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专利名称：SELF-DRIVEN SYNCHRONOUS
RECTIFICATION CIRCUIT FOR LOW OUTPUTVOLTAGE DC-DC CONVERTERS
发明人：XIA, Gang申请号：EP019019.5申请日：20010110公开号：EP1247326A2公开日：20021009
摘要：A synchronous rectification circuit for a DC-DC power converter can operateefficiently with a primary drive voltage that remains at a zero voltage level during aportion of the power conduction cycle. The DC-DC power converter includes a primaryside power circuit providing a symmetrically varying power signal that remains at a zerovoltage level for a portion of a conduction cycle. A first secondary side power circuit isinductively coupled to the primary side power circuit, and has an output terminal thatprovides an output voltage. The first secondary side power circuit further comprises firstand second synchronous rectifiers having respective activation terminals. The
synchronous rectifiers are adapted to alternately activate in synchronism with non-zerovoltage level portions of the conduction cycle. A second secondary side power circuit isinductively coupled to the first secondary side power circuit and has polarity reversedwith respect to the first secondary side power circuit. The second secondary side powercircuit comprises first and second switching devices having respective activation terminalsrespectively coupled to the activation terminals of the first and second synchronousrectifiers. The first and second switching devices are adapted to alternately activate in
inverse synchronism with the non-zero voltage level portions of the conduction cycle.The first and second synchronous rectifiers are selected to have lower activation voltagethresholds than the first and second switching devices such that both the first and secondsynchronous rectifiers remains activated during a successive zero voltage level portion ofthe conduction cycle.
申请人：Power-One, Inc.
地址：740 Calle Plano CamarilloCalifornia 93012 US
国籍：US
代理机构：Winter, Brandl, Fürniss, Hübner, Röss, Kaiser, PoltePartnerschaft
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