Circuit and method for starting and operating gas discharge lamps with preheating filaments

摘要

The gas discharge lamps (LP1,LP2) are supplied by a system with a rectifier (D1-4) having an output coupled to an electronic pumping circuit (UN1,D7,D8) and a capacitor (C31). An AC inverter (INV) connects with a resonator circuit (L3,C6,C7) having a regulator (CONT) and a preheater resistor controls attenuation. This operates to limit values from a switch.