Signal control circuit applied to parachute opening controller

Abstract

The invention discloses a signal control circuit applied to a parachute opening controller, which is used for activating an action response component electrically connected to the parachute opening controller, the action response component comprises a steering engine and / or a gas generator, and the signal control circuit comprises a single chip microcomputer, a power supply module, a sensing module, an activation module and a heating module, the power supply module supplies power to the single-chip microcomputer, the sensing module, the activation module and the heating module. The activation module is electrically connected to the action response component; the single-chip microcomputer collects external environment information through the sensing module, and when the external environment information meets the parachute opening condition, the activation module is controlled to activate the action response component. Wherein the heating module comprises a heating circuit and a graphene flexible electrothermal film; and the heating circuit supplies power to the graphene flexible electrothermal film, so that the graphene flexible electrothermal film is electrified to heat. According to the signal control circuit applied to the parachute opening controller, a powerful guarantee is provided for safe operation of the parachute opening controller in an extreme environment through the heating module.

Description

Technical Field

[0001] This invention belongs to the field of umbrella opening controller technology, and specifically relates to a signal control circuit applied to an umbrella opening controller. Background Technology

[0002] Parachute deployers, as a critical electronic control device, are widely used in the aerospace field. They are used to precisely control various systems of an aircraft, such as engine ignition, flight attitude adjustment, and the activation and deactivation of onboard equipment. These systems have extremely high requirements for the accuracy and reliability of timing control to ensure the smooth execution of flight missions and the safe operation of the aircraft.

[0003] However, in aerospace missions, aircraft may face extreme low-temperature environments, such as high-altitude flights. Under such conditions, the performance of the electronic components inside the parachute deployment controller degrades significantly. For example, the parameters of components such as resistors and capacitors on the circuit board may change, leading to signal transmission delays or distortions; the carrier mobility of semiconductor devices decreases, affecting their switching speed and conduction performance. These problems can cause the parachute deployment controller to malfunction, or even trigger system failures, posing a serious threat to flight safety. Summary of the Invention

[0004] The main objective of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a signal control circuit for an umbrella opening controller, thereby solving the problems in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a signal control circuit for a parachute opening controller, used to activate an action response component electrically connected to the parachute opening controller. The action response component includes a servo motor and / or a gas generator. The signal control circuit includes a microcontroller, a power module, a sensing module, an activation module, and a heating module. The power module supplies power to the microcontroller, the sensing module, the activation module, and the heating module. The activation module is electrically connected to the action response component. The microcontroller collects external environmental information through the sensing module, and when the external environmental information meets the parachute opening conditions, it controls the activation module to activate the action response component. The heating module includes a heating circuit and a graphene flexible electrothermal film. The heating circuit is electrically connected to the power supply module, and the graphene flexible electrothermal film is electrically connected to the heating circuit. When the external temperature is lower than the preset low temperature threshold of the heating module, the heating circuit responds and supplies power to the graphene flexible electrothermal film so that the graphene flexible electrothermal film is energized and heats up.

[0006] Optionally, the power module includes a battery connector and a transformer circuit. The battery connector is used to electrically connect to a battery, and the transformer circuit is electrically connected to the battery connector. The battery connector outputs a first voltage for the activation module to operate, and the transformer circuit converts the first voltage to output a second voltage for the heating module to operate, a third voltage for the sensing module to operate, and a fourth voltage for the microcontroller to operate.

[0007] Optionally, the transformer circuit includes a first step-down circuit for forming the second voltage, a second step-down circuit for forming the third voltage, and a third step-down circuit for forming the fourth voltage.

[0008] Optionally, the power module further includes: a charging connector, a fast charging protocol circuit, and a charging protection circuit; The fast charging protocol circuit is electrically connected to the charging connector and is used to communicate and handshake with the host computer of the charger when the charging connector is connected to the charger, so that the charger provides a preset charging voltage to the charging connector. The charging protection circuit is electrically connected to the charging connector and the battery connector, and is used to form a charging circuit between the charging connector and the battery connector, and to stop charging when the battery electrically connected to the battery connector overheats or is charged to a preset limit.

[0009] Optionally, the charging protection circuit includes: a battery management chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, a first light-emitting diode, a second light-emitting diode, a first diode, and a second inductor; The third resistor and the fourth resistor are electrically connected together to the battery management chip, and the third resistor is also electrically connected to the charging connector; The fourth resistor is also electrically connected to the positive terminal of the first LED and the positive terminal of the second LED. The negative terminal of the first LED is electrically connected to the fourteenth pin of the battery management chip, and the negative terminal of the second LED is electrically connected to the fifteenth pin of the battery management chip. One end of the fifth resistor, one end of the sixth resistor, and the battery connector are all electrically connected to the eleventh pin of the battery management chip. The sixth resistor and the third capacitor are also electrically connected to the tenth and thirteenth pins of the battery management chip. One end of the seventh resistor is electrically connected to the twelfth pin of the battery management chip; The cathode of the first diode and one end of the second inductor are electrically connected to the second and third pins of the battery management chip. The second inductor is also connected to the eighth pin of the battery management chip and one end of the eighth resistor. The eighth resistor is also electrically connected to the ninth pin of the battery management chip and the battery connector.

[0010] Optionally, the signal control circuit further includes a power-on unit, which includes a button connector and a power-on circuit. The button connector is used to electrically connect to a power-on button, and the power-on circuit is electrically connected to the button connector, the microcontroller, and the transformer circuit. When the power-on button, which is electrically connected to the button connector, is pressed, the power-on circuit responds and wakes up the microcontroller, and starts the transformer circuit to output the second voltage, the third voltage, and the fourth voltage.

