JP5541515B2 - Heating toilet seat device - Google Patents

Description

  Aspects of the present invention generally relate to a heating toilet seat device, and more specifically, to a heating toilet seat device capable of heating a toilet seat provided in a toilet bowl.

  In general, the seat surface of the toilet seat is made of a resin such as PP (polypropylene), so the user may feel cold when sitting on a cold toilet seat when the temperature is low, such as in winter. is there. Therefore, there is a heated toilet seat device that can warm the toilet seat. In such a heated toilet seat device, various proposals have been made to save energy.

  For example, a heating toilet seat in which a main induction coil is disposed along the contour of the toilet seat seating surface, a sub induction coil is disposed in an inner region of the main induction coil, and the main induction coil and the sub induction coil are connected in series. There is an apparatus (Patent Document 1). According to the heating toilet seat device described in Patent Document 1, the auxiliary induction coil is disposed at a required place in the inner region of the main induction coil to strengthen the magnetic flux. Thereby, the heating amount of the heating element can be increased at the required location, and the temperature of the location where the toilet seat surface is difficult to warm can be reliably increased. In addition, the heating toilet seat device described in Patent Document 1 has a function of adjusting the amount of current supplied to the induction coil based on the detected temperature signal of the temperature sensor and stopping power transmission when an abnormal temperature rise is detected. Yes.

  When the toilet seat is rapidly heated by induction heating, the temperature of the toilet seat rises more rapidly than a conventional heated toilet seat such as a resistance heating type. In a conventional heating toilet seat such as a resistance heating type, a temperature detection unit such as a thermistor or a thermal fuse having a constant thermal time constant is provided directly below the seating surface. However, in the case of induction heating type toilet seats as well, if a temperature detector is arranged directly under the seating surface and the energization of the induction heating coil is controlled based on the temperature detected by the temperature detector, thermistor or temperature fuse Since the temperature detection unit such as has a constant thermal time constant, it is difficult to detect the temperature of the toilet seat quickly and accurately. Therefore, when the electronic component of the control unit that controls induction heating fails, the temperature of the seating surface may exceed the comfortable temperature.

JP 2009-291460 A

  The present invention has been made on the basis of recognition of such a problem, and provides a heating toilet seat device that uses the principle of induction heating and that can quickly and accurately detect the temperature of the toilet seat. With the goal.

  According to a first aspect of the present invention, there is provided a toilet seat having an induction heating coil, a conductor that is induction-heated by a magnetic field generated by the induction heating coil, a temperature detection unit that detects temperature, and a detection temperature of the temperature detection unit. A control unit for controlling energization to the induction heating coil based on, the conductor has a portion disposed along the upper surface and the inner peripheral surface of the toilet seat, the induction heating coil, Arranged along the inner peripheral surface of the toilet seat, the curvature at some parts is larger than the curvature at other parts, and the temperature detection unit is arranged at a part where the curvature of the induction heating coil is large This is a heating toilet seat device.

  According to this heating toilet seat device, the temperature detection unit is disposed at a portion where the curvature of the induction heating coil is larger than the curvature of other portions. Therefore, the temperature detection part can detect the temperature of the conductor in the vicinity of the site | part with a large curvature of an induction heating coil. The conductor disposed in the portion where the curvature of the induction heating coil is large reaches the high temperature earlier than the conductor disposed in the other portion.

  Thereby, the control part can detect the temperature of a toilet seat quickly and exactly based on the detection temperature of a temperature detection part. Therefore, the control unit can quickly detect the state in which the seating surface has exceeded the comfortable temperature and quickly control the energization to the induction heating coil 220, thereby preventing the toilet seat 200 from being excessively heated.

  Moreover, 2nd invention is 1st invention. WHEREIN: A part of said inner peripheral surface of the said toilet seat has a curved surface of a larger curvature than the other part of the said inner peripheral surface, The curved surface of the said large curvature and The heating toilet seat device is characterized in that the position of the induction heating coil and the portion having the large curvature are combined.

