US 7,321,226 B2
Temperature compensated and self-calibrated current sensor using reference current
Christopher Paul Yakymyshyn, Seminole, Fla. (US); Michael Allen Brubaker, Loveland, Colo. (US); and Pamela Jane Yakymyshyn, Seminole, Fla. (US)
Assigned to FieldMetrics, Inc, Seminole, Fla. (US)
Filed on Nov. 06, 2006, as Appl. No. 11/556,954.
Application 11/556954 is a division of application No. 10/905509, filed on Jan. 07, 2005, granted, now 7,164,263.
Claims priority of provisional application 60/481906, filed on Jan. 16, 2004.
Prior Publication US 2007/0205749 A1, Sep. 06, 2007
Int. Cl. G01F 23/00 (2006.01)
U.S. Cl. 324—117R  [324/117 H; 324/126; 324/127] 6 Claims
OG exemplary drawing
 
1. A method to compensate for the temperature dependence of a current sensor comprised of a plurality of magnetic field sensors positioned around a first current carrying conductor, the outputs of which are electronically combined to produce a signal representing the current flowing in said first current carrying conductor, where a power source provides electrical power to each said magnetic field sensor, where the sensitivity to magnetic fields of each said magnetic field sensor is proportional to the voltage of the said power source that is applied to each said magnetic field sensor, comprising the steps of positioning a second current carrying conductor substantially parallel to said first current carrying conductor so that the plurality of said magnetic field sensors are positioned around said first and second current carrying conductors, passing a known alternating current in the said second current carrying conductor, electronically processing the said signal representing the current flowing in said first and second current carrying conductors to generate an error signal that depends only on the current in the said second current carrying conductor, and using the error signal to control the voltage of the said power source that provides electrical power to each of the said magnetic field sensors.