| 摘要 |
PURPOSE:To optionally set a time constant and a limit value of an integral network, by comparing an output of an integral network with setting voltage, and controlling the magnitude of input voltage of an integral network by said output so that an integral direction is reversed. CONSTITUTION:On the output side of an integral circuit are provided comparators 9, 10 for comparing the output voltage V0 with upper limit and lower limit voltage VR1, VR2, respectively, and generating prescribed output voltage. For instance, when input voltage V1 has exceeded comparison voltage E, the voltage V0 is decreased and dropped from the initial voltage value by the integral control action. When this decreasing direction has become the lower limit VR2 or below, the comparator operates, generates a voltage output, subtracts the voltage V1 by a subtraction synthesizing circuit 14, drops input voltge of an operational amplifier 2 to the voltage E or below, and whe this voltage becomes the voltage E or below, the voltage V0 starts to rise, and when it becomes larger than the voltage VR2, the comparator stops its operation, and controls the voltage V0. When the voltage V1 becomes the voltage E or below and the voltage V0 becomes larger than the voltage VR1, the comparator 9 operates so that input voltage of the amplifier 2 is raised by an addition synthesizing circuit 13. |
