Deflection system with overscan protection

Details Deflection system with overscan protection Deflection system with overscan protection

1975-02-10

1976-02-24

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, 315395, H01J 2956

Patent

active

039406610

ABSTRACT:
In a deflection system including an oscillator and an amplifier providing scanning current for a deflection winding, a parabolic voltage developed at the deflection winding is superimposed on the oscillator direct current operating voltage in such a proportion that an increased parabolic voltage level, indicative of excessive scanning current from either an overscan or low operating frequency condition, causes the oscillator to operate at a higher frequency which decreases the deflection winding current and therefore the parabolic voltage and thereby permits the use of less expensive circuit components having lower maximum voltage level ratings.

REFERENCES:
patent: 3648099 (1972-03-01), Otten et al.
patent: 3649870 (1972-03-01), Maulsby

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