| 摘要 |
A mercury vapor electric discharge lamp is supplied with AC electric power, which is variable over a wide range, to control the lamp output power in the form of the intensity of the electromagnetic radiation emitted over a correspondingly wide range of from approximately 5% to 100% or better of rated output power without lamp extinction. An AC phase modulation control circuit controls the AC electric power supplied to the lamp such that applied voltage remains relatively constant while the current is controllably varied determined by the phase angle of conduction in the control circuit. Control of the AC phase modulation control circuit is effected in response to the actual output power of the electromagnetic radiation emitted by the lamp, the speed of a printing press or conveyor line with which the lamp may be used to cure ultraviolet sensitive inks, paints, plastics and the like on some form of substrate. Moreover, the actual lamp intensity, when below a called for intensity, may be used to control the speed of the press conveyor, process line and the like. Means also are disclosed to indicate, for example, lamp aging, press or process slow down and the like, and a lamp cooling blower is automatically controlled to vary the amount of colling proportional to lamp output power. |
