Patent ID: 8994365
Filing Date: 2015-03-31
Classification: G01R

Abstract:
1. A current detection apparatus, comprising: two magnetic detectors that are arranged oppositely on a front surface and a back surface of a board which is located above a current path in order to detect a strength of a magnetic field which is generated by a current which flows in the current path, wherein the two magnetic detectors are located in different distances from the current path; an electromagnetic shielding frame member that is mounted on the current path so that the two magnetic detectors and a part of the current path where the two magnetic detectors are arranged are accommodated inside the electromagnetic shielding frame member; and a control circuit that determines whether a failure occurs in either of the two magnetic detectors from a difference between magnetic fields detected by the two magnetic detectors, respectively, wherein sensitivities of the two magnetic detectors are adjusted so that current values outputted from the two magnetic detectors depending on detected magnetic fields are identical to each other in a normal state.