A new dimming circuit for discharge lamps

抄録

This paper represents a new continuous dimming circuit for fluorescent and High-Intensity Discharge(HID) lamps controlled by inverse parallel connected thyristors with a newly introduced auxiliary step-up transformer. The dimming circuit can not only regulate the light output over range from 100% to 1% continuously, but also can sustain lamp burning steady even if in a lower ambient temperature. These features of the dimming circuit are due to giving a sufficient high reignition voltage to discharge lamps and continuing the lamp current, even though the thyristors are in off period, by the auxiliary step-up transformer.