Cold-cathode tube lighting circuit with protection circuit for p

Details Cold-cathode tube lighting circuit with protection circuit for p Cold-cathode tube lighting circuit with protection circuit for p

1998-10-15

2000-09-12

Wong, Don

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge control discharge device in the supply circuit

315307, 315224, 310316, H05B 3702

Patent

active

061182214

ABSTRACT:
To provide a cold-cathode tube lighting circuit which quickly and smoothly carries out lighting of a cold-cathode tube and prevents damage of a piezoelectric transformer as an inverter transform in the lighting circuit, the lighting circuit is provided with a protection circuit for detecting a primary current of the piezoelectric transformer. The protection circuit stops operation of an oscillator for driving the piezoelectric transformer when the primary current is excessive. The protection circuit may be provided to detect excess of a secondary voltage of the piezoelectric transformer. When the cold-cathode tube is used as a backlight for a liquid crystal display driven by the use of a scanning frequency, a dimmer circuit is used for producing a dimmer signal with a dimmer frequency and a controlled duty ratio given by a manual selector for controlling start and stop of the oscillator according to a desired brightness of the backlight. The dimmer frequency is obtained from frequency division of the scanning frequency. The controlled duty ratio is also modified corresponding to the divided frequency.

REFERENCES:
patent: 5731652 (1998-03-01), Shimada
patent: 5739622 (1998-04-01), Zaitsu
patent: 5739679 (1998-04-01), Takehara et al.
patent: 5796213 (1998-08-01), Kawasaki et al.
patent: 5886514 (1999-03-01), Iguchi et al.
patent: 5894184 (1999-04-01), Furuhashi et al.
patent: 5939840 (1999-08-01), Nakagawa
Patent Abstracts of Japan, vol. 096, No. 006, Jun. 28, 1996, JP 08033350 (Tamura Seisakusho Co. Ltd.), Feb. 2, 1996.
WO 9854934, Dec. 3, 1998, (Nihon Cement Kabushiki Kaisha).
EP 0 338 109 A, Oct. 25, 1989, (Zumtobel AG).

Affiliated with

Also associated with

Rating

Cold-cathode tube lighting circuit with protection circuit for p does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cold-cathode tube lighting circuit with protection circuit for p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cold-cathode tube lighting circuit with protection circuit for p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-98771