Explosion-proof circuit and hand-held electric tool for coal mines

Abstract

The present disclosure proposes an explosion-proof circuit and a handheld electric tool for coal mines, wherein the explosion-proof circuit includes: a power module, a drive module, a current acquisition module and a control module; wherein the first power supply end of the power module is connected to the power supply end of the motor, the drive end of the drive module is arranged between the power module and the motor, and the drive module is used to drive the motor; the input end of the current acquisition module is connected to the drive end of the drive module, and the current acquisition module is used to collect the current of the motor; the control module is used to turn off the motor and restart the motor after a preset time when the current value of the motor is greater than a first preset current value, and to turn off the motor when the number of restarts of the motor is greater than a preset number. In the explosion-proof circuit and handheld electric tool for coal mines disclosed in the present disclosure, the current protection of the motor is realized, and the explosion-proof performance of the motor is improved, so that when the explosion-proof circuit is applied to the electric tool, it can meet the safety production needs of industries such as coal mines.

Description

Technical Field

[0001] The present disclosure relates to the technical field of explosion-proof circuits, and in particular to an explosion-proof circuit and a handheld electric tool for coal mines. Background Art

[0002] Power tools are equipment that convert electrical energy into mechanical energy and use mechanical energy to perform various processing operations such as drilling, cutting, and grinding. For industries such as coal mining, the explosion-proof performance of power tools is one of the most important indicators, which is directly related to the safety of production and processing. Therefore, it is necessary to improve the explosion-proof performance of power tools to meet the safe production needs of industries such as coal mining. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an object of the present disclosure is to provide an explosion-proof circuit and a handheld electric tool for coal mines.

[0005] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides an explosion-proof circuit for coal mines, comprising: a power supply module, a drive module, a current acquisition module and a control module; wherein, the first power supply end of the power supply module is connected to the power supply end of the motor, the drive end of the drive module is arranged between the power supply module and the motor, and the drive module is used to drive the motor; the input end of the current acquisition module is connected to the drive end of the drive module, and the current acquisition module is used to collect the current of the motor; the first input end of the control module is connected to the output end of the current acquisition module, the output end of the control module is connected to the input end of the drive module, and the control module is used to turn off the motor when the current value of the motor is greater than a first preset current value and restart the motor after a preset time, and turn off the motor when the number of restarts of the motor is greater than a preset number.

[0006] Optionally, the power module includes: a power bus, which is used to output a bus voltage, the power bus is connected to the power end of the motor, and the driving end of the drive module is arranged between the power bus and the motor; a first conversion unit, which includes: a boost chip, a first capacitor, a second capacitor, a first diode, a third capacitor, a first resistor, a thirty-ninth resistor, an inductor, a second diode, a second resistor, a third resistor, a fourth capacitor and a fifth capacitor, the first end of the first capacitor is connected to the power bus, the second end of the first capacitor is grounded, the first end of the second capacitor is connected to the first end of the first capacitor, and the The second end is connected to the second end of the first capacitor, the anode of the first diode is connected to the first end of the second capacitor, the cathode of the first diode is connected to the input end of the boost chip, the first end of the third capacitor is connected to the cathode of the first diode, the second end of the third capacitor is connected to the second end of the second capacitor, the first end of the first resistor is grounded, the second end of the first resistor is connected to the enable end of the boost chip, the first end of the thirty-ninth resistor is connected to the second end of the first resistor, and the second end of the thirty-ninth resistor is used to pass the enable signal, so the first end of the inductor is connected to the input end of the boost chip, and the second end of the inductor is connected to the input end of the boost chip. and an output end of the boost chip, an anode of the second diode is connected to the output end of the boost chip, a first end of the fourth capacitor is grounded, a second end of the fourth capacitor is connected to a cathode of the second diode, a first end of the fifth capacitor is connected to a first end of the fourth capacitor, a second end of the fifth capacitor is connected to a second end of the fourth capacitor, a first end of the second resistor is connected to a feedback end of the boost chip, a second end of the second resistor is connected to the cathode of the second diode, a first end of the third resistor is grounded, and a second end of the third resistor is connected to a first end of the second resistor; a second conversion unit, the second conversion unit includes: a first A step-down chip, a sixth capacitor, a seventh capacitor and an eighth capacitor, wherein a first end of the sixth capacitor is connected to a first end of the third capacitor, a second end of the sixth capacitor is grounded, an input end of the first step-down chip is connected to a first end of the sixth capacitor, a first ground end of the first step-down chip is connected to a second end of the sixth capacitor, a first end of the seventh capacitor is connected to an output end of the first step-down chip, a second end of the seventh capacitor is connected to a second ground end of the first step-down chip, a first end of the eighth capacitor is connected to a first end of the seventh capacitor, a second end of the eighth capacitor is connected to a second end of the seventh capacitor, and a second end of the eighth capacitor is grounded;A third conversion unit, the third conversion unit includes: a second buck chip, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor and a fourteenth capacitor, the first end of the ninth capacitor is connected to the first end of the eighth capacitor, the second end of the ninth capacitor is connected to the second end of the eighth capacitor, the first end of the tenth capacitor is connected to the first end of the ninth capacitor, the second end of the tenth capacitor is connected to the second end of the ninth capacitor, the input end and the flash memory end of the second buck chip are respectively connected to the first end of the tenth capacitor, the ground end of the second buck chip is connected to the second end of the tenth capacitor, the first end of the eleventh capacitor is connected to the output end of the second buck chip, the second end of the eleventh capacitor is connected to the ground end of the second buck chip, the first end of the twelfth capacitor is connected to the ground end of the eleventh capacitor The first end of the twelfth capacitor is connected to the second end of the eleventh capacitor, the first end of the thirteenth capacitor is connected to the first end of the twelfth capacitor, the second end of the thirteenth capacitor is connected to the second end of the twelfth capacitor, the first end of the fourteenth capacitor is connected to the first end of the thirteenth capacitor, and the second end of the fourteenth capacitor is connected to the second end of the thirteenth capacitor; wherein the power bus is used to output a first voltage, the second end of the fifth capacitor is used to output a second voltage, the power end of the driving module is connected to the second end of the fifth capacitor, the first end of the eighth capacitor is used to output a third voltage, the power end of the current acquisition module is connected to the first end of the eighth capacitor, the first end of the eleventh capacitor is used to output a fourth voltage, and the power end of the control module is connected to the first end of the eleventh capacitor. ;

[0007] Optionally, the explosion-proof circuit further includes: a short-circuit protection module, which includes: a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a fifth resistor, a sixth resistor, a twenty-first capacitor, a twenty-second capacitor and a first operational amplifier, wherein the first end of the fifteenth capacitor is connected to the power bus, the second end of the fifteenth capacitor is grounded, the first end of the sixteenth capacitor is connected to the first end of the fifteenth capacitor, the second end of the sixteenth capacitor is connected to the second end of the fifteenth capacitor, the first end of the seventeenth capacitor is connected to the first end of the sixteenth capacitor, the second end of the seventeenth capacitor is connected to the second end of the sixteenth capacitor, the first end of the eighteenth capacitor is connected to the first end of the seventeenth capacitor, the second end of the eighteenth capacitor is connected to the second end of the seventeenth capacitor, the first end of the nineteenth capacitor is connected to the first end of the eighteenth capacitor, the second end of the nineteenth capacitor is connected to the first end of the fourth resistor, the first end of the twentieth capacitor is connected to the first end of the nineteenth capacitor, and the The second end of the twentieth capacitor is connected to the second end of the nineteenth capacitor, the first end of the fifth resistor is connected to the first end of the eighth capacitor, the first end of the sixth resistor is connected to the second end of the fifth resistor, the first end of the twenty-first capacitor is connected to the second end of the fifth resistor, the second end of the twenty-first capacitor is connected to the second end of the sixth resistor, the second end of the twenty-first capacitor is grounded, the first end of the twenty-second capacitor is connected to the first end of the eighth capacitor, the second end of the twenty-second capacitor is grounded, the non-inverting input end of the first operational amplifier is connected to the first end of the twenty-first capacitor, the inverting input end of the first operational amplifier is connected to the second end of the fourth resistor, the positive power supply of the first operational amplifier is connected to the first end of the twenty-second capacitor, and the negative power supply of the first operational amplifier is connected to the second end of the twenty-first capacitor; wherein the second input end of the control module is connected to the output end of the first operational amplifier, and the control module is used to turn off the motor when the current value of the power bus is greater than the second preset current value.

[0008] Optionally, the explosion-proof circuit also includes: a voltage acquisition module, the voltage acquisition module includes: a seventh resistor, an eighth resistor, a twenty-third capacitor and a ninth resistor, the first end of the seventh resistor is connected to the power bus, the first end of the eighth resistor is connected to the second end of the seventh resistor, the second end of the eighth resistor is grounded, the first end of the twenty-third capacitor is connected to the first end of the eighth resistor, the second end of the twenty-third capacitor is connected to the second end of the eighth resistor, and the first end of the ninth resistor is connected to the second end of the seventh resistor; wherein the third input terminal of the control module is connected to the second end of the ninth resistor, and the control module is used to turn off the motor when the voltage value of the power bus is not within a preset range.

[0009] Optionally, the driving module includes: a switching unit, the switching unit including: a first MOS tube, a tenth resistor, an eleventh resistor, a second MOS tube, a twelfth resistor, a thirteenth resistor, a third MOS tube, a fourteenth resistor, a fifteenth resistor, a fourth MOS tube, a sixteenth resistor, a seventeenth resistor, a fifth MOS tube, an eighteenth resistor, a nineteenth resistor, a sixth MOS tube, a twentieth resistor, a twenty-first resistor and a twenty-second resistor, the drain of the first MOS tube is connected to the first power supply end of the power module, the source of the first MOS tube is connected to the U-phase coil of the motor, the gate of the first MOS tube is connected to the first end of the tenth resistor, the first end of the eleventh resistor is connected to the tenth resistor The first end of the eleventh resistor is connected to the source of the first MOS tube, the drain of the second MOS tube is connected to the first power supply end of the power module, the source of the second MOS tube is connected to the V-phase coil of the motor, the gate of the second MOS tube is connected to the first end of the twelfth resistor, the first end of the thirteenth resistor is connected to the first end of the twelfth resistor, the second end of the thirteenth resistor is connected to the source of the second MOS tube, the drain of the third MOS tube is connected to the first power supply end of the power module, the source of the third MOS tube is connected to the W-phase coil of the motor, the gate of the third MOS tube is connected to the first end of the fourteenth resistor, and the fifteenth resistor is connected to the first end of the fourteenth resistor. The first end of the resistor is connected to the first end of the fourteenth resistor, the second end of the fifteenth resistor is connected to the source of the third MOS tube, the drain of the fourth MOS tube is connected to the U-phase coil of the motor, the source of the fourth MOS tube is connected to the first end of the twenty-second resistor, the gate of the fourth MOS tube is connected to the first end of the sixteenth resistor, the first end of the seventeenth resistor is connected to the first end of the sixteenth resistor, the second end of the seventeenth resistor is connected to the first end of the twenty-second resistor, the drain of the fifth MOS tube is connected to the V-phase coil of the motor, the source of the fifth MOS tube is connected to the first end of the twenty-second resistor, the gate of the fifth MOS tube is connected to the first end of the tenth resistor The first end of the eighth resistor is connected to the first end of the eighth resistor, the first end of the nineteenth resistor is connected to the first end of the eighteenth resistor, the second end of the nineteenth resistor is connected to the first end of the twenty-second resistor, the drain of the sixth MOS tube is connected to the W-phase coil of the motor, the source of the sixth MOS tube is connected to the first end of the twenty-second resistor, the gate of the sixth MOS tube is connected to the first end of the twentieth resistor, the first end of the twenty-first resistor is connected to the first end of the twentieth resistor, the second end of the twenty-first resistor is connected to the first end of the twenty-second resistor, the second end of the twenty-second resistor is grounded, and the first end of the twenty-second resistor is connected to the input end of the current acquisition module; a pre-driving unit,The pre-driving unit includes: a first driving chip, a twenty-fourth capacitor, a third diode, a twenty-fifth capacitor, a fortieth resistor, a forty-third resistor, a second driving chip, a twenty-sixth capacitor, a fourth diode, a twenty-seventh capacitor, a forty-first resistor, a forty-fourth resistor, a third driving chip, a twenty-eighth capacitor, a fifth diode, a twenty-ninth capacitor, a forty-second resistor and a forty-fifth resistor, wherein the first end of the twenty-fourth capacitor is connected to the second power supply end of the power module, the second end of the twenty-fourth capacitor is grounded, the anode of the third diode is connected to the second power supply end of the power module, the cathode of the third diode is connected to the first end of the twenty-fifth capacitor, the power supply end of the first driving chip is connected to the power module The first driving chip is connected to the second power supply end of the first driving chip, the common end of the first driving chip is connected to the second end of the twenty-fourth capacitor, the input high end of the first driving chip is connected to the first end of the fortieth resistor, the input low end of the first driving chip is connected to the first end of the forty-third resistor, the bootstrap high end of the first driving chip is connected to the cathode of the third diode, the high end floating ground end of the first driving chip is connected to the second end of the twenty-fifth capacitor, the output high end of the first driving chip is connected to the second end of the tenth resistor, the output low end of the first driving chip is connected to the second end of the sixteenth resistor, the first end of the twenty-sixth capacitor is connected to the second power supply end of the power supply module, and the second end of the twenty-sixth capacitor is connected to the second power supply end of the power supply module. The anode of the fourth diode is connected to the second power supply terminal of the power module, the cathode of the fourth diode is connected to the first end of the twenty-seventh capacitor, the power supply terminal of the second driver chip is connected to the second power supply terminal of the power module, the common terminal of the second driver chip is connected to the second end of the twenty-sixth capacitor, the input high end of the second driver chip is connected to the first end of the forty-first resistor, the input low end of the second driver chip is connected to the first end of the forty-fourth resistor, the bootstrap high end of the second driver chip is connected to the cathode of the fourth diode, the high end floating ground terminal of the second driver chip is connected to the second end of the twenty-seventh capacitor, the output high end of the second driver chip is connected to the tenth The second end of the second resistor is connected, the output low end of the second driving chip is connected to the second end of the eighteenth resistor, the first end of the twenty-eighth capacitor is connected to the second power supply end of the power module, the second end of the twenty-eighth capacitor is grounded, the anode of the fifth diode is connected to the second power supply end of the power module, the cathode of the fifth diode is connected to the first end of the twenty-ninth capacitor, the power supply end of the third driving chip is connected to the second power supply end of the power module, the common end of the third driving chip is connected to the second end of the twenty-eighth capacitor, the input high end of the third driving chip is connected to the first end of the forty-second resistor, and the input low end of the third driving chip is connected to the first end of the forty-fifth resistor.The bootstrap high end of the third driver chip is connected to the cathode of the fifth diode, the high end floating ground end of the third driver chip is connected to the second end of the 29th capacitor, the output high end of the third driver chip is connected to the second end of the 14th resistor, and the output low end of the third driver chip is connected to the second end of the 20th resistor; wherein the first output end of the control module is connected to the second end of the 40th resistor, the second output end of the control module is connected to the second end of the 43rd resistor, the third output end of the control module is connected to the second end of the 41st resistor, the fourth output end of the control module is connected to the second end of the 44th resistor, the fifth output end of the control module is connected to the second end of the 42nd resistor, and the sixth output end of the control module is connected to the second end of the 45th resistor.

