EP 0034401 A2 19810826 - Discharge lamp circuit.
Title (en)
Discharge lamp circuit.
Title (de)
Schaltung für Entladungslampen.
Title (fr)
Circuit pour lampes à décharge.
Publication
Application
Priority
GB 8004226 A 19800208
Abstract (en)
Two (or more) gas discharge lamps (10, 110), each in series with a choke ballast (18, 118) across A.C. supply terminals (16a, 16a) are started by a single starter circuit (70), the lamps being connected to the starter circuit through respective rectifying diodes (150, 152). The starter circuit (70) operates with rectified half-cycles of the A.C. supply, and resistors (154, 156) balance the cathode heating currents between the two lamps. Preferably the starter circuit is rendered ineffective in a failed-lamp condition, and to this end (per DE-OS 28 16 415) it includes a thyristor (26) triggered by a control circuit which includes a capacitor (32) effective to increase the instantaneous applied voltage which is required to trigger the thyristor with successive cycles of the applied voltage after initial switch-on of the circuit. A Zener diode (30) is in series with the capacitor (32).
IPC 1-7
IPC 8 full level
H05B 41/04 (2006.01)
CPC (source: EP)
H05B 41/046 (2013.01)
Designated contracting state (EPC)
AT CH DE GB IT NL
DOCDB simple family (publication)
EP 0034401 A2 19810826; EP 0034401 A3 19810902; EP 0034401 B1 19840919; AT E9530 T1 19841015; AU 6628381 A 19810813; DE 3166098 D1 19841025; GB 2069779 A 19810826; NZ 196081 A 19831130
DOCDB simple family (application)
EP 81300106 A 19810112; AT 81300106 T 19810112; AU 6628381 A 19810116; DE 3166098 T 19810112; GB 8004226 A 19800208; NZ 19608181 A 19810122