive power supply T30_1, the gate G of the MOS tube T8 is connected to the second end of the resistor R38 and connected to the first end of the resistor R73, the gate G of the MOS tube T8 is also connected to the first end of the resistor R69, and the second end of the resistor R69 is connected to the VCP pin of the single chip computer; MOS tube T12, whose drain D is connected to the second end of the resistor R73, whose gate G is connected to the first end of the resistor R48 and connected to the VINOFF pin of the microcontroller, whose second end is connected to the source S of the MOS tube T12 and connected to the negative power supply GND; A MOS transistor T7, whose gate G is connected to a first end of a resistor R9, whose second end is connected to a VCP pin of a single chip computer, whose source S is connected to a first end of a resistor R42, whose second end is connected to a gate G of the MOS transistor T7; and A transistor T10, an emitter E of which is connected to the source S of the MOS transistor T7 and the source S of the MOS transistor T8, a collector C of the transistor T10 is connected to the first end of the resistor R9, a base B of the transistor T10 is connected to the first end of the resistor R8, and a second end of the resistor R8 is connected to the negative electrode GND of the power supply; Among them, the drain D of the MOS tube T7 is connected to the positive pole PT30_3 of the DC bus of the vehicle-mounted electronic oil pump, the negative pole of the DC bus of the vehicle-mounted electronic oil pump is connected to the negative pole of the power supply GND, and the electrolytic capacitor C23, electrolytic capacitor C24, electrolytic capacitor C25, and electrolytic capacitor C26 are connected in parallel between the positive pole PT30_3 of the DC bus of the vehicle-mounted electronic oil pump and the negative pole of the DC bus of the vehicle-mounted electronic oil pump.

2. The vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit according to claim 1 is characterized in that: Also includes: The capacitor C85 has a first end connected to the gate G of the MOS transistor T8 and a second end connected to the source S of the MOS transistor T8.

3. The vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit according to claim 1 is characterized in that: Also includes: The voltage stabilizing diode D17 has an anode connected to the gate G of the MOS transistor T8 and a cathode connected to the source S of the MOS transistor T8.

4. The vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit according to claim 1 is characterized in that: Also includes: The voltage stabilizing diode D19 has an anode connected to the drain D of the MOS transistor T12 and a cathode connected to the source S of the MOS transistor T12.

5. The vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit according to claim 1 is characterized in that: A diode D14 is further connected between the second end of the resistor R69 and the VCP pin of the single chip computer. The anode of the diode D14 is connected to the VCP pin of the single chip computer, and the cathode of the diode D14 is connected to the second end of the resistor R69.

6. The vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit according to claim 1 is characterized in that: A diode D11 is further connected between the second end of the resistor R9 and the VCP pin of the single chip computer. The anode of the diode D11 is connected to the VCP pin of the single chip computer, and the cathode of the diode D11 is connected to the second end of the resistor R9.

7. The vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit according to claim 1, characterized in that: Also includes: The capacitor C13 has a first end connected to the emitter E of the transistor T10 , and a second end connected to the base B of the transistor T10 .

8. The vehicle-mounted electronic oil pump high-voltage anti-reverse protection circuit according to claim 1 is characterized in that: Also includes: The capacitor C2 has a first end connected to the gate G of the MOS transistor T7 and a second end connected to the source S of the MOS transistor T7.

9. The vehicle-mounted electronic oil pump high-voltage reverse protection method according to claim 1, the method is applicable to the vehicle-mounted electronic oil pump high-voltage reverse protection circuit according to any one of claims 1 to 8, the method comprising: When the power is turned on normally, the input voltage passes through the positive electrode T30_1 of the power supply, flows through the resistor R38, flows from the drain D of the MOS tube T8 through its source S, and then flows from the source S of the MOS tube T7 to its drain D, charging the electrolytic capacitors C23, C24, C25, and C26 at the rear end; In response to the input voltage rising to 6V, the charge pump of the single-chip microcomputer starts to work, and the VCP pin of the single-chip microcomputer generates a VCP voltage higher than the input voltage 12V, turning on the MOS tube T8 and the MOS tube T7, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned on to supply power to the motor three-phase bridge bus of the rear-end vehicle-mounted electronic oil pump; In response to the input voltage being stable at 24V, the MOS tube T7 and the MOS tube T8 are in a conducting state, and the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is turned on to ensure the voltage input during normal operation; In response to the input voltage being greater than 32V, the MOS tube T8 is turned off, and the DC bus positive electrode PT30_3 of the on-board electronic oil pump is turned off; In response to the input voltage being greater than 35V, the VINOFF pin of the single chip microcomputer is set to a high level, the MOS tube T12 is turned on, the MOS tube T8 is turned off, the gate G voltage of the MOS tube T8 is reduced, and the DC bus positive electrode PT30_3 of the on-board electronic oil pump is turned off to avoid damage to the rear-end electronic devices; In response to the input voltage dropping to 32V, the VINOFF pin of the single chip microcomputer is set to a low level, the MOS tube T8 is turned on, and the DC bus positive electrode PT30_3 of the vehicle electronic oil pump is turned on again; The switching state of the DC bus positive electrode PT30_3 of the vehicle-mounted electronic oil pump is repeated in this way to ensure that the voltage value of the rear-end circuit of the MOS tube T8 does not exceed 35V, thereby reducing the withstand voltage level of the rear-end electronic components.

10. The vehicle-mounted electronic oil pump high-pressure reverse protection method according to claim 9, characterized in that: The method further comprises: In response to the voltage reversal, the voltage quickly turns on the transistor T10 through the resistor R8, causing the voltage of the gate G and the drain D of the MOS transistor T7 to drop to 0.7V, thereby turning off the MOS transistor T7 to achieve reverse connection protection.

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