KR101309387B1 - System for controlling temperature of heating-wire - Google Patents

Abstract

According to the present invention, a method of manufacturing a heating wire and a method of manufacturing the heating wire which make it possible to use nylon 6 or nylon 66 which is inexpensive as a nylon thermistor by coating and evaporating moisture absorbed in the nylon thermistor during the heating wire manufacturing process It relates to a heating wire. In addition, the present invention is to enable the temperature control of the heating wire in the state that all the moisture absorbed by nylon 6 or nylon 66 is not evaporated, by generating a reference point, that is, the reference voltage is low heat generated by the first heating wire, nylon 6 Or it relates to a temperature control system and method of the heating wire to enable the temperature control of the first heating wire in the state that all the moisture absorbed in nylon 66 is not evaporated.

Description

Temperature control system of heating wire {SYSTEM FOR CONTROLLING TEMPERATURE OF HEATING-WIRE}

The present invention relates to a method for manufacturing a heating wire and a heating control line and a temperature control system and method of the heating wire manufactured by the manufacturing method, and more particularly, in the production of heating wire, nylon 6 or nylon 66 having a high moisture absorption as a nylon thermistor A method of manufacturing a heating wire to be used, and a heating control wire and a temperature control system and method of the heating wire manufactured by the manufacturing method.

Today, the heating system is very diverse, and the area has been expanded from direct fires such as briquettes, stoves, stoves, and individual boilers in single-family homes, to indirect heating such as central heating in apartments such as apartments, and electric mats. In particular, the emergence of electric mats that use electricity as power among diversified heating appliances has made our heating culture more convenient. Such an electric mat is usually provided with a heating wire therein, the electrical energy is converted into thermal energy by the heating wire, thereby exhibiting a thermal insulation function.

1 is a view showing a conventional heating wire provided in the electric mat. Referring to FIG. 1, in a conventional heating wire, a ventricle 110 is positioned at a center thereof, and a first heating wire 112 is spirally wound around the ventricle 110. The first heating wire 112 wound around the ventricles 110 functions as a heat generator. A first coating 114 is provided outside the ventricle 110 and the first heating wire 112 to surround the ventricle 110 and the first heating wire 112. Then, the second heating wire 116 is wound around the first covering 114. Since the second heating wire 116 is a path in which the current input to the first heating wire 112 is u-turned out, the current flow direction of the first heating wire 112 and the second heating wire 116 is reversed, thereby inducing the induced magnetic field. It functions to shield. The outer side of the 2nd heating wire 116 is covered with the 2nd covering 118 formed from synthetic resin. The second sheath 118 serves to shield the electric field leaking between the second heating wires 116.

Here, the first coating 114 uses a negative temperature coefficient (NTC) thermistor, that is, a material whose resistance decreases with an increase in temperature, and mainly uses a nylon thermistor made of nylon. Since the nylon is sensitive to temperature during the temperature detection circuit and the resistance value changes, even if the first heating wire 112 is locally overheated, it affects the nylon located at the overheated portion, and the impedance change of the nylon thermistor By detecting the change in the current flowing through the second heating wire 116, the temperature is controlled according to the change in the current.

2 is a view showing the actual operating waveform of the temperature controller of the conventional heating line.

Referring to the drawings, the temperature controller of the conventional heating wire performs the heating operation during the negative half cycle of the AC power source, and the temperature of the heating wire is controlled by the NTC thermistor which is the first covering 114 for the next positive half cycle. Measure Since the NTC thermistor is used as the first sheath 114 of the heating wire, the impedance of the first sheath 114 is reduced when the first heating wire 112 and the second heating wire 116 are heated for a negative half period of the AC power source. Lowers. Therefore, the temperature signal voltage across the NTC thermistor 114 with the lowered impedance is lowered during the next half cycle in which the AC power has a positive phase. Therefore, the temperature controller does not output the drive signal when the temperature signal voltage is lower than the reference voltage, and the heating is stopped. When the heating of the first heating wire 112 is stopped and the temperature of the first heating wire 112 is lowered, the impedance of the first covering 114 is increased, and the temperature signal voltage becomes higher than the reference voltage. At this time, the temperature controller again outputs a driving signal to heat the first heating wire 112 and the second heating wire 116 again.

