Patent ID: 6936976
Filing Date: 2005-08-30
Classification: H05B,Y10S

Abstract:
1. A circuit arrangement for starting and operating discharge lamps (L, Lp 1 , Lp 2 ), with the following features: an inverter, which delivers at an inverter output (N discharge lamps (L, Lp a preheating resistor (R an igniting phase, in which the preheating resistor (R a controller, the controller output of which outputs an actuating signal, the controller output being coupled to the inverter in such a way that the actuating signal influences the inverter frequency, a first controller input, into which there is fed a first electrical variable, which corresponds to the current of the gas discharge of a connected discharge lamp (Lp in the event that the first electrical variable assumes the starting value, the controller brings about an inverter frequency which lies between the damping resonant frequency and the natural frequency and in the event that the first electrical variable lies above the minimum value, the controller brings about an inverter frequency which leads to a desired lamp current or a desired lamp power.