MAGNETIC COUPLER ELEMENT AND MAGNETIC COUPLING TYPE ISOLATOR

摘要

A magnetic coupler element (2) includes: a magnetic field generation circuit having excitation coils (7a, 7b) for generating a magnetic field in accordance with an input current; and a detection bridge circuit having a pair of magnetoresistive elements (9a, 9b) whose resistance value is changed when a magnetic field generated in the magnetic field generation circuit is applied. The detection bridge circuit further has two outputs (12a, 12b) which generate a voltage difference in accordance with the intensity of the magnetic field generated in the magnetic field generation circuit. Each of the magnetic field generation circuit and the detection bridge circuit is formed to have an axis-symmetric or a point-symmetric geometrical shape, so as to obtain a high S/N ratio even in the high frequency.