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A Modified Soft-Switched Push-Pull Topology with Phase-shift Modulation

Voltage-fed DC-DC isolated converter topologies in present day can be broadly classified into two categories. The first category has a working principle based on Pulse Width Modulation (PWM). Another class is based on Phase Shift Modulation (PSM). This paper proposes a modified Push-Pull converter having working principle based on PSM. The operation of the converter under steady state is discussed. The converter is integrated with a coupled LC regenerative snubber circuit. This snubber circuit is designed to achieve soft switching of switches, reducing switch stress and increased efficiency. The proposed converter is verified with an experimental prototype of 275 W output.