A starting power supply circuit for a new energy vehicle

Abstract

The present invention discloses a starting power supply circuit for a new energy vehicle, comprising: a battery module, a PWM signal generating module, a MOSFET driving circuit module and a supercapacitor module; the supercapacitor module and the battery module are connected in parallel and jointly used to supply power to a load, and a charging switch module is provided between the supercapacitor module and the battery module; the PWM signal generating module is connected to the MOSFET driving circuit module to generate a PWM signal to drive the MOSFET driving circuit module, and the MOSFET driving circuit module is connected to the charging switch module to alternately switch the charging switch module to realize periodic charging of the supercapacitor module by the battery module; the battery module is respectively connected to the MOSFET driving circuit module and the PWM signal generating module for power supply. In the circuit of the present invention, charging of the supercapacitor module can be realized by using all conventional components, with low cost and high reliability. While ensuring the starting power supply effect of the vehicle, the deficiencies in power supply during the start of existing new energy vehicles are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply for new energy vehicles, and in particular to a starting power supply circuit for new energy vehicles. Background Art

[0002] With the implementation of low-carbon life, the industries of electric vehicles and electric motorcycles have also developed rapidly. As a key component of electric vehicles and electric motorcycles, the storage battery has the characteristics of high energy density and low power density, so it does not allow large currents to be instantaneously released frequently, which is contradictory to the requirement of large currents needed when starting the vehicle. Therefore, a super capacitor needs to be used in cooperation. The super capacitor is exactly the opposite of the storage battery in performance. Its energy density is low while its power density is high, and it can instantaneously release hundreds or thousands of amperes of current.

[0003] However, on the market, pre-charge resistors are often used to charge the super capacitor, that is, a high-power resistor is connected in series between the battery and the super capacitor module for current-limiting charging. In this solution, a large amount of power will be consumed on the resistor during charging, resulting in serious heating of the resistor. Although increasing the resistance value of the resistor can reduce the temperature rise, the charging time will be extended, and a better effect cannot be achieved. Moreover, due to the temperature problem during operation, the installation position of the power resistor needs to be considered emphatically, which brings great inconvenience. Summary of the Invention

[0004] In view of the above situation, it is necessary to provide a starting power supply circuit for new energy vehicles to solve the problem that the power supply circuit effect during starting of existing new energy vehicles fails to reach an optimal state.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A starting power supply circuit for new energy vehicles includes: a battery module, a PWM signal generation module, a MOSFET drive circuit module, and a super capacitor module;

[0006] The super capacitor module and the battery module are connected in parallel and are jointly used to supply power to the load. A charging switch module is provided between the super capacitor module and the battery module;

[0007] The PWM signal generation module is connected to the MOSFET drive circuit module to generate a PWM signal to drive the MOSFET drive circuit module. The MOSFET drive circuit module is connected to the charging switch module to make the charging switch module alternately switch to realize periodic charging of the super capacitor module by the battery module;

[0008] The battery module is respectively connected to the MOSFET drive circuit module and the PWM signal generation module for power supply.

[0009] In the starting power supply circuit for new energy vehicles of the present invention, a first power supply module and a second power supply module are further included. The first power supply module and the second power supply module are respectively connected to the battery module to obtain power;

[0010] The first power supply module is connected to the PWM signal generation module for power supply, and the second power supply module is connected to the MOSFET drive circuit module for power supply.

[0011] In the starting power supply circuit of the new energy vehicle of the present invention, the charging switch module includes switch tubes Q8, Q9 and Q10;

[0012] The gates of switch tubes Q8, Q9 and Q10 are connected together and connected to the MOSFET drive circuit module, the drains are connected together and connected to the supercapacitor module, and the sources are connected together and connected to the battery module.

[0013] In the starting power supply circuit of the new energy vehicle of the present invention, the MOSFET drive circuit module includes switch tubes Q4 and Q5;

[0014] The base of switch tube Q5 is connected to the PWM signal generation module, the emitter of switch tube Q5 is grounded, and the collector of switch tube Q5 is connected to the base of switch tube Q4;

[0015] The collector of switch tube Q4 is connected to the output terminal of the second power supply module, and the emitter of switch tube Q4 is respectively connected to the charging switch module and the emitter of switch tube Q5;

[0016] A capacitor C9 is also connected between the emitter of switch tube Q4 and the emitter of switch tube Q5.

