| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To realize miniaturization, weight reduction, and cost reduction, by acquiring a constitution having a core and windings of a half of a conventional case, comprising one measuring closed magnetic circuit core and two windings of one excitation winding and one detection winding. <P>SOLUTION: This sensor includes the closed magnetic circuit core 1 wherein a magnetic flux by a current to be measured is generated, the excitation winding 2 and a feedback winding 3 applied to the closed magnetic circuit core 1, a series circuit by an oscillator 4 and a resistance 5 connected between both ends of the excitation winding 2, a positive side peak detection circuit 6 for detecting a positive side peak value of an AC voltage generated in the excitation winding 2 and a negative side peak detection circuit 7 for detecting a negative side peak value of the AC voltage, and an amplifier 8 for magnetic equilibrium for sending a feedback current into the feedback winding 3 so that a difference between the positive side peak value detected by the positive side peak detection circuit 6 and the negative side peak value detected by the negative side peak detection circuit 7 becomes zero. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