On the other hand, the NTC thermistor of the nylon 12 series has been mainly used as the 1st covering 114 of the heating wire conventionally. Nylon 12 series NTC thermistors have the advantage of low insulation coefficient because they do not absorb moisture. However, the nylon 12 is expensive, there is a problem that increases the price of the heating wire. Accordingly, studies are being conducted to use inexpensive nylon 6 or nylon 66 series NTC thermistors as the first coating 114, instead of expensive nylon 12.

3 is a graph showing a voltage change with a change in moisture content by drying of nylon 6 or nylon 66 in a time versus voltage graph. Referring to the drawings, nylon 6 or nylon 66 has a high water absorption rate, the initial insulation coefficient is low, and thus the initial impedance value is lower than nylon 12. After a certain time, the moisture in nylon 6 or nylon 66 is evaporated over time by the heat generation of the first heating wire 112 and the second heating wire 116, and as the moisture evaporates, the insulation coefficient As high as nylon 12, the impedance value will be similar to nylon 12.

On the other hand, when the temperature of the first heating wire 112 decreases during the temperature detection circuit operation, the impedance of the first covering 114 becomes high, and the temperature signal voltage becomes higher than the reference voltage, thereby driving signals are output. The first heating wire 112 is configured to be heated again.

By the way, nylon 6 or nylon 66 has a low insulation coefficient until all of the moisture evaporates, thereby lowering the impedance value, thereby lowering the measured voltage. However, this lowered measured voltage is measured lower than the reference voltage for starting heating. If the temperature measurement voltage is lower than the reference voltage, the temperature controller does not output the drive signal and thus does not perform the heating operation.

When a heating wire is constructed by using nylon 6 or nylon 66 series NTC thermistors instead of nylon 12, the heating operation is performed because the measured temperature signal voltage is lower than the reference voltage due to the high water absorption of the NTC thermistors of nylon 6 or nylon 66. There was a problem that does not perform.

An object of the present invention for solving the above problems of the prior art is to evaporate the moisture absorbed in nylon 6 or nylon 66 before the second coating treatment on the second heating wire of the heating wire, the impedance of nylon 6 or nylon 66 It is to provide a method for manufacturing a heating wire and a heating wire manufactured by the manufacturing method so that the value is constantly measured according to the temperature signal voltage.

In addition, another object of the present invention is to change the reference point at which the first heating wire is heated according to the time that the moisture absorbed in nylon 6 or nylon 66 is evaporated, so that all of the moisture absorbed in nylon 6 or nylon 66 is not evaporated. In this state, the first heating wire and the second heating wire are heated, and the moisture of the NTC thermistor is increased by the heating of the first and second heating wires, so that the moisture of the NTC thermistor can be simply heated without continuing to dry the NTC thermistor. It is to provide a temperature control system and method of a heating wire to evaporate to normal operation.

In order to achieve the above object, the present invention provides a heating wire including a ventricle, a first heating wire wound on the ventricle, a nylon thermistor made of nylon surrounding the first heating wire, and a second heating wire wound on the outside of the nylon thermistor. A manufacturing method, comprising: a first winding step of winding the first heating wire around the ventricle; A first covering step of wrapping a nylon thermistor outside the first heating wire; A second winding step of winding a second heating wire outside the nylon thermistor to produce a heating wire; Drying the hot wire to evaporate moisture absorbed in the nylon thermistor; And a second coating step in which the coating is wrapped around the dried outside of the heating wire.

In addition, the drying step, provides a method for producing a heating wire, characterized in that to evaporate the moisture absorbed in the nylon thermistor by hot air drying.

In addition, the nylon thermistor provides a method for producing a heating wire, characterized in that comprising a nylon 6 or nylon 66 material.

In addition, the present invention provides a heating wire manufactured by the method of manufacturing the heating wire.

The present invention also provides a temperature control system for controlling a temperature of a heating wire including a first heating wire, an NTC thermistor made of nylon surrounding the first heating wire, and a second heating wire wound outside the NTC thermistor. A temperature detector detecting a temperature signal voltage according to a resistance value of the NTC thermistor according to the temperature of the first heating wire and the second heating wire; A controller for outputting a driving signal by comparing the temperature signal voltage detected by the temperature detector with a preset reference voltage; And a power supply unit for outputting a heating current to the first heating wire side according to a driving signal output from the control unit, wherein the control unit comprises: a reference voltage generator for outputting the reference voltage; A comparison detector for comparing the reference voltage output from the reference voltage generator with the temperature signal voltage and outputting the driving signal when the temperature signal voltage is higher than the reference voltage; A first storage unit configured to store a predetermined threshold value according to a set temperature after the moisture absorbed by the NTC thermistor is evaporated, so that the first heating wire becomes a reference for generating heat; And a second storage unit configured to store a reference value lower than a temperature signal voltage detected by the temperature detector, wherein the reference voltage generator outputs the reference value as the reference voltage when the reference value is less than the threshold value, and stores the reference value. When the threshold value is equal to or greater than the threshold value, the threshold value is output as the reference voltage.

