Motor driving protection circuit

Abstract

An embodiment of the utility model provides a motor driving protection circuit, which relates to the technical field of motor driving protection and comprises an acquisition module, a comparison module and a driving module, the acquisition module acquires first voltage of a first power supply and sends the first voltage to the comparison module, and the comparison module sends the first voltage to the driving module when the first voltage is larger than a first threshold value. When the first voltage is smaller than a first threshold value and the first voltage is smaller than a second threshold value, a first signal is sent to the driving module, then the driving module controls the first power supply to supply power to the motor under the condition that the first signal is acquired, and the comparison module controls the second power supply to supply power to the motor under the condition that the first voltage is smaller than the first threshold value or larger than the second threshold value. The first signal is sent to the driving module, and then the motor is powered off under the condition that the second signal is obtained through the driving module, so that motor driving abnormity caused by overvoltage and undervoltage of the first power supply is avoided, and the risk of motor burst is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor drive protection technical field especially, it relates to a motor drive protection circuit. BACKGROUND

[0002] The motor is widely used in industry, household appliance, car, medical equipment and many fields, along with the development of industrial technology, the power of motor is higher and higher, in order to guarantee the safe use of motor, need motor can long-term reliable and stable work.

[0003] However, the voltage anomaly of power supply causes motor anomaly, thereby leading to motor burst.

[0004] It needs to be explained that motor burst refers to the motor speed or position exceeds the predetermined target value, leading to damage to the motor. UTILITY MODEL CONTENTS

[0005] The utility model provides a motor drive protection circuit to at least solve the problem of motor burst caused by the voltage anomaly of power supply in prior art.

[0006] The utility model embodiment provides a motor drive protection circuit, comprising: acquisition module, comparison module and drive module;

[0007] The acquisition module is electrically connected with the comparison module, and the acquisition module is used for being electrically connected with the first power supply, acquiring the first voltage of the first power supply and sending to the comparison module;

[0008] The comparison module is electrically connected with the drive module, and the comparison module is used for sending the first signal to the drive module in the case that the first voltage is greater than the first threshold value and the first voltage is less than the second threshold value;And in the case that the first voltage is less than the first threshold value or the first voltage is greater than the second threshold value, the second signal is sent to the drive module;

[0009] The drive module is used for being electrically connected with the first power supply and the motor respectively, in the case that the first signal is acquired, the first power supply is used to power the motor;And in the case that the second signal is acquired, the motor is powered off.

[0010] Optionally, the comparison module comprises a first comparison submodule and a second comparison submodule; the first comparison submodule is electrically connected with the acquisition module and the driving module respectively, and is configured to send a first level signal to the driving module when the first voltage is greater than the first threshold value, and send a second level signal to the driving module when the first voltage is less than the first threshold value; the second comparison submodule is electrically connected with the acquisition module and the driving module respectively, and is configured to send a first level signal to the driving module when the first voltage is less than the second threshold value, and send a second level signal to the driving module when the first voltage is greater than the second threshold value; wherein the first signal is used to represent that the first comparison submodule sends the first level signal and the second comparison submodule sends the first level signal; the second signal is used to represent that the first comparison submodule sends the second level signal or the second comparison submodule sends the second level signal.

[0011] Optionally, the first comparison submodule comprises a first operational amplifier, a first resistor, a second resistor and a third resistor; a first end of the first resistor is configured to be electrically connected with a second power supply, and a second end of the first resistor is electrically connected with a non-inverting input terminal of the first operational amplifier; a first end of the second resistor is electrically connected with an output terminal of the acquisition module, and a second end of the second resistor is electrically connected with an inverting input terminal of the first operational amplifier; an output terminal of the first operational amplifier is electrically connected with a first input terminal of the driving module; a first end of the third resistor is configured to be electrically connected with a third power supply, and a second end of the third resistor is electrically connected with the first input terminal of the driving module.

[0012] Optionally, the second comparison submodule comprises a second operational amplifier, a fourth resistor, a fifth resistor and a sixth resistor; a first end of the fourth resistor is configured to be electrically connected with the second power supply, and a second end of the fourth resistor is electrically connected with an inverting input terminal of the second operational amplifier; a first end of the fifth resistor is electrically connected with the output terminal of the acquisition module, and a second end of the fifth resistor is electrically connected with a non-inverting input terminal of the second operational amplifier; an output terminal of the second operational amplifier is electrically connected with the first input terminal of the driving module; a first end of the sixth resistor is configured to be electrically connected with the third power supply, and a second end of the sixth resistor is electrically connected with the first input terminal of the driving module.

[0013] Optionally, the acquisition module comprises a seventh resistor and an eighth resistor; a first end of the seventh resistor is configured to be electrically connected with the first power supply, and a second end of the seventh resistor is electrically connected with a first end of the eighth resistor and an input terminal of the comparison module respectively; a second end of the eighth resistor is grounded.

[0014] Optionally, the motor drive protection circuit further comprises a ninth resistor and a first capacitor; a first end of the ninth resistor is electrically connected with a first end of the first capacitor, a second end of the ninth resistor is configured to be electrically connected with the first power supply; a second end of the first capacitor is grounded; an input end of the acquisition module is electrically connected with the first end of the first capacitor, and the acquisition module is further configured to acquire a second voltage of the first capacitor and send the second voltage to the drive module; a second input end of the drive module is electrically connected with the second end of the ninth resistor, and the drive module is specifically configured to supply power to the motor by the first power supply in the case that the first signal is acquired and the second voltage is a preset voltage value.

[0015] Optionally, the motor drive protection circuit further comprises a relay and a control module; the drive module is electrically connected with the control module, and the drive module is further configured to send a third signal to the control module in the case that the second voltage is equal to a preset voltage value, and send a fourth signal to the control module in the case that the second voltage is less than the preset voltage value; the control module is electrically connected with the relay, and the control module is configured to be electrically connected with the first power supply, control the relay to be closed in the case that the third signal is acquired, and control the relay to be opened in the case that the fourth signal is acquired; a common end of the relay is configured to be electrically connected with the first power supply, and a normally open end of the relay is electrically connected with the second input end of the drive module.

[0016] Optionally, the control module comprises a first switching device, a second switching device, a first diode, a second diode, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; a first end of the tenth resistor is configured to be electrically connected with the first power supply, and a second end of the tenth resistor is electrically connected with a first end of the first switching device; a first end of the eleventh resistor is electrically connected with a second end of the tenth resistor, and a second end of the eleventh resistor is electrically connected with a first end of the twelfth resistor; a second end of the first switching device is electrically connected with a positive electrode of the relay, and a control end of the first switching device is electrically connected with the first end of the twelfth resistor; a negative electrode of the first diode is electrically connected with the positive electrode of the relay, and a positive electrode of the first diode is electrically connected with a negative electrode of the relay; a second end of the twelfth resistor is electrically connected with a first end of the second switching device; a positive electrode of the second diode is electrically connected with a control output end of the drive module, and a negative electrode of the second diode is electrically connected with a first end of the thirteenth resistor; a second end of the thirteenth resistor is electrically connected with a control end of the second switching device; a first end of the fourteenth resistor is electrically connected with the second end of the thirteenth resistor, and a second end of the fourteenth resistor is grounded; a second end of the second switching device is grounded; and a negative electrode of the relay is grounded.

