Research on a non-complementary active clamp flyback converter with unfolding DC-AC inverter for decentralized grid-connected PV systems

This paper proposes a non-complementary active clamp flyback converter with unfolding dc-ac inverter for decentralized grid-connected PV systems. A current reference is applied to make the flyback output current half wave sinusoid. Combination of discontinuous conduction mode (DCM) and boundary conduction mode (BCM) is used to optimize the efficiency with the whole load range and to limit the maximum switching frequency. A non-complementary active clamp circuit is proposed to recycle leakage energy and achieve soft switching for the main switch, which further improve the efficiency of the circuit. Performance of the proposed circuit is validated by the simulation and experimental results.