International Journal of Environmental Science and Development

Abstract—A new active soft switching circuit for Zero Voltage Switched Pulse Width Modulated (ZVS-PWM) full bridge converter is presented in this paper. The proposed circuit has two auxiliary circuit cells (Auxiliary circuit cell-1, Auxiliary circuit cell-2), one for each ground referred active switch. Auxiliary circuit cell consists of an active switch, a diode, a resonant inductor and a capacitor, and a coupled winding derived from main power transformer. Auxiliary circuit when gated properly creates zero voltage across the main switch during its turn-on. Winding coupled to the power transformer helps in resetting auxiliary inductor current to zero and hence turn-off of auxiliary switch is lossless. Steady state operation of proposed circuit with necessary analytical expressions is presented. Circuit simulation results of the proposed active soft switched ZVS-PWM full bridge converter are presented.

Index Terms—Zero voltage switching, active soft switching, ZVS PWM full bridge.

The authors are with Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India (e-mail: gorla.indra@gmial.com, lakshmin@ee.iitm.ac.in).

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Cite:Naga Brahmendra Yadav Gorla and N. Lakshmi Narasamma, "A New Active Soft Switching Technique for Pulse Width Modulated Full Bridge DC-DC Converters," International Journal of Environmental Science and Development vol. 5, no. 1, pp. 20-25, 2014.