Simulation of a Step-up Resonant Switched-Capacitor Converter under the CCM Operation Mode

This paper presents a resonant switched capacitor converter (SSC) above its resonant frequency to achieve zero voltage switching (ZVS) operation and overcome its voltage regulation issue. The ZVS operation under the CCM operation mode reduces switching losses and improves the converter efficiency more than zero current switching (ZCS) operation below the resonant frequency in MOSFET based converters. In addition, under the CCM operation mode the output voltage can be regulated as the input voltage or load current varies in a wide range. The symmetrical dual structure proposed converter causes the input current ripple and output voltage ripple to be reduced more in contrary to previous researches. Therefore, the input filter and output capacitor are reduced, effectively. The proposed SCC has been simulated to regulate a 400 V output voltage when wide input voltage (80-120V) and output power (50-320 W) variations are applied. to regulate the output voltage switching frequency variation from 200.2 kHz up to 415 kHz is necessary.