Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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A High Efficiency MHD Lamp Ballast with a Frequency Controlled Synchronous Rectifier

주파수 가변 동기 정류기를 이용한 고효율 MHD 램프 안정기

  • Hyun B.C. (Power Electronics System Lab. in Seoul National Univ.) ;
  • Lee I.K. (Power Electronics System Lab. in Seoul National Univ.) ;
  • Cho B.H. (Power Electronics System Lab. in Seoul National Univ.)
  • 현병철 (서울대학교 전기컴퓨터공학부 전력전자시스템 연구실) ;
  • 이인규 (서울대학교 전기컴퓨터공학부 전력전자시스템 연구실) ;
  • 조보형 (서울대학교 전기컴퓨터공학부 전력전자시스템 연구실)
  • Published : 2004.11.01
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Abstract

In this paper, in order to develop a simple and high efficient ballast without an external igniter, a half-bridge type ballast with a coupled inductor and a frequency controlled synchronous rectifier is proposed. The internal LC resonance of the buck converter is used In generate a high voltage pulse for the ignition, and the coupled inductor filter is used for steady state ripple cancellation. Also, a synchronous buck converter is applied for the DC/DC converter stage. In order to improve the efficiency of the ballast, a frequency control method is proposed. This scheme reduces a circulation current and turn off loss of the MOSFET switch on the constant power operation, which results in increase of the efficiency of the ballast system about $4\%$, compared to a fixed frequency control. It consists a 2-stage version ballast with a PFC circuit. The results are verified with hardware experiments.

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