CN105977908B - Unmanned plane can recover DC over-voltage protection circuit automatically - Google Patents

Abstract

The present invention relates to a kind of unmanned planes can recover DC over-voltage protection circuit automatically.Its purpose is to provide a kind of vdiverse in function, reliability it is high can recover DC over-voltage protection circuit automatically.The present invention includes first comparator, the second comparator, magnetic latching relay, contactor and reference power supply, and first comparator and the second comparator all use the two-way comparator of model LM193JG.According to first comparator and the difference for being connected and disconnected from mode of each pin of the second comparator; circuit can be respectively at overvoltage protection state, more than pressure guard mode and normal automatic return circuit state; make whole system while transition and overvoltage protection requirement is met; both will not due to voltage instability frequent switching; it again can automatic recovery of power supply; guarantee to greatly reduce application risk, further improve the reliability and security of airborne power supply system.

Description

The drone can automatically restore the DC overvoltage protection circuit

technical field

The invention relates to the field of aviation electrics, in particular to an automatic recovery DC overvoltage protection circuit for an unmanned aerial vehicle.

Background technique

The power supply and distribution design of unmanned aerial vehicles is an aviation electrical system that has attracted more and more attention in the past ten years. Electricity, among them, overvoltage protection is a very important component. The basic principle of overvoltage protection is to set an appropriate threshold through the comparator. When the reference power supply voltage of the generator is higher than a certain voltage value and reaches a certain time, the comparator triggers, generates a switching signal, controls the relay, and realizes the reference power supply and the bus bar. Off-grid, thereby protecting other electrical and electronic equipment on board.

The traditional overvoltage protection circuit has anti-delay characteristics, but the function is single. It does not have a direct switching function without anti-delay when the voltage exceeds the voltage, and there is no self-recovery function when the voltage returns to normal voltage, and requires the entire In the process, there is no frequent switching of the main contactor caused by the instantaneous voltage instability, which has caused great limitations to the use of the overvoltage protection circuit in the field of drones.

Contents of the invention

The technical problem to be solved by the present invention is to provide a DC overvoltage protection circuit with multiple functions and high reliability that can automatically restore the UAV.

The UAV of the present invention can automatically restore the DC overvoltage protection circuit, which includes a first comparator, a second comparator, a magnetic latching relay, a contactor and a reference power supply, and both the first comparator and the second comparator use a model of LM193JG dual-way comparator, the reference voltage end passes through the voltage dividing resistor composed of the twenty-fifth resistor and the twenty-sixth resistor, and the RC delay circuit composed of the twenty-seventh resistor and the twenty-first capacitor, and then compares with the first The first non-inverting pin of the first comparator is connected, the first inverting pin and the first grounding pin of the first comparator are respectively connected with the first non-inverting pin of the first comparator, and the sixth wire is drawn out at the reference voltage terminal , a voltage dividing resistor composed of the 23rd resistor and the 24th resistor is connected in series on the sixth wire, and the ninth wire is drawn between the 23rd resistor and the 24th resistor, and the other end of the ninth wire is connected to the One end of the thirtieth resistor is connected, the other end of the thirtieth resistor is connected to the second non-inverting pin of the first comparator through the tenth wire, the twenty-third capacitor is arranged on the tenth wire, and the first comparator's The two grounding pins are connected to the zero potential point, the first output pin of the first comparator is connected to the anode of the first diode through the twelfth wire, and the second reverse pin of the first comparator is connected through the thirteenth wire The wire is connected to the positive pole of the second diode, and the negative pole of the first diode is connected to the negative pole of the second diode to lead out the fourteenth wire at the connection point, and the other end of the fourteenth wire is connected to the third diode Connect the cathode of the transistor, the anode of the third diode is connected to the base of the first triode, the emitter of the first triode is connected to the zero potential point, the collector of the first triode is connected to the power supply terminal of the battery connected, the power supply end of the battery is also connected to the first output pin of the first comparator and the second reverse pin of the first comparator respectively, and the power supply end of the battery is connected to the second output pin of the first comparator, The emitter of the second triode is connected to the zero potential point, the collector of the second triode is connected to the power supply terminal of the storage battery, the base of the second triode is connected to the negative pole of the fourth diode, and the fourth and second The anode of the diode is connected to the first output pin of the second comparator, the twentieth wire is drawn between the anode of the fourth diode and the second comparator, and the other end of the twentieth wire is connected to the power supply end of the battery connection, the reference voltage terminal passes through the voltage dividing resistor composed of the 21st resistor and the 22nd resistor, and the RC delay circuit composed of the 34th resistor and the 24th capacitor, and then connects with the first synchronous circuit of the second comparator. Phase pin connection, the first inverting pin of the second comparator is connected with the first non-inverting pin of the second comparator, the first inverting pin of the second comparator is connected to the zero potential point, the second comparator A twenty-seventh capacitor is arranged between the first inverting pin of the comparator and the zero potential point, the first ground pin of the second comparator is connected to the zero potential point, and the second output pin of the second comparator is connected to the zero potential point At the power supply end of the battery, a magnetic latching relay is installed between the collector of the first triode and the collector of the second triode, the coil of the magnetic latching relay is connected to the control terminal of the contactor, and the voltage input terminal of the contactor is connected to the Reference voltage terminal connection.

