A Switched Capacitor Based Single-Switch Ultrahigh Step-Up DC-DC Converter

This paper proposes a switched capacitor based step-up DC-DC converter with the advantages of single-switch, continuously adjustable ultrahigh voltage gain and low input current ripple. To achieve high gain characteristics, the converter utilizes a quadratic boost converter on the input side to ensure continuous input current. Additionally, it implants the second winding of a coupled inductor within it, connecting it to the first winding of the coupled inductor and a voltage multiplier. The analysis includes a discussion of the operating principle, the derivation of the steady-state key equations, the voltage and current stress on the components, and the boundary condition. A functional prototype is built to confirm the theoretical analysis.