KR101833542B1 - Temperature Controller for Heating Mat with Self diagnosis and overheating prevention - Google Patents

Abstract

According to a temperature adjusting device for a thermal mat having self diagnosing and overheating preventing functions, a functional defect of an SCR is found in advance wherein the SCR is an element configuring an output unit to supply power to a heating unit so as to block supply of inputted AC power, thereby fundamentally blocking heating through a heating line to prevent accidents such as fire and the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature controller for a heating mat having self-diagnosis and overheating prevention function,

The present invention relates to a temperature controller for a heating mat having a self-diagnosis function and an overheating prevention function, and more particularly to a temperature controller for a self- The present invention relates to a thermostat for a heating mat having a self-diagnosis function and an overheat prevention function for preventing a safety accident such as a fire by blocking the supply of power by cutting off the heat generated from the heating line.

Gradually, our lifestyle is shifting from the existing ondol heating system to the western style, and we prefer to use the bed type heating system in this situation.

As a result, there is a disadvantage that the bed shifts to hot in summer and cold in winter. In the case of people who are accustomed to the existing ondol, there is a serious health effect, and due to the increase in the elderly population, This is true.

Therefore, a heating mat is used to keep the cold bottom of the room warm at a predetermined temperature. In such a heating mat, a heating member that generates heat by the input voltage is used. A temperature regulator is used to prevent the temperature from exceeding the set predetermined temperature.

In the heating member used in the conventional heating mat, heat is generated by applying a current to an electric heating wire having a constant resistance. When the heating mat is continuously used, the control function is lost when a component inside the temperature adjusting unit is short- There is a problem that a serious safety accident such as a fire and an accident may occur.

Korean Utility Model Registration No. 20-0405789

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a power supply control apparatus and a power generation control method thereof, The object of the present invention is to provide a thermostat for a heating mat that has a self-diagnosis function and an overheat prevention function to prevent a safety accident such as a fire by blocking the heat from the source.

In order to achieve the above object, the present invention provides a temperature controller for a heating mat having a self-diagnosis function and an overheating prevention function, the apparatus comprising: an AC power supply unit for supplying a sine wave of a (+) half- A power indicator that is turned on by a voltage applied from the AC power supply unit and indicates whether power is supplied; A reference voltage generating unit for dividing an AC power supplied from the AC power supply unit and providing a reference voltage; A heating unit which receives an AC power from the AC power supply unit to generate heat and senses a temperature and varies a resistance value according to temperature; A sensor voltage charging / discharging unit for charging / discharging a voltage applied through the heating unit; A comparing / tree rejecting unit for comparing the charging voltage of the sensor voltage charging / discharging unit with the reference voltage of the reference voltage generating unit to supply and shut off the trigger voltage when the charging voltage is higher than the reference voltage; A sensor voltage setting unit that has a variable resistor and changes the AC resistance value according to a user setting to vary a charging voltage level of the sensor voltage charging unit to switch the comparison / tree rejection; And an output unit that is switched by a trigger voltage provided from the comparison / tree rejection and supplies power to the heating unit, the temperature controller including: A heating resistor having an exothermic temperature value proportional to the exothermic temperature of the heat generating part and a thermal fuse installed to be in proximity to or in contact with the exothermic resistance and disconnected when the exothermic temperature is reached to interrupt the AC power supply; And a sensor function sensing unit connected between the overheat interruption unit and the output unit, and configured to cause the exothermic resistance to generate heat at an exothermic temperature value when it is determined that the SCR provided in the output unit is malfunctioning.

The sensor function sensing unit includes a resistor connected to the anode of the SCR constituting the output unit, a transistor having a base connected to the cathode of the SCR constituting the output unit, a collector connected to the cathode of the Zener diode and an emitter connected to the thermal fuse, And another SCR connected between the anode and the exothermic resistor; If it is determined that the SCR provided in the output portion is malfunctioning, the Zener diode and the SCR connected thereto may conduct, so that the exothermic resistance may instantaneously generate heat at the maximum value of the exothermic temperature.

The temperature controller for a heating mat having a self-diagnosis function and an overheat prevention function is formed by connecting a diode and a resistor in parallel and connected to a reference voltage generating unit constituted by a resistor connected in parallel. The resistor can be prevented from generating heat.

