Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2005-03-08
2005-03-08
Lee, Wilson (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S2090PZ, C315S224000
Reexamination Certificate
active
06864644
ABSTRACT:
Method of tuning a drive circuit for a cold cathode fluorescent lamp (CCFL). The drive circuit includes a piezoelectric transformer coupled to an output of first and second transistors. The frequency of drive signals to the first and second transistors are varied until about a ninety degree phase relationship is achieved between the frequency of the drive signals and a frequency of voltage across a resistor connected to the CCFL is achieved. Alternatively, the frequency of the drive signals provided to the first and second transistor is adjusted as needed to achieve maximum output voltage.
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