  According to this heating toilet seat device, the induction heating coil is disposed so that the curved surface having a large curvature on the inner peripheral surface of the toilet seat and the portion having a large curvature of the induction heating coil are aligned. Therefore, the conductor disposed on the curved surface having a large curvature on the inner peripheral surface of the toilet seat and the portion having the large curvature of the induction heating coil reaches a high temperature earlier than the conductor disposed on the other portion. Therefore, the control unit can quickly and accurately detect the temperature of the toilet seat based on the temperature detected by the temperature detection unit. And a control part can detect quickly the state where the seating surface exceeded comfortable temperature.

  According to a third aspect of the present invention, in the first or second aspect, the portion of the induction heating coil having the large curvature is formed at a central portion of a front end portion of the inner peripheral surface of the toilet seat. The heating toilet seat device.

  According to this heating toilet seat device, the portion where the curvature of the induction heating coil is large is formed at the center of the front end of the inner peripheral surface of the toilet seat. This region is a region where the thigh of a person sitting on the toilet seat is not generally in contact. Since the region where the curvature of the induction heating coil is large is formed in that region, the person sitting on the toilet seat is less likely to feel uneven temperature of the toilet seat. Therefore, it is difficult for a person to feel uncomfortable when sitting, and the sitting comfort of the toilet seat can be further improved.

  According to a fourth aspect, in the third aspect, the control unit forcibly stops energization of the induction heating coil when the temperature detected by the temperature detection unit reaches a predetermined temperature. The heating toilet seat device.

  According to this heating toilet seat device, the control unit forcibly stops energization of the induction heating coil when the temperature detected by the temperature detection unit reaches a predetermined temperature. Therefore, the temperature of the toilet seat can be prevented from reaching an abnormally high temperature.

  According to the aspect of the present invention, there is provided a heating toilet seat device that uses the principle of induction heating and can detect the temperature of the toilet seat quickly and accurately.

It is a perspective schematic diagram which illustrates the toilet apparatus provided with the heating toilet seat apparatus concerning embodiment of this invention. It is the cross-sectional schematic diagram which expanded and looked at the internal structure of the toilet seat of this embodiment. It is the plane schematic diagram which looked at the toilet seat of this embodiment from the upper part. It is a plane schematic diagram which illustrates the specific example of the installation form of the induction heating coil of this embodiment, and a temperature detection part. It is a cross-sectional schematic diagram in cut surface AA represented to FIG. It is a cross-sectional schematic diagram which illustrates the other specific example of the installation form of the induction heating coil of this embodiment, and a temperature detection part. It is a plane schematic diagram which illustrates the other specific example of the installation form of the induction heating coil of this embodiment, and a temperature detection part. It is a plane schematic diagram which illustrates the other specific example of the installation form of the induction heating coil of this embodiment, and a temperature detection part.

Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
FIG. 1 is a schematic perspective view illustrating a toilet apparatus including a heated toilet seat apparatus according to an embodiment of the invention.
FIG. 2 is a schematic cross-sectional view of the internal structure of the toilet seat according to this embodiment.
In the heating toilet seat device shown in FIG. 2, the toilet lid 300 is omitted.

  The toilet device shown in FIG. 1 includes a Western-style seat toilet 800 and a heated toilet seat device 100 provided thereon. The heating toilet seat device 100 includes a casing 400, a toilet seat 200, and a toilet lid 300. The toilet seat 200 and the toilet lid 300 are pivotally supported with respect to the casing 400 so as to be freely opened and closed. The toilet lid 300 can cover the toilet seat 200 in the closed state.

  As shown in FIG. 2, the toilet seat 200 includes a casing 210 that forms the outer shape of the toilet seat 200. The casing 210 is formed of an insulating material such as resin. Note that the housing 210 may be formed of a plurality of members or a single member.

  As shown in FIG. 2, an induction heating coil 220 that generates a magnetic field H when a high-frequency current I is applied is provided inside the casing 210 of the toilet seat 200. The induction heating coil 220 is disposed along the inner peripheral surface 203 (see FIG. 1) of the toilet seat 200. The induction heating coil 220 is attached to, for example, the upper surface inside the toilet seat 200 (the inner surface facing the seating surface). Alternatively, the induction heating coil 220 may be supported by a support as illustrated in FIGS. 5 and 6.

  In addition, a conductor 230 that is induction-heated by a magnetic field H generated from the induction heating coil 220 is provided around the casing 210 of the toilet seat 200. More specifically, the conductor 230 generates heat by an eddy current induced by the magnetic field H generated from the induction heating coil 220. The conductor 230 has portions disposed along the upper surface 201 (see FIG. 1) and the inner peripheral surface 203 (see FIG. 1) of the toilet seat 200.

