Temperature controller for electric heating mats
The present invention relates to a temperature controller for electric heating mats, which employs a conductive resistor, having a resistance value varying according to variation in temperature, as the heating cable of the temperature controller, so that a resistance value proportional to temperature is adjusted, thus the temperature of an electric heating mat is precisely controlled. The temperature controller of the present invention further includes a temperature compensation unit, a positive feedback circuit unit, a safety circuit unit and an error correction unit, so that the temperature detected by the temperature detection unit is compensated for, thus enabling the detection of the heating temperature of a thermosensitive wire without causing an error. Further, an output control signal, output from the temperature comparison unit, is stably provided. Further, when the heater and the sensor are shorted, and full commercial power is induced at the sensor, a high level detection voltage is provided to the temperature comparison unit, so that the output device is switched to an off state, thus preventing heating power from being supplied to the heater. Further, errors occurring due to the components connected to the sensor or the temperature setting unit can be manually eliminated.