CN212499931U

CN212499931U - Fuel cell control system for unmanned aerial vehicle

Info

Publication number: CN212499931U
Application number: CN202020950757.8U
Authority: CN
Inventors: 林法强; 王晓华
Original assignee: Shanghai Fuel Cell Vehicle Powertrain Co ltd
Current assignee: Shanghai Fuel Cell Vehicle Powertrain Co ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-02-09
Anticipated expiration: 2030-05-29

Abstract

The utility model provides a fuel cell control system for unmanned aerial vehicle, wherein, the unmanned aerial vehicle takes the hybrid power of fuel cell and lithium battery as output, and the lithium battery is taken as auxiliary battery; the fuel cell control system includes: the main control unit, internal integration has microcontroller circuit, fuel cell performance recovery circuit, fuel cell isolating circuit, lithium cell isolating circuit and output circuit, wherein, microcontroller circuit is connected with fuel cell performance recovery circuit, fuel cell isolating circuit, lithium cell isolating circuit and output circuit respectively, fuel cell performance recovery circuit and fuel cell isolating circuit are connected with fuel cell, output module is connected with the unmanned aerial vehicle motor, lithium cell isolating circuit is connected with the lithium cell. Effectively solve current unmanned aerial vehicle fuel cell control system structure complicacy, inefficiency scheduling technical problem.

Description

Fuel cell control system for unmanned aerial vehicle

Technical Field

The utility model relates to an unmanned air vehicle technique field indicates a fuel cell control system especially.

Background

At present, the principle of the fuel cell control system for the unmanned aerial vehicle generally includes two types: one is to take the fuel cell as power output, the output of the fuel cell is directly connected to the motor of the unmanned aerial vehicle at the moment, and when hydrogen is opened, the fuel cell is output; when the hydrogen is turned off, the fuel cell is shut down. The other type takes the hybrid power of a fuel cell and a lithium battery as output, wherein the lithium battery is taken as an auxiliary battery and provides starting electricity for the control system.

For the first working mode, the controller only controls the basic operating conditions of the fuel cell, the whole system is not protected, high-power output is needed in the ascending or sudden acceleration process of the unmanned aerial vehicle, and the performance of the fuel cell is greatly influenced because no auxiliary battery is provided. The control mode has the characteristics of low efficiency, low safety performance and the like. Although the second working mode is used for upgrading the first working mode and adding the auxiliary battery to avoid instantaneous sudden change of the power of the fuel cell, the auxiliary parts such as a diode and a contactor are often required to be additionally added in the control system, so that the complexity of system arrangement is increased, the weight of the system is increased, and the control mode has the characteristics of complex structure, low efficiency and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fuel cell control system for unmanned aerial vehicle effectively solves current unmanned aerial vehicle fuel cell control system structure complicacy, inefficiency scheduling technical problem.

The utility model provides a technical scheme as follows:

a fuel cell control system for an unmanned aerial vehicle is characterized in that the unmanned aerial vehicle takes the hybrid power of a fuel cell and a lithium battery as output, and the lithium battery is taken as an auxiliary battery; the fuel cell control system includes: the main control unit, internal integration has microcontroller circuit, fuel cell performance recovery circuit, fuel cell isolating circuit, lithium cell isolating circuit and output circuit, wherein, microcontroller circuit is connected with fuel cell performance recovery circuit, fuel cell isolating circuit, lithium cell isolating circuit and output circuit respectively, fuel cell performance recovery circuit and fuel cell isolating circuit are connected with fuel cell, output module is connected with the unmanned aerial vehicle motor, lithium cell isolating circuit is connected with the lithium cell.

Further preferably, a charging circuit for charging the lithium battery is further integrated in the main control unit, and is respectively connected with the lithium battery and the microcontroller circuit.

Further preferably, a TTL communication circuit used for carrying out data real-time exchange with the unmanned aerial vehicle is further integrated in the main control unit, and the TTL communication circuit is connected with the microcontroller circuit and is in communication connection with an unmanned aerial vehicle communication module in the unmanned aerial vehicle.

