Linearity corrected deflection circuit

Details Linearity corrected deflection circuit Linearity corrected deflection circuit

1980-08-04

1982-03-23

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, H01J 2970, H01J 2972

Patent

active

043215114

ABSTRACT:
An inverter coupled to a source of DC input voltage is operated at the horizontal deflection frequency for developing a horizontal rate square-wave supply voltage. A power transformer having a first winding excited by the square-wave supply voltage develops a horizontal rate alternating polarity output voltage across second and third windings. A horizontal deflection generator is coupled to the second winding and is energized thereby to develop a trace voltage across a race capacitor. The deflection generator includes a trace switch coupled across the series arrangement of a horizontal deflection winding, the trace capacitor and the power transformer third winding. The trace switch is operated at a horizontal rate to generate horizontal deflection or scanning current in the deflection winding. A phase control circuit phases the alternating polarity output voltage relative to the phasing of the horizontal scanning current so as to apply a greater magnitude voltage across the horizontal deflection winding during the last half of the trace interval of each deflection cycle than during the first half of the trace interval. In this manner, linearity correction of the horizontal scanning current is obtained.

REFERENCES:
patent: 3192433 (1965-06-01), Schneider
patent: 3434001 (1969-03-01), Okuda
patent: 3796911 (1974-03-01), Ensor et al.
patent: 3891800 (1975-06-01), Janssen et al.
patent: 4024432 (1977-05-01), Boekhorst

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