Raster centering circuit

Details Raster centering circuit Raster centering circuit

1975-07-30

1977-06-28

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315368, 315 13C, H01J 2954

Patent

active

040328198

ABSTRACT:
A convergence circuit coupled in parallel with a deflection winding are AC coupled to an output terminal of a deflection amplifier. Rectifiers in the convergence circuit are poled such that the deflection amplifier output current is assymmetrically loaded during the trace portion of each deflection cycle, causing a net direct current of a first polarity through the deflection winding which off-centers the raster. A direct current path coupled in shunt with the yoke coupling capacitor permits conduction of a direct current of a second polarity through the deflection winding for controlling the centering of the raster.

REFERENCES:
patent: 3510723 (1970-05-01), Dumas
patent: 3849696 (1974-11-01), Peter et al.
patent: 3882350 (1975-05-01), Hall

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