Apparatus and method for full-wave alternating current heating and thermosensitive non-magnetic temperature control

Abstract

The present invention relates to a thermosensitive temperature control apparatus and method and, more particularly, to a full-wave alternating current heating and thermosensitive temperature control apparatus and method that heat a heating wire using the full wave of alternating current via switching means respectively provided at both ends of the heating wire, suspend the heating operation by turning off the switching means at predetermined time intervals, and, while the heating operation is suspended, measure at least one of a leakage current and a temperature of the heating wire and terminate the heating operation when an abnormal condition is detected.

Description

AC electromagnetic wave heating thermal non-magnetic field temperature control device and method

[0001] The present invention relates to a thermal temperature control device and method, and more specifically, to an AC propagation heating thermal temperature control device and method that heats a heating wire through the propagation of AC power via switching means configured at each end of the heating wire, stops the heating operation by turning off the switching means at regular time intervals, and measures one or more of the leakage current and temperature of the heating wire while the heating operation is stopped, and if an abnormality is detected, alarms or turns off the power to eliminate the possibility of fire.

[0002] Due to the increase in leisure time and the COVID-19 situation, the popularity of camping has skyrocketed, leading to a rapid increase in sales of electric mats using heating wires.

[0003] Typically, the heating wire of an electric mat is formed by winding a primary heating wire onto a core to form a non-magnetic field, covering the primary heating wire with a polyamide thermistor, winding a secondary heating wire onto the polyamide thermistor, and covering the top with a covering.

[0004] A general temperature control device is configured such that the direction of the current flowing through the primary heating wire and the secondary heating wire is opposite to form a non-magnetic field during the heating operation of the heating wire. To achieve this, the direction of current flow is controlled by connecting the primary heating wire and the secondary heating wire at one end of the heating wire with a diode, and the device is configured to heat the heating wire during half of the alternating current and measure the temperature during the other half of the alternating current to measure the temperature of the heating wire.

[0005] As described above, conventional temperature control devices use half-waves of AC power during the heating operation of the heating wire, so the current applied to the power control thyristor and diode is high, which can generate heat in the power control thyristor and diode, and consequently, there is a problem that the thyristor may fail.

[0006] To address this, conventional temperature controllers require a cooling design to cool power control diodes and thyristors, which leads to the problem of high production costs for the temperature controller.

[0007] In addition, conventional temperature control devices short-circuit one end of the heating wire to generate heat without a magnetic field, so they cannot detect and control the local leakage current between the primary and secondary heating wires, which can cause fire accidents due to leakage current.

[0008] Accordingly, the objective of the present invention is to provide an AC propagation heating thermal temperature control device and method that heats a heating wire in response to the propagation of AC through switching means configured at each end of the heating wire, stops the heating operation by turning off the switching means at regular time intervals, and measures at least one of the impedance and temperature of the heating wire while the heating operation is stopped, and if an abnormality is detected, an alarm is given or the power is turned off.

[0009] An AC electromagnetic heating thermal temperature control device according to the present invention for achieving the above-mentioned purpose comprises: a heating wire including a primary heating wire wound around a core, a polyamide thermistor wrapping the upper portion of the primary heating wire, and a secondary heating wire wound around the upper portion of the polyamide thermistor; a first switching unit, one end of which is connected to one end of an AC power supply unit that supplies AC power and the other end of which is connected to one end of the primary heating wire and is turned on or off according to a trigger signal; a second switching unit, one end of which is connected to the other end of the primary heating wire and the other end of which is connected to one end of the secondary heating wire and is turned on or off according to the trigger signal; an impedance detection unit configured such that one end is connected to the heating wire and the other end is grounded, and measures and outputs a leakage current through the polyamide thermistor of the heating wire when the first switching unit and the second switching unit are turned off; and a DC power supply unit that converts the AC power into DC power. The device is characterized by including a control unit that operates by receiving the above DC power to turn on the first switching unit and the second switching unit to supply AC power to the heating wire to heat the heating wire with respect to the propagation of AC power, and then turns off the first switching unit and the second switching unit at a certain time period and measures the leakage current between the heating wires through the impedance detection unit.

