Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1985-07-30
1987-02-24
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
315408, 358190, H01J 2970
Patent
active
046459901
ABSTRACT:
A horizontal deflection circuit output stage is coupled to a first end terminal of a primary winding of a flyback transformer for developing at that terminal a retrace voltage. A second end terminal of the primary winding is coupled to a switched mode power supply that provides at the second end terminal a combined voltage that is the sum of a DC B+ scanning voltage component and a horizontal rate rectangular-wave voltage component. The difference voltage between the retrace voltage and the rectangular-wave voltage component is developed between the end terminals of the primary winding of the flyback transformer and is coupled by transformer action to a high voltage secondary winding for generating an ultor accelerating potential. The phase of the rectangular-wave voltage component relative to the retrace voltage determines the level of the ultor accelerating potential. The duty cycle of the rectangular-wave voltage component determines the DC B+ scanning voltage that controls the amplitude of the deflection current.
REFERENCES:
patent: 4227125 (1980-10-01), Bohringer
patent: 4516169 (1985-05-01), Truskalo
patent: 4524411 (1985-06-01), Willis
U.S. patent application Ser. No. 497,953, filed May 25, 1983, entitled Multiple Scan Rate Deflection Circuit Incorporating Scan Compensation, in the name of W. E. Babcock.
U.S. patent application Ser. No. 676,947, filed Nov. 30, 1984, entitled Raster Width Regulator Circuit, in the name of W. F. W. Dietz.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
RCA Corporation
Whitacre Eugene M.
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