An Optimization Design for Transformer and Output Filter of a Micro-inverter with Passive Integration Technique

Abstract

The transformer and output filter of the micro-inverter usually have a considerable footprint in the total system. In order to improve the power density of a micro-inverter, an integrated structure of passive components including transformer and output filter is proposed with flexible multilayer foils (FMLF). The topology of the micro-inverter is modified, which enables the integration of these passive components. In this paper, the design of the integrated structure is detailed. The distributed components model of the structure is established to verify the performance of the flexible foils. Finally, a prototype of the proposed structure is built and used in the micro-inverter. Experimental results are included to verify the integration design.