Primary-side driving control circuit for backlight of LCD panel
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United States of America Patent
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-
Aug 16, 2011
Grant Date -
Dec 18, 2008
app pub date -
May 1, 2008
filing date -
Jun 13, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention discloses a primary-side driving backlight circuit for LCD panel. The primary-side driving backlight circuit employs a single isolation device to achieve isolation request for safety for the secondary side. The PWM controller on the secondary-side of a transformer generates a control signal according to a feedback signal. The control signal is transmitted by the isolation device to a High/Low side driver. The High/Low side driver has a High Output and a Low Output, which drives power switches at high side and low side respectively, in order to control the power of an input source transmitting into the transformer and further control the voltage and current of cold cathode lamp(s) of a backlight circuit.
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