APPARATUS HAVING UNIVERSAL STRUCTURE FOR DRIVING A PLURALITY OF LED STRINGS
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United States of America Patent
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Issued Date -
Jun 12, 2014
app pub date -
Dec 7, 2012
filing date -
Dec 7, 2012
priority date (Note) -
Abandoned
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Abstract
An apparatus comprises a plurality of controllable LED strings interposed with a plurality of switching units with each switching unit being connected between a leading controllable LED string and a trailing controllable LED string. A controller controls the switching units so that controllable LED strings are connected in a combination of series and parallel connections by connecting two adjacent leading and trailing controllable LED strings in series or parallel or by-passing the leading controllable LED string based on an automatically detected input voltage range. Each controllable LED string includes a plurality of LEDs connected in series between positive and negative ends of the controllable LED string and a plurality of controlling switches each corresponding to an LED. The number of LEDs connected in series in each controllable LED string is further adjusted by the controller as the input voltage varies with time.
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