A 1-to-10 Fixed-Ratio Step-up Multi-Resonant Cascaded Series-Parallel (CaSP) Switched-Capacitor Converter with Zero-Current Switching

Resonant hybrid switched-capacitor converters (ReSCs) have the ability to achieve high efficiencies, power densities, and high power-handling capabilities. However, ReSCs have yet to be widely explored in high-voltage (HV) step-up application areas. In this work, we attempt to bridge the gap between ReSCs and the HV step-up application space by proposing a 1-to-10 step-up cascaded series-parallel (CaSP) converter. The principles of operation and functionality of the circuit are discussed and are validated with a hardware prototype. Experimental results up to 300 W and 350 V including efficiency and load regulation measurements and demonstration of zero-current switching (ZCS) are provided.