  As the conductor 230, for example, a metal such as a ferromagnetic material such as iron or stainless steel or a paramagnetic material such as aluminum can be used. In order to make it difficult to emit the magnetic field H to the outside of the toilet seat 200, it is more preferable to use a ferromagnetic material such as iron or stainless steel having a large electric resistance for the conductor 230. When the conductor 230 is disposed along the upper surface of the toilet seat 200, the surface material 240 such as painting or coating is attached to the surface of the conductor 230 so that the human body and the conductor 230 are not in direct contact with each other. More preferably, it is applied.

  Inside the toilet seat 200, a temperature detector 250 that detects the temperature of the conductor 230 is provided. In addition, a control unit 410 is provided inside the casing 400. Control unit 410 controls energization to induction heating coil 220 based on the temperature detected by temperature detection unit 250. When the control unit 410 applies a high-frequency current I to the induction heating coil 220, the induction heating coil 220 generates a magnetic field H. When the induction heating coil 220 generates the magnetic field H, the conductor 230 generates heat due to the eddy current induced by the magnetic field H.

  Therefore, the heating toilet seat apparatus 100 according to the present embodiment can rapidly heat the seating surface of the toilet seat 200 by using the principle of induction heating, and can make the seating surface an appropriate temperature earlier. Moreover, since the heating toilet seat apparatus 100 concerning this embodiment can heat the seating surface of the toilet seat 200 rapidly, when the user is not using the toilet seat 200, it is not necessary to keep the toilet seat 200 warm. Therefore, for example, energy saving can be achieved as compared with the case where the seating surface of the toilet seat 200 is heated by resistance heating means such as “seeds heater”, “halogen heater”, and “carbon heater”.

  A functional unit as a sanitary washing device may be provided inside the casing 400. That is, the casing 400 may incorporate a sanitary washing function unit having a water discharge nozzle (not shown) that ejects water toward the “butt” of the user sitting on the toilet seat 200. In the present specification, “water” includes not only cold water but also heated hot water.

  Further, inside the casing 400, a “warm air drying function”, a “deodorizing unit”, an “indoor heating unit”, etc. that blows warm air toward the “buttock” of the user sitting on the toilet seat 200 and the like are dried. Various mechanisms may be provided as appropriate. However, in the present invention, the sanitary washing function unit and other additional function units are not necessarily provided.

FIG. 3 is a schematic plan view of the toilet seat according to the present embodiment as viewed from above.
As described above with reference to FIG. 2, the induction heating coil 220 generates the magnetic field H when the control unit 410 applies the high-frequency current I to the induction heating coil 220. At this time, the direction of the magnetic field H is substantially vertical as seen from the induction heating coil 220 existing at the position where the magnetic field H is generated, as shown in FIGS. Therefore, the magnetic field H is more concentrated as the curvature of the induction heating coil 220 increases. That is, the magnetic flux density of the magnetic field H increases as the curvature of the induction heating coil 220 increases. Thus, in this embodiment, the induction heating coil 220 is disposed such that the curvature at a part of the toilet seat 200 is larger than the curvature at the other part of the toilet seat 200. The curvature of the induction heating coil 220 in the parts A1, A2, and A3 shown in FIG. 3 has a relationship of A1>A2> A3.

  According to this, the magnetic flux density in the part A2 shown in FIG. 3 is larger than the magnetic flux density in the part A3 shown in FIG. Further, the magnetic flux density at the part A1 shown in FIG. 3 is larger than the magnetic flux density at the part A2 shown in FIG. As a result, the temperature of the toilet seat 200 at the site A2 shown in FIG. 3 is higher than the temperature of the toilet seat 200 at the site A3 shown in FIG. Further, the temperature of the toilet seat 200 in the part A1 shown in FIG. 3 is higher than the temperature of the toilet seat 200 in the part A2 shown in FIG.