Further preferably, the fuel cell control system further comprises a stack voltage sensor, a stack current sensor, a stack temperature sensor, a lithium battery voltage sensor and a lithium battery current sensor, wherein the stack voltage sensor, the stack current sensor and the stack temperature sensor are respectively connected with a stack in the fuel cell, and the lithium battery voltage sensor and the lithium battery current sensor are respectively connected with the lithium battery;

the main control unit is also integrated with a data acquisition and control circuit which is respectively connected with a galvanic pile voltage sensor, a galvanic pile current sensor, a galvanic pile temperature sensor, a lithium battery voltage sensor and a lithium battery current sensor.

Further preferably, the fuel cell control system further comprises a hydrogen supply module and a hydrogen concentration sensor, which are respectively connected with the fuel cell and the data acquisition and control circuit.

Further preferably, the data acquisition and control circuit comprises: the device comprises a voltage monitoring circuit, a current monitoring circuit, a temperature monitoring circuit, a pressure monitoring circuit and a valve body control circuit, wherein the voltage monitoring circuit is respectively connected with a fuel cell and a lithium battery, the current monitoring circuit is respectively connected with the fuel cell and the lithium battery, the temperature monitoring circuit is connected with the fuel cell, the pressure monitoring circuit is connected with a hydrogen cylinder in a hydrogen supply module, and the valve body control circuit is connected with a hydrogen inlet battery valve and a hydrogen exhaust battery valve of the hydrogen supply module.

Further preferably, the fuel cell control system further comprises a start-stop switch connected with the data acquisition and control circuit.

In the fuel cell control system for the unmanned aerial vehicle, the fuel cell is used as a main power supply, the lithium battery is used as an auxiliary power supply, intelligent control is adopted to realize energy management, and the control and adjustment of the performance of the fuel cell and the lithium battery are realized in work, so that the fuel cell and the lithium battery can exert respective optimal performance to realize reasonable distribution of energy; in addition, the master control unit is integrated with a microcontroller circuit, a fuel cell performance recovery circuit, a fuel cell isolation circuit and a lithium battery isolation circuit, and has the characteristics of high efficiency, high safety performance, simple control method, simple structure, low cost and the like.

Drawings

The foregoing features, technical features, advantages and implementations of which will be further described in the following detailed description of the preferred embodiments in a clearly understandable manner in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of an embodiment of a fuel cell control system for a central unmanned aerial vehicle according to the present invention;

fig. 2 is a diagram of a main control chip in a microcontroller circuit according to an embodiment of the present invention;

fig. 3 is a fuel cell isolation circuit diagram/lithium battery isolation circuit diagram according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a fuel cell performance recovery circuit according to an embodiment of the present invention;

fig. 5 is a charging circuit diagram according to an embodiment of the present invention;

fig. 6 is a circuit diagram of TTL communication according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another embodiment of the fuel cell control system for the unmanned aerial vehicle according to the present invention;

the reference numbers illustrate:

10-a main control unit, 11-a microcontroller circuit, 12-a fuel cell performance recovery circuit, 13-a fuel cell isolation circuit, 14-a lithium battery isolation circuit, 15-an output circuit, 16-a TTL communication circuit, 17-a charging circuit, 18-a data acquisition and control circuit, 20-a fuel cell, 21-a stack voltage sensor, 22-a stack current sensor, 23-a stack temperature sensor, 24-a lithium battery voltage sensor, 25-a lithium battery current sensor, 26-a hydrogen supply module, 27-a hydrogen concentration sensor, 28-a start-stop switch, 30-a lithium battery and 40-an unmanned aerial vehicle motor.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from them without inventive effort.

