Patent ID: 8754642

Claim:
A magnetic balance type current sensor comprising: a magnetic field detection bridge circuit, including: a magnetoresistance effect element having a resistance value which changes depending on an induction magnetic field applied thereto from a current to be measured; and an output configured to generate a voltage difference in accordance with the induction magnetic field; a feedback coil disposed in a vicinity of the magnetoresistance effect 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; a magnetic shield configured to attenuate the induction magnetic field and to enhance the cancelling magnetic field; a current detection unit configured to measure the current to be measured on the basis of the feedback current flowing through the feedback coil in an equilibrium state in which the induction magnetic field and the cancelling magnetic field are cancelled out each other, wherein the feedback coil, the magnetic shield, and the magnetic field detection bridge circuit are formed on a same substrate, and wherein the feedback coil is disposed between the magnetic shield and the magnetic field detection bridge circuit, and the magnetic shield is disposed between the current to be measured and the feedback coil.