A flap drive protection circuit

Abstract

The embodiment of the present application provides a flap drive protection circuit, comprising: a drive circuit; a drive power supply; a reverse electromotive force discharge circuit, used for discharging the reverse electromotive force of the drive circuit when the reverse electromotive force of the drive circuit generated by the drive circuit driving the motor is greater than a preset discharge voltage threshold; an overvoltage monitoring circuit, used for detecting whether the voltage of the drive power supply exceeds a preset threshold voltage, and outputting the detection result to a comparison circuit; a current acquisition circuit, used for acquiring the current of the drive circuit; an overcurrent monitoring circuit, used for detecting whether the current of the drive circuit exceeds a preset threshold current, and outputting the detection result to the comparison circuit; and the comparison circuit, used for turning off the drive power supply when the voltage of the drive power supply exceeds the preset threshold voltage and / or the current of the drive circuit exceeds the preset threshold current. The purpose is to prevent damage to the drive circuit caused by the accumulation of the reverse electromotive force, the overvoltage of the drive power supply or the overcurrent of the drive circuit.

Description

Technical Field

[0001] This invention relates to the field of aircraft flap control system drive circuit technology, and particularly to a flap drive protection circuit. Background Technology

[0002] Flaps are used to increase lift during takeoff and drag during landing. The flap control system drives the flaps to retract and extend. Traditional flap actuators use hydraulic actuation, but with the development of electric drive technology in recent years, electric drive has gradually replaced hydraulic drive, especially in all-electric aircraft and drones. Due to the influence of the flap's own weight and aerodynamic forces, the flap control system may experience motor overload (motor movement direction is the same as the load direction) during operation. Under this condition, the motor enters generator mode, and the back electromotive force generated by the motor may damage the drive circuit, leading to loss of control of the flap system, affecting aircraft takeoff and landing, and even flight safety. Therefore, effective protection of the drive circuit is essential. Currently, a common method for protecting against motor overload is to add a large capacitor between the drive power supply and ground to discharge the back electromotive force. This discharge circuit has high requirements for capacitor capacity and voltage withstand, increasing the cost, weight, and size of the drive circuit. In addition, because the capacitor capacity varies greatly with the environment, this circuit cannot achieve precise discharge. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a flap drive protection circuit to prevent damage to the drive circuit caused by back electromotive force accumulation, drive power supply overvoltage or drive circuit overcurrent.

[0004] The embodiments in this specification provide the following technical solutions:

[0005] A flap drive protection circuit includes: Drive circuit, used to drive the motor; A driver power supply is used to provide power to the driver circuit. The reverse electromotive force discharge circuit is connected in parallel with the drive circuit and is used to discharge the reverse electromotive force of the drive circuit when the reverse electromotive force generated by the drive circuit driving the motor is greater than the preset discharge voltage threshold. The overvoltage monitoring circuit has its input terminal connected to the drive power supply and its output terminal connected to the input terminal of the comparator circuit. It is used to detect whether the voltage of the drive power supply exceeds the preset threshold voltage and output the detection result to the comparator circuit. The current acquisition circuit has its input terminals connected to the output terminals of the drive power supply and the comparator circuit, respectively, and its output terminals connected to the input terminals of the drive circuit and the overcurrent monitoring circuit, respectively, for acquiring the current of the drive circuit. The overcurrent monitoring circuit has its output connected to the input of the comparator circuit. It is used to detect whether the current of the drive circuit exceeds the preset threshold current and outputs the detection result to the comparator circuit. The comparator circuit is used to turn off the drive power supply when the voltage of the drive power supply exceeds a preset threshold voltage and / or the current of the drive circuit exceeds a preset threshold current.

[0006] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least: By employing a low-cost, lightweight, precise, and comprehensive flap drive protection circuit, damage to the drive circuit caused by back electromotive force accumulation, drive power supply overvoltage, or drive circuit overcurrent is prevented. This provides precise and comprehensive protection for the flap drive circuit, avoiding the impact on aircraft takeoff and landing and flight safety due to loss of control of the flap control system. Attached Figure Description

[0007] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the overall structure of the flap drive protection circuit according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the reverse electromotive force discharge circuit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the overvoltage monitoring circuit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the current acquisition circuit and overcurrent monitoring circuit according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the existing flap drive protection circuit. Detailed Implementation

[0009] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0010] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0011] like Figure 5 As shown, the existing bleeder circuits commonly use the following methods for protecting motors against overload: A large capacitor is added between the drive power supply and ground to discharge the reverse electromotive force. This discharge circuit has high requirements for the capacitance and voltage rating of the capacitor, which increases the cost, weight and size of the drive circuit. In addition, since the capacitance varies greatly with the environment, this circuit cannot achieve precise discharge.

