음향 공명 현상을 제거한 MHL용 고출력 전자식 안정기 설계

High-Power Electronic Ballast Design for Metal-Halide Lamp without Acoustic Resonance

  • 박종연 (강원대학 전기.전자공학과) ;
  • 김기남 (강원대학 전기.전자공학과) ;
  • 이봉진 (강원대학 전기.전자공학과)
  • 발행 : 2008.07.01

초록

This paper presents a high-power electronic ballast for a metal-hallide lamp(MHL) that employs frequency modulation(FM) technique to eliminate acoustic resonance(AR). The proposed ballast consists of a full-bridge rectifier, a power factor correction(PFC) circuit, a full-bridge(FB) inverter, an ignitor using LC resonance and an FM control circuit. Whereas a manual PFC provides advantages in terms of high reliability and low cost for constructing the circuit, it is difficult to supply a stable voltage because of the output voltage ripple that occurs with a period of 120Hz. Although the ballast can be designed with a small size and a light weight if it is driven at a switching frequency between 1 and 100 kHz, AR will occur if the eigen-value frequency of the lamp coincides with the inverter's operation frequency. The operation frequency was modulated in real time according to the output voltage ripple to compensate for the variation in power supplied to the lamp and eliminate AR. Performance of the proposed technique was validated through numerical analysis, computer simulation using PSPICE and by applying it to an electronic ballast for a prototype 1kW MHL.

키워드

참고문헌

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