High Voltage Gain Ratio Isolated Resonant Switched-Capacitor Converter for Sustainable Energy

A novel high-gain isolated two-switch boosting resonant switched-capacitor (ITBRSC) converter for sustainable energy is presented in this paper. It concludes a two-switch boosting resonant switched-capacitor (TBRSC) converter unit, an isolated transformer unit, and a load voltage regulation unit. There are two small value inductors in the proposed topology. They are, respectively, injected into the charge loop and the discharge loop. As a result, the pulsating input current is highly decreased. In this way, it could achieve the continuous input current in the primary side of ITBRSC converter. The TBRSC converter unit boosts the input voltage with the high gain ratio. In combination with the transformer, the ITBRSC converter could provide a good isolation performance by adopting the transformer. The proposed converter in this paper could be used in the variable input voltage and wide operation area. It could be acted as the high-gain isolated power supply for sustainable energy systems, such as electric vehicles and wind energy. The SC converter-based high-gain isolated converter could achieve the high power density and simple topology. A 500-W power-rating ITBRSC converter is constructed. The function of the ITBRSC converter is demonstrated and tested with the simulation and experiments. The high gain ratio and robust performance of the proposed converter are totally verified. It could facilitate the application of SC converters for sustainable energy.