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A Single-phase Buck-boost AC-AC Converter with Three Legs

  • Zhou, Min (Dept. of Electrical Engineering, Central South University) ;
  • Sun, Yao (Dept. of Electrical Engineering, Central South University) ;
  • Su, Mei (Dept. of Electrical Engineering, Central South University) ;
  • Li, Xing (Dept. of Electrical and Electronic Engineering, Hunan University) ;
  • Liu, Fulin (Dept. of Electrical Engineering, Central South University) ;
  • Liu, Yonglu (Dept. of Electrical Engineering, Central South University)
  • Received : 2016.08.23
  • Accepted : 2017.11.25
  • Published : 2018.03.01

Abstract

This paper proposes a single-phase buck-boost AC-AC converter. It consists of three legs with six switching units (each unit is composed of an active switch and a diode) and its input and output ports share a common ground. It can provide buck-boost voltage operation and immune from shoot-through problem. Since only two switching units are involved in the current paths, the conduction losses are low, which improves the system efficiency. The operation principle of the proposed circuit is firstly presented, and then, various operation conditions are introduced to achieve different output voltages with step-changed frequencies. Additionally, the parameters design and comparative analysis of the power losses are also given. Finally, experimental results verify the correctness of the proposed converter.

Acknowledgement

Supported by : National Natural Science Foundation of China, Natural Science Foundation of Hunan province of China

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