Patent ID: 6590351
Filing Date: 2003-07-08
Classification: H05B

Abstract:
An operating device for operating at least one electric lamp, the operating device comprising:a control input (13, 14) for receiving a first electric voltage serving as a setpoint for control of an operating parameter of the at least one electric lamp (11), a transformer (15) having an input connected to the control input for receiving the first electric voltage and an output connected to an evaluation device (16), and an oscillator (19) connected to the output of the transformer (15) for producing a second electric voltage which changes periodically with time, the evaluation device (16) having a sample-and-hold element (22), and means (19, 21, 24) for matching frequencies of a sequence signal of the sample-and-hold element (22) and the second electric voltage, and for producing a phase shift between the sequence signal of the sample-and-hold element (22) and the second electric voltage in order to remove peaks in a combined voltage transmitted by the transformer (15) to the evaluation device (16).