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. 17, 2013
Filed:
Jan. 27, 2009
Viet Nguyen Hoang, Leuven, BE;
Radu Surdeanu, Roosbeek, BE;
Pascal Bancken, Opwijk, BE;
Benoit Bataillou, Brussels, BE;
David Van Steenwinckel, Holsbeek, BE;
Viet Nguyen Hoang, Leuven, BE;
Radu Surdeanu, Roosbeek, BE;
Pascal Bancken, Opwijk, BE;
Benoit Bataillou, Brussels, BE;
David Van Steenwinckel, Holsbeek, BE;
NXP B.V., Eindhoven, NL;
Abstract
A method of estimating the junction temperature of a light emitting diode comprises driving a forward bias current through the diode, the current comprising a square wave which toggles between high and low current values (I, l), the high current value (l) comprising an LED operation current, and the low current value (I) comprising a non-zero measurement current. The forward bias voltage drop (Vf) is sampled and the forward bias voltage drop (Vf) is determined at the measurement current (I)—The temperature is derived from the determined forward bias voltage drop.