US 11,656,251 B2
Radiation hardened magnetic current sensor
John Vorndran, Roscoe, IL (US)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on May 4, 2021, as Appl. No. 17/307,137.
Claims priority of provisional application 63/021,897, filed on May 8, 2020.
Prior Publication US 2021/0349131 A1, Nov. 11, 2021
Int. Cl. G01R 19/00 (2006.01); G01R 15/20 (2006.01)
CPC G01R 19/0092 (2013.01) [G01R 15/207 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An integrated magnetic current sensor comprising:
a first transformer comprising a first magnetic core, a first primary winding and a first secondary winding;
a voltage source configured to supply a first alternating current (AC) voltage to the first secondary winding;
a second transformer comprising, a second magnetic core, a second primary winding, a second secondary winding, and a third secondary winding, wherein the first primary winding and the second primary winding are connected in series;
a bi-directional current source configured to bias a magnetic field in the second magnetic core by supplying a current to the second secondary winding responsive to a sense current flowing through the first primary winding and the second primary winding; and
a first operational amplifier configured to operate the bi-directional current source;
wherein biasing the magnetic field in the second magnetic core comprises operating, by the first operational amplifier, the bi-directional current source to supply the current to the second secondary winding in a direction that is opposite a direction of the sense current flowing through the first primary winding.