LIGHT EMITTING DIODE DRIVING CIRCUIT AND LIGHT EMITTING DIODE ILLUMINATION APPARATUS INCLUDING THE SAME
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United States of America Patent
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Issued Date -
Feb 19, 2015
app pub date -
Apr 2, 2013
filing date -
Apr 2, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A LED driving circuit drives a plurality of LED (Light Emitting Diode) groups, has a common voltage that is changed according to an input voltage of the plurality of LED groups, and includes a common node, a plurality of phase switches arranged between the output terminals of the plurality of LED groups and the common node, and a plurality of phase switch control units that form current flows among a corresponding LED group, a corresponding phase switch, and the common node in phase sections of the input voltage based on the common voltage and a corresponding reference voltage, the input voltage having a time-variable phase. Accordingly, the LED driving circuit can correct a power factor without using an inductor or a capacitor.
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