An NPN-type switching transistor whose base is connected to the output terminal of the sensor voltage setting unit so that the comparison / tree rejection is switched by the voltage output from the sensor voltage setting unit, and an emitter is connected to the output terminal of the reference voltage generating unit; A base connected to a collector of the switching transistor for amplifying an output current of the switching transistor, a collector connected to the emitter of the switching transistor in common, and a PNP type transistor having an emitter connected to an output terminal of the AC power supply unit An amplifying transistor of the transistor; And a noise removing capacitor connected between the base and the emitter of the switching transistor so as to remove pulse-shaped noise inputted to the base of the switching transistor.

A temperature controller for a heating mat having a self diagnosis function and an overheat prevention function includes an antenna for sensing an electric potential generated from the outside, a transistor for receiving and amplifying the sensed signal through a resistor and a base, A diode for preventing the protection and malfunction of the circuit when an overvoltage or an overcurrent that instantaneously flows through the antenna due to an external factor such as static electricity is generated and a capacitor for removing noise from the signal detected by the antenna And an electric field detecting unit configured to detect the electric field.

The sensor voltage setting unit may further include a damping resistor connected in parallel to reduce a variation in the resistance value of the variable resistor.

According to the above-described self-diagnosis and temperature controller for a thermal mat having the overheat prevention function of the present invention, it is possible to grasp the functional defects of the SCR, which is an element constituting the output unit for supplying power to the heat generating unit, By interrupting the supply of power, it is possible to prevent a safety accident such as a fire from occurring by originally shutting off heat generation through the heating wire.

1 is a circuit diagram showing a configuration of a temperature controller for a heating mat having a self-diagnosis function and an overheating prevention function according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the present invention.

1, the temperature controller for a heating mat having a self-diagnosis function and an overheating prevention function according to an embodiment of the present invention includes an AC power supply unit (not shown) for supplying a sine wave of a (+) half- 10), a power display unit 20 that is turned on by a voltage applied from an AC power supply unit 10 and indicates whether power is supplied, a reference voltage supply unit 20 that divides the AC power supplied from the AC power supply unit 10 to provide a reference voltage A voltage generating unit 30, a heating unit 40 receiving an AC power from the AC power supply unit 10 to generate heat, sensing a temperature and varying a resistance value according to temperature, A charging voltage of the sensor voltage charging part 50 is compared with a reference voltage of the reference voltage generating part 30. When the charging voltage is higher than the reference voltage, Voltage And a comparator / tree rejecting unit 110 for supplying and cutting off the output voltage of the comparator / tree rejection unit 110 and a variable resistor. The alternating current resistance value is varied according to the user's setting to vary the charging voltage level of the sensor voltage charging / An output unit 80 provided with a sensor voltage setting unit 130 for switching a trigger voltage supplied from the comparison / tree rejection unit 110 and switching the trigger voltage supplied from the comparison / tree rejection unit 110 to supply power to the heating unit 40, .

The comparison / tree rejection unit 110 includes a switching transistor Q1, an amplifying transistor Q2, a trigger voltage capacitor C2, and a noise removing capacitor C5.

The switching transistor Q1 is of NPN type and its base is connected to the output terminal of the sensor voltage setting unit 130 so as to be switched by the voltage outputted from the sensor voltage setting unit 130. The output terminal of the reference voltage generating unit 30 An emitter is connected.

The amplifying transistor Q2 is of the PNP type and its base is connected to the collector of the switching transistor Q1 so as to amplify the output current of the switching transistor Q1 and the collector of the switching transistor Q1 is common to the emitter of the switching transistor Q1 And an emitter is connected to an output terminal of the AC power supply unit 10.

The capacitor C6 for the trigger voltage is charged to the capacitor C6 during the positive half-wave of the AC power applied from the AC1 terminal of the AC power supply unit 10 and the AC2 of the AC power supply unit 10 The sensing voltage Vs is discharged from the capacitor C6 during a (-) half wave of the AC power source applied at the terminal.

The noise removing capacitor C5 is connected between the base and the emitter of the switching transistor Q1 so as to remove the pulse-shaped noise input to the base of the switching transistor Q1.

The sensor voltage setting unit 130 includes a variable resistor VR1 and a plurality of resistors R5, R10, R16 and R18 and a plurality of diodes D5, D9 and D16. The resistance of the variable resistor VR1 And a damping resistor R17 connected in parallel to reduce the deviation of the value.

Hereinafter, the operation of the temperature controller for the self-diagnosis and the heating mat with the overheat prevention function according to the present invention will be described.

