Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate
2006-04-04
2006-04-04
Vo, Tuyet (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
Reexamination Certificate
active
07023142
ABSTRACT:
A method and apparatus for modulating light of CCFLs that couples frequency alteration and pulse width modulation (PWM) approaches to change output voltage and current of a piezoelectric transformer to modulate the luminosity of a CCFL. The invention includes a PWM controller to alter operation cycle and a frequency control IC to change resonant frequency that drives the piezoelectric transformer at different operation cycles thereby to modulate the luminosity of the CCFL and improve the life span of the piezoelectric transformer.
REFERENCES:
patent: 5859489 (1999-01-01), Shimada
patent: 6016052 (2000-01-01), Vaughn
patent: 6400096 (2002-06-01), Wells et al.
patent: 6525492 (2003-02-01), Ribarich
patent: 6853153 (2005-02-01), Gray
patent: 504101 (2002-09-01), None
Cheng Eddie
Chou Chin-Wen
Chung Chin-Biau
Wu Kuang-Ming
A Minh Dieu
Birch & Stewart Kolasch & Birch, LLP
Vo Tuyet
Zippy Technology Corp.
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