[0010] The above impedance detection unit is characterized by having one end connected to one end of the primary heating wire.

[0011] The impedance detection unit is characterized by having one end connected to the other end of the secondary heating wire.

[0012] The first switching unit comprises: a triac having a gate terminal, one end of which is connected to one end of an AC power supply unit and the other end of which is connected to one end of a primary heating wire and one end of an impedance detection unit, and which is turned on or off by receiving the trigger signal through the gate terminal; and a trigger input unit connected to both ends of the triac and the gate terminal, and which inputs the trigger signal output from the control unit to the gate terminal.

[0013] The second switching unit comprises: a triac having a gate terminal, one end of which is connected to the other end of a primary heating wire and the other end of which is connected to one end of a secondary heating wire, and which is turned on or off by receiving the trigger signal through the gate terminal; and a trigger input unit connected to both ends of the triac and the gate terminal, and which inputs the trigger signal output from the control unit to the gate terminal.

[0014] The trigger input unit is characterized by including a photocoupler comprising a light receiving unit, one end of which is connected to one end of the triac and the other end of which is connected to the other end of the triac and a gate terminal to receive light and output a trigger signal corresponding to the received light to the gate terminal of the triac, and a light emitting unit that receives the trigger signal, emits light, and transmits it to the light receiving unit.

[0015] The impedance detection unit comprises: a second resistor (21) connected to the other end of a first resistor (20), one end of which is connected to one end of the AC power supply unit, and one end of which is connected to the first heating wire; and a third resistor (22) whose one end is connected to the other end of the second resistor (21) and whose other end is grounded, so that the second resistor (21) and the third resistor (22) are equivalently connected in parallel to the polyamide thermistor (16), and the current value for the voltage applied to the third resistor (22) is output to the control unit as a leakage current value leaking through the polyamide thermistor between the two heating wires of the heating wire.

[0016] The above device further comprises: an NTC thermistor connected in parallel with a temperature-combined impedance resistor, which is a resistance component of the polyamide thermistor (16) connected in parallel with the second resistor (21) and the third resistor (22); and a temperature measuring unit including a third switching unit, one end of which is connected between one end of the temperature-combined impedance resistor and one end of the NTC thermistor and is turned on or off under the control of the control unit, wherein the control unit turns on the third switching unit when a temperature measurement event occurs and measures the temperature through the NTC thermistor.

[0017] The impedance detection unit comprises: a second resistor (21) connected to the other end of a first resistor (20), one end of which is connected to one end of the AC power supply unit, and to one end of the first heating wire; a third resistor (22), one end of which is connected to the other end of the second resistor (22) and the other end of which is grounded; and an NTC thermistor connected in parallel with the temperature composite impedance resistance between the first heating wire and the second heating wire, which is the resistance component of the polyamide thermistor, so as to output the voltage value of the fifth resistor according to the temperature of the heating wire to the control unit as the temperature value of the heating wire during heating operation.

[0018] A thermal temperature control method for AC propagation heating according to the present invention for achieving the above-mentioned purpose comprises: a counting process in which a control unit initializes a leakage current detection time at which power is supplied and then counts the leakage current detection time; an AC propagation heating process in which the control unit turns on a first switching unit and a second switching unit until the leakage current detection time being counted exceeds a preset time to supply AC current to a heating wire and heat the heating wire through the propagation of AC current; a heating stop process in which the control unit turns off both the first switching unit and the second switching unit to stop heating the heating wire when the leakage current detection time exceeds a preset time; a leakage current measurement process in which the control unit measures the leakage current between the primary heating wire and the secondary heating wire of the heating wire through an impedance detection unit after stopping the heating; and a fire prevention process in which the control unit turns off the AC power to stop operation when the measured leakage current exceeds a preset reference value.

[0019] The above control unit is characterized by repeating the counting process and the AC propagation heating process after a certain period of time if the measured leakage current is less than a reference value.

[0020] The above method is characterized by further including: a temperature measurement process in which, if the measured leakage current is less than a reference value, the control unit turns on a third switching unit in the heating stop state to measure the temperature of the heating wire through an NTC thermistor; and a second fire prevention process in which, if the measured temperature of the heating wire exceeds a preset reference value, the control unit turns off the AC power to terminate the operation.