[0017] In the starting power supply circuit of the new energy vehicle of the present invention, the PWM signal generation module includes a PWM chip U3 and an oscillation circuit, and the first power supply module is connected to the PWM chip U3 for power supply;

[0018] The oscillation circuit includes a resistor R10, a resistor R11 and a capacitor C6. The two ends of the resistor R10 are respectively connected to the DISCH pin and the VCC pin of the PWM chip U3, the two ends of the resistor R11 are respectively connected to the DISCH pin and the THRES pin of the PWM chip U3, one end of the capacitor C6 is respectively connected to the resistor R11, the THRES pin and the TRIG pin of the PWM chip U3, and the other end is connected to the CONT pin and the GND pin of the PWM chip U3.

[0019] In the starting power supply circuit of the new energy vehicle of the present invention, the supercapacitor module includes a plurality of series-connected supercapacitor monomers, and an equalizing internal resistance is connected in parallel at both ends of each group of supercapacitor monomers.

[0020] In the starting power supply circuit of the new energy vehicle of the present invention, an overvoltage protection control circuit module is further included, and the overvoltage protection control circuit module is respectively connected to the supercapacitor module, the PWM signal generation module and the charging switch module;

[0021] The overvoltage protection control circuit module includes a discharge control circuit and a PWM shutdown circuit. The discharge control circuit is used to control the supercapacitor module to discharge, and the PWM shutdown circuit is used to disconnect the operation of the PWM signal generation module.

[0022] In the starting power supply circuit of the new energy vehicle of the present invention, the discharge control circuit includes an optocoupler P1, a switching transistor Q6 and a switching transistor Q7. The switching transistor Q6 is a PNP triode, and the switching transistor Q7 is an NPN triode;

[0023] The collector of the switching transistor Q7 is connected to the base of the switching transistor Q6. The emitter of the switching transistor Q7 is connected to the input terminal of the second power supply module. The base of the switching transistor Q7 is connected to its emitter through an RC filter module;

[0024] The emitter and base of the switching transistor Q6 are connected and then connected to the output terminal of the second power supply module. The collector of the switching transistor Q6 is connected to the charging switch module.

[0025] The input terminal of the optocoupler P1 is connected to the supercapacitor module. The emitter of the output terminal of the optocoupler P1 is connected to the emitter of the switching transistor Q7, and the collector of the output terminal of the optocoupler P1 is connected to the collector of the switching transistor Q7.

[0026] In the starting power supply circuit of the new energy vehicle of the present invention, the PWM shutdown circuit includes a switching transistor Q1 and a switching transistor Q2;

[0027] The base of the switching transistor Q2 is connected to the collector of the switching transistor Q6. The emitter of the switching transistor Q2 is grounded. The collector of the switching transistor Q2 is connected to the base of the switching transistor Q1;

[0028] The emitter of the switching transistor Q1 is connected to the input terminal of the first power supply module. The collector of the switching transistor Q1 is connected to the battery module. The base of the switching transistor Q1 is connected to its collector.

[0029] In the starting power supply circuit of the new energy vehicle of the present invention, the PWM chip U3 uses an NA555 chip.

[0030] Through the above technical solutions, the present invention has the following beneficial effects:

[0031] 1. The present invention drives the MOSFET drive circuit module through the PWM signal generation module, thereby controlling the alternating switching of the charging switch module to realize the periodic charging of the battery module to the supercapacitor module. At the moment when the new energy vehicle starts, the battery module and the supercapacitor module supply power together. Due to the characteristics of the supercapacitor module, the vast majority of the current is provided by the supercapacitor module. After the vehicle stabilizes, the battery module will charge the supercapacitor module to prepare for the next start of the vehicle;

[0032] 2. In the circuit of the present invention, all conventional components can be used to charge the supercapacitor module, which has low cost and high reliability. While ensuring the power supply effect for vehicle starting, it avoids the power supply deficiency during the start-up of existing new energy vehicles, and greatly improves the overall performance of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the principle block diagram of an embodiment of the present invention;

[0034] Figure 2 is the circuit schematic diagram of an embodiment of the present invention.

