CONTROLLER FOR DC BRUSHLESS MOTOR INTEGRATED WITH A HIGH VOLTAGE CONTROL SYSTEM

• US 20080050100A1
• Filed: 06/17/2007
• Published: 02/28/2008
• Est. Priority Date: 08/28/2006
• Status: Active Grant

• Current Assignee: Zhongshan Broad-Ocean Motor Company Limited
• Original Assignee: Zhongshan Broad-Ocean Motor Company Limited
• Inventors: Peng, Aiqiang, Zeng, Maosen
• Granted Patent: US 7,675,256 B2
• Time in Patent Office: Days
• US Class Current: 388/804
• CPC Class Codes: H02P 2201/07 DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed general aspects of plural converters in cascade H02M
• CPC Class Codes: H02P 6/34 Modelling or simulation for control purposes

Abstract

Taught herein is a controller for a direct current brushless motor connected to a high voltage control system, comprising a microprocessor and an input/output interface circuit connected between the high voltage control system and the microprocessor; wherein the input/output interface circuit is a step-down circuit for transforming a high voltage control signal into a low-voltage control signal. The controller enables the high voltage control system to cooperate with motor, therefore a user is not necessary to design a new high voltage control system when replacing the conventional AC motor with the DC brushless motor, which saves time, and reduces cost.

Claims

1. A controller for a direct current brushless motor connected to a high voltage control system, comprising

a microprocessor;

and

an input/output interface circuit connected between said high voltage control system and said microprocessor;

wherein

said input/output interface circuit is a step-down circuit for transforming a high voltage control signal into a low-voltage control signal.

2. The controller of claim 1, wherein said input/output interface circuit is a step-down rectifying circuit for transforming a high voltage alternating current control signal into a low-voltage direct-current control signal.

3. The controller of claim 1, wherein said step-down rectifying circuit comprises a photoelectric isolation means.

4. The controller of claim 3, wherein said step-down rectifying circuit with said photoelectric isolation means is a resistance-type step-down circuit.

5. The controller of claim 3, wherein said step-down rectifying circuit with said photoelectric isolation means is a capacitance-type step-down circuit.

6. The controller of claim 2, wherein said step-down circuit is a resistance-type step-down circuit.

7. The controller of claim 2, wherein said step-down circuit is a capacitance-type step-down circuit.

8. The controller of claim 1, further comprising an integrated power module for driving the direct current brushless motor.

9. The controller of claim 8, wherein an output end of said microprocessor is connected to an input end of said integrated power module.

10. The controller of claim 1, wherein the motor comprises a stator having a winding and a permanent magnetic rotor magnetically coupled to said stator.

11. The controller of claim 10, wherein an output end of said integrated power module is connected to a winding of said stator.

12. The controller of claim 10, further comprising a rotor position sensing circuit for sensing a location of said permanent magnetic rotor.

13. The controller of claim 12, wherein an input end of said rotor position sensing circuit is connected to an output end of said integrated power module.

14. The controller claim 13, wherein an output end of said rotor position sensing circuit is connected to an input end of said microprocessor.

15. The controller of claim 12, further comprising a current-sensing circuit for sensing current flowing through the motor.

16. The controller of claim 15, wherein an input end of said current-sensing circuit is connected to an output end of the integrated power module.

17. The controller of claim 16, wherein an output end of the current-sensing circuit is connected to an input end of said microprocessor.

18. The controller of claim 1, further comprising a power source circuit for supplying power to said microprocessor (22), said integrated power module (21), said input/output interface circuit (25), said current-sensing circuit (26), and said rotor position sensing circuit (23).

19. A controller for a direct current brushless motor connected to a high voltage control system, comprising

a microprocessor;

and

an input/output interface circuit connected between said high voltage control system and said microprocessor;

wherein

said input/output interface circuit is substantially the same as a circuit illustrated in FIG. 2, FIG. 3, or FIG. 4.