The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Low-Cost High-Efficiency Two-Stage Cascaded Converter of Step-Down Buck and Tapped-Inductor Boost for Photovoltaic Micro-Inverters

태양광 마이크로 인버터를 위한 탭인덕터 부스트 및 강압형 컨버터 캐스케이드 타입 저가형 고효율 전력변환기

  • Jang, Jong-Ho (Dept. of Electrical Engineering, Soongsil University) ;
  • Shin, Jong-Hyun (Dept. of Electrical Engineering, Soongsil University) ;
  • Park, Joung-Hu (Dept. of Electrical Engineering, Soongsil University)
  • Received : 2013.10.07
  • Accepted : 2014.02.03
  • Published : 2014.04.20
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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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References

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