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    • 3. 发明授权
    • Controlling gas discharge lamp intensity with power regulation and end of life protection
    • 控制气体放电灯强度与功率调节和寿命终止保护
    • US06232727B1
    • 2001-05-15
    • US09168211
    • 1998-10-07
    • Alland CheeJohn B. Sampson
    • Alland CheeJohn B. Sampson
    • G05F100
    • H05B41/2985H05B41/3925
    • A method and apparatus for controlling the operation of a gas discharge lamp including regulation of power provided to the lamp for maintaining a preselected illumination intensity, automatic lamp shut down for preventing a catastrophic failure of the lamp, and automatic selection of operating frequencies for increasing efficiency and extending useful life of the lamp. An appropriate quality factor Q is achieved by including a low pass filter followed by a high pass filter in the lamp network so as to allow deep dimming of the lamp. Preferably, the arc power delivered to the lamp network is sensed and regulated. By sensing the arc power instead of only the lamp current, the illumination intensity of the lamp is accurately regulated. Further, the lamp ballast is automatically shut down near the end of the lamp's useful life, before operation in partial rectification. Preferably, power to the lamp is shut off based on the arc power entering the lamp network instead of relying only on the voltage of the lamp to avoid unnecessarily shutting down the lamp. The lamp network is automatically operated at an appropriate frequency selected from among a plurality of predetermined frequencies according to the lamp's present mode of operation including: preheating, starting, and continuous operation. Preferably, each frequency is optimized for the particular lamp and for the particular mode of operation.
    • 一种用于控制气体放电灯的操作的方法和装置,包括调节提供给灯的功率以保持预选的照明强度,自动关灯以防止灯的灾难性故障,以及自动选择用于提高效率的工作频率 并延长灯的使用寿命。 通过在灯网络中包括低通滤波器和高通滤波器来实现适当的品质因数Q,以便允许灯的深度调光。 优选地,感测和调节传递到灯网络的电弧功率。 通过感测电弧功率而不仅仅是灯电流,灯的照明强度被精确地调节。 此外,在部分整流操作之前,灯泡镇流器将在灯的使用寿命结束前自动关闭。 优选地,基于进入灯网络的电弧功率而关闭灯的电源,而不是仅依赖于灯的电压,以避免不必要地关闭灯。 根据灯的当前操作模式,灯网络以从多个预定频率中选出的适当频率自动操作,包括:预热,启动和连续操作。 优选地,每个频率针对特定的灯和特定的操作模式进行了优化。