[0017] Optionally, the control module comprises a third switch device, a third diode, a fourth diode, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor; the first end of the fifteenth resistor is configured to be electrically connected with the first power supply, and the second end of the fifteenth resistor is electrically connected with the positive electrode of the relay; the negative electrode of the third diode is electrically connected with the positive electrode of the relay, and the positive electrode of the third diode is electrically connected with the negative electrode of the relay; the positive electrode of the fourth diode is electrically connected with the control output end of the driving module, and the negative electrode of the fourth diode is electrically connected with the first end of the sixteenth resistor; the second end of the sixteenth resistor is electrically connected with the control end of the third switch device; the first end of the third switch device is electrically connected with the negative electrode of the relay, and the second end of the third switch device is grounded; the first end of the seventeenth resistor is electrically connected with the second end of the sixteenth resistor, and the second end of the seventeenth resistor is grounded.

[0018] Optionally, the acquisition module comprises a seventh resistor, an eighth resistor, an eighteenth resistor, a nineteenth resistor; the first end of the seventh resistor is configured to be electrically connected with the first power supply, and the second end of the seventh resistor is electrically connected with the first end of the eighth resistor and the input end of the comparison module respectively; the second end of the eighth resistor is grounded; the first end of the eighteenth resistor is electrically connected with the first end of the first capacitor, and the second end of the eighteenth resistor is electrically connected with the first end of the nineteenth resistor and the third input end of the driving module respectively; the second end of the nineteenth resistor is grounded.

[0019] Optionally, the driving module comprises a micro control unit and a driving submodule; the micro control unit is electrically connected with the comparison module and the driving submodule respectively, and the micro control unit is configured to send a fifth signal to the driving submodule when the first signal is acquired, and send a sixth signal to the driving submodule when the second signal is acquired; the driving submodule is configured to be electrically connected with the first power supply and the motor respectively, supply power to the motor through the first power supply when the fifth signal is acquired, and cut off the power supply of the motor when the sixth signal is acquired.

[0020] Optionally, the driving sub-module comprises a plurality of driving units, the motor comprises a plurality of phase input terminals, and the driving units correspond to the phase input terminals one by one; each driving unit comprises a driving chip, a fourth switching device, a fifth switching device, a twentieth resistor, a twenty-first resistor, a twenty-second resistor and a twenty-third resistor; in the driving unit: a first input terminal of the driving chip is electrically connected to a first output terminal of the micro control unit, a second input terminal of the driving chip is electrically connected to a second output terminal of the micro control unit, a first output terminal of the driving chip is electrically connected to a first terminal of the twentieth resistor, a second output terminal of the driving chip is electrically connected to a first terminal of the twenty-second resistor, and a third output terminal of the driving chip is used to be electrically connected to the phase input terminal corresponding to the driving unit; a second terminal of the twentieth resistor is electrically connected to a control terminal of the fourth switching device; a first terminal of the twenty-first resistor is electrically connected to the control terminal of the fourth switching device, and a second terminal of the twenty-first resistor is electrically connected to a second terminal of the fourth switching device; a first terminal of the fourth switching device is used to be electrically connected to the first power supply, and a second terminal of the fourth switching device is used to be electrically connected to the phase input terminal corresponding to the driving unit; a second terminal of the twenty-second resistor is electrically connected to a control terminal of the fifth switching device; a first terminal of the twenty-third resistor is electrically connected to the control terminal of the fifth switching device, and a second terminal of the twenty-third resistor is electrically connected to a second terminal of the fifth switching device; a first terminal of the fifth switching device is used to be electrically connected to the phase input terminal corresponding to the driving unit, and a second terminal of the fifth switching device is grounded.

[0021] Optionally, the motor driving protection circuit comprises a twenty-fourth resistor and a current detection module; a first terminal of the twenty-fourth resistor is electrically connected to a second terminal of the fifth switching device, and a second terminal of the twenty-fourth resistor is grounded; an input terminal of the current detection module is electrically connected to the first terminal of the twenty-fourth resistor, an output terminal of the current detection module is electrically connected to a first input terminal of the micro control unit, and the current detection module is used to determine that the current of the fifth switching device is abnormal and send a seventh signal to the micro control unit when a voltage of the twenty-fourth resistor is greater than a third threshold value; and the micro control unit is further used to power off the motor when the seventh signal is acquired.

[0022] Optionally, the current detection module comprises a third operational amplifier, a twenty-fifth resistor, a twenty-sixth resistor and a fifth diode; a first end of the twenty-fifth resistor is electrically connected with the fourth power supply, and a second end of the twenty-fifth resistor is electrically connected with a non-inverting input terminal of the third operational amplifier; a first end of the twenty-sixth resistor is electrically connected with the first end of the twenty-fourth resistor, and a second end of the twenty-sixth resistor is electrically connected with an inverting input terminal of the third operational amplifier; an output terminal of the third operational amplifier is electrically connected with a positive electrode of the fifth diode; and a negative electrode of the fifth diode is electrically connected with the first input terminal of the micro control unit.

[0023] In the embodiment of the present application, the first voltage of the first power supply is collected by the collection module and sent to the comparison module, and the comparison module sends a first signal to the driving module when the first voltage is greater than the first threshold value and the first voltage is less than the second threshold value, then the driving module controls the first power supply to supply power to the motor when the first signal is acquired, and the comparison module sends a second signal to the driving module when the first voltage is less than the first threshold value or the first voltage is greater than the second threshold value, then the driving module powers off the motor when the second signal is acquired, so as to avoid the voltage overvoltage and undervoltage of the power supply causing the motor drive abnormality, and reduce the risk of motor explosion. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiment of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiment of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0025] Figure 1 is a structural schematic diagram of a motor drive protection circuit provided by the embodiment of the present application;

[0026] Figure 2 is a structural schematic diagram of another motor drive protection circuit provided by the embodiment of the present application;

[0027] Figure 3 is a specific structural schematic diagram of the motor drive protection circuit provided by the embodiment of the present application;

[0028] Figure 4 is another specific structural schematic diagram of the motor drive protection circuit provided by the embodiment of the present application;

[0029] Figure 5 is a structural schematic diagram of a driving sub-module provided by the embodiment of the present application;

[0030] Figure 6 is a specific structure schematic diagram of the driving unit provided by the embodiment of the utility model.

[0031] Reference signs:

[0032] 10 - comparison module; 11 - first comparison submodule; 12 - second comparison submodule; 20 - acquisition module; 30 - drive module; 31 - micro control unit; 32 - drive submodule; 321 - drive unit; 40 - first power supply; 50 - motor; 60 - control module; 70 - current detection module. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the utility model is further explained in detail below by combining with the drawings and specific embodiments.

[0034] With reference to Figure 1 , the utility model embodiment provides a motor drive protection circuit, include: acquisition module 20, comparison module 10 and drive module 30, acquisition module 20 with comparison module 10 electricity is connected, acquisition module 20 is used for with first power supply 40 electricity is connected, and the first voltage of first power supply 40 is collected and is sent to comparison module 10, comparison module 10 with drive module 30 electricity is connected, comparison module 10 is used to in the first voltage greater than first threshold value, and the first voltage is less than second threshold value, under the condition, first signal is sent to drive module 30, and in the first voltage is less than the first threshold value, or the first voltage is greater than the second threshold value, second signal is sent to drive module 30, drive module 30 is used to respectively with first power supply 40, motor 50 electricity is connected, in the condition of obtaining the first signal, through first power supply 40 for motor 50 power supply, and in the condition of obtaining the second signal, motor 50 is powered off.

