CN114597882A - Motor drive circuit for preventing reverse electromotive force - Google Patents
Motor drive circuit for preventing reverse electromotive force Download PDFInfo
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- CN114597882A CN114597882A CN202210269935.4A CN202210269935A CN114597882A CN 114597882 A CN114597882 A CN 114597882A CN 202210269935 A CN202210269935 A CN 202210269935A CN 114597882 A CN114597882 A CN 114597882A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- Control Of Direct Current Motors (AREA)
Abstract
The invention provides a motor drive circuit for preventing reverse electromotive force, comprising: the first input end of the motor driving module is connected with a first input power supply, and the second input end of the motor driving module is connected with the first output end of the main control module; the input end of the voltage reduction module is connected with the first input power supply, and the output end of the voltage reduction module is connected with the first input end of the main control module and is used for reducing the voltage input by the first input power supply and supplying power to the main control module; the input end of the power supply sampling module is connected with a first input power supply, and the output end of the power supply sampling module is connected with the second input end of the main control module and is used for collecting the real-time voltage value of the reverse electromotive force generated by the motor driving module; the first input end of the discharging module is connected with the first input power supply, and the second input end of the discharging module is connected with the main control module; the main control module controls the discharge module to be conducted when the real-time voltage value is larger than the preset voltage value so as to reduce the real-time voltage value of the back electromotive force. The circuit has the beneficial effects that the circuit can control the discharging module to be conducted to reduce the real-time voltage value protection circuit when the real-time voltage value is larger than the preset voltage value.
Description
Technical Field
The invention relates to the technical field of reverse electromotive force prevention, in particular to a motor driving circuit for preventing reverse electromotive force.
Background
With the increasingly wide application of motor driving, in practical application, a motor generates certain back electromotive force when the motor stops running, the back electromotive force can impact a front-end power adapter and components, and even damage the power adapter and the components, so that the protection circuit is particularly important.
However, no protection measure is designed for the back electromotive force generated by the motor in the current motor driving circuit, and the situation is only relieved by improving the withstand voltage parameter of the component, but the cost of the component can be greatly improved, resource waste is caused, and the component can be damaged along with the increase of the service time, so that the problem cannot be solved.
Disclosure of Invention
To solve the problems in the prior art, the present invention provides a motor driving circuit for preventing back electromotive force, comprising:
the first input end of the motor driving module is connected with an external first input power supply, and the second input end of the motor driving module is connected with the first output end of a main control module;
the input end of the voltage reduction module is connected with the first input power supply, the output end of the voltage reduction module is connected with the first input end of the main control module, and the voltage reduction module is used for reducing the voltage input by the input power supply and supplying power to the main control module;
the input end of the power supply sampling module is connected with the first input power supply, the output end of the power supply sampling module is connected with the second input end of the main control module, and the real-time voltage value of a reverse electromotive force generated by the motor driving module is collected through the power supply sampling module and is output to the main control module;
the first input end of the discharging module is connected with the first input power supply, and the second input end of the discharging module is connected with the main control module;
the main control module compares the real-time voltage value with a preset voltage value and controls the discharge module to be conducted to reduce the real-time voltage value when the real-time voltage value is larger than the preset voltage value.
