Side pincushion correction circuit with automatic picture tracki

Details Side pincushion correction circuit with automatic picture tracki Side pincushion correction circuit with automatic picture tracki

1987-01-06

1988-03-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

047331402

ABSTRACT:
A side pincushion correction circuit develops a vertical rate parabolic signal by multiplication of the vertical ramp by itself. A transistor current source is connected to a gain control terminal of a multiplier and is controlled by the operating voltage developed for the horizontal deflection system. A tilt potentiometer supplies a variable amplitude and polarity voltage to the multiplier. A potentiometer is coupled to the output of the multiplier. The tilted, variable amplitude parabolic signal is coupled to an error amplifier that is differentially supplied with a sinewave signal developed by integrating the parabolic signal. The error amplifier controls the voltage regulator that supplies operating voltage to the horizontal deflection system.

REFERENCES:
patent: 4216392 (1980-08-01), Valkestijn
patent: 4496882 (1985-01-01), Oliver et al.

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