[0035] It needs to be explained that, in the condition of first voltage greater than first threshold value, it is explained that first power supply 40 overvoltage anomaly, in the condition of first voltage less than second threshold value, it is explained that first power supply 40 under-voltage anomaly, drive module 30 in the condition of obtaining first signal, it is explained that the voltage of first power supply 40 is normal, and drive module 30 controls first power supply 40 for motor 50 power supply, and drive motor 50 works, drive module 30 in the condition of obtaining second signal, it is explained that the voltage of first power supply 40 overvoltage or under-voltage anomaly, and drive module 30 controls motor 50 power off, and motor 50 does not work.

[0036] Specifically, first power supply 40 can be a direct current power supply, for example battery.

[0037] In the embodiment of the utility model, through the acquisition module 20 gathers the first voltage of first power supply 40 and sends to comparison module 10, again through comparison module 10 in the case where first voltage is greater than first threshold value, and first voltage is less than second threshold value, first signal is sent to drive module 30, then through drive module 30 in the case where first signal is obtained, control first power supply 40 is motor 50 power supply, and through comparison module 10 in the case where first voltage is less than first threshold value, or first voltage is greater than second threshold value, second signal is sent to drive module 30, then through drive module 30 in the case where second signal is obtained, motor 50 is powered off, to avoid the voltage of first power supply overvoltage, under voltage causes motor 50 abnormal, has reduced the risk of motor 50 explosion.

[0038] Optionally, referring to Figure 3 In some embodiments, the comparison module 10 includes a first comparison submodule 11 and a second comparison submodule 12. The first comparison submodule 11 is electrically connected to the acquisition module 20 and the drive module 30. The first comparison submodule 11 is configured to send a first level signal to the drive module 30 when the first voltage is greater than the first threshold value, and to send a second level signal to the drive module 30 when the first voltage is less than the first threshold value. The second comparison submodule 12 is electrically connected to the acquisition module 20 and the drive module 30. The second comparison submodule 12 is configured to send a first level signal to the drive module 30 when the first voltage is less than the second threshold value, and to send a second level signal to the drive module 30 when the first voltage is greater than the second threshold value. The first signal is used to indicate that the first comparison submodule 11 sends the first level signal and the second comparison submodule 12 sends the first level signal. The second signal is used to indicate that the first comparison submodule 11 sends the second level signal or the second comparison submodule 12 sends the second level signal.

[0039] It should be noted that the first level is opposite to the second level, for example, the first level is a low level and the second level is a high level. The first comparison submodule 11 is configured to detect whether the first power supply 40 is overvoltage. The second comparison submodule 12 is configured to detect whether the first power supply 40 is under voltage.

[0040] In the embodiment of the utility model, in the case that the first comparison submodule 11 sends the signal of the first level and the second comparison submodule 12 sends the signal of the first level, it is explained that the driving module 30 obtains the first signal, the driving module 30 controls the first power supply 40 to supply power for the motor 50, and the motor 50 works; in the case that the first comparison submodule 11 sends the signal of the second level or the second comparison submodule 12 sends the signal of the second level, it is explained that the driving module 30 obtains the second signal, the driving module 30 controls the motor 50 to be powered off, and the motor 50 does not work.

[0041] Optionally, in some embodiments, the first comparison submodule 11 comprises a first operational amplifier U1, a first resistor R1, a second resistor R2 and a third resistor R3; a first end of the first resistor R1 is used for being electrically connected with a second power supply, a second end of the first resistor R1 is electrically connected with a non-inverting input terminal of the first operational amplifier U1; a first end of the second resistor R2 is electrically connected with an output terminal of the acquisition module 20, a second end of the second resistor R2 is electrically connected with an inverting input terminal of the first operational amplifier U1; an output terminal of the first operational amplifier U1 is electrically connected with a first input terminal of the driving module 30; a first end of the third resistor R3 is used for being electrically connected with a third power supply, and a second end of the third resistor R3 is electrically connected with the first input terminal of the driving module 30.

[0042] It should be noted that the first resistor R1 is an input resistor of the non-inverting input terminal of the first operational amplifier U1, the second resistor R2 is an input resistor of the inverting input terminal of the first operational amplifier U1, and the third resistor R3 is a pull-up resistor; the voltage of the second power supply is a second threshold value.

[0043] In the embodiment of the utility model, the first voltage of the first power supply 40 collected by the acquisition module 20 is compared with the voltage of the second power supply through the first operational amplifier U1, in the case that the first voltage is greater than the voltage of the second power supply, the output terminal of the first operational amplifier U1 outputs the signal of the low level, so that the first comparison submodule 11 outputs the signal of the low level; in the case that the first voltage is less than the voltage of the second power supply, the output terminal of the first operational amplifier U1 outputs the signal of the high level, so that the first comparison submodule 11 outputs the signal of the high level.

[0044] Optionally, in some embodiments, the second comparison submodule 12 comprises a second operational amplifier U2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6; the first end of the fourth resistor R4 is used for being electrically connected with the second power supply, the second end of the fourth resistor R4 is electrically connected with the inverting input terminal of the second operational amplifier U2; the first end of the fifth resistor R5 is electrically connected with the output end of the acquisition module 20, the second end of the fifth resistor R5 is electrically connected with the non-inverting input terminal of the second operational amplifier U2; the output end of the second operational amplifier U2 is electrically connected with the first input end of the driving module 30; the first end of the sixth resistor R6 is used for being electrically connected with the third power supply, the second end of the sixth resistor R6 is electrically connected with the first input end of the driving module 30.

[0045] It should be noted that the fourth resistor R4 is the input resistance of the inverting input terminal of the second operational amplifier U2, the fifth resistor R5 is the input resistance of the non-inverting input terminal of the second operational amplifier U2, and the sixth resistor R6 is a pull-up resistor; the voltage of the third power supply is the first threshold value.

[0046] In the embodiment of the utility model, the first voltage of the first power supply 40 collected by the acquisition module 20 is compared with the voltage of the third power supply through the second operational amplifier U2, in the case that the first voltage is greater than the voltage of the third power supply, the output end of the second operational amplifier U2 outputs the signal of high level, so that the second comparison submodule 12 outputs the signal of high level, in the case that the first voltage is less than the voltage of the third power supply, the output end of the second operational amplifier U2 outputs the signal of low level, so that the second comparison submodule 12 outputs the signal of low level.

[0047] Optionally, in some embodiments, the acquisition module 20 comprises a seventh resistor R7, an eighth resistor R8; the first end of the seventh resistor R7 is used for being electrically connected with the first power supply 40, the second end of the seventh resistor R7 is electrically connected with the first end of the eighth resistor R8 and the input end of the comparison module 10 respectively; the second end of the eighth resistor R8 is grounded.

