Beijing Effiled Opto-Electronics Technology Co., Ltd

Yu Hai Mao

Richard Landry Gray

An approach is provided for devices and methods for driving an LED light, which adjust the numbers of diodes of the LED string corresponding to the rectified AC voltage. The device comprises a power module, a LED string, a current source and a controller. The LED string has multiple LED diodes connected in series that forms a major segment and multiple minor segments. The controller is connected to the current source and the LED string, which selectively shorts the LED diodes of the minor segments. Since the number of LED diodes of the LED string is dynamically adjusted in response to the rectified voltage, the overall 'on' voltage of the LED string is more closely matched to the rectified voltage, and thus the power efficiency is improved.

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Santa Clara, CA, United States of America

Yu Hai Mao