发明名称 |
Switching power source apparatus and power factor corrector |
摘要 |
A power factor corrector is connected to an AC power source, to provide a first DC voltage. A DC-DC converter supplies the first DC voltage from the power factor corrector to a primary winding of a transformer. A first rectifying/smoothing circuit rectifies and smoothes a voltage generated by a secondary winding of the transformer and supplies the rectified-and-smoothed voltage to a load. A second rectifying/smoothing circuit rectifies and smoothes a voltage generated by a control winding of the transformer. A light-load detector detects if an output ripple of the second rectifying/smoothing circuit is equal to or greater than a predetermined value, determines upon detection that the switching operation has decreased the frequency thereof or has shifted to an intermittent oscillation, and stops the power factor corrector.
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申请公布号 |
US2005269997(A1) |
申请公布日期 |
2005.12.08 |
申请号 |
US20050143026 |
申请日期 |
2005.05.31 |
申请人 |
USUI HIROSHI;OSAKA SYOHEI |
发明人 |
USUI HIROSHI;OSAKA SYOHEI |
分类号 |
H02M7/12;H02M1/42;H02M3/28;H02M3/335;H02M5/42;(IPC1-7):H02M5/42 |
主分类号 |
H02M7/12 |
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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