| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a current detector which restrains heat from being generated from a current booster circuit, whose reliability is improved, which is low-cost, and which can be miniaturized. SOLUTION: In a current detector, a magnetic-body core 2, which is constituted in such a way that a magnetic flux is generated by a current, to be measured, flowing in current bus 1 is provided, a secondary coil 5 which is wound on the core 2 is provided, a magnetic sensor 4 which is inserted into the gap 3 of the magnetic-body core 2 is provided, a balanced circuit 6 in which a balanced current used to offset the magnetic flux generated in the magnetic-body core 2 is given to the secondary coil 5 for the output of the magnetic sensor 4 becomes always zero is provided, and the balanced current is output from an output terminal. A dummy resistance 9 is connected across the secondary coil 5 and the output terminal.</p> |
