Dynamic focussing signal power amplifier for magnetically focuss

Details Dynamic focussing signal power amplifier for magnetically focuss Dynamic focussing signal power amplifier for magnetically focuss

1992-01-28

1992-09-08

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 60, H01J 2958

Patent

active

051461420

ABSTRACT:
A single power amplifier is provided both the horizontal and vertical focussing coils of each CRT of a red, blue and green CRT projection television system. Each amplifier includes an amplitude adjustment network to minimize spot size, an adder circuit for superimposing horizontal and vertical parabolic focussing voltages and a power amplifier stage for amplifying the superimposed voltages. The amplifier stage includes a differential amplifier comparator for converting with high gain the horizontal superimposed parabolic voltage into a saw tooth voltage superimposed on a vertical parabolic voltage which is applied to the vertical focussing coil. A passive capacitive filter filters out the vertical parabolic voltage, applies only the filtered saw tooth voltage to a transformer for stepping up the voltage. The stepped up saw tooth voltage is then applied to the horizontal focussing coil. The parabolic currents from the coils are combined and fed back to the differential amplifier as one input after conversion to a superimposed feedback voltage for comparison to the adjusted superimposed voltages from the adder circuit applied as a second input.

REFERENCES:
patent: 3906303 (1975-09-01), Gerritsen
patent: 3906305 (1975-09-01), Nillesen
patent: 4395662 (1983-07-01), Sexton, Jr.
patent: 4485335 (1984-11-01), Eames, Jr.
patent: 4546291 (1985-10-01), Morioka et al.
patent: 4555649 (1985-11-01), Sharma
patent: 4644230 (1987-02-01), Federle
patent: 4707639 (1987-11-01), Truskalo

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