[0011] Optionally, the power-on circuit includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fourth capacitor, a second diode, a third diode, a fourth diode, a fifth diode, and a first P-channel enhancement-mode MOSFET. One end of the ninth resistor, one end of the tenth resistor, one end of the fourth capacitor, and the gate of the first P-channel enhancement-mode field-effect transistor are electrically connected to the button connector, and the other end of the tenth resistor and the drain of the first P-channel enhancement-mode field-effect transistor are electrically connected to the battery connector. The source of the first P-channel enhancement-mode MOSFET is electrically connected to one end of the eleventh resistor, and the other end of the eleventh resistor, the cathode of the second diode, one end of the twelfth resistor, and the anode of the third diode are all electrically connected to the microcontroller. One end of the thirteenth resistor and the positive terminal of the fourth diode are electrically connected to the microcontroller; one end of the fourteenth resistor and one end of the fifteenth resistor are electrically connected to the fifth diode; and the other end of the fifteenth resistor is electrically connected to the charging connector. The cathodes of the third diode, the fourth diode, and the fifth diode, along with one end of the sixteenth resistor, are electrically connected to the step-down DC-DC power supply chip.

[0012] Optionally, the signal control circuit further includes a power indicator circuit, which is electrically connected to the microcontroller, the charging connector, and the battery connector. When the charging connector has a charging voltage, the power indicator circuit indicates the battery power connected to the battery connector; or, when the power button is pressed, the microcontroller drives the power indicator circuit to indicate the battery power connected to the battery connector.

[0013] Optionally, the power indicator circuit includes: a voltage reference chip, a sixth diode, a seventh diode, an eighth diode, a third light-emitting diode, a fourth light-emitting diode, a fifth light-emitting diode, and a sixth light-emitting diode; When the battery charge connected to the battery connector is less than 1 / 4, the third LED is lit, and the fourth, fifth, and sixth LEDs are off; when the battery charge connected to the battery connector is greater than 1 / 4 and less than 1 / 2, the third and fourth LEDs are lit, and the fifth and sixth LEDs are off; when the battery charge connected to the battery connector is greater than 1 / 2 and less than 3 / 4, the third, fourth, and fifth LEDs are lit, and the sixth LED is off; when the battery charge connected to the battery connector is greater than 3 / 4, all three LEDs are lit.

[0014] Optionally, the heating circuit includes: a comparator, a 31st resistor, a 32nd resistor, a 33rd resistor, a 34th resistor, a 35th resistor, a 36th resistor, a 37th resistor, a 38th resistor, a third P-channel enhancement-mode field-effect transistor, and a second N-channel enhancement-mode field-effect transistor. The source of the third P-channel enhancement-mode field-effect transistor is electrically connected to the graphene flexible electrothermal film. The drain of the third P-channel enhancement-mode field-effect transistor, one end of the thirty-first resistor, the other end of the first inductor, the other end of the first resistor, and the other end of the second capacitor are all electrically connected together. The other end of the thirty-first resistor and the gate of the third P-channel enhancement-mode field-effect transistor are all electrically connected to the drain of the second N-channel enhancement-mode field-effect transistor. One end of the thirty-second resistor and one end of the thirty-third resistor are all electrically connected to the gate of the second N-channel enhancement-mode field-effect transistor. The other end of the thirty-second resistor and the source of the second N-channel enhancement-mode field-effect transistor are all grounded. The other end of the thirty-third resistor and one end of the thirty-fourth resistor are connected to the fourth pin of the comparator, and the other end of the thirty-fourth resistor and the fifth pin of the comparator are electrically connected to the second pin of the second linear regulator; the second pin of the comparator is grounded. One end of the thirty-fifth resistor and one end of the thirty-sixth resistor are electrically connected to the first pin of the comparator, the other end of the thirty-fifth resistor is electrically connected to the second pin of the second linear regulator, and the other end of the thirty-sixth resistor is grounded. One end of the thirty-seventh resistor and one end of the thirty-eighth resistor are electrically connected to the third pin of the comparator, the other end of the thirty-seventh resistor is electrically connected to the second pin of the second linear regulator, and the other end of the thirty-eighth resistor is grounded; The thirty-sixth resistor is a thermistor, the thirty-fifth resistor has the same resistance value as the thirty-seventh resistor, and the thirty-eighth resistor has the same resistance value as the thirty-sixth resistor at the low temperature threshold.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The signal control circuit of the parachute opening controller of the present invention, by setting up a graphene flexible electrothermal film and a heating circuit, can heat the inside of the parachute opening controller, effectively increasing the internal ambient temperature, preventing the electronic components in the signal control circuit from degrading due to low temperature, ensuring that the parachute opening controller can still operate stably and reliably in low temperature environment, meeting the high requirements of the aerospace field for parachute opening controllers, and providing strong protection for the safe operation of aircraft in extreme environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below.

[0017] Figure 1 This is a partial structural diagram of the power module of the signal control circuit applied to the umbrella opening controller in an embodiment of the present invention; Figure 2 This is a schematic diagram of the fast charging protocol circuit applied to the signal control circuit of the umbrella opening controller according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the power-on circuit of the signal control circuit applied to the umbrella opening controller according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the heating circuit of the signal control circuit applied to the umbrella opening controller according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the air pressure measurement circuit applied to the signal control circuit of the umbrella opening controller according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the inertial measurement circuit of the signal control circuit applied to the umbrella opening controller according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the activation module of the signal control circuit applied to the umbrella opening controller in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Please see Figures 1 to 7 This invention provides a signal control circuit for a parachute deployment controller, used to activate an action response component electrically connected to the parachute deployment controller. The action response component includes a servo motor and / or a gas generator. The signal control circuit includes a microcontroller U1, a power supply module, a sensing module, an activation module, and a heating module. The power supply module supplies power to the microcontroller U1, the sensing module, the activation module, and the heating module. The activation module is electrically connected to the action response component. The microcontroller U1 collects external environmental information through the sensing module. When the external environmental information meets the parachute deployment conditions, it controls the activation module to activate the action response component. The heating module includes a heating circuit and a graphene flexible electrothermal film. The heating circuit is electrically connected to the power supply module, and the graphene flexible electrothermal film is electrically connected to the heating circuit. When the external temperature is lower than a preset low-temperature threshold of the heating module, the heating circuit responds and supplies power to the graphene flexible electrothermal film, causing the graphene flexible electrothermal film to generate heat. It should be emphasized that the signal control circuit of this embodiment is applied to a parachute deployment controller, which is applied to an aircraft. The aircraft can be a fixed-wing aircraft or a multi-rotor aircraft, and can be a manned aircraft or an unmanned aircraft.

