CRT protective circuit

Details CRT protective circuit CRT protective circuit

1997-05-21

1999-05-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, 348378, H01J29/52

Patent

active

059031115

ABSTRACT:
A CRT protective circuit capable of eliminating spots during a mode conversion operation includes a microprocessor for generating a mute signal according to externally-provided horizontal and vertical sync signals, and a high voltage generating section for generating a high voltage according to an operation of a flyback transformer. A first switching section is switched according to the mute signal for supplying the high voltage of the high voltage generating section to a grid terminal, and a high voltage dropping section divides the output voltage of the high voltage generating section according to the switching status of the first switching section and supplies the dividing voltage to the grid terminal to control brightness of the spots. A second switching section is switched according to the mute signal for supplying an externally-supplied power supply, and a charging section charges/discharges an output voltage of the second switching section and supplies the backward potential of the discharging voltage to the grid terminal to eliminate the spots. Thus, the spots are eliminated during the mode converting operation to protect the CRT.

REFERENCES:
patent: 5184225 (1993-02-01), Heidebroek et al.
patent: 5682083 (1997-10-01), Shin

Affiliated with

Also associated with

Rating

CRT protective circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with CRT protective circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CRT protective circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-247520