An embodiment of the present invention is, as shown in fig. 1, a fuel cell control system for an unmanned aerial vehicle, wherein: the main control unit 10, the internal integration has microcontroller circuit 11, fuel cell performance recovery circuit 12, fuel cell isolation circuit 13, lithium battery isolation circuit 14 and output circuit 15, wherein, microcontroller circuit 11 respectively with fuel cell performance recovery circuit 12, fuel cell isolation circuit 13, lithium battery isolation circuit 14 and output circuit 15 are connected, fuel cell performance recovery circuit 12 and fuel cell isolation circuit 13 are connected with fuel cell 20, output module is connected with unmanned aerial vehicle motor 40, lithium battery isolation circuit 14 is connected with lithium battery 30.

In this embodiment, unmanned aerial vehicle is as the output with fuel cell 20 and lithium cell 30's hybrid, and lithium cell 30 is as auxiliary battery, and galvanic pile and lithium cell 30 in fuel cell 20 can export simultaneously, and when unmanned aerial vehicle takes off or accelerates, lithium cell 30 can instantaneous output heavy current to the protection galvanic pile. The output of fuel cell 20 is connected with fuel cell isolating circuit 13, and the output of lithium cell 30 is connected with lithium cell isolating circuit 14, is connected with unmanned aerial vehicle motor 40 through output module, controls unmanned aerial vehicle work.

The short-time electric pile short-circuit function is arranged in the fuel cell performance recovery circuit and used for recovering the performance of the electric pile in the fuel cell 20, when the voltage of the electric pile is lower than a set alarm value, the micro-controller circuit 11 immediately controls the electric pile short-circuit function to be started, the electric pile performance is improved, the electric pile short-circuit time can be completed within 5-10ms (milliseconds), and the safety performance of the unmanned aerial vehicle is greatly improved. The preset alarm value can be set according to actual conditions, such as 0.55V. The fuel cell isolation module is mainly used for preventing the high voltage of the fuel cell from being directly applied to the lithium battery to damage the lithium battery and simultaneously cutting off the output of the fuel cell; the lithium battery isolation module is mainly used for preventing the output voltage of the lithium battery from being directly applied to the fuel battery to damage the fuel battery and simultaneously cutting off the output of the lithium battery.

In one example, as shown in FIG. 2, a Phlips LPC2114 chip is used as the master chip in the microcontroller circuit 11. As shown in fig. 3, the fuel cell isolation circuit 13 includes: a photocoupler U26(TLP181), an N-type triode Q29(S8050), a P-type triode Q28(S8550), an NMOS tube Q30(HY3810B) and a first isolating diode D30(43CTQ080), wherein the negative electrode (pin K) of a light emitting diode in the photocoupler U26 is connected with a main control chip (pin P0.22) in the microcontroller circuit 11, the emitter (pin E) of a phototriode is connected with the bases of the N-type triode Q29 and the P-type triode Q28, the emitter of the N-type triode Q29 and the emitter of the P-type triode Q28 are further connected with the G electrode of the NMOS tube Q30 after being connected, the positive electrode (pin A) of the first isolating diode D30 is connected with the S electrode of the NMOS tube Q30, the D electrode of the NMOS tube Q30 is connected with the input terminal Stack of the fuel cell 20, and the positive electrode (pin K) of the first isolating diode D30 is connected with the output terminal of the fuel cell 20. The LED driving circuit also comprises a plurality of groups of resistive elements, namely a resistor R120(330R), a resistor R121(100K), a resistor R122(30R), a resistor R123(6.8R) and a resistor R124(100K), wherein the resistor R120 is connected with the anode (pin A) of a light emitting diode in the photocoupler U26, the resistor R122 is connected with the collector (pin C) of a phototriode in the photocoupler U26, the resistor R121 is connected between the base of the N-type triode Q29 and the emitter of the P-type triode Q28, the resistor R123 is connected between the emitter of the N-type triode Q29 and the G pole of the NMOS pipe Q30, and the R124 is connected between the G pole and the S pole of the NMOS pipe Q30.

