Heating sheet short circuit protection circuit and electronic equipment

Abstract

The utility model relates to the technical field of electronic control, in particular to a heating sheet short-circuit protection circuit and electronic equipment. The heating sheet short-circuit protection circuit comprises a short-circuit detection unit, a power supply control unit and a heating sheet module composed of more than one heating sheet, the first end of the power supply control unit is connected with the power supply battery, the second end of the power supply control unit is connected with the first end of the heating piece module, the second end of the heating piece module is connected with the first end of the short circuit detection unit, and the second end of the short circuit detection unit is connected with the third end of the power supply control unit. The short circuit detection unit collects the working voltage of the heating sheet module and transmits the working voltage to the power supply control unit; when the power supply control unit judges that the amplitude of the working voltage exceeds a preset voltage amplitude range, the power supply control unit disconnects a power supply loop of the power supply battery as the heating sheet module. By performing short-circuit detection on the heating sheet module, a short-circuit condition which is not detected when a plurality of heating sheets are connected in series to work is avoided, and the safety performance of equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic control technical field especially relates to a heating piece short circuit protection circuit and electronic equipment. BACKGROUND

[0002] In modern life, personal care massage instruments have become an indispensable part of many families, they not only can provide comfortable massage experience, but also can further enhance the relaxation effect through hot compress function. In the heating circuit part of the existing product, multiple heating pieces generally only equipped with one negative temperature coefficient (NTC) resistance for temperature monitoring. If the heating piece detected by the NTC resistance occurs short circuit, the heating piece does not work, the temperature does not rise, the resistance value of the NTC resistance does not change, but the whole voltage will be loaded to other heating pieces, which will cause other heating pieces to rapidly heat up in a short period of time, but the NTC resistance cannot detect the heating of other heating pieces, eventually leading to abnormal heating of the heating piece, which exists the risk of scalding the user's skin and causing fire.

[0003] The above content is only used to assist in understanding the technical scheme of the utility model, and does not represent that the above content is prior art. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a heating piece short circuit protection circuit and electronic equipment, which aims to solve the technical problem that the short circuit condition of the heating piece in the prior art will cause abnormal heating phenomenon.

[0005] To achieve the above purpose, the utility model technical scheme provides a heating piece short circuit protection circuit, which comprises a short circuit detection unit, a power supply control unit and a heating piece module composed of more than one heating piece.

[0006] The first end of the power supply control unit is connected with a power supply battery, the second end of the power supply control unit is connected with the first end of the heating piece module, the second end of the heating piece module is connected with the first end of the short circuit detection unit, and the second end of the short circuit detection unit is connected with the third end of the power supply control unit.

[0007] The short circuit detection unit is used for collecting the working voltage of the heating piece module and transmitting the working voltage to the power supply control unit.

[0008] The power supply control unit is used for judging whether the amplitude of the working voltage is within a preset voltage amplitude range, and disconnecting the power supply circuit of the heating piece module when the amplitude of the working voltage exceeds the preset voltage amplitude range.

[0009] In an embodiment, the heating pieces in the heating piece module are connected in series one by one, and the short circuit detection unit comprises a first resistor, a second resistor, a first diode, a second diode and a first capacitor;

[0010] The first end of the first resistor is arranged between two heating pieces in series, the second end of the first resistor is connected to the first end of the second resistor, the anode of the first diode and the cathode of the second diode, the cathode of the first diode is connected to a direct current power supply, the anode of the second diode is grounded, the second end of the second resistor is connected to the third end of the power supply control unit and the first end of the first capacitor, and the second end of the first capacitor is grounded.

[0011] In an embodiment, the heating piece short circuit protection circuit further comprises a temperature detection unit;

[0012] The first end of the temperature detection unit is connected to the heating piece module, and the second end of the temperature detection unit is connected to the fourth end of the power supply control unit.

[0013] The temperature detection unit is configured to collect a temperature sampling signal of the heating piece module and transmit the temperature sampling signal to the power supply control unit.

