LED drive circuit
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United States of America Patent
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Oct 20, 2015
Grant Date -
Apr 30, 2015
app pub date -
Mar 14, 2013
filing date -
Mar 16, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An LED drive circuit includes: a rectifier circuit that outputs a full-wave rectification waveform voltage; a primary LED row that includes a first partial LED row and a second partial LED row; an auxiliary LED row; a bypass circuit that is connected to part connecting the first partial LED row and the second partial LED row and that returns current from the first partial LED row to the rectifier circuit; and a current limiting circuit that limits the current flowing through the auxiliary LED row wherein the primary LED row and the auxiliary LED row are connected in parallel to the rectifier circuit; and the bypass circuit blocks the current passing through the bypass circuit in accordance with the current flowing through the primary LED row, and controls and blocks the current flowing through the auxiliary LED row.
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