Self-power for device driver
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United States of America Patent
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Dec 10, 2013
Issued Date -
N/A
app pub date -
Dec 7, 2011
filing date -
Dec 7, 2011
priority date (Note) -
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Abstract
The disclosed implementations utilize the voltage drop inherent in the device string to power a device control IC. In some implementations, current is drawn from the bottom of the device string and applied to a voltage supply pin of the device control IC. In some implementations, current is drawn from some other location in the device string (e.g., near the bottom or midpoint of the device string) using a switch. In some implementations, current is drawn from near the bottom and the bottom of the device string at different times, such that less current is drawn from the bottom of the device string as the duty cycle of the device string increases and more current is drawn from near the bottom of the device string as the duty cycle of the device string increases.
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