Synchronous Rectifier Analysis of Forward Converterunder the

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Synchronous Rectifier Analysis of Forward Converterunder the [复制链接]

Abstract：W hile the converter works at light load，the output filter inductor current will go negative through
M0SFET in synchronous rectifier and the circulating current will be formed．In order to solve this problem ，the
detection method of light load condi tion of converter used by U C3842 is proposed in this paper，meanwh ile，the
technique has also been studied which is used to make the inductor current cannot be flow negatively by switching
off the M OSFET while converter works at light load．The theory analysis and experiment have proved that the
proposed method is effect，the converter efficiency has also been improved a lot at light load．