A Novel Single Switch Step Down Converter

A new step-down dc-dc converter with one active switch and two diodes is presented in this paper. Compared to other buck type topologies, the proposed converter exhibits smooth current at the input and it is shown to be better suited in applications where a small difference between the input and output voltage is required. This novel converter efficiency is excellent over a wide range of the duty cycle. A dc analysis is performed and main equations in steady state are provided, then device stresses are evaluated and compared to other buck topologies in many aspects showing better features. A prototype based on the design equations presented in this paper is simulated and then experimentally tested. The experimental results confirm the theoretical considerations and the simulations, proving the feasibility of the proposed topology.