[0026] like Figure 1As shown, the power supply module includes: a battery connector J1 and a transformer circuit. The battery connector J1 is used to electrically connect to the battery. The transformer circuit is electrically connected to the battery connector J1. The battery connector J1 outputs a first voltage VBAT for the activation module to work. The transformer circuit converts the first voltage VBAT and outputs a second voltage VCC1 for the heating module to work, a third voltage VCC2 for the sensing module to work, and a fourth voltage VDD for the microcontroller U1 to work.

[0027] Preferably, the battery connector J1 in this embodiment includes a first pin VABT, a second pin NTC, and a third pin GND. The battery adapted to the battery connector J1 includes a battery with temperature monitoring. This type of battery monitors its temperature in real time through a built-in temperature sensor (such as an NTC thermistor) and feeds the data back to the battery management system (BMS) to achieve intelligent management and protection of the battery. It is understood that the transformer circuit can boost or buck the first voltage VBAT output by the battery connector J1. In this embodiment, the first voltage VBAT is converted to output a second voltage VCC1 for the heating module, a third voltage VCC2 for the sensing module, and a fourth voltage VDD for the microcontroller U1. However, this is a setting based on the fact that the heating module, sensing module, and microcontroller U1 operate at different voltages in this embodiment. In other embodiments, the transformer circuit can convert the first voltage VBAT to any voltage output different from the first voltage VBAT to adapt to the voltage requirements of other circuits.

[0028] Furthermore, the transformer circuit includes a first step-down circuit for forming the second voltage VCC1. The first step-down circuit includes: a step-down DC-DC power chip U2, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, and a first inductor L1. A battery connector J1 is electrically connected to the third pin of the step-down DC-DC power chip U2. One end of the first capacitor C1 is electrically connected to the sixth pin of the step-down DC-DC power chip U2, and the other end not connected to the sixth pin of the step-down DC-DC power chip U2 is electrically connected to the... The second pin and one end of the first inductor L1; one end of the first resistor R1, one end of the second capacitor C2, and one end of the second resistor R2 are all electrically connected to the fourth pin of the step-down DC-DC power chip U2. The end of the second resistor R2 not connected to the step-down DC-DC power chip is grounded. The ends of the first inductor L1 not connected to the step-down DC-DC power chip, the ends of the first resistor R1 not connected to the step-down DC-DC power chip, and the ends of the second capacitor C2 not connected to the step-down DC-DC power chip, when electrically connected, collectively output the second voltage VCC1. The first voltage VBAT output from the battery connector is converted by the first step-down circuit to output the second voltage VCC1, which powers the heating module. The step-down DC-DC power chip U2 adjusts the duty cycle through its internal power switch and control circuit to achieve the step-down function. Simultaneously, the inductor L1 and capacitors C1 and C2 act as filters, making the output voltage more stable.

[0029] The transformer circuit also includes a second step-down circuit for forming the third voltage VCC2. The second step-down circuit includes a first linear regulator U3. The other end of the first inductor L1, the other end of the first resistor R1, and the other end of the second capacitor C2 are all electrically connected to the third pin of the first linear regulator U3. The first pin of the first linear regulator U3 is grounded, and the second pin of the first linear regulator U3 outputs the third voltage VCC2. The transformer circuit also includes a third buck circuit for forming a fourth voltage VDD. The third buck circuit includes a second linear regulator U4. The other end of the first inductor L1, the other end of the first resistor R1, and the other end of the second capacitor C2 are electrically connected to the third pin of the second linear regulator U4. The first pin of the second linear regulator U4 is grounded, and the second pin of the second linear regulator U4 outputs the fourth voltage VDD.

[0030] The power module also includes: a charging connector J2, a fast charging protocol circuit, and a charging protection circuit; the fast charging protocol circuit is electrically connected to the charging connector J2 and is used to communicate and handshake with the host computer of the charger when the charging connector J2 is connected to the charger, so that the charger provides a preset charging voltage to the charging connector J2; the charging protection circuit is electrically connected to the charging connector J2 and the battery connector J1 and is used to form a charging circuit between the charging connector J2 and the battery connector J1, and to stop charging when the battery electrically connected to the battery connector J1 overheats or is charged to a preset limit.

[0031] Furthermore, the charging protection circuit includes: a battery management chip U5, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, a first light-emitting diode LED1, a second light-emitting diode LED2, a first diode D1, and a second inductor L2; one end of the third resistor R3 and one end of the fourth resistor R4 are electrically connected to the first, fourth, fifth, and sixteenth pins of the battery management chip U5, and the other end of the third resistor R3 is electrically connected to the charging connector J2; the other end of the fourth resistor R4 is electrically connected to the positive terminal of the first light-emitting diode LED1 and the positive terminal of the second light-emitting diode LED2, the negative terminal of the first light-emitting diode LED1 is electrically connected to the fourteenth pin of the battery management chip U5, and the negative terminal of the second light-emitting diode LED2 is electrically connected to the fifteenth pin of the battery management chip U5; the fifth resistor R5... One end of the fifth resistor R6, one end of the sixth resistor R6, and the battery connector J1 are electrically connected to the eleventh pin of the battery management chip U5. The other end of the fifth resistor R5 is grounded. The other end of the sixth resistor R6 and one end of the third capacitor C3 are electrically connected to the tenth and thirteenth pins of the battery management chip U5. The other end of the third capacitor C3 is grounded. One end of the seventh resistor R7 is electrically connected to the twelfth pin of the battery management chip U5. The other end of the seventh resistor R7 is grounded. The cathode of the first diode D1 and one end of the second inductor L2 are electrically connected to the second and third pins of the battery management chip U5. The anode of the first diode D1 is grounded. The other end of the second inductor L2 is connected to the eighth pin of the battery management chip U5 and one end of the eighth resistor R8. The other end of the eighth resistor R8 is electrically connected to the ninth pin of the battery management chip U5 and the battery connector J1. The seventh and seventeenth pins of the battery management chip U5 are grounded.

