Highly Efficient Microinverter With Soft-Switching Step-Up Converter and Single-Switch-Modulation Inverter
SCIE
SCOPUS
- Title
- Highly Efficient Microinverter With Soft-Switching Step-Up Converter and Single-Switch-Modulation Inverter
- Authors
- Cha, WJ; Cho, YW; Kwon, JM; Kwon, BH
- Date Issued
- 2015-06
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Abstract
- This paper presents a novel microinverter for a single-phase grid-connected photovoltaic (PV) system. The proposed microinverter consists of a step-up dc-dc converter using an active-clamp circuit with a series-resonant voltage doubler and a high-efficiency inverter with single-switch-modulation step-down converters. The active-clamp circuit provides zero-voltage switching (ZVS) turn-on, recycles the energy stored in the leakage inductance of the transformer, and limits switch voltage stress. Moreover, to remove the reverse-recovery problem of the rectifier diodes, a series-resonant voltage doubler is used. Thus, this whole process provides high efficiency. To improve efficiency and reliability in the proposed inverter, only a single switch is modulated at the switching frequency without a shoot-through problem. A modified controller is also adopted to achieve fast output control. Thus, the proposed PV microinverter has the structure to minimize power losses. The experimental results show a maximum efficiency of 96.2% for a 400-W microinverter.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/27000
- DOI
- 10.1109/TIE.2014.2366718
- ISSN
- 0278-0046
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 62, no. 6, page. 3516 - 3523, 2015-06
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