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문태환(Moon Tae Hwan),오덕진(0h Duk Jin),조규민(Cho Kyu Min),김희준(Kim Hee Jun) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper presents a high frequency modulation electronic ballast for the metal halide lamp. As the proposed ballast operates in high frequency ranges {20kHz - 100kHz) and it can start up the lamp using the LC resonant circuit without external ignitor, the proposed ballast is very compact. The proposed ballast is controlled with the modulated frequency in the range of 20kHz to 100kHz, and it has variable modulating frequencies between 200Hz and 2kHz in order to avoid the acoustic resonance phenomenon. In this paper, a new realtime acoustic resonance detection method is described and the experimental results with the proto-type ballast of 150W metal halide lamp with the dimming function are discussed.