| 摘要 |
PURPOSE:To make it possible to obtain stable detection output even to a minute input magnetic field while enlarging the tolerant range of the input magnetic field, by adding a magnetomotive force negative feedback system for using detection output signal of a magnetic flux responsive type detector as an error input signal. CONSTITUTION:When input magnetomotive force Fs is applied to a saturable coil 1 around which the exciting coil Ni of a magnetic flux responsive type detector 3 is wound, magnetic flux detector output E is outputted from a magnetic flux detecting coil Np. This magnetic flux detector output E is applied to a V-I converter circuit 5 to be converted to a current I and a negative feedback magnetic force generating coil Nc6 generates negative feedback magnetomotive force FC upon response to I. In this case, because error magnetomotive force Fe corresponding to the difference of Fc and input magnetomotive force Fs is inputted to a saturable core 1 and a magnetomotive force negative feedback system 4 is operated so as to make negative feedback magnetomotive force Fc equal to input magnetomotive force Fs, the input magnetomotive force Fs can be detected from the output voltage of a magnetic flux detector. |
