Generating a voltage feedback signal in non-isolated LED drivers
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United States of America Patent
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Jun 28, 2016
Grant Date -
Mar 17, 2016
app pub date -
Sep 15, 2014
filing date -
Sep 15, 2014
priority date (Note) -
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Abstract
An LED lamp comprises one or more LEDs, an inductive element coupled to an input voltage source and the one or more LEDs, and a switch coupled to the inductive element. A first current detector is coupled between the input voltage source and a ground node of the LED lamp, such that a current detected by the first current detector is proportional to a bulk voltage across the input voltage source. A second current detector is coupled between the inductive element and the ground node, such that current detected by the second current detector is proportional to a drain voltage across the switch. A switch controller controls the switch based on a feedback signal indicative of a voltage across the inductive element, which is generated based on a difference between the current detected by the second current detector and the current detected by the first current detector.
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