Circuit for emergency lighting operation, has push-pull transformer operating at variable drive frequency

摘要

A circuit arrangement (1) for operating a lamp includes a terminal for the lamp (LA) and a load circuit (2) containing a resonance circuit, a battery or storage battery (3) for power supply through the load circuit, a push-pull converter (6) driving the load circuit (2). The drive frequency of the push-pull converter (6) is variable.