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:
Aug. 26, 2014
Filed:
Apr. 13, 2010
Ihor Lys, Milton, MA (US);
Michael Datta, Brookline, MA (US);
Gregory Campbell, Quincy, MA (US);
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
A device for detecting a dimmer phase angle set by operation of a dimmer for a solid state lighting load includes a processor having a digital input, a first diode connected between the digital input and a voltage source and a second diode connected between the digital input and ground. The device further includes a first capacitor connected between the digital input and a detection node, a second capacitor connected between the detection node and ground, and a resistance connected between the detection node and a rectified voltage node, which receives a rectified voltage from the dimmer. The processor is configured to sample digital pulses at the digital input based on the rectified voltage and to identify the dimmer phase angle based on lengths of the sampled digital pulses.