Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1984-12-19
1986-08-12
Gellner, Michael L.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
123490, H01H 4732, F02D 4130
Patent
active
046059830
ABSTRACT:
A drive circuit for an electromagnetic device including a solenoid includes a transistor in series with the solenoid and a current sensing resistor. A comparator receives a voltage signal depending on the current flow in the solenoid and by way of an "AND" gate renders the transistor conductive when a control signal appears and non conductive when the current flow exceeds a set value. A first monostable circuit modifies a reference voltage applied to the comparator and reduces the set value of the current after a predetermined time so that the solenoid is initially energised at a high current value which is then reduced to a holding value. The circuit includes a second monostable circuit which causes the transistor to be switched on and off when the current has attained the high value and when the current is at its holding value.
REFERENCES:
patent: 4327394 (1982-04-01), Harper
Gellner Michael L.
Lucas Industries Public Limited Company
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