[0032] Furthermore, the charging protection circuit also includes a boost circuit connected in series between the other end of the third resistor R3 and the charging connector J2. The boost circuit includes: a first boost-type DC-DC power chip U6, a thirty-ninth resistor R39, a fortieth resistor R40, a forty-first resistor R41, a forty-second resistor R42, a forty-third resistor R43, a forty-fourth resistor R44, a forty-fifth resistor R45, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a ninth diode D9, a third inductor L3, and a TVS diode. TVS1 and fuse F1 are connected together. One end of TVS1 and one end of fuse F1 are electrically connected to the first pin of charging connector J2. The other end of TVS1 is grounded. One end of the sixth capacitor C6, one end of the seventh capacitor C7, one end of the third inductor L3, and the ninth pin of the first boost DC-DC power chip U6 are electrically connected to the other end of fuse F1. The other ends of the sixth capacitor C6 and the seventh capacitor C7 are grounded together. The other end of the third inductor L3, one end of the thirty-ninth resistor R39, and one end of the ninth capacitor C9 are electrically connected to the eleventh pin of the first boost DC-DC power chip U6. The other end of resistor R39 is electrically connected to the first pin of the first boost DC-DC power chip U6; the other end of capacitor C9 is electrically connected to the tenth pin of the first boost DC-DC power chip U6; one end of capacitor C8 is electrically connected to the second pin of the first boost DC-DC power chip U6, and the other end is grounded; one end of resistor R40 is electrically connected to the other end of fuse F1; the other end of resistor R40, the negative terminal of diode D9, and one end of resistor R41 are all electrically connected to the seventh pin of the first boost DC-DC power chip U6; the positive terminal of diode D9 and the positive terminal of resistor R41 are connected to the... The other end is grounded together. The ninth diode D9 is a Zener diode. One end of the eleventh capacitor C11, one end of the twelfth capacitor C12, one end of the thirteenth capacitor C13, one end of the forty-second resistor R42, and the other end of the third resistor R3 are all electrically connected to the sixth pin of the first boost DC-DC power chip U6. The other end of the eleventh capacitor C11, the other end of the twelfth capacitor C12, and the other end of the thirteenth capacitor C13 are all grounded together. The other end of the forty-second resistor R42 and one end of the forty-third resistor R43 are all electrically connected to the third pin of the first boost DC-DC power chip U6. The other end of the forty-third resistor R43 is grounded.One end of the forty-fourth resistor R44 is electrically connected to the fourth pin of the first boost DC-DC power chip U6. The other end of the forty-fourth resistor R44 is electrically connected to one end of the tenth capacitor C10. The other end of the tenth capacitor C10 and one end of the forty-fifth resistor R45 are jointly connected to the fifth pin of the first boost DC-DC power chip U6. The fifth pin of the first boost DC-DC power chip U6 is grounded. The other end of the forty-fifth resistor R45 is electrically connected to the eighth pin of the first boost DC-DC power chip U6.

[0033] In some embodiments, the fast charging protocol circuit of this application includes: a fast charging protocol chip U7, an anti-static protector U8, a forty-sixth resistor R46, a forty-seventh resistor R47, a forty-eighth resistor R48, a forty-ninth resistor R49, a fiftieth resistor R50, a fifty-first resistor R51, a fifty-second resistor R52, and a fourteenth capacitor C14. Specifically, as shown... Figure 2 As shown, one end of the 46th resistor R46 and one end of the 47th resistor R47 are both grounded. The other end of the 46th resistor R46 is electrically connected to the third pin of the fast charging protocol chip U7, and the other end of the 47th resistor R47 is electrically connected to the second pin of the fast charging protocol chip U7. One end of the 48th resistor R48 and one end of the 14th capacitor C14 are both electrically connected to the first pin of the fast charging protocol chip U7. The other end of the 48th resistor R48 is electrically connected to the other end of the fuse F1, and the other end of the 14th capacitor C14 is grounded. One end of the 49th resistor R49 is electrically connected to the ninth pin of the fast charging protocol chip U7, and the other end of the 49th resistor R49 is grounded. One end of the 50th resistor R50 is electrically connected to the eighth pin of the fast charging protocol chip U7, and the other end of the 50th resistor R50 is electrically connected to the other end of the fuse F1. (Fast charging protocol...) The fourth and fifth pins of chip U7 are electrically connected; one end of resistor 51 and one end of resistor 52 are grounded together, the other end of resistor 51 is electrically connected to the seventh pin of anti-static protector U8, and the other end of resistor 52 is electrically connected to the sixth pin of anti-static protector U8; wherein, the seventh pin of fast charging protocol chip U7, the fourth and seventh pins of anti-static protector U8 are electrically connected to the third pin of charging connector J2, the sixth pin of fast charging protocol chip U7, the fifth and sixth pins of anti-static protector U8 are electrically connected to the fourth pin of charging connector J2; the second and ninth pins of anti-static protector U8 are electrically connected to the sixth pin of charging connector J2; the first and tenth pins of anti-static protector U8 are electrically connected to the fifth pin of charging connector J2. Among them, the resistance values ​​of the forty-sixth resistor R46 and the forty-seventh resistor R47 are 0, the resistance value of the forty-eighth resistor R48 is 1K, the resistance value of the forty-ninth resistor R49 is 0, and the resistance value of the fiftieth resistor R50 is 10K. Therefore, the requested voltage of the fast charging protocol chip U7 is 9V.

