Study and implementation of a single switch cascading high step-up DC-DC converter

In this paper, a novel high step-up DC-DC converter is proposed. The proposed converter is constructed of a boost converter with a coupled inductor technique to achieve high step-up voltage gain by a single switch. The front semi-stage is a boost converter and the rear semi-stage utilizes the coupled inductor and clamp circuit to reduce the voltage stress on the power switch. Thus, the low voltage-rating switch with low conduction resistance can be used to improve the system efficiency. The operating principle and steady-state analysis of the proposed converter are discussed in detail. Finally, a laboratory prototype circuit of the proposed converter with 24 V input voltage and 400 V/400 W output is implemented to verify the performance of the proposed converter.