The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1995
Filed:
Mar. 28, 1994
Meerten Luursema, Veldhoven, NL;
Nicolaas H Reijnders, Eindhoven, NL;
U. S. Philips Corporation, New York, NY (US);
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.