[0012] In this embodiment of the invention, a flap protection circuit is provided for protecting a drive circuit, wherein the drive circuit is used to drive a motor. For example... Figure 1 As shown, the flap protection circuit includes a drive power supply, a reverse electromotive force discharge circuit, an overvoltage monitoring circuit, a current acquisition circuit, an overcurrent monitoring circuit, and a comparison circuit.

[0013] A driver power supply is used to provide power to the driver circuit.

[0014] The reverse electromotive force discharge circuit, connected in parallel with the drive circuit, is used to discharge the reverse electromotive force of the drive circuit when the reverse electromotive force generated by the drive circuit driving the motor is greater than the preset discharge voltage threshold.

[0015] The overvoltage monitoring circuit has its input terminal connected to the drive power supply and its output terminal connected to the input terminal of the comparator circuit. It is used to detect whether the voltage of the drive power supply exceeds the preset threshold voltage and output the detection result to the comparator circuit. The current acquisition circuit has its input terminals connected to the output terminals of the drive power supply and the comparator circuit, respectively, and its output terminals connected to the input terminals of the drive circuit and the overcurrent monitoring circuit, respectively, for acquiring the current of the drive circuit. The overcurrent monitoring circuit has its output connected to the input of the comparator circuit. It is used to detect whether the current of the drive circuit exceeds the preset threshold current and outputs the detection result to the comparator circuit. A comparator circuit is used to turn off the drive power supply when the voltage of the drive power supply exceeds a preset threshold voltage and / or the current of the drive circuit exceeds a preset threshold current. The comparator circuit includes an AND gate U1, a transistor Q2, a resistor-based field-effect transistor Q1, and a reverse suppression diode D1.

[0016] The input terminals of AND gate U1 are connected to the output terminals of the overvoltage monitoring circuit and the overcurrent monitoring circuit, respectively. The output terminal of AND gate U1 is connected to the base of transistor Q2 through a resistor assembly. The collector of transistor Q2 is connected to the input terminal of the current acquisition circuit through field-effect transistor Q1 and the resistor assembly. The emitter of transistor Q2 is connected to the resistor assembly. One end of the reverse suppression diode D1 is connected to the drive power supply, and the other end of the reverse suppression diode D1 is connected to the input terminal of the current acquisition circuit, the first resistor R1, and the field-effect transistor Q1, respectively.

[0017] The resistor assembly includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and an intermediate capacitor C1. In the comparator circuit, the base of transistor Q2 is connected to the output of AND gate U1 through the third resistor R3. The emitter of transistor Q2 is connected to the base of transistor Q2 through the fourth resistor R4 and the intermediate capacitor C1. The fourth resistor R4 and the intermediate capacitor C1 are connected in parallel. The collector of transistor Q2 is connected to the first resistor R1 and the field-effect transistor Q1 through the second resistor R2. The first resistor R1 and the field-effect transistor Q1 are connected in parallel. The first resistor R1 is connected to the second resistor R2, the field-effect transistor Q1, and the current acquisition circuit.

[0018] Depend on Figure 1 As shown in the circuit diagram, in this embodiment of the invention, the reverse electromotive force (EMF) discharge circuit is used to discharge the reverse EMF generated by the motor drive, preventing the back EMF from accumulating too high and damaging the drive circuit. When the high-side power supply voltage of the circuit is greater than the discharge threshold of the drive circuit, the discharge circuit is turned on, and the reverse EMF is quickly discharged through the discharge resistor, thereby achieving the function of protecting the drive circuit.

[0019] like Figure 2 As shown, in this embodiment of the invention, the reverse electromotive force discharge circuit includes: Eleventh comparator U11, drive power input terminal, three DC +5V voltage input terminals P5V, DC +15V voltage input terminal P15V, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, sixteenth resistor R16, seventeenth resistor R17, eighteenth resistor R18, nineteenth resistor R19, tenth resistor R10, ground terminal GND, eleventh intermediate capacitor C11, twelfth intermediate capacitor C12, first reverse suppression diode D11, eleventh transistor Q11 and twelfth field-effect transistor Q12.

