Driving circuitry for LED lighting with reduced total harmonic distortion
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United States of America Patent
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Mar 15, 2016
Grant Date -
Jul 25, 2013
app pub date -
Jan 20, 2012
filing date -
Jan 20, 2012
priority date (Note) -
Withdrawn
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Abstract
Conditioning circuits are provided for driving two or more LED groups using a rectified AC input voltage. The conditioning circuits uses analog circuitry to gradually and selectively activate the LED groups based on an instantaneous value of the rectified input voltage. The circuit includes a first series interconnection of a first LED group, a first transistor, and a first resistor, and a second series interconnection of a second LED group, a second transistor, and a second resistor. In one example, the second series interconnection is connected between a drain terminal and a source terminal of the first transistor, while in another example, the second series interconnection is connected between an anode of the first LED group and a source terminal of the first transistor. The first and second LED groups are selectively activated by the rectified voltage applied across the first series interconnection.
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