[0034] Furthermore, the signal control circuit also includes a power-on unit, which includes a button connector J3 and a power-on circuit. The button connector J3 is used to electrically connect to the power-on button, and the power-on circuit is electrically connected to the button connector J3, the microcontroller U1, and the transformer circuit. When the power-on button connected to the button connector J3 is pressed, the power-on circuit responds and wakes up the microcontroller U1, starting the transformer circuit to output the second voltage VCC1, the third voltage VCC2, and the fourth voltage VDD.

[0035] like Figure 3 As shown, the power-on circuit includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fourth capacitor C4, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a first P-channel enhancement-mode MOSFET Q1; one end of the ninth resistor R9, one end of the tenth resistor R10, one end of the fourth capacitor C4, and the gate of the first P-channel enhancement-mode MOSFET Q1 are electrically connected to the button connector J3; the other end of the ninth resistor R9 and the other end of the fourth capacitor C4 are grounded together; the other end of the tenth resistor R10 and the drain of the first P-channel enhancement-mode MOSFET Q1 are electrically connected to the battery connector J1; the source of the first P-channel enhancement-mode MOSFET Q1 is electrically connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the first P-channel enhancement-mode MOSFET Q1. The cathode of diode D2, one end of resistor R12, and the anode of diode D3 are connected to pin 28 of microcontroller U1. The anode of diode D2 and the other end of resistor R12 are grounded. One end of resistor R13 and the anode of diode D4 are connected to pin 25 of microcontroller U1. The other end of resistor R13 is grounded. One end of resistor R14 and one end of resistor R15 are connected to the anode of diode D5. The other end of resistor R14 is grounded. The other end of resistor R15 is connected to charging connector J2. Specifically, the other end of resistor R15 is connected to the other end of fuse F1. The cathodes of diodes D3, D4, and D5, and one end of resistor R16 are connected to pin 5 of step-down DC-DC power chip U2. Diode D2 is a Zener diode.

[0036] Furthermore, the signal control circuit also includes a power indicator circuit, which is electrically connected to the microcontroller U1, the charging connector J2, and the battery connector J1. When the charging connector J2 has a charging voltage, the power indicator circuit indicates the battery level of the battery connected to the battery connector J1. Alternatively, when the power button is pressed, the microcontroller U1 drives the power indicator circuit to indicate the battery level of the battery connected to the battery connector J1.

[0037] Furthermore, the power indicator circuit includes: a voltage reference chip U9, a first operational amplifier U10, a second operational amplifier U11, a third operational amplifier U12, a fourth operational amplifier U13, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a fifth capacitor C5, a sixth diode D6, a seventh diode D7, and an eighth diode D8. 8. LED3 (third), LED4 (fourth), LED5 (fifth), LED6 (sixth), Q2 (second P-channel enhancement-mode MOSFET), Q3 (first N-channel enhancement-mode MOSFET); the positive terminal of the sixth diode D6 is electrically connected to the charging connector J2, specifically, the positive terminal of the sixth diode D6 is electrically connected to the other end of fuse F1; the positive terminal of the seventh diode D7 is electrically connected to the 28th pin of microcontroller U1; the negative terminals of the sixth diode D6 and the seventh diode D7 are electrically connected to one end of the 17th resistor R17; the other end of the 17th resistor R17 and one end of the 18th resistor R18 are electrically connected to the second P-channel enhancement-mode MOSFET. The gate of transistor Q2, the other end of the eighteenth resistor R18, and the source of the second P-channel enhancement-mode MOSFET Q2 are all grounded. One end of the nineteenth resistor R19 and the negative terminal of the eighth diode D8 are electrically connected to the drain of the second P-channel enhancement-mode MOSFET Q2. The other end of the nineteenth resistor R19, the positive terminal of the eighth diode D8, and one end of the twentieth resistor R20 are all electrically connected to the gate of the first N-channel enhancement-mode MOSFET Q3. The other end of the twentieth resistor R20 and the drain of the first N-channel enhancement-mode MOSFET Q3 are all electrically connected to battery connector J1. One end of the fifth capacitor C5, one end of the twenty-first resistor R21, and one end of the twenty-second resistor R22 are all electrically connected to the first N-channel enhancement-mode MOSFET Q3. The source of the enhancement-mode MOSFET Q3 is connected to the source of the fifth capacitor C5, and the other end of the fifth capacitor C5 is grounded. The other end of the twenty-second resistor R22 and one end of the twenty-third resistor R23 are connected together to the third pin of the first operational amplifier U10. The other end of the twenty-third resistor R23 and one end of the twenty-fourth resistor R24 ​​are connected together to the fifth pin of the second operational amplifier U11. The other end of the twenty-fourth resistor R24 ​​and one end of the twenty-fifth resistor R25 are connected together to the tenth pin of the third operational amplifier U12. The other end of the twenty-fifth resistor R25 and one end of the twenty-sixth resistor R26 are connected together to the twelfth pin of the fourth operational amplifier U13. The other end of the twenty-sixth resistor R26 is grounded.The other end of the twenty-first resistor R21 is electrically connected to the first pin of voltage reference chip U9, the second pin of voltage reference chip U9, the second pin of the first operational amplifier U10, the sixth pin of the second operational amplifier U11, the ninth pin of the third operational amplifier U12, and the thirteenth pin of the fourth operational amplifier U13, respectively; the third pin of voltage reference chip U9 is grounded; the fourth pin of the first operational amplifier U10 is electrically connected to the source of the second P-channel enhancement-mode MOSFET Q2; the eleventh pin of the first operational amplifier U10 is grounded; the first pin of the first operational amplifier U10 is electrically connected to one end of the twenty-seventh resistor R27; the other end of the twenty-seventh resistor R27 is electrically connected to the positive terminal of the third light-emitting diode LED3. The negative terminal of diode LED3 is grounded; the seventh pin of the second operational amplifier U11 is electrically connected to one end of the twenty-eighth resistor R28, and the other end of the twenty-eighth resistor R28 is electrically connected to the positive terminal of the fourth LED4, and the negative terminal of the fourth LED4 is grounded; the eighth pin of the third operational amplifier U12 is electrically connected to one end of the twenty-ninth resistor R29, and the other end of the twenty-ninth resistor R29 is electrically connected to the positive terminal of the fifth LED5, and the negative terminal of the fifth LED5 is grounded; the fourteenth pin of the fourth operational amplifier U13 is electrically connected to one end of the thirtieth resistor R30, and the other end of the thirtieth resistor R30 is electrically connected to the positive terminal of the sixth LED6, and the negative terminal of the sixth LED6 is grounded; When the battery charge connected to battery connector J1 is less than 1 / 4, LED3 (third LED) is on, while LED4, LED5, and LED6 are off. When the battery charge connected to battery connector J1 is greater than 1 / 4 but less than 1 / 2, LED3 and LED4 are on, while LED5 and LED6 are off. When the battery charge connected to battery connector J1 is greater than 1 / 2 but less than 3 / 4, LED3, LED4, and LED5 are on, while LED6 is off. When the battery charge connected to battery connector J1 is greater than 3 / 4, all LEDs are on.

