OPERATING DEVICE FOR AT LEAST ONE ELECTRIC LAMP WITH A CONTROL INPUT, AND AN OPERATING METHOD FOR ELECTRIC LAMPS CONNECTED TO SUCH AN OPERATING DEVICE

摘要

The invention relates to an operating methodand an operating device for at least one electric lamp(11), which device has a control input (13, 14) forprescribing a setpoint for the brightness control ofthe lamp (11), and a transformer (15) for transmittingthe voltage impressed on the control input (13, 14) toan evaluation device (16) which serves to evaluate thevoltage impressed on the control input (13, 14).According to the invention, the evaluation device (16)comprises a sample-and-hold element (22) and means (19,21, 24) are provided for matching the frequency of thesequence signal of the sample-and-hold element (22) tothe frequency of a periodically varying voltage whichexcites the transformer (15) to transmit the voltageimpressed on the control input (13, 14) to theevaluation device (16), and means (19, 21, 24) forproducing a temporary constant phase shift between thesequence signal of the sample-and-hold element (22) andthe periodically varying voltage exciting, thetransformer to transmit.