| 摘要 |
<p>An electric-current sensor in which a calculation process is performed on detection values of two magnetic sensing elements, whereby the effect of an external magnetic field is eliminated, wherein it is possible to make the sensor more compact without compromising the precision with which an electric-current value is measured. This electric-current sensor (1) is provided with an electric-current path (2) including a region (R) formed by a main electric-current path (21) and a pair of secondary electric-current paths (22, 23) arranged in parallel across a gap on either side of the main electric-current path (21), a pair of magnetic sensing elements (3a, 3b) provided between the main electric-current path (21) and each of the secondary electric-current paths (22, 23) in region (R), and a calculation circuit for calculating an electric-current value of the main electric-current path (21) on the basis of detection values from the pair of magnetic sensing elements (3a, 3b). The resistance values of the pair of secondary electric-current paths (22, 23) are equal, and the resistance value of the main electric-current path (21) is different from the resistance values of the pair of secondary electric-current paths (22, 23).</p> |