[0010] Optionally, the explosion-proof circuit also includes: a temperature acquisition module, the temperature acquisition module includes: a twenty-third resistor, a thirtieth capacitor and a thermistor, the first end of the twenty-third resistor is connected to the fourth power supply end of the power supply module, the first end of the thirtieth capacitor is connected to the second end of the twenty-third resistor, the second end of the thirtieth capacitor is grounded, the thermistor is arranged on the switch unit, the first end of the thermistor is connected to the first end of the thirtieth capacitor, and the second end of the thermistor is connected to the second end of the thirtieth capacitor; wherein the fourth input end of the control module is connected to the first end of the thirtieth capacitor, and the control module is used to turn off the motor when the temperature of the switch unit is greater than a preset temperature value.

[0011] Optionally, the current acquisition module includes: a twenty-fourth resistor, a thirty-first capacitor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a thirty-second capacitor and a second operational amplifier, wherein the first end of the twenty-fourth resistor is connected to the driving end of the driving module, the second end of the twenty-fourth resistor is connected to the non-inverting input end of the second operational amplifier, the first end of the thirty-first capacitor is connected to the second end of the twenty-fourth resistor, the second end of the thirty-first capacitor is grounded, the first end of the twenty-fifth resistor is grounded, the second end of the twenty-fifth resistor is connected to the inverting input end of the second operational amplifier, the positive power supply of the second operational amplifier is connected to the third power supply end of the power supply module, the negative power supply of the second operational amplifier is grounded, the first end of the twenty-sixth resistor is connected to the second end of the twenty-fifth resistor, the second end of the twenty-sixth resistor is connected to the output end of the second operational amplifier, the first end of the twenty-seventh resistor is connected to the output end of the second operational amplifier, the second end of the twenty-seventh resistor is connected to the first end of the thirty-second capacitor, and the second end of the thirty-second capacitor is grounded; wherein the fifth input end of the control module is connected to the first end of the thirty-second capacitor.

[0012] Optionally, the explosion-proof circuit also includes: a back-EMF acquisition module, which includes: a twenty-eighth resistor, a twenty-ninth resistor, a thirty-third capacitor, a thirtieth resistor, a thirty-first resistor, a thirty-fourth capacitor, a thirty-second resistor, a thirty-third resistor and a thirty-fifth capacitor, the first end of the twenty-eighth resistor is connected to the U-phase coil of the motor, the second end of the twenty-eighth resistor is connected to the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is grounded, the first end of the thirty-third capacitor is connected to the first end of the twenty-ninth resistor, the second end of the thirty-third capacitor is connected to the second end of the twenty-ninth resistor, the first end of the 30th resistor is connected to the V-phase coil of the motor, the second end of the 30th resistor is connected to the first end of the thirty-first resistor, the second end of the thirty-first resistor is grounded, and the The first end of the capacitor is connected to the first end of the thirty-first resistor, the second end of the thirty-fourth capacitor is connected to the second end of the thirty-first resistor, the first end of the thirty-second resistor is connected to the W-phase coil of the motor, the second end of the thirty-second resistor is connected to the first end of the thirty-third resistor, the second end of the thirty-third resistor is grounded, the first end of the thirty-fifth capacitor is connected to the first end of the thirty-third resistor, and the second end of the thirty-fifth capacitor is connected to the second end of the thirty-third resistor; wherein the sixth input terminal of the control module is connected to the first end of the thirty-third capacitor, the sixth input terminal of the control module is connected to the first end of the thirty-fourth capacitor, and the seventh input terminal of the control module is connected to the first end of the thirty-fifth capacitor, and the control module is used to turn off the motor when the back electromotive force of the motor is greater than the preset electromotive force.

[0013] Optionally, the control module includes: a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-fourth resistor, a thirty-ninth capacitor, a sixth diode, a thirty-fifth resistor, a thirty-sixth resistor, a forty-first capacitor, a thirty-eighth resistor, a forty-second capacitor, a forty-sixth resistor, a forty-seventh resistor, a light-emitting diode and a control chip, the first end of the thirty-sixth capacitor is connected to the fourth power supply end of the power supply module, the second end of the thirty-sixth capacitor is grounded, the first end of the thirty-seventh capacitor is connected to the first end of the thirty-sixth capacitor, the second end of the thirty-seventh capacitor is connected to the second end of the thirty-sixth capacitor, and the first end of the thirty-eighth capacitor is connected to the fourth power supply end of the power supply module. The first end of the thirty-eighth capacitor is connected to the first end of the thirty-eighth capacitor, the second end of the thirty-seventh capacitor is connected to the first end of the control chip, the first power supply positive electrode of the control chip is connected to the first end of the thirty-seventh capacitor, the first power supply negative electrode and the startup configuration end of the control chip are respectively connected to the second end of the thirty-eighth capacitor, the first communication end of the control chip is used to pass the commutation signal, the first end of the thirty-fourth resistor is connected to the first communication end of the control chip, the second end of the thirty-fourth resistor is connected to the first end of the thirty-ninth capacitor, the second end of the thirty-ninth capacitor is grounded, the cathode of the sixth diode is used to pass the switch signal, the first end of the thirty-fifth resistor is connected to the fourth end of the power module The first end of the thirty-sixth resistor is connected to the second end of the thirty-fifth resistor, the second end of the thirty-sixth resistor is connected to the second communication end of the control chip, the first end of the fortieth capacitor is connected to the second end of the thirty-sixth resistor, the second end of the fortieth capacitor is grounded, the first end of the thirty-seventh resistor is connected to the fourth power supply end of the power supply module, the second end of the thirty-seventh resistor is connected to the reset end of the control chip, the first end of the forty-first capacitor is connected to the second end of the thirty-seventh resistor, the second end of the forty-first capacitor is grounded, the first end of the thirty-eighth resistor is connected to the second end of the thirty-seventh resistor, the second end of the forty-first capacitor is grounded, the speed signal is input to the first end of the thirty-eighth resistor, and the third The second end of the eighteenth resistor is connected to the third communication end of the control chip, the first end of the forty-second capacitor is connected to the fourth power supply end of the power module, the second end of the forty-second capacitor is grounded, the third power positive electrode of the control chip is connected to the first end of the forty-second capacitor, the third power negative electrode of the control chip is connected to the second end of the forty-second capacitor, the first debugging end and the second debugging end of the control chip are used to pass debugging signals, the first end of the forty-sixth resistor is connected to the first debugging end of the control chip, the second end of the forty-sixth resistor is grounded, the first end of the forty-seventh resistor is connected to the fourth communication end of the control chip, and the second end of the forty-seventh resistor is connected to the anode of the light-emitting diode.The cathode of the light emitting diode is grounded, and the fifth communication terminal of the control chip is connected to the output terminal of the current acquisition module.

[0014] A second aspect of the present disclosure provides a handheld electric tool, comprising: an explosion-proof circuit for coal mines as provided in the first aspect of the present disclosure.

[0015] The technical solution provided by the present disclosure may have the following beneficial effects:

[0016] The control module can use the current acquisition module to obtain the current value of the motor, and when the current value of the motor is greater than the first preset current value, the control module can use the drive module to shut down the motor and restart the motor after a preset time, and when the number of restarts of the motor is greater than the preset number, the control module can use the drive module to shut down the motor, thereby realizing current protection of the motor and improving the explosion-proof performance of the motor. When the explosion-proof circuit is applied to power tools, it can meet the safety production needs of industries such as coal mines.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 It is a circuit diagram of an explosion-proof circuit for coal mines proposed in one embodiment of the present disclosure;

[0020] Figure 2 It is a circuit diagram of a first conversion unit in an explosion-proof circuit for coal mines proposed in an embodiment of the present disclosure;

[0021] Figure 3 It is a circuit diagram of a second conversion unit and a third conversion unit in an explosion-proof circuit for coal mines proposed in an embodiment of the present disclosure;

[0022] Figure 4 It is a circuit diagram of a short-circuit protection module in an explosion-proof circuit for coal mines proposed in one embodiment of the present disclosure;

[0023] Figure 5 It is a circuit diagram of a voltage acquisition module in an explosion-proof circuit for coal mines proposed in an embodiment of the present disclosure;

[0024] Figure 6 It is a circuit diagram of a switch unit in an explosion-proof circuit for coal mines proposed in one embodiment of the present disclosure;

[0025] Figure 7It is a circuit diagram of a pre-driving unit in an explosion-proof circuit for coal mines proposed in an embodiment of the present disclosure;

[0026] Figure 8 It is a circuit diagram of a temperature acquisition module in an explosion-proof circuit for coal mines proposed in an embodiment of the present disclosure;

[0027] Fig. 9 It is a circuit diagram of a current acquisition module in an explosion-proof circuit for coal mines proposed in an embodiment of the present disclosure;

[0028] Fig.10 It is a circuit diagram of a back-electromotive force acquisition module in an explosion-proof circuit for coal mines proposed in an embodiment of the present disclosure;

[0029] Fig.11 It is a circuit diagram of a control module in an explosion-proof circuit for coal mines proposed in one embodiment of the present disclosure;

[0030] As shown in the figure: 1. Power module, 2. Drive module, 3. Current acquisition module, 4. Control module, 5. Short circuit protection module, 6. Voltage acquisition module, 7. Temperature acquisition module, 8. Back electromotive force acquisition module;

[0031] RT, thermistor, R1, the first resistor, R2, the second resistor, R3, the third resistor, R4, the fourth resistor, R5, the fifth resistor, R6, the sixth resistor, R7, the seventh resistor, R8, the eighth resistor, R9, the ninth resistor, R10, the tenth resistor, R11, the eleventh resistor, R12, the twelfth resistor, R13, the thirteenth resistor, R14, the fourteenth resistor, R15, the fifteenth resistor, R16, the sixteenth resistor, R17, the seventeenth resistor, R18, the eighteenth resistor, R19, the nineteenth resistor, R20, the twentieth resistor, R21, the twenty-first resistor, R22, the twenty-second resistor, R23, the twenty-third resistor, R24, the twenty-fourth resistor, R25, the twenty-fifth resistor resistance, R26, the twenty-sixth resistor, R27, the twenty-seventh resistor, R28, the twenty-eighth resistor, R29, the twenty-ninth resistor, R30, the thirtieth resistor, R31, the thirty-first resistor, R32, the thirty-second resistor, R33, the thirty-third resistor, R34, the thirty-fourth resistor, R35, the thirty-fifth resistor, R36, the thirty-sixth resistor, R37, the thirty-seventh resistor, R38, the thirty-eighth resistor, R39, the thirty-ninth resistor, R40, the fortieth resistor, R41, the forty-first resistor, R42, the forty-second resistor, R43, the forty-third resistor, R44, the forty-fourth resistor, R45, the forty-fifth resistor, R46, the forty-sixth resistor, R47, the forty-seventh resistor;

