LED drive circuit for SCR dimming
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United States of America Patent
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Oct 8, 2013
Grant Date -
Jan 6, 2011
app pub date -
Jul 6, 2010
filing date -
Jul 6, 2009
priority date (Note) -
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Abstract
A LED drive circuit for SCR dimming including an external controller configured to receive AC voltage from a power network to convert the AC voltage to an AC voltage with a lacked phase by phase controlling the voltage through a thyristor, and a LED driver that includes a bridge rectifier configured to shape the AC voltage with the lacked phase output into a unidirectional pulse DC voltage, and a phase angle detecting circuit configured to shape the AC voltage signal output with lacked phase from the external controller into a saw-tooth wave pulse signal.
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