EP 0083992 A1 19830720 - Circuit and method for controlling the output illumination of one or more gas discharge lamps.
Title (en)
Circuit and method for controlling the output illumination of one or more gas discharge lamps.
Title (de)
Stromkreis und Verfahren zur Regelung der Ausgangsbeleuchtung von einer oder mehreren Gasentladungslampen.
Title (fr)
Circuit et procédé pour régler l'éclairage de sortie d'une ou de plusieurs lampes à décharge ou gaz.
Publication
Application
Priority
US 33834082 A 19820111
Abstract (en)
An integral ballast and control circuit (40) provides control of the output illumination through a timed interval controlled impedance (62), serially coupled between a winding of a magnetic ballast and series connected gas discharge lamps (12,14). When in its non-conducting state, the controlled impedance 62 interrupts the lamp discharge current. A timed control signal is applied to the impedance 62 at a gate electrode 62 by a control circuit 60 which receives power and timing signals from the magnetic ballast. The illumination level adjacent the lamps (12,14) is sensed by photocell (72) connected by leads (66) to the control circuit (60), which includes two control loops, one responding to the photocell output and the other to the lamp discharge current sensed adjacent the controlled impedance (62).
IPC 1-7
IPC 8 full level
H05B 41/392 (2006.01)
CPC (source: EP)
H05B 41/3922 (2013.01)
Citation (search report)
- WO 7900615 A1 19790906 - ELSTROM ELECTRONIC [CH], et al
- DE 2912690 A1 19791004 - ESQUIRE INC
- US 3894265 A 19750708 - HOLMES KENNETH P, et al
- DE 2262629 B2 19760108
- US 4197485 A 19800408 - NUVER ERIC L H [US]
- US 4207418 A 19800610 - BAILEY DENIS M [US]
- US 4207497 A 19800610 - CAPEWELL DENNIS [US], et al
- US 3845350 A 19741029 - LUURSEMA M, et al
Designated contracting state (EPC)
CH DE FR GB IT LI SE
DOCDB simple family (publication)
EP 0083992 A1 19830720; AU 8929682 A 19830721; JP S58121597 A 19830719
DOCDB simple family (application)
EP 83300124 A 19830111; AU 8929682 A 19821012; JP 18827482 A 19821028