[0014] The power supply control unit is further configured to determine whether the amplitude of the temperature sampling signal is within a preset temperature range, and to disconnect the power supply circuit of the heating piece module when the amplitude of the temperature sampling signal exceeds the preset temperature range.

[0015] In an embodiment, the temperature detection unit comprises a third resistor and a fourth resistor.

[0016] The fourth resistor is arranged in contact with any heating piece in the heating piece module, the first end of the third resistor is connected to a direct current power supply, the second end of the third resistor is connected to the first end of the fourth resistor and the fourth end of the power supply control unit, and the second end of the fourth resistor is grounded.

[0017] In an embodiment, the heating piece short circuit protection circuit further comprises a display unit.

[0018] The display unit is connected to the fifth end of the power supply control unit.

[0019] The power supply control unit is further configured to transmit the temperature sampling signal to the display unit and drive the display unit to display real-time temperature data of the heating piece.

[0020] In an embodiment, the power supply control unit is further configured to generate an abnormality signal when the amplitude of the working voltage exceeds the preset voltage amplitude range, transmit the abnormality signal to the display unit, and drive the display unit to perform abnormality prompting.

[0021] In an embodiment, the heating sheet short circuit protection circuit further comprises a switch control unit.

[0022] The switch control unit is connected to the fifth end of the power supply control unit.

[0023] The switch control unit is configured to generate a heating driving signal when the switch is closed.

[0024] The power supply control unit is further configured to turn on the power supply battery to supply power to the power supply loop of the heating sheet module when the amplitude of the working voltage is within the preset voltage amplitude range and the heating driving signal is received.

[0025] In an embodiment, the power supply control unit comprises a boost module and a microcontroller.

[0026] The first end of the boost module is connected to the power supply battery, the second end of the boost module is connected to the first end of the heating sheet module, the third end of the boost module is connected to the first end of the microcontroller, and the second end of the microcontroller is connected to the second end of the short circuit detection unit.

[0027] The boost module is configured to boost the power supply voltage of the power supply battery and transmit the boosted power supply voltage to the heating sheet module.

[0028] The short circuit detection unit is further configured to transmit the working voltage to the microcontroller.

[0029] The microcontroller is configured to determine whether the amplitude of the working voltage is within the preset voltage amplitude range, and stop the boost module from transmitting the power supply voltage to the heating sheet module when the amplitude of the working voltage exceeds the preset voltage amplitude range.

[0030] In an embodiment, the boost module comprises a boost chip, a first inductor, a fifth resistor, and a sixth resistor.

[0031] The first end of the boost chip is connected to the power supply battery and the first end of the first inductor, the second end of the boost chip is connected to the second end of the first inductor, the third end of the boost chip is connected to the first end of the heating sheet module, the fourth end of the boost chip is connected to the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor is connected to the first end of the microcontroller, and the second end of the sixth resistor is grounded.

[0032] In addition, in order to achieve the above object, the utility model also provides an electronic equipment, the electronic equipment includes the heating sheet short circuit protection circuit as described above.

[0033] The utility model discloses technical scheme through proposing a kind of heating sheet short circuit protection circuit and electronic equipment.The heating sheet short circuit protection circuit includes: short circuit detection unit, power supply control unit and the heating sheet module consisting of more than one heating sheet;The first end of the power supply control unit is connected with power supply battery, the second end of the power supply control unit is connected with the first end of the heating sheet module, the second end of the heating sheet module is connected with the first end of the short circuit detection unit, the second end of the short circuit detection unit is connected with the third end of the power supply control unit;The short circuit detection unit is used to collect the working voltage of heating sheet module, and the working voltage is transmitted to the power supply control unit;The power supply control unit is used to judge whether the amplitude of the working voltage is within preset voltage amplitude range, when the amplitude of the working voltage exceeds the preset voltage amplitude range, disconnects the power supply battery and supplies the power supply circuit of heating sheet module.Through collecting working voltage, short circuit detection is carried out to heating sheet module, avoid the short circuit condition that multiple heating sheets are not detected when working in series to cause abnormal heating phenomenon, improve equipment safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in embodiment or prior art description, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, other drawings can also be obtained according to the structure shown in these drawings.