[0021] Since the present invention heats the heating wire in response to the propagation of alternating current, it is not necessary to supply a high current to the switching means for power control corresponding to the conventional thyristor, so it has the effect of not necessarily having to perform a cooling design for the switching means for power control.

[0022] In addition, since it is not necessary to supply a high current to the switching means for power control, heat generation of the switching means for power control can be prevented, and thus, the failure of the temperature control device caused by this can be prevented.

[0023] In addition, the present invention has the effect of being able to measure leakage current between the primary heating wire and the secondary heating wire of the heating wire by turning off and opening both ends of the heating wire at regular time intervals.

[0024] In addition, the present invention has the effect of measuring the temperature of a heating wire more precisely by optionally configuring an NTC thermistor in parallel with a leakage current measuring means to measure the temperature of the heating wire.

[0025] FIG. 1 is a diagram showing the configuration of an alternating current radio wave heating thermal temperature control device according to the present invention.

[0026] FIG. 2 is a detailed circuit diagram of an AC electromagnetic heating thermal temperature control device according to one embodiment of the present invention.

[0027] FIG. 3 is a diagram showing a heating wire heating configuration when a triac is used as a switching means for power control of an AC electromagnetic heating thermal temperature control device according to one embodiment of the present invention.

[0028] FIG. 4 is a diagram showing a heating wire heating configuration conceptually illustrating a switching means for power control of an AC electromagnetic heating thermal temperature control device according to one embodiment of the present invention.

[0029] FIG. 5 is a diagram showing the leakage current detection configuration of an AC electromagnetic heating thermal temperature control device according to the present invention.

[0030] FIG. 6 is a diagram showing the temperature measurement configuration of an AC electromagnetic heating thermal temperature control device according to the present invention.

[0031] Figure 7 is a graph showing the temperature characteristics relative to the impedance characteristics of the polyamide thermistor and NTC thermistor of the heating wire of the AC electromagnetic wave heating thermal temperature control device according to the present invention.

[0032] FIG. 8 is a flowchart illustrating an alternating current propagating heat thermal temperature control method according to one embodiment of the present invention.

[0033] The configuration of the AC electromagnetic heating thermal temperature control device according to the present invention is described below with reference to the attached drawings, and a method for controlling the temperature in the device is described.

[0034] FIG. 1 is a diagram showing the configuration of an AC electromagnetic heating thermal temperature control device according to the present invention; FIG. 2 is a diagram showing a detailed circuit diagram of an AC electromagnetic heating thermal temperature control device according to an embodiment of the present invention; FIG. 3 is a diagram showing the heating wire heating configuration when a triac is used as a switching means for power control of an AC electromagnetic heating thermal temperature control device according to an embodiment of the present invention; and FIG. 4 is a diagram showing the heating wire heating configuration conceptually illustrating the switching means for power control of an AC electromagnetic heating thermal temperature control device according to an embodiment of the present invention. The following description will be explained with reference to FIG. 1 to 4.

[0035] The AC electromagnetic heating thermal temperature control device according to the present invention comprises a DC power supply unit (2), an input / output layer (3), a control unit (4), a heating wire (5), a first switching unit (8), a second switching unit (9), and an impedance detection unit (40), and according to an embodiment, further comprises a temperature measuring unit (30) and a switching unit abnormality detection unit (60).

[0036] The above DC power conversion unit (2) receives AC power from the AC power supply unit (1) and converts the AC power into DC power such as 5V, 3.3V, and outputs it.

[0037] The input / output layer (3) may include an input means including one or more buttons, switches, etc., and a display means for displaying and alarming the operating status of the temperature control device, the measured leakage current, the heating wire temperature, etc.

[0038] The heating wire (5) includes a primary heating wire (15) wound on a core (14), a polyamide thermistor (16) wrapping the primary heating wire (15), a secondary heating wire (17) wound on the upper part of the polyamide thermistor (16), and a covering that covers the upper part of the secondary heating wire (17).

[0039] The above polyamide thermistor (16) may be composed of a material whose resistance decreases with increasing temperature, mainly including polyamide 6 to 12, 66, etc.

