Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1994-03-28
1995-09-05
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315289, 315224, 315DIG7, H05B 3702
Patent
active
054481392
ABSTRACT:
A circuit arrangement for operating a high-pressure discharge lamp such that the high-pressure discharge lamp supplies a luminous flux of at least 60% of the nominal luminous flux within 1 s after ignition. The circuit arrangement is made up of a static converter for generating a DC voltage, a commutator provided with lamp connection terminals, a circuit for current stabilization during stable lamp operation by control of the static converter, and a circuit responsive to an instantaneous lamp voltage signal for operating the lamp with an increased run-up current and an increased power as compared with nominal rated operation during a lamp run-up period. A further circuit is provided so that the operation at the increased power includes at least a portion of the lamp run-up period for transition to normal operation. During this portion the increased power has a falling characteristic with a time constant that is independent of lamp voltage.
REFERENCES:
patent: 5103143 (1992-04-01), Daub
patent: 5241242 (1993-08-01), Daub
patent: 5268617 (1993-12-01), Daub et al.
Luursema Meerten
Reijnders Nicolaas H. G.
Blocker Edward
Franzblau Bernard
Pascal Robert J.
Shingleton Michael B.
U. S. Philips Corporation
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