Electrothermal wire responsive miniature precision current senso

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor

Patent

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Details

Other Related Categories

361103, 324105, H02H 504

Type

Patent

Status

active

Patent number

045381992

Description

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

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