Patent ID: 8519704
Filing Date: 2013-08-27
Classification: B82Y,G01R

Abstract:
1. A magnetic-balance-system current sensor comprising: a magnetic field detection bridge circuit, including: a magnetic core disposed in a vicinity of the magnetoresistive element; a feedback coil disposed in a vicinity of the magnetoresistive element, configured to receive a feedback current corresponding to the voltage difference, and generate, in accordance with the feedback current, a cancelling magnetic field for cancelling out the induction magnetic field; and a current detector configured to measure the measurement target current on the basis of the feedback current flowing through the feedback coil when the induction magnetic field and the cancelling magnetic field are in a state of equilibrium in which the induction magnetic field and the cancelling magnetic field cancel out each other, wherein the feedback coil, the magnetic core, and the magnetic-field detecting bridge circuit are formed on a same substrate, and wherein the feedback coil is of a spiral type, and the magnetic core is provided above and below the feedback coil.