Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1994-11-18
1996-03-12
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
315 8, H04N 929
Patent
active
054991560
ABSTRACT:
A degaussing system for color monitors is disclosed. During a degaussing cycle, the system successively reverses the coupling in a bridge circuit between a degaussing coil and a storage capacitor so as to generate oppositely directed degaussing currents through the coil. To insure that the residual magnetism after degaussing is substantially zero, feedback signals are developed in a feedback circuit and applied through a control circuit to the bridge circuit to successively decrease the coil's current magnitudes until they reach a predetermined threshold. Simultaneously, the feedback signals are adjusted to cause the time-integrated current in one direction of the coil to substantially equal the time-integrated current in the other coil direction.
REFERENCES:
patent: 4737881 (1988-04-01), Haferl
patent: 4829214 (1989-05-01), Lendaro
patent: 5170096 (1992-12-01), Kang et al.
patent: 5287242 (1994-02-01), Kamimura
patent: 5404084 (1995-04-01), Onodera et al.
Denson-Low Wanda K.
Gaffin Jeffrey A.
Grunebach Georgann S.
Hughes Aircraft Company
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