HIGH EFFICIENT NATURALLY CLAMPED BIDIRECTIONAL PUSH-PULL DC/DC CONVERTER

Abstract

This paper proposes a secondary modulation based zero current switching (ZCS) current fed push-pull DC/DC converter. Due to the secondary modulation method, the proposed circuit achieves ZCS of the primary switches and ZVS of the secondary switches. The converter has advantages like (a) clamp circuits or snubber circuits are not required. (b) Soft switching of the converter is load independent (c) reduced switching stress (d) high efficiency. Steady state analysis, design, and implementation in MATLAB are presented for 20 kHz switching frequency and 19 W output power. Using the proposed converter 48 V DC is reduced to 12 V DC and the performance of the converter is compared with a conventional push-pull converter.