Preferably, the motor driving module includes:
the first power interface is connected with the first input power supply;
the grid electrode of the first field effect transistor is connected with the first output end of the main control module, the drain electrode of the first field effect transistor is connected with the first power interface, and the source electrode of the first field effect transistor is connected with one end of a motor;
the grid electrode of the second field effect transistor is connected with the first output end of the main control module, and the drain electrode of the second field effect transistor is connected with one end of the motor;
a grid electrode of the third field effect transistor is connected with the first output end of the main control module, a drain electrode of the third field effect transistor is connected with the first power supply interface, and a source electrode of the third field effect transistor is connected with the other end of the motor;
a grid electrode of the fourth field effect transistor is connected with the first output end of the main control module, and a drain electrode of the fourth field effect transistor is connected with the other end of the motor;
one end of the first resistor is connected with the source electrode of the fourth field effect transistor and the source electrode of the second field effect transistor respectively, and the other end of the first resistor is grounded;
the first power interface is used as the first input end of the motor driving module, and the grid electrode of the first field effect transistor, the grid electrode of the second field effect transistor, the grid electrode of the third field effect transistor and the grid electrode of the fourth field effect transistor are used as the second input end of the motor driving module;
and when the motor stops, the motor generates the reverse electromotive force and transmits the reverse electromotive force to the input end of the power supply sampling module through the first power supply interface.
Preferably, one end of the motor is connected with an anode port, the other end of the motor is connected with a cathode port, and the motor is powered by a second external input power supply connected with the anode port and the cathode port.
Preferably, the first field effect transistor and the fourth field effect transistor are forward rotation field effect transistors, and the main control module outputs a first pulse width modulation signal to the gate of the first field effect transistor and the gate of the fourth field effect transistor to control the first field effect transistor and the fourth field effect transistor to be switched on, and controls the motor to rotate forward through the first field effect transistor and the fourth field effect transistor.
Preferably, the second field effect transistor and the third field effect transistor are inverse field effect transistors, and the main control module outputs a second pulse width modulation signal to the gate of the second field effect transistor and the gate of the third field effect transistor to control the second field effect transistor and the third field effect transistor to be switched on, and controls the motor to perform inverse rotation through the second field effect transistor and the third field effect transistor.
Preferably, the power sampling module includes:
the second power interface is connected with the first input power supply;
one end of the second resistor is connected with the second power interface;
one end of the third resistor is connected with the other end of the second resistor, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with the other end of the second resistor, and the other end of the fourth resistor is connected with a first voltage output interface;
one end of the first capacitor is connected with the other end of the fourth resistor, and the other end of the first capacitor is grounded;
the second power supply interface is used as the input end of the power supply sampling module, and the first voltage output interface is used as the output end of the power supply sampling module;
and the second power supply interface receives the reverse electromotive force output by the motor driving module and outputs the real-time voltage value of the reverse electromotive force to the main control module through the first voltage output interface.
Preferably, the discharge module includes:
the third power interface is connected with the first input power supply;
a cathode of the diode is connected with the third power interface;
the fifth resistor is connected in parallel with two ends of the diode;
the collector of the triode is connected with the anode of the diode, and the emitter of the triode is grounded;
one end of the sixth resistor is connected with the base electrode of the triode, and the other end of the sixth resistor is connected with the emitting electrode of the triode;
one end of the seventh resistor is connected with the base electrode of the triode, and the other end of the seventh resistor is connected with a signal input interface;
the third power interface is used as the first input end of the discharging module, and the signal input interface is used as the second input end of the discharging module;
the main control module outputs a control signal when the real-time voltage value is larger than the preset voltage value, receives the control signal through the signal input interface and controls the triode to be opened according to the control signal so as to reduce the real-time voltage value.
