| 摘要 |
<p>PURPOSE:To make it possible to reduce the number of parts to a large extent, by negating influence by parallel magnetic fields, of which the outer peripheries are uniform, by differential connection and constituting a magnetic semiconductor connection type self-exciting circuit by a current responsive part itself comprising an operation amplifier. CONSTITUTION:Magnetic cores 4a, 4b are inserted into the center space part of a glass tube around which primary winding 2 and secondary winding 3 are respectively wound in reversed polarity. Now, when the output of an operation amplifier 6 is saturation voltage Vs, an exciting current flows to the primary winding 2 through a resistor 9. During excitation before the magnetic cores reach max. magnetic flux density levels, because the coil impedance of the secondary winding 3 is lowered and the charge of a capacitor 5 is discharged, a negative voltage signal is inputted to the non-reversal terminal 8 of the operation amplifier 6 and output is changed over to negative DC saturation voltage -Vs. By this mechanism, square wave voltage with a duty ratio corresponding to the input current between terminals 50a, 50b is outputted to the output of the operation amplifier 6 and inputted to an indicator 23 through integrator circuits 13, 14 and an operation amplifier 16.</p> |
