Resonant degaussing apparatus

Details Resonant degaussing apparatus Resonant degaussing apparatus

1987-07-30

1988-03-29

Dixon, Harold

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315 1, 315244, 361267, H01J 2906

Patent

active

047346205

ABSTRACT:
First and second capacitors are charged prior to a degaussing interval. A first switch couples the first capacitor to a degaussing coil to initiate the degaussing interval. The first capacitor and the degaussing coil form a resonant circuit that resonates to generate a decaying degaussing current. During a predetermined portion of each cycle of the degaussing current, a second switch couples a precharged second capacitor in parallel with the first capacitor to form a charge transfer arrangement that transfers charge from the second to the first capacitor for replenishing energy losses in the first capacitor. The charge transfer arrangement increases the duration of the time it takes to the amplitude of the degaussing current to decay and, hence, the length of the degaussing interval.

REFERENCES:
patent: 3733524 (1973-05-01), Cooksey et al.
patent: 4384313 (1983-05-01), Steingroever et al.
patent: 4489253 (1984-12-01), Godawski
patent: 4535270 (1985-08-01), Frantz et al.
patent: 4636911 (1987-01-01), Truskalo

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