Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1988-09-29
1990-02-13
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324117R, 324251, 324252, 338 32H, G01R 3306, G01R 2108
Patent
active
049010085
ABSTRACT:
There is disclosed a circuit arrangement including a load (7) and a current source (1) for supplying current to the load via a current path with a winding (3). A core of magnetizable material (2) is coupled inductively with the winding and a Hall effect transducer (4) detects magnetic flux in the core for use in producing an output indication dependant on the magnitude of the load current. For testing the correct functioning of circuit(s), the circuit arrangement is further provided with an additional winding (6) on the magnetizable core, through which a further current source supply a further current, in which the core is also inductively coupled so that the transducer also detects flux in the core due to the further current.
REFERENCES:
patent: 3518459 (1970-06-01), Green
patent: 4692703 (1987-09-01), Extance et al.
patent: 4742296 (1988-05-01), Petr et al.
Kulesho; "Measuring Low Voltage in a D.C. Circuit"; Instruments and Experimental Techniques; vol. 19, No. 2, Pt. 2, pp. 562-563; Mar.-Apr. 1976.
Hill Nigel K.
Quastel David A.
Eisenzopf Reinhard J.
Nguyen Vinh P.
Westinghouse Brake & Signal Company Ltd.
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