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

The Korean Institute of Power Electronics (전력전자학회)
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DC Voltage Balancing Control of Half-Bridge PWM Inverter for Liniear Compressor of Refrigerator

냉장고의 선형압축기 구동을 위한 단상 하프브리지 인버터 시스템에서 직류단 불평형 보상에 관한 연구

  • Kim, Ho-Jin (Automotive Parts Technology Support Center, Busan Techno-Park) ;
  • Kim, Hyeong-Jin (Dept. of Electrical Eng., Pusan National University) ;
  • Kim, Dong-Youn (Dept. of Electrical Eng., Pusan National University) ;
  • Kim, Jang-Mok (Dept. of Electrical Eng., Pusan National University)
  • Received : 2017.01.04
  • Accepted : 2017.02.26
  • Published : 2017.06.20
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Abstract

This paper presents the control algorithm of a single-phase AC/DC/AC PWM converter for the linear compressor of a refrigerator. The AC/DC/AC converter consists of a full-bridge PWM converter for the control of the input power factor and a half-bridge PWM inverter for the control of the single-phase linear compressor. At the DC-link of this topology, two capacitors are connected in series. These DC-link voltages must be balanced for safe operation. Thus, a new control method of DC voltage balancing for the half-bridge PWM inverter is proposed. The balancing algorithm uses the Integral-Proportional controller and inserts the DC-offset current at the Proportional-Resonant current controller of the inverter to solve the DC-link unbalanced voltages between the two capacitors. The proposed algorithm can be easily implemented without much computation and additional hardware circuit. The usefulness of the proposed algorithm is verified through several experiments.

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References

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