Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1978-11-02
1980-02-26
Hubler, Malcolm F.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315411, H01J 2970
Patent
active
041907914
ABSTRACT:
A horizontal deflection circuit drives a deflection winding and an ultor voltage generator. The energizing voltage for the horizontal deflection generator is regulated by a switching regulator including an SCR, a filter inductor, a filter capacitor and an SCR turn-off winding. The turn-off winding couples a retrace pulse to the SCR during each horizontal retrace interval to turn the SCR off in preparation for the following regulation interval. A second winding is magnetically coupled to the deflection circuit and through a diode to the filter inductor for providing a path by which current can continue to flow in the filter inductor during SCR nonconduction and which effectively couples the filter inductance across the deflection winding. Variations in kinescope beam current cause corresponding variations in the current through the filter inductor at the end of the trace interval. The current variations in the filter inductor cause the diode to become nonconductive at times during the retrace interval which are related to the beam current, thereby changing the average time during which the filter inductor parallels the deflection winding and varying the retrace pulse duration in such a manner as to improve the ultor voltage generator regulation.
REFERENCES:
patent: 3235766 (1966-02-01), Martin et al.
patent: 3970780 (1976-07-01), Minoura
patent: 4081722 (1978-03-01), Haferl
patent: 4099101 (1978-07-01), Teuling
patent: 4147964 (1979-04-01), Luz et al.
Hubler Malcolm F.
Meise William H.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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