Illumination device including LEDs and a switching power control system
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United States of America Patent
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Apr 16, 2013
Grant Date -
Dec 23, 2010
app pub date -
Jun 23, 2010
filing date -
Jun 23, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed herein is an illumination device including light-emitting diodes, an alternating current input, a full-wave rectifier coupled to the alternating current input and configured to produce a rectified voltage output and a power converter, the power converter having a switching element electrically coupled to the rectified voltage output of the full-wave rectifier. An improvement of the illumination device includes a feedback circuit configured to determine an average current across the light-emitting diodes and to invert a signal representing the average current to provide a switching signal to the switching element such that, for a range of operating points, increasing a current drawn into the power converter will decrease LED power and decreasing the current drawn into the power converter will increase LED power.
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