发明授权
- 专利标题： Synchronous rectification controlling circuit and synchronous rectification controlling method
- 专利标题（中）： 同步整流控制电路和同步整流控制方法
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申请号： US14268944申请日： 2014-05-02
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公开(公告)号： US09312785B2公开(公告)日： 2016-04-12
- 发明人: Lingdong Zhang
- 申请人： Silergy Semiconductor Technology (Hangzhou) LTD
- 申请人地址： CN Hangzhou
- 专利权人： Silergy Semiconductor Technology (Hangzhou) LTD
- 当前专利权人： Silergy Semiconductor Technology (Hangzhou) LTD
- 当前专利权人地址： CN Hangzhou
- 代理商 Michael C. Stephens, Jr.
- 优先权： CN201310138826 20130510
- 主分类号： H02M7/68
- IPC分类号： H02M7/68 ; H02M7/217 ; H02M1/42 ; H05B33/08 ; H02M1/00
摘要：
In one embodiment, a synchronous rectification circuit can include: (i) a sampling circuit configured to sample a voltage across first and second power terminals of a synchronous rectifier, and to generate a first sampling voltage; (ii) an enable controlling circuit configured to delay the first sampling voltage, and to generate a second sampling voltage, and to activate a ramp voltage when the first sampling voltage is higher than the second sampling voltage; (iii) the enable controlling circuit being configured to generate an enable controlling signal in response to a comparison of the ramp voltage against a reference voltage that represents a predetermined light load condition; and (iv) a driving circuit configured to activate a driving signal to turn on the synchronous rectifier when the enable controlling signal and a synchronous rectification open signal are active.
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