Multiple scan rate deflection circuit incorporating scan compens

Details Multiple scan rate deflection circuit incorporating scan compens Multiple scan rate deflection circuit incorporating scan compens

1983-05-25

1985-08-20

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315408, H01J 2970

Patent

active

045366845

ABSTRACT:
A video display system operates at a plurality of horizontal scanning rates. A voltage source produces different voltage levels, one of which is selected in response to the horizontal rate selected. A horizontal deflection circuit produces retrace pulses having amplitudes dependent on the scanning rate. A high voltage transformer has a primary winding with a number of taps. The voltage source is connected to one of the taps in response to the horizontal deflection rate selected so that the high voltage level developed across the transformer secondary winding remains substantially constant independent of changes in retrace pulse amplitude.

REFERENCES:
patent: 3784872 (1974-01-01), James
patent: 4302708 (1981-11-01), Spilsbury
Schematic Diagram of Conrac Video Monitor Scan Board, dated 3/17/81.
Conrac Technical Manual 7111/7211 RGB Color Monitor, May 1, 1982, pp. 3-11 to 3-16 and 3-35 to 3-47, Including Schematic Diagrams of Scan Board and High Voltage Regulator Board.

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