[0035] Figure 1 It is the structural schematic diagram of the first embodiment of the utility model heating sheet short circuit protection circuit;

[0036] Figure 2 It is the circuit connection diagram of the first short circuit detection in the second embodiment of the utility model heating sheet short circuit protection circuit;

[0037] Figure 3 It is the circuit connection diagram of the second short circuit detection in the second embodiment of the utility model heating sheet short circuit protection circuit;

[0038] Figure 4 It is the structural schematic diagram of the third embodiment of the utility model heating sheet short circuit protection circuit;

[0039] Figure 5 It is the circuit connection diagram of temperature detection unit in the third embodiment of the utility model heating sheet short circuit protection circuit;

[0040] Figure 6 The circuit connection diagram of the power supply control unit in the third embodiment of the heating sheet short circuit protection circuit.

[0041] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0042] The reference signs are explained as follows: 10, short circuit detection unit; 20, power supply control unit; 30, heating sheet module; 40, temperature detection unit; 50, display unit; 60, switch control unit; 201, voltage boosting module; 202, microcontroller; BAT, power supply battery; VDD, power supply voltage; VC, direct current power supply; R1-R6, first to sixth resistors; RS, protection resistor; A1-A4, first to fourth heating sheets; C1, first capacitor; D1, first diode; D2, second diode; L1, first inductor; U1, voltage boosting chip. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein merely exemplify the present application and are not intended to limit the present application.

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0045] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0046] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0047] Reference Figure 1 , Figure 1The utility model discloses a structure diagram of first embodiment of heating sheet short circuit protection circuit.

[0048] In the embodiment, the heating sheet short circuit protection circuit comprises a short circuit detection unit 10, a power supply control unit 20 and a heating sheet module 30 comprising more than one heating sheet. The first end of the power supply control unit 20 is connected to a power supply battery BAT, the second end of the power supply control unit 20 is connected to the first end of the heating sheet module 30, the second end of the heating sheet module 30 is connected to the first end of the short circuit detection unit 10, and the second end of the short circuit detection unit 10 is connected to the third end of the power supply control unit 20.

[0049] It should be noted that the short circuit detection unit 10 can be used to collect the working voltage of the heating sheet module 30 and transmit the working voltage to the power supply control unit 20. The power supply control unit 20 can be used to determine whether the amplitude of the working voltage is within a preset voltage amplitude range. When the amplitude of the working voltage exceeds the preset voltage amplitude range, the power supply circuit of the heating sheet module 30 is disconnected.

[0050] It should be understood that the heating sheets in the heating sheet module 30 are connected in series, and the specifications of the heating sheets are basically consistent. The working voltage of the heating sheet module 30 during operation can be sampled by transmitting the working voltage to the short circuit detection unit 10 in the heating sheet series circuit. When any heating sheet is short-circuited, the amplitude of the working voltage will also change, so the short-circuit condition of the heating sheet can be detected by sampling the amplitude of the working voltage. The power supply control unit 20 can be a functional device with signal transmission and processing capabilities, such as a single-chip microcomputer or a microcontroller (MCU) and its peripheral circuit. It can process the acquired electrical signals by pre-storing programmable software and control the output pins to generate corresponding output electrical signals according to the processing results. At the same time, the power supply control unit 20 can also determine whether to turn on or off the power signal input by the power supply battery and transmitted to the heating sheet module according to the amplitude of the working voltage.

[0051] The preset voltage amplitude range can be a voltage value range of the heating sheet module when each heating sheet in the power supply control unit 20 is normal, and the preset voltage amplitude range can also be a specific voltage value. However, the electronic device is inevitably disturbed in operation, and the signal fluctuates in an acceptable range, so that the working voltage of the heating sheet module in normal operation can be set in a certain range. When the amplitude of the current working voltage of the heating sheet collected by the short-circuit detection unit 10 exceeds the preset voltage amplitude range, it can be judged that the heating sheet in the heating sheet module 30 has a short-circuit condition, the power supply circuit of the heating sheet module 30 is disconnected, the heating sheet is powered off to stop heating, and the risk of scalding the user is prevented.

