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US08368316B2 LED circuit and operation method of the same having minimum output voltage selection mechanism to generate feedback voltage 有权
具有最小输出电压选择机构的LED电路及其运算方法产生反馈电压

LED circuit and operation method of the same having minimum output voltage selection mechanism to generate feedback voltage
Abstract:
A LED circuit is provided. The LED circuit comprises: a plurality of LED channels, a driving module and a feedback-selecting module. The driving module supplies a driving voltage to the plurality of LED channels according to a feedback voltage. The feedback-selecting module comprises an open detection unit and a minimum-selecting unit. The open detection unit performs an open detection mechanism to separate the plurality of LED channels into a plurality of open LED channels and a plurality of non-open LED channels having an output voltage respectively. The minimum-selecting unit performs a selection mechanism to select a minimum output voltage as the feedback voltage from the output voltage of each of the plurality of non-open LED channels. A LED circuit operation method adapted in the LED circuit is provided herein as well.
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