Preferably, the voltage reduction module includes:
the fourth power interface is connected with the first input power supply;
the anode of the first filter capacitor is connected with the fourth power interface;
the second capacitor is connected in parallel to two ends of the first filter capacitor, one end of the second capacitor is respectively connected with the fourth power interface and one end of the first filter capacitor, and the other end of the second capacitor is connected with the negative electrode of the first filter capacitor;
one end of the eighth resistor is connected with one end of the second capacitor and the fifth pin of the voltage reduction chip respectively, and the other end of the eighth resistor is connected with the fourth pin of the voltage reduction chip;
one end of the ninth resistor is connected with the second pin of the voltage reduction chip, and the other end of the ninth resistor is connected with the third pin of the voltage reduction chip;
one end of the third capacitor is connected with the first pin of the voltage reduction chip, and one end of the third capacitor is connected with the sixth pin of the voltage reduction chip;
one end of the inductor is connected with the other end of the third capacitor;
one end of the tenth resistor is connected with the other end of the inductor, and the other end of the tenth resistor is connected with the third pin of the voltage reduction chip;
the positive electrode of the second filter capacitor is respectively connected with the other end of the inductor and a second voltage output interface, and the negative electrode of the second filter capacitor is grounded;
the fourth capacitor is connected in parallel to two ends of the second filter capacitor, one end of the fourth capacitor is respectively connected with the anode of the second filter capacitor and the second voltage output interface, and the other end of the fourth capacitor is connected with the cathode of the second filter capacitor;
the fourth power input interface is used as the input end of the voltage reduction module, and the second voltage output interface is used as the output end of the voltage reduction module;
and the voltage of the first input power supply input by the fourth power supply input interface is reduced by the voltage reduction chip and is output to the main control module through the second voltage output interface to supply power for the main control module.
The technical scheme has the following advantages or beneficial effects: the motor driving circuit acquires the real-time voltage value of the back electromotive force generated when the motor stops running through the power supply sampling module, and controls the discharge module to be conducted when the real-time voltage value is larger than the preset voltage value so as to reduce the real-time voltage value protection circuit of the back electromotive force.
Drawings
FIG. 1 is a schematic diagram of a motor driving circuit according to a preferred embodiment of the present invention;
FIG. 2 is an electrical schematic diagram of a motor drive module in accordance with a preferred embodiment of the present invention;
FIG. 3 is an electrical schematic diagram of a power sampling module in accordance with a preferred embodiment of the present invention;
FIG. 4 is an electrical schematic diagram of a discharge module in accordance with a preferred embodiment of the present invention;
fig. 5 is an electrical schematic diagram of the voltage step-down module according to the preferred embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In accordance with the above-mentioned problems occurring in the prior art, there is provided a motor driving circuit for preventing back electromotive force, as shown in fig. 1, comprising:
the first input end of the motor driving module 1 is connected with an external first input power supply 2, and the second input end of the motor driving module 1 is connected with the first output end of a main control module 3;
the input end of the voltage reduction module 4 is connected with the first input power supply 2, the output end of the voltage reduction module 4 is connected with the first input end of the main control module 3, and the voltage input by the input power supply is reduced through the voltage reduction module 4 and is supplied to the main control module 3;
the input end of the power supply sampling module 5 is connected with the first input power supply 2, the output end of the power supply sampling module 5 is connected with the second input end of the main control module 3, and the real-time voltage value of a reverse electromotive force generated when the motor driving module 1 stops running is collected through the power supply sampling module 5 and is output to the main control module 3;
a first input end of the discharging module 6 is connected with the first input power supply 2, and a second input end of the discharging module 6 is connected with the main control module 3;
the main control module 3 compares the real-time voltage value with a preset voltage value and controls the discharging module 6 to be turned on when the real-time voltage value is greater than the preset voltage value so as to reduce the real-time voltage value.
Specifically, in this embodiment, the first input power supply 2 is connected to the motor driving module 1 through the adapter, the voltage dropping module 4, the power sampling module 5 and the discharging module 6, when the motor driving module 1 stops operating, a certain back electromotive force is generated and flows back to the main control module 3 and the adapter, when the real-time voltage value of the back electromotive force reaches a certain value, the main control module 3 and the adapter may be damaged, and therefore the circuit compares the real-time voltage value of the back electromotive force with the preset voltage value through the main control module 3 in real time and controls the discharging module 6 to be turned on to reduce the real-time voltage value of the back electromotive force when the real-time voltage value is greater than the preset voltage value.