[0020] The drive power input terminal is connected to one end of the eleventh resistor R11. The positive input terminal of the eleventh comparator U11 is connected to the other end of the eleventh resistor R11 and one end of the twelfth resistor R12. The negative input terminal of the eleventh comparator U11 is connected to one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14. The power supply terminal of the eleventh comparator U11 is connected to the DC +5V voltage input terminal P5V. The other end of the thirteenth resistor R13 is connected to the DC +5V voltage input terminal P5V. The ground terminal of the eleventh comparator U11, the other end of the twelfth resistor R12, and the other end of the fourteenth resistor R14 are all connected to the ground terminal GND. The DC +5V voltage input terminal P5V is connected to one end of the fifteenth resistor R15. The other end of the fifteenth resistor R15 is connected to the eleventh... The output of comparator U11 is connected to one end of the sixteenth resistor R16. The DC +15V voltage input terminal P15V is connected to the collector of the eleventh transistor Q11 through the seventeenth resistor R17 and the first reverse suppression diode D11. The seventeenth resistor R17 and the first reverse suppression diode D11 are connected in parallel. The base of the eleventh transistor Q11 is connected to the other end of the sixteenth resistor R16, the eighteenth resistor R18, and the eleventh intermediate capacitor C11. The eighteenth resistor R18 is connected in parallel with the eleventh intermediate capacitor C11. The emitter of the eleventh transistor Q11 is connected to the nineteenth resistor R19, the twelfth intermediate capacitor C12, and the twelfth field-effect transistor Q12. The nineteenth resistor R19 is connected in parallel with the twelfth intermediate capacitor C12. The tenth resistor R10 is connected to the twelfth field-effect transistor Q12.

[0021] In the reverse electromotive force discharge circuit, the input voltage at the positive input terminal of the eleventh comparator U11 is the voltage across the twelfth resistor R12, the input voltage at the negative input terminal of the eleventh comparator U11 is the voltage across the fourteenth resistor R14, the base voltage of the eleventh transistor Q11 is the voltage across the eighteenth resistor R18 or the voltage across the eleventh intermediate capacitor C11, and the collector voltage of the eleventh transistor Q11 is the difference between the DC +5V voltage input terminal P15V and the voltage across the seventeenth resistor R17.

[0022] When the drive circuit is working normally, the high-side voltage V of the drive circuit H Below the discharge threshold V XT (V) XT (lower than the maximum operating voltage of the drive circuit) Figure 2 In the reverse electromotive force (EMF) bleedering circuit, the positive input voltage of the eleventh comparator U11 is less than the negative input voltage, so the comparator output is low. The eleventh transistor Q11 is cut off, and the twelfth MOSFET Q12 is open-circuited to ground. There is no current flowing through the bleedering resistor R10, and the bleedering circuit is not activated. When the drive motor in the drive circuit operates under load, due to the reverse EMF, the high-side voltage VH of the drive circuit continuously increases.H Greater than the discharge threshold V XT hour, Figure 3 In the circuit, the positive input voltage of the eleventh comparator U11 is greater than the negative input voltage, so the comparator output is high. The eleventh transistor Q11 is turned on, and the twelfth field-effect transistor Q12 is turned on to ground. The reverse electromotive force is quickly discharged to ground through the bleed resistor R10. The bleed threshold of this circuit can be adjusted by adjusting the resistance values ​​of the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, and the fourteenth resistor R14, according to the voltage withstand capability of the fixed drive circuit. The advantage of this reverse electromotive force bleed circuit is that the bleed resistor does not work during normal operation, which reduces the power consumption of the drive power supply during normal operation.

[0023] like Figure 3 As shown, the overvoltage monitoring circuit is used to monitor whether the drive power supply voltage exceeds its normal operating threshold. The overvoltage monitoring circuit includes: a 21st comparator U21, a drive power supply high-side input terminal, three DC +5V voltage input terminals P5V, a 21st resistor R21, a 22nd resistor R22, a 23rd resistor R23, a 24th resistor R24, a 25th resistor R25, and a ground terminal GND.

