发明名称 |
Switch mode power supply systems |
摘要 |
This invention relates to methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing. We describe a module which senses a current in a primary winding of a transformer and a voltage on a primary or auxiliary winding of the transformer, and which includes a multiplier coupled to an output of a signal averager averaging a primary winding current and to an output of a timing signal generator using the sensed voltage to signal when a secondary winding is powering an output of the SMPS, to multiply an averaged current sense signal by a fraction of a total cycle period of said SMPS during which the secondary winding is providing power to provide a signal estimating an output current of the SMPS.
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申请公布号 |
US7583519(B2) |
申请公布日期 |
2009.09.01 |
申请号 |
US20080017729 |
申请日期 |
2008.01.22 |
申请人 |
CAMBRIDGE SEMICONDUCTOR LIMITED |
发明人 |
PIPER JOHAN;GARNER DAVID M.;COULSON DAVID ROBERT |
分类号 |
H02M3/335;H02M7/5395 |
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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