| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a DC current sensor and a DC current measuring method capable of suppressing a measurement error generated by residual magnetization with time. <P>SOLUTION: In this DC current sensor 34 having a core member 40 comprising a magnetic body on which a winding 41 into which a DC current I<SB>1</SB>to be measured is input is wound into a coil shape, for measuring the current I<SB>1</SB>to be measured based on an output I<SB>2</SB>of a winding 42 for detecting a change of a magnetic flux generated from the current I<SB>1</SB>to be measured and collected by the core member 40, the residual magnetization generated in the core member 40 can be removed by including a circuit 43 and a switch SW for applying an AC magnetic field to the core member 40. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
