Yu-Chen LiuMing-Cheng ChenChun-Yu YangKATHERINE ANN KIMHuang-Jen Chiu2019-10-312019-10-31201819961073https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049654909&doi=10.3390%2fen11030569&partnerID=40&md5=fbd5f43fa25fce0a1eacff0604a49a7fAn isolated photovoltaic micro-inverter for standalone and grid-tied applications is designed and implemented to achieve high efficiency. System configuration and design considerations, including the proposed active-clamp forward-flyback resonant converter for the DC-DC stage and a dual-frequency full-bridge inverter for the DC-AC stage, are analyzed and discussed. A prototype microinverter system is built and tested. Experimental results verify the feasibility of the proposed system, which achieves 95% power conversion efficiency at full load. © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).Grid-tied inverter; High power density; High switching frequency; Microinverter; Photovoltaic; Photovoltaic applications; Power electronics; Solar energy; Wide-band gap switches[SDGs]SDG7journal article10.3390/en110305692-s2.0-85049654909