Television receiver focus voltage circuit

Details Television receiver focus voltage circuit Television receiver focus voltage circuit

1980-06-13

1982-02-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315382, H01J 2970

Patent

active

043161286

ABSTRACT:
The retrace pulse voltage developed by a horizontal deflection generator is applied to the primary winding of a flyback transformer. The voltage at an intermediate point of the flyback transformer high voltage winding is rectified and filtered to produce an intermediate, DC high voltage. A pulse forming circuit is coupled to a secondary winding of the flyback transformer to produce voltage pulses repeating at the horizontal deflection frequency. The amplitude of the pulses is parabolically modulated at a vertical rate. The amplitude modulated pulses are rectified and filtered to produce a parabolically shaped vertical frequency voltage. The voltage developed across another flyback transformer secondary winding is waveshaped by an LC resonant circuit to produce a sinusoidal or a substantially parabolically shaped horizontal frequency voltage. The intermediate DC high voltage and the parabolically shaped vertical and horizontal frequency voltages are summed to produce the focus voltage.

REFERENCES:
patent: 2918602 (1959-12-01), Fyler et al.
patent: 3146373 (1964-08-01), Janssen
Electrical Schematic of Sony Television Model KV-1813 published 9-15-72.

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