| 摘要 |
PURPOSE:To attain the man-hour having of control/management and automation by using a D/A converter, a comparator and an adder so as to form a circuit limiting an output voltage of a transfer function circuit thereby setting the limit voltage digitally. CONSTITUTION:An upper limit voltage is outputted from a D/A converter 1 in response to a digital setting value VHd and compared with an output voltage by a comparator circuit 2. The output of the circuit 2 is fed back to an adder 5 when the output voltage is larger and the output is lowered to the upper limit voltage. Then a lower limit voltage is outputted from a D/A converter 3 in response to a digital setting value VLd and compared with an output voltage by a comparator circuit 4. When the output voltage is smaller, the output of the circuit 4 is fed back to the adder 5 and the output is boosted up to the lower limit voltage. The upper/lower limit voltage is set digitally in this way, then the man-hour saving of control/management and automation are attained. |