  Therefore, in the present embodiment, the temperature detection unit 250 is disposed in the portion A1 where the curvature of the induction heating coil 220 is larger than the curvature of other portions. That is, the temperature detection part 250 of this embodiment is arrange | positioned in site | part A1 with the largest curvature of the induction heating coil 220. FIG. Therefore, the temperature detection unit 250 of the present embodiment can detect the temperature of the conductor 230 in the vicinity of the portion A1 where the curvature of the induction heating coil 220 is maximum.

  According to this, the control unit 410 can quickly and accurately detect the temperature of the toilet seat 200 based on the temperature detected by the temperature detection unit 250. And the control part 410 can detect the state where the conductor 230 became abnormally high temperature, and the seating surface exceeded comfortable temperature early. Therefore, when the seating surface exceeds the comfortable temperature, the control unit 410 can quickly control the energization to the induction heating coil 220 and prevent the toilet seat 200 from being excessively heated. More specifically, control unit 410 performs control to forcibly stop energization of induction heating coil 220 when the temperature detected by temperature detection unit 250 reaches a predetermined temperature. As a result, the temperature of the toilet seat 200 can be prevented from reaching an abnormally high temperature.

Next, a specific example of the installation form of the induction heating coil 220 and the temperature detection unit 250 of the present embodiment will be described with reference to the drawings.
FIG. 4 is a schematic plan view illustrating a specific example of the installation form of the induction heating coil and the temperature detection unit of the present embodiment.
FIG. 5 is a schematic cross-sectional view taken along the cutting plane AA shown in FIG.

  A part of the inner peripheral surface 203 of the toilet seat 200 of this specific example has a curved surface 203 a having a larger curvature than other portions of the inner peripheral surface 203. In addition, as described above with reference to FIG. 3, the induction heating coil 220 is disposed such that the curvature at a part of the toilet seat 200 is larger than the curvature at the other part of the toilet seat 200. In this specific example, the toilet seat 200 and the induction heating coil 220 are aligned so that the curved surface 203a having the maximum curvature on the inner peripheral surface 203 of the toilet seat 200 and the portion A1 having the maximum curvature of the induction heating coil 220 are aligned. Are arranged respectively.

  According to this, the conductor 230 disposed on the curved surface 203a having the maximum curvature at the portion A1 having the maximum curvature of the induction heating coil 220, that is, the inner peripheral surface 203 of the toilet seat 200, reaches the high temperature earlier. Further, as shown in FIG. 5, the temperature detection unit 250 of this specific example is a portion A <b> 1 where the curvature of the induction heating coil 220 is the maximum, and is provided in the upper part of the toilet seat 200. Therefore, the temperature detector 250 can quickly and accurately detect the temperature of the conductor 230 on the upper surface of the part that reaches the high temperature earlier. And the temperature detection part 250 can detect the state where the seating surface exceeded comfortable temperature earlier.

  In this specific example, the curved surface 203a having the maximum curvature on the inner peripheral surface 203 of the toilet seat 200 is formed at the center of the front end portion of the inner peripheral surface 203 of the toilet seat 200 as shown in FIG. Yes. That is, the portion A1 having the maximum curvature of the induction heating coil 220 is formed at the center of the front end portion of the inner peripheral surface 203 of the toilet seat 200.

  According to this, the center part of the front end portion on the inner peripheral surface 203 of the toilet seat 200 is a region where the thigh of a person seated on the toilet seat 200 is not generally in contact. Since the region A1 having the maximum curvature of the induction heating coil 220 is formed in that region, the person sitting on the toilet seat 200 is less likely to feel uneven temperature of the toilet seat 200. Therefore, a person is unlikely to feel uncomfortable when sitting on the toilet seat 200.

  As shown in FIG. 5, the temperature detection unit 250 of this specific example includes a thermistor 251 that detects the temperature of the conductor 230, and a heat transfer grease that holds the thermistor 251 and transfers the heat of the conductor 230 to the thermistor 251. 253 and a waterproof cover 255 that prevents water from entering the thermistor 251 and the heat transfer grease 253.

  The reaction rate of the thermistor 251 is preferably faster. That is, the heat capacity of the thermistor 251 is preferably smaller. Therefore, the size of the thermistor 251 is preferably smaller, and the influence of the sealing case of the thermistor 251 is preferably smaller.

  Further, the installation position of the thermistor 251 is preferably closer to the conductor 230. More specifically, the thermistor 251 is preferably in contact with the conductor 230. Alternatively, even if the thermistor 251 is not in contact with the conductor 230, it is preferable that the thermal conductivity of the heat transfer grease 253 is larger.

