| 摘要 |
<p>PURPOSE:To realize high accuracy, small-sized and energy economization of a titled device, by electromagnetically coupling a search coil to a secondary coil, and reducing a current error of the secondary coil. CONSTITUTION:When a current is made to flow to a primary coil 1, an induced current of a secondary coil 2 is supplied to a load 6. Voltage induced in a search coil 8 wound round an iron core 3, due to a difference of magnetomotive force of a current of said each primary and secondary coil is applied to an operational amplifier 4. To an inverted input terminal of the amplifier 4, an input side impedance element 5a and a negative feedback impedance element 5b, having the same value are coupled. As a result, the output potential of the amplifier 4 becomes 2 times as high as non-inverted input potential. Also, an impedance element 9 being equal to energizing impedance of the coil 8 is coupled with the amplifier 4, a current of the element 9 flows into the coil 8 as it is, and an error of a secondary current of the coil 2 is reduced.</p> |