The UAV of the present invention can automatically restore the DC overvoltage protection circuit, wherein the reference power supply includes a reference voltage source, a storage battery and a plurality of capacitors, the output terminal of the storage battery is connected to the input port of the reference voltage source, and the output port of the reference voltage source is connected to the The ground terminal of the reference voltage source is connected to the zero potential point, the eighteenth capacitor and the nineteenth capacitor are connected in parallel between the input port of the reference voltage source and the zero potential point, and the output port of the reference voltage source is connected to the zero potential point A twentieth capacitor is provided between the points.

The UAV of the present invention can automatically restore the DC overvoltage protection circuit, wherein the reference voltage source is a reference voltage source of model AD586SQ produced by AD Company.

The drone of the present invention can automatically restore the DC overvoltage protection circuit, wherein both the third diode and the fourth diode are Zener diodes.

The drone of the present invention can automatically restore the DC overvoltage protection circuit, wherein one end of the twenty-fifth resistor is connected to the reference voltage terminal through the first wire, and the other end of the twenty-fifth resistor is connected to the twenty-fifth resistor through the second wire. One end of the six resistors is connected, the other end of the twenty-sixth resistor is connected to the zero potential point through the third wire, the fourth wire is drawn out from the second wire, the other end of the fourth wire is connected to one end of the twenty-seventh resistor, The other end of the twenty-seventh resistor is connected to the first non-inverting pin of the first comparator through the fifth wire, and a twenty-first capacitor is arranged between the third wire and the fourth wire.

The UAV of the present invention can automatically restore the DC overvoltage protection circuit, wherein one end of the twenty-first resistor is connected to the reference voltage terminal through the twenty-first wire, and the other end of the twenty-first resistor is connected through the twenty-second wire Connect with one end of the 22nd resistor, the other end of the 22nd resistor is connected to the zero potential point, the 23rd wire is drawn from the 22nd wire, the other end of the 23rd wire is connected to the 34th wire One end of the resistor is connected, the other end of the thirty-fourth resistor leads to the twenty-fifth wire, and the other end of the twenty-fifth wire is connected to the first non-inverting pin of the second comparator, set on the twenty-fifth wire There is a twenty-fourth capacitor, a twenty-sixth lead is drawn from the twenty-fourth lead, the other end of the twenty-sixth lead is connected to a zero potential point, and the twenty-seventh capacitor is arranged on the twenty-sixth lead.

The drone of the present invention can automatically restore the DC overvoltage protection circuit, wherein the output voltage of the power supply terminal of the storage battery is 28V.

The UAV can automatically restore the DC overvoltage protection circuit of the present invention. The overvoltage protection state, overvoltage protection state and normal automatic recovery circuit state enable the entire system to meet the requirements of transient and overvoltage protection, and at the same time, it will not switch frequently due to voltage instability, and can automatically restore power supply to ensure It greatly reduces the risk of use, further improves the reliability and safety of the onboard power supply system, and provides a broad space for the application of overvoltage protection circuits in the field of drones.

The automatic recovery of the DC overvoltage protection circuit for the drone of the present invention will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the circuit structure diagram of the self-recovery overvoltage protection circuit in the DC overvoltage protection circuit that can automatically recover from the unmanned aerial vehicle of the present invention;

Fig. 2 is the circuit structure diagram of the reference power supply in the DC overvoltage protection circuit that can automatically restore the UAV of the present invention;

Fig. 3 is the circuit diagram when the UAV of the present invention can automatically restore the DC overvoltage protection circuit to work in the overvoltage protection state;

Fig. 4 is the circuit diagram when the UAV of the present invention can automatically restore the DC overvoltage protection circuit to work in the overvoltage protection state;

Fig. 5 is a circuit diagram of the automatic recovery DC overvoltage protection circuit of the drone of the present invention working in the normal automatic recovery circuit state.