[0024] The power supply terminal of the 21st comparator U21 is connected to the DC +5V voltage input terminal P5V. The positive input terminal of the 21st comparator U21 is connected to one end of the 21st resistor R21 and one end of the 22nd resistor R22. The other end of the 21st resistor R21 is connected to the DC +5V voltage input terminal P5V. The negative input terminal of the 21st comparator U21 is connected to one end of the 23rd resistor R23 and one end of the 24th resistor R24. The high-side input terminal of the drive power supply is connected to the other end of the 23rd resistor R23. The other end of the 23rd resistor R23 is the input terminal of the overvoltage monitoring circuit. The output terminal of the 21st comparator U21 is connected to the DC +5V voltage input terminal P5V through the 25th resistor R25. The intersection of the output terminal of the 21st comparator U21 and the 25th resistor R25 is the output terminal of the overvoltage monitoring circuit. The ground terminal of the 21st comparator U21, the other end of the 22nd resistor R22, and the other end of the 24th resistor R24 ​​are all connected to the ground terminal GND.

[0025] In the overvoltage monitoring circuit, the input voltage of the positive input terminal of the twenty-first comparator U21 is the voltage across the twenty-second resistor R22, and the input voltage of the negative input terminal of the twenty-first comparator U21 is the voltage across the twenty-fourth resistor R24.

[0026] like Figure 4As shown, the current acquisition circuit and overcurrent monitoring circuit are used to acquire and monitor whether the drive current exceeds its normal operating threshold. The current acquisition circuit and overcurrent monitoring circuit consist of a current acquisition circuit and an overcurrent monitoring circuit, including: a 31st current sensor U31, a 32nd comparator U32, three DC +5V voltage input terminals P5V, a 31st intermediate capacitor C31, a ground terminal GND, a current acquisition input terminal, a current acquisition output terminal, a current monitoring output terminal, an output voltage V1 terminal, a 31st resistor R31, a 32nd resistor R32, a 33rd resistor R33, and a 34th resistor R34.

[0027] In the current acquisition circuit, the 31st current sensor U31 is connected to the DC +5V voltage input terminal P5V, the 31st intermediate capacitor C31, and the ground terminal GND. Terminals 1 and 2 of the 31st current sensor U31 serve as the current acquisition input terminals of the current acquisition circuit, and terminals 3 and 4 of the 31st current sensor U31 serve as the current acquisition output terminals of the current acquisition circuit. The output voltage V1 terminal of the 31st current sensor U31 is connected to one end of the 31st resistor R31 in the overcurrent monitoring circuit, and the two ends of the 31st intermediate capacitor C31 are connected to the DC +5V voltage input terminal P5V and the ground terminal GND, respectively. In the overcurrent monitoring circuit, the DC +5V voltage input terminal P5V is connected to the power supply terminal of the 32nd comparator U32. The negative input terminal of the 32nd comparator U32 is connected to the other end of the 31st resistor R31. One end of the 31st resistor R31 is the input terminal of the overcurrent monitoring circuit. The positive input terminal of the 32nd comparator U32 is connected to the DC +5V voltage input terminal P5V through the 32nd resistor R32. The positive input terminal of the 32nd comparator U32 is connected to one end of the 33rd resistor R33. The output terminal of the 32nd comparator U32 is connected to the DC +5V voltage input terminal P5V through the 34th resistor R34. The intersection of the output terminal of the 32nd comparator U32 and the 34th resistor R34 is the output terminal of the overcurrent monitoring circuit. The ground terminal of the 32nd comparator U32 and the other end of the 33rd resistor R33 are both connected to the ground terminal GND.

[0028] In the current acquisition circuit and overcurrent monitoring circuit, the input voltage at the positive input terminal of the thirty-second comparator U32 is the output voltage of the thirty-first resistor R31, and the input voltage at the negative input terminal of the thirty-second comparator U32 is the voltage across the thirty-third resistor R33.

