Degaussing circuit with residual current cutoff

Details Degaussing circuit with residual current cutoff Degaussing circuit with residual current cutoff

1985-09-30

1988-05-03

Dixon, Harold

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315 1, H01J 2906

Patent

active

047422700

ABSTRACT:
A degaussing circuit for a video display apparatus eliminates residual degaussing current flow during operation of the video display apparatus. A capacitor is connected between coil of the degaussing relay and the source of energizing voltage. Application of the energizing voltage to the relay coil energizes the relay and initiates degaussing of the cathode ray tube of the video display apparatus, and also causes the capacitor to begin charging. As the capacitor becomes charged, the degaussing relay becomes deenergized, thereby terminating degaussing current flow. The capacitor charging time constant is selected to allow sufficient time for degaussing to occur before deenergization of the degaussing relay.

REFERENCES:
patent: 2962622 (1960-11-01), Popovich
patent: 3249795 (1966-05-01), Dietch
patent: 3582721 (1971-06-01), Van Hoorn
patent: 3733524 (1973-05-01), Cooksey et al.
patent: 4295078 (1981-10-01), Wilmarth

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