Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1988-04-20
1989-03-14
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
358190, 358243, H01J 2970
Patent
active
048127191
ABSTRACT:
A switch regulator includes a controllable SCR switch that is coupled in series with a filter inductor and a horizontal deflection generator, and the series combination is coupled across a source of unregulated direct voltage for providing a path for an increasing current flow in the inductor during a portion of a trace interval in which the switch is closed. Horizontal rate signals are coupled from the deflection generator to the switch via a first winding for controlling the opening of the switch. A catch diode is coupled to the filter inductor to form a path for a decreasing current flow in the first inductor during at least a portion of a retrace interval. The first winding is coupled in series with a second inductor to form an arrangement that is coupled between the unregulated voltage and the SCR switch. A current in the second inductor maintains the switch conductive during a portion of retrace that varies in accordance with a beam current for improving regulation of an ultor voltage.
REFERENCES:
patent: 4163926 (1979-08-01), Willis
patent: 4190791 (1980-02-01), Hicks
patent: 4298829 (1981-11-01), Luz
patent: 4321514 (1982-03-01), Thibodeau et al.
A schematic of a PC-B Television Receiver Chassis dated 4/83, published by General Electric, Television Product Service, Portsmonth, Va.
Boyer Michael E.
Smith Lawrence E.
Stephens Joseph C.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
Rasmussen Paul J.
Thomson Consumer Electronics Inc.
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