[0029] In use, the overvoltage monitoring circuit monitors whether the drive power supply voltage exceeds its normal operating threshold. When the drive power supply voltage is lower than the maximum allowable operating voltage of the drive circuit, Figure 3In the overvoltage monitoring circuit, the positive input voltage of the 21st comparator U21 is greater than the negative input voltage, so the output of the 21st comparator U21 (overvoltage monitoring output) is high. The drive current acquisition and overcurrent monitoring circuit is used to acquire and monitor whether the drive current exceeds its normal operating threshold. When the drive circuit current is lower than the maximum allowable operating current of the drive circuit, Figure 4 When the output voltage V1 of the thirty-first current sensor U31 in the drive current acquisition and overcurrent monitoring circuit is less than the monitoring threshold V2, the positive input voltage of the thirty-second comparator U32 in the drive current acquisition and overcurrent monitoring circuit is greater than the negative input voltage, and the comparator output (overcurrent monitoring output) of the drive current acquisition and overcurrent monitoring circuit is high. Figure 1 The driving voltage and driving current are both within the allowable range of the driving circuit, that is... Figure 2 Since all inputs to the AND gate U1 in the reverse electromotive force (EMF) discharge circuit are high, the output of the AND gate U1 in the reverse EMF discharge circuit is also high. Figure 1 When transistor Q2 in the comparator circuit is turned on, it in turn turns on the field-effect transistor Q1 in the comparator circuit, and the drive power supply is powered normally. When either the drive power supply voltage or the drive circuit current exceeds the allowable range of the drive circuit, i.e., when the overvoltage monitoring output or the overcurrent monitoring output is low, Figure 1 The AND gate U1 of the reverse electromotive force discharge circuit outputs a low level. Figure 1 When the transistor Q2 in the reverse electromotive force discharge circuit is turned off, the field-effect transistor Q1 in the reverse electromotive force discharge circuit is also turned off, cutting off the drive power supply, thereby achieving the purpose of protecting the drive circuit from damage due to overvoltage or overcurrent.

[0030] The working principle of the flap drive protection circuit is as follows: It collects the high-end voltage of the drive circuit. When the back electromotive force of the drive circuit accumulates and the high-end voltage of the drive circuit exceeds the discharge threshold, it uses a comparator circuit to connect the discharge circuit, thereby achieving accurate discharge of the back electromotive force and preventing damage to the drive circuit caused by the accumulation of back electromotive force. It also collects the drive power supply voltage and drive circuit current. When the drive power supply voltage or drive circuit is overcurrent, it uses a comparator circuit to turn off the drive power supply, thereby preventing damage to the drive circuit caused by overvoltage of the drive power supply or overcurrent of the drive circuit.

[0031] The embodiments of the present invention achieve the following technical effects: This invention employs a low-cost, lightweight, precise, and comprehensive flap drive protection circuit to prevent damage to the drive circuit caused by back electromotive force accumulation, drive power supply overvoltage, or drive circuit overcurrent. It provides precise and comprehensive protection for the flap drive circuit, preventing the flap control system from malfunctioning and affecting aircraft takeoff and landing and flight safety. By collecting drive voltage and current data and setting comparison monitoring thresholds based on the internal circuit's withstand capabilities, precise protection is achieved. This improves protection accuracy, reduces power consumption, and lowers cost and weight compared to previous large capacitor discharge methods, while also improving circuit reliability. It is particularly suitable for flap control systems operating under continuous load for extended periods.

[0032] Obviously, those skilled in the art should understand that the modules or steps of the above-described embodiments of the present invention can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the embodiments of the present invention are not limited to any particular hardware and software combination.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flap drive protection circuit, characterized in that, include: Drive circuit, used to drive the motor; A driving power supply is used to provide power to the driving circuit. A reverse electromotive force discharge circuit, connected in parallel with the drive circuit, is used to discharge the reverse electromotive force of the drive circuit when the reverse electromotive force generated by the drive circuit driving the motor is greater than a preset discharge voltage threshold. An overvoltage monitoring circuit is provided, wherein the input terminal of the overvoltage monitoring circuit is connected to the driving power supply, and the output terminal of the overvoltage monitoring circuit is connected to the input terminal of the comparison circuit. The circuit is used to detect whether the voltage of the driving power supply exceeds a preset threshold voltage and output the detection result to the comparison circuit. A current acquisition circuit is provided, wherein the input terminal of the current acquisition circuit is connected to the output terminal of the driving power supply and the comparator circuit respectively, and the output terminal of the current acquisition circuit is connected to the input terminal of the driving circuit and the overcurrent monitoring circuit respectively, for acquiring the current of the driving circuit. The overcurrent monitoring circuit, whose output terminal is connected to the input terminal of the comparison circuit, is used to detect whether the current of the driving circuit exceeds a preset threshold current and output the detection result to the comparison circuit. The comparison circuit is used to turn off the drive power supply when the voltage of the drive power supply exceeds the preset threshold voltage and / or the current of the drive circuit exceeds the preset threshold current.

