A 10kv, 100mA DC Power Supply using Zero Voltage Switching with Full Bridge AC-DC Converter

Abstract

Nowadays a compact high voltage dc power supply is more in demand so high switching frequency is require for reduce the size of power supply. High switching frequency increase the switching loss which is minimize with the zero voltage switching. 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 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 are 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. Hardware results very close to the simulation results.