Birch, Stewart, Kolasch & Birch LLP
LED driving circuit and method
In driving a segmented LED loading, an alternating current (AC) voltage is rectified into a direct current (DC) voltage; the DC voltage is regulated into an input voltage and the input voltage is maintained higher than a lowest voltage used for lighting at least one LED segment of the segmented LED loading; the input voltage and a current flowing through the segmented LED loading is detected to generate a switch control signal and a current control signal; respective operation states of each of a plurality of switches of a LED segment switch module are controlled by the switch control signal to control each LED segment of the segmented LED loading as power-supply state or no-power-supply state; and the current of the segmented LED loading is regulated based on the current control signal.
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
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inventional inventional additional inventional inventional
Wen-Tien Chi-Chun Ching-Ran Yu-Jen Che-Min
Tsai Huang Lee Chen Kung