发明申请
- 专利标题: Fan speed control circuit
- 专利标题(中): 风扇转速控制电路
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申请号: US11270494申请日: 2005-11-10
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公开(公告)号: US20060056823A1公开(公告)日: 2006-03-16
- 发明人: Chia-Feng Wu , Yueh-Lung Huang , Ming-Shi Tsai , Wen-Shi Huang
- 申请人: Chia-Feng Wu , Yueh-Lung Huang , Ming-Shi Tsai , Wen-Shi Huang
- 专利权人: DELTA ELECTRONICS, INC.
- 当前专利权人: DELTA ELECTRONICS, INC.
- 优先权: TW92118358 20030704; TW94127413 20050812
- 主分类号: H02P7/29
- IPC分类号: H02P7/29
摘要:
A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and the driving circuit outputs a driving signal according to the PWM control signal to a fan motor. The phase compensation unit is connected to the fan motor for delaying or advancing the PWM control signal by a phase angle to synchronize the acting period of the back electromotive force formed by the magnetic flux variation with the off-time of the PWM control signal. The present invention further provides a bi-power motor driving system including a motor rotating by receiving a first power from a first power generator, and a driving circuit for driving the motor according to a second power from a second power generator.
公开/授权文献
- US07233121B2 Fan speed control circuit 公开/授权日:2007-06-19