Detailed ways

The unmanned aerial vehicle of the present invention can automatically restore the DC overvoltage protection circuit, including a reference power supply circuit and a self-recovery overvoltage protection circuit. Powers the resettable overvoltage protection circuit.

As shown in Figure 1, it is a circuit structure diagram of the self-recovery overvoltage protection circuit in the automatic recovery DC overvoltage protection circuit of the unmanned aerial vehicle of the present invention, including a first comparator, a second comparator, a magnetic latching relay Ka, a contactor KM and reference power supply, the first comparator and the second comparator all adopt the dual-way comparator model LM193JG. The reference voltage end is connected to one end of the twenty-fifth resistor R25 through the first wire, the other end of the twenty-fifth resistor R25 is connected to one end of the twenty-sixth resistor R26 through the second wire, and the other end of the twenty-sixth resistor R26 One end is connected to the zero potential point GND through the third wire, and the fourth wire is drawn out from the second wire, and the other end of the fourth wire is connected to one end of the twenty-seventh resistor R27, and the other end of the twenty-seventh resistor R27 is The five wires are connected to the first non-inverting pin 3 of the first comparator, a twenty-first capacitor C21 is arranged between the third wire and the fourth wire, and the twenty-seventh resistor R27 and the twenty-first capacitor C21 are formed RC delay circuit. The first inverting pin 2 and the first grounding pin 2 of the first comparator are respectively connected to the first non-inverting pin 3 of the first comparator, and the first inverting pin 2 of the first comparator is connected to the first A twenty-second capacitor C22 is provided between the non-inverting pin 3 , and a twenty-fifth capacitor C25 is provided between the first ground pin 2 and the first non-inverting pin 3 of the first comparator. Draw the sixth wire on the first wire, the other end of the sixth wire is connected to one end of the twenty-third resistor R23, and the other end of the twenty-third resistor R23 is connected to one end of the twenty-fourth resistor R24 through the seventh wire , the other end of the twenty-fourth resistor R24 is connected to the zero potential point GND through the eighth wire, and the ninth wire is drawn out from the seventh wire, and the other end of the ninth wire is connected to one end of the thirtieth resistor R30, and the thirtieth The other end of the resistor R30 is connected to the second non-inverting pin 6 of the first comparator through the tenth wire, a twenty-third capacitor C23 is arranged on the tenth wire, and the second grounding pin 5 of the first comparator is connected through the The eleventh wire is connected to the zero potential point GND, and a twenty-sixth capacitor C26 is arranged on the eleventh wire. The first output pin 1 of the first comparator is connected to the anode of the first diode D1 through the twelfth wire, and the second reverse pin 7 of the first comparator is connected to the second diode D1 through the thirteenth wire The positive pole of D2 is connected, the negative pole of the first diode D1 is connected with the negative pole of the second diode D2, and the fourteenth wire is drawn at the connection point, and the other end of the fourteenth wire is connected to one end of the thirty-first resistor R31 connection, the other end of the thirty-first resistor R31 is connected to the cathode of the third diode D3, the anode of the third diode D3 is connected to the base of the first transistor Q1, and the emitter of the first transistor Q1 The pole is connected to the zero potential point GND, the collector of the first triode Q1 is connected to the power supply end of the battery through the fifteenth wire, and the power supply end of the battery is connected to the first comparator through the sixteenth wire and the seventeenth wire respectively. The first output pin 1 of the first comparator is connected to the second reverse pin 7 of the first comparator, the 28th resistor R28 is set on the 16th wire, and the 29th resistor R29 is set on the 17th wire, The power supply end of the storage battery is also connected to the second output pin 8 of the first comparator. The emitter of the second triode Q2 is connected to the zero potential point GND, the collector of the second triode Q2 is connected to the power supply terminal of the battery through the eighteenth wire, and the base of the second triode Q2 is connected to the fourth and second The cathode of the diode D4 is connected, the anode of the fourth diode D4 is connected to one end of the thirty-second resistor R32, and the other end of the thirty-second resistor R32 is connected to the first output lead of the second comparator through the nineteenth wire. The pin 1' is connected, the twentieth lead is drawn from the nineteenth lead, the other end of the twentieth lead is connected to the power supply end of the storage battery, and a thirty-third resistor R33 is set on the twentieth lead. The reference voltage terminal is connected to one end of the twenty-first resistor R21 through the twenty-first wire, and the other end of the twenty-first resistor R21 is connected to one end of the twenty-second resistor R22 through the twenty-second wire, and the twenty-second The other end of the resistor R22 is connected to the zero potential point GND, and the twenty-third wire is drawn out from the twenty-second wire, and the other end of the twenty-third wire is connected to one end of the thirty-fourth resistor R34, and the thirty-fourth resistor The other end of R34 leads out the twenty-fourth wire and the twenty-fifth wire respectively, and the other end of the twenty-fourth wire and the other end of the twenty-fifth wire are respectively connected to the first inverting pin 2 of the second comparator 'and the first in-phase pin 3', the twenty-fourth capacitor C24 is set on the twenty-fifth wire, the twenty-sixth wire is drawn out on the twenty-fourth wire, and the other end of the twenty-sixth wire is connected to Enter the zero potential point GND, the twenty-seventh capacitor C27 is arranged on the twenty-sixth wire, the thirty-fourth resistor R34 and the twenty-fourth capacitor C24 form an RC delay circuit. The first ground pin 4' of the second comparator is connected to the zero potential point GND. The second output pin 8' of the second comparator is connected to the power supply end of the storage battery. A magnetic latching relay Ka is installed between the collector of the first triode Q1 and the collector of the second triode Q2, the coil of the magnetic latching relay Ka is connected to the control terminal of the contactor KM, and the voltage input of the contactor KM The terminal is connected to the reference voltage terminal through the twenty-seventh wire, and the voltage output terminal of the contactor KM performs voltage output to the outside. Both the third diode D3 and the fourth diode D4 are Zener diodes.

