Circuit Protection Method and Motor Control Circuit

• US 20130099709A1
• Filed: 12/13/2011
• Published: 04/25/2013
• Est. Priority Date: 10/19/2011
• Status: Abandoned Application

• Current Assignee: Anpec Electronics Corporation
• Original Assignee: Anpec Electronics Corporation
• Inventors: Tsai, Ming-Jung, Chen, Kun-Min, Li, Ching-Sheng
• Application Number:
  US13/323,829
• Publication Number:
  US 20130099709A1
• Time in Patent Office: Days
• US Class Current: 318/434
• CPC Class Codes: H02P 7/29 using pulse modulation

Abstract

A circuit protection method for a motor control circuit includes determining whether the motor control circuit complies with an operating condition when the motor control circuit is in a start mode, a lock mode or a restart mode, and modulating a current outputted from the motor control circuit when the motor control circuit complies with the operating condition.

Claims

1. A circuit protection method for a motor control circuit, the circuit protection method comprising:

determining whether the motor control circuit complies with an operating condition when the motor control circuit is in a start mode, a lock mode or a restart mode; and

modulating a current outputted from the motor control circuit when the motor control circuit complies with the operating condition.

2. The circuit protection method of claim 1, wherein the operating condition is the current outputted from the motor control circuit is larger than a predetermined value.

3. The circuit protection method of claim 2, further comprising modulating the current outputted from the motor control circuit to prevent the current from being larger than the predetermined value.

4. The circuit protection method of claim 1, wherein the operating condition is within a predetermined period after the motor control circuit initiates.

5. The circuit protection method of claim 1, wherein the motor control circuit comprises a detect circuit, the detect circuit comprising:

a reference current generating module, for generating a predetermined value;

a compare module, for comparing the current with the predetermined value to generate a comparison result; and

a control module, for generating a control signal to a bridge circuit according to the comparison result.

6. The circuit protection method of claim 5, further comprising receiving a partial energy from a pulse width modulation source by the control module according to the comparison result.

7. The circuit protection method of claim 5, wherein the bridge circuit comprises an up-bridge circuit and a down-bridge circuit turned on or off according to the control signal, so as to modulate the current outputted from the motor control circuit.

8. The circuit protection method of claim 7, wherein the up-bridge circuit comprises an input port coupled to a power supply, an output port and a controlled port for connecting a voltage source received by the input port with the output port according to the control signal outputted from the control module;

and the down-bridge circuit of the bridge circuit comprises an input port coupled to the output port of the up-bridge circuit, an output port coupled to the ground, and a controlled port for connecting a voltage source received by the input port with the output port according to the control signal outputted from the control module.

9. The circuit protection method of claim 8, wherein the motor is coupled between the output port of the up-bridge circuit and the output port of the down-bridge circuit.

10. The circuit protection method of claim 9, further comprising modulating the current passing through the motor when the motor is in the start mode, the lock mode or the restart mode.

11. A motor control circuit for determining whether the motor control circuit complies with an operating condition when the motor control circuit is in a start mode, a lock mode or a restart mode, comprising:

a detect circuit coupled to a motor, for detecting a current outputted from the motor control circuit and modulating a current outputted from the motor control circuit when the motor control circuit complies with the operating condition;

a bridge circuit coupled to an output port of the detect circuit; and

a pulse width modulation source coupled to an input port of the detect circuit.

12. The motor control circuit of claim 11, wherein the operating condition is the current outputted from the motor control circuit is larger than a predetermined value.

13. The motor control circuit of claim 12, wherein the pulse width modulation source modulates the current outputted from the motor control circuit to prevent the current from being larger than the predetermined value.

14. The motor control circuit of claim 11, wherein the operating condition is within a predetermined period after the motor control circuit initiates.

15. The motor control circuit of claim 11, wherein the detect circuit further comprises:

a reference current generating module, for generating a predetermined value;

a compare module, for comparing the current with the predetermined value to generate a comparison result; and

a control module, for generating a control signal to a bridge circuit according to the comparison result.

16. The motor control circuit of claim 15, wherein the control module receives a partial energy from the pulse width modulation source according to the comparison result.

17. The motor control circuit of claim 15, wherein the bridge circuit comprises an up-bridge circuit and a down-bridge circuit turned on or off according to the control signal, so as to modulate the current outputted from the motor control circuit.

18. The motor control circuit of claim 17, wherein the up-bridge circuit comprises an input port coupled to a power supply, an output port and a controlled port for connecting a voltage source received by the input port with the output port according to the control signal outputted from the control module;

and the down-bridge circuit of the bridge circuit comprises an input port coupled to the output port of the up-bridge circuit, an output port coupled to the ground, and a controlled port for connecting a voltage source received by the input port with the output port according to the control signal outputted from the control module.

19. The motor control circuit of claim 18, wherein the motor is coupled between the output port of the up-bridge circuit and the output port of the down-bridge circuit.

20. The motor control circuit of claim 18, wherein the pulse width modulation source modulates the current passing through the motor when the motor is in the start mode, the lock mode or the restart mode.