[0032] C1, the first capacitor, C2, the second capacitor, C3, the third capacitor, C4, the fourth capacitor, C5, the fifth capacitor, C6, the sixth capacitor, C7, the seventh capacitor, C8, the eighth capacitor, C9, the ninth capacitor, C10, the tenth capacitor, C11, the eleventh capacitor, C12, the twelfth capacitor, C13, the thirteenth capacitor, C14, the fourteenth capacitor, C15, the fifteenth capacitor, C16, the sixteenth capacitor, C17, the seventeenth capacitor, C18, the eighteenth capacitor, C19, the nineteenth capacitor, C20, the twentieth capacitor, C21, the twenty-first capacitor, C22, the twenty-second capacitor, C23, the twentieth capacitor three capacitors, C24, the twenty-fourth capacitor, C25, the twenty-fifth capacitor, C26, the twenty-sixth capacitor, C27, the twenty-seventh capacitor, C28, the twenty-eighth capacitor, C29, the twenty-ninth capacitor, C30, the thirtieth capacitor, C31, the thirty-first capacitor, C32, the thirty-second capacitor, C33, the thirty-third capacitor, C34, the thirty-fourth capacitor, C35, the thirty-fifth capacitor, C36, the thirty-sixth capacitor, C37, the thirty-seventh capacitor, C38, the thirty-eighth capacitor, C39, the thirty-ninth capacitor, C40, the thirtieth capacitor, C41, the forty-first capacitor, and C42, the forty-second capacitor;

[0033] Q1, the first MOS tube, Q2, the second MOS tube, Q3, the third MOS tube, Q4, the fourth MOS tube, Q5, the fifth MOS tube, Q6, the sixth MOS tube;

[0034] D1, a first diode, D2, a second diode, D3, a third diode, D4, a fourth diode, D5, a fifth diode, and D6, a sixth diode;

[0035] U1, boost chip, U2, first buck chip, U3, second buck chip, U4, first driver chip, U5, second driver chip, U6, third driver chip, U7, control chip;

[0036] OP1, a first operational amplifier, OP2, a second operational amplifier;

[0037] LED, light emitting diode;

[0038] L, inductance;

[0039] B. Power bus. DETAILED DESCRIPTION

[0040] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0041] like Figure 1 As shown, the embodiment of the present disclosure proposes an explosion-proof circuit for coal mines, including: a power supply module 1, a drive module 2, a current acquisition module 3 and a control module 4, wherein a first power supply end of the power supply module 1 is connected to a power supply end of a motor, a drive end of the drive module 2 is arranged between the power supply module 1 and the motor, the drive module 2 is used to drive the motor, an input end of the current acquisition module 3 is connected to a drive end of the drive module 2, the current acquisition module 3 is used to collect the current of the motor, a first input end of the control module 4 is connected to an output end of the current acquisition module 3, an output end of the control module 4 is connected to an input end of the drive module 2, and the control module 4 is used to turn off the motor when the current value of the motor is greater than a first preset current value and restart the motor after a preset time, and to turn off the motor when the number of restarts of the motor is greater than a preset number.

[0042] It can be understood that since the first power supply end of the power module 1 is connected to the power supply end of the motor, the driving end of the driving module 2 is arranged between the power module 1 and the motor, so that the driving end of the driving module 2 can convert the electric energy between the first power supply end of the power module 1 and the power supply end of the motor, thereby realizing the driving of the motor. At the same time, since the input end of the current acquisition module 3 is connected to the driving end of the driving module 2, the current acquisition module 3 can use the driving end of the driving module 2 to collect the current of the motor.

[0043] Therefore, the control module 4 can use the current acquisition module 3 to obtain the current value of the motor, and when the current value of the motor is greater than the first preset current value, the control module 4 can use the drive module 2 to shut down the motor and restart the motor after a preset time, and when the number of restarts of the motor is greater than the preset number, the control module 4 can use the drive module 2 to shut down the motor, thereby realizing current protection of the motor and improving the explosion-proof performance of the motor, and then when the explosion-proof circuit is applied to power tools, it can meet the safety production needs of industries such as coal mines.

[0044] It should be noted that when the current value of the motor is greater than the first preset current value, it indicates that the current of the motor is too large, and continued operation is prone to malfunction. Therefore, the control module 4 uses the drive module 2 to shut down the motor, which can avoid the occurrence of fire, explosion and the like. At the same time, the control module 4 does not directly and permanently shut down the motor, but permanently shuts down the motor when the number of motor restarts is greater than the preset number. This method can avoid misjudgment problems and improve the operating efficiency of the motor while ensuring the safe operation of the motor.

[0045] The first preset current value and the preset number of times can be set according to actual needs, and there is no restriction on this. Wherein, when the number of restarts of the motor is greater than the preset number of times, the motor is turned off and can only be restarted again after the whole motor is powered on again.

[0046] The power module 1 is used to supply power to the motor, and can also supply power to the drive module 2, the current acquisition module 3, the control module 4, etc. The specific type of the power module 1 can be set according to actual needs and is not limited to this.

[0047] The driving module 2 is used to drive the motor. The driving module 2 can be used to control the start and stop of the motor, the steering direction, the speed, etc. The specific type of the driving module 2 can be set according to actual needs and is not limited to this.

[0048] The current acquisition module 3 is used for collecting the motor current. The specific type of the current acquisition module 3 can be set according to actual needs and is not limited to this.

[0049] The control module 4 is used for the operation control and explosion-proof protection of the motor. The specific type of the control module 4 can be set according to actual needs and is not limited to this.

[0050] like Figure 2 and Figure 3 As shown, in some embodiments, the power module 1 includes: a power bus B, a first conversion unit, a second conversion unit and a third conversion unit.

[0051] The power bus B is used to output the bus voltage, the power bus B is connected to the power end of the motor, and the driving end of the driving module 2 is arranged between the power bus B and the motor.

[0052] The first conversion unit includes: a boost chip U1, a first capacitor C1, a second capacitor C2, a first diode D1, a third capacitor C3, a first resistor R1, a thirty-ninth resistor R39, an inductor L, a second diode D2, a second resistor R2, a third resistor R3, a fourth capacitor C4 and a fifth capacitor C5, a first end of the first capacitor C1 is connected to the power bus B, a second end of the first capacitor C1 is grounded, a first end of the second capacitor C2 is connected to the first end of the first capacitor C1, a second end of the second capacitor C2 is connected to the second end of the first capacitor C1, an anode of the first diode D1 is connected to the first end of the second capacitor C2, a cathode of the first diode D1 is connected to the input end of the boost chip U1, a first end of the third capacitor C3 is connected to the cathode of the first diode D1, a second end of the third capacitor C3 is connected to the second end of the second capacitor C2, a first end of the first resistor R1 is grounded, and a second end of the first resistor R1 is grounded. The first end of the thirty-ninth resistor R39 is connected to the enable end of the boost chip U1, the second end of the thirty-ninth resistor R39 is connected to the second end of the first resistor R1, and the second end of the thirty-ninth resistor R39 is used to pass the enable signal, so the first end of the inductor L is connected to the input end of the boost chip U1, the second end of the inductor L is connected to the output end of the boost chip U1, the anode of the second diode D2 is connected to the output end of the boost chip U1, the first end of the fourth capacitor C4 is grounded, the second end of the fourth capacitor C4 is connected to the cathode of the second diode D2, the first end of the fifth capacitor C5 is connected to the first end of the fourth capacitor C4, the second end of the fifth capacitor C5 is connected to the second end of the fourth capacitor C4, the first end of the second resistor R2 is connected to the feedback end of the boost chip U1, the second end of the second resistor R2 is connected to the cathode of the second diode D2, the first end of the third resistor R3 is grounded, and the second end of the third resistor R3 is connected to the first end of the second resistor R2.

[0053] The second conversion unit includes: a first buck chip U2, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8, the first end of the sixth capacitor C6 is connected to the first end of the third capacitor C3, the second end of the sixth capacitor C6 is grounded, the input end of the first buck chip U2 is connected to the first end of the sixth capacitor C6, the first ground end of the first buck chip U2 is connected to the second end of the sixth capacitor C6, the first end of the seventh capacitor C7 is connected to the output end of the first buck chip U2, the second end of the seventh capacitor C7 is connected to the second ground end of the first buck chip U2, the first end of the eighth capacitor C8 is connected to the first end of the seventh capacitor C7, the second end of the eighth capacitor C8 is connected to the second end of the seventh capacitor C7, and the second end of the eighth capacitor C8 is grounded.

[0054] The third conversion unit includes: a second buck chip U3, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13 and a fourteenth capacitor C14, a first end of the ninth capacitor C9 is connected to a first end of the eighth capacitor C8, a second end of the ninth capacitor C9 is connected to a second end of the eighth capacitor C8, a first end of the tenth capacitor C10 is connected to a first end of the ninth capacitor C9, a second end of the tenth capacitor C10 is connected to a second end of the ninth capacitor C9, an input end and a flash memory end of the second buck chip U3 are respectively connected to a first end of the tenth capacitor C10, a ground end of the second buck chip U3 is connected to a second end of the tenth capacitor C10 The first end of the eleventh capacitor C11 is connected to the output end of the second step-down chip U3, the second end of the eleventh capacitor C11 is connected to the ground end of the second step-down chip U3, the first end of the twelfth capacitor C12 is connected to the first end of the eleventh capacitor C11, the second end of the twelfth capacitor C12 is connected to the second end of the eleventh capacitor C11, the first end of the thirteenth capacitor C13 is connected to the first end of the twelfth capacitor C12, the second end of the thirteenth capacitor C13 is connected to the second end of the twelfth capacitor C12, the first end of the fourteenth capacitor C14 is connected to the first end of the thirteenth capacitor C13, and the second end of the fourteenth capacitor C14 is connected to the second end of the thirteenth capacitor C13.

[0055] The power bus B is used to output a first voltage, the second end of the fifth capacitor C5 is used to output a second voltage, the power end of the driving module 2 is connected to the second end of the fifth capacitor C5, the first end of the eighth capacitor C8 is used to output a third voltage, the power end of the current acquisition module 3 is connected to the first end of the eighth capacitor C8, the first end of the eleventh capacitor C11 is used to output a fourth voltage, and the power end of the control module 4 is connected to the first end of the eleventh capacitor C11.

[0056] It can be understood that since the power bus B is connected to the power end of the motor, and the driving end of the drive module 2 is arranged between the power bus B and the motor, the power bus B can supply power to the motor. At the same time, the power conversion of the drive module 2 can realize the driving of the motor and then realize the operation of the motor.

[0057] Through the cooperation of the boost chip U1, the first capacitor C1, the second capacitor C2, the first diode D1, the third capacitor C3, the first resistor R1, the thirty-ninth resistor R39, the inductor L, the second diode D2, the second resistor R2, the third resistor R3, the fourth capacitor C4 and the fifth capacitor C5, the boost conversion from the first voltage to the second voltage is achieved, thereby meeting the power demand of the drive module 2, etc., and further ensuring the stable protection of the motor by the explosion-proof circuit.

[0058] Through the cooperation of the first step-down chip U2, the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8, the step-down conversion from the first voltage to the third voltage is achieved, thereby meeting the power demand of the current acquisition module 3, etc., and further ensuring the stable protection of the motor by the explosion-proof circuit.

[0059] Through the cooperation of the second step-down chip U3, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13 and the fourteenth capacitor C14, the step-down conversion from the third voltage to the fourth voltage is achieved, thereby meeting the power demand of the control module 4, etc., and further ensuring the stable protection of the motor by the explosion-proof circuit.

[0060] It should be noted that the first diode D1 and the second diode D2 utilize unidirectional conduction characteristics to achieve reverse connection protection. The specific types of the first diode D1 and the second diode D2 can be set according to actual needs and are not limited to this. For example, the model of the first diode D1 can be IN4148, and the model of the second diode D2 can be DSS210.

[0061] The first capacitor C1 and the second capacitor C2 are used for input filtering, and the third capacitor C3 is used for filtering at the rear end of the reverse connection protection of the first diode D1. The specific values ​​of the first capacitor C1, the second capacitor C2 and the third capacitor C3 can be set according to actual needs and are not limited to this. For example, the values ​​of the first capacitor C1 and the second capacitor C2 can both be 100 μF, and the value of the third capacitor C3 can be 22 μF.

[0062] The inductor L is used for filtering. The specific value of the inductor L can be set according to actual needs, and there is no limitation to this. For example, the value of the inductor L can be 4.7 μH.