[0052] The heating sheet short-circuit protection circuit includes a short-circuit detection unit, a power supply control unit, and a heating sheet module composed of more than one heating sheet. The first end of the power supply control unit is connected with a power supply battery, the second end of the power supply control unit is connected with the first end of the heating sheet module, the second end of the heating sheet module is connected with the first end of the short-circuit detection unit, and the second end of the short-circuit detection unit is connected with the third end of the power supply control unit. The short-circuit detection unit is used for collecting the working voltage of the heating sheet module and transmitting the working voltage to the power supply control unit. The power supply control unit is used for judging whether the amplitude of the working voltage is within a preset voltage amplitude range, and disconnecting the power supply circuit of the heating sheet module when the amplitude of the working voltage exceeds the preset voltage amplitude range. The working voltage is collected to detect the short circuit of the heating sheet module, so that the abnormal heating phenomenon caused by the undetected short circuit of the multiple heating sheets in series is avoided, and the safety performance of the equipment is improved.

[0053] Referring to Figure 2 , Figure 2 The first short-circuit detection circuit connection diagram of the second embodiment of the heating sheet short-circuit protection circuit is provided based on the first embodiment of the heating sheet short-circuit protection circuit.

[0054] The heating pieces (A1-A4) in the heating piece module 30 are connected in series one by one, and the short circuit detection unit 10 comprises a first resistor R1, a second resistor R2, a first diode D1, a second diode D2 and a first capacitor C1. The first end of the first resistor R1 is arranged between two heating pieces in series, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the anode of the first diode D1 and the cathode of the second diode D2 at the same time, the cathode of the first diode D1 is connected to a direct current power supply VC, the anode of the second diode D2 is grounded, the second end of the second resistor R2 is connected to the third end of the power supply control unit 20 and the first end of the first capacitor C1 at the same time, and the second end of the first capacitor C1 is grounded.

[0055] It should be understood that the direct current power supply VC can be a 3.3V direct current power supply, which can be provided by a direct current power supply outside the heating piece short circuit protection circuit, or can be obtained after voltage regulation and rectification of the above-mentioned power supply battery, which is not limited here. By using two diodes, the working voltage is clamped to 0-3.3V, preventing damage to the detection pin due to excessive working voltage.

[0056] The present embodiment takes four heating pieces (referring to the first to fourth heating pieces A1-A4) as an example, which can also be two, three or other number of heating pieces. The specification parameters of the four heating pieces are basically the same, the current flowing through the heating pieces in series is the same, and the heating conditions are consistent, so only one NTC resistor can be set for temperature detection to save cost.

[0057] Referring to Figure 2 , the first resistor R1 in the short circuit detection unit 10 is connected between A2 and A3. When none of the four heating pieces has a short circuit condition, the working voltage VT collected by the short circuit detection unit 10 is VT=0.5*VDD. Wherein, VT is the working voltage of the heating piece module, and VDD is the power supply voltage of the heating piece module. When A1 or A2 has a short circuit, VT=(2 / 3)*VDD at this time; when A3 or A4 has a short circuit, VT=(1 / 3)*VDD at this time; therefore, the power supply control unit can detect the abnormality of the heating piece module according to the amplitude of the working voltage, and control the heating piece module to be powered off when there is a heating piece short circuit.

[0058] Further, referring to Figure 3 , Figure 3The first resistor R1 in the short circuit detection unit 10 can also be connected between A1 and A2, between A3 and A4 and between A1 and the power supply signal, and the specific numerical value of the preset voltage amplitude range can be realized, and the implementation manner is similar to the above two schemes, and thus will not be repeated here.

[0059] It should be noted that the first resistor R1 in the short circuit detection unit 10 can also be connected between A1 and A2, between A3 and A4 and between A1 and the power supply signal, and the specific numerical value of the preset voltage amplitude range can be realized, and the implementation manner is similar to the above two schemes, and thus will not be repeated here.

