An Extendable Voltage Multiplier Based Multi-Input DC/DC Converter with Soft-Switching Operation

Abstract

In this paper, an extendable multi-input (MI) non-isolated resonant dc-dc converter is proposed by using current-fed voltage multiplier (VM) cells for renewable energy application. The input sources have continuous currents with low ripples, which reduce the input filters volumes and costs. Furthermore, zero voltage switching (ZVS) turn on of its switches, as well as zero current switching (ZCS) of diodes, are realized and the reverse recovery problem of the diodes is effectively eliminated. By using the VM cells, the voltages stresses of the components are reduced, so low voltage-rating components can be used, which reduces conduction losses and costs and increases efficiency of the converter. Also, by increasing the number of the VM cells, voltage gain can be improved, without using extremely high duty cycles values. The given topology, its operation principles, as well as its steady-state analysis and characteristics, are discussed, in detail. Finally, the proposed converter has been designed and simulated at 1 kW output power with 50 V input voltage and 800 V output voltage to validate the given analysis and advantages of the proposed converter.