Apparatus, system and method for cascaded power conversion
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United States of America Patent
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Feb 28, 2017
Grant Date -
Oct 29, 2015
app pub date -
May 4, 2015
filing date -
Jul 29, 2008
priority date (Note) -
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Abstract
An apparatus, method, and system are provided for power conversion to supply power to a load such as a plurality of light emitting diodes. An exemplary apparatus comprises: a first power converter stage having a first power switch and a first inductive element; a second power converter stage having a second power switch and a second inductive element; a plurality of sensors; and a controller. The second power converter stage provides an output current to the load. The controller is adapted to use a sensed input voltage to determine a switching period, and is further adapted to turn the first and second power switches into an on-state at a frequency substantially corresponding to the switching period while maintaining a switching duty cycle within a predetermined range.
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