2. The flap drive protection circuit as described in claim 1, characterized in that, The reverse electromotive force discharge circuit includes: Eleventh comparator U11, drive power input terminal, three DC +5V voltage input terminals P5V, DC +15V voltage input terminal P15V, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, sixteenth resistor R16, seventeenth resistor R17, eighteenth resistor R18, nineteenth resistor R19, tenth resistor R10, ground terminal GND, eleventh intermediate capacitor C11, twelfth intermediate capacitor C12, first reverse suppression diode D11, eleventh transistor Q11 and twelfth field-effect transistor Q12; The drive power input terminal is connected to one end of the eleventh resistor R11. The positive input terminal of the eleventh comparator U11 is connected to the other end of the eleventh resistor R11 and one end of the twelfth resistor R12. The negative input terminal of the eleventh comparator U11 is connected to one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14. The power supply terminal of the eleventh comparator U11 is connected to the DC +5V voltage input terminal P5V. The other end of the thirteenth resistor R13 is connected to the DC +5V voltage input terminal P5V. The ground terminal of the eleventh comparator U11, the other end of the twelfth resistor R12, and the other end of the fourteenth resistor R14 are all connected to the ground terminal GND. The DC +5V voltage input terminal P5V is connected to one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to the output terminal of the eleventh comparator U11 and one end of the sixteenth resistor R16. The DC +15V voltage input terminal P15V is connected to the collector of the eleventh transistor Q11 through the seventeenth resistor R17 and the first reverse suppression diode D11. The seventeenth resistor R17 and the first reverse suppression diode D11 are connected in parallel. The base of the eleventh transistor Q11 is connected to the other end of the sixteenth resistor R16, the eighteenth resistor R18, and the eleventh intermediate capacitor C11. The eighteenth resistor R18 is connected in parallel with the eleventh intermediate capacitor C11. The emitter of the eleventh transistor Q11 is connected to the nineteenth resistor R19, the twelfth intermediate capacitor C12, and the twelfth field-effect transistor Q12. The nineteenth resistor R19 is connected in parallel with the twelfth intermediate capacitor C12. The tenth resistor R10 is connected to the twelfth field-effect transistor Q12.

3. The flap drive protection circuit as described in claim 2, characterized in that, In the reverse electromotive force discharge circuit, the input voltage of the positive input terminal of the eleventh comparator U11 is the voltage across the twelfth resistor R12, and the input voltage of the negative input terminal of the eleventh comparator U11 is the voltage across the fourteenth resistor R14.

4. The flap drive protection circuit as described in claim 2, characterized in that, In the reverse electromotive force discharge circuit, the base voltage of the eleventh transistor Q11 is the voltage across the eighteenth resistor R18 or the voltage across the eleventh intermediate capacitor C11, and the collector voltage of the eleventh transistor Q11 is the difference between the DC +15V voltage input terminal P15V and the voltage across the seventeenth resistor R17.

5. The flap drive protection circuit as described in claim 1, characterized in that, The overvoltage monitoring circuit includes: The twenty-first comparator U21, the high-end input terminal of the drive power supply, the three DC +5V voltage input terminals P5V, the twenty-first resistor R21, the twenty-second resistor R22, the twenty-third resistor R23, the twenty-fourth resistor R24, the twenty-fifth resistor R25 and the ground terminal GND; The power supply terminal of the 21st comparator U21 is connected to the DC +5V voltage input terminal P5V. The positive input terminal of the 21st comparator U21 is connected to one end of the 21st resistor R21 and one end of the 22nd resistor R22. The other end of the 21st resistor R21 is connected to the DC +5V voltage input terminal P5V. The negative input terminal of the 21st comparator U21 is connected to one end of the 23rd resistor R23 and one end of the 24th resistor R24. The high-side input terminal of the drive power supply is connected to the other end of the 23rd resistor R23. The other end of the 23rd resistor R23 is the input terminal of the overvoltage monitoring circuit. The output terminal of the 21st comparator U21 is connected to the DC +5V voltage input terminal P5V through the 25th resistor R25. The intersection of the output terminal of the 21st comparator U21 and the 25th resistor R25 is the output terminal of the overvoltage monitoring circuit. The ground terminal of the 21st comparator U21, the other end of the 22nd resistor R22, and the other end of the 24th resistor R24 ​​are all connected to the ground terminal GND.

