Reconfigurable Interleaved Active Voltage-Quadrupler Based Resonant DC-DC Converter for Wide Voltage Gain Range

Abstract

This article presents a reconfigurable interleaved active voltage-quadrupler rectifier based resonant dc-dc converter that operates under wide voltage gain range. The proposed converter operates as an interleaved symmetric voltage-quadrupler for voltage gain less than unity and an interleaved asymmetric active voltage quadrupler for voltage gain between one and two. When it operates as the interleaved asymmetric active voltage quadrupler, two asymmetric currents flow through the capacitors alternatively, which balances the voltages across the output-side capacitors. Under the balanced voltages across output-side capacitors, we acquire the precise voltage gain for each operational mode using the time-domain analysis. We present design guideline of the power components for the proposed converter considering both operations. As a result, the proposed topology exhibits a high step-up and wide output voltage characteristics without having a high transformer turns-ratio. A 1-kW prototype supporting 125-V input voltage and 100 similar to 800-V output voltage demonstrates the practical viability of the proposed converter.