[0063] The first resistor R1 is used for grounding protection. The specific value of the first resistor R1 can be set according to actual needs and is not limited thereto. For example, the value of the first resistor R1 can be 10k.

[0064] The second resistor R2 and the third resistor R3 are used to form a voltage divider network. The specific values ​​of the second resistor R2 and the third resistor R3 can be set according to actual needs and are not limited to this. For example, the value of the second resistor R2 can be 91k, and the value of the third resistor R3 can be 5.6k.

[0065] The thirty-ninth resistor R39 is used for voltage division and current limiting. The specific value of the thirty-ninth resistor R39 can be set according to actual needs and is not limited to this. For example, the value of the thirty-ninth resistor R39 can be 1k.

[0066] The fourth capacitor C4 and the fifth capacitor C5 are used for output filtering. The specific values ​​of the fourth capacitor C4 and the fifth capacitor C5 can be set according to actual needs, and there is no limitation to this. For example, the values ​​of the fourth capacitor C4 and the fifth capacitor C5 can both be 10 μF.

[0067] The boost chip U1 is used for boost conversion. The specific type of the boost chip U1 can be set according to actual needs and is not limited to this. For example, the model of the boost chip U1 can be MT3608. The MT3608 chip is a constant frequency, six-pin SOT23 current mode boost converter. The switching frequency of the MT3608 chip is 1.2MHz. The MT3608 chip includes undervoltage lockout, current limiting and thermal overload protection to prevent damage in the event of an output overload. Specifically, the boost chip U1 has a first pin (output terminal SW), a second pin (ground terminal GND), a third pin (feedback terminal FB), a fourth pin (enable terminal EN), a fifth pin (input terminal IN), etc.

[0068] When the enable terminal of the boost chip U1 is converted from a low level to a high level, the boost chip U1 starts to work.

[0069] The second voltage may be 12V.

[0070] The sixth capacitor C6 is used for input filtering. The specific value of the sixth capacitor C6 can be set according to actual needs, and there is no limitation to this. For example, the value of the sixth capacitor C6 can be 10 μF.

[0071] The seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13 and the fourteenth capacitor C14 respectively constitute the power supply network of the second conversion unit and the third conversion unit. The specific values ​​of the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13 and the fourteenth capacitor C14 can be set according to actual needs and are not limited to this. For example, the value of the seventh capacitor C7 can be 0.1 μF, the value of the eighth capacitor C8 can be 0.1 μF, the value of the ninth capacitor C9 can be 10 μF, the value of the tenth capacitor C10 can be 10 μF, the value of the eleventh capacitor C11 can be 10 μF, the value of the twelfth capacitor C12 can be 2.2 μF, the value of the thirteenth capacitor C13 can be 10 μF, and the value of the fourteenth capacitor C14 can be 10 μF.

[0072] The first buck chip U2 is used for buck conversion. The specific type of the first buck chip U2 can be set according to actual needs and is not limited to this. For example, the model of the first buck chip U2 can be K7805MT-1000R4. The K7805MT-1000R4 chip is a DC-DC non-isolated voltage-stabilized power supply module 1. Specifically, the first buck chip U2 has a first pin (input terminal +VIN), a second pin (first ground terminal GND), a third pin (output terminal +V0), a fifth pin (second ground terminal GND), etc.

[0073] The second buck chip U3 is used for buck conversion. The specific type of the second buck chip U3 can be set according to actual needs and is not limited to this. For example, the model of the second buck chip U3 can be ME6215C33M5G. ME6215C33M5G is a high-precision, low-power, high-voltage, positive voltage regulator manufactured using CMOS and laser trimming technology. Specifically, the second buck chip U3 has a first pin (input terminal VIN), a second pin (ground terminal GND), a third pin (flash memory terminal CE), a fifth pin (output terminal Vout), etc.

[0074] The third voltage may be 5V, and the fourth voltage may be 3.3V.

[0075] like Figure 4As shown, in some embodiments, the explosion-proof circuit further includes: a short-circuit protection module 5, the short-circuit protection module 5 includes: a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a fifth resistor R5, a sixth resistor R6, a twenty-first capacitor C21, a twenty-second capacitor C22 and a first operational amplifier OP1, a first end of the fifteenth capacitor C15 is connected to the power bus B, a second end of the fifteenth capacitor C15 is grounded, and a first end of the sixteenth capacitor C16 is connected to the power bus B, The first end of the fifteenth capacitor C15 is connected to the first end of the fifteenth capacitor C15, the second end of the sixteenth capacitor C16 is connected to the second end of the fifteenth capacitor C15, the first end of the seventeenth capacitor C17 is connected to the first end of the sixteenth capacitor C16, the second end of the seventeenth capacitor C17 is connected to the second end of the sixteenth capacitor C16, the first end of the eighteenth capacitor C18 is connected to the first end of the seventeenth capacitor C17, the second end of the eighteenth capacitor C18 is connected to the second end of the seventeenth capacitor C17, the first end of the nineteenth capacitor C19 is connected to the first end of the eighteenth capacitor C18, and the first end of the eighteenth capacitor C19 is connected to the first end of the eighteenth capacitor C18. The second end of the nineteenth capacitor C19 is connected to the first end of the fourth resistor R4, the first end of the twentieth capacitor C20 is connected to the first end of the nineteenth capacitor C19, the second end of the twentieth capacitor C20 is connected to the second end of the nineteenth capacitor C19, the first end of the fifth resistor R5 is connected to the first end of the eighth capacitor C8, the first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, the first end of the twenty-first capacitor C21 is connected to the second end of the fifth resistor R5, the second end of the twenty-first capacitor C21 is connected to the second end of the sixth resistor R6, the second end of the twenty-first capacitor C21 is grounded, the first end of the twenty-second capacitor C22 is connected to the first end of the eighth capacitor C8, the second end of the twenty-second capacitor C22 is grounded, the non-inverting input end of the first operational amplifier OP1 is connected to the first end of the twenty-first capacitor C21, the inverting input end of the first operational amplifier OP1 is connected to the second end of the fourth resistor R4, the positive power supply electrode of the first operational amplifier OP1 is connected to the first end of the twenty-second capacitor C22, and the negative power supply electrode of the first operational amplifier OP1 is connected to the second end of the twenty-first capacitor C21.

[0076] The second input terminal of the control module 4 is connected to the output terminal of the first operational amplifier OP1, and the control module 4 is used to turn off the motor when the current value of the power bus B is greater than the second preset current value.

[0077] It can be understood that the fifth resistor R5, the sixth resistor R6 and the twenty-first capacitor C21 constitute a fixed voltage protection point. When the current value of the power bus B is greater than the second preset current value, the output end of the first operational amplifier OP1 realizes a level flip, and the control module 4 turns off the motor according to the output signal of the first operational amplifier OP1, thereby realizing short-circuit protection of the motor, thereby improving the explosion-proof performance of the motor.

[0078] It should be noted that the fifteenth capacitor C15, the sixteenth capacitor C16, the seventeenth capacitor C17, the eighteenth capacitor C18, the nineteenth capacitor C19 and the twentieth capacitor C20 are used for filtering the power bus B. The specific values ​​of the fifteenth capacitor C15, the sixteenth capacitor C16, the seventeenth capacitor C17, the eighteenth capacitor C18, the nineteenth capacitor C19 and the twentieth capacitor C20 can be set according to actual needs and are not limited to this. For example, the values ​​of the fifteenth capacitor C15, the sixteenth capacitor C16, the seventeenth capacitor C17, the eighteenth capacitor C18, the nineteenth capacitor C19 and the twentieth capacitor C20 can all be 10 μF.

[0079] The fifth resistor R5, the sixth resistor R6 and the twenty-first capacitor C21 constitute a fixed voltage protection point. The signal value of the inverting input terminal of the first operational amplifier OP1 is proportional to the current value of the power bus B, and the signal value of the non-inverting input terminal of the first operational amplifier OP1 is proportional to the second preset current value. The specific values ​​of the fifth resistor R5, the sixth resistor R6 and the twenty-first capacitor C21 can be set according to actual needs and are not limited to this. For example, the value of the fifth resistor R5 can be 30k, the value of the sixth resistor R6 can be 2k, and the value of the twenty-first capacitor C21 can be 100nF.

[0080] The twenty-second capacitor C22 is used for voltage stabilization. The specific value of the twenty-second capacitor C22 can be set according to actual needs and is not limited thereto. For example, the value of the twenty-second capacitor C22 can be 100 nF.

[0081] The specific type of the first operational amplifier OP1 can be set according to actual needs, and there is no limitation on this. For example, the model of the first operational amplifier OP1 can be LM358.

[0082] like Figure 5 As shown, in some embodiments, the explosion-proof circuit further includes: a voltage acquisition module 6, the voltage acquisition module 6 includes: a seventh resistor R7, an eighth resistor R8, a twenty-third capacitor C23 and a ninth resistor R9, the first end of the seventh resistor R7 is connected to the power bus B, the first end of the eighth resistor R8 is connected to the second end of the seventh resistor R7, the second end of the eighth resistor R8 is grounded, the first end of the twenty-third capacitor C23 is connected to the first end of the eighth resistor R8, the second end of the twenty-third capacitor C23 is connected to the second end of the eighth resistor R8, and the first end of the ninth resistor R9 is connected to the second end of the seventh resistor R7.

[0083] The third input terminal of the control module 4 is connected to the second terminal of the ninth resistor R9, and the control module 4 is used to turn off the motor when the voltage value of the power bus B is not within a preset range.

[0084] It can be understood that through the cooperation of the seventh resistor R7, the eighth resistor R8, the twenty-third capacitor C23 and the ninth resistor R9, the detection of the voltage of the power bus B is realized, so that when the voltage value of the power bus B is not within the preset range, the control module 4 can use the drive module 2 to shut down the motor, thereby realizing the protection of the motor and further improving the explosion-proof performance of the motor.

[0085] It should be noted that the seventh resistor R7 and the eighth resistor R8 form a voltage divider network. The specific values ​​of the seventh resistor R7 and the eighth resistor R8 can be set according to actual needs and are not limited to this. For example, the value of the seventh resistor R7 can be 47k.

[0086] The twenty-third capacitor C23 is used for filtering. The specific value of the twenty-third capacitor C23 can be set according to actual needs and is not limited to this. For example, the value of the twenty-third capacitor C23 can be 100nF.

[0087] The specific value of the ninth resistor R9 can be set according to actual needs, and there is no limitation on this. For example, the value of the ninth resistor R9 can be 0 ohm.

[0088] like Figure 6 and Figure 7 As shown, in some embodiments, the driving module 2 includes: a switch unit and a pre-driving unit.

[0089] The switch unit includes: a first MOS tube Q1, a tenth resistor R10, an eleventh resistor R11, a second MOS tube Q2, a twelfth resistor R12, a thirteenth resistor R13, a third MOS tube Q3, a fourteenth resistor R14, a fifteenth resistor R15, a fourth MOS tube Q4, a sixteenth resistor R16, a seventeenth resistor R17, a fifth MOS tube Q5, an eighteenth resistor R18, a nineteenth resistor R19, a sixth MOS tube Q6, a twentieth resistor R20, a twenty-first resistor R21 and a twenty-second resistor R22, a drain of the first MOS tube Q1 is connected to the first power supply end of the power module 1, a source of the first MOS tube Q1 is connected to the U-phase coil of the motor, and a gate of the first MOS tube Q1 is connected to the tenth resistor R The first end of the eleventh resistor R11 is connected to the first end of the tenth resistor R10, the second end of the eleventh resistor R11 is connected to the source of the first MOS tube Q1, the drain of the second MOS tube Q2 is connected to the first power supply end of the power module 1, the source of the second MOS tube Q2 is connected to the V-phase coil of the motor, the gate of the second MOS tube Q2 is connected to the first end of the twelfth resistor R12, the first end of the thirteenth resistor R13 is connected to the first end of the twelfth resistor R12, the second end of the thirteenth resistor R13 is connected to the source of the second MOS tube Q2, the drain of the third MOS tube Q3 is connected to the first power supply end of the power module 1, the source of the third MOS tube Q3 is connected to the W-phase coil of the motor, and the gate of the second MOS tube Q2 is connected to the first end of the twelfth resistor R12. The gate of the fourth MOS tube Q4 is connected to the first end of the sixteenth resistor R16, the first end of the seventeenth resistor R17 is connected to the first end of the sixteenth resistor R16, the second end of the seventeenth resistor R17 is connected to the first end of the twenty-second resistor R22, the drain of the fifth MOS tube Q5 is connected to the V-phase coil of the motor, the source of the fifth MOS tube Q5 is connected to the first end of the twenty-second resistor R22, the gate of the fourth MOS tube Q4 is connected to the first end of the sixteenth resistor R16, the first end of the seventeenth resistor R17 is connected to the first end of the sixteenth resistor R16, the second end of the seventeenth resistor R17 is connected to the first end of the twenty-second resistor R22, the drain of the fifth MOS tube Q5 is connected to the V-phase coil of the motor, the source of the fifth MOS tube Q5 is connected to the first end of the twenty-second resistor R22, The first end of the resistor R22 is connected, the gate of the fifth MOS tube Q5 is connected to the first end of the eighteenth resistor R18, the first end of the nineteenth resistor R19 is connected to the first end of the eighteenth resistor R18, the second end of the nineteenth resistor R19 is connected to the first end of the twenty-second resistor R22, the drain of the sixth MOS tube Q6 is connected to the W-phase coil of the motor, the source of the sixth MOS tube Q6 is connected to the first end of the twenty-second resistor R22, the gate of the sixth MOS tube Q6 is connected to the first end of the twenty-first resistor R20, the first end of the twenty-first resistor R21 is connected to the first end of the twenty-second resistor R20, the second end of the twenty-first resistor R21 is connected to the first end of the twenty-second resistor R22, and the second end of the twenty-second resistor R22 is grounded.The first end of the twenty-second resistor R22 is connected to the input end of the current acquisition module 3.

