Beam current compensated vertical size control

Details Beam current compensated vertical size control Beam current compensated vertical size control

1988-08-08

1989-12-05

Tarcza, Thomas H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315387, H01J 2970

Patent

active

048855103

ABSTRACT:
A compensation circuit for maintainng a CRT vertical raster size substantially constant with beam current changes includes a sensing resistor connected in series with the high voltage winding. The sensing resistor develops an input bias for a compensation transistor that has its output circuit connected across the vertical size control. Increases in beam current are reflected in increases in current in the high voltage winding which cause the compensation transistor to conduct more heavily and supply more current to the vertical size control. The size control is part of the discharge circuit of the vertical timing capacitor and the increased current from the transistor reduces the discharge time of the timing capacitor. Consequently the peak to peak voltage of the vertical current ramp is decreased.

REFERENCES:
patent: 4147963 (1979-04-01), Shiotani
patent: 4645987 (1987-02-01), Kiteley et al.
patent: 4649325 (1987-03-01), Guerin et al.

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