Preferably, the output terminal of the discharging module 6 is grounded, when the discharging module 6 is turned on, the potential of the ground terminal is 0, the connection point between the motor driving module 1 and the first input power supply 2 is a high potential, the back electromotive force flows from the high potential to a low potential, and the real-time voltage value of the back electromotive force is reduced by outputting the back electromotive force to the ground terminal through the discharging module 6.
In a preferred embodiment of the present invention, as shown in fig. 2, the motor driving module 1 includes:
a first POWER interface DC _ POWER + connected with the first input POWER 2;
a first field effect transistor Q1, a gate of the first field effect transistor Q1 is connected to the first output terminal of the main control module 3, a drain of the first field effect transistor Q1 is connected to the first POWER interface DC _ POWER +, and a source of the first field effect transistor Q1 is connected to one end of a MOTOR;
a second field effect transistor Q2, a gate of the second field effect transistor Q2 is connected to the first output terminal of the main control module 3, and a drain of the second field effect transistor Q2 is connected to one end of the MOTOR;
a third field effect transistor Q3, a gate of the third field effect transistor Q3 is connected to the first output end of the main control module 3, a drain of the third field effect transistor Q3 is connected to the first POWER interface DC _ POWER +, and a source of the third field effect transistor Q3 is connected to the other end of the MOTOR;
a fourth field effect transistor Q4, a gate of the fourth field effect transistor Q4 is connected to the first output terminal of the main control module 3, and a drain of the fourth field effect transistor Q4 is connected to the other end of the MOTOR;
one end of the first resistor R1 is connected to the source of the fourth field effect transistor Q4 and the source of the second field effect transistor Q2 respectively, and the other end of the first resistor R1 is grounded;
the first POWER interface DC _ POWER + is used as a first input end of the motor driving module 1, and the gate of the first field effect transistor Q1, the gate of the second field effect transistor Q2, the gate of the third field effect transistor Q3 and the gate of the fourth field effect transistor Q4 are used as a second input end of the motor driving module 1;
when the MOTOR is stopped, the MOTOR generates a reverse electromotive force and transmits the reverse electromotive force to the input end of the POWER sampling module 5 through the first POWER interface DC _ POWER +.
In a preferred embodiment of the present invention, one end of the MOTOR is connected to an anode port M +, the other end of the MOTOR is connected to a cathode port M-, and the MOTOR is connected to an external second input power source through the anode port M + and the cathode port M-to supply power to the MOTOR.
In a preferred embodiment of the present invention, the first fet Q1 and the fourth fet Q4 are forward rotation control fets of the MOTOR, and the main control module 3 outputs a first pulse width modulation signal to the gate of the first fet Q1 and the gate of the fourth fet Q4 to control the first fet Q1 and the fourth fet Q4 to be turned on, and controls the MOTOR to rotate forward through the first fet Q1 and the fourth fet Q4.
In a preferred embodiment of the present invention, the second fet Q2 and the third fet Q3 are inversion control fets of the MOTOR, and the main control module 3 outputs a second pulse width modulation signal to the gate of the second fet Q2 and the gate of the third fet Q3 to control the second fet Q2 and the third fet Q3 to be turned on, and controls the MOTOR to perform inversion through the second fet Q2 and the third fet Q3.
Specifically, in this embodiment, the output end of the main control module 3 includes four signal interfaces, namely a first signal interface PWM1, a second signal interface PWM2, a third signal interface PWM3 and a fourth signal interface PWM4, wherein the gate of the first fet Q1 is connected to the first signal interface PWM1 to receive the first pulse width modulation signal, the gate of the second fet Q2 is connected to the second signal interface PWM2 to receive the second pulse width modulation signal, the gate of the third fet Q3 is connected to the third signal interface PWM3 to receive the first pulse width modulation signal, and the gate of the fourth fet Q4 is connected to the fourth signal interface PWM4 to receive the second pulse width modulation signal.
