Driving circuit with dimming controller for driving light sources
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United States of America Patent
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-
Feb 2, 2016
Grant Date -
Jan 22, 2015
app pub date -
Oct 8, 2014
filing date -
Dec 12, 2008
priority date (Note) -
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Abstract
A driving circuit includes a power converter, a dimming controller and a current path coupled to the dimming controller. The power converter receives input power from a rectifier and provides output power to a light source. A power switch transfers power from an AC power source to the rectifier when the power switch is on. The dimming controller receives a switch monitoring signal indicative of the state of the power switch. An average current flowing through the light source has a first value if the power switch is on. The dimming controller is operable for adjusting the average current based on the switch monitoring signal. A current flows from the AC power source through the current path to ground when the power switch is off.
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