Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1983-07-14
1985-08-27
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361103, 324105, H02H 504
Patent
active
045381992
ABSTRACT:
A resistance wire sensing overcurrent protection module (CSM) for an electrical supply circuit (SC) having a hot temperature sensing diode (32) mounted at the center portion (8c) of an M-shaped resistance wire (8) connected in the supply circuit and an ambient temperature sensing diode (20) mounted on a substrate (18) supported between the supply terminals (4a-b, 6a-b), both diodes being connected to respective pairs of terminals (12a-b, 10a-b) mounted on a header (18) along with the supply terminals. A cover (46) is mounted on the header and filled with glass micro-balloons (48) to isolate thermally the two diodes. A constant current circuit (49) supplies constant current to the two diodes which operate a differential amplifier (52) having an output proportional to the temperature difference as a measure of supply current. This output trips a Schmitt trigger comparator (54) when the supply current rises to an overload value.
REFERENCES:
patent: 3696294 (1972-10-01), Krupka
patent: 3794950 (1974-02-01), Kilner
patent: 4004462 (1977-01-01), Dobkin
Bielinski Ralph F.
Chacon M. Frank
Kramer Dennis M.
Mathias William R.
Schneider Stanley
Autio Wm. A.
Eaton Corporation
Grace C. H.
Moose Jr. Harry E.
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