Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1983-08-22
1987-01-27
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324 99R, 324207, 324251, G01R 3300, G01R 1900
Patent
active
046396659
ABSTRACT:
A parameter, such as the current flowing through a conductor, is measured by initially passing an energizing magnetic flux through a hall element to produce a hall voltage proportional to the sensed parameter. To eliminate temperature, aging and non-linear effects normally associated with a hall element, the amplitude of the hall voltage is effectively ignored and only its polarity is detected and employed to control the operation of an integrator to develop a cancelling current to establish an equal, but opposite direction, cancelling flux in the hall element. With a zero net flux, the integrator will hold the cancelling current at the level required to balance out and cancel the initial energizing flux. Since the cancelling current needed to null the energizing flux will be proportional to that flux, the current may be used to produce a control voltage to represent the measured parameter.
REFERENCES:
patent: 2996670 (1961-08-01), Simonton
patent: 3573616 (1971-04-01), Kahen
Data Sheet for Non-Contact DC and AC Current Sensors (ID-5000 M Series) made by F. W. Bell, Inc., Oct., 1978.
Data Sheet for LA 200-S TransfoSHUNT made by LEM, Geneva, Switzerland, Oct., 1977.
Borg-Warner Corporation
Karlsen Ernest F.
Tracy James E.
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