What is the digital temperature controller?
temperature control is a prerequisite for virtually every chemical reaction that people are interested in. The temperature affects the reaction rate and often the completeness of the reaction. The human body includes a system of biological temperature to maintain a narrow range of body temperature. Processes for the production of different materials also require temperature control. The engineer has a choice between an analog and digital temperature regulator.
Some analog home thermostats consist of a copper strip spiral. When the strip expands with heat, the spiral extends and moves with a mechanical lever. The furnace or air conditioning responds corresponding to the way. Analog regulators respond only to the current environment. If the system heats up rapidly, the analog system will only respond if the driver reaches its desired temperature, called the desired value (SP). The heat source can be switched off, but the system exceeds SP because it absorbs energy from the warm radiant surfaces surrounding the system. Digital temperature controller inIt calculates the speed at which the temperature rises and triggers the device to react before reaching sp. The controller used previous data to predict and change future results.
There are many algorithms or schemes of a calculation that could use a digital temperature regulator. One of the most common is proportional-integral derivative or PID controller. It uses three separate calculations to maintain a constant temperature.
Error (E) is the difference between the actual temperature (T) and the temperature desired (SP). Proportional calculation changes the input current into a process based on size E. E 2 Would require energy input twice input E 1.
Proportional control prevents the system from exceeding SP, but the reaction may be slow. The integral method assumes that future data trends will last. In the above example, if t increases by E 2 and then E 4, the system may expect another E, so insteadThis could have tripled the answer and not wait for further measurements.
Proportional and integral (PI) driver can oscillate around SP, jump between too warm and too cold. The derivative control method dampens oscillations. The rate of change E is used in the calculation.
PID controller uses a weighted diameter of three calculations to determine what action should be performed at any time. This digital temperature regulator is the most common and effective because it uses current, historical and expected data. Other control schemes require ton information. Such knowledge increases the ability of the controller to predict the future response of the system.