APPARATUS FOR DRIVING LEDS USING HIGH VOLTAGE
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United States of America Patent
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Sep 30, 2014
Grant Date -
Oct 23, 2014
app pub date -
Apr 23, 2013
filing date -
Apr 23, 2013
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Abstract
An apparatus for driving LEDs using high voltage includes a plurality of LEDs divided into a plurality of LED segments connected in series and a plurality of three-terminal voltage controlled current limiting devices. Each of the current limiting devices is associated with one of the LED segments and has a first terminal connected to a negative end of the associated LED segment, a second terminal applied with a bias voltage and a third terminal connected to a common node. A current source is connected between the common node and ground. A power-loss reduction circuit having a plurality of LEDs controlled by an LED controlling circuit may further be inserted between the common node and the current source to reduce the power loss in the current source because of the high voltage at the common node.
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