[0048] It should be noted that the seventh resistor R7 and the eighth resistor R8 are both voltage dividing resistors; the input end of the comparison module 10 comprises the first end of the second resistor R2 and the first end of the fifth resistor R5.

[0049] In the embodiment of the utility model, the voltage of the first power supply 40 is collected through the voltage dividing effect of the seventh resistor R7 and the eighth resistor R8, and the voltage of the eighth resistor R8 is taken as the first voltage.

[0050] Optionally, referring to Figure 2In some embodiments, the motor drive protection circuit further comprises a ninth resistor R9 and a first capacitor C1; a first end of the ninth resistor R9 is electrically connected with a first end of the first capacitor C1, a second end of the ninth resistor R9 is configured to be electrically connected with the first power supply 40; a second end of the first capacitor C1 is grounded; an input end of the acquisition module 20 is electrically connected with the first end of the first capacitor C1, and the acquisition module 20 is further configured to acquire a second voltage of the first capacitor C1 and send the second voltage to the drive module 30; a second input end of the drive module 30 is electrically connected with the second end of the ninth resistor R9, and the drive module 30 is specifically configured to supply power to the motor 50 by the first power supply 40 in the case that the first signal is acquired and the second voltage is a preset voltage value.

[0051] It should be noted that the ninth resistor R9 can reduce the possibility that the first capacitor C1 is damaged by the large current surge of the first power supply 40 at the start-up moment, and in addition, the ninth resistor R9 cooperates with the first capacitor C1 to form an RC (resistor-capacitor) filter, and the first power supply 40 charges the first capacitor C1 after the first power supply 40 is started; the second voltage being the preset voltage value indicates that the first capacitor C1 is fully charged.

[0052] In the embodiments of the utility model, the acquisition module 20 acquires the second voltage of the first capacitor C1 and sends the second voltage to the drive module 30, and then the drive module 30 supplies power to the motor 50 by the first power supply 40 in the case that the first signal is acquired and the second voltage is a preset voltage value, i.e. in the case that the capacitor is fully charged, the capacitor plays a role of voltage stabilization, and the first power supply 40 provides a power supply signal of stable voltage for the motor 50.

[0053] The RC circuit composed of the ninth resistor R9 and the first capacitor C1 charges the first capacitor C1 after the first power supply 40 is started, and in the case that the capacitor is fully charged, the capacitor plays a role of voltage stabilization, and the first power supply 40 provides a power supply signal of stable voltage for the motor 50, so as to realize soft start of the motor 50 and avoid the motor 50 from being burst by the surge current of the first power supply 40.

[0054] In addition, the drive module 30 is further configured to cut off the power supply to the motor 50 in the case that the second voltage is less than or greater than the preset voltage value, so as to realize under-voltage and over-voltage protection of the power supply to the motor 50 and avoid the motor 50 from being burst.

[0055] Optionally, in some embodiments, the motor drive protection circuit further comprises a relay K1 and a control module 60; the drive module 30 is electrically connected with the control module 60, and the drive module 30 is further configured to send a third signal to the control module 60 when the second voltage is equal to a preset voltage value, and send a fourth signal to the control module 60 when the second voltage is less than the preset voltage value; the control module 60 is electrically connected with the relay K1, and the control module 60 is configured to be electrically connected with the first power supply 40, control the relay K1 to be closed when the third signal is acquired, and control the relay K1 to be disconnected when the fourth signal is acquired; a common end of the relay K1 is configured to be electrically connected with the first power supply 40, and a normally open end of the relay K1 is electrically connected with a second input end of the drive module 30.

[0056] In the embodiment of the utility model, through drive module 30 in the case where second voltage is less than preset voltage value, fourth signal is sent to control module 60, then through control module 60 in the case where fourth signal is acquired, relay K1 is disconnected, so that the power supply signal of first power supply 40 is input to first capacitor C1 through ninth resistance R9, and first capacitor C1 is charged, through drive module 30 in the case where second voltage is equal to preset voltage value, namely in the case where capacitor is full of electricity, third signal is sent to control module 60, then through control module 60 in the case where third signal is acquired, relay K1 is closed, so that the power supply signal of first power supply 40 is output through relay K1, and then input to motor 50 through drive module 30, compared with the power supply signal of first power supply 40 being input to motor 50 through ninth resistance R9, the power loss of ninth resistance R9 is reduced.

[0057] Optionally, referring to Figure 3In some embodiments, the control module 60 comprises a first switching device Q1, a second switching device Q2, a first diode D1, a second diode D2, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14; a first end of the tenth resistor R10 is configured to be electrically connected with the first power supply 40, a second end of the tenth resistor R10 is electrically connected with a first end of the first switching device Q1; a first end of the eleventh resistor R11 is electrically connected with the second end of the tenth resistor R10, a second end of the eleventh resistor R11 is electrically connected with a first end of the twelfth resistor R12; a second end of the first switching device Q1 is electrically connected with a positive electrode of the relay K1, a control end of the first switching device Q1 is electrically connected with the first end of the twelfth resistor R12; a negative electrode of the first diode D1 is electrically connected with the positive electrode of the relay K1, a positive electrode of the first diode D1 is electrically connected with a negative electrode of the relay K1; a second end of the twelfth resistor R12 is electrically connected with a first end of the second switching device Q2; a positive electrode of the second diode D2 is electrically connected with a control output end of the driving module 30, a negative electrode of the second diode D2 is electrically connected with a first end of the thirteenth resistor R13; a second end of the thirteenth resistor R13 is electrically connected with a control end of the second switching device Q2; a first end of the fourteenth resistor R14 is electrically connected with the second end of the thirteenth resistor R13, a second end of the fourteenth resistor R14 is grounded; a second end of the second switching device Q2 is grounded; the negative electrode of the relay K1 is grounded.

[0058] It should be noted that the tenth resistor R10 and the thirteenth resistor R13 are current limiting resistors, the eleventh resistor R11 and the twelfth resistor R12 are voltage dividing resistors, and the fourteenth resistor R14 is a pull-down resistor; the first diode D1 is used to discharge the current generated by the reverse induced voltage of the relay K1 when the relay K1 changes from the on state to the off state; the second diode D2 is an anti-reverse diode.

[0059] Specifically, in some embodiments, the first switch device Q1 can be a PMOS tube (positive channel Metal Oxide Semiconductor, positive channel metal oxide semiconductor tube); the second switch device Q2 can be an NPN triode, wherein the NPN triode is composed of three semiconductor blocks, including two N (Negative Electricity, negative electricity) type semiconductor blocks (electron type semiconductor) and a P (Positive Electricity, positive electricity) type semiconductor block (hole type semiconductor), the P type semiconductor is in the middle, and the two N type semiconductors are on both sides; the source of the first switch device Q1 is electrically connected with the second end of the tenth resistor R10, the drain of the first switch device Q1 is electrically connected with the positive electrode of the relay K1, and the gate of the first switch device Q1 is electrically connected with the first end of the twelfth resistor R12; the collector of the second switch device Q2 is electrically connected with the second end of the twelfth resistor R12, the emitter of the second switch device Q2 is grounded, and the base of the second switch device Q2 is electrically connected with the second end of the thirteenth resistor R13.

