Patent ID: 6933681
Filing Date: 2005-08-23
Classification: H05B,Y10S

Abstract:
1. A circuit arrangement for starting and operating discharge lamps (L, Lp 1 , Lp 2 ), with the following features: a first and a second line terminal (J a rectifier (D the rectifier output (N the side of the electronic pumping switch facing away from the rectifier output (N the main energy store (C the inverter output (N discharge lamps (L, Lp a controller (CONT), the controller output of which outputs an actuating signal, the controller output being coupled to the inverter (INV) in such a way that the actuating signal influences the inverter frequency, a first controller input (B a second controller input, into which there is fed via a threshold switch (TH, MOV), a second electrical variable, which corresponds to a second operating variable (B the value of the second electrical variable bringing about a greater value of the inverter frequency if the threshold value of the threshold switch (TH, MOV) is exceeded.