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CN-224218306-U - Motor power-on protection circuit and robot

CN224218306UCN 224218306 UCN224218306 UCN 224218306UCN-224218306-U

Abstract

The application provides a motor power-on protection circuit and a robot. Relates to the technical field of power-on protection. The motor power-on protection circuit comprises a power-on slow-start module, a switch module and a control module, wherein the power-on slow-start module comprises a first switch unit and a positive temperature coefficient thermistor, the first switch unit and the positive temperature coefficient thermistor are connected in series between an output end of a power supply and a power supply end of a motor, the switch module is connected between the output end of the power supply and the power supply end of the motor, the control module is respectively connected with a control end of the first switch unit and a control end of the switch module, and the control module is used for controlling the first switch unit and the switch module to be sequentially conducted when the motor is powered on. The motor power-on protection circuit provided by the application has the advantages that the power-on slow-start module based on the positive temperature coefficient thermistor is added, so that the heavy current at the moment of power-on of the motor can be restrained, and the safety and reliability of the motor work are improved.

Inventors

  • WU CHANGZHENG
  • Sun Houlu

Assignees

  • 追觅创新科技(苏州)有限公司

Dates

Publication Date
20260508
Application Date
20250415

Claims (10)

  1. 1. A motor power-on protection circuit, comprising: The power-on slow-start module comprises a first switch unit and a positive temperature coefficient thermistor, wherein the first switch unit and the positive temperature coefficient thermistor are connected in series between the output end of a power supply and the power supply end of a motor; the switch module is connected between the output end of the power supply and the power supply end of the motor; The control module is respectively connected with the control end of the first switch unit and the control end of the switch module; the control module is used for controlling the first switch unit and the switch module to be conducted successively when the motor is electrified.
  2. 2. The motor power-on protection circuit of claim 1, wherein the first switching unit comprises: The first end of the first switch subunit is connected with the output end of the power supply, the second end of the first switch subunit is connected with the first end of the positive temperature coefficient thermistor, and the second end of the positive temperature coefficient thermistor is connected with the power supply end of the motor; The control terminal of the first control subunit is connected with the control terminal of the first switch subunit, the first input terminal of the first control subunit is connected with the output terminal of the power supply, the second input terminal of the first control subunit is grounded, and the output terminal of the first control subunit is connected with the control terminal of the first switch subunit.
  3. 3. The motor power-on protection circuit according to claim 2, wherein the first switching subunit comprises a first transistor, a first pole of the first transistor is connected to the output terminal of the power supply, a second pole of the first transistor is connected to the first terminal of the positive temperature coefficient thermistor, and a control pole of the first transistor is connected to the output terminal of the first control subunit; The first control subunit comprises a second transistor, a first resistor, a second resistor and a first capacitor, wherein the control electrode of the second transistor is connected with the control end of the first switch unit, the first electrode of the second transistor is grounded, the second electrode of the second transistor is connected with the first end of the first resistor, the second end of the first resistor is connected with the control electrode of the first transistor, and the second resistor and the first capacitor are connected between the first electrode and the control electrode of the first transistor in parallel; Or the first control subunit comprises a first gate driving chip, wherein the enabling end of the first gate driving chip is connected with the control end of the first switch unit, the input end of the first gate driving chip is connected with the output end of the power supply, the driving end of the first gate driving chip is connected with the control electrode of the first transistor, the grounding end of the first gate driving chip is grounded, and the output end of the first gate driving chip is connected with the second electrode of the first transistor.
  4. 4. The motor power-on protection circuit according to claim 3, wherein the first transistor is a MOS transistor; the first switch unit further comprises a third resistor, a second capacitor and a third capacitor, wherein the third resistor is connected between the control end of the first control subunit and the control end of the first switch unit, and the second capacitor and the third capacitor are connected between the output end of the power supply and the ground in parallel.
  5. 5. The power-on protection circuit of claim 1, wherein the switching module comprises a second switching unit and a fuse connected in series between an output terminal of the power supply and a power supply terminal of the motor.
  6. 6. The motor power-on protection circuit of claim 5, wherein the second switching unit comprises: The first end of the second switch subunit is connected with the output end of the power supply, the second end of the second switch subunit is connected with the first end of the fuse, and the second end of the fuse is connected with the power supply end of the motor; The control end of the second control subunit is connected with the control end of the second switch unit, the first input end of the second control subunit is connected with the output end of the power supply, the second input end of the second control subunit is grounded, and the output end of the second control subunit is connected with the control end of the second switch subunit.
  7. 7. The motor power-on protection circuit according to claim 6, wherein the second switching subunit includes a third transistor, a first pole of the third transistor is connected to the output terminal of the power supply, a second pole of the third transistor is connected to the first terminal of the fuse, and a control pole of the third transistor is connected to the output terminal of the second control subunit; The second control subunit comprises a fourth transistor, a fourth resistor, a fifth resistor and a fourth capacitor, wherein the control electrode of the fourth transistor is connected with the control end of the second switch unit, the first electrode of the fourth transistor is grounded, the second electrode of the fourth transistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the control electrode of the third transistor, and the fifth resistor and the fourth capacitor are connected between the first electrode and the control electrode of the third transistor in parallel; Or the second control subunit comprises a second gate driving chip, wherein the enabling end of the second gate driving chip is connected with the control end of the second switch unit, the input end of the second gate driving chip is connected with the output end of the power supply, the driving end of the second gate driving chip is connected with the control electrode of the third transistor, the grounding end of the second gate driving chip is grounded, and the output end of the second gate driving chip is connected with the second electrode of the third transistor.
  8. 8. The motor power-on protection circuit of claim 7, wherein the third transistor is a MOS transistor; The first switch unit further comprises a sixth resistor, a fifth capacitor and a sixth capacitor, wherein the sixth resistor is connected between the control end of the second control subunit and the control end of the second switch unit, and the fifth capacitor and the sixth capacitor are connected between the output end of the power supply and the ground in parallel.
  9. 9. The motor power-on protection circuit of claim 1, wherein the control module comprises a microprocessor.
  10. 10. A robot comprising a motor and the motor power-on protection circuit according to any one of claims 1 to 9.