[0035] 100. Battery module; 110. First power supply module; 120. Second power supply module; 200. PWM signal generation module; 300. MOSFET drive circuit module; 400. Supercapacitor module; 500. Charging switch module; 600. Overvoltage protection control circuit module; 610. Discharge control circuit; 620. PWM turn-off circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further describes in detail a new energy vehicle starting power supply circuit of the present invention with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] Please refer to Figure 1-2 , a new energy vehicle starting power supply circuit, comprising: a battery module 100, a PWM signal generation module 200, a MOSFET drive circuit module 300 and a supercapacitor module 400;

[0039] The supercapacitor module 400 and the battery module 100 are connected in parallel and jointly used to supply power to the load. A charging switch module 500 is provided between the supercapacitor module 400 and the battery module 100; the PWM signal generation module 200 is connected to the MOSFET drive circuit module 300 to generate a PWM signal to drive the MOSFET drive circuit module 300. The MOSFET drive circuit module 300 is connected to the charging switch module 500, enabling the charging switch module 500 to switch alternately to achieve periodic charging of the supercapacitor module 400 by the battery module 100. It can be understood that the PWM (Pulse Width Modulation) signal is a pulse signal composed of a fixed period and a variable duty cycle. By changing the duty cycle, the PWM signal can adjust the magnitude of the output voltage or current, thereby driving the MOSFET drive circuit module 300.

[0040] The battery module 100 is respectively connected to the MOSFET drive circuit module 300 and the PWM signal generation module 200 for power supply. Specifically, the battery module 100 in the present invention refers to a low-voltage storage battery module used to supply power to the system control. There is also a high-voltage storage battery inside the new energy vehicle, and the high-voltage electricity is converted into low-voltage electricity through a voltage converter to supply the low-voltage storage battery.

[0041] In the present invention, the PWM signal generation module 200 drives the MOSFET drive circuit module 300, thereby controlling the alternating switching of the charging switch module 500 to achieve periodic charging of the supercapacitor module 400 by the battery module 100. At the moment when the new energy vehicle starts, the battery module 100 and the supercapacitor module 400 supply power together. Due to the characteristics of the supercapacitor module 400, the vast majority of the current is provided by the supercapacitor module 400. After the vehicle stabilizes, the battery module 100 will charge the supercapacitor module 400 to prepare for the next start of the vehicle.

[0042] In this embodiment, it further includes a first power supply module 110 and a second power supply module 120. The first power supply module 110 and the second power supply module 120 are respectively connected to the battery module 100 to obtain power. The first power supply module 110 and the second power supply module 120 are used to raise or lower the voltage of the battery module 100 to match the voltages required by the electronic components in the PWM signal generation module 200 and the MOSFET drive circuit module 300. The first power supply module 110 is connected to the PWM signal generation module 200 for power supply, and the second power supply module 120 is connected to the MOSFET drive circuit module 300 for power supply. Preferably, the first power supply module 110 and the second power supply module 120 adopt the WR0515 chip. The WR0515 is a high-efficiency and low-cost DC-DC buck converter chip with ultra-low quiescent current, which can significantly reduce energy waste and heat loss and improve the overall performance. Preferably, capacitors are provided between the input and output terminals of the first power supply module 110 and the second power supply module 120 and the ground terminal, as shown by capacitors C7, C8, C2, and C3 in the figure, which can play a filtering role to filter out some high-frequency noises and make the input and output voltages more stable.

[0043] In this embodiment, the charging switch module 500 includes a switching transistor Q8, a switching transistor Q9, and a switching transistor Q10. The gates of the switching transistor Q8, the switching transistor Q9, and the switching transistor Q10 are connected together and connected to the MOSFET drive circuit module 300. The drains are connected together and connected to the supercapacitor module 400. The sources are connected together and connected to the battery module 100. As shown in the figure, a voltage regulator diode Z1 is further provided in the charging switch module 500, which plays a role in protecting the MOSFET gate from being broken down by an instantaneously excessive voltage. By alternately switching the charging switch module 500, the battery module 100 can periodically charge the supercapacitor module 400.

[0044] In this embodiment, the MOSFET drive circuit module 300 includes a switching transistor Q4 and a switching transistor Q5. The base of the switching transistor Q5 is connected to the PWM signal generation module 200. The emitter of the switching transistor Q5 is grounded. The collector of the switching transistor Q5 is connected to the base of the switching transistor Q4. The collector of the switching transistor Q4 is connected to the output terminal of the second power supply module 120. The emitter of the switching transistor Q4 is respectively connected to the charging switch module 500 and the emitter of the switching transistor Q5. A capacitor C9 is also connected between the emitter of the switching transistor Q4 and the emitter of the switching transistor Q5, and the capacitor C9 can play a filtering role. It can be understood that several resistors are connected to the switching transistor Q4 and the switching transistor Q5, such as resistors R13, R14, R15, R16, etc. in the figure, which can play roles such as providing voltage bias for the triode and current limiting protection.