In operation, the photocoupler U26, the N type triode Q29, the P type triode Q28 and the resistive element form a driving circuit that cuts off the output of the fuel cell 20 by driving the NMOS transistor Q30 on and off. The first isolation diode D30 is mainly used to prevent the output voltage of the lithium battery 30 from being reversely connected to the fuel cell 20, and protect the fuel cell 20. The lithium battery isolation circuit 14 is the same as the fuel battery isolation circuit 13, and is not described herein, but the differences with respect to the circuit shown in fig. 3 are that the D-pole of the NMOS transistor Q30 is connected to the input terminal Li _ BatIN of the lithium battery 30, the anode (pin K) of the first isolation diode D30 is connected to the output terminal Li _ BatOUT of the fuel battery 20, and the first isolation diode D30 is mainly used to prevent the output voltage of the fuel battery 20 from being reversely connected to the lithium battery 30, so as to protect the lithium battery 30.

As shown in fig. 4, the fuel cell performance recovery circuit 12 includes 4 NMOS transistors, which are a first NMOS transistor Q31(HY3810B), a second NMOS transistor Q32(HY3810B), a third NMOS transistor Q33(HY3810B) and a fourth NMOS transistor Q34(HY3810B), wherein a G pole of the first NMOS transistor Q31 and a G pole of the second NMOS transistor Q32 are connected and connected to a main control chip (pin P0.20) in the microcontroller circuit 11, an S pole is connected to a D pole of the second NMOS transistor Q32, a G pole of the third NMOS transistor Q33 and a G pole of the fourth NMOS transistor Q34 are connected and connected to a main control chip (pin P0.20) in the microcontroller circuit 11, an S pole is connected to a D pole of the fourth NMOS transistor Q34, a D pole of the first NMOS transistor Q31 and a D pole of the third NMOS transistor Q33 are connected and connected to a positive pole (FC 20) of the fuel cell (FC 20), and a negative pole of the second NMOS transistor Q34 and a negative pole of the fourth NMOS transistor Q59620 (FC). The circuit also comprises a plurality of groups of resistive elements, namely a resistor R125(1K), a resistor R126(100K), a resistor R127(100K) and a resistor R128(1K), wherein the resistor R125 is connected between a master control chip (pin P0.20) in the microcontroller circuit 11 and a G pole of a first NMOS tube Q31, the resistor R128 is connected between the master control chip (pin P0.20) in the microcontroller circuit 11 and a G pole of a third NMOS tube Q33, the resistor R126 is connected between a G pole of the first NMOS tube Q31 and an S pole of a second NMOS tube Q32, and the resistor R127 is connected between a G pole of the second NMOS tube Q33 and an S pole of a fourth NMOS tube Q34.

In operation, the 4 NMOS transistors are driven to turn on and off by the main control chip (pin P0.20) in the microcontroller circuit 11. Specifically, when the average voltage of the single chip of the fuel cell 20 is lower than a preset threshold (e.g., 0.55V), the pin P0.20 of the main control chip is controlled to output a low level, so that the NMOS transistor is turned on for 5-10ms, the anode and the cathode of the fuel cell 20 are short-circuited, and the performance of the fuel cell 20 is improved.

It should be clear that, the above figures only show an exemplary main control chip, a fuel cell isolation circuit 13/lithium battery isolation circuit 14 and a fuel cell performance recovery circuit 12 in the microcontroller circuit 11, in other examples, the model of the main control chip and each specific circuit may be selected according to practical applications as long as the corresponding functional requirements can be met.

In another embodiment, the main control unit 10 further integrates a charging circuit 17 for charging the lithium battery 30, and the charging circuit 17 is connected to the lithium battery 30 and the microcontroller circuit 11, respectively, and when the power of the lithium battery 30 is lower than a preset value, the microcontroller circuit 11 controls the charging circuit 17 to charge the lithium battery 30. The preset value can be set according to actual conditions, such as 20% of the total power of the lithium battery 30.

