CIRCUIT ARRANGEMENT

摘要

The invention relates to a circuit arrangement for operating a lamp comprising: circuit input terminals for connection to a supply voltage source, an inverter coupled to said circuit input terminals for generating an AC voltage with a frequency f out of a supply voltage supplied by the supply voltage source and equipped with inverter output terminals, a piezotransformer comprising transformer input terminals, coupled to the inverter output terminals, and transformer output terminals, terminals for lamp connection coupled to the inverter output terminals, a detector for detecting whether the lamp has ignited. In accordance to the invention the circuit arrangement is equipped with a protective device coupled between the output terminals of the inverter and the transformer output terminals. The inverter is effectively protected against ignition pulses generated by the piezotransformer.