Dynamic focussing circuit for cathode ray tube and transformer f

Details Dynamic focussing circuit for cathode ray tube and transformer f Dynamic focussing circuit for cathode ray tube and transformer f

1991-11-27

1992-11-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2958

Patent

active

051627051

ABSTRACT:
A diode modulation circuit provides a horizontal yoke coil current which is modulated in a manner to correct for side pin cushion distortion in the resultant CRT television picture tube display. The modulation circuit includes two parallel capacitance-inductance resonant circuits coupled in series. One coil of the parallel resonant circuits is the horizontal yoke coil of the picture tube. A modulation circuit is applied to the coil of the other parallel resonant circuit to generate a modulation current in the yoke coil. The modulation current flowing through the yoke coil is applied to the primary winding. Another modulated current in the diode modulator circuit is applied to a secondary winding of a transformer, the windings being coupled to each other via a common core. The turns ratio of the primary winding to the secondary winding of the transformer are such as to add the fluxes generated by the windings to produce a net flux in the transformer core that exhibits negligible modulation. A ramp current of constant maximum amplitude is induced in the output winding of the transformer by that flux and is applied to an output capacitor circuit for producing an unmodulated periodic parabolic voltage for driving the focusing grid of the CRT.

REFERENCES:
patent: 3906303 (1975-09-01), Gerritsen
patent: 3906305 (1975-09-01), Nillesen
patent: 3944884 (1976-03-01), Wilocki
patent: 4642530 (1987-02-01), Rodriguez-Cavazos
patent: 5071161 (1991-12-01), Ikeda et al.

Affiliated with

Also associated with

Rating

Dynamic focussing circuit for cathode ray tube and transformer f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dynamic focussing circuit for cathode ray tube and transformer f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic focussing circuit for cathode ray tube and transformer f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2296327