LIGHT EMITTING ELEMENT DRIVING CIRCUITS WITH DIMMING FUNCTION AND CONTROL METHODS THEREOF
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United States of America Patent
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Issued Date -
Nov 7, 2013
app pub date -
May 2, 2013
filing date -
May 4, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A controller used in a light emitting element driving circuit, wherein the light emitting element driving circuit has a power converter configured to provide an output current for the light emitting element. The controller has a dimming processing unit and a current control unit. The dimming processing unit is configured to receive a first dimming signal with a first duty cycle and a second dimming signal with a second duty cycle, and to generate a second dimming processing signal relative to the product of the first duty cycle and the second duty cycle. The current control unit is coupled between the dimming processing unit and the power converter, and is configured to generate a control signal for the power converter based on the second dimming processing signal and a feedback signal indicating the output current.
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