Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1997-01-29
1998-02-03
Fleming, Fritz
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361150, 361267, H01F 1300
Patent
active
057151300
ABSTRACT:
A demagnetization circuit controls a demagnetization current to its demagnetization coil by means of a PTC thermistor with positive characteristic. The PTC thermistor is connected in series with and thermally coupled to a heat-sensitive switch. An NTC thermistor with negative characteristic for suppressing rush current of the voltage source is also thermally coupled to the heat-sensitive switch. After a power switch is closed, the heat-sensitive switch is opened by the heat emitted from the PTC thermistor and remains open by the heat from the NTC thermistor. The two thermistors and the heat-sensitive switch are contained in a case for easy handling and to make the component compact.
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patent: 3617800 (1971-11-01), Ishikawa
patent: 3619703 (1971-11-01), Yamashita et al.
patent: 3896330 (1975-07-01), Chamberlain
patent: 4164775 (1979-08-01), Slegers
patent: 4357590 (1982-11-01), Belhomme
patent: 4504817 (1985-03-01), Shikama et al.
patent: 5241448 (1993-08-01), Stolte
Fleming Fritz
Murata Manufacturing Co. Ltd.
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