LED-BASED LIGHTING APPARATUS WITH LOW FLICKER
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United States of America Patent
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Issued Date -
Mar 26, 2015
app pub date -
Sep 24, 2013
filing date -
Sep 24, 2013
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Abandoned
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Abstract
An LED-based lighting apparatus is powered by multi-phase AC voltages to reduce flicker. A multi-phase AC-to-AC power generator is used to generate a plurality of AC voltages from an AC power source. The plurality of AC voltages each having a different phase are rectified by a plurality of rectifiers to provide a plurality of rectified AC voltages for a plurality of LED lighting units. Each LED lighting unit has voltage dependent brightness and reaches maximum brightness at different time due to the phase difference in the rectified AC voltage. The peak-to-peak variation in the total brightness is reduced and therefore the LED-based lighting apparatus has low flicker.
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