Integrated circuits for AC LED lamps and control methods thereof
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United States of America Patent
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May 30, 2017
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N/A
app pub date -
Oct 4, 2016
filing date -
Oct 4, 2016
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Abstract
An integrated circuit is suitable for use in an AC LED lamp and is configured to control a power bank coupled between a rectified input voltage and a ground voltage. The AC LED lamp has LED groups arranged in series between the rectified input voltage and the ground voltage. The power bank has a capacitor storing electric energy and a discharge switch coupled between the capacitor and the rectified input voltage. The integrated circuit has a path controller and a bank controller. The path controller controls conduction paths, each coupling a corresponding LED group to the group voltage. The bank controller turns on the discharge switch in response to a first path signal corresponding to a first conduction path, and turns off the discharge switch in response to a second path signal corresponding to a second conduction path. The first and second path signals are different from each other.
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