| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a compact current detecting device that is capable of detecting a micro current at low cost with small current consumption and is minimally affected by ambient environmental conditions. <P>SOLUTION: A current detecting device comprises: an exciting coil 4 wound around a magnetic core 3 surrounding a lead wire where a measurement current flows; oscillation means 5 for generating, in accordance with a set threshold value, a rectangular wave voltage for inverting a direction of a magnetization current supplied to the exciting coil with the magnetic core placed in or in the vicinity of a saturated state; current detection means 6 for detecting the measurement current on the basis of change in a duty of the rectangular wave voltage output from the oscillation means 5; frequency detection means 7 for detecting a frequency of the rectangular wave voltage output from the oscillation means; and threshold setting means for setting the threshold value for the oscillation means on the basis of the frequency detected by the frequency detection means. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