As shown in Figure 2, it is a circuit structure diagram of the reference power supply in the UAV that can automatically restore the DC overvoltage protection circuit of the present invention, including a reference voltage source, a storage battery and a plurality of capacitors, the output terminal of the storage battery and the input port of the reference voltage source IN connection, the output port OUT of the reference voltage source is connected to the reference voltage terminal, and the ground terminal of the reference voltage source is connected to the zero potential point GND. An eighteenth capacitor C18 and a nineteenth capacitor C19 are connected in parallel between the input port IN of the reference voltage source and the zero potential point GND, and a twentieth capacitor is arranged between the output port OUT of the reference voltage source and the zero potential point GND C20. The reference voltage source selects the reference voltage source of model AD586SQ produced by AD Company. The battery support supplies power to the self-recovery overvoltage protection circuit through the reference voltage source, so as to ensure that the self-recovery overvoltage protection circuit can continue to work.

The output voltage of the power supply terminal of the storage battery used in one embodiment of the present invention is 28V.

When the measured generator reference power supply voltage is greater than 33.75V and less than 65V, when the present invention works in the overvoltage protection state, as shown in Figure 3, the second ground pin 5, The second non-inverting pin 6, the second inverting pin 7 and the second output pin 8 are disconnected, while the first output pin 1' of the second comparator, the first inverting pin 2', the first The non-inverting pin 3', the first grounding pin 4' and the second output pin 8' are disconnected, and the circuit performs transient and overvoltage protection. The higher the voltage, the shorter the protection response time, the faster the action, and the contact The faster the disconnection time of the device KM. Among them, the reference power supply is sent to the first comparator through the RC delay circuit composed of the twenty-seventh resistor R27 and the twenty-first capacitor C21 after being divided by the twenty-fifth resistor R25 and the twenty-sixth resistor R26 The first non-inverting pin 3 of the first comparator is connected to the reference power supply, and the first output pin 1 of the first comparator controls the first triode Q1. When the reference power supply voltage of the machine is within the range of greater than 33.75V and less than 65V, the first comparator drives the magnetic latching relay Ka by controlling the first triode Q1, thereby driving the coil of the relay Ka to perform an off-grid action, realizing the contactor KM offline.

