Single inductor control of multi-color LED systems
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United States of America Patent
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May 12, 2015
Grant Date -
Jan 30, 2014
app pub date -
Oct 1, 2013
filing date -
Nov 24, 2008
priority date (Note) -
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Abstract
A circuit for driving multiple light emitting diodes (LEDs) includes at least two sets of LEDs, each set comprised of one or more LEDs in series. The circuit further includes a single inductor connected in series with the two sets of LEDs. At least one set of LEDs is connected to a shunting transistor connected in parallel with the set of LEDs. The duty cycle of the shunting transistor is controlled by a single controller connected to the shunting transistor and the inductor.
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