发明名称 |
Motor control circuit |
摘要 |
A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a square wave with a sequence of alternating on-time and off-time. The waveform-shaping circuit adjusts the rise-time and the fall-time of the square wave to be both within a range of 5% to 15% of the square wave period, and the driving circuit outputs a driving signal to a fan motor according to the adjusted square wave.
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申请公布号 |
US2007160354(A1) |
申请公布日期 |
2007.07.12 |
申请号 |
US20070703183 |
申请日期 |
2007.02.07 |
申请人 |
WU CHIA-FENG;HSIEH CHING-SEN;HUANG YUEH-LUNG;TSAI MING-SHI |
发明人 |
WU CHIA-FENG;HSIEH CHING-SEN;HUANG YUEH-LUNG;TSAI MING-SHI |
分类号 |
H02P7/29;H02P25/04;H02P27/08 |
主分类号 |
H02P7/29 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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