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:
Jan. 31, 2017
Filed:
Nov. 04, 2013
Laurence P. Sadwick, Salt Lake City, UT (US);
Laurence P. Sadwick, Salt Lake City, UT (US);
Other;
Abstract
A dimming system includes an alternating current input, a reference crossing detector operable to detect when a signal derived from the alternating current input crosses a reference level, a ramp signal generator operable to generate a ramp signal with a changing voltage, wherein the ramp signal generator is operable to restart the ramp signal based on an output of the reference crossing detector, a switch operable to control a current derived from the alternating current input to a load output, a switch driver operable to control the switch based at least in part on the ramp signal, and a difference amplifier operable to generate a difference between the ramp signal and an input from a light sensor, wherein the switch driver is operable to control the switch based at least in part on the difference.