In one example, as shown in fig. 5, the charging circuit 17 includes: the power supply circuit comprises a fuse F3(5A-1808), a voltage stabilizing chip U8(LM338T), a second isolation diode D6(6TQ045S), a current limiting resistor R14 (used for controlling charging current, 0.1R/1W), a first voltage dividing resistor R15(200R) and a second voltage dividing resistor R16(3.6K), wherein one end of the fuse F3 is connected with an input end (foot VIN) of the voltage stabilizing chip U8, the other end of the fuse F3 is externally connected with a charging power supply, and the anode of the second isolation diode D6 is connected with an output end (foot VOUT) of the voltage stabilizing chip U8 through the current limiting resistor R14; the first divider resistor R15 and the second divider resistor R16 are connected in series, one end of the series connection is connected between the current limiting resistor R14 and the second isolation diode D6, the other end of the series connection is grounded, a voltage regulation end (pin ADJ) of the voltage stabilizing chip U8 is connected between the first divider resistor R15 and the second divider resistor R16, and the negative electrode of the second isolation diode D6 is connected with a Charging end (LiBat _ Charging) of the lithium battery 30. In addition, the circuit further comprises a polar capacitor C6(220 muF/50V), a polar capacitor C18(47 muF/35V), a resistor R18(2K) and a light-emitting diode D5(LED lamp), wherein the polar capacitor C6 is connected to an input end (pin VIN) of a voltage stabilizing chip U8, the polar capacitor C18 is connected to the anode of a second isolating diode D6, one end of the R18 is connected to the anode of a second isolating diode D6, and the other end of the R18 is connected to the light-emitting diode D5.

In another embodiment, the master control unit 10 further integrates a TTL communication circuit 16 for exchanging data with the unmanned aerial vehicle in real time, the TTL communication circuit 16 is connected to the microcontroller circuit 11 and is in communication connection with an unmanned aerial vehicle communication module in the unmanned aerial vehicle, so that the TTL communication circuit 16 exchanges data with the unmanned aerial vehicle in real time in the master control unit 10, and the flight of the unmanned aerial vehicle is controlled. If, control system among the unmanned aerial vehicle is according to the power take off condition with fuel cell control system's real-time interaction, judges whether to continue to cruise or return voyage, protects unmanned aerial vehicle's safety.

In an example, as shown in fig. 6, the TTL communication circuit 16 includes a communication chip U6(MAX3485), a resistor R113(10K), a resistor R10(120R), and a capacitor C4(μ F/35V), wherein a pin R0 and a pin DI in the communication chip U6 are connected to a main control chip (RXD485, corresponding to pins P0.0 and P0.1) of the microcontroller circuit 11, a pin DE is connected to the main control chip (P0.4) of the microcontroller circuit 11 and to a power supply V3.3 through the resistor R113, a pin VCC is connected to the ground through a capacitor C4, and a resistor R10 is connected between the pin a and the pin B.

In another embodiment, as shown in fig. 7, the fuel cell control system further includes a stack voltage sensor 21, a stack current sensor 22, a stack temperature sensor 23, a lithium battery voltage sensor 24, and a lithium battery current sensor 25, where the stack voltage sensor 21, the stack current sensor 22, and the stack temperature sensor 23 are respectively connected to a stack in the fuel cell 20, and the lithium battery voltage sensor 24 and the lithium battery current sensor 25 are respectively connected to the lithium battery 30; the main control unit 10 further integrates a data acquisition and control circuit 18, which is respectively connected to a stack voltage sensor 21, a stack current sensor 22, a stack temperature sensor 23, a lithium battery voltage sensor 24, and a lithium battery current sensor 25. The fuel cell control system further comprises a hydrogen supply module 26 and a hydrogen concentration sensor 27, which are respectively connected with the fuel cell 20 and the data acquisition and control circuit 18. And/or, the fuel cell control system further comprises a start-stop switch 28 connected with the data acquisition and control circuit 18. In addition, the fuel cell control system also comprises an auxiliary system connected with the data acquisition and control circuit 18, and mainly comprises a stack inlet pressure sensor, a hydrogen inlet electromagnetic valve and a hydrogen exhaust electromagnetic valve.

