Communications: electrical – Selective – Having indication or alarm
Patent
1980-06-26
1983-05-24
Strecker, Gerard R.
Communications: electrical
Selective
Having indication or alarm
324 51, 340642, G01R 3102, G01R 1915
Patent
active
043852831
ABSTRACT:
Process for monitoring the instantaneous or momentary state of an electric circuit having to function in a range limited to two states, namely a normal state corresponding to the passage of a nominal intensity in a conductor and a critical or threshold state corresponding to a threshold intensity and in particular a zero intensity in the said conductor, using the detection of possible variations in the resistance of a magnetic layer or "magnetoresistor" of the influence of the magnetic field due to the intensity of the electric current circulating in a conductor and whereof part of the path is located in the vicinity of at least one oriented thin magnetic layer, wherein the said detection is carried out by means of a differential measurement of the magnetoresistance of at least two adjacent and separate magnetic layers, whereof one is subject to the field of the circuit to be monitored and the other is subject to the field of a reference current, the circuits and layers being arranged also in such a way as to be independent of the variations in the magnetoresistance due to ambient variations of temperature and/or magnetic field.
The invention also relates to the application of the process to the monitoring of the possible breaking state of the supply circuits of electric lamps of a motor vehicle.
REFERENCES:
patent: 2946955 (1960-07-01), Kuhrt
patent: 3355601 (1967-11-01), Klein
patent: 3532928 (1970-10-01), West
patent: 3535626 (1970-10-01), Uemura et al.
patent: 3671809 (1972-06-01), Ryan et al.
patent: 3898513 (1975-08-01), Kopernik et al.
patent: 4075671 (1978-02-01), Cheatham et al.
patent: 4097802 (1978-06-01), Mahopac
Bajorek et al., Magnetoresistive Current Sensor, IBM Tech. Discl. Bull., vol. 18, No. 8, pp. 2745-2748, Jan. 1976.
Knickmeyer, K. H., Magnetoresistive Detection Apparatus, IBM Tech. Discl. Bull., vol. 18, No. 8, Jan. 1976, pp. 2565, 2566.
Commissariat a l''Energie Atomique
Handal Anthony H.
Meller Michael N.
Strecker Gerard R.
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