Line output circuit for generating a line frequency sawtooth cur

Details Line output circuit for generating a line frequency sawtooth cur Line output circuit for generating a line frequency sawtooth cur

1985-10-16

1987-08-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, 315408, H01J 2970

Patent

active

046864318

ABSTRACT:
A line deflection circuit in which a transistor (TR) conducts during the scan period to produce a sawtooth current though the line deflection coil (Ly), transistor (TR) being rendered non-conducting at the scan period to initiate the flyback period which may be required to be short (of the order of 6 microseconds). During flyback the circuit is tuned to produce a half sinewave which determines the flyback period and to an odd harmonic (3rd or 5th) of the fundamental for the flyback period. A change in inductance of the width control inductor (L1) will produce a change in the flyback period while a simultaneous change in the inductance of the inductor (L2) will produce a change in the leakage inductance of the transformer (T) to change the frequency of the desired odd harmonic to ensure that the odd harmonic has the desired relationship with the flyback period. Overcomes display modulation that would otherwise be produced.

REFERENCES:
patent: 2702874 (1955-02-01), Adler
patent: 2871405 (1959-01-01), Vonderschmitt
patent: 3769542 (1973-10-01), Pieters
patent: 3906303 (1975-09-01), Gerritsen
patent: 4144479 (1979-03-01), Farina et al.
patent: 4334173 (1982-06-01), Gabriel et al.

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