[0038] like Figure 4As shown, the heating circuit includes: comparator U14, resistors R31 (31st), R32 (32nd), R33 (33rd), R34 (34th), R35 (35th), R36 (36th), R37 (37th), R38 (38th), a third P-channel enhancement-mode MOSFET Q4, a second N-channel enhancement-mode MOSFET Q5, the source of the third P-channel enhancement-mode MOSFET Q4 being electrically connected to the graphene flexible heating film, and the drain of the third P-channel enhancement-mode MOSFET Q4 being connected to the thirty-first resistor. One end of resistor R31, the other end of the first inductor L1, the other end of the first resistor R1, and the other end of the second capacitor C2 are electrically connected together; the other end of the thirty-first resistor R31 and the gate of the third P-channel enhancement-mode field-effect transistor Q4 are electrically connected together to the drain of the second N-channel enhancement-mode field-effect transistor Q5; one end of the thirty-second resistor R32 and one end of the thirty-third resistor R33 are electrically connected together to the gate of the second N-channel enhancement-mode field-effect transistor Q5; the other end of the thirty-second resistor R32 and the source of the second N-channel enhancement-mode field-effect transistor Q5 are connected together. The three resistors are grounded together; the other end of the thirty-third resistor R33 and one end of the thirty-fourth resistor R34 are connected to the fourth pin of comparator U14, and the other end of the thirty-fourth resistor R34 and the fifth pin of comparator U14 are connected to the second pin of the second linear regulator U4; the second pin of comparator U14 is grounded; one end of the thirty-fifth resistor R35 and one end of the thirty-sixth resistor R36 are connected to the first pin of comparator U14, and the other end of the thirty-fifth resistor R35 is connected to the second pin of the second linear regulator U4; the other end of the thirty-sixth resistor R36 is grounded; one end of the thirty-seventh resistor R37 and one end of the thirty-eighth resistor R38 are connected to the third pin of comparator U14, and the other end of the thirty-seventh resistor R37 is connected to the second pin of the second linear regulator U4; the other end of the thirty-eighth resistor R38 is grounded; among them, the thirty-sixth resistor R36 is a thermistor, the resistance of the thirty-fifth resistor R35 is the same as that of the thirty-seventh resistor R37, and the resistance of the thirty-eighth resistor R38 is the same as that of the thirty-sixth resistor R36 at the low temperature threshold. Preferably, the resistance of the thirty-sixth resistor R36 gradually increases as the temperature decreases between 0°C and -40°C.

[0039] Optionally, in one embodiment of the present invention, the low-temperature threshold is -25°C. In this embodiment, the 35th resistor R35 and the 36th resistor R36 form a voltage divider circuit to convert temperature changes into voltage changes. The resistance of the 36th resistor R36, acting as a thermistor, changes with temperature, thereby changing the voltage division ratio and making the voltage at the first pin of comparator U14 reflect the current ambient temperature. The 37th resistor R37 and the 38th resistor R38 form another voltage divider circuit to provide a reference voltage for comparator U14. By selecting a suitable value for the 38th resistor R38, the reference voltage corresponding to the low-temperature threshold can be set. Specifically, the resistance of the 36th resistor R36 increases as the temperature decreases. When the ambient temperature decreases, the resistance of the 36th resistor R36 increases, causing a change in the voltage division ratio and increasing the voltage at the first pin of comparator U14. Comparator U14 compares the voltage states of its first and third pins in real time. If the voltage at the first pin of comparator U14 is higher than the voltage at the third pin, it indicates that the current ambient temperature is below the low temperature threshold, and comparator U14 outputs a high level to trigger the heating function; if the voltage at the first pin of comparator U14 is lower than the voltage at the third pin, it indicates that the current ambient temperature is above the low temperature threshold, and comparator U14 outputs a low level to stop the heating function.

[0040] In some embodiments, such as Figure 5 and Figure 6 As shown, the sensing module includes a barometric pressure measurement circuit and an inertial measurement circuit. The barometric pressure measurement circuit calculates the altitude or altitude change of the parachute controller by measuring the air pressure, while the inertial measurement circuit measures the current attitude or attitude change of the parachute controller. In this embodiment, the barometric pressure measurement circuit uses a barometer U15 in conjunction with a level shifter U16 of model RS0102YH8, electrically connected to pins 61 and 62 of the microcontroller U1. The inertial measurement circuit uses an attitude sensor U17 in conjunction with a level shifter U18, electrically connected to pins 33, 34, 35, and 36 of the microcontroller U1.