When the measured generator reference power supply voltage is greater than 65V, the present invention works in the overvoltage protection state, as shown in Figure 4, at this time the first output pin 1 of the first comparator, the first inverting Pin 2, first non-inverting pin 3, first ground pin 4 and second output pin 8 are disconnected, second comparator first output pin 1', first inverting pin 2', The first non-inverting pin 3', the first grounding pin 4' and the second output pin 8' are disconnected, the circuit does not perform anti-delay control, and directly disconnects the coil of the relay Ka to realize the disconnection of the contactor KM network, the response time at this time is only the action time of the relay Ka and the contactor KM, where the reference power supply is directly sent to To the second non-inverting pin 6 of the first comparator, the second grounding pin 5 of the first comparator is grounded, and the second inverting pin 7 controls the first triode Q1, and the first triode Q1 is magnetically held The relay Ka is driven, so that the coil of the relay Ka is driven to perform an off-network action, and the off-network of the contactor KM is realized.

When the measured generator reference power supply voltage is less than 29.5V, the present invention works in the normal automatic recovery circuit state, as shown in Figure 5, at this moment the first output pin 1 of the first comparator, the first The inverting pin 2, the first non-inverting pin 3, the first grounding pin 4, the second grounding pin 5, the second non-inverting pin 6, the second inverting pin 7 and the second output pin 8 are off When the connection is opened, the circuit performs time-delay control, the coil of the relay Ka should be closed automatically, and the contactor KM is controlled to connect to the grid. The RC delay circuit composed of the thirty-fourth resistor R34 and the twenty-fourth capacitor C24 is directly sent to the first non-inverting pin 3' of the second comparator, and the first inverting pin 2' of the second comparator is connected to Input the reference power supply, the first output pin 1' of the second comparator controls the second triode Q2, and the second triode Q2 drives the magnetic latching relay Ka, thereby driving the coil of the magnetic latching relay Ka to perform grid-connected action , Realize the grid connection of contactor KM.

The UAV of the present invention can automatically restore the DC overvoltage protection circuit. According to the different connection and disconnection modes of the pins of the first comparator and the second comparator, the circuit can be in the overvoltage protection state, overvoltage protection state and The circuit status is automatically restored to normal, so that the entire system will not switch frequently due to voltage instability while meeting the requirements of transient and overvoltage protection, and can automatically restore power supply, ensuring that the risk of use can be greatly reduced, and the airborne capacity can be further improved. The reliability and safety of the power supply system provide a broad space for the application of overvoltage protection circuits in the field of drones. The invention has various functions and high reliability, and has obvious advantages compared with the prior art.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (7)