The present invention also provides a temperature control system for a heating wire including a control rectifier connected to allow a heating current by a negative half cycle of the AC power of the power supply to flow from the second heating wire to the first heating wire.

In addition, the NTC thermistor provides a temperature control system of the heating wire, characterized in that comprises a nylon 6 or nylon 66 material.

The present invention also provides a temperature control method for controlling a temperature of a heating wire including a first heating wire, an NTC thermistor made of nylon 6 or nylon 66 surrounding the first heating wire, and a second heating wire wound around the NTC thermistor. A temperature signal detecting step of detecting a temperature signal voltage output from the first heating wire by a temperature detector; An initial value storing step of storing the temperature signal voltage detected by the temperature detector as a reference value; Generating a reference voltage by comparing a reference value with a predetermined threshold value after the evaporation of moisture absorbed by the NTC thermistor from the control unit to be a reference for generating a first heating wire according to a set temperature; A driving signal output step of comparing the temperature signal voltage detected by the temperature detection unit with the reference voltage in the control unit and outputting a driving signal when the temperature signal voltage is higher than the reference voltage; And a heating current output step of outputting a heating current from the power supply unit to the first heating wire side according to a driving signal output from the control unit, wherein the reference voltage generating step includes generating the reference value when the reference value is less than the threshold value. And outputs the threshold value as the reference voltage when the reference voltage is output and the reference value is greater than or equal to the threshold value.

The heating current outputting step may provide a temperature control method of a heating line, wherein the heating current flows from the second heating wire connected to the power source to the first heating wire side by the driving signal.

In addition, the heating current output step, by the drive signal, a heating current flows from the first heating wire connected to the power supply to the power supply side provides a temperature control method of a heating wire.

Method for producing a heating wire according to the invention and the heating wire produced by the manufacturing method using nylon 6 or nylon 66 with a lot of water absorption as a nylon thermistor, by evaporating all the water absorbed in nylon 6 or nylon 66 in the manufacturing process , Nylon 6 or nylon 66 has an effect that the impedance value is constantly measured according to the temperature signal voltage.

In addition, the temperature control system and method of the heating wire according to the present invention, even if the NTC thermistor composed of nylon 6 or nylon 66 absorbs moisture, so that even if the detected temperature signal voltage is measured to be low, By generating a low voltage, there is an effect that temperature control of the first heating wire can be performed in a state where all of the moisture absorbed in nylon 6 or nylon 66 is not evaporated.

1 is a view showing a conventional heating wire provided in the electric mat.
2 is a view showing the actual operating waveform of the temperature controller of the conventional heating line.
3 is a graph showing the impedance value according to the current change of nylon 6 or nylon 66.
4 is a schematic diagram schematically showing a method of manufacturing a heating wire according to a first preferred embodiment of the present invention.
5 is a flowchart schematically illustrating a method of manufacturing a heating wire according to a first embodiment of the present invention.
6 is a block diagram illustrating a heating line temperature control system according to a second preferred embodiment of the present invention.
7 is a circuit diagram of a heating circuit unit of a temperature control system of a heating line according to a preferred embodiment of the present invention.
FIG. 8 is a diagram showing an equivalent circuit diagram of a heating circuit unit of the temperature control system of the heating line shown in FIG. 7.
9 is a view illustrating a process of generating a reference voltage by comparing a reference value and a threshold value in a control unit of a temperature control system of a heating line according to a second embodiment of the present invention.
FIG. 10 is a flowchart schematically illustrating a method for controlling a temperature of a heating line according to a second exemplary embodiment of the present invention.

Hereinafter, a method of manufacturing a heating wire and a heating wire manufactured by the manufacturing method according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in more detail.

