Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1985-12-12
1987-08-18
Gellner, Michael L.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
123490, F02B 300, F02M 700, H01H 4732
Patent
active
046881395
ABSTRACT:
A device for driving an electromagnet from a direct current source includes first and second circuits which are coupled in parallel to each other, and in parallel to a direct current source. The first circuit has a first switch, a solenoid coil, and a second switch all in series with one another. The second circuit has a third switch, a storage coil, and a fourth switch all in series with one another. A third circuit is provided which has a diode which is arranged to provide a current path from a junction between the storage coil and the fourth switch, to a junction between the first switch and the solenoid coil. In operation, during solenoid standby, the choke coil is caused to store electromagnetic energy. When the solenoid coil is energized, the switches are operated such that the energy stored in the storage coil is caused to quickly charge into the solenoid coil. The solenoid coil is maintained energized by operating the first switch in a chopper mode. To deenergize the solenoid coil, the switches are operated so that the energy in the solenoid coil is discharged into the storage coil. In this way, rapid deenergization is possible.
REFERENCES:
patent: 4291358 (1981-09-01), Dettmann et al.
patent: 4319301 (1982-03-01), Hill
patent: 4377144 (1983-03-01), Takahashi
patent: 4599674 (1986-07-01), Ishikawa et al.
Kajima Takashi
Nagata Osamu
Ozaki Toshihara
Gellner Michael L.
Technological Research Association of Highly Reliable Marine Pro
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