发明申请
- 专利标题： Control circuit of synchronous rectification type power supply unit, synchronous rectification type power supply unit and control method thereof
- 专利标题（中）： 同步整流式电源装置的控制电路，同步整流式电源装置及其控制方法
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申请号： US11902706申请日： 2007-09-25
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公开(公告)号： US20080079408A1公开(公告)日： 2008-04-03
- 发明人: Morihito Hasegawa , Hidekiyo Ozawa
- 申请人： Morihito Hasegawa , Hidekiyo Ozawa
- 专利权人： FUJITSU LIMITED
- 当前专利权人： FUJITSU LIMITED
- 优先权： JP2006-263987 20060928
- 主分类号： G05F1/44
- IPC分类号： G05F1/44 ; G05F1/00
摘要：
The control circuit comprises: a detecting portion COMP1 for detecting a status transition of a first signal FR at the connecting point P which changes at a constant cycle corresponding to current flowing through the antiparallel diode D when the main switch device FET is turned OFF; and a phase difference adjusting portion 30, 40 for adjusting the phase difference by adjusting the output timing of the second signal FP corresponding to a phase difference between the phase of the first signal FR detected by the detecting portion COMP1 and the phase of the second signal FP generated based on the first signal of one cycle before and the rectification switch device FET2 is turned ON corresponding to the second signal FP whose output timing is adjusted by the phase difference adjusting portion 30, 40.