Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1985-10-31
1987-07-07
Gellner, Michael L.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361194, H01H 4732
Patent
active
046791167
ABSTRACT:
A current controlling device comprises an input circuit for receiving a driving signal, means for supplying a first reference voltage or a second reference voltage lower than the first reference voltage, a detecting resistor for detecting current flowing through an electromagnetic winding, and means for supplying the electromagnetic winding with a starting current and a holding current. The starting current initially rises then is maintained at a constant value based upon the detected voltage of the detecting resistor and the first reference voltage. The second reference voltage is supplied in place of the first reference voltage after a predetermined period of time and continues to be supplied until the driving signal ends. The holding current is maintained at a constant value lower than said constant value of the starting current based upon the detected voltage and the second reference voltage. Both the first and second reference voltages are controlled to be constant voltages.
REFERENCES:
patent: 4345296 (1982-08-01), Breitling
patent: 4358812 (1982-11-01), LoCascio et al.
patent: 4452210 (1984-06-01), Sasayama et al.
patent: 4473861 (1984-09-01), Kosak et al.
patent: 4516185 (1985-05-01), Culligan et al.
patent: 4536818 (1985-08-01), Nielsen
Kondoh Masami
Oshizawa Hidekazu
Diesel Kiki Co. Ltd.
Gellner Michael L.
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