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:
Jul. 11, 2017
Filed:
Jan. 14, 2016
Silergy Corp.;
Tobias Sebastiaan Doorn, Eindhoven, NL;
Arjan van den Berg, Nijmegen, NL;
Silergy Corp., Cayman Islands, GB;
Abstract
There is disclosed a driver for driving a series arrangement being a variable number of strings of LEDs wherein each string has a capacitance connected in parallel with the respective string; the driver comprising: a controllable current source adapted to be connected in series between the series arrangement and a rectified AC supply to and source a controllable current (Istr) through the series arrangement; and a current source controller adapted to control the controllable current source; wherein the current source controller is operable to source a relatively lower current (I') when a difference (VstrA) between the voltage across the series arrangement and the voltage of the rectified AC supply is relatively higher and a relatively higher current (I) when the difference is relatively lower. Associated driver circuits and lighting circuits, and methods are also disclosed.