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:
Feb. 01, 2011
Filed:
Sep. 21, 2007
Dongsheng Zhou, San Jose, CA (US);
Anatoly Shteynberg, San Jose, CA (US);
Harry Rodriguez, Gilroy, CA (US);
Mark Eason, Hollister, CA (US);
Lanh Nguyen, Santa Clara, CA (US);
Dongsheng Zhou, San Jose, CA (US);
Anatoly Shteynberg, San Jose, CA (US);
Harry Rodriguez, Gilroy, CA (US);
Mark Eason, Hollister, CA (US);
Lanh Nguyen, Santa Clara, CA (US);
Exclara, Inc., Santa Clara, CA (US);
Abstract
An apparatus, method and system are provided for controlling the solid state lighting, such as LEDs. An exemplary apparatus comprises: a switch for switching electrical current through the LEDs, a current sensor; a first comparator adapted to determine when a switch electrical current has reached a first predetermined threshold; a second comparator adapted to determine when the switch electrical current has reached a predetermined average current level; and a controller. The controller is adapted to turn the switch into an on state and an off state, to determine a first on time period as a duration between either a detection of a second predetermined current threshold or the turning the switch into the on state, and the detection of the predetermined average current level; to determine a second on time period as a duration between the detection of the predetermined average current level and the detection of the first predetermined current threshold; and to determine an on time period of the switch as substantially proportional to a sum of the first on time period and the second on time period. Additional exemplary embodiments utilize a difference between the first and second on time periods to generate an error signal to adjust the on time period of the switch.