Systems and methods for controlling brightness of cold-cathode fluorescent lamps with wide dimming range and adjustable minimum brightness
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United States of America Patent
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May 27, 2014
Grant Date -
Jun 13, 2013
app pub date -
Feb 7, 2013
filing date -
Jun 24, 2010
priority date (Note) -
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Abstract
System and method for adjusting brightness of one or more cold-cathode fluorescent lamps. The system includes a voltage selector configured to receive a dimming voltage and a first threshold voltage and generate an output voltage. The output voltage is selected from a group consisting of the dimming voltage and the first threshold voltage. Additionally, the system includes an oscillator coupled to a first capacitor and configured to generate a ramp signal with the first capacitor, and a signal generator configured to receive the ramp signal and the output voltage and generate a first signal. The first signal corresponds to a lamp brightness level. Moreover, the system includes a brightness detector configured to receive the first signal and output a second signal. The second signal indicates whether the lamp brightness level is higher than a threshold brightness level.
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