| 摘要 |
PURPOSE:To decrease the overshoot of an output by providing a comparison circuit indicating PID operation depending on an output temperature. CONSTITUTION:When an output of a temperature detector 2 is smaller than an output of a threshold value generating circuit 7, the comparison circuit 6 stops a PID circuit 3, drives a heater energyzing circuit 4 so as to continue to energize a heater 5. When an output of a temperature detector 2 exceeds an output of the threshold value circuit 7, the energyzing of the heater 5 is stopped through the heater energyzing circuit 4 so as to drive the PID circuit 3. The PID circuit 3 performs PID operation from the point of time and drives the heater energyzing circuit 4 so that the temperature of the heater 5 is coincident with an object value. |
