Schaltungsanordnung zum Betrieb einer Hochdruck-Gasentladungslampe mit Wechselstrom

摘要

A circuit arrangement for generating an a.c. voltage, especially the arc drop voltage of a high-pressure gas discharge lamp in a motor vehicle headlamp, contains a converter (1) with a primary winding (2) and a secondary winding (3) closely coupled together. These two windings form an auto-transformer. One of the terminals of the primary winding (2) is connected to a d.c. voltage source (4). Its other terminal, the intermediate tapping (5) of the converter, is connected on one side to the secondary winding and on the other to a controlled switch (6). The controlled switch connects the intermediate tapping to the negative pole of the d.c voltage source. The second terminal of the secondary winding (3) is connected via a capacitor (7) to a high-pressure gas discharge lamp (8) forming the output load. The output a.c. voltage (UA), i.e. the arc drop voltage, is across it. The switch is damped by the series connection of a resistor (10) and a capacitor (11).