| 摘要 |
A current sensor is disclosed which can detect even a very small current in a highly reliable fashion using a simple construction. The current sensor includes a magnetic impedance element for generating a voltage corresponding to the intensity of a magnetic field generated around an electric wire through which a current to be detected is flowing, a circuit unit including a driving circuit for driving the magnetic impedance element, and a calculation unit for determining the value of the current flowing through the electric wire from the voltage generated by the magnetic impedance element. The magnetic impedance element is firmly disposed in a case made of a non-magnetic material. A magnetic shield is disposed along the perimeter of the case so as to block an external magnetic field which would otherwise can cause a disturbance. The magnetic field is detected by the magnetic impedance element having a high sensitivity, and thus the current flowing through the electric wire is detected in a highly reliable fashion. <IMAGE> |
