| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of removing an influence of hysteresis by a simple constitution without complicated operation.SOLUTION: A current detector 100 includes: a magnetic body core 102 which is arranged annularly in a revolving direction of a magnetic field generated upon conduction of a current (If) to be detected, and on a part of which a gap 102d where a Hall element 106 is disposed is formed; and a demagnetization circuit 150 which erases a magnetic flux remaining on the magnetic body core 102 by applying an AC current having a prescribed attenuation characteristic at a frequency within a prescribed range, to a coil 156 for demagnetization provided on the magnetic body core 102.SELECTED DRAWING: Figure 1 |
