Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1989-02-24
1990-10-23
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315408, H01J 2956, H01J 2970
Patent
active
049654969
ABSTRACT:
A deflection switch of a horizontal deflection circuit is coupled to a retrace resonant circuit that includes a horizontal deflection winding and a first retrace capacitance. A flyback transformer primary winding is coupled to a junction terminal of the deflection switch and the resonance circuit. An East-West modulation current is generated by a bidirectional second switch having a conduction time that is phase modulated during horizontal retrace at a vertical rate in a parabolic manner. The second switch is coupled in series with the first switch during the entire trace interval. To prevent an over-current condition when the current in the second switch exceeds a predetermined first level, the second switch is turned off and interrupts the flow of current through the deflection switch. Additionally, a diode is coupled between an intermediate terminal of the transformer primary winding and a junction terminal of the deflection and the second switches for preventing an overvoltage condition from developing across the second switch.
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patent: 4321513 (1982-03-01), Knight
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patent: 4780648 (1988-10-01), Haferl
patent: 4794307 (1988-12-01), Haferl
U.S. Patent Application, RCA Docket No. 85,011, entitled Raster Distortion Corrected Deflection Circuit, filed concurrently herewith.
Henig Sammy S.
Issing Gregory C.
Laks Joseph J.
RCA Licensing Corporation
Tipoli Joseph S.
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