Asymmetrical bridge double-input DC/DC converters adopting pulsating voltage source cells

In the hybrid renewable power system, multiple-input dc/dc converters (MICs) serve as the interface of several sources with a load, and provide the energy to the load simultaneously or individually, which can optimize the utilization of sources, simplify the system configuration and reduce the overall cost. In the applications with isolated requirement, the available MICs usually have a complex configuration and numerous transformer windings. In this paper, a family of asymmetrical bridge double-input dc/dc converters (DICs) is proposed. Compared with the available isolated DICs, the proposed converters have the advantages of simple architecture and soft-switching realization. In this paper, the derivation and the control strategy of the converters are illustrated, and the operation principles are analyzed. Finally, the theoretical analysis is validated by the experimental results from a 240 W prototype.