First, when the power switch SW1 is turned on by the user, AC voltage of a sinusoidal wave is supplied from the AC power supply unit 10. The AC1 stage of the AC power supply unit 10 is negative and the AC2 stage is positive Sensor charging period, AC1 terminal of AC power supply 10 is positive and AC2 terminal is a conduction period of SCR (TH1) of output unit 80 during (-).

When the power is supplied from the AC power supply unit 10, the plurality of LEDs D7 and D3 of the power source display unit 20 are turned on to notify the power supply to the outside, and during the sensor charging period, The upper end of the resistor R14 is (-) and the lower end thereof is (+) by the resistors R14 and R6, and the reference voltage is provided.

Since the (-) voltage is applied to the AC1 terminal of the AC power supply unit 10 and the (+) voltage is applied to the AC2 terminal, the sensing voltage Vs is charged in the capacitor C6 and the trigger voltage is supplied to the trigger voltage capacitor C2 The sensing current flows through the path of the AC2 stage → the heating line H2 and H1 → the sensing line (or magnetic field canceling line) S2, S1 → R10 → C6 → AC1, And the lower end of the capacitor C6 is charged with the positive voltage Vs.

At this time, the electric resistance decreases as the temperature rises, and the sensing current rises, and the capacitor C6 is charged with a voltage proportional to the temperature.

The trigger voltage is divided by the partial pressure of the partial pressure resistors R6 and R14 while flowing through the path of the AC2 stage → H2 → H1 → R6 → R14 → AC1 stage and the AC2 stage → H2 → H1 → R7 → C2 → D6 → R14 → AC1 stage The trigger voltage is charged and the reference voltage VR is generated in the polarity of the lower end of the R14 and the upper end of the capacitor C2.

The sensing voltage Vs charged in the capacitor C6 is applied to the gate of the switching transistor Q1 through R10? S2? S1? R16? VR1? R5? D5 and R10? S2? S1? R16? R17? R5? (+) Voltage of the reference voltage VR is applied to the emitter of the switching transistor Q1 via D16 and is compared in the switching transistor Q1 during the sensor charging period to generate the sensing voltage Vs The switching transistor Q1 is turned on and the trigger voltage capacitor C2 is discharged and the SCR TH1 is not triggered in the conduction period so that the heating of the heating lines H1 and H2 is stopped.

Here, by connecting the damping resistor R17 in parallel to the variable resistor VR1 of the sensor voltage setting unit 130, the resistance error can be reduced.

That is, the error range of the variable resistor VR1 is reduced by the sum of the resistance values of the variable resistor VR1 and the damping resistor R17.

Conversely, if the sensing voltage Vs is less than or equal to the reference voltage VR, the switching transistor Q1 is not turned on and the trigger voltage capacitor C2 is not discharged. Then, the SCR (TH1) H1 → H2 → AC2 (+) → SC1 (TH1) gate → H1 → H2 → AC1 → H1 → H2 → Q1 base → Q1 emitter → C2 (-) → C2 (+) → R10 → S1 → S2 → R16 → VR1 → R17 → R5 → D → And the sensor voltage charging part 50 → R10 → S1 → S2 → R16 → R17 → R5 → D5 → Q1 base → Q1 emitter → C2 (-) → C2 (+) → SCR (TH1) gate → H1 → H2 The switching transistor Q1 is turned on and the trigger voltage capacitor C2 is discharged to generate a current in the gate of the SCR (TH1), thereby triggering the SCR (TH1) (H1, H2) are heated.

At this time, since only one switching transistor Q1 is used and the threshold voltage is 0.6 V, the operation deviation is minimized.

The temperature controller further includes an electric field sensing unit 150 for amplifying and outputting the electric potential sensed through the antenna ANT.

The electric field sensing unit 150 basically includes an antenna (ANT) for sensing an electric potential generated from the outside, and a transistor Q3 for receiving and amplifying the sensed signal through a resistor R1 as a base .

A diode D2 for preventing protection and malfunction of the circuit when an overvoltage or an overcurrent flowing instantaneously through the antenna ANT due to an external factor such as static electricity is generated between the resistor R1 and the transistor Q3 And a capacitor C1 for removing noise from a signal sensed by the antenna ANT.

The sense amplifier of the antenna ANT is first amplified through the transistor Q3 and then through the transistor Q5 whose base is connected to the collector of the transistor Q3 to which the resistor R19 and the capacitor C3 are connected And then amplified and output.

