High-efficiency LED driver and driving method
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Oct 2, 2015
filing date -
Jul 19, 2012
priority date (Note) -
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Abstract
Disclosed are LED driver circuits, and methods of driving LED loads. In one embodiment, an LED driver can include: (i) an SCR coupled to an AC power supply, and configured to generate a DC voltage through a first rectifier circuit; (ii) a first stage conversion circuit having an isolated topology with power factor correction, where the first stage conversion circuit is configured to convert the DC voltage to a first output voltage; (iii) where the first stage conversion circuit includes a transformer having a primary side coupled to the DC voltage, and a secondary side coupled to the first output voltage through a second rectifier circuit; and (iv) a second stage conversion circuit having a non-isolated topology, where the second stage conversion circuit is configured to convert the first output voltage to an output current configured to drive an LED load based on a conducting angle of the SCR.
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