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:
May. 01, 2012
Filed:
Sep. 04, 2007
Stephen Thompson, London, GB;
Graham Booth, Leighton Buzzard, GB;
Clive Lopez, Whitehall, PA (US);
Lutron Electronics Co., Inc., Coopersburg, PA (US);
Abstract
A variable load circuit () is provided for use with a dimmer (). A low wattage load such as a LED () is provided in series with the dimmer and the variable load circuit is provided in parallel with the LED. The variable load circuit has two different load characteristics: when the applied voltage from the dimmer is below a threshold, the variable load circuit presents a fixed load (), and when the applied voltage is above a threshold the variable load circuit presents a variable load so as to act as a constant current sink. The variable load is provided by a secondary load portion () which may or may not act in combination with the fixed load (), and the secondary load portion () is switched in or out of the variable load circuit by a trigger circuit portion ().