  The thermistor 251 preferably has a waterproof structure. Alternatively, the thermistor 251 needs not to be damaged by the stress generated when the user is seated. Alternatively, the thermistor 251 needs not to be peeled off from the casing 210 due to the stress generated when the user is seated.

  As the temperature detection unit 250, a temperature fuse or a bimetal can be used instead of the thermistor 251. In this case, when the temperature fuse or bimetal detects an abnormal temperature, the control unit 410 that controls the amount of power supplied to the induction heating coil 220 is not used, but the control unit 410 that can cut off the power supply to the induction heating coil 220 is used. The energization of the induction heating coil 220 can be forcibly cut off.

FIG. 6 is a schematic cross-sectional view illustrating another specific example of the installation form of the induction heating coil and the temperature detection unit of this embodiment.
FIG. 6 corresponds to a schematic cross-sectional view taken along the cutting plane AA shown in FIG.

  Compared to the specific example described above with reference to FIG. 5, the induction heating coil 220 of this specific example extends to the vicinity of the inner peripheral surface 203 of the toilet seat 200. And the temperature detection part 250 is the site | part A1 with the largest curvature of the induction heating coil 220, Comprising: It is provided in the inner peripheral part of the toilet seat 200. FIG. That is, the temperature detection unit 250 is provided on the curved surface 203 a having the maximum curvature on the inner peripheral surface 203 of the toilet seat 200. Other structures are the same as the structures of the specific examples described above with reference to FIGS.

  According to this specific example, the temperature detector 250 can quickly and accurately detect the temperature of the conductor 230 on the inner peripheral surface of the portion that reaches the high temperature earlier. And the temperature detection part 250 can detect the state where the seating surface exceeded comfortable temperature earlier. As for other effects, the same effects as those described above with reference to FIGS. 4 and 5 can be obtained.

FIG. 7 is a schematic plan view illustrating still another specific example of the installation form of the induction heating coil and the temperature detection unit of the present embodiment.
In this specific example, the induction heating coil 220 is arranged so that the position of the portion A4 having the maximum curvature of the induction heating coil 220 and the curved surface 203a having the maximum curvature on the inner peripheral surface 203 of the toilet seat 200 are aligned. Absent. In this specific example, the portion A4 having the maximum curvature of the induction heating coil 220 is formed in the vicinity of the portion where the toilet seat 200 is pivotally supported with respect to the casing 400, as shown in FIG.

  Further, the electric conductor 230a of this specific example extends to the vicinity of the portion where the toilet seat 200 is pivotally supported with respect to the casing 400, as compared with the electric conductor 230 of the specific example described above with reference to FIG. The temperature detector 250 is a portion A4 where the curvature of the induction heating coil 220 is the maximum, and is provided on the upper part of the toilet seat 200. Other structures are the same as the structures of the specific examples described above with reference to FIGS.

  According to this specific example, the conductor 230a disposed in the vicinity of the portion A4 where the curvature of the induction heating coil 220 has the maximum curvature, that is, the portion where the toilet seat 200 is pivotally supported with respect to the casing 400 reaches the high temperature more quickly. To do. Therefore, the temperature detector 250 can quickly and accurately detect the temperature of the conductor 230 on the upper surface of the part that reaches the high temperature earlier. And the temperature detection part 250 can detect the state where the seating surface exceeded comfortable temperature earlier.

  In addition, the portion A4 having the maximum curvature of the induction heating coil 220 is a region where the buttocks and thighs of the person sitting on the toilet seat 200 are not in general contact. Since the region A4 having the maximum curvature of the induction heating coil 220 is formed in that region, the person sitting on the toilet seat 200 is less likely to feel uneven temperature of the toilet seat 200. Therefore, a person is unlikely to feel uncomfortable when sitting on the toilet seat 200.