In a preferred embodiment of the present invention, as shown in fig. 3, the power sampling module 5 includes:
a second POWER interface DC _ POWER + connected with the first input POWER supply 2;
one end of the second resistor R2 is connected with the second POWER interface DC _ POWER +;
one end of a third resistor R3, one end of a third resistor R3 is connected with the other end of the second resistor R2, and the other end of the third resistor R3 is grounded;
one end of the fourth resistor R4 is connected to the other end of the second resistor R2, and the other end of the fourth resistor R4 is connected to a first voltage output interface ADC _ POWER;
one end of the first capacitor C1 is connected to the other end of the fourth resistor R4, and the other end of the first capacitor C1 is grounded;
the second POWER interface DC _ POWER + is used as the input end of the POWER sampling module 5, and the first voltage output interface ADC _ POWER is used as the output end of the POWER sampling module 5;
the reverse electromotive force output by the motor driving module 1 is received through the second POWER interface DC _ POWER + and the real-time voltage value of the reverse electromotive force is output to the main control module 3 through the first voltage output interface ADC _ POWER +.
In a preferred embodiment of the present invention, as shown in fig. 4, the discharging module 6 includes:
a third POWER interface DC _ POWER + connected with the first input POWER supply 2;
a diode D1, wherein the cathode of the diode D1 is connected with the third POWER interface DC _ POWER +;
a fifth resistor R5, the fifth resistor R5 is connected in parallel to the two ends of the diode D1;
a triode Q5, wherein the collector of the triode Q5 is connected with the anode of the diode D1, and the emitter of the triode Q5 is grounded;
one end of the sixth resistor R6, one end of the sixth resistor R6 is connected with the base of the triode Q5, and the other end of the sixth resistor R6 is connected with the emitter of the triode Q5;
one end of the seventh resistor R7, one end of the seventh resistor R7 is connected with the base of the triode Q5, and the other end of the seventh resistor R7 is connected with a signal input interface IO;
the third POWER interface DC _ POWER + is used as a first input end of the discharging module 6, and the signal input interface IO is used as a second input end of the discharging module 6;
the main control module 3 outputs a control signal when the real-time voltage value is greater than the preset voltage value, receives the control signal through the signal input interface IO, and controls to turn on the transistor Q5 according to the control signal to reduce the real-time voltage value.
In a preferred embodiment of the present invention, as shown in fig. 5, the voltage reducing module 4 includes:
a fourth POWER interface DC _ POWER + connected with the first input POWER supply 2;
the anode of the first filter capacitor EC1 is connected with the fourth POWER interface DC _ POWER +;
a second capacitor C2 connected in parallel to two ends of the first filter capacitor EC1, wherein one end of the second capacitor C2 is connected to the fourth POWER interface DC _ POWER + and one end of the first filter capacitor EC1, and the other end of the second capacitor C2 is connected to the negative electrode of the first filter capacitor EC 1;
one end of an eighth resistor R8, one end of an eighth resistor R8 is connected with one end of the second capacitor C2 and the fifth pin of the buck chip U1, and the other end of the eighth resistor R8 is connected with the fourth pin of the buck chip U1;
one end of a ninth resistor R9, the second pin of the buck chip U1 is connected to one end of the ninth resistor R9, and the third pin of the buck chip U1 is connected to the other end of the ninth resistor R9;
one end of a third capacitor C3, one end of a third capacitor C3 is connected to the first pin of the buck chip U1, and one end of a third capacitor C3 is connected to the sixth pin of the buck chip U1;
one end of the inductor L1 is connected to the other end of the third capacitor C3;
one end of a tenth resistor R10, the other end of the inductor L1 is connected with one end of a tenth resistor R10, and the other end of the tenth resistor R10 is connected with a third pin of the buck chip U1;
a second filter capacitor EC2, the anode of the second filter capacitor EC2 is connected to the other end of the inductor L1 and a second voltage output interface VCC, respectively, and the cathode of the second filter capacitor EC2 is grounded;
a fourth capacitor C4 connected in parallel to two ends of the second filter capacitor EC2, wherein one end of the fourth capacitor C4 is connected to the anode of the second filter capacitor EC2 and the second voltage output interface VCC, and the other end of the fourth capacitor C4 is connected to the cathode of the second filter capacitor EC 2;
the fourth POWER input interface DC _ POWER + is used as an input end of the voltage-reducing module 4, and the second voltage output interface VCC is used as an output end of the voltage-reducing module 4;
