PID program is applied to the temperature control of hot air gun and soldering iron. The PID temperature correction cycle is divided into rapid 20ms, high-speed 100ms, and rapid 200ms. This program guarantees the accuracy and stability of temperature.
The PID temperature correction cycle of many YiHua high-end hot air guns is 20ms, while the soldering iron temperature correction cycle is high-speed 100ms or rapid 200ms. Because the temperature sensor is located inside the ceramic heater, a long time is required for the temperature passing to the iron mouth and then back. Therefore, high speed 100ms for each cycle is optimal control speed.