[0040] As shown in FIGS. 2 to 4, one end of the first switching unit (8) is connected to one end of the AC power supply unit (1) and the other end is connected to one end of the primary heating wire (15), and is connected in parallel to the first resistor (20), which is a bias resistor for impedance detection.

[0041] One end of the second switching unit (9) is connected to the other end of the primary heating wire (15) and the other end is connected to one end of the secondary heating wire (17). At this time, the other end of the secondary heating wire (17) is connected to ground, which is the other end of the AC power source.

[0042] Each of the first switching unit (8) and the second switching unit (9) includes a triac (10, 11) and a trigger input unit (13) for each of the triacs (10, 11) as shown in FIG. 2.

[0043] One end (Terminal 1, T1) of the first triac (10) is connected to one end of the AC power supply unit (1) and the other end (Terminal 2, T2) is connected to one end of the primary heating wire (15) of the heating wire (5), and the gate terminal is connected to the trigger input unit (13), so that when a trigger signal is input from the trigger input unit (13), it is turned on or off depending on whether a trigger signal is input, thereby supplying or cutting off the AC power to the primary heating wire (15).

[0044] The trigger input unit (13) may be composed of a photocoupler (13) including a light receiving unit, which has one end connected to one end of the triac (10, 11) and the other end connected to the other end of the triac (10, 11) and the gate terminal to receive light and output it as a trigger signal to the gate terminal of the triac (10), and a light emitting unit that receives the trigger signal from the control unit (4), emits light, and transmits it to the light receiving unit.

[0045] As shown in FIGS. 1, 3 and 4, the impedance detection unit (40) is connected at one end to the other end of the first heating wire (15) which is connected to the other end of the first resistor (20) and the first switching unit (8), and the other end is grounded, so that when the first switching unit (8) and the second switching unit (9) are turned off, it detects the leakage current (first temperature detection current) flowing through the temperature composite impedance resistance formed between the first heating wire (15), the polyamide thermistor (16), and the second heating wire (17) and outputs it to the control unit (4).

[0046] Additionally, the impedance detection unit (40) may be configured to be connected to the other end of the secondary heating wire (17) as shown in the circuit diagram of one embodiment of FIG. 2, so as to detect leakage current and output it to the control unit (4).

[0047] According to the embodiment, the temperature measuring unit (30) includes an NTC thermistor and is installed adjacent to the heating wire (5) and in parallel with the polyamide thermistor (16) to measure the temperature of the heating wire (5), and outputs a temperature signal (second temperature detection current) corresponding to the measured temperature value to the control unit (4).

[0048] As shown in FIG. 2, the switching unit abnormality detection unit (60) detects the heater current flowing through the heating wire (5) and outputs it to the control unit (4). This is to detect overcurrent caused by abnormalities such as open circuits or short circuits in the first switching unit (8) and the second switching unit (9).

[0049] The control unit (4) receives DC power from the DC power converter (2) and receives an input command from the input / output layer (3) to control the overall operation of the AC propagating heat-sensing temperature control device according to the present invention.

[0050] Specifically, the control unit (4) has a heating wire heating time, a leakage current measurement time (cycle), and a temperature measurement time (cycle) set, and counts one or more of the heating time, leakage current measurement time, and temperature measurement time.

[0051] The control unit (4) turns on the first switching unit (8) and the second switching unit (9) during the heating time to supply a full wave of alternating current to the primary heating wire (15) of the heating wire (5) to heat the heating wire (5), and when the leakage current measurement time arrives, turns off the first switching unit (8) and the second switching unit (9) to stop the heating operation of the heating wire (5), and measures the leakage current through the leakage current measurement unit (40).

[0052] The control unit (4) can detect whether the first switching unit (8) and the second switching unit (9) are short-circuited by measuring the heater current input through the switching unit abnormality detection unit (60) at the above leakage current measurement time.

[0053] Additionally, the control unit (4) may detect whether one or more of the first switching unit (8) and the second switching unit (9) are disconnected by measuring the heater current input through the switching unit abnormality detection unit (60) during the heating time.

