| 摘要 |
<p>PURPOSE:To accurately measure the current of a specific electric wire without receiving the effect of the magnetic field generated in the other electric wire, by arranging a measuring electric wire at a right angle to the other electric wire and further arranging a magnetic core at a right angle with respect to the direction of the measuring electric wire. CONSTITUTION:An electric wire A is constituted of the connecting wire 5 reaching a power-board 14' from a dynamo for a vehicle and the connecting wire 18 to a battery 18 through a terminal 16 while an electric wire B is constituted of the connecting wire 19 extending from the terminal 16 at a right angle and the connecting wire 21 parallel to the electric wire A and reaching electric load. A magnetic core 1a is arranged at a right angle to the wire 19 and a magnetoelectric converting Hall element 1b inserted in the gap part of the core 1a. When the magnetic fields generated by the currents I2, I1 of the electric wires A, B and the magnetic fields gathered to the core 1a are set to H2, H3, H1 and H, since the magnetic field H3 is present in a direction negating the magnetic field H1, H=H1+H2-H3 is formed and, because of H2=H3, H=H1 is formed. As a result, the Hall element 1b receives no effect of the magnetic field generated by the current I2 of the electric wire A and detects the magnetic field generated in the electric wire B to accurately measure the current I1.</p> |
