Electronic ballast and operating method for a gas discharge lamp

摘要

The device has a d.c. voltage converter (3) supplied by a d.c. voltage source (1,2) with a clocked switch and a regulated output voltage to an inverter (4) and a regulating circuit (7) producing a pulse width modulated switch-on pulse for the switch. The regulating circuit has two counters (Z1,Z2). The first counter has at least as many stages as the second and is reversible depending on whether an actual signal exceeds a desired signal.