[0054] When the first switching unit (8) and the second switching unit (9) are turned on, half of the AC power flows through the first switching unit (8), through the first heating wire (15) and the second heating wire (17), and through the fourth resistor (23) to ground, thereby heating the heating wire (5), and the other half of the power is supplied to the heating wire (5) in the opposite direction, thereby heating the heating wire (5).

[0055] When a leakage current is measured, the control unit (4) determines whether the measured leakage current value exceeds a preset reference value, and if the measured leakage current value exceeds the reference value, it cuts off the AC power supply (not shown) to terminate the operation of the AC electromagnetic heating thermal temperature control device.

[0056] According to another embodiment, if the measured leakage current value exceeds the reference value, the control unit (4) may be configured to display the leakage current value through the input / output layer (3) and issue an alarm, and then continuously measure the leakage current value for a preset time, and if the value continuously exceeds the reference value during the said time, cut off the AC power supply.

[0057] In addition, if it is determined through the switching unit abnormality detection unit (60) that the switching unit (8, 9) is short-circuited, the AC power is cut off to terminate the operation of the AC propagation heating inductive temperature control device.

[0058]

[0059] FIG. 5 is a diagram showing the leakage current detection configuration of an AC full-wave heating thermal temperature control device according to the present invention, FIG. 6 is a diagram showing the temperature measurement configuration of an AC full-wave heating thermal temperature control device according to the present invention, and FIG. 7 is a graph showing the temperature characteristics relative to the impedance characteristics of a polyamide thermistor and an NTC thermistor of a heating wire of an AC full-wave heating thermal temperature control device according to the present invention. The configuration and operation of the leakage current measuring unit (40) and the temperature measuring unit (30) will be explained below with reference to FIG. 5 to 7.

[0060] The leakage current measuring unit (40) is connected in series with the first resistor (20) and measures the leakage current between the first heating wire (15) and the second heating wire (17) by the second resistor (21) and the third resistor (22) which are configured in parallel with the temperature composite impedance resistance formed by the polyamide thermistor (16) configured between the first heating wire (15) and the second heating wire (17) of the heating wire (5) as shown in FIGS. 5 and 6.

[0061] In addition, according to another embodiment, as shown in FIG. 2, it may be configured to be connected in series with the secondary heating wire (17) of the heating wire (5) to detect leakage current (first temperature detection current).

[0062] The temperature measuring unit (30) may be configured to include only an NTC thermistor (31), or, depending on the embodiment, may further include a third switching unit (32) to measure the temperature generated from the heating wire (5) and output a second temperature detection current according to the measured temperature to the control unit (4).

[0063] As described above, the leakage current may be used as a first temperature detection current because it reflects the temperature-combined impedance resistance component of the polyamide thermistor (16).

[0064] However, as shown in Fig. 7, the polyamide thermistor (16) has a curved temperature / impedance characteristic curve and the accuracy of the measured temperature may be reduced.

[0065] In contrast, since the temperature / impedance characteristic curve of the NTC thermistor (31) is linear, the temperature of the heating wire (5) can be measured more accurately through the NTC thermistor (31). Therefore, in the present invention, leakage current between the primary heating wire (15) and the secondary heating wire (17) is detected through the impedance detection unit (40), and the temperature of the heating wire (5) is measured through the temperature measurement unit (30).

[0066] The third switching unit (32) of the temperature measuring unit (30) may be configured as a switch that turns on or off depending on the user's press, or as an electronic switch that turns on or off by receiving a control signal from the control unit (4). The control signal may be generated at regular intervals as a temperature measurement event, or it may be generated when a temperature measurement request is made by input such as a user's button.

[0067]

[0068] FIG. 8 is a flowchart illustrating an alternating current propagating heat thermal temperature control method according to one embodiment of the present invention.

[0069] First, when AC power is supplied by driving the AC power supply unit (1) (S111), the control unit (4) initializes the heating time and leakage current detection time (S113).

[0070] First, the control unit (4) sets the heating mode and counts the heating time and the leakage current detection time (S115), and heats the heating wire (5) by turning on the first switching unit (8) and the second switching unit (9) until the heating time exceeds a certain time or the leakage current detection time exceeds a preset time (S119) (S117).

