发明名称 |
Fan motor speed control circuit |
摘要 |
A fan motor speed control circuit includes a driving circuit, a voltage division circuit, and a speed modulator. The voltage division circuit has a first transistor and a plurality of resistors and is connected between a voltage source and the driving circuit. The speed modulator has a second transistor and a plurality of parallel resistors and is connected between the voltage division circuit and the driving circuit. The current of the fan motor speed control circuit flows through a first path under a first input voltage generated from the voltage source and through a second path under a second input voltage larger than the first one; the parallel resistors are in the second path such that the current value passing through the driving circuit varies according to the resulting resistance value of the parallel resistors.
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申请公布号 |
US2005040778(A1) |
申请公布日期 |
2005.02.24 |
申请号 |
US20040861719 |
申请日期 |
2004.06.04 |
申请人 |
LIN YU-LIANG;HUANG YUEH-LUNG;LEI TSUNG-YU;HSIEH JU-WEN;HUANG WEN-SHI |
发明人 |
LIN YU-LIANG;HUANG YUEH-LUNG;LEI TSUNG-YU;HSIEH JU-WEN;HUANG WEN-SHI |
分类号 |
H02P6/08;H02P6/00;H02P7/00;(IPC1-7):H02P7/00 |
主分类号 |
H02P6/08 |
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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