[0060] Referring to Figure 4 , Figure 4 The third embodiment of the heating sheet short circuit protection circuit of the utility model is a structure schematic view. The third embodiment of the heating sheet short circuit protection circuit of the utility model is based on the above-mentioned embodiment of the heating sheet short circuit protection circuit.

[0061] The heating sheet short circuit protection circuit further comprises a temperature detection unit 40. The first end of the temperature detection unit 40 is connected with the heating sheet module 30, and the second end of the temperature detection unit 40 is connected with the fourth end of the power supply control unit 20.

[0062] It should be noted that the temperature detection unit 40 can be used to collect the temperature of the heating sheet module 30 to generate a temperature sampling signal and transmit the temperature sampling signal to the power supply control unit 20; the power supply control unit 20 can also be used to judge whether the amplitude of the temperature sampling signal is within a preset temperature range, and when the amplitude of the temperature sampling signal exceeds the preset temperature range, the power supply circuit for the heating sheet module 30 is disconnected.

[0063] It should be understood that the temperature detection unit 40 can generate a corresponding temperature sampling signal in response to the temperature of the heating sheet module, and the specific temperature value of the heating sheet module can be obtained through the amplitude of the temperature sampling signal. The preset temperature range can be a target temperature range for judging the heating end of the heating sheet module, which is pre-stored in the power supply control unit 20. When the heating sheet module is heated to the target temperature, the power supply control unit 20 controls the heating sheet module to stop heating. At the same time, the target temperature can be specifically set according to the use demand of the user, and is not limited to a specific numerical value.

[0064] Referring to Figure 5 , Figure 5 It is the circuit connection drawing of the temperature detection unit in the third embodiment of the heating sheet short circuit protection circuit. The temperature detection unit 40 comprises: a third resistor R3 and a fourth resistor R4; the fourth resistor R4 is arranged in close contact with any heating sheet in the heating sheet module 30, the first end of the third resistor R3 is connected to a direct current power supply VC, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4 and the fourth end of the power supply control unit 20 at the same time, and the second end of the fourth resistor R4 is grounded.

[0065] The fourth resistor R4 is an NTC resistor, and the resistance decreases with the increase of temperature. Through the voltage division ratio, the temperature sampling signal after voltage division is given to the power supply control unit 20 for detection, and then the current temperature is judged.

[0066] Further, the heating sheet short circuit protection circuit further comprises: a display unit 50; the display unit 50 is connected to the fifth end of the power supply control unit 20; the power supply control unit 20 is also used for transmitting the temperature sampling signal to the display unit 50, and driving the display unit 50 to display the real-time temperature data of the heating sheet.

[0067] It should be noted that the display unit 50 can be a display screen or a light-emitting diode array lamp. The real-time temperature data of the heating sheet module 30 can be displayed according to the temperature sampling signal. The power supply control unit 20 can also be used to generate an abnormal signal when the amplitude of the working voltage exceeds the preset voltage amplitude range, transmit the abnormal signal to the display unit 50, and drive the display unit 50 to perform abnormal prompt. The abnormal prompt can be a light-on prompt, or the display unit 50 can display the word "heating sheet abnormal" to remind the user.

[0068] Further, the heating sheet short circuit protection circuit further comprises: a switch control unit 60; the switch control unit 60 is connected to the fifth end of the power supply control unit 20.

[0069] It should be noted that the switch control unit 60 can be used to generate a heating driving signal when the switch is closed; the power supply control unit 20 can also be used to turn on the power supply circuit of the heating sheet module 30 when the amplitude of the working voltage is within the preset temperature range and the heating driving signal is received.

[0070] It should be understood that when the user uses the electronic device containing the heating sheet, the user can choose whether to heat by pressing the switch or the button, under the condition that the hardware is normally running, the user closes the switch to the heating position or long-presses the button, the power supply control unit turns on the power supply circuit of the heating sheet module, starts the heating function, and simultaneously monitors the working voltage of the heating sheet module in real time, and when the amplitude of the working voltage exceeds the preset voltage amplitude range, the power supply circuit of the heating sheet module is automatically disconnected.