[0060] In other embodiments, the first switch device Q1 can be a PMOS tube (positive channel Metal Oxide Semiconductor, positive channel metal oxide semiconductor tube); the second switch device Q2 can be an NMOS tube (Negative channel-Metal-Oxide-Semiconductor, negative channel metal oxide semiconductor tube); the source of the first switch device Q1 is electrically connected with the second end of the tenth resistor R10, the drain of the first switch device Q1 is electrically connected with the positive electrode of the relay K1, and the gate of the first switch device Q1 is electrically connected with the first end of the twelfth resistor R12; the drain of the second switch device Q2 is electrically connected with the second end of the twelfth resistor R12, the source of the second switch device Q2 is grounded, and the gate of the second switch device Q2 is electrically connected with the second end of the thirteenth resistor R13.

[0061] In the embodiment of the utility model, through drive module 30 control second switch device Q2 conduction, make first switch device Q1 conduction, relay K1 conduction conduction, ninth resistor R9 short circuit; through drive module 30 control second switch device Q2 shut off, make first switch device Q1 shut off, relay K1 power off shut off, the power supply current of first power supply 40 passes through ninth resistor R9.

[0062] Optionally, with reference to Figure 4In some embodiments, the control module 60 comprises a third switching device Q3, a third diode D3, a fourth diode D4, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17; the first end of the fifteenth resistor R15 is used for electrically connecting with the first power supply 40, and the second end of the fifteenth resistor R15 is electrically connected with the positive electrode of the relay K1; the negative electrode of the third diode D3 is electrically connected with the positive electrode of the relay K1, and the positive electrode of the third diode D3 is electrically connected with the negative electrode of the relay K1; the positive electrode of the fourth diode D4 is electrically connected with the control output end of the driving module 30, and the negative electrode of the fourth diode D4 is electrically connected with the first end of the sixteenth resistor R16; the second end of the sixteenth resistor R16 is electrically connected with the control end of the third switching device Q3; the first end of the third switching device Q3 is electrically connected with the negative electrode of the relay K1, and the second end of the third switching device Q3 is grounded; the first end of the seventeenth resistor R17 is electrically connected with the second end of the sixteenth resistor R16, and the second end of the seventeenth resistor R17 is grounded.

[0063] It should be noted that the fifteenth resistor R15 and the sixteenth resistor R16 are current limiting resistors, and the seventeenth resistor R17 is a pull-down resistor; the third diode D3 is used for discharging the current generated by the reverse induced voltage of the relay K1 in the case that the relay K1 changes from the on state to the off state; and the fourth diode D4 is an anti-reverse diode.

[0064] Specifically, in some embodiments, the third switching device Q3 can be an NMOS tube, the drain of the third switching device Q3 is electrically connected with the negative electrode of the relay K1, the source of the third switching device Q3 is grounded, and the gate of the third switching device Q3 is electrically connected with the second end of the sixteenth resistor R16.

[0065] In the embodiment of the utility model, through driving module 30 control third switching device Q3 conduction, make the negative pole of relay K1 ground, relay K1 power on conduction, make ninth resistor R9 short circuit, through driving module 30 control third switching device Q3 off, make the negative pole of relay K1 hang, relay K1 power off off, the power supply current of first power supply 40 passes through ninth resistor R9.

[0066] Optionally, in some embodiments, the acquisition module 20 comprises a seventh resistor R7, an eighth resistor R8, an eighteenth resistor R18 and a nineteenth resistor R19; a first end of the seventh resistor R7 is configured to be electrically connected with the first power supply 40, a second end of the seventh resistor R7 is electrically connected with a first end of the eighth resistor R8 and an input end of the comparison module 10 respectively; a second end of the eighth resistor R8 is grounded; a first end of the eighteenth resistor R18 is electrically connected with a first end of the first capacitor C1, a second end of the eighteenth resistor R18 is electrically connected with a first end of the nineteenth resistor R19 and a third input end of the driving module 30 respectively; a second end of the nineteenth resistor R19 is grounded.

[0067] It should be noted that the seventh resistor R7, the eighth resistor R8, the eighteenth resistor R18 and the nineteenth resistor R19 are all voltage dividing resistors; the input end of the comparison module 10 comprises a first end of the second resistor R2 and a first end of the fifth resistor R5.

[0068] In the embodiment of the utility model, through the voltage dividing effect of the seventh resistor R7 and the eighth resistor R8, the voltage of the first power supply 40 is acquired, and the voltage of the eighth resistor R8 is the first voltage; through the voltage dividing effect of the eighteenth resistor R18 and the nineteenth resistor R19, the voltage of the first capacitor C1 is acquired, and the voltage of the nineteenth resistor R19 is the second voltage.

[0069] Optionally, in some embodiments, the driving module 30 comprises a micro control unit 31 and a driving submodule 32; the micro control unit 31 is electrically connected with the comparison module 10 and the driving submodule 32 respectively, the micro control unit 31 is configured to send a fifth signal to the driving submodule 32 in the case of acquiring the first signal, and send a sixth signal to the driving submodule 32 in the case of acquiring the second signal; the driving submodule 32 is configured to be electrically connected with the first power supply 40 and the motor 50 respectively, supply power to the motor 50 through the first power supply 40 in the case of acquiring the fifth signal, and cut off the power supply of the motor 50 in the case of acquiring the sixth signal.

[0070] It should be noted that the first input end of the micro control unit 31 is the first input end of the driving module 30, the control output end of the micro control unit 31 is the control output end of the driving module 30, and the second input end of the micro control unit 31 is the third input end of the driving module 30.

[0071] In the embodiment of the utility model, through acquisition module 20 gathers the first voltage of first power supply 40 and sends to comparison module 10, again through comparison module 10 under the condition that first voltage is greater than first threshold value and first voltage is less than second threshold value, first signal is sent to micro control unit 31, then through micro control unit 31 under the condition that first signal is obtained, fifth signal is sent to drive submodule 32, again through drive submodule 32 under the condition that fifth signal is obtained, motor 50 is powered by first power supply 40, and through comparison module 10 under the condition that first voltage is less than first threshold value or first voltage is greater than second threshold value, second signal is sent to micro control unit 31, then through micro control unit 31 under the condition that second signal is obtained, sixth signal is sent to drive submodule 32, again through drive submodule 32 under the condition that sixth signal is obtained, motor 50 is powered off, to avoid the voltage of first power supply overvoltage, under voltage cause motor 50 abnormal, reduced the risk of motor 50 explosion.

[0072] Optionally, referring to Figure 5 In some embodiments, the drive submodule 32 includes a plurality of drive units 321, and the motor 50 includes a plurality of phase input terminals, and the drive units 321 correspond to the phase input terminals one by one.