[0090] The pre-driving unit includes: a first driving chip U4, a twenty-fourth capacitor C24, a third diode D3, a twenty-fifth capacitor C25, a fortieth resistor R40, a forty-third resistor R43, a second driving chip U5, a twenty-sixth capacitor C26, a fourth diode D4, a twenty-seventh capacitor C27, a forty-first resistor R41, a forty-fourth resistor R44, a third driving chip U6, a twenty-eighth capacitor C28, a fifth diode D5, a twenty-ninth capacitor C29, a forty-second resistor R42 and a forty-fifth resistor R45, the first end of the twenty-fourth capacitor C24 is connected to the second power supply end of the power module 1, the second end of the twenty-fourth capacitor C24 is grounded, and the anode of the third diode D3 is connected to the second power supply end of the power module 1 , the cathode of the third diode D3 is connected to the first end of the twenty-fifth capacitor C25, the power supply end of the first driver chip U4 is connected to the second power supply end of the power module 1, the common end of the first driver chip U4 is connected to the second end of the twenty-fourth capacitor C24, the input high end of the first driver chip U4 is connected to the first end of the fortieth resistor R40, the input low end of the first driver chip U4 is connected to the first end of the forty-third resistor R43, the bootstrap high end of the first driver chip U4 is connected to the cathode of the third diode D3, the high end floating ground end of the first driver chip U4 is connected to the second end of the twenty-fifth capacitor C25, the output high end of the first driver chip U4 is connected to the second end of the tenth resistor R10, the output low end of the first driver chip U4 is connected to the sixteenth The second end of the resistor R16 is connected, the first end of the twenty-sixth capacitor C26 is connected to the second power supply end of the power supply module 1, the second end of the twenty-sixth capacitor C26 is grounded, the anode of the fourth diode D4 is connected to the second power supply end of the power supply module 1, the cathode of the fourth diode D4 is connected to the first end of the twenty-seventh capacitor C27, the power supply end of the second drive chip U5 is connected to the second power supply end of the power supply module 1, the common end of the second drive chip U5 is connected to the second end of the twenty-sixth capacitor C26, the input high end of the second drive chip U5 is connected to the first end of the forty-first resistor R41, the input low end of the second drive chip U5 is connected to the first end of the forty-fourth resistor R44, the bootstrap high end of the second drive chip U5 is connected to the fourth diode D4 The cathode is connected, the high-end floating ground terminal of the second driving chip U5 is connected to the second end of the twenty-seventh capacitor C27, the output high-end of the second driving chip U5 is connected to the second end of the twelfth resistor R12, the output low-end of the second driving chip U5 is connected to the second end of the eighteenth resistor R18, the first end of the twenty-eighth capacitor C28 is connected to the second power supply end of the power module 1, the second end of the twenty-eighth capacitor C28 is grounded, the anode of the fifth diode D5 is connected to the second power supply end of the power module 1, the cathode of the fifth diode D5 is connected to the first end of the twenty-ninth capacitor C29, the power supply end of the third driving chip U6 is connected to the second power supply end of the power module 1, the common end of the third driving chip U6 is connected to the second end of the twenty-eighth capacitor C28,The input high end of the third driver chip U6 is connected to the first end of the forty-second resistor R42, the input low end of the third driver chip U6 is connected to the first end of the forty-fifth resistor R45, the bootstrap high end of the third driver chip U6 is connected to the cathode of the fifth diode D5, the high end floating ground end of the third driver chip U6 is connected to the second end of the twenty-ninth capacitor C29, the output high end of the third driver chip U6 is connected to the second end of the fourteenth resistor R14, and the output low end of the third driver chip U6 is connected to the second end of the twentieth resistor R20.

[0091] Among them, the first output end of the control module 4 is connected to the second end of the 40th resistor R40, the second output end of the control module 4 is connected to the second end of the 43rd resistor R43, the third output end of the control module 4 is connected to the second end of the 41st resistor R41, the fourth output end of the control module 4 is connected to the second end of the 44th resistor R44, the fifth output end of the control module 4 is connected to the second end of the 42nd resistor R42, and the sixth output end of the control module 4 is connected to the second end of the 45th resistor R45.

[0092] It can be understood that, through the cooperation of the twenty-fourth capacitor C24, the third diode D3, the twenty-fifth capacitor C25, the fortieth resistor R40, the forty-third resistor R43, the twenty-sixth capacitor C26, the fourth diode D4, the twenty-seventh capacitor C27, the forty-first resistor R41, the forty-fourth resistor R44, the twenty-eighth capacitor C28, the fifth diode D5, the twenty-ninth capacitor C29, the forty-second resistor R42 and the forty-fifth resistor R45, the first driver chip U4, the second driver chip U5 and the third driver chip U6 can be controlled by the control module 4. The on / off of the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 are controlled under control, so as to cooperate with the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20, the twenty-first resistor R21 and the twenty-second resistor R22 to achieve stable driving of the motor.

[0093] It should be noted that the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 are all MOS tubes, namely, metal-oxide-semiconductor field-effect transistors (MOSFET). The specific types of the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 can be set according to actual needs and are not limited to this. For example, the models of the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 can all be HYG025N06LS1C2.

[0094] The tenth resistor R10, the twelfth resistor R12 and the fourteenth resistor R14 are driving resistors of the three-phase upper bridge arm, the sixteenth resistor R16, the eighteenth resistor R18 and the twentieth resistor R20 are driving resistors of the three-phase lower bridge arm, and the specific values ​​of the tenth resistor R10, the twelfth resistor R12, the fourteenth resistor R14, the sixteenth resistor R16, the eighteenth resistor R18 and the twentieth resistor R20 can be set according to actual needs and are not limited to this. For example, the values ​​of the tenth resistor R10, the twelfth resistor R12, the fourteenth resistor R14, the sixteenth resistor R16, the eighteenth resistor R18 and the twentieth resistor R20 can all be 47k.

[0095] The eleventh resistor R11, the thirteenth resistor R13, the fifteenth resistor R15, the seventeenth resistor R17, the nineteenth resistor R19 and the twenty-first resistor R21 are pull-down resistors of the driving signal to ensure the initial state of each MOS tube so that the driving end level of each MOS tube is a low level. The specific values ​​of the eleventh resistor R11, the thirteenth resistor R13, the fifteenth resistor R15, the seventeenth resistor R17, the nineteenth resistor R19 and the twenty-first resistor R21 can be set according to actual needs and are not limited to this. For example, the values ​​of the eleventh resistor R11, the thirteenth resistor R13, the fifteenth resistor R15, the seventeenth resistor R17, the nineteenth resistor R19 and the twenty-first resistor R21 can all be 10k.

[0096] The specific value of the twenty-second resistor R22 can be set according to actual needs, and there is no limitation to this. For example, the value of the twenty-second resistor R22 can be 2mR.

[0097] The twenty-fourth capacitor C24, the twenty-sixth capacitor C26 and the twenty-eighth capacitor C28 are used for voltage stabilization. The specific values ​​of the twenty-fourth capacitor C24, the twenty-sixth capacitor C26 and the twenty-eighth capacitor C28 can be set according to actual needs and are not limited to this. For example, the values ​​of the twenty-fourth capacitor C24, the twenty-sixth capacitor C26 and the twenty-eighth capacitor C28 can all be 100nF.

[0098] The third diode D3, the twenty-fifth capacitor C25, the fourth diode D4, the twenty-seventh capacitor C27, the fifth diode D5 and the twenty-ninth capacitor C29 form a bootstrap drive circuit for driving the MOS tube of the three-phase upper bridge arm. The specific types of the third diode D3, the fourth diode D4 and the fifth diode D5 can be set according to actual needs and are not limited to this. For example, the types of the third diode D3, the fourth diode D4 and the fifth diode D5 can be 1N4148; the specific values ​​of the twenty-fifth capacitor C25, the twenty-seventh capacitor C27 and the twenty-ninth capacitor C29 can be set according to actual needs and are not limited to this. For example, the values ​​of the twenty-fifth capacitor C25, the twenty-seventh capacitor C27 and the twenty-ninth capacitor C29 can all be 3.3μF.

[0099] The 40th resistor R40, the 43rd resistor R43, the 41st resistor R41, the 44th resistor R44, the 42nd resistor R42 and the 45th resistor R45 are used for current limiting of the PWM signal. The specific values ​​of the 40th resistor R40, the 43rd resistor R43, the 41st resistor R41, the 44th resistor R44, the 42nd resistor R42 and the 45th resistor R45 can be set according to actual needs and are not limited to this. For example, the values ​​of the 40th resistor R40, the 43rd resistor R43, the 41st resistor R41, the 44th resistor R44, the 42nd resistor R42 and the 45th resistor R45 can all be 47k.

[0100] The specific types of the first driver chip U4, the second driver chip U5 and the third driver chip U6 can be set according to actual needs, and there is no limitation on this. For example, the models of the first driver chip U4, the second driver chip U5 and the third driver chip U6 can all be EG2131. The EG2131 chip is a three-phase independent half-bridge driver chip, which integrates a logic signal input processing circuit, a dead zone control circuit, an undervoltage protection circuit, a locking circuit, a level shift circuit, a pulse filtering circuit and an output drive circuit. Specifically, the first driver chip U4, the second driver chip U5 and the third driver chip U6 all have a first pin (power supply terminal VCC), a second pin (input high end HIN), a third pin (input low end LIN), a fourth pin (common terminal COM), a fifth pin (output low end LO), a sixth pin (high end floating ground terminal VS), a seventh pin (output high end HO), an eighth pin (bootstrap high end VB), etc.

[0101] The control module 4 controls the switch unit through the pre-driving unit to achieve power output, and can realize the start and stop control, steering control, speed control, etc. of the motor.

[0102] like Figure 8 As shown, in some embodiments, the explosion-proof circuit further includes: a temperature acquisition module 7, the temperature acquisition module 7 includes: a twenty-third resistor R23, a thirtieth capacitor C30 and a thermistor RT, the first end of the twenty-third resistor R23 is connected to the fourth power supply end of the power module 1, the first end of the thirtieth capacitor C30 is connected to the second end of the twenty-third resistor R23, the second end of the thirtieth capacitor C30 is grounded, the thermistor RT is arranged on the switch unit, the first end of the thermistor RT is connected to the first end of the thirtieth capacitor C30, the second end of the thermistor RT is connected to the second end of the thirtieth capacitor C30, wherein the fourth input end of the control module 4 is connected to the first end of the thirtieth capacitor C30, and the control module 4 is used to turn off the motor when the temperature of the switch unit is greater than the preset temperature value.

[0103] It can be understood that since the thermistor RT is arranged on the switch unit, the temperature of the thermistor RT can change with the temperature of the switch unit, and when the temperature of the thermistor RT changes, its resistance also changes accordingly, thereby causing the signal at the first end of the thirtieth capacitor C30 to change. Therefore, the control module 4 can use the temperature acquisition module 7 to detect the temperature of the switch unit, and when the temperature of the switch unit is greater than the preset temperature value, the control module 4 uses the drive module 2 to turn off the motor, thereby realizing temperature protection of the motor and further improving the explosion-proof performance of the motor.

[0104] It should be noted that the twenty-third resistor R23 and the thermistor RT form a voltage divider network. The specific values ​​of the twenty-third resistor R23 and the thermistor RT can be set according to actual needs and are not limited to this. For example, the values ​​of the twenty-third resistor R23 and the thermistor RT can both be 10k.

[0105] The 30th capacitor C30 is used for filtering. The specific value of the 30th capacitor C30 can be set according to actual needs, and there is no limitation to this. For example, the value of the 30th capacitor C30 can be 100nF.

