Three-Level SEPIC with Improved Efficiency and Balanced Capacitor Voltages

Choi, Woo-Young;Lee, Seung-Jae

  • Received : 2015.08.31
  • Accepted : 2015.11.17
  • Published : 2016.03.20


A single-ended primary-inductor converter (SEPIC) features low input current ripple and output voltage up/down capability. However, the switching devices in a two-level SEPIC suffer from high voltage stresses and switching losses. To cope with this drawback, this study proposes a three-level SEPIC that uses a low voltage-rated switch and thus achieves better switching performance compared with the two-level SEPIC. The three-level SEPIC can reduce switch voltage stresses and switching losses. The converter operation and control method are described in this work. The experimental results for a 500 W prototype converter are also discussed. Experimental results show that unlike the two-level SEPIC, the three-level SEPIC achieves improved power efficiency with balanced capacitor voltages.


Output capacitor voltage balancing;Switching loss;Three-level single-ended primary-inductor converter (SEPIC);Voltage stress


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Grant : BIPV 시스템을 위한 고효율 모듈형 마이크로 인버터 연구

Supported by : 전북대학교