Electricity: power supply or regulation systems – Remote sensing
Patent
1975-11-28
1977-06-21
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
323 56, 336110, 336178, 323 9, G05F 132, G05F 170
Patent
active
040314570
ABSTRACT:
A current limiter to protect circuit elements from excessive current caused by transient load impedance or power supply surges. A multiple branch element magnetic circuit includes at least one saturable branch element inductively coupled by a coil connected in series with the load of an external electric circuit. The magnetic circuit further includes low permeance bias branch element which biases the saturable branch element in a low permeance, saturated state when current through the coil is below a predetermined threshold value, and which biases at least one saturable branch element in its high permeance, non-saturated state when current through the coil is in a predetermined range above and extending from the threshold value. A relatively high permeance shunt branch element provides a shunt path for magnetic flux. The coil provides a relatively high inductive impedance in series with the external electrical circuit when at least one saturable element is in its non-saturated state and provides a relatively low impedance otherwise.
REFERENCES:
patent: 1788152 (1931-01-01), Dowling
patent: 2435062 (1948-01-01), Walsh
patent: 2844786 (1958-07-01), Van Urk et al.
patent: 2972715 (1961-02-01), Ringelman
Goldberg Gerald
The Charles Stark Draper Laboratory Inc.
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