An Optimized Topology of Interleaved Flyback Micro-Inverter with Y-type Auxiliary Branch Based on Three-Stage Hybrid Control

In this paper, an optimized topology based on three-stage hybrid control of discontinuous conduction mode (DCM) and boundary conduction mode (BCM) for interleaved flyback micro-inverter is presented. In the proposed topology, a novel Y-type auxiliary branch is designed to realize the multiple optimizations for both mode in hybrid control thus improving the overall efficiency. Moreover, this topological configuration, there is a notable reduction in component count and cost compared with conventional structures. Principle and characteristics of the proposed optimization are analyzed, and its feasibility is verified by simulations based on a 200 W flyback micro-inverter.