Sensing system for measuring a parameter

Details Sensing system for measuring a parameter Sensing system for measuring a parameter

G - Physics

01

R

324/60

G01R 17/08 (2006.01) G01R 15/20 (2006.01) G01R 17/06 (2006.01)

Patent

CA 1235747

SENSING SYSTEM FOR MEASURING A PARAMETER ABSTRACT: A parameter, such as the current flowing through a conductor, is measured by initially passing an energiz- ing magnetic flux through a hall element (12) 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 (15) and employed to control the operation of an integrator (19) to develop a cancelling current (21-23,32,33) to establish an equal, but oppo- site 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 (23) a control voltage to represent the measured parameter.

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