1. A kind of unmanned aerial vehicle can automatically restore the DC overvoltage protection circuit, it is characterized in that: comprise the first comparator, the second comparator, magnetic latching relay (Ka), contactor (KM) and reference power supply, the first comparator Both the comparator and the second comparator use a dual comparator model LM193JG, and the reference voltage terminal passes through the voltage dividing resistor composed of the twenty-fifth resistor (R25) and the twenty-sixth resistor (R26) and the twenty-seventh resistor (R27) and the twenty-first capacitor (C21) are connected with the first non-inverting pin (3) of the first comparator after forming an RC delay circuit, and the first inverting pin (2) of the first comparator and The first ground pin (2) is respectively connected with the first non-inverting pin (3) of the first comparator, and the sixth wire is drawn at the reference voltage end, and the twenty-third resistor (R23) and the sixth wire are connected in series. The voltage divider resistance that the 24th resistance (R24) is formed, draws the 9th wire between the 23rd resistance (R23) and the 24th resistance (R24), the other end of the 9th wire connects with the 30th resistance One end of (R30) is connected, and the other end of the thirtieth resistance (R30) is connected to the second non-inverting pin (6) of the first comparator through the tenth wire, and the twenty-third capacitor (C23) is arranged on the tenth wire ), the second ground pin (5) of the first comparator is connected to the zero potential point (GND), and the first output pin (1) of the first comparator connects the first diode (D1) through the twelfth wire ), the second reverse pin (7) of the first comparator is connected to the anode of the second diode (D2) through the thirteenth wire, and the cathode of the first diode (D1) is connected to the second After the cathode of the diode (D2) is connected, the fourteenth wire is drawn at the connection point, and the other end of the fourteenth wire is connected with the cathode of the third diode (D3), and the anode of the third diode (D3) It is connected to the base of the first triode (Q1), the emitter of the first triode (Q1) is connected to the zero potential point (GND), the collector of the first triode (Q1) is connected to the power supply terminal of the battery connected, the power supply terminal of the storage battery is also connected with the first output pin (1) of the first comparator and the second reverse pin (7) of the first comparator respectively, and the power supply terminal of the storage battery is connected with the first output pin (7) of the first comparator Two output pins (8) are connected, the emitter of the second triode (Q2) is connected to the zero potential point (GND), the collector of the second triode (Q2) is connected to the power supply end of the battery, the second three The base of the diode (Q2) is connected to the cathode of the fourth diode (D4), and the anode of the fourth diode (D4) is connected to the first output pin (1') of the second comparator. The twentieth wire is drawn between the anode of the four diodes (D4) and the second comparator, the other end of the twentieth wire is connected to the power supply end of the battery, and the reference voltage end passes through the twenty-first resistor (R21) and The voltage dividing resistor formed by the 22nd resistor (R22) and the 34th resistor (R34) and the 24th capacitor (C24) form an RC delay circuit and then connect with the first non-inverting pin of the second comparator ( 3') connection, the first inverting pin (2') of the second comparator is connected to the first non-inverting pin of the second comparator Pin (3') connection, the first inverting pin (2') of the second comparator is connected to the zero potential point (GND), the first inverting pin (2') of the second comparator is connected to the zero potential A twenty-seventh capacitor (C27) is provided between the points (GND), the first ground pin (4') of the second comparator is connected to the zero potential point (GND), and the second output pin of the second comparator (8') connected to the power supply terminal of the storage battery, a magnetic latching relay (Ka) is installed between the collector of the first triode (Q1) and the collector of the second triode (Q2), and the magnetic latching relay (Ka ) coil is connected to the control terminal of the contactor (KM), and the voltage input terminal of the contactor (KM) is connected to the reference voltage terminal. 2. The unmanned aerial vehicle according to claim 1 can automatically restore the direct current overvoltage protection circuit, it is characterized in that: the reference power supply comprises a reference voltage source, a storage battery and a plurality of capacitors, the output terminal of the storage battery and the input of the reference voltage source port (IN) connection, the output port (OUT) of the reference voltage source is connected to the reference voltage terminal, the ground terminal of the reference voltage source is connected to the zero potential point (GND), the input port (IN) of the reference voltage source is connected to the zero potential point ( An eighteenth capacitor (C18) and a nineteenth capacitor (C19) are connected in parallel between GND), and a twentieth capacitor (C20) is arranged between the output port (OUT) of the reference voltage source and the zero potential point (GND). 3. The automatic recovery DC overvoltage protection circuit of the UAV according to claim 2, characterized in that: the reference voltage source is a reference voltage source of AD586SQ produced by AD Company. 4. The auto-recoverable DC overvoltage protection circuit for the drone according to claim 1, characterized in that: both the third diode (D3) and the fourth diode (D4) are Zener diodes. 5. The unmanned aerial vehicle according to claim 1 can automatically restore the DC overvoltage protection circuit, characterized in that: one end of the twenty-fifth resistor (R25) is connected to the reference voltage terminal through the first wire, and the twenty-fifth The other end of the fifth resistor (R25) is connected to one end of the twenty-sixth resistor (R26) through the second wire, and the other end of the twenty-sixth resistor (R26) is connected to the zero potential point (GND) through the third wire. The fourth wire is drawn from the second wire, the other end of the fourth wire is connected to one end of the twenty-seventh resistance (R27), and the other end of the twenty-seventh resistance (R27) is connected to the first comparator through the fifth wire. The first non-inverting pin (3) is provided with a twenty-first capacitor (C21) between the third wire and the fourth wire. 6. The unmanned aerial vehicle according to claim 1 can automatically restore the DC overvoltage protection circuit, characterized in that: one end of the twenty-first resistor (R21) is connected to the reference voltage terminal through the twenty-first wire, and the second The other end of the twenty-first resistor (R21) is connected to one end of the twenty-second resistor (R22) through the twenty-second wire, and the other end of the twenty-second resistor (R22) is connected to the zero potential point (GND). The 23rd wire is drawn from the 22nd wire, the other end of the 23rd wire is connected to one end of the 34th resistor (R34), and the 25th wire is drawn from the other end of the 34th resistor (R34) , the other end of the twenty-fifth wire is connected to the first non-inverting pin (3') of the second comparator, and the twenty-fourth capacitor (C24) is arranged on the twenty-fifth wire, and the twenty-fourth A twenty-sixth wire is drawn out from the wire, the other end of the twenty-sixth wire is connected to the zero potential point (GND), and a twenty-seventh capacitor (C27) is arranged on the twenty-sixth wire. 7. The auto-recoverable DC overvoltage protection circuit for the drone according to claim 1, wherein the output voltage of the power supply terminal of the battery is 28V.