4 is a schematic diagram showing a manufacturing method of a heating wire according to a first preferred embodiment of the present invention, Figure 5 is a flow chart schematically showing a manufacturing method of a heating wire according to a second preferred embodiment of the present invention.

4 and 5, in the manufacturing method of the heating wire 10 according to the first preferred embodiment of the present invention, the first heating wire 12 is wound along the outer periphery of the ventricle 11 formed to be elongated in the longitudinal direction ( S1), the nylon thermistor 14 made of nylon is wrapped along the outer side of the ventricle 11 and the first heating wire 12 (S2). Here, the nylon thermistor 14 is made of nylon 6 or nylon 66 material which is cheaper than nylon 12. And the second heating wire 16 is wound outside the nylon thermistor 14 is made of a heating wire (S4). Thereafter, the hot wire is introduced into the hot air dryer 19, and the hot air dryer 19 generates hot air to evaporate the moisture absorbed by the nylon thermistor 14 of the hot wire (S6). And the heating line is completed by wrapping the coating 18 made of synthetic resin material such as PVC outside the second heating wire 16 of the heating wire (S8).

As described above, the present invention uses nylon 6 or nylon 66 having a lot of water absorption as the nylon thermistor 14 in manufacturing the heating wire 10, by evaporating moisture absorbed by nylon 6 or nylon 66 in the manufacturing process, When the temperature of the first heating wire 12 increases or decreases, the impedance value of nylon 6 or nylon 66 is constantly measured according to the corresponding temperature signal voltage without being influenced by moisture, thereby making it difficult to control the temperature of the heating wire. There is a vertex where this does not occur.

Hereinafter, with reference to the accompanying drawings will be described in more detail the temperature control system and method of the heating wire according to a preferred embodiment of the present invention.

6 is a block diagram of a heating element temperature control system according to a second preferred embodiment of the present invention, and FIG. 7 is a circuit diagram of a heating circuit part of a heating element temperature control system according to a preferred embodiment of the present invention. 8 is an equivalent circuit diagram of a heating circuit part of the temperature control system of the heating line shown in FIG. 7.

6 to 8, the temperature control system of the heating wire according to the second preferred embodiment of the present invention includes a heating circuit unit 60 and a control unit 40. The heating circuit unit 60 includes a power supply unit 2 that supplies power, a heating unit 5, a resistor 25, and a temperature detector 30.

The heating unit 5 includes a heating line 10 ′ and first and second control rectifiers 20 and 22. The heating line 10 ′ is used for an electric mat and the like, and surrounds the ventricle 11, the first heating wire 12 wound along the outer periphery of the ventricle 11, and the first heating wire 12, and the temperature rises. The insulating material surrounding the NTC thermistor 14 ′, the second heating wire 16 wound along the outer circumference of the NTC thermistor 14 ′, and the second heating wire 16 as the resistance 25 decreases. Covering 18 that is constructed. Since the second heating wire 16 is a path in which the current input from the power supply unit 2 to the first heating wire 12 is u-turned out, the current flow direction of the first heating wire 12 and the second heating wire 16 is opposite. And a function of shielding the induction magnetic field. The sheath 18 is made of a conductive synthetic resin and has a function of shielding an electric field leaking between the second heating wires 16.

In addition, NTC thermistor 14 'is preferable to use a low-cost nylon 6 or nylon 66 series instead of expensive conventional nylon 12. However, as is known, nylon 6 or nylon 66 has a high water absorption. Therefore, until all moisture absorbed by nylon 6 or nylon 66 is evaporated, the insulation coefficient of the NTC thermistor 14 'is low and the impedance of the NTC thermistor 14' is lowered. Accordingly, in the present invention, the reference point at which the first heating wire 12 generates heat, that is, the reference voltage, is changed over time so that the moisture absorbed in the nylon 6 or nylon 66 evaporates, and thus the nylon 6 or nylon 66 series NTC thermistor ( In the state where all of the moisture absorbed by 14 ') has not evaporated, the temperature of the first heating wire 12 can be adjusted. This will be described again later.

The first control rectifier 20 is connected in parallel with a resistor 25, which will be described later, is turned on by a drive signal of the controller 40, and is connected to the power supply unit 2 in a negative half cycle of the AC power. The heating current flows from the one end C of the first heating wire 12 connected to the power supply unit 2. In addition, the first control rectifier 20 cuts off the flow of current from the power supply unit 2 directly to the first heating wire 12 in a half cycle of the positive (+) AC power to disconnect the resistor 25 and the first heating wire 12. Allow current to flow through it. The first control rectifier 20 may be formed of a silicon-controlled rectifier (SCR) for power control.

