Lighting circuit for vehicle discharge lamp with filter circuit and main circuit

摘要

The lighting circuit has a main circuit (3) and a filter circuit (2). The filter circuit includes a first inductance (L1) with two ends. One end is connected with the positive pole of an input DC voltage, whilst the other end is connected to the main circuit. A second inductance (L2) with two ends, one end of which is connected with the negative pole of the DC input voltage source and the other end with the main circuit. A first capacitance (C1) is arranged between one end of the first inductance and one end of the second inductance. A second capacitor (C2), which is connected between the other end of the first inductance and the other end of the second inductance. The filter circuit and the main circuit are covered by an interference voltage screen (5). The screen is electrically connected with the connecting line of one of the ends of the second inductance (L2) and the negative pole of the input voltage source, in order to exclude the lamp interference, which is produced whilst the discharge lamp is on.