Drive circuit for light emitting diode array based on a buck-boost topology
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United States of America Patent
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Jun 24, 2014
Grant Date -
May 3, 2012
app pub date -
Oct 29, 2010
filing date -
Oct 29, 2010
priority date (Note) -
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Abstract
Features of the invention are related to drive circuits that provide both power factor correction and voltage conversion in a single circuit and in some implementations drive an LED array. This single stage converter uses a buck-boost topology and can operate LED arrays that have DC voltages above or below the AC line voltage. An output side filter and bulk energy storage device is placed at the output of the circuit. Bulk energy storage can be provided by an inductor, a capacitor, or a combination of an inductor and a capacitor. The output side filtering can be provided by a capacitor or a capacitor and an inductor. The circuit also includes a switch and a switch control device for controlling the switch to provide power factor correction.
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