Multi-output ZCS-SR inverter fed voltage multiplier based high voltage DC-DC converter

Abstract

This paper proposes a multi-output ZCS-SR inverter fed voltage multiplier based high voltage dc-dc converter to achieve wide range of controllability. The SR-inverter in the proposed system has four outputs that are connected to a single transformer linked load via four resonant capacitors each of which have distinct capacitance. Due to distinct values of resonant capacitors, the impedance of tank circuit and hence the power transfer rate is different for four outputs. Thus all the four inverter outputs are fed to load in parallel when maximum load power is desired and a single output that has highest tank circuit impedance is fed to load when lowest load power is required and vice versa. For the four inverter outputs there are sixteen possible combinations to feed them to load in parallel, thus the load power increase from its lowest value to highest in sixteen steps. Switching frequency is adjusted within in its narrow limits to adjust the voltage between two nearest steps. Proposed high voltage converter have several features such as wide range of control, less voltage ripple and low current stress on power switches. The proposed converter is simulated using PSPICE software and results confirm its better performance.