The second control rectifier 22 is positioned between the first heating wire 12 and the second heating wire 16, and is turned on by a drive signal of the control unit 40, so that the negative half cycle of the AC power source is negative. Heating current is connected to pass from one end D ″ of the second heating wire 16 to the other end C ″ of the first heating wire 12. In addition, the second control rectifier 22 blocks the current flowing directly to the second heating wire 16 through the first heating wire 12 in the positive half cycle of the AC power supply, thereby heating the first heating wire 12 and the NTC thermistor. An electric current flows through the 14 'and the second heating wire 16. The second control rectifier 22 may be formed of a diode or the like.

One end of the resistor 25 is connected in parallel with the first control rectifier 20 at one end of the first heating wire 12, and the other end thereof is connected to the power supply 2.

As illustrated in FIG. 5, the temperature detector 30 uses the voltage signal divided by the impedance of the NTC thermistor 14 ′, which is changed by the temperature of the resistor 25, the first heating wire 12, and the second heating wire 16. Voltage is detected, and the detected temperature signal voltage is output to the comparison detector 42 and the reference voltage generator 44.

The controller 40 outputs the driving signal when the temperature signal voltage output from the temperature detector 30 is greater than the reference voltage. The controller 40 may include the first and second storage units 45 and 46, the reference voltage generator 44, and the comparison detector. (42).

After all of the moisture absorbed by the NTC thermistor 14 'is evaporated, the first storage unit 45 stores a predetermined threshold value so that the first heating wire 12 generates a reference according to the set temperature. The second storage unit 46 stores a reference value lower than the temperature signal voltage transmitted from the reference voltage generator 44 to be described later.

The reference voltage generator 44 generates a reference value having a lower voltage based on the temperature signal voltage output from the temperature detector 30, and stores the generated reference value in the second storage unit 46. In addition, the reference voltage generator 44 generates and outputs a reference voltage. When the reference value stored in the second storage unit 46 is less than the threshold value stored in the first storage unit 45, the reference voltage is output as a reference voltage. If the reference value is greater than or equal to the threshold value, the threshold value is output as a reference voltage. If the reference value is less than the threshold value, since the moisture remains in the NTC thermistor 14 ', the insulation coefficient of the NTC thermistor 14' is low and the temperature signal voltage is measured low. Accordingly, the reference voltage generator 44 controls and outputs the reference voltage to a reference value lower than the temperature signal voltage. On the contrary, when the reference value is greater than or equal to the threshold value, since no moisture remains in the NTC thermistor 14 ', the temperature signal voltage is normally measured. Accordingly, the reference voltage generator 44 controls and outputs the reference voltage as a threshold value.

The comparison detector 42 compares the reference voltage output from the reference voltage generator 44 with the temperature signal voltage detected by the temperature detector 30, and outputs a driving signal when the temperature signal voltage is higher than the reference voltage.

9 is a view illustrating a process of generating a reference voltage by comparing a reference value and a threshold value in a control unit of a temperature control system of a heating line according to a second embodiment of the present invention.

Referring to the drawings, the first storage unit 45 of the control unit 40 has a predetermined threshold value so that the first heating wire 12 generates heat after all of the moisture absorbed by the NTC thermistor 14 'is evaporated. Is stored. The reference value controlled to be lower than the temperature signal voltage detected by the temperature detector 30 is stored in the second storage unit 46.

The reference voltage generator 44 of the controller 40 generates a reference voltage depending on whether the reference value exceeds a threshold. For example, when the reference value is less than the threshold value (reference value 1 and reference value 2), the moisture absorption absorbed in nylon 6 or nylon 66 is relatively high and the initial insulation coefficient is low. Accordingly, the reference voltage is not a threshold value. It becomes reference value 1 and reference value 2. When the reference value is equal to or greater than the threshold value (reference value 3), all moisture absorbed in nylon 6 or nylon 66 is evaporated, and thus the reference voltage becomes a threshold value.

