Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate
2005-06-28
2005-06-28
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
C315S247000, C315S308000
Reexamination Certificate
active
06911786
ABSTRACT:
Two independent control variables, i.e. the frequency and the duty cycle of the driving waveform to an output driver, can be used to optimize the operation of a cold cathode fluorescent lamp (CCFL). The frequency of the driving waveform can be used to control the gain of a piezoelectric transformer (PZT) in a CCFL circuit. In contrast, the duty cycle of the driving waveform can be used to control the amplitude of the sinusoidal waveform at the PZT input terminal, and thus the current through the CCFL.
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Analog Microelectronics, Inc.
Bever Hoffman & Harms LLP
Tran Thuy Vinh
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