Synchronous Rectification Using Resonant Capacitor Voltage for Secondary Side Resonant Active Clamp Flyback Converter

Shen Xu, Qinsong Qian, T. Tao, Limin Yu, Shengli Lu, Weifeng Sun
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引用次数: 3

Abstract

Secondary side resonant active clamp flyback (SSR-ACF) converter is a better candidate than primary side resonant active clamp flyback (PSR-ACF) converter to be used in high frequency small power supply applications. Based on the resonant capacitor voltage in SSR-ACF converter, this paper proposes an accurate synchronous rectification (SR) control method to turn off the synchronous rectifier (SRer) at the right point. Compared with the current widely used SR detecting method, the turn off point of SRer based on the presented method can not be affect by noise or voltage oscillation, and not need complicated sensing circuit. To verify the proposed SR control method, the simulation and experimental results of a 65w 19.5v output SSR-ACF converter are given. The results show that the SRer can be switched off at the right point by the proposed method. Compared with the current widely used SR detecting method, the efficiency in heavy load is improved by 0.3%.
二次侧谐振有源箝位反激变换器谐振电容电压同步整流
二次侧谐振有源箝位反激变换器(SSR-ACF)比一次侧谐振有源箝位反激变换器(PSR-ACF)更适合用于高频小功率电源。基于SSR-ACF变换器谐振电容电压,提出了一种精确的同步整流(SR)控制方法,使同步整流(SRer)在合适的点关断。与目前广泛使用的SR检测方法相比,该方法不受噪声和电压振荡的影响,且不需要复杂的检测电路。为了验证所提出的SR控制方法,给出了65w输出19.5v的SSR-ACF变换器的仿真和实验结果。结果表明,该方法可以在适当的点关闭SRer。与目前广泛使用的SR检测方法相比,重载时的检测效率提高了0.3%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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