Power on demand beam deflection system for dual mode CRT display

Details Power on demand beam deflection system for dual mode CRT display Power on demand beam deflection system for dual mode CRT display

1986-06-27

1987-12-08

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315396, 315387, 315389, 315364, H01J 2970

Patent

active

047120479

ABSTRACT:
A cathode ray beam deflection system operable in slew and random stroke and periodic raster display modes provides automatic power supply voltage switching to maintain linear operation and high efficiency. Control of automatic switching is obtained by continuously monitoring yoke voltage, yoke current, and deflection voltage, a power supply voltage being switched to a voltage of higher magnitude to provide a higher deflection rate when the yoke voltage exceeds a predetermined level at a predetermined current polarity and returned to a power supply voltage of lower magnitude when the higher deflection rate is no longer required.

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