As described above, according to the present invention, the reference voltage is variably controlled depending on whether the reference value exceeds the threshold value, so that the NTC thermistor made of nylon 6 or nylon 66 absorbs moisture, so that the detected temperature signal voltage is low. Even if the first heating wire generates a low reference voltage that generates heat, it is possible to control the temperature of the first heating wire while all of the moisture absorbed by the nylon 6 or nylon 66 is not evaporated.

Hereinafter, a temperature control method of a heating wire according to a second preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

FIG. 10 is a flowchart schematically illustrating a method for controlling a temperature of a heating line according to a second exemplary embodiment of the present invention.

Referring to the drawings, the temperature control method of the heating wire according to a second embodiment of the present invention, after the power is turned on (S10) in the power supply unit (S10), the power having a positive phase of the heating unit When applied to (5), the voltage controlled by the resistor 25 is applied to the NTC thermistor 14 'between the first heating wire 12 and the second heating wire 16. The potential across the NTC thermistor 14 'is output to the temperature detector 30, and the temperature detector 30 detects this as the temperature signal voltage, so that the comparison detector 42 and the reference voltage generator 44 of the controller 40 are detected. (S12). The reference voltage generator 44 generates a value lower than the temperature signal voltage as a reference value, and stores the generated reference value in the second storage unit 46 (S14). Subsequently, the reference voltage generator 44 compares the reference value stored in the second storage unit 46 with the threshold value stored in the first storage unit 45 (S16), and when the reference value is less than the threshold value, the reference value is determined. The reference voltage is generated (S18), and the generated reference voltage is output to the comparison detection unit 42 (S20). If the reference value is greater than or equal to the threshold in step S16, the threshold is generated as a reference voltage (S19), and the generated reference voltage is output to the comparison detector 42 (S20). The comparison detector 42 compares the temperature signal voltage output from the temperature detector 30 with the reference voltage output from the reference voltage generator 44 (S22), and outputs a driving signal when the temperature signal voltage exceeds the reference voltage. (S24) Then, the first and second control rectifiers 20 and 22 are turned on, so that a power source having a negative phase flows to the first heating wire 12 so that the first heating wire 12 is heated.

As described above, the present invention uses the NTC thermistor 14 'composed of nylon 6 or nylon 66 to absorb moisture, so that even if the detected temperature signal voltage is measured low, the reference point at which the first heating wire 12 generates heat is referred to as a reference point. By generating a low voltage, there is an advantage that the temperature control of the first heating wire 12 is possible in a state in which the moisture absorbed by nylon 6 or nylon 66 is not all evaporated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

2: power supply unit 5: heating unit
10, 10 ': heating wire 11: ventricle
12: 1st heating wire 14, 14 ': nylon thermistor
16: 2nd heating wire 18: cloth
19: hot air dryer 20: first control rectifier
22: second control rectifier 25: resistance
30: temperature detector 40: controller
42: comparison detector 44: reference voltage generator
45: first storage unit 46: second storage unit

Claims (10)

A temperature control system for controlling a temperature of a heating wire including a first heating wire, a NTC thermistor made of nylon surrounding the first heating wire, and a second heating wire wound around the NTC thermistor.
A temperature detector detecting a temperature signal voltage according to a resistance value of the NTC thermistor according to the temperature of the first heating wire and the second heating wire;
A controller for outputting a driving signal by comparing the temperature signal voltage detected by the temperature detector with a preset reference voltage; And
A power supply unit for outputting a heating current to the first heating wire side according to a driving signal output from the controller,
The control unit includes:
A reference voltage generator for outputting the reference voltage;
A comparison detector for comparing the reference voltage output from the reference voltage generator with the temperature signal voltage and outputting the driving signal when the temperature signal voltage is higher than the reference voltage;
A first storage unit configured to store a predetermined threshold value according to a set temperature after the moisture absorbed by the NTC thermistor is evaporated, so that the first heating wire becomes a reference for generating heat; And
A second storage unit for storing a reference value lower than a temperature signal voltage detected by the temperature detector;
The reference voltage generator,
If the reference value is less than the threshold value, output the reference value to the reference voltage,
Outputting the threshold value as the reference voltage when the reference value is greater than or equal to the threshold value,
The NTC thermistor is a heating wire temperature control system, characterized in that it comprises a nylon 6 or nylon 66 material.
The method of claim 1,
And a control rectifier connected to the heating current by the negative half-cycle of the AC power supply of the power supply unit to flow from the second heating wire to the first heating wire. delete delete delete delete delete delete delete delete

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