[0045] The PWM signal generation module 200 generates a low-frequency and small-duty-cycle PWM signal to drive the switching transistor Q5, causing the switching transistor Q4 to output an inverted power PWM signal to drive the charging switch module 500 to operate. Specifically, when the PWM signal generation module 200 outputs a high level to drive the switching transistor Q5 to conduct, the switching transistor Q4 is cut off. Therefore, the emitter of the switching transistor Q4 outputs a low level, and the charging switch module 500 is in an off state; when the PWM signal generation module 200 outputs a low level to drive the switching transistor Q5 to cut off, the switching transistor Q4 conducts. Therefore, the emitter of the switching transistor Q4 outputs a high level, and the charging switch module 500 is in an on state, thereby realizing the periodic charging of the supercapacitor module 400 by the battery module 100.

[0046] In this embodiment, the PWM signal generation module 200 includes a PWM chip U3 and an oscillation circuit, and the first power supply module 110 is connected to the PWM chip U3 for power supply. Specifically, the PWM chip U3 can generate corresponding high and low level signals to control the operating states of the switching transistors Q4 and Q5 in the MOSFET drive circuit module 300, thereby realizing the control of the switch of the charging switch module 500.

[0047] The oscillation circuit includes a resistor R10, a resistor R11, and a capacitor C6. The two ends of the resistor R10 are respectively connected to the DISCH pin and the VCC pin of the PWM chip U3. The two ends of the resistor R11 are respectively connected to the DISCH pin and the THRES pin of the PWM chip U3. One end of the capacitor C6 is respectively connected to the resistor R11, the THRES pin of the PWM chip U3, and the TRIG pin, and the other end is connected to the CONT pin and the GND pin of the PWM chip U3. Connect the trigger input to the threshold input to make the timer self-trigger and operate as a multivibrator. The resistors R10 and R11 charge the capacitor C6, and the capacitor C6 discharges through the resistor R11. Therefore, the entire cycle is controlled by R10, R11, and C6.

[0048] In this embodiment, the supercapacitor module 400 includes a plurality of series-connected supercapacitor monomers, and an equalizing internal resistance is connected in parallel at both ends of each group of supercapacitor monomers. Preferably, the rated voltage of the battery module 100 is 24 Vdc, and the maximum charged voltage is 28 Vdc. There are twelve supercapacitor monomers, as shown as UC1 - UC12 in the figure. The rated parameters are 2.7 V, and the typical internal resistance is ≤1.4 mΩ. Therefore, the total rated withstand voltage of twelve series-connected supercapacitor monomers is 2.7 V * 12 = 32.4 V, which is greater than the maximum voltage of the battery, 28 V.

[0049] In this embodiment, it further includes an overvoltage protection control circuit module 600, and the overvoltage protection control circuit module 600 is respectively connected to the supercapacitor module 400, the PWM signal generation module 200, and the charging switch module 500;

[0050] The overvoltage protection control circuit module 600 includes a discharge control circuit 610 and a PWM turn-off circuit 620. The discharge control circuit 610 is used to control the supercapacitor module 400 to discharge. By controlling the charging switch module 500, its voltage discharges to the voltage level of the battery module 100 in a short time, avoiding damage caused by excessive voltage. The PWM turn-off circuit 620 is used to disconnect the operation of the PWM signal generation module, so that the PWM drive signal will not be output to drive the charging switch module 500, resulting in a working logic error.

[0051] Further, in this embodiment, the discharge control circuit 610 includes an optocoupler P1, a switching transistor Q6, and a switching transistor Q7. The switching transistor Q6 is a PNP triode, and the switching transistor Q7 is an NPN triode;

[0052] The collector of the switching transistor Q7 is connected to the base of the switching transistor Q6. The emitter of the switching transistor Q7 is connected to the input terminal of the second power supply module 120. The base of the switching transistor Q7 is connected to its emitter through an RC filtering module. After the emitter and the base of the switching transistor Q6 are connected, they are connected to the output terminal of the second power supply module 120. The collector of the switching transistor Q6 is connected to the charging switch module 500. The input terminal of the optocoupler P1 is connected to the supercapacitor module 400. The emitter of the output terminal of the optocoupler P1 is connected to the emitter of the switching transistor Q7, and the collector of the output terminal of the optocoupler P1 is connected to the collector of the switching transistor Q7. As shown in the figure, the discharge control circuit 610 also includes a TL431 chip and its peripheral components such as a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a resistor R4 to realize overvoltage detection;

