| 摘要 |
PURPOSE:To obtain a proper control response despite the current variation due to inductance by using a function circuit which calculates the inductance value changing in response to the current and a gain control circuit which controls the transmission characteristics in accordance with the output of the function circuit. CONSTITUTION:The current feedback signal is supplied to a terminal A and then impressed to an operational amplifier 18D via a resistance 17H. The DC bias is impressed to the amplifier 18D via a resistance 17J together with the feedback input voltage impressed via a resistance 17K. Furthermore the voltage is impressed to the amplifier 18D to secure the broken line characteristics corresponding to the saturation characteristics of inductance via potentiometers 27A and 27B, diodes 26A and 26B and resistances 17L and 17M. The output of the amplifier 18D is impressed to an operational amplifier 18 via a diode 26C and a resistance 17N. Thus an inductance signal containing the saturation characteristics corresponding to a current feedback signal is obtained from a signal L. |
