Design and Simulation of High Voltage DC Power Supply using ZVS Full Bridge AC-DC Converter

Abstract

The conventional phase-shifted zero voltage switching (ZVS) DC-DC converter is applied to the many power supplies in order to reduce the voltage and current stresses of the main switching devices. The ZVS method needs fairly large leakage inductance in the primary side of the high frequency power transformer to get good ZVS characteristics. During the small dead time between conductions of the two bridge legs, the increased magnetizing current resonates with MOSFET output capacitance, resulting in ZVS operation. Switching losses is quite reducing with the ZVS operation in Full bridge converter so efficiency of converter is increased. A crockroft-Walton voltage multiplier circuit is connected in secondary side of high frequency transformer which increases the output voltage level and rectified it. This study describes the details of high voltage DC power supply whose output voltage is 10kV, 100mA. Simulation is done by using PSIM 6.0 software. Design equations and Simulation results are presented and discussed.