EP 0449224 A1 19911002 - Apparatus for operating discharge lamp.
Title (en)
Apparatus for operating discharge lamp.
Title (de)
Apparat zum Einschalten von einer Entladungslampe.
Title (fr)
Appareil pour l'opération d'une lampe à décharge.
Publication
Application
Priority
JP 8164590 A 19900329
Abstract (en)
In an apparatus for operating discharge lamp of this invention, a DC output frequency supplied from a DC power source (12) can be varied by a high-frequency generator (20) and is supplied to a discharge lamp (241, 242). The ON state of the discharge lamp (241, 242) is detected by an ON detector (34). The output frequency of the high-frequency generator (20) is controlled such that a soft-start circuit (30) generates an output lower than that for normal ON operation of the discharge lamp (241, 242) during a start operation. At the same time, the output frequency of the high-frequency generator (20) is varied down to a level for the normal ON operation. When the ON detector (34) detects the ON operation of the discharge lamp (241, 242) the output frequency of the high-frequency generator (20) is switched to a level for the normal ON operation by a soft-start release circuit (32). <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/24 (2006.01); H02M 7/48 (2007.01); H05B 41/295 (2006.01)
CPC (source: EP KR)
H05B 41/24 (2013.01 - KR); H05B 41/295 (2013.01 - EP)
Citation (search report)
- [A] DE 3432266 A1 19850321 - KNOBEL ELEKTRO APP [CH]
- [A] EP 0091724 A1 19831019 - WESTINGHOUSE ELECTRIC CORP [US]
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0449224 A1 19911002; JP H03283297 A 19911213; KR 910017911 A 19911105; KR 940003773 B1 19940430
DOCDB simple family (application)
EP 91104798 A 19910326; JP 8164590 A 19900329; KR 910004907 A 19910328