[0053] Specifically, when the supercapacitor module 400 is overvoltage, the output terminal of the optocoupler P1 conducts, causing the voltage between the collector and the emitter of the switching transistor Q7 to be pulled down, thus causing the switching transistor Q6 to work and output a high level to drive the charging switch module 500 to conduct, so that the voltage on the supercapacitor module 400 discharges to the voltage level of the battery module 100 in a short time, thereby protecting the supercapacitor module 400 from being damaged due to overvoltage.

[0054] In this embodiment, the PWM turn-off circuit 620 includes a switching transistor Q1 and a switching transistor Q2; the base of the switching transistor Q2 is connected to the collector of the switching transistor Q6, the emitter of the switching transistor Q2 is grounded, and the collector of the switching transistor Q2 is connected to the base of the switching transistor Q1; the emitter of the switching transistor Q1 is connected to the input terminal of the first power supply module 110, the collector of the switching transistor Q1 is connected to the battery module, and the base of the switching transistor Q1 is connected to the collector. When the supercapacitor module 400 is overvoltage, the switching transistor Q6 works to output a high level, which causes the switching transistor Q2 to conduct, pulls down the base voltage of the switching transistor Q1, and makes the switching transistor Q1 cut off. Therefore, the first power supply module 110 cannot work, and the PWM signal generation module 200 cannot work to output a PWM drive signal to drive the charging switch module 500, avoiding the problem of logical errors caused by the simultaneous operation of the discharge control circuit 610 and the PWM turn-off circuit 620.

[0055] Preferably, in this embodiment, the PWM chip U3 uses an NA555 chip. The NA555 chip has stable operation, strong anti-interference ability, is not easily affected by external interference, and its cost is very low, and various signal generation requirements can be realized with less cost. Of course, other PWM chips can also be used according to needs, and the specific model of the PWM chip U3 is not limited here.

[0056] In summary, the present invention provides a power supply circuit for starting a new energy vehicle, including: a battery module 100, a PWM signal generation module 200, a MOSFET drive circuit module 300, and a supercapacitor module 400;

[0057] The supercapacitor module 400 and the battery module 100 are connected in parallel and jointly used to supply power to the load. A charging switch module 500 is provided between the supercapacitor module 400 and the battery module 100; the PWM signal generation module 200 is connected to the MOSFET drive circuit module 300 to generate a PWM signal to drive the MOSFET drive circuit module 300, and the MOSFET drive circuit module 300 is connected to the charging switch module 500, so that the charging switch module 500 alternately switches to realize the periodic charging of the battery module 100 to the supercapacitor module 400.

[0058] Specifically, when the PWM signal generation module 200 outputs a high level to drive the switching transistor Q5 to conduct, the switching transistor Q4 is cut off. Therefore, the emitter of the switching transistor Q4 outputs a low level, and the charging switch module 500 is in the off state; when the PWM signal generation module 200 outputs a low level to drive the switching transistor Q5 to cut off, the switching transistor Q4 conducts. Therefore, the emitter of the switching transistor Q4 outputs a high level, and the charging switch module 500 is in the on state. The charging switch module 500 alternately switches continuously, thereby realizing the periodic charging of the battery module 100 to the supercapacitor module 400.

[0059] Where the present invention is not described in detail, it is the well-known technology of those skilled in the art.