[0073] Referring to Figure 6Each of the drive units 321 comprises a drive chip U3, a fourth switching device Q4, a fifth switching device Q5, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, and a twenty-third resistor R23. In the drive unit 321, the first input end U1-2 of the drive chip U3 is electrically connected to the first output end 311 of the micro control unit 31, the second input end U1-3 of the drive chip U3 is electrically connected to the second output end 312 of the micro control unit 31, the first output end U1-7 of the drive chip U3 is electrically connected to the first end of the twentieth resistor R20, the second output end U1-5 of the drive chip U3 is electrically connected to the first end of the twenty-second resistor R22, and the third output end U1-6 of the drive chip U3 is electrically connected to the phase input end corresponding to the drive unit 321. The second end of the twentieth resistor R20 is electrically connected to the control end of the fourth switching device Q4. The first end of the twenty-first resistor R21 is electrically connected to the control end of the fourth switching device Q4, and the second end of the twenty-first resistor R21 is electrically connected to the second end of the fourth switching device Q4. The first end of the fourth switching device Q4 is electrically connected to the first power supply 40, and the second end of the fourth switching device Q4 is electrically connected to the phase input end corresponding to the drive unit 321. The second end of the twenty-second resistor R22 is electrically connected to the control end of the fifth switching device Q5. The first end of the twenty-third resistor R23 is electrically connected to the control end of the fifth switching device Q5, and the second end of the twenty-third resistor R23 is electrically connected to the second end of the fifth switching device Q5. The first end of the fifth switching device Q5 is electrically connected to the phase input end corresponding to the drive unit 321, and the second end of the fifth switching device Q5 is grounded.

[0074] In some embodiments, each driving unit 321 further comprises a sixth diode D6, a seventh diode D7, an eighth diode D8, a second capacitor C2, a third capacitor C3, a twenty-seventh resistor R27, a twenty-eighth resistor R28, and an external interface J1; in the driving unit 321, the positive electrode of the sixth diode D6 is electrically connected to the first power supply end U1-1 of the driving chip U3, and the negative electrode of the sixth diode D6 is electrically connected to the second power supply end U1-8 of the driving chip U3; the negative electrode of the seventh diode D7 is electrically connected to the first output end U1-7 of the driving chip U3, and the positive electrode of the seventh diode D7 is electrically connected to the first end of the twenty-seventh resistor R27; the second end of the twenty-seventh resistor R27 is electrically connected to the first end of the twenty-first resistor R21; the negative electrode of the eighth diode D8 is electrically connected to the second output end U1-5 of the driving chip U3, and the positive electrode of the eighth diode D8 is electrically connected to the first end of the twenty-eighth resistor R28; the second end of the twenty-eighth resistor R28 is electrically connected to the first end of the twenty-third resistor R23; the first end of the second capacitor C2 is electrically connected to the fifth power supply, and the second end of the second capacitor C2 is grounded; the first end of the third capacitor C3 is electrically connected to the second power supply end U1-8 of the driving chip U3, and the second end of the third capacitor C3 is electrically connected to the third output end U1-6 of the driving chip U3; the external interface J1 is electrically connected to the third output end U1-6 of the driving chip U3, the second end of the fourth switching device Q4, and the first end of the fifth switching device Q5, respectively, and is used to be electrically connected to the corresponding phase input end of the driving unit 321.

[0075] It should be noted that the first power supply end U1-1 of the driving chip U3 is electrically connected to the fifth power supply, and the ground end U1-4 of the driving chip U3 is grounded; the twentieth resistor R20, the twenty-second resistor R22, the twenty-seventh resistor R27, and the twenty-eighth resistor R28 are current-limiting resistors, the twenty-first resistor R21 and the twenty-third resistor R23 are voltage-dividing resistors, the sixth diode D6, the seventh diode D7, and the eighth diode D8 are anti-reverse diodes, and the second capacitor C2 and the third capacitor C3 are filter capacitors; the second input end of the driving module 30 comprises the first end of each fourth switching device Q4.

[0076] Specifically, in some embodiments, the fourth switch Q4 and the fifth switch Q5 can be an insulated gate bipolar transistor (IGBT), and types of the insulated gate bipolar transistor include an N (Negative Electricity) channel type insulated gate bipolar transistor and a P (Positive Electricity) channel type insulated gate bipolar transistor; in other embodiments, the fourth switch Q4 and the fifth switch Q5 can be a MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor), and types of the MOS tube include an NMOS tube and a PMOS tube.

[0077] In the embodiments of the utility model, the fourth switch Q4 and the fifth switch Q5 constitute one bridge arm of an inverter of the motor 50, for example, the fourth switch Q4 is an upper arm of the bridge arm, and the fifth switch Q5 is a lower arm of the bridge arm.

[0078] Optionally, in some embodiments, the motor drive protection circuit comprises a twenty-fourth resistor R24 and a current detection module 70; a first end of the twenty-fourth resistor R24 is electrically connected with a second end of the fifth switch Q5, and a second end of the twenty-fourth resistor R24 is grounded; an input end of the current detection module 70 is electrically connected with the first end of the twenty-fourth resistor R24, and an output end of the current detection module 70 is electrically connected with a first input end of the micro control unit 31; the current detection module 70 is used for determining that the current of the fifth switch Q5 is abnormal and sending a seventh signal to the micro control unit 31 when a voltage of the twenty-fourth resistor R24 is greater than a third threshold value; and the micro control unit 31 is further used for powering off the motor 50 when the seventh signal is acquired.

[0079] It should be noted that reasons for the current abnormality of the fifth switch Q5 include current abnormality of the motor 50, abnormality of the drive unit 321, etc.

[0080] Specifically, the micro control unit 31 sends a control signal to the drive chip U3, so that the drive chip U3 controls the fourth switch Q4 in each drive unit 321 to be turned off, thereby powering off the motor 50.

[0081] In the embodiment of the utility model, through the twenty fourth resistance R24 gathers the current of fifth switch device Q5, again through current detection module 70 in the case where the voltage of twenty fourth resistance R24 is greater than third threshold value, determine that the current of fifth switch device Q5 is abnormal, and send seventh signal to micro control unit 31, then through micro control unit 31 in the case where seventh signal is acquired, the motor 50 is powered off, to avoid abnormal current to cause motor 50 to burst.

[0082] Optionally, in some embodiments, the current detection module 70 includes a third operational amplifier U4, a twenty-fifth resistor R25, a twenty-sixth resistor R26, and a fifth diode D5. The first end of the twenty-fifth resistor R25 is electrically connected to the fourth power supply. The second end of the twenty-fifth resistor R25 is electrically connected to the non-inverting input terminal of the third operational amplifier U4. The first end of the twenty-sixth resistor R26 is electrically connected to the first end of the twenty-fourth resistor R24. The second end of the twenty-sixth resistor R26 is electrically connected to the inverting input terminal of the third operational amplifier U4. The output terminal of the third operational amplifier U4 is electrically connected to the anode of the fifth diode D5. The cathode of the fifth diode D5 is electrically connected to the first input terminal of the micro control unit 31.

[0083] It should be noted that the twenty-fifth resistor R25 is the input resistance of the inverting input terminal of the third operational amplifier U4, and the twenty-sixth resistor R26 is the input resistance of the non-inverting input terminal of the third operational amplifier U4. The fifth diode D5 is a reverse prevention diode. The voltage of the fourth power supply is the third threshold value, and the seventh signal is a low-level signal.

[0084] In the embodiment of the utility model, the voltage of the twenty-fourth resistor R24 is compared with the voltage of the fourth power supply by the third operational amplifier U4. In the case where the voltage of the twenty-fourth resistor R24 is greater than the voltage of the fourth power supply, the third operational amplifier U4 outputs a low-level signal, so that the current detection module 70 outputs the seventh signal.