the voltage of the first input POWER supply 2 input by the fourth POWER input interface DC _ POWER + is reduced by the voltage reduction chip U1 and is output to the main control module 3 via the second voltage output interface VCC to supply POWER to the main control module 3.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A back electromotive force prevention motor drive circuit characterized by comprising:
the first input end of the motor driving module is connected with an external first input power supply, and the second input end of the motor driving module is connected with the first output end of a main control module;
the input end of the voltage reduction module is connected with the first input power supply, the output end of the voltage reduction module is connected with the first input end of the main control module, and the voltage input by the first input power supply is reduced through the voltage reduction module and is supplied to the main control module;
the input end of the power supply sampling module is connected with the first input power supply, the output end of the power supply sampling module is connected with the second input end of the main control module, and the power supply sampling module is used for collecting a real-time voltage value of a reverse electromotive force generated when the motor driving module stops running and outputting the real-time voltage value to the main control module;
a first input end of the discharging module is connected with the first input power supply, and a second input end of the discharging module is connected with the main control module;
the main control module compares the real-time voltage value with a preset voltage value and controls the discharge module to be conducted to reduce the real-time voltage value when the real-time voltage value is larger than the preset voltage value.
2. The motor drive circuit according to claim 1, wherein the motor drive module comprises:
the first power interface is connected with the first input power supply;
the grid electrode of the first field effect transistor is connected with the first output end of the main control module, the drain electrode of the first field effect transistor is connected with the first power interface, and the source electrode of the first field effect transistor is connected with one end of a motor;
the grid electrode of the second field effect transistor is connected with the first output end of the main control module, and the drain electrode of the second field effect transistor is connected with one end of the motor;
a grid electrode of the third field effect transistor is connected with the first output end of the main control module, a drain electrode of the third field effect transistor is connected with the first power supply interface, and a source electrode of the third field effect transistor is connected with the other end of the motor;
a grid electrode of the fourth field effect transistor is connected with the first output end of the main control module, and a drain electrode of the fourth field effect transistor is connected with the other end of the motor;
one end of the first resistor is connected with the source electrode of the fourth field effect transistor and the source electrode of the second field effect transistor respectively, and the other end of the first resistor is grounded;
the first power interface is used as the first input end of the motor driving module, and the grid electrode of the first field effect transistor, the grid electrode of the second field effect transistor, the grid electrode of the third field effect transistor and the grid electrode of the fourth field effect transistor are used as the second input end of the motor driving module;
and when the motor stops, the motor generates the reverse electromotive force and transmits the reverse electromotive force to the input end of the power supply sampling module through the first power supply interface.
3. The motor driving circuit according to claim 2, wherein one end of the motor is connected to a positive terminal, and the other end of the motor is connected to a negative terminal, and the motor is powered by a second external input power source connected to the positive terminal and the negative terminal.
4. The motor driving circuit according to claim 2, wherein the first fet and the fourth fet are forward rotation fets, and the main control module outputs a first pulse width modulation signal to the gate of the first fet and the gate of the fourth fet to control the first fet and the fourth fet to be turned on, and controls the motor to rotate forward through the first fet and the fourth fet.
5. The motor driving circuit according to claim 2, wherein the second fet and the third fet are inverse fets, and the main control module outputs a second pulse width modulation signal to the gate of the second fet and the gate of the third fet to control the second fet and the third fet to be turned on, and controls the motor to perform inverse rotation through the second fet and the third fet.
