JPH1027674A - Plane warmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save energy while maintaining comfortability by allowing a preset range of temperature drop from a set temperature as specified at a preset range of changing speed. SOLUTION: A temperature control means 11 receives a signal for the temperature of a heater line 1 from a temperature detecting line 2 and opens/closes a relay for the signal to correspond to a temperature set by a temperature setting means 8, 37.5 deg.C, e.g. A correction selecting means 9 detects the temperature of the heater line 1 to be stabilized by a temperature stability judging means 10 and then adds correction set by a set temperature shifting means 12 and a set temperature changing means 13 to the set temperature. The set temperature shifting means 12 decreases the set temperature up to 1.6 deg.C in terms of 0.08 deg.C/minute which is critical enough for a person to detect. The set temperature changing means 13 memorizes five types of correlation patterns between a corrected temperature and its duration required to hold a skin temperature constant and selects the optimum pattern corresponding to the set temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric carpet,
The present invention relates to a planar heating device such as an electric blanket and an electric floor heater.

[0002]

2. Description of the Related Art Conventionally, this kind of planar heating device is disclosed in Japanese Patent Laid-Open No.
What was shown in 15785 gazette was common.
The main purpose of this is to distort the temperature of the warming device so that the user feels it at least, to eliminate thermal sensation due to the same temperature lasting for a long time by applying thermal stimulation, and to increase comfort. Things.

FIG. 8 is an operation explanatory diagram showing the control of the temperature of the heater body when the conventional technique is used for an electric carpet. As shown in FIG. 8, the temperature of the warming implement is fluctuated up and down around the set temperature, and the level of the temperature fluctuation at this time is set to be felt by the user. In other words, a state in which the temperature is lowered to a point where the temperature is slightly reduced around the set temperature and a state in which the temperature is raised to the point where the temperature is raised are repeatedly performed. This difference in thermal sensation is a moderate stimulus for the user and leads to comfort.

Further, a temperature fluctuation pattern is set so as to have a 1 / f power spectrum, and is varied along the power fluctuation pattern. Patterns with a 1 / f power spectrum are often seen in natural phenomena, and by adopting this as a pattern for temperature fluctuations, the change in thermal sensation is not monotonous but closer to a natural one for even more comfort. Trying to raise it.

Further, according to this method, as described above, it is possible to provide a period during which the temperature is lowered to such an extent that the user feels a cold sensation. To be able to lower the temperature in the warming equipment,
This means that energy consumption can be saved by that much, and energy saving can be achieved by controlling the temperature to be constant for the period during which the temperature is lowered. Therefore, this method has an advantage that it also contributes to energy saving.

[0006]

However, the conventional planar heater has the following problems.

[0007] The purpose of the prior art is to make the user feel the temperature difference and to obtain comfort due to the temperature stimulus.
Therefore, it is necessary to fluctuate the temperature of the warming implement to such an extent that the user feels the temperature difference without fail. However, in general, in a heating device, a temperature difference, particularly a cold sensation at the time of a temperature decrease, is likely to be uncomfortable. That is, whether the user feels the temperature difference to be uncomfortable or comfortable depends on the sense of the individual, which means that the evaluation may be opposite even at the same temperature. Also, even for the same user, there is a high possibility that the evaluation will differ depending on the physical condition and the like. The method of making the user feel the temperature difference in this way has a great risk in terms of enhancing comfort, and has a problem that it is very difficult to set a temperature difference that absorbs individual differences.

[0008] In addition, there is an advantage that energy can be saved by lowering the temperature of the warming implement. However, because of fluctuations around the set temperature and intermittent temperature reduction, The energy saving rate is not so large as compared with the case where the temperature is controlled to be constant.

Further, as described above, in a heating device, a decrease in temperature is highly likely to cause discomfort, so that the temperature decrease cannot be set large. Therefore, there is a problem that the energy saving rate is suppressed low.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a set temperature shift means for correcting a set temperature to be lowered by a predetermined range of temperature at a change speed within a predetermined range, There is provided a set temperature changing means for correcting so as to change the set temperature in a time series around the set temperature lowered by the temperature shift means.

