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:
Jul. 16, 2013
Filed:
Jul. 23, 2009
Georg Sauerlaender, Aachen, DE;
Harald Josef Gunther Radermacher, Aachen, DE;
Georg Sauerlaender, Aachen, DE;
Harald Josef Gunther Radermacher, Aachen, DE;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
A light generating device () comprises: —an input for receiving a DC input voltage (Vin) of varying magnitude; —a controllable current source (); —a switch matrix () comprising a plurality of controllable switches (S-SN); —a plurality of n LEDs (D, D, . . . Dn) connected to output terminals of the switch matrix (); —a controller () controlling said switches and controlling the current generated by the current source dependent on the momentary value of the DC input voltage (Vin). The controller is capable of operating in at least three different control states. In a first control state all LEDs are connected in parallel. In a second control state all LEDs are connected in series. In a third control state at least two of said LEDs are connected in parallel while also at least two of said LEDs are connected in series.