The electric heat mat controller

Abstract

The invention relates to an electric heat mat controller, which adopts the conductive resistor whose resistance value changes followed by the temperature as a heating wire for a temperature controller. Therefore, the invention can regulate the resistance value in direct proportion with the temperature so as to accurately control the temperature of the electric heat mat. The temperature controller further comprises a temperature compensating unit, a positive feedback circuit unit, a safety protective circuit unit and an error correction unit. The temperature measured by the temperature measuring unit is compensated so as to measure the heating temperature of the Thermal sensitive wire errorlessly. In addition, a temperature comparing unit can stably output control signal. When the heater and sensor are short-circuiting and the sensor senses the adequate industrial electricity, a high level measuring voltage is supplied to a temperature comparing unit so as to switch the output device to the closing status and cut off the heating electrical source to the heater. Further, the error generated by the member connecting with the sensor or temperature setting unit is eliminated manually.

Description

technical field [0001] The present invention generally relates to a thermostat for electric heating carpets, in particular to a thermostat for electric heating carpets using conductive resistors. The conductive resistor is used as the heating wire of the temperature controller, and its resistance value can change with the change of temperature, so it can be adjusted to make the resistance value proportional to the temperature, so that the temperature of the electric heating carpet can be precisely controlled. Background technique [0002] Typically, a heated carpet with a thermostat provides heat easily if it is placed on the floor and power is supplied to it. Because the electric heating carpet is not only convenient to use, but also easy to move, it is widely used for heating. [0003] The phase control method used in the traditional electric carpet thermostat has the following problems: first, the accuracy of temperature control is very low, and there is switching noise ...

AI Technical Summary

Problems solved by technology

[0003] The phase control method used in the traditional electric carpet thermostat has the following problems: first, the accuracy of temperature control is very low, and there is switching noise in a wide frequency band, which causes circuit failure; second, it is necessary to use such as line filter Such a shielding device is used to remove noise, thus increasing the cost; third, with the heating of the heating device, an electric field will inevitably be generated, which will emit unwanted electromagnetic interference EMI. Objects and living beings are harmful

[0006] In addition, the problem with the thermostat used in conventional heated carpets is that in order to cut off the overvoltage in the event of an overvoltage, the heating wire must be connected to a separate fuse

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