LED light string and arrays with improved harmonics and optimized power utilization
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United States of America Patent
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N/A
Issued Date -
Oct 14, 2004
app pub date -
May 6, 2004
filing date -
Feb 12, 1999
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An AC driven LED light string assembly is provided possessing reduced harmonic distortion and improved electrical efficiency when one or more series blocks of LED lamps is employed. In one embodiment, there is provided an LED light string employing a capacitor coupled in parallel across the light string AC input, or end connector terminals. According to another embodiment, LED light strings are to be manufactured with a substantially equal number of light strings produced with all LEDs in forward bias (anode first) and reverse bias (cathode first). This allows true randomness when large numbers of single series block LED light strings are connected in an end-to-end manner. It is possible to apply this concept to single LED lamps having two chips where one chip is powered in reverse bias to the second chip; thereby providing self-canceling harmonics within the single LED lamp.
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