[0071] With reference to Figure 6 , Figure 6 It is the circuit connection diagram of the power supply control unit in the third embodiment of the heating sheet short-circuit protection circuit.

[0072] The power supply control unit 20 comprises a boost module 201 and a microcontroller 202; the first end of the boost module 201 is connected with the power supply battery, the second end of the boost module 201 is connected with the first end of the heating sheet module 30, the third end of the boost module 201 is connected with the first end of the microcontroller 202, and the second end of the microcontroller 202 is connected with the second end of the short-circuit detection unit 10.

[0073] It should be noted that the voltage of the power supply battery in the electronic device is generally low, and multiple heating sheets need to be driven for heating after being boosted. The boost module 201 can be used for boosting the power supply voltage of the power supply battery BAT, and transmitting the boosted power supply voltage to the heating sheet module 30; the short-circuit detection unit 10 can also be used for transmitting the working voltage to the microcontroller 202; the microcontroller 202 can be used for judging whether the amplitude of the working voltage is within the preset voltage amplitude range, and when the amplitude of the working voltage exceeds the preset voltage amplitude range, the boost module 201 stops transmitting the power supply voltage to the heating sheet module 30.

[0074] The voltage boosting module 201 comprises a voltage boosting chip U1, a first inductor L1, a fifth resistor R5 and a sixth resistor R6; a first end of the voltage boosting chip U1 is connected with the power supply battery BAT and a first end of the first inductor L1, a second end of the voltage boosting chip U1 is connected with a second end of the first inductor L1, a third end of the voltage boosting chip U1 is connected with a first end of the heating sheet module 30, a fourth end of the voltage boosting chip U1 is connected with a first end of the fifth resistor R5 and a first end of the sixth resistor R6, a second end of the fifth resistor R5 is connected with a first end of the microcontroller 202, and a second end of the sixth resistor R6 is grounded.

[0075] In the embodiment, the heating sheet short-circuit protection circuit further comprises a temperature detection unit configured to collect a temperature of the heating sheet module to generate a temperature sampling signal and transmit the temperature sampling signal to the power supply control unit, and a user can customize a heating effect.

[0076] Further, the utility model discloses an electronic equipment. The electronic equipment comprises the heating sheet short-circuit protection circuit as described above.

[0077] It is to be noted that the control logic of the electronic equipment in the embodiment is as follows: after starting up by long pressing a key, the microcontroller controls the voltage boosting module to start voltage boosting work, and the heating sheet module is powered to start heating. The short-circuit detection unit starts to detect the working voltage of the heating sheet module to determine whether a short-circuit state exists. If a short circuit exists, the heating function is turned off. If the heating sheet module does not have a short circuit, the heating continues until the heating reaches a preset temperature range, and then the heating is turned off, otherwise the heating continues until the temperature reaches a preset value.

[0078] Since the electronic equipment adopts all the technical solutions of the above-mentioned embodiments, it has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0079] The above merely describes preferred embodiments of the present application, and is not intended to limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the present application, as described in the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A heating blade short circuit protection circuit, characterized by, The heating sheet short circuit protection circuit comprises a short circuit detection unit, a power supply control unit and a heating sheet module comprising more than one heating sheet; a first end of the power supply control unit is connected with a power supply battery, a second end of the power supply control unit is connected with a first end of the heating sheet module, a second end of the heating sheet module is connected with a first end of the short circuit detection unit, a second end of the short circuit detection unit is connected with a third end of the power supply control unit; the short circuit detection unit is configured to collect a working voltage of the heating sheet module and transmit the working voltage to the power supply control unit; the power supply control unit is configured to determine whether an amplitude of the working voltage is within a preset voltage amplitude range, and disconnect the power supply battery from the power supply circuit of the heating sheet module when the amplitude of the working voltage exceeds the preset voltage amplitude range.

