Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1993-10-14
1996-06-11
Fleming, Fritz M.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361150, 361267, H01F 1300
Patent
active
055262210
ABSTRACT:
A degaussing circuit comprising a rectifying circuit for rectifying an AC voltage inputted therein into a DC voltage, a capacitor for smoothing the DC voltage from the rectifying circuit, a RC charging circuit for charging with the DC voltage smoothed by the capacitor, a positive temperature coefficient resistor having a resistance which is increased with an increase in a temperature due to an AC current flowing therethrough upon power supply, a degaussing coil for removing a magnetic field in response to the AC current flowing through the positive temperature coefficient resistor thereto, a relay for controlling the flow of the AC current through the positive temperature coefficient resistor to the degaussing coil, and a relay driving circuit for controlling an ON/OFF state of the relay in response to the voltage charged on the RC charging circuit. A transistor in the relay driving circuit is turned off by the voltage charged on the charging circuit as the resistance of the positive temperature coefficient resistor rises due to the AC current after the lapse of a predetermined time period from a point of time of the power supply and the relay is turned off as the transistor is turned off. Therefore, no current flows through the degaussing coil although the resistance of the positive temperature coefficient resistor is reduced as the temperature falls.
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patent: 5170096 (1992-12-01), Kang et al.
patent: 5241448 (1993-08-01), Stolte
patent: 5357398 (1994-10-01), Kamijoh
Fleming Fritz M.
Goldstar Electron Co. Ltd.
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