[0071] When the counted leakage current detection time exceeds a preset time or the heating time exceeds a preset time, the control unit (4) turns off the first switching unit (8) and the second switching unit (9) and detects the leakage current through the impedance detection unit (40) (S123).

[0072] When a leakage current is detected, the control unit (4) determines whether the detected leakage current exceeds a preset reference value, and if it exceeds the reference value, cuts off the AC power supply (S131).

[0073] On the other hand, if the leakage current is below the reference value, the control unit (4) turns on the third switching unit (31) of the temperature measuring unit (30) to drive the temperature measuring unit (30) and measures the temperature of the heating wire (5) through the NTC thermistor (32) (S127).

[0074] When the temperature of the heating wire (5) is measured, the control unit (4) determines whether the detected temperature is above a preset threshold (S129), and if normal, repeats the process after S113, and if the detected temperature is above the threshold, cuts off the AC power to turn off the power (S131).

[0075] Additionally, the control unit (4) may be configured to detect the heater current in the off state of the first switching unit (8) and the second switching unit (9) through the switching unit abnormality detection unit (60) to detect whether the first switching unit (8) and the second switching unit (9) are short-circuited, and to cut off the AC power supply to turn off the power when a short circuit is detected.

[0076] Meanwhile, it will be readily understood by those skilled in the art that the present invention is not limited to the typical preferred embodiments described above, but can be implemented with various improvements, modifications, substitutions, or additions within the scope of the essence of the invention. If such implementation through improvements, modifications, substitutions, or additions falls within the scope of the appended claims below, the technical concept thereof should also be considered to belong to the present invention.

[0077] [Explanation of the symbol]

[0078] 1: AC power supply unit 2: DC power supply unit

[0079] 3: I / O Layer 4: Control Unit

[0080] 5: Heating wire 8: First switching unit

[0081] 9: Second switching unit 10, 11: Triac

[0082] 13: Trigger input section 14: Core

[0083] 15: Primary heating wire 16: Polyamide thermistor

[0084] 17: Secondary heating wire 20: First resistance

[0085] 21: Second resistor 22: Third resistor

[0086] 23: 4th resistor 30: Temperature measuring section

[0087] 31: NTC Thermistor 32: Third Switching Section

[0088] 40: Impedance detection unit 60: Switching unit abnormality detection unit

Claims

1. A heating wire comprising a primary heating wire wound around a core, a polyamide thermistor wrapping the upper portion of the primary heating wire, and a secondary heating wire wound around the upper portion of the polyamide thermistor; A first switching unit, one end of which is connected to one end of an AC power supply unit that supplies AC power and the other end of which is connected to one end of the primary heating wire and is turned on or off according to a trigger signal; A second switching unit, one end of which is connected to the other end of the first heating wire and the other end of which is connected to one end of the second heating wire, and which turns on or off according to the trigger signal; An impedance detection unit configured such that one end is connected to the heating wire and the other end is grounded, and measures and outputs leakage current through a polyamide thermistor of the heating wire when the first switching unit and the second switching unit are turned off; A DC power supply unit that converts the above AC power into DC power; and An AC propagation heating thermal type temperature control device characterized by including a control unit that operates by receiving the above DC power to turn on the above first switching unit and second switching unit to supply AC power to the heating wire to heat the heating wire with respect to the propagation of AC power, and after turning off the above first switching unit and second switching unit at a certain time period, measures the leakage current between the heating wires of the heating wire through the impedance detection unit.

2. In Paragraph 1, An AC electromagnetic heating thermal temperature control device characterized in that one end of the impedance detection unit is connected to one end of the primary heating wire.

3. In Paragraph 1, An AC electromagnetic heating thermal temperature control device characterized in that one end of the impedance detection unit is connected to the other end of the secondary heating wire.

4. In Paragraph 1, The above-mentioned first switching unit is, A triac having a gate terminal, one end of which is connected to one end of an AC power supply unit and the other end of which is connected to one end of the primary heating wire and one end of an impedance detection unit, and which is turned on or off by receiving the trigger signal through the gate terminal; and A thermally oriented alternating current heating device characterized by including a trigger input unit connected to both ends of the triac and the gate terminal, and inputting a trigger signal output from the control unit to the gate terminal.

