Circuit to limit surges into a dc-operated lamp

摘要

A circuit to limit surges into dc-illuminated lamp, including a rectifier circuit having a smoothing means, an output terminal of the rectifier circuit being connected with a lamp; an inductor connected with an input terminal of the rectifier circuit: a surge-limiting means connected in series with its lamp: and a switching means having the main current path connected in parallel with the surge-limiting means, said switching means becoming conductive when the filament of the lamp is warmed up.