6. The motor drive circuit of claim 1, wherein the power sampling module comprises:
the second power interface is connected with the first input power supply;
one end of the second resistor is connected with the second power interface;
one end of the third resistor is connected with the other end of the second resistor, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with the other end of the second resistor, and the other end of the fourth resistor is connected with a first voltage output interface;
one end of the first capacitor is connected with the other end of the fourth resistor, and the other end of the first capacitor is grounded;
the second power supply interface is used as the input end of the power supply sampling module, and the first voltage output interface is used as the output end of the power supply sampling module;
and the second power interface receives the reverse electromotive force output by the motor driving module and outputs the real-time voltage value of the reverse electromotive force to the main control module through the first voltage output interface.
7. The motor drive circuit according to claim 1, wherein the discharge module includes:
the third power interface is connected with the first input power supply;
a cathode of the diode is connected with the third power interface;
the fifth resistor is connected in parallel with two ends of the diode;
the collector of the triode is connected with the anode of the diode, and the emitter of the triode is grounded;
one end of the sixth resistor is connected with the base electrode of the triode, and the other end of the sixth resistor is connected with the emitting electrode of the triode;
one end of the seventh resistor is connected with the base electrode of the triode, and the other end of the seventh resistor is connected with a signal input interface;
the third power interface is used as the first input end of the discharging module, and the signal input interface is used as the second input end of the discharging module;
the main control module outputs a control signal when the real-time voltage value is larger than the preset voltage value, receives the control signal through the signal input interface and controls the triode to be opened according to the control signal so as to reduce the real-time voltage value.
8. The motor drive circuit of claim 1, wherein the voltage-reducing module comprises:
the fourth power interface is connected with the first input power supply;
the anode of the first filter capacitor is connected with the fourth power interface;
the second capacitor is connected in parallel to two ends of the first filter capacitor, one end of the second capacitor is respectively connected with the fourth power interface and one end of the first filter capacitor, and the other end of the second capacitor is connected with the negative electrode of the first filter capacitor;
one end of the eighth resistor is connected with one end of the second capacitor and the fifth pin of the voltage reduction chip respectively, and the other end of the eighth resistor is connected with the fourth pin of the voltage reduction chip;
one end of the ninth resistor is connected with the second pin of the voltage reduction chip, and the other end of the ninth resistor is connected with the third pin of the voltage reduction chip;
one end of the third capacitor is connected with the first pin of the voltage reduction chip, and one end of the third capacitor is connected with the sixth pin of the voltage reduction chip;
one end of the inductor is connected with the other end of the third capacitor;
one end of the tenth resistor is connected with the other end of the inductor, and the other end of the tenth resistor is connected with the third pin of the voltage reduction chip;
the positive electrode of the second filter capacitor is respectively connected with the other end of the inductor and a second voltage output interface, and the negative electrode of the second filter capacitor is grounded;
the fourth capacitor is connected in parallel to two ends of the second filter capacitor, one end of the fourth capacitor is respectively connected with the anode of the second filter capacitor and the second voltage output interface, and the other end of the fourth capacitor is connected with the cathode of the second filter capacitor;
the fourth power input interface is used as the input end of the voltage reduction module, and the second voltage output interface is used as the output end of the voltage reduction module;
and the voltage of the first input power supply input by the fourth power supply input interface is reduced by the voltage reduction chip and is output to the main control module through the second voltage output interface to supply power for the main control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210269935.4A CN114597882A (en) | 2022-03-18 | 2022-03-18 | Motor drive circuit for preventing reverse electromotive force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210269935.4A CN114597882A (en) | 2022-03-18 | 2022-03-18 | Motor drive circuit for preventing reverse electromotive force |
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| CN114597882A true CN114597882A (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210269935.4A Pending CN114597882A (en) | 2022-03-18 | 2022-03-18 | Motor drive circuit for preventing reverse electromotive force |
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