—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.
—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:
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.