[0106] like Fig. 9 As shown, in some embodiments, the current acquisition module 3 includes: a twenty-fourth resistor R24, a thirty-first capacitor C31, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a thirty-second capacitor C32 and a second operational amplifier OP2, a first end of the twenty-fourth resistor R24 ​​is connected to the driving end of the driving module 2, a second end of the twenty-fourth resistor R24 ​​is connected to the in-phase input end of the second operational amplifier OP2, a first end of the thirty-first capacitor C31 is connected to the second end of the twenty-fourth resistor R24, a second end of the thirty-first capacitor C31 is grounded, a first end of the twenty-fifth resistor R25 is grounded, and The second end of the fifth resistor R25 is connected to the inverting input end of the second operational amplifier OP2, the positive power supply of the second operational amplifier OP2 is connected to the third power supply end of the power module 1, the negative power supply of the second operational amplifier OP2 is grounded, the first end of the twenty-sixth resistor R26 is connected to the second end of the twenty-fifth resistor R25, the second end of the twenty-sixth resistor R26 is connected to the output end of the second operational amplifier OP2, the first end of the twenty-seventh resistor R27 is connected to the output end of the second operational amplifier OP2, the second end of the twenty-seventh resistor R27 is connected to the first end of the thirty-second capacitor C32, and the second end of the thirty-second capacitor C32 is grounded. Among them, the fifth input end of the control module 4 is connected to the first end of the thirty-second capacitor C32.

[0107] It can be understood that the twenty-fifth resistor R25, the twenty-sixth resistor R26 and the second operational amplifier OP2 constitute an amplification circuit, which can amplify the current at the driving end of the driving module 2, so that the control module 4 can control the start and stop of the motor according to the amplified current value, thereby realizing current protection of the motor.

[0108] It should be noted that the twenty-fourth resistor R24 ​​and the thirty-first capacitor C31 are used for RC filtering. The specific values ​​of the twenty-fourth resistor R24 ​​and the thirty-first capacitor C31 can be set according to actual needs and are not limited to this. For example, the value of the twenty-fourth resistor R24 ​​can be 1k, and the value of the thirty-first capacitor C31 can be 100pf.

[0109] The twenty-seventh resistor R27 and the thirty-second capacitor C32 are used for RC filtering. The specific values ​​of the twenty-seventh resistor R27 and the thirty-second capacitor C32 can be set according to actual needs and are not limited to this. For example, the value of the twenty-seventh resistor R27 can be 1k, and the value of the thirty-second capacitor C32 can be 33nF.

[0110] The twenty-fifth resistor R25, the twenty-sixth resistor R26 and the second operational amplifier OP2 constitute an amplifying circuit. The specific values ​​of the twenty-fifth resistor R25 and the twenty-sixth resistor R26 can be set according to actual needs without limitation. For example, the value of the twenty-fifth resistor R25 can be 2k, and the value of the twenty-sixth resistor R26 can be 10k. The specific type of the second operational amplifier OP2 can be set according to actual needs without limitation. For example, the model of the second operational amplifier OP2 can be LM358DT.

[0111] Specifically, the first end of the twenty-fourth resistor R24 ​​is connected to the first end of the twenty-second resistor R22.

[0112] like Fig.10 As shown, in some embodiments, the explosion-proof circuit further includes: a back-EMF acquisition module 8, the back-EMF acquisition module 8 includes: a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-third capacitor C33, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-fourth capacitor C34, a thirty-second resistor R32, a thirty-third resistor R33 and a thirty-fifth capacitor C35, a first end of the twenty-eighth resistor R28 is connected to the U-phase coil of the motor, a second end of the twenty-eighth resistor R28 is connected to the first end of the twenty-ninth resistor R29, a second end of the twenty-ninth resistor R29 is grounded, a first end of the thirty-third capacitor C33 is connected to the first end of the twenty-ninth resistor R29, a second end of the thirty-third capacitor C33 is connected to the second end of the twenty-ninth resistor R29, A first end of the 30th resistor R30 is connected to the V-phase coil of the motor, a second end of the 30th resistor R30 is connected to a first end of the 31st resistor R31, a second end of the 31st resistor R31 is grounded, a first end of the 34th capacitor C34 is connected to a first end of the 31st resistor R31, a second end of the 34th capacitor C34 is connected to a second end of the 31st resistor R31, a first end of the 32nd resistor R32 is connected to the W-phase coil of the motor, a second end of the 32nd resistor R32 is connected to a first end of the 33rd resistor R33, a second end of the 33rd resistor R33 is grounded, a first end of the 35th capacitor C35 is connected to a first end of the 33rd resistor R33, a second end of the 35th capacitor C35 is connected to a second end of the 33rd resistor R33.

[0113] Among them, the sixth input terminal of the control module 4 is connected to the first end of the thirty-third capacitor C33, the sixth input terminal of the control module 4 is connected to the first end of the thirty-fourth capacitor C34, the seventh input terminal of the control module 4 is connected to the first end of the thirty-fifth capacitor C35, and the control module 4 is used to turn off the motor when the back electromotive force of the motor is greater than the preset potential.

[0114] It can be understood that the detection of the back electromotive force of the motor U phase coil is realized through the cooperation of the 28th resistor R28, the 29th resistor R29 and the 33rd capacitor C33, the detection of the back electromotive force of the motor V phase coil is realized through the cooperation of the 30th resistor R30, the 31st resistor R31 and the 34th capacitor C34, and the detection of the back electromotive force of the motor W phase coil is realized through the cooperation of the 32nd resistor R32, the 33rd resistor R33 and the 35th capacitor C35. Thus, the control module 4 can obtain the back electromotive force of the motor through the back electromotive force acquisition module 8, and when the back electromotive force of the motor is greater than the preset electromotive force, the drive module 2 is used to turn off the motor, thereby realizing the protection of the motor and improving the explosion-proof performance of the motor.

[0115] It should be noted that the control module 4 obtains the back electromotive force of the motor through the back electromotive force acquisition module 8, thereby being able to obtain the rotation speed of the motor, and further being able to implement rotation speed protection of the motor.

[0116] The specific values ​​of the twenty-eighth resistor R28, the twenty-ninth resistor R29, the thirtieth resistor R30, the thirty-first resistor R31, the thirty-second resistor R32 and the thirty-third resistor R33 can be set according to actual needs without limitation. For example, the values ​​of the twenty-eighth resistor R28, the thirtieth resistor R30 and the thirty-second resistor R32 can all be 47k, and the values ​​of the twenty-ninth resistor R29, the thirty-first resistor R31 and the thirty-third resistor R33 can all be 4.7k.

[0117] The specific values ​​of the thirty-third capacitor C33, the thirty-fourth capacitor C34 and the thirty-fifth capacitor C35 can be set according to actual needs, and there is no limitation to this. For example, the values ​​of the thirty-third capacitor C33, the thirty-fourth capacitor C34 and the thirty-fifth capacitor C35 can all be 1nF.

[0118] like Fig.11As shown, in some embodiments, the control module 4 includes: a thirty-sixth capacitor C36, a thirty-seventh capacitor C37, a thirty-eighth capacitor C38, a thirty-fourth resistor R34, a thirty-ninth capacitor C39, a sixth diode D6, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a fortieth capacitor C40, a thirty-seventh resistor R37, a forty-first capacitor C41, a thirty-eighth resistor R38, a forty-second capacitor C42, a forty-sixth resistor R46, a forty-seventh resistor R47, a light-emitting diode LED and a control chip U7, a first end of the thirty-sixth capacitor C36 is connected to the fourth power supply end of the power supply module 1, a second end of the thirty-sixth capacitor C36 is grounded, and a first end of the thirty-seventh capacitor C37 is connected to the thirty-sixth capacitor The first end of the thirty-seventh capacitor C37 is connected to the second end of the thirty-sixth capacitor C36, the first end of the thirty-eighth capacitor C38 is connected to the first end of the thirty-sixth capacitor C36, the second end of the thirty-eighth capacitor C38 is grounded, the first positive power supply electrode of the control chip U7 is connected to the first end of the thirty-eighth capacitor C38, the second positive power supply electrode of the control chip U7 is connected to the first end of the thirty-seventh capacitor C37, the first negative power supply electrode and the startup configuration end of the control chip U7 are respectively connected to the second end of the thirty-eighth capacitor C38, the first communication end of the control chip U7 is used to pass the commutation signal, the first end of the thirty-fourth resistor R34 is connected to the first communication end of the control chip U7, and the second end of the thirty-fourth resistor R34 is connected to the first communication end of the control chip U7. The first end of the thirty-fifth capacitor C40 is connected to the first end of the thirty-sixth capacitor C36, the second end of the thirty-sixth capacitor C40 is grounded, the cathode of the sixth diode D6 is used to pass the switching signal, the first end of the thirty-fifth resistor R35 is connected to the fourth power supply terminal of the power module 1, the second end of the thirty-fifth resistor R35 is connected to the anode of the sixth diode D6, the first end of the thirty-sixth resistor R36 is connected to the second end of the thirty-fifth resistor R35, the second end of the thirty-sixth resistor R36 is connected to the second communication terminal of the control chip U7, the first end of the fortieth capacitor C40 is connected to the second end of the thirty-sixth resistor R36, the second end of the fortieth capacitor C40 is grounded, the first end of the thirty-seventh resistor R37 is connected to the fourth power supply terminal of the power module 1, and the thirty-seventh resistor R The second end of the forty-first capacitor C41 is connected to the reset end of the control chip U7, the first end of the forty-first capacitor C41 is connected to the second end of the thirty-seventh resistor R37, the second end of the forty-first capacitor C41 is grounded, the first end of the thirty-eighth resistor R38 is connected to the speed signal, the second end of the thirty-eighth resistor R38 is connected to the third communication end of the control chip U7, the first end of the forty-second capacitor C42 is connected to the fourth power supply end of the power module 1, the second end of the forty-second capacitor C42 is grounded, the third power positive electrode of the control chip U7 is connected to the first end of the forty-second capacitor C42, the third power negative electrode of the control chip U7 is connected to the second end of the forty-second capacitor C42, the first debugging end and the second debugging end of the control chip U7 are used to pass the debugging signal,The first end of the forty-sixth resistor R46 is connected to the first debugging end of the control chip U7, the second end of the forty-sixth resistor R46 is grounded, the first end of the forty-seventh resistor R47 is connected to the fourth communication end of the control chip U7, the second end of the forty-seventh resistor R47 is connected to the anode of the light-emitting diode LED, the cathode of the light-emitting diode LED is grounded, and the fifth communication end of the control chip U7 is connected to the output end of the current acquisition module 3.

[0119] It can be understood that the control chip U7 controls the drive module 2 according to the commutation signal of the first communication end, the switch signal of the second communication end, the speed signal of the third communication end and the current signal of the fifth communication end to achieve control and protection of the motor, so that when the explosion-proof circuit is applied to power tools, it can meet the safety production needs of industries such as coal mines.

[0120] It should be noted that the thirty-sixth capacitor C36, the thirty-seventh capacitor C37, the thirty-eighth capacitor C38 and the forty-second capacitor C42 are used for filtering, and the specific values ​​of the thirty-sixth capacitor C36, the thirty-seventh capacitor C37, the thirty-eighth capacitor C38 and the forty-second capacitor C42 can be set according to actual needs without limitation. For example, the value of the thirty-sixth capacitor C36 can be 1μF, the value of the thirty-seventh capacitor C37 can be 100nF, the value of the thirty-eighth capacitor C38 can be 100nF, and the value of the forty-second capacitor C42 can be 100nF.

[0121] The thirty-fourth resistor R34 and the thirty-ninth capacitor C39 are used to control the input of the commutation signal of the chip U7. The specific values ​​of the thirty-fourth resistor R34 and the thirty-ninth capacitor C39 can be set according to actual needs and are not limited to this. For example, the value of the thirty-fourth resistor R34 can be 1k, and the value of the thirty-ninth capacitor C39 can be 100nF.

[0122] The sixth diode D6, the thirty-fifth resistor R35, the thirty-sixth resistor R36 and the fortieth capacitor C40 are used to control the input of the switching signal of the chip U7. The specific values ​​of the thirty-fifth resistor R35, the thirty-sixth resistor R36 and the fortieth capacitor C40 can be set according to actual needs without limitation. For example, the value of the thirty-fifth resistor R35 can be 10k, the value of the thirty-sixth resistor R36 can be 1k, and the value of the fortieth capacitor C40 can be 100nF; the specific type of the sixth diode D6 can be set according to actual needs without limitation. For example, the model of the sixth diode D6 can be 1N4148.

[0123] The thirty-seventh resistor R37 and the forty-first capacitor C41 constitute a reset circuit for controlling the reset of the chip U7. The specific values ​​of the thirty-seventh resistor R37 and the forty-first capacitor C41 can be set according to actual needs and are not limited to this. For example, the value of the thirty-seventh resistor R37 can be 10k, and the value of the forty-first capacitor C41 can be 100nF.

[0124] The thirty-eighth resistor R38 is used to control the input of the speed signal of the chip U7. The specific value of the thirty-eighth resistor R38 can be set according to actual needs and is not limited to this. For example, the value of the thirty-eighth resistor R38 can be 1k.

