Circuits and methods for controlling power of light sources
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United States of America Patent
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-
Dec 4, 2012
Grant Date -
Jun 16, 2011
app pub date -
Jun 25, 2010
filing date -
May 18, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A driving circuit for driving a light source includes a power converter, a controller and a voltage-controlled current source. The power converter is coupled to the light source, and receives an input voltage from a power source and provides an output voltage to the light source. The power converter includes a switch coupled in series with the light source. The controller is coupled to the power converter and controls a power of the light source by controlling the switch. The voltage-controlled current source is coupled to the controller and provides a first current. The controller controls the switch based on the first current.
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