According to the above invention, after the control temperature is lowered within a range that a human does not feel, correction can be made so that the skin temperature does not change. As a result, the same warm feeling as when operating at the set temperature is obtained, so that a great energy saving effect can be obtained while maintaining comfort.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heater provided on a main body of a warming device, and a temperature detecting means for detecting a temperature of the warming device.
Power control means for controlling energization of the heater; temperature setting means for receiving a set temperature from a user; temperature control means for controlling a power control means by comparing a signal from the temperature detection means with the set temperature; And a set temperature shift unit that corrects the set temperature by a predetermined range of temperature width at a change rate within the predetermined range, and the set temperature is changed in time series around the set temperature lowered by the set temperature shift unit. And a set temperature changing means for correcting.

The set temperature from the temperature setting means is corrected by the set temperature shift means so as to be lowered by a predetermined range of temperature at a change rate within the predetermined range, and further, the set temperature change centered on the corrected set temperature. Means for correcting the set temperature in a time-series manner, further comparing the corrected set temperature with the temperature detected by the temperature detection means by the temperature control means, and controlling the power supply to the heater by the power control means. In addition, since the temperature of the warming implement is controlled, a great energy saving effect can be obtained while maintaining comfort.

The temperature change width of the set temperature shift means and the set temperature change means is more than 0 ° C. and not more than 3 ° C. at the temperature of the heater, and the change rate is more than 0 ° C./min and 0.5 ° C./min. The range is as follows.

The set temperature changing means includes a storage means for storing the set temperature to be corrected and its continuation time as a pattern for suppressing a change in human skin temperature, and a timing means for measuring the continuation time. When the time measurement is completed by the means, the set temperature and the duration stored in the storage means are sequentially read out and corrected so as to increase and decrease the set temperature in time series.

The set temperature changing means sequentially reads out the set temperature and its continuation time stored as a pattern for suppressing the human skin temperature change from the storage means while taking timing with the time measuring means, and sets the set temperature in a time series. Is increased or decreased, so that a great energy saving effect can be obtained while maintaining comfort.

Further, the heater and the temperature detecting means have an integral construction. Further, since the temperature of the heater is detected by the temperature detecting means, stable comfort and energy saving can be realized which are hardly affected by changes in environmental conditions such as a floor surface and a room temperature.

Further, there is provided set temperature switching means for switching the change width and change speed of the set temperature to be corrected by the set temperature shift means and the change pattern of the set temperature by the set temperature change means according to the set temperature set by the temperature setting means. Things.

The changing range and changing speed of the set temperature to be corrected by the set temperature shifting means and the changing pattern of the set temperature by the set temperature changing means are switched by the set temperature switching means according to the set temperature set by the temperature setting means. In addition, optimal comfort and energy saving can be realized according to the set temperature set by the user.

Further, whether the temperature of the warming device is stabilized at the set temperature set by the temperature setting means or not, and whether the set temperature is corrected by the set temperature shift means and the set temperature changing means. A correction selection unit for selecting whether or not the temperature is not stabilized by the correction selection unit until the temperature stability determination unit determines that the temperature is stabilized at the set temperature. When it is determined that the temperature has stabilized, the correction selecting means is switched to permit the temperature change by the set temperature shift means and the set temperature changing means.

Until the temperature stability determining means determines that the temperature has stabilized at the set temperature, the temperature is not corrected by the set temperature shift means and the set temperature changing means by the correction selecting means, and the stability at the set temperature is determined. When the determination is made, the temperature is switched by the correction selecting means so as to permit the temperature change by the set temperature shifting means and the set temperature changing means. Can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a control system diagram of an electric carpet which is a planar heating device according to Embodiment 1 of the present invention. A heater wire 1 serving as a heater and a temperature detection wire 2 serving as a temperature detecting means constitute a temperature-sensitive heater wire 4 with a temperature-sensitive material 3 whose impedance changes depending on temperature. FIG. 2 is a configuration diagram of the temperature-sensitive heater wire 4. The temperature-sensitive wire 2 is covered with a temperature-sensitive material 3 mainly composed of polyamide, and the heater wire 1 is spirally wound around the outside thereof. The outside is covered with vinyl chloride 5. As shown in FIG. 3, the temperature-sensitive heater wire 4 is wired to an electric carpet body 6 which is a warming tool. When the temperature of the electric carpet body 6 changes due to the heat generated by the heater wire 1, the impedance of the temperature-sensitive material 3 changes, and the current flowing from the temperature detection wire 2 to the heater wire 1 changes. This current change is taken out as a temperature signal to perform temperature detection.

