I am developing a heating application where temperature need to be constant. I am planning to set the temperature @ 200 degree C. when my sensor find the temperature exceeding the set temperature how can i reduce the temperature of the heating element. I currently plan to cut the supply to heating element but is there any other method which i can reduce the temperature.
Practically you have two main choices involving i) on/off control; ii) average control.
i) Hysteretic control turns the heater on at a lower limit and turns it off at an upper limit. (i.e. on/off).
ii) Drive the heater with a fast switching PWM signal (via Switches and a switch-driver) so that the average value of the temperature is your desired setpoint value. This usually involves feedback and a controller such as a PID.