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

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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The objects and advantages of the invention will become more readily apparent after reading the ensuing descriptions of the non-limiting illustrative embodiment and viewing the accompanying drawings, in which

FIG. 1 is a block circuit diagram of the controller of a direct current brushless motor according to one embodiment of the invention;

FIG. 2 is a circuit diagram of the input/output circuit according to one embodiment of the invention;

FIG. 3 is a circuit diagram of an input/output circuit according to another embodiment of the invention; and

FIG. 4 is a circuit diagram of an input/output circuit according to yet another embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIG. 1, a controller 2 for a direct current (DC) brushless motor is connected to a high voltage control system 3, and comprises an integrated power module 21, a microprocessor 22, a rotor position sensing circuit 23, a power source circuit 24, an input/output (input/output) interface circuit 25, and a current-sensing circuit 26.

In addition to the controller 2, the motor also comprises a stator and a permanent magnetic rotor magnetically coupled to the stator.

The integrated power module 21 has the function of driving the motor. An output end of the integrated power module 21 is connected to a winding 102 within the stator.

The integrated power module 21 comprises a gate drive circuit 210, an H-bridge inverter 212, and a temperature-protection circuit 214.

An output end of the microprocessor 22 is connected to an input end of the integrated power module 21.

The rotor position sensing circuit 23 has the function of sensing a location of the permanent magnetic rotor. An output end of the rotor position sensing circuit 23 is connected to an input end of the microprocessor 22. An input end of the rotor position sensing circuit 23 is connected to an output end of the integrated power module 21, or is connected to the detector serving to detect the position of the permanent magnet rotor.

The power source circuit 24 has the function of supplying power to all parts of the controller 2. An input end of the power source circuit 24 is connected to an external power supply.

An input end of the input/output interface circuit 25 is connected to the high voltage control system 3, and an output end thereof is connected to an input end of the microprocessor 22. The input/output interface circuit 25 is a step-down rectifying circuit for transforming a high voltage control signal into a low-voltage control signal.

The current-sensing circuit 26 has the function of sensing current flowing through the motor. An output end of the current-sensing circuit 26 is connected to an input end of the microprocessor 22. An input end of the current-sensing circuit 26 is connected to an output end of integrated power module 21.

As shown in FIG. 2, the input/output interface circuit 25 is a resistance-type step-down circuit. Five high voltage control signals CON1 consecutively through CON5 generated by the high voltage control system 3 are transmitted to the microprocessor 22 via the resistance-type step-down circuit. Five high voltage control signals CON1 consecutively through CON5 is transformed into five low voltage direct current control signal consecutively by the resistance-type step-down circuit. The microprocessor 22 controls the motor to operate according to the five low voltage direct current control signal consecutively.

As shown in FIG. 3, the input/output interface circuit 25 is in other embodiment a capacitance-type step-down circuit.

As shown in FIG. 4, the input/output interface circuit 25 in other embodiment comprises a photoelectric isolation means 4. The input/output interface circuit 25 with the photoelectric isolation means is a resistance-type step-down circuit, or a capacitance-type step-down circuit.

While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Claims

1. A controller for a direct current brushless motor connected to a high voltage control system, comprising a microprocessor; andan input/output interface circuit connected between said high voltage control system and said microprocessor;

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