태양광 마이크로 인버터를 위한 탭인덕터 부스트 및 강압형 컨버터 캐스케이드 타입 저가형 고효율 전력변환기Low-Cost High-Efficiency Two-Stage Cascaded Converter of Step-Down Buck and Tapped-Inductor Boost for Photovoltaic Micro-Inverters
- Other Titles
- Low-Cost High-Efficiency Two-Stage Cascaded Converter of Step-Down Buck and Tapped-Inductor Boost for Photovoltaic Micro-Inverters
- Authors
- 장종호; 신종현; 박종후
- Issue Date
- Apr-2014
- Publisher
- 전력전자학회
- Keywords
- high efficiency; tapped-inductor; cascaded converter; low frequency inverter; micro-inverter
- Citation
- 전력전자학회 논문지, v.19, no.2, pp.157 - 163
- Journal Title
- 전력전자학회 논문지
- Volume
- 19
- Number
- 2
- Start Page
- 157
- End Page
- 163
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/10487
- DOI
- 10.6113/TKPE.2014.19.2.157
- ISSN
- 1229-2214
- Abstract
- This paper proposes a two-stage step-down buck and a tapped-inductor boost cascaded converter for high efficiency photovoltaic micro-inverter applications. The proposed inverter is a new structure to inject a rectified sinusoidal current into a low-frequency switching inverter for single-phase grid with unity power factor. To build a rectified-waveform of the output current. the converter employs both of a high efficiency step-up and a step-down converter in cascade. In step-down mode, tapped inductor(TI) boost converter stops and the buck converter operates alone. In boost mode, the TI converter operates with the halt of buck operation. The converter provides a rectified current to low frequency inverter, then the inverter converts the current into a unity power-factor sinusoidal waveform. By applying a TI, the converter can decrease the turn-on ratios of the main switch in TI boost converter even with an extreme step-up operation. The performance validation of the proposed design is confirmed by an experimental results of a 120W hardware prototype.
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