Fan motor control method and device thereof

• US 20070274694A1
• Filed: 02/26/2007
• Published: 11/29/2007
• Est. Priority Date: 03/31/2006
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Huang, Wen-Shi, Tsai, Ming-Shi, Huang, Yueh-Lung, Wu, Chia-Feng
• Granted Patent: US 7,545,112 B2
• Time in Patent Office: Days
• US Class Current: 388/811
• CPC Class Codes: H02P 7/285 controlling armature supply only

Abstract

A fan motor control device comprises a clock signal generator and a drive unit. The clock signal generator generates a low-frequency clock signal. A frequency of low-frequency clock signal is less than 23 KHz. The drive unit converts the low-frequency clock signal to a high-frequency drive signal and outputs the high-frequency drive signal to drive the fan motor. A frequency of the high-frequency drive signal is higher than 23 KHz.

Claims

1. A fan motor control method comprising steps of:

generating a low-frequency clock signal with a frequency of less than 23 KHz;

converting the low-frequency clock signal to a high-frequency drive signal, wherein the high-frequency drive signal has a frequency of higher than 23 KHz; and

inputting the high-frequency drive signal to a fan motor to drive the fan motor.

2. The fan motor control method as claimed in claim 1, wherein the frequency of the high-frequency drive signal is higher than 23 KHz and less than 30 KHz.

3. The fan motor control method as claimed in claim 1, wherein the low-frequency clock signal and the high-frequency drive signal are pulse width modulation (PWM) signals.

4. The fan motor control method as claimed in claim 1, wherein the low-frequency clock signal is converted to the high-frequency drive signal by an integrated circuit.

5. The fan motor control method as claimed in claim 4, wherein the low-frequency clock signal is converted from analog to digital to be input to the integrated circuit.

6. The fan motor control method as claimed in claim 5, wherein the converted low-frequency clock signal is amplified and converted from digital to analog in the integrated circuit, and then output by the integrated circuit to be as the high-frequency drive signal.

7. A fan motor control device comprising:

a clock signal generator generating a low-frequency clock signal with a frequency of low-frequency clock signal is less than 23 KHz; and

a drive unit converting the low-frequency clock signal to a high-frequency drive signal and outputting the high-frequency drive signal to drive the fan motor, wherein the high-frequency drive signal has a frequency of higher than 23 KHz.

8. The fan motor control device as claimed in claim 7, wherein the frequency of the high-frequency drive signal is higher than 23 KHz and less than 30 KHz.

9. The fan motor control device as claimed in claim 7, wherein the low-frequency clock signal and the high-frequency drive signal are pulse width modulation (PWM) signals.

10. The fan motor control device as claimed in claim 7, further comprises a digital-to-analog converter converting the low-frequency clock signal to an analog signal.

11. The fan motor control device as claimed in claim 10, wherein the digital-to-analog converter comprises:

a diode receiving the low-frequency clock signal;

a capacitor having a first terminal coupled to the diode and the drive unit, and a second terminal coupled to a ground; and

a resistor having a first terminal coupled to the diode and the drive unit, and a second terminal coupled to the ground.

12. The fan motor control device as claimed in claim 10, wherein the drive unit comprises an amplifier for amplifying the analog signal.

13. The fan motor control device as claimed in claim 12 wherein the drive unit further comprises an analog-to-digital converter for converting the analog signal to a digital signal and outputting the digital signal to the fan motor.

14. The fan motor control device as claimed in claim 12, wherein the drive unit further comprises a frequency converter for increasing a frequency of the analog signal.

15. The fan motor control device as claimed in claim 7, wherein the drive unit is implemented by a processor, an integrated circuit, or a programmable single chip.

16. A fan motor control device comprising:

a digital-to-analog converter receiving an external low-frequency clock signal and converting the external low-frequency clock signal to an analog signal; and

a drive unit converting the analog signal to a high-frequency drive signal and outputting the high-frequency drive signal to drive the fan motor, wherein the high-frequency drive signal has a frequency of greater than 23 KHz.

17. The fan motor control device as claimed in claim 16, wherein the frequency of the high-frequency drive signal is higher than 23 KHz and less than 30 KHz.

18. The fan motor control device as claimed in claim 16, wherein the high-frequency drive signal is pulse width modulation (PWM) signal.

19. The fan motor control device as claimed in claim 16, wherein the drive unit is a processor, an integrated circuit, or a programmable single chip.

20. The fan motor control device as claimed in claim 16, wherein the digital-to-analog converter comprises:

a diode receiving the low-frequency clock signal;

a capacitor having a first terminal coupled to the diode and the drive unit, and a second terminal coupled to a ground; and

a resistor having a first terminal coupled to the diode and the drive unit, and a second terminal coupled to the ground.