CRT horizontal deflection circuit enabling horizontal sweep widt

Details CRT horizontal deflection circuit enabling horizontal sweep widt CRT horizontal deflection circuit enabling horizontal sweep widt

1986-10-22

1989-01-31

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, 358243, H01J 2970, H01J 2976

Patent

active

048018520

ABSTRACT:
A horizontal deflection circuit for performing horizontal sweep operation of a CRT includes a saturable reactor having controlled windings connected through the primary winding of a flyback transformer to the CRT horizontal deflection coil, to supply deflection current thereto from a voltage supply produced from a voltage control circuit. The level of this supply voltage is controlled by feedback operation in accordance with the amplitude of pulses produced from an output winding of the flyback transformer such as to maintain this pulse amplitude at a fixed value, and hence maintain an EHT voltage derived from pulses from a secondary winding of the transformer at a fixed value. These fixed values are held constant when a DC current passed through the reactor control winding is varied to adjust the inductance of the controlled windings, and thereby adjust the horizontal sweep width produced on the CRT screen.

REFERENCES:
patent: 3970780 (1976-07-01), Minoura
patent: 4209731 (1980-06-01), Miko et al.

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