[0041] In some embodiments, such as Figure 7As shown, the activation module includes an activation circuit, which comprises: a second boost DC-DC power chip U19, a current sensing amplifier U20, a 53rd resistor R53, a 54th resistor R54, a 55th resistor R55, a 56th resistor R56, a 57th resistor R57, a 58th resistor R58, a 59th resistor R59, a 15th capacitor C15, a 16th capacitor C16, a 17th capacitor C17, and a fourth inductor L4. One end of the fourth inductor L4 is electrically connected to the first pin of the battery connector J1 via a common connection to the ninth pin of the second boost DC-DC power chip U19. The other end of the fourth inductor L4 is connected to the 53rd resistor R54, a 55th resistor R55, a 56th resistor R56, a 57th resistor R57, a 58th resistor R58, a 59th resistor R59, a 15th capacitor C15, a 16th capacitor C16, a 17th capacitor C17, and a 58th capacitor C17. One end of resistor R53 and one end of capacitor C15 are electrically connected to pin 11 of the second boost DC-DC power chip U19. The other end of capacitor C15 is electrically connected to pin 10 of the second boost DC-DC power chip U19. The other end of resistor R53 is electrically connected to pin 1 of the second boost DC-DC power chip U19. One end of capacitor C16 is connected to pin 2 of the second boost DC-DC power chip U19. One end of resistor R54 and pin 7 of the second boost DC-DC power chip U19 are electrically connected to pin 14 of the microcontroller U1. Resistor R55... One end of resistor 55 is electrically connected to the eighth pin of the second boost DC-DC power chip U19; one end of the seventeenth capacitor C17 is electrically connected to one end of the fifty-sixth resistor R56; the other end of the fifty-sixth resistor R56 is electrically connected to the fourth pin of the second boost DC-DC power chip U19; one end of the fifty-seventh resistor R57 and one end of the fifty-eighth resistor R58 are jointly electrically connected to the third pin of the second boost DC-DC power chip U19; the other end of the fifty-eighth resistor R58 and the sixth pin of the second boost DC-DC power chip U19 are jointly electrically connected to one end of the fifty-ninth resistor R59 and the fourth pin of the current sensing amplifier U20. The other end of the sixteenth capacitor C16, the other end of the fifty-fourth resistor R54, the other end of the fifty-fifth resistor R55, the other end of the seventeenth capacitor C17, the other end of the fifty-seventh resistor R57, and the fifth pin of the second boost DC-DC power chip U19 are all grounded. The other end of the fifty-ninth resistor R59 and the fifth pin of the current sensing amplifier U20 are electrically connected to the action response component. The second and first pins of the current sensing amplifier U20 are grounded. The third pin of the current sensing amplifier U20 is electrically connected to the third voltage VCC2 of the power module. The sixth pin of the current sensing amplifier U20 is electrically connected to the eighth pin of the microcontroller U1. When the microcontroller U1 determines that the parachute opening conditions are met based on the external environmental information collected by the sensor module, it controls the activation circuit to work, activating the action response component (such as the servo motor and / or gas generator) to execute the parachute opening operation.The second boost DC-DC power supply chip U19 in the activation circuit boosts the voltage to ensure sufficient voltage is provided to the action response component, guaranteeing its reliable operation. The current sensing amplifier U20 monitors the current and provides feedback on the activation status of the action response component. It should be noted that a signal control circuit can have multiple action response components, and multiple activation circuits can be configured for each of these components.

[0042] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered as equivalent substitutions and are included within the protection scope of the present invention.

Claims

1. A signal control circuit for use in a parachute opening controller, used to activate an action response component electrically connected to the parachute opening controller, the action response component including a servo motor and / or a gas generator, characterized in that, The signal control circuit includes a microcontroller, a power supply module, a sensing module, an activation module, and a heating module. The power supply module supplies power to the microcontroller, the sensing module, the activation module, and the heating module. The activation module is electrically connected to the action response component. The microcontroller collects external environmental information through the sensing module, and when the external environmental information meets the umbrella opening conditions, it controls the activation module to activate the action response component. The heating module includes a heating circuit and a graphene flexible electrothermal film. The heating circuit is electrically connected to the power supply module, and the graphene flexible electrothermal film is electrically connected to the heating circuit. When the external temperature is lower than the preset low temperature threshold of the heating module, the heating circuit responds and supplies power to the graphene flexible electrothermal film so that the graphene flexible electrothermal film is energized and heats up.

2. The signal control circuit for an umbrella opening controller according to claim 1, characterized in that, The power module includes a battery connector and a transformer circuit. The battery connector is used to electrically connect to the battery. The transformer circuit is electrically connected to the battery connector. The battery connector outputs a first voltage for the activation module to operate. The transformer circuit converts the first voltage and outputs a second voltage for the heating module to operate, a third voltage for the sensing module to operate, and a fourth voltage for the microcontroller to operate.

3. The signal control circuit applied to the umbrella opening controller according to claim 2, characterized in that, The transformer circuit includes a first step-down circuit for generating the second voltage, a second step-down circuit for generating the third voltage, and a third step-down circuit for generating the fourth voltage.

4. The signal control circuit applied to the umbrella opening controller according to claim 3, characterized in that, The power module also includes: a charging connector, a fast charging protocol circuit, and a charging protection circuit; The fast charging protocol circuit is electrically connected to the charging connector and is used to communicate and handshake with the host computer of the charger when the charging connector is connected to the charger, so that the charger provides a preset charging voltage to the charging connector. The charging protection circuit is electrically connected to the charging connector and the battery connector, and is used to form a charging circuit between the charging connector and the battery connector, and to stop charging when the battery electrically connected to the battery connector overheats or is charged to a preset limit.

