Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference (한국조명전기설비학회:학술대회논문집)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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Implementation of a Digital Ballast for HID Lamps

HID 램프 디지털 안정기의 제작

  • 이치환 (위덕대학교 정보통신공학부)
  • Published : 2003.11.01
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Abstract

This paper presents a microprocessor controlled digital ballast for HID lamps, which gives intelligent features such as a precise power control, optimum ignition voltage and detection of end of life. Average current mode PFC is employed for reducing EMI and a universal input. Direct spread spectrum is done by applying 1 KHz triangular wave for removing acoustic resonance. This frequency modulation of 1 KHz gives also low EMI level and no ripple on lamp current. The microprocessor controls the voltage of DC-bus, the voltage of ignition pulses, the power of output and the bandwidth of spread spectrum. A 250W digital ballast is implemented with an efficiency of 93％ and a maximum EMI level of 55 ㏈${\mu}$V.

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