In addition, a darlington transistor is preferably used to improve the gain of the transistors Q3 and Q5.

Meanwhile, nilon-insulated heating lines are used between the heating lines connected to the heating unit 40 and the heating lines connected to the primary sides H1 and H2 and the sensing lines connected to the secondary sides S1 and S2, Using the hot wire method to detect the capacitor value of nylon, the nylon melts due to overheating, and automatically cut off the power when the heating wire and the sensing wire (or magnetic field canceling wire) are short-circuited.

However, in the present invention, a heating wire connected to the heating unit uses a muffler heating wire capable of blocking electromagnetic waves.

The non-magnetic heating line may be composed of a core material, a heating wire wound around the core material, an inner insulating material covering the heating wire, and an outer insulating material covering both the magnetic flux canceling wire wound by the inner insulating material.

The magnetic field canceling line is connected to the terminal side opposite to the heating line connected to the positive or negative terminal of the AC power source and receives a reverse phase current of the current flowing through the heating line from the same AC power source.

Accordingly, the magnetic field generated by the current flowing through the heating line and the magnetic field canceling line is reversed and the magnetic field center of the magnetic field canceling line coincides with the center of the magnetic field formed on the heating line, so that the magnetic fields having the same center and opposite directions can cancel each other have.

When the nylon polymer, which is an insulator that surrounds the heating wire, is melted by overheating, the heating wire and the magnetic field canceling wire connected to each other with the above structure are short-circuited to the heating wire and the magnetic field canceling wire outside to cut off the power supplied to the heating wire and magnetic field canceling wire It is preferable that the power control unit 300 is connected to the temperature controller.

Therefore, the heating mat provided with the temperature controller according to the present invention can realize a zero magnetic system by reversing the polarity of the generated magnetic field by reversing the current flow of the heating line and the magnetic field canceling line of the non-magnetic heating line. However, The temperature controller according to the present invention can prevent a safety accident such as a fire that may occur due to a short circuit between a heating line and a magnetic field canceling line through the power consumption cutoff unit 300 by zeroing the power consumption .

The power dissipation cut-off part 300 is connected in parallel to the heating part 40 which is a coupling point of the heating line and the magnetic field canceling line so that a forward voltage is generated when a current flows through the heating line and the magnetic field canceling line, One or two diodes D12 and D13 are connected.

At this time, only one of the diodes D12 and D13 having a large capacity may be used, and the reason why two diodes D12 and D13 are used is to disperse the heat generated in the diode.

Then, a booster diode D11 is connected in series to the anode of the one or two diodes D12 and D13.

And a switching transistor Q4 having a base connected to the anode of the booster diode D11, a collector connected to the output terminal of the reference voltage generating unit 30, and an emitter connected to the heating unit 40 .

A capacitor C8 is connected between the emitter and the collector of the switching transistor Q4 and a resistor R15 is connected to the collector of the switching transistor Q4 and the collector of the switching transistor Q4 and the resistor R15 The cathode is connected to the anode of the zener diode ZD2 and the diode D14 connected to the switching transistor Q1 of the comparison / tree rejection 110 is provided with a zener diode ZD2 to which the cathode is connected, do.

If a current flows normally through the non-magnetic heating line, a single diode may be used. However, a forward voltage is generated in the diodes D12 and D13 using two diodes due to heat generation. The booster diode D11 reinforces the weak voltage of the forward voltage, So that the voltage of the bolt is generated to drive the switching transistor Q4.

Then, the capacitor C8 is charged by the resistor R15 and the operation stop current which reaches the base of the switching transistor Q1 of the comparison / tree rejection 110 via the Zener diode ZD2 and the diode D14 is set to .

By doing so, the comparison / tree rejection 110 operates normally and the thermal mat operates normally.

Then, when the heating line and the magnetic field canceling line are short-circuited during the normal operation of the heating mat, both ends of one or two diodes D12 and D13 are short-circuited, and the driving voltage for driving the switching transistor Q4 0.5 volts (1.5 volts to 1 volt), so that the switching transistor Q4 is in an OFF state where it can not be driven.

