Analysis and design of a soft-switching Sepic–Cuk converter

Abstract In this article, the steady-state analysis and implementation of a Sepic–Cuk converter with an active snubber to achieve zero voltage switching (ZVS) are presented. In the proposed converter, the Sepic and Cuk topologies are combined together on the output side. The advantages of the proposed converter are as follows: it reduces the number of circuit components (by sharing the circuit components on the transformer's primary side) and shares the load current. A boost type active snubber is connected in parallel with the main switch to release the energy stored in the leakage inductor of the transformer and to limit the peak voltage stress of the switching devices. The switches are turned on at ZVS during the transition interval based on resonance with the parasitic capacitor and the transformer leakage inductor. The design and performance of the proposed converter are confirmed with experiments on a 240 W prototype converter. Keywords: power conversionsoft-switchingpower converter