[0085] The embodiment of the utility model can avoid the surge current, overvoltage, undervoltage of the first power supply 40 and the current abnormality of the motor 50, prevent the motor 50 from bursting, and improve the personal safety, equipment safety, and equipment reliability of the staff.

[0086] In the embodiment of the utility model, through the acquisition module 20 gathers the first voltage of the first power supply 40 and sends to the comparison module 10, then through the comparison module 10 under the condition that the first voltage is greater than the first threshold value and the first voltage is less than the second threshold value, the first signal is sent to the drive module 30, then through the drive module 30 under the condition that the first signal is acquired, the first power supply 40 is controlled to power the motor 50, and through the comparison module 10 under the condition that the first voltage is less than the first threshold value or the first voltage is greater than the second threshold value, the second signal is sent to the drive module 30, then through the drive module 30 under the condition that the second signal is acquired, the motor 50 is powered off, to avoid the voltage of the first power supply overvoltage, under-voltage causes the motor 50 abnormal, reduce the risk of motor 50 explosion.

[0087] Finally, it should also be noted that in this paper, such as "first" and "second" and other relational terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal device.

[0088] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0089] The above is only the specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A motor drive protection circuit, characterized by, The application relates to a power supply control method and device. The application comprises a collection module (20), a comparison module (10) and a driving module (30); The collection module (20) is electrically connected with the comparison module (10), the collection module (20) is electrically connected with a first power supply (40), the first voltage of the first power supply (40) is collected and sent to the comparison module (10); The comparison module (10) is electrically connected with the driving module (30), the comparison module (10) is used for sending a first signal to the driving module (30) when the first voltage is greater than a first threshold value and the first voltage is less than a second threshold value, and sending a second signal to the driving module (30) when the first voltage is less than the first threshold value or the first voltage is greater than the second threshold value; The driving module (30) is electrically connected with the first power supply (40) and the motor (50) respectively, the motor (50) is powered by the first power supply (40) when the first signal is acquired, and the motor (50) is powered off when the second signal is acquired.

2. The motor drive protection circuit of claim 1, wherein, The comparison module (10) comprises a first comparison sub-module (11) and a second comparison sub-module (12); The first comparison sub-module (11) is electrically connected with the collection module (20) and the driving module (30) respectively, the first comparison sub-module (11) is used for sending a first-level signal to the driving module (30) when the first voltage is greater than the first threshold value, and sending a second-level signal to the driving module (30) when the first voltage is less than the first threshold value; The second comparison sub-module (12) is electrically connected with the collection module (20) and the driving module (30) respectively, the second comparison sub-module (12) is used for sending a first-level signal to the driving module (30) when the first voltage is less than the second threshold value, and sending a second-level signal to the driving module (30) when the first voltage is greater than the second threshold value; The first signal is used for representing that the first comparison sub-module (11) sends the first-level signal and the second comparison sub-module (12) sends the first-level signal, and the second signal is used for representing that the first comparison sub-module (11) sends the second-level signal or the second comparison sub-module (12) sends the second-level signal. The first comparison sub-module (11) comprises a first operational amplifier (U1), a first resistor (R1), a second resistor (R2) and a third resistor (R3); 3. The motor drive protection circuit of claim 2, wherein, The first end of the first resistor (R1) is electrically connected with a second power supply, the second end of the first resistor (R1) is electrically connected with the non-inverting input end of the first operational amplifier (U1); The first end of the second resistor (R2) is electrically connected with the output end of the collection module (20), and the second end of the second resistor (R2) is electrically connected with the inverting input end of the first operational amplifier (U1); ​ An output end of the first operational amplifier (U1) is electrically connected with a first input end of the driving module (30); A first end of the third resistor (R3) is electrically connected with a third power supply, and a second end of the third resistor (R3) is electrically connected with the first input end of the driving module (30).

4. The motor drive protection circuit of claim 2, wherein, The second comparison submodule (12) comprises a second operational amplifier (U2), a fourth resistor (R4), a fifth resistor (R5), and a sixth resistor (R6); A first end of the fourth resistor (R4) is electrically connected with a second power supply, and a second end of the fourth resistor (R4) is electrically connected with an inverting input end of the second operational amplifier (U2); A first end of the fifth resistor (R5) is electrically connected with an output end of the acquisition module (20), and a second end of the fifth resistor (R5) is electrically connected with a non-inverting input end of the second operational amplifier (U2); An output end of the second operational amplifier (U2) is electrically connected with the first input end of the driving module (30); A first end of the sixth resistor (R6) is electrically connected with the third power supply, and a second end of the sixth resistor (R6) is electrically connected with the first input end of the driving module (30).

5. The motor drive protection circuit of claim 1, wherein, The acquisition module (20) comprises a seventh resistor (R7) and an eighth resistor (R8); A first end of the seventh resistor (R7) is electrically connected with the first power supply (40), and a second end of the seventh resistor (R7) is electrically connected with a first end of the eighth resistor (R8) and an input end of the comparison module (10) respectively; A second end of the eighth resistor (R8) is grounded.

6. The motor drive protection circuit of claim 1, wherein, The motor driving protection circuit further comprises a ninth resistor (R9) and a first capacitor (C1); A first end of the ninth resistor (R9) is electrically connected with a first end of the first capacitor (C1), and a second end of the ninth resistor (R9) is electrically connected with the first power supply (40); A second end of the first capacitor (C1) is grounded; An input end of the acquisition module (20) is electrically connected with the first end of the first capacitor (C1), and the acquisition module (20) is further used for acquiring a second voltage of the first capacitor (C1) and sending the second voltage to the driving module (30); A second input end of the driving module (30) is electrically connected with the second end of the ninth resistor (R9), and the driving module (30) is specifically used for supplying power to the motor (50) through the first power supply (40) in a case where the first signal is acquired and the second voltage is a preset voltage value.

7. The motor drive protection circuit of claim 6, wherein, The motor driving protection circuit further comprises a relay (K1) and a control module (60); The driving module (30) is electrically connected with the control module (60), and the driving module (30) is further used for sending a third signal to the control module (60) in a case where the second voltage is equal to the preset voltage value, and sending a fourth signal to the control module (60) in a case where the second voltage is less than the preset voltage value. The control module (60) is electrically connected with the relay (K1), and the control module (60) is used for being electrically connected with the first power supply (40), and in the case that the third signal is acquired, the relay (K1) is controlled to be closed; In the case that the fourth signal is acquired, the relay (K1) is controlled to be opened; The common end of the relay (K1) is used for being electrically connected with the first power supply (40), and the normally open end of the relay (K1) is electrically connected with the second input end of the driving module (30).