The current charged in the capacitor C8 is supplied as an operation stopping current of the comparison / tree rejection 110 via the zener diode ZD2 and the diode D14 and is supplied from the comparison / tree rejection unit 110 to the output unit 80 The trigger signal transmitted to the SCR TH1 of the heat generating unit 40 is cut off and the power supplied to the heat generating unit 40 is cut off to prevent the heat generating unit 40 from generating heat, thereby preventing a safety accident such as a fire.

Further, when the SCR (TH1) of the output unit 80 is internally short-circuited as a diode after long time operation or self-failure, the switch function is lost and the half-wave current is all supplied to the heating wire due to the loss of the dividing function. Resulting in a fire hazard.

In order to detect such a case, the temperature controller includes an overheat cut-off part 170 for cutting off the AC power supplied to the heating mat.

The overheat cut-off portion 170 is connected to the heat generating resistor R23 and the thermal fuse TF1. When the thermal fuse TF1 is detected during overheat detection, the thermal fuse TF1 is melted and broken, thereby preventing the heating line from overheating.

On the other hand, even if the SCR (TH1) is not short-circuited, an error may occur that the heat generating resistor R23 generates heat and accordingly the thermal fuse TF1 is fused and disconnected. Even if an error such as a short-circuit has occurred, the thermal shutdown unit 170 may not operate properly and a fire may occur in the thermal mat.

Therefore, in order to prevent the occurrence of an error that the thermal resistor R23 generates heat and the thermal fuse TF1 is fused and disconnected even though the SCR (TH1) is not short-circuited, And a function sensing unit 500.

The heat generation prevention unit 190 is connected to the reference voltage generation unit 30 and includes a diode D4 and a resistor R20 connected in parallel so that the heat generation resistor R23 generates heat even when the SCR TH1 is not short- .

The sensor function sensing unit 500 includes a resistor R4 connected to the cathode of the SCR TH1 constituting the output unit 80 and a collector connected to the cathode of the SCR TH1 and having a collector connected to the cathode of the Zener diode ZD1, A transistor PC1 having an emitter connected to the thermal fuse TF1 and an SCR TH2 connected between the anode of the Zener diode ZD1 and the heating resistor R23.

A resistor R3 is connected between the resistor R4 and the collector of the transistor PC1 and a capacitor C9 is connected between the collector of the transistor PC1 and the resistor R3 and the anode of the zener diode ZD1 And the gate of the SCR (TH2).

The circuit including the comparison / tree rejection circuit 110 and the reference voltage generator 30 is a frequency divider circuit. In normal operation, positive power is applied to the anode of the SCR (TH1) of the output section 80 When the (-) power source is applied to the cannon, the temperature changes from 1/12 to 1/16 when the temperature rises.

If it is 1/4 frequency, the SCR (TH1) of the output unit 80 is turned on for one period only during four cycles of the sine wave power source.

The resistor R4 and the transistor PC1 are first connected to the cathode of the SCR TH1 for sensing the diode of the SCR TH1 of the output unit 80 so that the output of the SCR TH1 of the output unit 80 The current flowing through the resistor R4 and the transistor PC1 is stopped first and the secondary of the transistor PC1 is turned off so that the charging voltage of the capacitor C9 is increased and the Zener diode ZD1 is turned on, .

Then, as the SCR (TH2) is turned on and the heating resistor (R23) is heated, the thermal fuse (TF1) sealed up like the heating resistor (R23) is fused at the melting temperature and heated The supply of AC power which can be supplied is interrupted, and the occurrence of fire can be prevented.

According to the above-described self-diagnosis and temperature controller for a thermal mat having the overheat prevention function of the present invention, it is possible to grasp the functional defects of the SCR, which is an element constituting the output unit for supplying power to the heat generating unit, By shutting off the supply of power, it is possible to prevent a safety accident such as a fire by originally shutting off the heat generated through the heating wire.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It will be readily apparent that various substitutions, modifications, and alterations can be made herein.

