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:
Aug. 27, 2013
Filed:
Aug. 05, 2010
Byunghak Ahn, Seoul, KR;
Hak-hee Lee, Gyonggi-do, KR;
Il-young Jung, Gyonggi, KR;
Eung-woo Lee, Seoul, KR;
Byunghak Ahn, Seoul, KR;
Hak-Hee Lee, Gyonggi-do, KR;
Il-Young Jung, Gyonggi, KR;
Eung-Woo Lee, Seoul, KR;
Fairchild Korea Semiconductor Ltd., Bucheon, KR;
Abstract
An LED light emitting device includes LED channels with LEDs, a transformer that converts an input voltage and supply an output voltage to the LED channels, a controller, and an LED driver. The controller controls the transformer according to a first feedback signal for interrupting power supply to the LED channels when a dimming off state in which currents are not supplied to the plurality of LED channels occurs or when a state in which the maximum channel voltage of a plurality of channel voltages corresponding to voltages applied to the LED channels, respectively, is an overvoltage and a defective state in which the plurality of LED channels include an open state are maintained during a predetermined threshold period. The LED driver generates information on the dimming off state and information on the defective state.