FIG. 8 is a schematic plan view illustrating still another specific example of the installation form of the induction heating coil and the temperature detection unit of the present embodiment.
In the present specific example, similarly to the specific example described above with reference to FIG. 7, the portion A5 having the maximum curvature of the induction heating coil 220 is formed in the vicinity of the portion where the toilet seat 200 is pivotally supported with respect to the casing 400. In the portion A5 where the curvature of the induction heating coil 220 is the maximum, as shown in FIG. 8, the induction heating coil 220 is formed on an extension line of one induction heating coil 220, and is formed in a so-called “spiral shape”. . Other structures are the same as those of the specific example described above with reference to FIG.

  According to this specific example, the conductor 230a disposed in the portion A5 where the curvature of the induction heating coil 220 has the maximum curvature, that is, the portion where the induction heating coil 220 is formed in a “spiral shape”, reaches the high temperature earlier. . Therefore, the temperature detector 250 can quickly and accurately detect the temperature of the conductor 230 on the upper surface of the part that reaches the high temperature earlier. And the temperature detection part 250 can detect the state where the seating surface exceeded comfortable temperature earlier.

  Further, since the portion A5 having the maximum curvature of the induction heating coil 220 is formed in the vicinity of the portion where the toilet seat 200 is pivotally supported with respect to the casing 400, similarly to the effect in the specific example described above with reference to FIG. A person is unlikely to feel uncomfortable when sitting on the toilet seat 200.

  As described above, according to the present embodiment, the temperature detection unit 250 is disposed in the portions A1, A4, and A5 where the curvature of the induction heating coil 220 is larger than the curvature of other portions. That is, the temperature detection part 250 of this embodiment is arrange | positioned in site | part A1, A4, A5 in which the curvature of the induction heating coil 220 is the largest. Therefore, the temperature detection unit 250 of the present embodiment can detect the temperature of the conductor 230 in the vicinity of the portions A1, A4, and A5 where the curvature of the induction heating coil 220 is maximum.

  Accordingly, the control unit 410 can quickly and accurately detect the temperature of the toilet seat 200 based on the temperature detected by the temperature detection unit 250. And the control part 410 can detect the state where the conductor 230 became abnormally high temperature, and the seating surface exceeded comfortable temperature early. Therefore, the control unit 410 can quickly control the energization of the induction heating coil 220 when the conductor 230 reaches an abnormally high temperature, and can prevent the toilet seat 200 from being excessively heated.

The embodiment of the present invention has been described above. However, the present invention is not limited to these descriptions. As long as the features of the present invention are provided, those skilled in the art appropriately modified the design of the above-described embodiments are also included in the scope of the present invention. For example, the shape, size, material, arrangement, etc. of each element included in the toilet seat 200 and the like, the installation form of the induction heating coil 220, and the like are not limited to those illustrated, and can be changed as appropriate.
Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

  DESCRIPTION OF SYMBOLS 100 Heating toilet seat apparatus, 200 Toilet seat, 201 Upper surface, 203 Inner peripheral surface, 203a Curved surface, 210 Housing | casing, 220 Induction heating coil, 230 Conductor, 230a Conductor, 240 Surface material, 250 Temperature detection part, 251 Thermistor, 253 Transmission Thermal grease, 255 waterproof cover, 300 toilet lid, 400 casing, 410 control unit, 800 Western style toilet

Claims (4)

A toilet seat having an induction heating coil, a conductor that is induction-heated by a magnetic field generated by the induction heating coil, and a temperature detection unit that detects temperature;
A control unit for controlling energization to the induction heating coil based on the temperature detected by the temperature detection unit;
With
The conductor has a portion disposed along an upper surface and an inner peripheral surface of the toilet seat;
The induction heating coil is disposed along the inner peripheral surface of the toilet seat, and the curvature in some parts is larger than the curvature in other parts,
The heating toilet seat device according to claim 1, wherein the temperature detection unit is disposed at a portion where the curvature of the induction heating coil is large. A part of the inner peripheral surface of the toilet seat has a curved surface with a larger curvature than the other part of the inner peripheral surface,
The heating toilet seat device according to claim 1, wherein the curved surface having the large curvature is aligned with the portion of the induction heating coil where the curvature is large.   The heating toilet seat device according to claim 1 or 2, wherein the portion of the induction heating coil having the large curvature is formed at a center portion of a front end portion of the inner peripheral surface of the toilet seat.   The heating toilet seat device according to claim 3, wherein when the temperature detected by the temperature detection unit reaches a predetermined temperature, the control unit forcibly stops energization of the induction heating coil.

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