发明名称 |
Circuits and methods for driving light sources |
摘要 |
A circuit for driving a light-emitting diode (LED) light source includes a converter, a saw-tooth signal generator, and a controller. The converter includes a switch which is controlled by a driving signal. The converter provides a sense signal indicating the current through said LED light source. The saw-tooth signal generator generates a saw-tooth signal based on the driving signal. The controller generates the driving signal based on signals including the saw-tooth signal and the first sense signal to adjust the current through the LED light source to a target level and to correct a power factor of the driving circuit by controlling an average current of the input current to be substantially in phase with said input voltage. |
申请公布号 |
US8698419(B2) |
申请公布日期 |
2014.04.15 |
申请号 |
US201213371351 |
申请日期 |
2012.02.10 |
申请人 |
YAN TIESHENG;KUO CHING-CHUAN;LIN FENG;XU JIANPING;O2MICRO, INC. |
发明人 |
YAN TIESHENG;KUO CHING-CHUAN;LIN FENG;XU JIANPING |
分类号 |
G05F1/00;H05B37/02;H05B39/04;H05B41/282;H05B41/36 |
主分类号 |
G05F1/00 |
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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