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

The Korean Institute of Power Electronics (전력전자학회)
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Resonant Step-Down DC/DC Converter to Reduce Voltage Stresses of Motor Driving Inverter under 3-phase AC Utility Line Condition

3상 전원 조건의 모터 구동 인버터 내압 저감을 위한 공진 강압형 DC/DC 컨버터

  • Received : 2013.09.12
  • Accepted : 2014.02.04
  • Published : 2014.10.20
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Abstract

This paper presents a resonant step-down DC/DC converter to reduce the voltage stresses of a 3-phase inverter module under the three-phase AC utility line condition. Under this condition, a conventional 3-phase inverter module suffers from high voltage stresses as a result of the high rectified DC link voltage; hence, a high-cost high-voltage-rating inverter module must be used. However, using the proposed converter, a low-cost low-voltage-rating inverter module may be adopted to drive the motor even under the 3-phase AC line condition. The proposed converter, which can be realized with small size inductor and low-voltage-rating semiconductor devices, operates at a high-efficiency mode because of the zero-current switching operations of all the semiconductor devices. The operational principles are explained and a design example is provided in the study. Experimental results demonstrate the validity of the proposed converter.

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References

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