Variable horizontal deflection circuit capable of providing east

Details Variable horizontal deflection circuit capable of providing east Variable horizontal deflection circuit capable of providing east

1982-09-29

1984-01-31

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

044292570

ABSTRACT:
A controllable switch operated at the horizontal deflection rate is coupled to a horizontal deflection winding to generate scanning current during a trace interval of a deflection cycle. A deflection retrace capacitor forms a retrace resonant circuit with the deflection winding during the retrace interval. A supply inductance such as a winding of a horizontal output transformer is coupled either conductively or magnetically to a source of supply energy. A second capacitor is coupled to the supply inductance and to the controllable switch and forms a second resonant circuit with the supply inductance within the retrace interval to generate a pulse voltage. The pulse voltage energizes a load circuit such as the ultor high voltage circuit. A modulation inductance is coupled to a source of modulation signals and to the deflection winding and supplies a modulation current to the retrace resonant circuit to modulate the amplitude of the scanning current without modulating the amplitude of the supply inductance pulse voltage. The modulation may occur at a vertical rate to provide east-west pincushion distortion correction.

REFERENCES:
patent: 3879636 (1975-04-01), Lamoureux
patent: 3906305 (1975-09-01), Nillesen
patent: 4140949 (1979-02-01), Terry
patent: 4182978 (1980-01-01), Boekhorst
patent: 4225809 (1980-09-01), Ogawa et al.
"Chassis CTC101 Series", File 1979 C7, (p. 1 and pp. 41-43).
RCA Television Workshop-20, "Servicing the CTC 99 and 101 Color Chassis," copyright 1979 (pp. 1, 3, 65-67).

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