Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1991-05-03
1992-05-05
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
358190, 358243, H01J 2970
Patent
active
051111225
ABSTRACT:
A television receiver high voltage generator includes a high voltage transformer for developing an ultor accelerating potential at an ultor output terminal. A flyback voltage produced in a winding of the transformer is rectified to produce an ultor accelerating potential representative DC voltage. A high voltage protection circuit comprises a comparator/amplifier stage that level shifts the ultor accelerating potential representative DC voltage and applies the level shifted voltage across a base-emitter junction of a first transistor. The first transistor is coupled to a second transistor to form a latch. When, as a result of excessive ultor accelerating potential, the latch becomes active, the generation of the ultor accelerating potential is disabled. The first and second transistors are interior to an integrated circuit; whereas, the comparator/amplifier stage is exterior to the integrated circuit.
REFERENCES:
patent: 4335335 (1982-06-01), Willis
patent: 4389676 (1983-06-01), Balaban et al.
patent: 4562508 (1985-12-01), Chen et al.
A Service Manual for Goldstar Chassis NC-95A, Models CMT-4842N & CMT-9842X, dated Jul. 1989, front & back pages & Pg. of FIG. 8.
A Service Manual RCA/GE Color TV Basic Service data for CTC169 (DV) chassis, dtd. 1990, cover pg., pp. 1-22 & pp. 2-4.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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