[0125] The forty-sixth resistor R46 is a pull-down resistor used to control the program burning of the chip U7. The specific value of the forty-sixth resistor R46 can be set according to actual needs and is not limited to this. For example, the value of the forty-sixth resistor R46 can be 10k.

[0126] The forty-seventh resistor R47 and the light-emitting diode LED are a light-emitting circuit, which are used to control the light indication of the chip U7. The specific value of the forty-seventh resistor R47 can be set according to actual needs and is not limited to this. For example, the value of the forty-seventh resistor R47 can be 2k; the specific type of the light-emitting diode LED can be set according to actual needs and is not limited to this.

[0127] The specific type of the control chip U7 can be set according to actual needs, and there is no restriction on this. For example, the model of the control chip U7 can be STM32F030K6T6. Specifically, the control chip U7 has a first pin (first power supply positive pole VDD), a second pin (communication terminal PF0-OSC_IN), a third pin (communication terminal PF0-OSC_OUT), a fourth pin (reset terminal NRST) and a fifth pin (second power supply positive pole VDDA). The control chip U7 also has a sixth pin to a thirteenth pin (communication terminals PA0-PA7) and an eighteenth pin to a twenty-fifth pin (communication terminals PA8-PA15). The control chip U7 also has a fourteenth pin (communication terminal PB0), a fifteenth pin (communication terminal PB1) and a twenty-sixth pin to a thirtieth pin (communication terminals PB3-PB7). The control chip U7 also has a sixteenth pin (third power supply negative pole VSS), a seventeenth pin (third power supply positive pole VDD), a thirty-first pin (startup configuration terminal BOOTS) and a thirty-second pin (first power supply negative pole VSS).

[0128] Among them, the second pin (communication terminal PF0-OSC_IN) is connected to the first end of the thirty-fourth resistor R34, the third pin (communication terminal PF0-OSC_OUT) is connected to the second end of the thirty-sixth resistor R36, the sixth pin (communication terminal PA0) is connected to the first end of the thirty-second capacitor C32, the seventh pin (communication terminal PA1) is connected to the second end of the ninth resistor R9, the eighth pin (communication terminal PA2) is connected to the second end of the thirty-eighth resistor R38, the ninth pin (communication terminal PA3) is connected to the first end of the thirtieth capacitor C30, the tenth pin (communication terminal PA4) is connected to the first end of the thirty-fifth capacitor C35, the eleventh pin (communication terminal PA5) is connected to the first end of the thirty-fourth capacitor C34, the twelfth pin (communication terminal PA6) is connected to the first end of the thirty-third capacitor C33, the thirteenth pin (communication terminal PA7) is connected to the second end of the forty-fifth resistor R45 The fourteenth pin (communication terminal PB0) is connected to the second end of the forty-fourth resistor R44, the fifteenth pin (communication terminal PB1) is connected to the second end of the forty-third resistor R43, the eighteenth pin (communication terminal PA8) is connected to the second end of the forty-second resistor R42, the nineteenth pin (communication terminal PA9) is connected to the second end of the forty-first resistor R41, the twentieth pin (communication terminal PA10) is connected to the second end of the fortieth resistor R40, the twenty-third pin (communication terminal PA13) is used as the second debugging terminal, the twenty-fourth pin (communication terminal PA14) is used as the first debugging terminal and is connected to the first end of the forty-sixth resistor R46, the twenty-fifth pin (communication terminal PA15) is used as a brake pin and is connected to the output end of the first operational amplifier OP1, which can directly act without the operation of the control chip U7, and the twenty-seventh pin (communication terminal PB4) is connected to the first end of the forty-seventh resistor R47.

[0129] Furthermore, the second pin (communication terminal PF0-OSC_IN), the third pin (communication terminal PF0-OSC_OUT) and the sixth pin (communication terminal PA0) can be connected to the external functional board through a safety barrier to achieve isolation protection.

[0130] The control chip U7 can also receive signals from gas sensors to detect gas concentrations using the gas sensors and control the start and stop of the motor according to the gas concentration, thereby further improving the explosion-proof performance of the motor.

[0131] The disclosed embodiment also provides a handheld electric tool, including: an explosion-proof circuit for coal mines as in the disclosed embodiment.

[0132] It can be understood that the control module 4 can use the current acquisition module 3 to obtain the current value of the motor, and when the current value of the motor is greater than the first preset current value, the control module 4 can use the drive module 2 to shut down the motor and restart the motor after a preset time, and when the number of motor restarts is greater than the preset number of times, the control module 4 can use the drive module 2 to shut down the motor, thereby realizing current protection of the motor, improving the explosion-proof performance of the handheld power tool, and thus meeting the safety production needs of industries such as coal mines.

[0133] It should be noted that the specific type of the handheld power tool can be set according to actual needs and is not limited to this. For example, the handheld power tool can be a handheld electric drill or the like.

[0134] In the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0135] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0136] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0137] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. An explosion-proof circuit for coal mines, characterized in that: include: Power module, drive module, current acquisition module and control module; Wherein, the first power supply end of the power module is connected to the power supply end of the motor, the driving end of the driving module is arranged between the power module and the motor, and the driving module is used to drive the motor; The input end of the current acquisition module is connected to the driving end of the driving module, and the current acquisition module is used to collect the current of the motor; The first input end of the control module is connected to the output end of the current acquisition module, and the output end of the control module is connected to the input end of the driving module. The control module is used to turn off the motor when the current value of the motor is greater than a first preset current value and restart the motor after a preset time, and turn off the motor when the number of restarts of the motor is greater than a preset number; Wherein, the power module includes: a power bus, a first conversion unit, a second conversion unit and a third conversion unit, the power bus is used to output a bus voltage, the power bus is connected to the power end of the motor, the driving end of the drive module is arranged between the power bus and the motor, the first conversion unit includes: a boost chip, a first capacitor, a second capacitor, a first diode, a third capacitor, a first resistor, a thirty-ninth resistor, an inductor, a second diode, a second resistor, a third resistor, a fourth capacitor and a fifth capacitor, the first end of the first capacitor is connected to the power bus, the second end of the first capacitor is grounded, the first end of the second capacitor is connected to the first end of the first capacitor, the second end of the second capacitor is connected to the first end of the first capacitor The first end of the inductor is connected to the second end of the boost chip, the anode of the first diode is connected to the first end of the second capacitor, the cathode of the first diode is connected to the input end of the boost chip, the first end of the third capacitor is connected to the cathode of the first diode, the second end of the third capacitor is connected to the second end of the second capacitor, the first end of the first resistor is grounded, the second end of the first resistor is connected to the enable end of the boost chip, the first end of the thirty-ninth resistor is connected to the second end of the first resistor, and the second end of the thirty-ninth resistor is used to pass the enable signal, so the first end of the inductor is connected to the input end of the boost chip, the second end of the inductor is connected to the output end of the boost chip, the anode of the second diode is connected to the boost chip The output end of the boost chip is connected, the first end of the fourth capacitor is grounded, the second end of the fourth capacitor is connected to the cathode of the second diode, the first end of the fifth capacitor is connected to the first end of the fourth capacitor, the second end of the fifth capacitor is connected to the second end of the fourth capacitor, the first end of the second resistor is connected to the feedback end of the boost chip, the second end of the second resistor is connected to the cathode of the second diode, the first end of the third resistor is grounded, the second end of the third resistor is connected to the first end of the second resistor, and the second conversion unit includes: a first step-down chip, a sixth capacitor, a seventh capacitor and an eighth capacitor, the first end of the sixth capacitor is connected to the first end of the third capacitor, the second end of the sixth capacitor ... grounded, the input end of the first buck chip is connected to the first end of the sixth capacitor, the first grounding end of the first buck chip is connected to the second end of the sixth capacitor, the first end of the seventh capacitor is connected to the output end of the first buck chip, the second end of the seventh capacitor is connected to the second grounding end of the first buck chip, the first end of the eighth capacitor is connected to the first end of the seventh capacitor, the second end of the eighth capacitor is connected to the second end of the seventh capacitor, and the second end of the eighth capacitor is grounded, the third conversion unit includes: a second buck chip, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor and a fourteenth capacitor, the first end of the ninth capacitor is connected to the first end of the eighth capacitor,The second end of the ninth capacitor is connected to the second end of the eighth capacitor, the first end of the tenth capacitor is connected to the first end of the ninth capacitor, the second end of the tenth capacitor is connected to the second end of the ninth capacitor, the input end and the flash memory end of the second buck chip are respectively connected to the first end of the tenth capacitor, the ground end of the second buck chip is connected to the second end of the tenth capacitor, the first end of the eleventh capacitor is connected to the output end of the second buck chip, the second end of the eleventh capacitor is connected to the ground end of the second buck chip, the first end of the twelfth capacitor is connected to the first end of the eleventh capacitor, the second end of the twelfth capacitor is connected to the second end of the eleventh capacitor, and the first end of the thirteenth capacitor is connected to the output end of the second buck chip. The first end of the first capacitor is connected to the first end of the twelfth capacitor, the second end of the thirteenth capacitor is connected to the second end of the twelfth capacitor, the first end of the fourteenth capacitor is connected to the first end of the thirteenth capacitor, and the second end of the fourteenth capacitor is connected to the second end of the thirteenth capacitor; wherein the power bus is used to output a first voltage, the second end of the fifth capacitor is used to output a second voltage, the power end of the driving module is connected to the second end of the fifth capacitor, the first end of the eighth capacitor is used to output a third voltage, the power end of the current acquisition module is connected to the first end of the eighth capacitor, the first end of the eleventh capacitor is used to output a fourth voltage, and the power end of the control module is connected to the first end of the eleventh capacitor; The explosion-proof circuit also includes: a short-circuit protection module, which includes: a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a fifth resistor, a sixth resistor, a twenty-first capacitor, a twenty-second capacitor and a first operational amplifier, wherein the first end of the fifteenth capacitor is connected to the power bus, the second end of the fifteenth capacitor is grounded, the first end of the sixteenth capacitor is connected to the first end of the fifteenth capacitor, the second end of the sixteenth capacitor is connected to the second end of the fifteenth capacitor, the first end of the seventeenth capacitor is connected to the first end of the sixteenth capacitor, the second end of the seventeenth capacitor is connected to the second end of the sixteenth capacitor, the first end of the eighteenth capacitor is connected to the first end of the seventeenth capacitor, the second end of the eighteenth capacitor is connected to the second end of the seventeenth capacitor, the first end of the nineteenth capacitor is connected to the first end of the eighteenth capacitor, the second end of the nineteenth capacitor is connected to the first end of the fourth resistor, the first end of the twentieth capacitor is connected to the first end of the nineteenth capacitor, and the The second end of the twentieth capacitor is connected to the second end of the nineteenth capacitor, the first end of the fifth resistor is connected to the first end of the eighth capacitor, the first end of the sixth resistor is connected to the second end of the fifth resistor, the first end of the twenty-first capacitor is connected to the second end of the fifth resistor, the second end of the twenty-first capacitor is connected to the second end of the sixth resistor, the second end of the twenty-first capacitor is grounded, the first end of the twenty-second capacitor is connected to the first end of the eighth capacitor, the second end of the twenty-second capacitor is grounded, the non-inverting input end of the first operational amplifier is connected to the first end of the twenty-first capacitor, the inverting input end of the first operational amplifier is connected to the second end of the fourth resistor, the positive power supply of the first operational amplifier is connected to the first end of the twenty-second capacitor, and the negative power supply of the first operational amplifier is connected to the second end of the twenty-first capacitor; wherein the second input end of the control module is connected to the output end of the first operational amplifier, and the control module is used to turn off the motor when the current value of the power bus is greater than the second preset current value; The explosion-proof circuit further includes: a voltage acquisition module, which includes: a seventh resistor, an eighth resistor, a twenty-third capacitor and a ninth resistor, wherein a first end of the seventh resistor is connected to the power bus, a first end of the eighth resistor is connected to a second end of the seventh resistor, a second end of the eighth resistor is grounded, a first end of the twenty-third capacitor is connected to a first end of the eighth resistor, a second end of the twenty-third capacitor is connected to a second end of the eighth resistor, and a first end of the ninth resistor is connected to a second end of the seventh resistor; wherein a third input end of the control module is connected to a second end of the ninth resistor, and the control module is used to turn off the motor when the voltage value of the power bus is not within a preset range; The current acquisition module includes: a twenty-fourth resistor, a thirty-first capacitor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a thirty-second capacitor, and a second operational amplifier, wherein the first end of the twenty-fourth resistor is connected to the driving end of the driving module, the second end of the twenty-fourth resistor is connected to the non-inverting input end of the second operational amplifier, the first end of the thirty-first capacitor is connected to the second end of the twenty-fourth resistor, the second end of the thirty-first capacitor is grounded, the first end of the twenty-fifth resistor is grounded, the second end of the twenty-fifth resistor is connected to the inverting input end of the second operational amplifier, the positive power supply of the second operational amplifier is connected to the third power supply end of the power supply module, the negative power supply of the second operational amplifier is grounded, the first end of the twenty-sixth resistor is connected to the second end of the twenty-fifth resistor, the second end of the twenty-sixth resistor is connected to the output end of the second operational amplifier, the first end of the twenty-seventh resistor is connected to the output end of the second operational amplifier, the second end of the twenty-seventh resistor is connected to the first end of the thirty-second capacitor, and the second end of the thirty-second capacitor is grounded; wherein the fifth input end of the control module is connected to the first end of the thirty-second capacitor; The explosion-proof circuit also includes: a back-EMF acquisition module, which includes: a twenty-eighth resistor, a twenty-ninth resistor, a thirty-third capacitor, a thirtieth resistor, a thirty-first resistor, a thirty-fourth capacitor, a thirty-second resistor, a thirty-third resistor and a thirty-fifth capacitor, wherein the first end of the twenty-eighth resistor is connected to the U-phase coil of the motor, the second end of the twenty-eighth resistor is connected to the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is grounded, the first end of the thirty-third capacitor is connected to the first end of the twenty-ninth resistor, the second end of the thirty-third capacitor is connected to the second end of the twenty-ninth resistor, the first end of the 30th resistor is connected to the V-phase coil of the motor, the second end of the 30th resistor is connected to the first end of the thirty-first resistor, the second end of the thirty-first resistor is grounded, and the thirty-fourth capacitor is connected to the first end of the thirty-third resistor. The first end of the control module is connected to the first end of the thirty-first resistor, the second end of the thirty-fourth capacitor is connected to the second end of the thirty-first resistor, the first end of the thirty-second resistor is connected to the W-phase coil of the motor, the second end of the thirty-second resistor is connected to the first end of the thirty-third resistor, the second end of the thirty-third resistor is grounded, the first end of the thirty-fifth capacitor is connected to the first end of the thirty-third resistor, and the second end of the thirty-fifth capacitor is connected to the second end of the thirty-third resistor; wherein the sixth input end of the control module is connected to the first end of the thirty-third capacitor, the sixth input end of the control module is connected to the first end of the thirty-fourth capacitor, the seventh input end of the control module is connected to the first end of the thirty-fifth capacitor, and the control module is used to turn off the motor when the back electromotive force of the motor is greater than the preset electromotive force; The control module includes: a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-fourth resistor, a thirty-ninth capacitor, a sixth diode, a thirty-fifth resistor, a thirty-sixth resistor, a fortieth capacitor, a thirty-seventh resistor, a forty-first capacitor, a thirty-eighth resistor, a forty-second capacitor, a forty-sixth resistor, a forty-seventh resistor, a light-emitting diode and a control chip, wherein a first end of the thirty-sixth capacitor is connected to a fourth power supply end of the power module, a second end of the thirty-sixth capacitor is grounded, a first end of the thirty-seventh capacitor is connected to a first end of the thirty-sixth capacitor, a second end of the thirty-seventh capacitor is connected to a second end of the thirty-sixth capacitor, and a first end of the thirty-eighth capacitor is connected to a first end of the thirty-sixth capacitor. The first power supply positive electrode of the control chip is connected to the first end of the thirty-eighth capacitor, the second power supply positive electrode of the control chip is connected to the first end of the thirty-seventh capacitor, the first power supply negative electrode and the startup configuration end of the control chip are respectively connected to the second end of the thirty-eighth capacitor, the first communication end of the control chip is used to pass the commutation signal, the first end of the thirty-fourth resistor is connected to the first communication end of the control chip, the second end of the thirty-fourth resistor is connected to the first end of the thirty-ninth capacitor, the second end of the thirty-ninth capacitor is grounded, the cathode of the sixth diode is used to pass the switch signal, the first end of the thirty-fifth resistor is connected to the fourth power supply of the power module The first end of the thirty-sixth resistor is connected to the second end of the thirty-fifth resistor, the second end of the thirty-sixth resistor is connected to the second communication end of the control chip, the first end of the fortieth capacitor is connected to the second end of the thirty-sixth resistor, the second end of the fortieth capacitor is grounded, the first end of the thirty-seventh resistor is connected to the fourth power supply end of the power module, the second end of the thirty-seventh resistor is connected to the reset end of the control chip, the first end of the forty-first capacitor is connected to the second end of the thirty-seventh resistor, the second end of the forty-first capacitor is grounded, the first end of the thirty-eighth resistor is connected to the second end of the thirty-seventh resistor, the second end of the forty-first capacitor is grounded, the speed signal is input to the first end of the thirty-eighth resistor, and the thirty-seventh resistor is connected to the reset end of the control chip. The second end of the eight resistors is connected to the third communication end of the control chip, the first end of the forty-second capacitor is connected to the fourth power supply end of the power module, the second end of the forty-second capacitor is grounded, the third power positive electrode of the control chip is connected to the first end of the forty-second capacitor, the third power negative electrode of the control chip is connected to the second end of the forty-second capacitor, the first debugging end and the second debugging end of the control chip are used to pass debugging signals, the first end of the forty-sixth resistor is connected to the first debugging end of the control chip, the second end of the forty-sixth resistor is grounded, the first end of the forty-seventh resistor is connected to the fourth communication end of the control chip, and the second end of the forty-seventh resistor is connected to the anode of the light-emitting diode.The cathode of the light emitting diode is grounded, and the fifth communication terminal of the control chip is connected to the output terminal of the current acquisition module; The control chip receives a signal from the gas sensor to detect the gas concentration using the gas sensor and control the start and stop of the motor according to the gas concentration.

