Abstract
Temperature is an important physical parameter, on many occasions to temperature measurement and control facility. Temperature controller in industries in a wide range of applications, temperature controller is increasingly types.
The design of the low cost, LM324 temperature controller chip design as the core temperature controller. This is by platinic resistance temperature sensor of a series of temperature sensor, and the measured data in LM324 through amplification, and then pass with setting the voltage, through comparing the PNP transistors to control the ac contactor, control of heater working condition.
The temperature controller for the temperature control circuit, 200-280 degrees are mainly applied in welding machine, the temperature control. Mainly by the power circuit, temperature detection circuit voltage circuit, temperature, the benchmark instructions circuit, voltage amplifier circuit and control circuit.
Keywords: temperature control temperature sensor relays LM324