8. The motor drive protection circuit of claim 7, wherein, The control module (60) comprises a first switch device (Q1), a second switch device (Q2), a first diode (D1), a second diode (D2), a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), and a fourteenth resistor (R14); The first end of the tenth resistor (R10) is used for being electrically connected with the first power supply (40), and the second end of the tenth resistor (R10) is electrically connected with the first end of the first switch device (Q1); The first end of the eleventh resistor (R11) is electrically connected with the second end of the tenth resistor (R10), and the second end of the eleventh resistor (R11) is electrically connected with the first end of the twelfth resistor (R12); The second end of the first switch device (Q1) is electrically connected with the positive electrode of the relay (K1), and the control end of the first switch device (Q1) is electrically connected with the first end of the twelfth resistor (R12); The negative electrode of the first diode (D1) is electrically connected with the positive electrode of the relay (K1), and the positive electrode of the first diode (D1) is electrically connected with the negative electrode of the relay (K1); The second end of the twelfth resistor (R12) is electrically connected with the first end of the second switch device (Q2); The positive electrode of the second diode (D2) is electrically connected with the control output end of the driving module (30), and the negative electrode of the second diode (D2) is electrically connected with the first end of the thirteenth resistor (R13); The second end of the thirteenth resistor (R13) is electrically connected with the control end of the second switch device (Q2); The first end of the fourteenth resistor (R14) is electrically connected with the second end of the thirteenth resistor (R13), and the second end of the fourteenth resistor (R14) is grounded; The second end of the second switch device (Q2) is grounded, and the negative electrode of the relay (K1) is grounded.

9. The motor drive protection circuit of claim 7, wherein, The control module (60) comprises a third switch device (Q3), a third diode (D3), a fourth diode (D4), a fifteenth resistor (R15), a sixteenth resistor (R16), and a seventeenth resistor (R17); The first end of the fifteenth resistor (R15) is used for being electrically connected with the first power supply (40), and the second end of the fifteenth resistor (R15) is electrically connected with the positive electrode of the relay (K1); The negative electrode of the third diode (D3) is electrically connected with the positive electrode of the relay (K1), and the positive electrode of the third diode (D3) is electrically connected with the negative electrode of the relay (K1); The anode of the fourth diode (D4) is electrically connected with the control output end of the driving module (30), and the cathode of the fourth diode (D4) is electrically connected with the first end of the sixteenth resistor (R16); The second end of the sixteenth resistor (R16) is electrically connected with the control end of the third switch device (Q3); The first end of the third switch device (Q3) is electrically connected with the negative electrode of the relay (K1), and the second end of the third switch device (Q3) is grounded; The first end of the seventeenth resistor (R17) is electrically connected with the second end of the sixteenth resistor (R16), and the second end of the seventeenth resistor (R17) is grounded.

10. The motor drive protection circuit of claim 6, wherein, The acquisition module (20) comprises a seventh resistor (R7), an eighth resistor (R8), an eighteenth resistor (R18), and a nineteenth resistor (R19); The first end of the seventh resistor (R7) is used for being electrically connected with the first power supply (40), and the second end of the seventh resistor (R7) is electrically connected with the first end of the eighth resistor (R8) and the input end of the comparison module (10) respectively; The second end of the eighth resistor (R8) is grounded; The first end of the eighteenth resistor (R18) is electrically connected with the first end of the first capacitor (C1), and the second end of the eighteenth resistor (R18) is electrically connected with the first end of the nineteenth resistor (R19) and the third input end of the driving module (30) respectively; The second end of the nineteenth resistor (R19) is grounded.

11. The motor drive protection circuit of claim 1, wherein, The driving module (30) comprises a micro control unit (31) and a driving submodule (32); The micro control unit (31) is electrically connected with the comparison module (10) and the driving submodule (32) respectively, and the micro control unit (31) is used for sending a fifth signal to the driving submodule (32) in the case of acquiring the first signal, and sending a sixth signal to the driving submodule (32) in the case of acquiring the second signal; The driving submodule (32) is used for being electrically connected with the first power supply (40) and the motor (50) respectively, and the driving submodule (32) is used for supplying power to the motor (50) through the first power supply (40) in the case of acquiring the fifth signal, and the driving submodule (32) is used for powering off the motor (50) in the case of acquiring the sixth signal.

12. The motor drive protection circuit of claim 11, wherein, The driving submodule (32) comprises a plurality of driving units (321), the motor (50) comprises a plurality of phase input ends, the driving units (321) correspond to the phase input ends one by one, each driving unit (321) comprises a driving chip (U3), a fourth switch device (Q4), a fifth switch device (Q5), a twentieth resistor (R20), a twenty-first resistor (R21), a twenty-second resistor (R22), and a twenty-third resistor (R23). In the driving unit (321), the first input end U1-2 of the driving chip (U3) is electrically connected with the first output end (311) of the micro control unit (31), the second input end (U1-3) of the driving chip (U3) is electrically connected with the second output end (312) of the micro control unit (31), the first output end (U1-7) of the driving chip (U3) is electrically connected with the first end of the twentieth resistor (R20), the second output end (U1-5) of the driving chip (U3) is electrically connected with the first end of the twenty-second resistor (R22), and the third output end (U1-6) of the driving chip (U3) is electrically connected with the corresponding phase input end of the driving unit (321); The second end of the twentieth resistor (R20) is electrically connected with the control end of the fourth switch device (Q4); The first end of the twenty-first resistor (R21) is electrically connected with the control end of the fourth switch device (Q4), and the second end of the twenty-first resistor (R21) is electrically connected with the second end of the fourth switch device (Q4); The first end of the fourth switch device (Q4) is electrically connected with the first power supply (40), and the second end of the fourth switch device (Q4) is electrically connected with the corresponding phase input end of the driving unit (321); The second end of the twenty-second resistor (R22) is electrically connected with the control end of the fifth switch device (Q5); The first end of the twenty-third resistor (R23) is electrically connected with the control end of the fifth switch device (Q5), and the second end of the twenty-third resistor (R23) is electrically connected with the second end of the fifth switch device (Q5); The first end of the fifth switch device (Q5) is electrically connected with the corresponding phase input end of the driving unit (321), and the second end of the fifth switch device (Q5) is grounded.

13. The motor drive protection circuit of claim 12, wherein, The motor driving protection circuit comprises a twenty-fourth resistor (R24) and a current detection module (70); The first end of the twenty-fourth resistor (R24) is electrically connected with the second end of the fifth switch device (Q5), and the second end of the twenty-fourth resistor (R24) is grounded. The input end of the current detection module (70) is electrically connected with the first end of the twenty-fourth resistor (R24), the output end of the current detection module (70) is electrically connected with the first input end of the micro control unit (31), and the current detection module (70) is used for determining that the current of the fifth switch device (Q5) is abnormal and sending a seventh signal to the micro control unit (31) when the voltage of the twenty-fourth resistor (R24) is greater than a third threshold value. The micro control unit (31) is further used for powering off the motor (50) when the seventh signal is acquired.

14. The motor drive protection circuit of claim 13, wherein, The current detection module (70) comprises a third operational amplifier (U4), a twenty-fifth resistor (R25), a twenty-sixth resistor (R26) and a fifth diode (D5). A first end of the twenty-fifth resistor (R25) is configured to be electrically connected with a fourth power supply, and a second end of the twenty-fifth resistor (R25) is electrically connected with a non-inverting input terminal of the third operational amplifier (U4); A first end of the twenty-sixth resistor (R26) is electrically connected with a first end of the twenty-fourth resistor (R24), and a second end of the twenty-sixth resistor (R26) is electrically connected with an inverting input terminal of the third operational amplifier (U4); An output terminal of the third operational amplifier (U4) is electrically connected with a positive electrode of the fifth diode (D5); A negative electrode of the fifth diode (D5) is electrically connected with a first input terminal of the micro control unit (31).

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