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. 13, 2021
Filed:
May. 20, 2020
Seoul Semiconductor Co., Ltd., Ansan-si, KR;
Hye Man Jung, Ansan-si, KR;
Keith Hopwood, Ansan-si, KR;
Seoul Semiconductor Co., Ltd., Ansan-si, KR;
Abstract
An LED lighting apparatus including a rectifier to rectify AC voltages having different magnitudes and generate driving voltages corresponding to rectified voltages, a buck converter connected to an output terminal of the rectifier and generate an LED driving current corresponding to the driving voltages, a variable reference voltage comparator to receive the driving voltages, and generate variable reference voltages that fluctuate in correspondence to magnitudes of the output driving voltages, compare the driving voltages and the variable reference voltages, and output signals for controlling an operation of the buck converter, an LED including at least one LED group and driven by the LED driving current generated by the buck converter, and a controller including a converter controller to control the operation of the buck converter and a constant current controller to constant current-control the LED driving current applied to the at least one LED group.