2. The heating blade short circuit protection circuit according to claim 1, wherein the heating sheets in the heating sheet module are connected in series, and the short circuit detection unit comprises a first resistor, a second resistor, a first diode, a second diode and a first capacitor; a first end of the first resistor is arranged between two heating sheets connected in series, a second end of the first resistor is connected with a first end of the second resistor, an anode of the first diode and a cathode of the second diode, a cathode of the first diode is connected to a direct current power supply, an anode of the second diode is grounded, a second end of the second resistor is connected with a third end of the power supply control unit and a first end of the first capacitor, and a second end of the first capacitor is grounded.

3. The heating blade short circuit protection circuit according to claim 1, wherein The heating sheet short circuit protection circuit further comprises a temperature detection unit; a first end of the temperature detection unit is connected with the heating sheet module, and a second end of the temperature detection unit is connected with a fourth end of the power supply control unit; the temperature detection unit is configured to collect a temperature of the heating sheet module to generate a temperature sampling signal and transmit the temperature sampling signal to the power supply control unit; the power supply control unit is further configured to determine whether an amplitude of the temperature sampling signal is within a preset temperature range, and disconnect the power supply battery from the power supply circuit of the heating sheet module when the amplitude of the temperature sampling signal exceeds the preset temperature range.

4. The heating blade short circuit protection circuit according to claim 3, wherein the temperature detection unit comprises a third resistor and a fourth resistor; the fourth resistor is arranged in contact with any heating sheet in the heating sheet module, a first end of the third resistor is connected to a direct current power supply, a second end of the third resistor is connected with a first end of the fourth resistor and a fourth end of the power supply control unit, and a second end of the fourth resistor is grounded.

5. The heating blade short circuit protection circuit according to claim 4, wherein The heating sheet short circuit protection circuit further comprises a display unit; the display unit is connected with a fifth end of the power supply control unit; the power supply control unit is further configured to transmit the temperature sampling signal to the display unit to drive the display unit to display real-time temperature data of the heating sheet.

6. The heating blade short circuit protection circuit according to claim 5, wherein the power supply control unit is further configured to generate an abnormal signal when the amplitude of the working voltage exceeds the preset voltage amplitude range, transmit the abnormal signal to the display unit, and drive the display unit to perform abnormal prompt.

7. The heating blade short circuit protection circuit according to claim 1, wherein the heating sheet short circuit protection circuit further comprises a switch control unit; The fifth end of the switch control unit is connected with the power supply control unit; The switch control unit is configured to generate a heating driving signal when the switch is closed. The power supply control unit is further configured to turn on the power supply battery to supply power to the power supply loop of the heating sheet module when the amplitude of the working voltage is within a preset voltage amplitude range and the heating driving signal is received.

8. The heating blade short circuit protection circuit according to claim 1, wherein The power supply control unit comprises a boost module and a microcontroller. The first end of the boost module is connected with the power supply battery, the second end of the boost module is connected with the first end of the heating sheet module, the third end of the boost module is connected with the first end of the microcontroller, and the second end of the microcontroller is connected with the second end of the short circuit detection unit. The boost module is configured to boost the power supply voltage of the power supply battery and transmit the boosted power supply voltage to the heating sheet module. The short circuit detection unit is further configured to transmit the working voltage to the microcontroller. The microcontroller is configured to determine whether the amplitude of the working voltage is within a preset voltage amplitude range, and stop the boost module from transmitting the power supply voltage to the heating sheet module when the amplitude of the working voltage exceeds the preset voltage amplitude range.

9. The heating blade short circuit protection circuit according to claim 8, wherein The boost module comprises a boost chip, a first inductor, a fifth resistor, and a sixth resistor. The first end of the boost chip is connected with the power supply battery and the first end of the first inductor, the second end of the boost chip is connected with the second end of the first inductor, the third end of the boost chip is connected with the first end of the heating sheet module, the fourth end of the boost chip is connected with the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor is connected with the first end of the microcontroller, and the second end of the sixth resistor is grounded.

10. An electronic device, comprising: The electronic device comprises the heating sheet short circuit protection circuit according to any one of claims 1-9.

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