Television vertical deflection circuit

Details Television vertical deflection circuit Television vertical deflection circuit

1977-08-08

1979-01-02

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, H01J 2970, H01J 2972

Patent

active

041329295

ABSTRACT:
A saw-tooth wave generator including thyristors is provided in the vertical deflection circuit, the thyristors controlling charging and re-charging of a charge capacitor. A portion of the energy contained in the line retrace and delivered from the horizontal output stage is used in order to provide current for the vertical deflection coil. In order to prevent spurious or erroneous operation of the thyristors, an oppositely poled bias voltage is applied to the gates of the thyristors during the pauses or intervals of triggering of the thyristors, the bias voltage being derived externally or directly from the thyristor control circuit, for example by utilizing the inductive reverse-polarity kick of an inductance connecting the thyristor gate to its control circuit, by a charge-reverse re-charge circuit of a capacitor, or the like.

REFERENCES:
patent: 3993931 (1976-11-01), Den Hollander
patent: 4037137 (1977-07-01), Dietz
patent: 4048544 (1977-09-01), Haferl

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