Dimmer detector for bleeder circuit activation
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United States of America Patent
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Aug 2, 2016
Grant Date -
Nov 13, 2014
app pub date -
Apr 7, 2014
filing date -
May 7, 2013
priority date (Note) -
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Abstract
A circuit to be utilized for an LED driver bleeder activation. The circuit comprises a circuit block for timing a duration of any removed portion of a rectified line signal. The input of the circuit to be coupled to receive the phase controlled rectified line signal through a voltage divider. Comparing the divided rectified line signal with a threshold voltage and output a comparison result. A timer coupled to the comparator and responsive to the comparison result to time the duration of the removed portion of the rectified line signal and activate the bleeder activation circuitry to turn on the switching element of the bleeder to sink a controlled current from the input line.
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