Description

Motor power-on protection circuit and robot Technical Field The application relates to the technical field of power-on protection, in particular to a motor power-on protection circuit and a robot. Background The motion joint of the robot can use a plurality of motors, the current at the moment of powering on the motors is large, and particularly under the condition that a plurality of motors are powered on simultaneously, the service life and the reliability of the device can be seriously influenced by the large current at the moment of powering on. For example, using a MOSFET switching scheme, the high current at power-up transients may exceed the limits of the MOSFET electrical parameters, thereby damaging the MOSFET. Or a relay scheme is used, the problem of high current at the moment of power-on is not solved, the service lives of the relay and related circuit components are also influenced, the volume of the relay is generally larger than that of the MOSFET, the price is higher, and the relay can also produce the sound of relay attraction in use. Therefore, in the related art, the operation safety and reliability of the motor are affected by the instantaneous high current when the motor is powered on. Disclosure of utility model The application provides a motor power-on protection circuit and a robot, which are used for inhibiting large current at the moment of motor power-on, so that the safety and reliability of motor work are improved. In one aspect, the present application provides a power-on protection circuit for a motor, comprising: The power-on slow-start module comprises a first switch unit and a positive temperature coefficient thermistor, wherein the first switch unit and the positive temperature coefficient thermistor are connected in series between the output end of a power supply and the power supply end of a motor; the switch module is connected between the output end of the power supply and the power supply end of the motor; The control module is respectively connected with the control end of the first switch unit and the control end of the switch module; the control module is used for controlling the first switch unit and the switch module to be conducted successively when the motor is electrified. In the motor power-on protection circuit, based on the characteristic that the resistance value of the positive temperature coefficient thermistor is positively correlated with the temperature and the characteristic that the resistive element heats when the current flows, when the motor is powered on, the control module firstly controls the first switch unit to be conducted and then controls the switch module to be conducted, so that the power supply firstly supplies power to the motor through the current limitation of the positive temperature coefficient thermistor, thereby inhibiting the heavy current at the moment of the motor power-on and improving the safety and reliability of the motor. Optionally, the first switching unit includes: The first end of the first switch subunit is connected with the output end of the power supply, the second end of the first switch subunit is connected with the first end of the positive temperature coefficient thermistor, and the second end of the positive temperature coefficient thermistor is connected with the power supply end of the motor; The control terminal of the first control subunit is connected with the control terminal of the first switch subunit, the first input terminal of the first control subunit is connected with the output terminal of the power supply, the second input terminal of the first control subunit is grounded, and the output terminal of the first control subunit is connected with the control terminal of the first switch subunit. By means of the arrangement, on-off driving control of the first switch subunit can be achieved through the first control subunit, control flexibility of the first switch subunit is improved, and the type selection range of the switch devices in the first switch subunit is widened. Optionally, the first switch subunit comprises a first transistor, a second transistor and a first switch subunit, wherein a first pole of the first transistor is connected with the output end of the power supply, a second pole of the first transistor is connected with the first end of the positive temperature coefficient thermistor, and a control pole of the first transistor is connected with the output end of the first control subunit; The first control subunit comprises a second transistor, a first resistor, a second resistor and a first capacitor, wherein the control electrode of the second transistor is connected with the control end of the first switch unit, the first electrode of the second transistor is grounded, the second electrode of the second transistor is connected with the first end of the first resistor, the second end of the first resistor is connected with the control electrode of the first transistor, and the