| 摘要 |
<p>PURPOSE:To make detection possible with high accuracy, low losses and ease by detecting the megnetic flux generated by the current to be measured, feeding the DC current corresponding to the quantity of said magnetic flux to a control winding, and detecting this current as the current corresponding to the current to be measured. CONSTITUTION:A control winding 3 wound by as much as prescribed number of windings is disposed to an iron core 3 in such a manner as to become the phase reverse from that of the load current of a conductor 1. One end of the winding 3 is connected to the output side of a current amplifier 4 and the other end is grounded via a resistance 5. The voltage divided by resistances 6, 7 is supplied as reference voltage to the one input terminal of the amplifier 4 and the voltage corresponding to the quantity of magnetic flux by the load current detected with a magnetoresistance element 8 such as ''Sony Magnet Diode '' is supplied to the other. In the element 8, two elements 8a, 8b of uniform temp. characteristics are connected in series by reversing their polarities with respect to the magnetic field. Thereby, desired current is detected easily at low losses in spite of the large current to be measured.</p> |