The data acquisition and control circuit 18 includes: the hydrogen supply device comprises a voltage monitoring circuit, a current monitoring circuit, a temperature monitoring circuit, a pressure monitoring circuit and a valve body control circuit, wherein the voltage monitoring circuit is respectively connected with a fuel cell 20 and a lithium battery 30, the current monitoring circuit is respectively connected with the fuel cell 20 and the lithium battery 30, the temperature monitoring circuit is connected with the fuel cell 20, the pressure monitoring circuit is connected with a hydrogen cylinder in a hydrogen supply module 26, and the valve body control circuit is connected with a hydrogen inlet battery valve and a hydrogen exhaust battery valve of the hydrogen supply module 26. Specifically, the voltage monitoring circuit is mainly used to monitor the output voltage of the fuel cell 20 and the output voltage of the lithium battery 30; the current monitoring circuit is mainly used for monitoring the output current of the fuel cell 20 and the output current of the lithium battery 30; the temperature monitoring circuit is mainly used for monitoring the temperature of the fuel cell 20 and the ambient temperature; the pressure monitoring circuit is mainly used for monitoring the pressure of the hydrogen storage bottle and the stack entering pressure; the valve body control circuit is mainly used for controlling the hydrogen inlet cell valve and the hydrogen outlet cell valve so as to ensure the safe and stable operation of the fuel cell 20 system.

In operation, the main control unit 10 collects data such as hydrogen storage bottle pressure, stack entering pressure, stack temperature in the fuel cell 20, stack voltage, stack current, lithium battery voltage, and lithium battery current in real time, and then judges whether the fuel cell 20 and the lithium battery 30 normally operate or not according to the collected data, and whether the lithium battery 30 needs to be charged or not, so as to protect the system in real time. The lithium battery voltage sensor and the lithium battery current sensor are used for detecting the electric quantity of the lithium battery, and when the unmanned aerial vehicle takes off or accelerates, the lithium battery can output large current instantaneously to protect a pile; the other aspect is to judge whether to charge the lithium battery or not by monitoring data.

It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A fuel cell control system for an unmanned aerial vehicle is characterized in that the unmanned aerial vehicle takes the hybrid power of a fuel cell and a lithium battery as output, and the lithium battery is taken as an auxiliary battery; including the main control unit among the fuel cell control system, internal integration has microcontroller circuit, fuel cell performance recovery circuit, fuel cell buffer circuit, lithium cell buffer circuit and output circuit, wherein, microcontroller circuit respectively with fuel cell performance recovery circuit, fuel cell buffer circuit, lithium cell buffer circuit and output circuit are connected, fuel cell performance recovery circuit and fuel cell buffer circuit are connected with fuel cell, output circuit is connected with the unmanned aerial vehicle motor, lithium cell buffer circuit is connected with the lithium cell.

2. The fuel cell control system for unmanned aerial vehicle of claim 1, wherein the main control unit further integrates a charging circuit for charging the lithium battery, and the charging circuit is respectively connected with the lithium battery and the microcontroller circuit.

3. The fuel cell control system for the unmanned aerial vehicle as claimed in claim 1 or 2, wherein the master control unit further integrates a TTL communication circuit for exchanging data with the unmanned aerial vehicle in real time, and the TTL communication circuit is connected to the microcontroller circuit and is communicatively connected to an unmanned aerial vehicle communication module in the unmanned aerial vehicle.

