Analysis and Implementation of a Dual ZVS Flyback Converter

Bor-Ren Lin; Ming-Hung Yu
May 2010
International Review of Electrical Engineering;May/Jun2010 Part A, Vol. 5 Issue 3, p812
Academic Journal
This paper presents a zero voltage switching (ZVS) converter for requiring low output current ripple. The proposed converter includes two active-clamp flyback converters to have well regulated and smooth dc output without the need the output filter inductor. Two interleaved parts use the primary windings to share one capacitor and to realize the active-clamp. By the shared capacitor, the charge balance of two interleaved parts is automatically regulated under input voltage and load variations. Based on the resonance between the leakage inductor and equivalent output capacitors of switches during the transition interval, the switching losses of the switches are used. The interleaved pulse-width modulation (PWM) operation will further reduce the ripple current and the size of the output capacitor. Finally the prototype circuit with 12V output voltage and 40A output current has been built to verify the effectiveness and performance of the proposed circuit.


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