Automatic high-speed color CRT degaussing system

Details Automatic high-speed color CRT degaussing system Automatic high-speed color CRT degaussing system

1988-04-18

1988-11-08

Gellner, Michael L.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

315 8, H01F 1300, H01J 2906

Patent

active

047837152

ABSTRACT:
A degaussing system for a CRT includes a voltage source, which is enabled by power-up of the CRT, coupled to a tank circuit including a degaussing coil and a capacitor. A voltage sensing network connected in parallel with the tank circuit senses the voltage across the capacitor and when that voltage rises to a predetermined threshold, and actuating signal is provided which turns on a latching switch circuit which enables a switch connecting the tank circuit to ground. This allows it to oscillate, taking the metal components of the CRT through a decreasing series of hysteresis loops as the oscillation decays. The latching switch circuit maintains the switch in an on position until power-down of the CRT, thus maintaining all except R1 which aids grid regulation of the components of the degaussing system, in a low voltage state until degaussing becomes necessary once again.

REFERENCES:
patent: 4489253 (1984-12-01), Godawski
patent: 4737881 (1988-04-01), Haferl

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