4. The fuel cell control system for the unmanned aerial vehicle of claim 1 or 2, further comprising a stack voltage sensor, a stack current sensor, a stack temperature sensor, a lithium battery voltage sensor and a lithium battery current sensor, wherein the stack voltage sensor, the stack current sensor and the stack temperature sensor are respectively connected to a stack in the fuel cell, and the lithium battery voltage sensor and the lithium battery current sensor are respectively connected to the lithium battery;

the main control unit is also integrated with a data acquisition and control circuit which is respectively connected with the galvanic pile voltage sensor, the galvanic pile current sensor, the galvanic pile temperature sensor, the lithium battery voltage sensor and the lithium battery current sensor.

5. The fuel cell control system for unmanned aerial vehicle of claim 4, wherein the fuel cell control system further comprises a hydrogen supply module and a hydrogen concentration sensor, which are respectively connected with the fuel cell and the data acquisition and control circuit.

6. The fuel cell control system for unmanned aerial vehicle of claim 5, wherein the data acquisition and control circuit comprises: voltage monitoring circuit, current monitoring circuit, temperature monitoring circuit, pressure monitoring circuit and valve body control circuit, voltage monitoring circuit is connected with fuel cell and lithium cell respectively, current monitoring circuit is connected with fuel cell and lithium cell respectively, and temperature monitoring circuit is connected with fuel cell, and pressure monitoring circuit is connected with hydrogen cylinder in the module that supplies hydrogen, and valve body control circuit advances the hydrogen battery valve with the module that supplies hydrogen and arranges the hydrogen battery valve and be connected.

7. The fuel cell control system for unmanned aerial vehicle of claim 4, wherein the fuel cell control system further comprises a start-stop switch connected with the data acquisition and control circuit.

8. The fuel cell control system for unmanned aerial vehicle of claim 1, 2, 5, 6 or 7, wherein the fuel cell isolation circuit and the lithium battery isolation circuit each comprise: the negative electrode of a light emitting diode in the photoelectric coupler is connected with a microcontroller circuit, the emitting electrode of the photosensitive triode is respectively connected with the bases of the N-type triode and the P-type triode, the emitting electrode of the N-type triode and the emitting electrode of the P-type triode are further connected with the G electrode of the NMOS tube after being connected, the positive electrode of the first isolation diode is connected with the S electrode of the NMOS tube, the D electrode of the NMOS tube is connected with the input end of the fuel cell/lithium cell, and the positive electrode of the first isolation diode is connected with the output end of the fuel cell/lithium cell.

9. The fuel cell control system for the unmanned aerial vehicle of claim 1, 2, 5, 6 or 7, wherein the fuel cell performance recovery circuit comprises 4 NMOS transistors, namely a first NMOS transistor, a second NMOS transistor, a third NMOS transistor and a fourth NMOS transistor, wherein the G pole of the first NMOS transistor and the G pole of the second NMOS transistor are connected and connected with the microcontroller circuit, the S pole of the first NMOS transistor and the D pole of the second NMOS transistor are connected, the G pole of the third NMOS transistor and the G pole of the fourth NMOS transistor are connected and connected with the microcontroller circuit, the S pole of the third NMOS transistor and the D pole of the fourth NMOS transistor are connected, the D pole of the first NMOS transistor and the D pole of the third NMOS transistor are connected and connected with the positive electrode of the fuel cell, and the S pole of the second NMOS transistor and the S pole of the fourth NMOS transistor are connected and connected with the negative electrode of the fuel cell.

10. The fuel cell control system for the unmanned aerial vehicle of claim 2, wherein the charging circuit comprises a fuse, a voltage stabilizing chip, a second isolation diode, a current limiting resistor, a first voltage dividing resistor and a second voltage dividing resistor, wherein the fuse is connected with an input end of the voltage stabilizing chip, and an anode of the second isolation diode is connected with an output end of the voltage stabilizing chip through the current limiting resistor; the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series, one end of the series connection is connected between the current-limiting resistor and the second isolation diode, the other end of the series connection is grounded, and the voltage regulation end of the voltage-stabilizing chip is connected between the first voltage-dividing resistor and the second voltage-dividing resistor.