EP 0677981 B1 20000712 - Ballast for discharge lamps with lamp change detecting means
Title (en)
Ballast for discharge lamps with lamp change detecting means
Title (de)
Vorschaltgerät mit Lampenwechselerkennung für Entladungslampen
Title (fr)
Ballast, avec dispositif de reconnaissance de changement de lampe, pour tubes à décharge
Publication
Application
Priority
EP 94105853 A 19940415
Abstract (en)
[origin: EP0677981A1] A method of driving ballast devices for gas-discharge lamps in which the ballast device is equipped with an inverter (1) and at least one gas-discharge lamp (La) is arranged in the lamp circuit. In the event of the lamp not starting (firing) the inverter is switched off. In order to improve the procedure by fully accommodating circuits with inductively coupled heating currents, lamp exchange (replacement) is ascertained by briefly switching on the inverter (1) again during the measurement phase and by measuring a current from the inverter in the lamp circuit during the measurement phase. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/298 (2006.01)
CPC (source: EP US)
H05B 41/2985 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 0677981 A1 19951018; EP 0677981 B1 20000712; AT E194749 T1 20000715; DE 59409443 D1 20000817; US 5550433 A 19960827
DOCDB simple family (application)
EP 94105853 A 19940415; AT 94105853 T 19940415; DE 59409443 T 19940415; US 42192295 A 19950414