Focus voltage circuit for television apparatus

Details Focus voltage circuit for television apparatus Focus voltage circuit for television apparatus

1985-03-25

1987-02-17

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, H01J 2958, H01J 2970

Patent

active

046442308

ABSTRACT:
The retrace pulse voltage developed by a horizontal deflection generator is applied to the primary winding of a flyback transformer. The voltage across a high voltage winding of the flyback transformer is rectified and filtered to produce an intermediate, DC high voltage. The voltage developed across the flyback transformer primary winding produces a leakage flux that links the winding turns of a coil in a dynamic focus circuit. The coil and a capacitor form an LC resonant circuit that waveshapes the induced voltage in the coil to produce a sinusoidal or an approximately parabolically shaped horizontal frequency voltage. The intermediate DC high voltage and the parabolically shaped horizontal frequency voltage are summed to produce the focus voltage.

REFERENCES:
patent: 4316128 (1982-02-01), Shiratsuchi

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