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:
Oct. 07, 2008
Filed:
May. 23, 2006
Kurt Callewaert, Staden, BE;
Patrick Candry, Harelbeke, BE;
Paul Verledens, Izegem, BE;
Barco N.V., Kortrijk, BE;
Abstract
An electronic lamp control system for life time extension of a DC high intensity discharge lamp has a light sensor () for sensing an output of a lamp (), a power supply () for the lamp (), and a controller () for controlling the power supply (). The controller () has a high pass filter () for compensating for a leading edge of a detected change in lamp power output caused by each arc displacement. Lamp life is extended since damage to the lamp electrodes by the arc displacements is reduced. The system can have multiple lamps for the same illumination area, or multiple channels for illuminating different areas, coupled to provide uniform illumination. The controller () can compare a sensed level to a reference, to output a level control signal, then add a correction signal from the high pass filter to the level control signal.