Vertical deflection current generator

Details Vertical deflection current generator Vertical deflection current generator

1988-06-15

1989-11-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2970, H01J 2976

Patent

active

048840122

ABSTRACT:
A vertical deflection current generator includes an operational amplifier responsive to an input sawtooth signal at a vertical rate. A first end terminal of a deflection winding is coupled to an output terminal of the amplifier. A second end terminal of the deflection winding is coupled in series with a parallel arrangement of a switch and a capacitor. The switch is conductive during vertical trace. During vertical retrace, the switch is nonconductive that causes a vertical retrace voltage to develop in a flyback manner in the retrace capacitor. The retrace voltage in the retrace capacitor and a retrace voltage at the output terminal of the amplifier that are opposite in phase speed up the reversal of a deflection current in the deflection winding.

REFERENCES:
patent: 3784857 (1974-01-01), Christopher
patent: 3979641 (1976-09-01), Arakawa et al.
patent: 3993930 (1976-11-01), Fischman et al.
patent: 4024433 (1977-05-01), Korver
patent: 4238713 (1980-12-01), Moles
patent: 4694226 (1987-09-01), Wilber
Service Information for Monitors, Ref No. Mon 440-E of Barco Electronic NV, Belgium, the cover sheet dated Jun. 87.

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