Non-isolated multi-port converter integrating PWM and phase-shift converters

Abstract

Multi-power-source systems containing multiple power sources have gained considerable attention since the advent of renewable energy sources, electric vehicles, etc. These systems tend to increase complexity and costs because multiple converters in proportion to the number of power sources are required to individually control each source. Multi-port converters (MPCs) that combine multiple converters into a single unit have been reported to achieve simplified systems at lower costs. Most conventional MPCs, however, pose major challenges such as the necessity of a transformer and low effective duty cycle. This paper presents a novel non-isolated MPC integrating a PWM converter and phase-shift converter. The proposed MPC, with simple topology containing only four power switches, achieves individual control of each source and bidirectional power flow. The detailed operation analysis was performed, and a 100-W prototype of the proposed MPC was built for the experimental verification. The experimental results showed that two output ports could be individually controlled with PWM and phase-shift controls, respectively, verifying its operation.