发明名称 |
Power adapter with voltage-stabilized compensation |
摘要 |
A power adapter with voltage-stabilized compensation includes a pulse frequency modulation circuit to generate a driving pulse which has a variable OFF time interval to control power transformed and output by a transformer. The power adapter also has an ancillary coil to induce a feedback signal on the secondary coil of the transformer. The pulse frequency modulation circuit includes a time interval modulation unit to receive the feedback signal and a feedback compensation unit. The time interval modulation unit sets a level voltage compared with the feedback signal to generate a sample signal to modulate the OFF time interval. The feedback compensation unit provides a compensation signal to the time interval modulation unit to change the size of the feedback signal or sample signal thereby to compensate the voltage output from the secondary side.
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申请公布号 |
US7864550(B2) |
申请公布日期 |
2011.01.04 |
申请号 |
US20080265535 |
申请日期 |
2008.11.05 |
申请人 |
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
发明人 |
DUAN JIAN-HUA;FEI RUI-XIA;FANG SHAO-HUA;SU QING-HUA |
分类号 |
H02M3/335 |
主分类号 |
H02M3/335 |
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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