6. The flap drive protection circuit as described in claim 5, characterized in that, In the overvoltage monitoring circuit, the input voltage of the positive input terminal of the 21st comparator U21 is the voltage across the 22nd resistor R22, and the input voltage of the negative input terminal of the 21st comparator U21 is the voltage across the 24th resistor R24.

7. The flap drive protection circuit as described in claim 1, characterized in that, The current acquisition circuit and the overcurrent monitoring circuit include: The system includes: 31st current sensor U31, 32nd comparator U32, three DC +5V voltage input terminals P5V, 31st intermediate capacitor C31, ground terminal GND, current acquisition input terminal, current acquisition output terminal, overcurrent monitoring output terminal, output voltage V1 terminal, 31st resistor R31, 32nd resistor R32, 33rd resistor R33, and 34th resistor R34. In the current acquisition circuit, the thirty-first current sensor U31 is connected to the DC +5V voltage input terminal P5V, the thirty-first intermediate capacitor C31, and the ground terminal GND. Terminals 1 and 2 of the thirty-first current sensor U31 serve as the current acquisition input terminals of the current acquisition circuit, and terminals 3 and 4 of the thirty-first current sensor U31 serve as the current acquisition output terminals of the current acquisition circuit. The output voltage V1 terminal of the thirty-first current sensor U31 is connected to one end of the thirty-first resistor R31 in the overcurrent monitoring circuit. The two ends of the thirty-first intermediate capacitor C31 are connected to the DC +5V voltage input terminal P5V and the ground terminal GND, respectively. In the overcurrent monitoring circuit, the DC +5V voltage input terminal P5V is connected to the power supply terminal of the 32nd comparator U32. The negative input terminal of the 32nd comparator U32 is connected to the other end of the 31st resistor R31. One end of the 31st resistor R31 is the input terminal of the overcurrent monitoring circuit. The positive input terminal of the 32nd comparator U32 is connected to the DC +5V voltage input terminal P5V through the 32nd resistor R32. The positive input terminal of the 32nd comparator U32 is connected to one end of the 33rd resistor R33. The output terminal of the 32nd comparator U32 is connected to the DC +5V voltage input terminal P5V through the 34th resistor R34. The intersection of the output terminal of the 32nd comparator U32 and the 34th resistor R34 is the output terminal of the overcurrent monitoring circuit. The ground terminal of the 32nd comparator U32 and the other end of the 33rd resistor R33 are both connected to the ground terminal GND.

8. The flap drive protection circuit as described in claim 7, characterized in that, In the current acquisition circuit and overcurrent monitoring circuit, the input voltage of the positive input terminal of the thirty-second comparator U32 is the output voltage of the thirty-first resistor R31, and the input voltage of the negative input terminal of the thirty-second comparator U32 is the voltage across the thirty-third resistor R33.

9. The flap drive protection circuit as described in any one of claims 1 to 8, characterized in that, The comparison circuit includes, AND gate U1, transistor Q2, resistor assembly and field-effect transistor Q1, The input terminal of the AND gate U1 is connected to the output terminal of the overvoltage monitoring circuit and the output terminal of the overcurrent monitoring circuit, respectively. The output terminal of the AND gate U1 is connected to the base of the transistor Q2 through the resistor assembly. The collector of the transistor Q2 is connected to the input terminal of the current acquisition circuit through the field-effect transistor Q1 and the resistor assembly. The emitter of the transistor Q2 is connected to the resistor assembly.

10. The flap drive protection circuit as described in claim 9, characterized in that, The resistor assembly includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and an intermediate capacitor C1; In the comparator circuit, the base of transistor Q2 is connected to the output of AND gate U1 through the third resistor R3, the emitter of transistor Q2 is connected to the base of transistor Q2 through the fourth resistor R4 and the intermediate capacitor C1, the fourth resistor R4 and the intermediate capacitor C1 are connected in parallel, and the collector of transistor Q2 is connected to the first resistor R1 and the field-effect transistor Q1 through the second resistor R2, the first resistor R1 and the field-effect transistor Q1 are connected in parallel; The first resistor R1 is connected to the second resistor R2, the field-effect transistor Q1, and the current acquisition circuit; The comparison circuit further includes: A reverse suppression diode D1 is provided, with one end connected to the driving power supply and the other end connected to the input terminal of the current acquisition circuit, the first resistor R1, and the field-effect transistor Q1.

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