5. The signal control circuit for an umbrella opening controller according to claim 4, characterized in that, The charging protection circuit includes: a battery management chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, a first light-emitting diode, a second light-emitting diode, a first diode, and a second inductor; The third resistor and the fourth resistor are electrically connected together to the battery management chip, and the third resistor is also electrically connected to the charging connector; The fourth resistor is also electrically connected to the positive terminal of the first LED and the positive terminal of the second LED. The negative terminal of the first LED is electrically connected to the fourteenth pin of the battery management chip, and the negative terminal of the second LED is electrically connected to the fifteenth pin of the battery management chip. One end of the fifth resistor, one end of the sixth resistor, and the battery connector are all electrically connected to the eleventh pin of the battery management chip. The sixth resistor and the third capacitor are also electrically connected to the tenth and thirteenth pins of the battery management chip. One end of the seventh resistor is electrically connected to the twelfth pin of the battery management chip; The cathode of the first diode and one end of the second inductor are electrically connected to the second and third pins of the battery management chip. The second inductor is also connected to the eighth pin of the battery management chip and one end of the eighth resistor. The eighth resistor is also electrically connected to the ninth pin of the battery management chip and the battery connector.

6. The signal control circuit for an umbrella opening controller according to claim 5, characterized in that, The signal control circuit also includes a power-on unit; The power-on unit includes a button connector and a power-on circuit. The button connector is used to electrically connect to the power-on button, and the power-on circuit is electrically connected to the button connector, the microcontroller, and the transformer circuit. When the power button, which is electrically connected to the button connector, is pressed, the power-on circuit responds and wakes up the microcontroller, starting the transformer circuit to output the second voltage, the third voltage, and the fourth voltage.

7. The signal control circuit for an umbrella opening controller according to claim 6, characterized in that, The power-on circuit includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fourth capacitor, a second diode, a third diode, a fourth diode, a fifth diode, and a first P-channel enhancement-mode MOSFET. One end of the ninth resistor, one end of the tenth resistor, one end of the fourth capacitor, and the gate of the first P-channel enhancement-mode field-effect transistor are electrically connected to the button connector, and the other end of the tenth resistor and the drain of the first P-channel enhancement-mode field-effect transistor are electrically connected to the battery connector. The source of the first P-channel enhancement-mode MOSFET is electrically connected to one end of the eleventh resistor, and the other end of the eleventh resistor, the cathode of the second diode, one end of the twelfth resistor, and the anode of the third diode are all electrically connected to the microcontroller. One end of the thirteenth resistor and the positive terminal of the fourth diode are electrically connected to the microcontroller; one end of the fourteenth resistor and one end of the fifteenth resistor are electrically connected to the fifth diode; and the other end of the fifteenth resistor is electrically connected to the charging connector. The cathodes of the third diode, the fourth diode, and the fifth diode, along with one end of the sixteenth resistor, are electrically connected to the step-down DC-DC power supply chip.

8. The signal control circuit applied to the umbrella opening controller according to claim 7, characterized in that, The signal control circuit also includes a power indicator circuit, which is electrically connected to the microcontroller, the charging connector, and the battery connector. When the charging connector has a charging voltage, the power indicator circuit indicates the battery power connected to the battery connector; or, when the power button is pressed, the microcontroller drives the power indicator circuit to indicate the battery power connected to the battery connector.

9. The signal control circuit for an umbrella opening controller according to claim 8, characterized in that, The power indicator circuit includes: a voltage reference chip, a sixth diode, a seventh diode, an eighth diode, a third light-emitting diode, a fourth light-emitting diode, a fifth light-emitting diode, and a sixth light-emitting diode; When the battery charge connected to the battery connector is less than 1 / 4, the third LED is lit, and the fourth, fifth, and sixth LEDs are off; when the battery charge connected to the battery connector is greater than 1 / 4 and less than 1 / 2, the third and fourth LEDs are lit, and the fifth and sixth LEDs are off; when the battery charge connected to the battery connector is greater than 1 / 2 and less than 3 / 4, the third, fourth, and fifth LEDs are lit, and the sixth LED is off; when the battery charge connected to the battery connector is greater than 3 / 4, all three LEDs are lit.

10. The signal control circuit applied to an umbrella opening controller according to claim 3, characterized in that, The heating circuit includes: a comparator, a 31st resistor, a 32nd resistor, a 33rd resistor, a 34th resistor, a 35th resistor, a 36th resistor, a 37th resistor, a 38th resistor, a third P-channel enhancement-mode field-effect transistor, and a second N-channel enhancement-mode field-effect transistor. The source of the third P-channel enhancement-mode field-effect transistor is electrically connected to the graphene flexible electrothermal film. The drain of the third P-channel enhancement-mode field-effect transistor, one end of the thirty-first resistor, the other end of the first inductor, the other end of the first resistor, and the other end of the second capacitor are all electrically connected together. The other end of the thirty-first resistor and the gate of the third P-channel enhancement-mode field-effect transistor are all electrically connected to the drain of the second N-channel enhancement-mode field-effect transistor. One end of the thirty-second resistor and one end of the thirty-third resistor are all electrically connected to the gate of the second N-channel enhancement-mode field-effect transistor. The other end of the thirty-second resistor and the source of the second N-channel enhancement-mode field-effect transistor are all grounded. The other end of the thirty-third resistor and one end of the thirty-fourth resistor are connected to the fourth pin of the comparator, and the other end of the thirty-fourth resistor and the fifth pin of the comparator are electrically connected to the second pin of the second linear regulator; the second pin of the comparator is grounded. One end of the thirty-fifth resistor and one end of the thirty-sixth resistor are electrically connected to the first pin of the comparator, the other end of the thirty-fifth resistor is electrically connected to the second pin of the second linear regulator, and the other end of the thirty-sixth resistor is grounded. One end of the thirty-seventh resistor and one end of the thirty-eighth resistor are electrically connected to the third pin of the comparator, the other end of the thirty-seventh resistor is electrically connected to the second pin of the second linear regulator, and the other end of the thirty-eighth resistor is grounded; The thirty-sixth resistor is a thermistor, the thirty-fifth resistor has the same resistance value as the thirty-seventh resistor, and the thirty-eighth resistor has the same resistance value as the thirty-sixth resistor at the low temperature threshold.

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