AC LED LIGHTING SYSTEMS AND CONTROL METHODS EFFICIENTLY PROVIDING OPERATING VOLTAGE
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United States of America Patent
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May 23, 2017
Grant Date -
Jun 1, 2017
app pub date -
Nov 30, 2015
filing date -
Nov 30, 2015
priority date (Note) -
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Abstract
A LED lighting system efficiently provides an operating voltage powering integrated circuits. A LED string has LEDs segregated into LED groups connected in series. A LED controller has channel nodes connected to the cathodes of the LED groups respectively, and an output node connected to a capacitor providing the operating voltage. The LED controller drains a channel current from a selected channel node among the channel node. The LED controller regulates the channel current to a channel target value corresponding to the selected channel node, and provides a portion of the channel current as a charging current to power and regulate the operating voltage.
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