Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kenji Yamamoto0
Richard Lum Kok Keong0
Date of Patent
July 21, 2009
0Patent Application Number
118472730
Date Filed
August 29, 2007
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An LED lighting device of AC power-driven type having a comparatively simple constitution and a high power efficiency. The device compares a signal voltage (rectified voltage) obtained by rectifying an AC source with a predetermined reference voltage and controls ON/OFF of a driving current to each LED of an LED array in response to a comparison result. In this constitution, a large voltage of AC source enables lighting of more number of LEDs, while a small voltage thereof enables lighting of less number of LEDs, thus enhancing power efficiency of the LED lighting device.
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