A bidirectional switched-capacitor based AC-AC resonant converter

A novel direct ac-ac converter based on the switched-capacitor and series resonant principle, featuring with soft switching characteristic and bidirectional power flow, is proposed in this paper. The converter consists of a LC resonant tank, switched-capacitors and reverse blocking IGBTs (RB-IGBT), resulting in small size and light weight; high efficiency is achieved by adopting soft switching technology. Moreover, this converter is designed to apply for 220/110V AC/AC voltage conversion applications. In order to demonstrate the performance of the new converter, its operation principle and control methods are described in detail. The feasibility of the theory analysis and control method has been verified by both simulation and experimental results.