Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1976-08-30
1978-09-12
Goldberg, Gerald
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361194, 361210, H01H 4704, H01H 4732
Patent
active
041141849
ABSTRACT:
Control system for an electromagnet having a movable core, wherein a power winding is provided for moving the core to active position and a holding winding requiring less power maintains the core in active position. A transistor controls the power supply circuit and, when made conductive, energizes a transistor in series with each winding, thus energizing both windings. After a time delay provided by a resistor-condenser circuit, another transistor is energized which causes the transistor in the power winding to become non-conductive, thus de-energizing the power winding. De-energizing the control transistor causes the transistor in the maintenance winding to become non-conductive so that the maintenance winding is de-energized and its energy is dissipated through a Zener diode and a resistor, both in series therewith.
REFERENCES:
patent: 3456164 (1969-07-01), Sternberg
patent: 3660730 (1972-05-01), Mason
patent: 3689808 (1972-09-01), Stampfli
patent: 3737736 (1973-06-01), Stampfli
patent: 3786314 (1974-01-01), Misch
patent: 3852646 (1974-12-01), Mason
Goldberg Gerald
Groff, Jr. Emory L.
Lucifer S.A.
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