5. In Paragraph 1, The above second switching unit is, A triac having a gate terminal, one end of which is connected to the other end of a primary heating wire and the other end of which is connected to one end of the secondary heating wire, and which is turned on or off by receiving the trigger signal through the gate terminal; and A thermally oriented alternating current heating device characterized by including a trigger input unit connected to both ends of the triac and the gate terminal, and inputting a trigger signal output from the control unit to the gate terminal.

6. In Paragraph 4 or 5, The above trigger input unit is, An AC electromagnetic wave heating thermal temperature control device characterized by including a photocoupler comprising: a light receiving unit, wherein one end is connected to one end of the triac and the other end is connected to the other end of the triac and a gate terminal to receive light and output a trigger signal according to the received light to the gate terminal of the triac; and a light emitting unit, wherein the light emitting unit receives the trigger signal and transmits it to the light receiving unit.

7. In Paragraph 2, The above impedance detection unit is, A second resistor (21) connected to the other end of a first resistor (20) connected to one end of the AC power supply unit and one end of the primary heating wire; and A thermally oriented alternating current heating device characterized by including a third resistor (22) having one end connected to the other end of the second resistor (21) and the other end grounded, such that the second resistor (21) and the third resistor (22) are equivalently connected in parallel to the polyamide thermistor (16), and the current value for the voltage applied to the third resistor (22) is output to the control unit as a leakage current value leaking through the polyamide thermistor between the two heating wires of the heating wire.

8. In Paragraph 7, An NTC thermistor connected in parallel with the temperature-synthesized impedance resistance, which is the resistance component of the polyamide thermistor (16) connected in parallel with the second resistor (21) and the third resistor (22); and A temperature measuring unit further comprising a third switching unit connected between one end of the temperature composite impedance resistor and one end of the NTC thermistor and turned on or off under the control of the control unit, The above control unit is, An AC electromagnetic heating thermal temperature control device characterized by turning on the third switching unit when a temperature measurement event occurs and measuring the temperature through the NTC thermistor.

9. In Paragraph 2, The above impedance detection unit is, One end of a first resistor (20) connected to one end of the AC power supply unit and the other end of a second resistor (21) connected to one end of the primary heating wire; A third resistor (22) having one end connected to the other end of the second resistor (22) and the other end grounded; and An AC electromagnetic wave heating thermal temperature control device characterized by including an NTC thermistor connected in parallel with the temperature composite impedance resistance between the primary heating wire and the secondary heating wire, which is the resistance component of the polyamide thermistor, and outputting the voltage value of the fifth resistor according to the temperature of the heating wire to the control unit as the temperature value of the heating wire during heating operation.

10. A counting process in which the control unit initializes the leakage current detection time at which power is supplied, and then counts the leakage current detection time; An alternating current propagation heating process in which the first switching unit and the second switching unit are turned on until the leakage current detection time counted by the control unit exceeds a preset time, thereby supplying alternating current to the heating wire and heating the heating wire with respect to the propagation of the alternating current; A heating stop process in which, if the above leakage current detection time exceeds a preset time, the control unit turns off both the first switching unit and the second switching unit to stop heating the heating wire; A leakage current measurement process in which, after the control unit stops the heating, the leakage current between the primary heating wire and the secondary heating wire of the heating wire is measured through an impedance detection unit; and A thermally oriented AC heating method characterized by including a fire prevention process in which the control unit turns off the AC power source and stops operation when the measured leakage current exceeds a preset threshold.

11. In Paragraph 10, A thermal temperature control method for AC propagation heating, characterized in that if the measured leakage current is less than a reference value, the control unit repeats the counting process and the AC propagation heating process after a certain period of time.

12. In Paragraph 10, A temperature measurement process in which, if the leakage current measured by the control unit is less than a reference value, the third switching unit is turned on in the heating stop state to measure the temperature of the heating wire through an NTC thermistor; and A method for controlling the temperature of an AC electromagnetic heating sensory temperature, characterized by further including a second fire prevention process in which the control unit turns off the AC power and terminates the operation when the temperature of the measured heating wire exceeds a preset reference value.

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