2. The explosion-proof circuit for coal mine according to claim 1, characterized in that: The driving module comprises: A switch unit, the switch unit comprising: a first MOS tube, a tenth resistor, an eleventh resistor, a second MOS tube, a twelfth resistor, a thirteenth resistor, a third MOS tube, a fourteenth resistor, a fifteenth resistor, a fourth MOS tube, a sixteenth resistor, a seventeenth resistor, a fifth MOS tube, an eighteenth resistor, a nineteenth resistor, a sixth MOS tube, a twentieth resistor, a twenty-first resistor and a twenty-second resistor, the drain of the first MOS tube being connected to the first power supply end of the power module, the source of the first MOS tube being connected to the U-phase coil of the motor, the gate of the first MOS tube being connected to the first end of the tenth resistor, the first end of the eleventh resistor being connected to the first end of the tenth resistor, and the The second end of the eleventh resistor is connected to the source of the first MOS tube, the drain of the second MOS tube is connected to the first power supply end of the power module, the source of the second MOS tube is connected to the V-phase coil of the motor, the gate of the second MOS tube is connected to the first end of the twelfth resistor, the first end of the thirteenth resistor is connected to the first end of the twelfth resistor, the second end of the thirteenth resistor is connected to the source of the second MOS tube, the drain of the third MOS tube is connected to the first power supply end of the power module, the source of the third MOS tube is connected to the W-phase coil of the motor, the gate of the third MOS tube is connected to the first end of the fourteenth resistor, and the first end of the fifteenth resistor is connected to the second end of the twelfth resistor. one end of the MOS tube is connected to the first end of the fourteenth resistor, the second end of the fifteenth resistor is connected to the source of the third MOS tube, the drain of the fourth MOS tube is connected to the U-phase coil of the motor, the source of the fourth MOS tube is connected to the first end of the twenty-second resistor, the gate of the fourth MOS tube is connected to the first end of the sixteenth resistor, the first end of the seventeenth resistor is connected to the first end of the sixteenth resistor, the second end of the seventeenth resistor is connected to the first end of the twenty-second resistor, the drain of the fifth MOS tube is connected to the V-phase coil of the motor, the source of the fifth MOS tube is connected to the first end of the twenty-second resistor, the gate of the fifth MOS tube is connected to the first end of the sixteenth resistor, the first end of the seventeenth resistor is connected to the first end of the twenty-second resistor, The first end of the eighteenth resistor is connected to the first end of the eighteenth resistor, the first end of the nineteenth resistor is connected to the first end of the eighteenth resistor, the second end of the nineteenth resistor is connected to the first end of the twenty-second resistor, the drain of the sixth MOS tube is connected to the W-phase coil of the motor, the source of the sixth MOS tube is connected to the first end of the twenty-second resistor, the gate of the sixth MOS tube is connected to the first end of the twentieth resistor, the first end of the twenty-first resistor is connected to the first end of the twentieth resistor, the second end of the twenty-first resistor is connected to the first end of the twenty-second resistor, the second end of the twenty-second resistor is grounded, and the first end of the twenty-second resistor is connected to the input end of the current acquisition module; A pre-driving unit, the pre-driving unit comprising: a first driving chip, a twenty-fourth capacitor, a third diode, a twenty-fifth capacitor, a fortieth resistor, a forty-third resistor, a second driving chip, a twenty-sixth capacitor, a fourth diode, a twenty-seventh capacitor, a forty-first resistor, a forty-fourth resistor, a third driving chip, a twenty-eighth capacitor, a fifth diode, a twenty-ninth capacitor, a forty-second resistor and a forty-fifth resistor, wherein the first end of the twenty-fourth capacitor is connected to the second power supply end of the power module, the second end of the twenty-fourth capacitor is grounded, the anode of the third diode is connected to the second power supply end of the power module, the cathode of the third diode is connected to the first end of the twenty-fifth capacitor, the power supply end of the first driving chip is connected to the The first driving chip is connected to the second power supply end of the power supply module, the common end of the first driving chip is connected to the second end of the twenty-fourth capacitor, the input high end of the first driving chip is connected to the first end of the fortieth resistor, the input low end of the first driving chip is connected to the first end of the forty-third resistor, the bootstrap high end of the first driving chip is connected to the cathode of the third diode, the high end floating ground end of the first driving chip is connected to the second end of the twenty-fifth capacitor, the output high end of the first driving chip is connected to the second end of the tenth resistor, the output low end of the first driving chip is connected to the second end of the sixteenth resistor, the first end of the twenty-sixth capacitor is connected to the second power supply end of the power supply module, and the twenty-sixth capacitor The second end of the fourth diode is connected to ground, the anode of the fourth diode is connected to the second power supply end of the power module, the cathode of the fourth diode is connected to the first end of the twenty-seventh capacitor, the power supply end of the second driver chip is connected to the second power supply end of the power module, the common end of the second driver chip is connected to the second end of the twenty-sixth capacitor, the input high end of the second driver chip is connected to the first end of the forty-first resistor, the input low end of the second driver chip is connected to the first end of the forty-fourth resistor, the bootstrap high end of the second driver chip is connected to the cathode of the fourth diode, the high end floating ground end of the second driver chip is connected to the second end of the twenty-seventh capacitor, the output high end of the second driver chip is connected to the first end of the forty-first resistor, and the output low end of the second driver chip is connected to the first end of the forty-fourth resistor. The second end of the twelfth resistor is connected, the output low end of the second driving chip is connected to the second end of the eighteenth resistor, the first end of the twenty-eighth capacitor is connected to the second power supply end of the power module, the second end of the twenty-eighth capacitor is grounded, the anode of the fifth diode is connected to the second power supply end of the power module, the cathode of the fifth diode is connected to the first end of the twenty-ninth capacitor, the power supply end of the third driving chip is connected to the second power supply end of the power module, the common end of the third driving chip is connected to the second end of the twenty-eighth capacitor, the input high end of the third driving chip is connected to the first end of the forty-second resistor, and the input low end of the third driving chip is connected to the first end of the forty-fifth resistor.The bootstrap high end of the third driver chip is connected to the cathode of the fifth diode, the high end floating ground end of the third driver chip is connected to the second end of the 29th capacitor, the output high end of the third driver chip is connected to the second end of the 14th resistor, and the output low end of the third driver chip is connected to the second end of the 20th resistor; Among them, the first output end of the control module is connected to the second end of the 40th resistor, the second output end of the control module is connected to the second end of the 43rd resistor, the third output end of the control module is connected to the second end of the 41st resistor, the fourth output end of the control module is connected to the second end of the 44th resistor, the fifth output end of the control module is connected to the second end of the 42nd resistor, and the sixth output end of the control module is connected to the second end of the 45th resistor.

3. The explosion-proof circuit for coal mine according to claim 2, characterized in that: The explosion-proof circuit also includes: A temperature acquisition module, the temperature acquisition module comprising: a twenty-third resistor, a thirtieth capacitor and a thermistor, wherein a first end of the twenty-third resistor is connected to a fourth power supply end of the power module, a first end of the thirtieth capacitor is connected to a second end of the twenty-third resistor, a second end of the thirtieth capacitor is grounded, and the thermistor is arranged on the switch unit, a first end of the thermistor is connected to a first end of the thirtieth capacitor, and a second end of the thermistor is connected to a second end of the thirtieth capacitor; The fourth input terminal of the control module is connected to the first terminal of the thirtieth capacitor, and the control module is used to turn off the motor when the temperature of the switch unit is greater than a preset temperature value.

4. A handheld electric tool, characterized in that: include: An explosion-proof circuit for coal mines as described in any one of claims 1 to 3.

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