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:
Mar. 12, 2019
Filed:
Nov. 13, 2017
Chemtron Research Llc, Dover, DE (US);
Anatoly Shteynberg, San Jose, CA (US);
Dongsheng Zhou, San Jose, CA (US);
Stephen F. Dreyer, Santa Clara, CA (US);
Harlan Ohara, San Jose, CA (US);
Sinan Doluca, Saratoga, CA (US);
Chemtron Research LLC, Wilmington, DE (US);
Abstract
An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes ('LEDs'). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.