发明名称 |
Integrated start-up circuit with reduced power consumption |
摘要 |
A switching power supply control-circuit according to the present invention uses bleeding resistors to charge a start-up capacitor and discharge an EMI filter. No extra discharge device is needed to accelerate the discharge of the input capacitor, since the start-up capacitor is charged up by the AC input source. A latch circuit of the power supply can be quickly reset after the AC input source is shut off. After the control-circuit begins to operate, the auxiliary winding of the transformer will power the control-circuit. To further reduce power consumption, the auxiliary winding generates a bias voltage to enable line-voltage detection. This allows the power supply to perform line-voltage detection and startup, without having to connect resistors or transistors to the input capacitor.
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申请公布号 |
US2005052886(A1) |
申请公布日期 |
2005.03.10 |
申请号 |
US20030655899 |
申请日期 |
2003.09.04 |
申请人 |
YANG TA-YUNG;LIN SONG-YI;LIN CHIEN YUAN |
发明人 |
YANG TA-YUNG;LIN SONG-YI;LIN CHIEN YUAN |
分类号 |
H02M1/00;H02M1/36;H02M1/44;H02M3/156;(IPC1-7):H02M1/00 |
主分类号 |
H02M1/00 |
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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