[0060] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A starting power supply circuit for a new energy vehicle, characterized in that, it includes: a battery module (100), a PWM signal generation module (200), a MOSFET drive circuit module (300), and a supercapacitor module (400); the supercapacitor module (400) and the battery module (100) are connected in parallel and are jointly used to supply power to a load. A charging switch module (500) is provided between the connection of the supercapacitor module (400) and the battery module (100); the PWM signal generation module (200) is connected to the MOSFET drive circuit module (300) to generate a PWM signal to drive the MOSFET drive circuit module (300). The MOSFET drive circuit module (300) is connected to the charging switch module (500) to make the charging switch module (500) alternately switch to realize the periodic charging of the battery module (100) to the supercapacitor module (400); the battery module (100) is respectively connected to the MOSFET drive circuit module (300) and the PWM signal generation module (200) for power supply; it further includes a first power supply module (110) and a second power supply module (120). The first power supply module (110) and the second power supply module (120) are respectively connected to the battery module (100) to obtain power; the first power supply module (110) is connected to the PWM signal generation module (200) for power supply, and the second power supply module (120) is connected to the MOSFET drive circuit module (300) for power supply; the MOSFET drive circuit module (300) includes a switching transistor Q4 and a switching transistor Q5; the base of the switching transistor Q5 is connected to the PWM signal generation module. The emitter of the switching transistor Q5 is grounded, and the collector of the switching transistor Q5 is connected to the base of the switching transistor Q4; the collector of the switching transistor Q4 is connected to the output terminal of the second power supply module (120). The emitter of the switching transistor Q4 is respectively connected to the charging switch module (500) and the emitter of the switching transistor Q5; a capacitor C9 is further connected between the emitter of the switching transistor Q4 and the emitter of the switching transistor Q5; it further includes an overvoltage protection control circuit module (600). The overvoltage protection control circuit module (600) is respectively connected to the supercapacitor module (400), the PWM signal generation module (200), and the charging switch module (500); the overvoltage protection control circuit module (600) includes a discharge control circuit (610) and a PWM turn-off circuit (620). The discharge control circuit (610) is used to control the discharge of the supercapacitor module (400), and the PWM turn-off circuit (620) is used to disconnect the operation of the PWM signal generation module (200); The discharge control circuit (610) includes an optocoupler P1, a switching transistor Q6, and a switching transistor Q7. The switching transistor Q6 is a PNP triode, and the switching transistor Q7 is an NPN triode; The collector of the switching transistor Q7 is connected to the base of the switching transistor Q6. The emitter of the switching transistor Q7 is connected to the input terminal of the second power supply module (120). The base of the switching transistor Q7 is connected to its emitter through an RC filtering module; The emitter and the base of the switching transistor Q6 are connected and then connected to the output terminal of the second power supply module (120). The collector of the switching transistor Q6 is connected to the charging switch module (500); The input terminal of the optocoupler P1 is connected to the supercapacitor module (400). The emitter of the output terminal of the optocoupler P1 is connected to the emitter of the switching transistor Q7, and the collector of the output terminal of the optocoupler P1 is connected to the collector of the switching transistor Q7; The PWM turn-off circuit (620) includes a switching transistor Q1 and a switching transistor Q2; The base of the switching transistor Q2 is connected to the collector of the switching transistor Q6. The emitter of the switching transistor Q2 is grounded. The collector of the switching transistor Q2 is connected to the base of the switching transistor Q1; The emitter of the switching transistor Q1 is connected to the input terminal of the first power supply module (110). The collector of the switching transistor Q1 is connected to the battery module (100). The base and the collector of the switching transistor Q1 are connected; 2. The starting power supply circuit for a new energy vehicle according to claim 1, characterized in that, The charging switch module (500) includes a switching transistor Q8, a switching transistor Q9, and a switching transistor Q10; The gates of the switching transistor Q8, the switching transistor Q9, and the switching transistor Q10 are connected together and connected to the MOSFET driving circuit module (300). The drains are connected together and connected to the supercapacitor module (400). The sources are connected together and connected to the battery module (100).

3. The starting power supply circuit for a new energy vehicle according to claim 1, characterized in that, The PWM signal generating module (200) includes a PWM chip U3 and an oscillation circuit. The first power supply module (110) is connected to the PWM chip U3 for power supply; The oscillation circuit includes a resistor R10, a resistor R11, and a capacitor C6. The two ends of the resistor R10 are respectively connected to the DISCH pin and the VCC pin of the PWM chip U3. The two ends of the resistor R11 are respectively connected to the DISCH pin and the THRES pin of the PWM chip U3. One end of the capacitor C6 is respectively connected to the resistor R11, the THRES pin of the PWM chip U3, and the TRIG pin, and the other end is connected to the CONT pin and the GND pin of the PWM chip U3.

4. The starting power supply circuit for a new energy vehicle according to claim 1, characterized in that, The supercapacitor module (400) includes a plurality of series-connected supercapacitor monomers, and an equalizing internal resistance is connected in parallel at both ends of each group of supercapacitor monomers.

5. A starting power supply circuit for a new energy vehicle according to claim 3, characterized in that, the PWM chip U3 uses an NA555 chip.

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