Aðferð og útbúnaður til að skipta um glóðarþráð ljósaperu, ásamt peru með mörgum glóðarþráðum

摘要

PCT No. PCT/FI88/00153 Sec. 371 Date Jun. 28, 1989 Sec. 102(e) Date Jun. 28, 1989 PCT Filed Sep. 23, 1988 PCT Pub. No. WO89/03119 PCT Pub. Date Apr. 6, 1989.An automatic replacement circuit is provided for the replacement of burnt-out filaments as well as a method for implementing the replacement of incandescent filaments. The replacement circuit includes a pulse generator which operates independently of the activated filament to feed continuous feed pulses to a counter circuit while a separate resetting pulse circuit delivers resetting pulses to the counter unit in dependence on the current flowing through the filament. The resetting pulses cancel the feed pulses. In the absence of resetting pulses, the feed pulses accumulate and upon reaching a predetermined amount, trigger a trigger selector circuit for activating the next filament.