A new ZCS series resonant high-voltage DC power supply

This paper presents a new topology based on the series resonant converter (SRC) for high-voltage application. The proposed topology consists of two series resonant tanks. Each series resonant tank is built up by connecting a tank capacitor in series to a high-voltage transformer with the leakage inductance of the high-voltage transformer is absorbed as resonant inductor. Therefore, two high-voltage transformers are used in this topology with their primary windings are connected in series and secondary output are rectified and mixed before supply to load. The series resonant tanks are energized alternately by controlling two IGBT switches with pulse frequency modulation (PFM). This topology is operating in discontinuous conduction mode (DCM) with all IGBT switches are operating in zero current switching (ZCS) condition and hence no switching loss occurs. Moreover, this topology has low conduction loss as it requires only half number of IGBT switches compared to conventional full-bridge inverter based SRC. The effectiveness of the proposed topology is verified by simulation using OrCAD PSpice and the simulation results are presented.