10: AC power source detecting section 20: Power indicator
30: reference voltage generator 40:
50: sensor voltage charging part 80: output part
110; Comparison / tree rejection 130: sensor voltage setting section
150: electric field sensing unit 170:
190: heat generation prevention part 300: power consumption cutoff part
500: Sensor function detection unit

Claims (6)

An AC power supply for supplying a sine wave of a (+) half wave and a (-) half wave; A power indicator that is turned on by a voltage applied from the AC power supply unit and indicates whether power is supplied; A reference voltage generating unit for dividing an AC power supplied from the AC power supply unit and providing a reference voltage; A heating unit which receives an AC power from the AC power supply unit to generate heat and senses a temperature and varies a resistance value according to temperature; A sensor voltage charging / discharging unit for charging / discharging a voltage applied through the heating unit; A comparing / tree rejecting unit for comparing the charging voltage of the sensor voltage charging / discharging unit with the reference voltage of the reference voltage generating unit to supply and shut off the trigger voltage when the charging voltage is higher than the reference voltage; A sensor voltage setting unit that has a variable resistor and changes the AC resistance value according to a user setting to vary a charging voltage level of the sensor voltage charging unit to switch the comparison / tree rejection; And an output unit that is switched by a trigger voltage provided from the comparison / tree rejection and supplies power to the heating unit, the temperature controller including:
A heating resistor having an exothermic temperature value proportional to the exothermic temperature of the heat generating part and a thermal fuse installed to be in proximity to or in contact with the exothermic resistance and disconnected when the exothermic temperature is reached to interrupt the AC power supply; And a sensor function sensing unit connected between the overheat interruption unit and the output unit and configured to generate heat at a temperature of the heat generating resistor when the SCR provided in the output unit is determined to be defective in function, ; The sensor function sensing unit includes a resistor R4 connected to the cathode of the SCR that constitutes the output unit, a transistor whose base is connected to the cathode of the SCR constituting the output unit, the collector of which is connected to the cathode of the Zener diode and the emitter is connected to the thermal fuse And a resistor R3 is connected between the resistor R4 and the collector of the transistor PC1 and the transistor PC1 is connected between the collector of the transistor PC1 and the collector of the transistor PC1, and the other SCR (TH2) connected between the anode of the zener diode and the heat- And a resistor R13 is connected between the anode of the Zener diode ZD1 and the gate of the SCR (TH2), and a capacitor C9 is connected between the collector of the Zener diode ZD1 and the resistor R3. When the SCR provided in the output portion is determined to be defective in function, the Zener diode and the SCR (TH2) connected thereto are conducted, so that the exothermic resistance is generated at the exothermic temperature value. Wherein the heat generation prevention unit is formed by connecting a diode and a resistor in parallel to each other, and the heat generation prevention unit prevents an exothermic resistance from being generated during a normal operation of the SCR constituting the output unit; When the division of the SCR (TH1) of the output section stops, the cathode resistance R4 of the SCR (TH1) and the transistor PC1 are connected for detection of the diode of the output section SCR (TH1) The first current flowing through the transistor R4 and the transistor PC1 is stopped and the secondary of the transistor PC1 is turned off to increase the charging voltage of the capacitor C9 to turn on the zener diode ZD1 and the SCR The thermal fuse TF1 which is sealed up like the heat generating resistor R23 can be supplied with an alternating current power supply which can be fused at the melting temperature and supplied to the heat generating portion 40, Which can prevent the occurrence of a fire, is characterized by a self-diagnosis and a temperature controller for a thermal mat having an overheating prevention function. delete delete [2] The apparatus of claim 1, wherein the comparison / tree rejection is NPN-type in which the base is connected to the output terminal of the sensor voltage setting unit so that the comparison / tree rejection is switched by the voltage output from the sensor voltage setting unit, and an emitter is connected to the output terminal of the reference voltage generating unit A switching transistor; A base connected to a collector of the switching transistor for amplifying an output current of the switching transistor, a collector connected to the emitter of the switching transistor in common, and a PNP type transistor having an emitter connected to an output terminal of the AC power supply unit An amplifying transistor of the transistor; And a noise removing capacitor connected between the base and the emitter of the switching transistor so as to remove a pulse-shaped noise inputted to the base of the switching transistor, characterized in that the self- Temperature regulator for matte. The temperature controller for a heating mat according to claim 1, wherein the temperature controller for the self-diagnosis and the overheat prevention includes an antenna for sensing an electric potential generated from the outside, a transistor for receiving and amplifying the sensed signal through a resistor, A diode for preventing protection and malfunction of the circuit when an overvoltage or an overcurrent that is instantaneously introduced through the antenna due to an external factor such as static electricity is generated between the transistor and the transistor and a noise is removed from the signal detected by the antenna And an electric field sensing unit including a capacitor for controlling the temperature of the heating mat. The temperature controller according to claim 1, wherein the sensor voltage setting unit further comprises a damping resistor connected in parallel to reduce a variation in resistance value of the variable resistor.

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