In this embodiment, a so-called one-wire system using a temperature-sensitive heater wire is adopted. However, if the system can detect the temperature of the heater, the heater and the temperature detection wire are separately wired. However, the configuration is possible even with a so-called two-wire system. However, when the temperature of the heating element that supplies heat to the user, such as a planar heater, is particularly important for thermal sensation, it is preferable that the temperature of the heating element can be directly controlled as in the one-line system of this embodiment. However, stable control can always be performed irrespective of ambient conditions such as room temperature and floor conditions, and it is extremely advantageous in that the object of the present invention is to constantly exert stability and energy savings irrespective of ambient conditions. Becomes

Reference numeral 7 denotes a microcomputer, and the following means are realized as programs of the microcomputer 7, respectively. The user sets a desired temperature in the temperature setting means 8 using a variable resistor, a push switch, or the like, and inputs the temperature to the correction selecting means 9 as a set temperature. The correction selecting means 9 inputs the set temperature directly to the temperature control means 11 when the temperature stability determining means 10 detects that the temperature of the electric carpet body 6 is not stable,
When the temperature stabilization judging means 10 detects that the temperature of the electric carpet main body 6 is stabilized, the set temperature shift means 12
And the set correction by the set temperature changing means 13 are added to the set temperature and input to the temperature control means 11. The setting signal selected by the correction selection means 9 is input to the temperature control means 11,
The relay 14 serving as power control means is turned on / off by comparing the temperature signal with the temperature signal from the temperature-sensitive heater wire 4. In this embodiment, the relay 14 is used as the power control means.
Needless to say, the configuration can be made even by using a switching element such as a thyristor or a triac.

The operation of each means will be described below based on the program of the microcomputer 7. FIG. 4 is a flowchart showing the operation of the electric carpet which is the planar heating device of the present embodiment, and FIG. 5 is a diagram showing the surface temperature of the electric carpet main body 16 when operating in FIG. In this operation explanation,
The case where the set temperature is set to 37.5 ° C. by the temperature setting means 8 is taken as an example. In FIG. 5, a small rise and fall of the temperature can be seen. This is because the relay 14 is used as the power control means in this embodiment.
Shows a state where is turned ON / OFF.

When the operation of the electric carpet is started (S
1) First, a correction value 1 indicating a correction value of the set temperature shift means 12 and a correction value 2 indicating a correction value of the set temperature changing means 13 are initialized to 0 (S2). Next, as shown in FIG. 4, as phase 1, while the electric carpet main body 6 waits for stabilization at the set temperature (S3), temperature control is performed with the set temperature + the correction value 1 + the correction value 2 (S4). this is,
Temperature stability determination means 10 and temperature control means 11 in FIG.
Is equivalent to In other words, the part that waits for the temperature to stabilize is the temperature stability determination means 10, the set temperature + the correction value 1+
The part that performs temperature control with the correction value 2 corresponds to the temperature control unit 11. At this time, since the correction value 1 and the correction value 2 are 0, the operation is controlled by turning on / off the relay 14 so as to maintain the set temperature of 37.5 ° C. as in phase 1 in FIG. I have. At this time, the determination of the temperature stability is made when 20 minutes have elapsed since the temperature entered a range of ± 0.5 ° C. around 37.5 ° C.

Although the operation of this phase 1 is described only as a model case at the start of use of the electric carpet for the sake of simplicity, it is considered that the phase 1 is started when the temperature of the heater is not stable. Can be That is, when the temperature setting is changed, a plurality of heater wires are provided so that the respective energized states can be switched, so-called area switching is possible. When the energized state is switched, or For example, when a switch capable of turning on / off the function of the present invention is provided and the function of the present invention is turned on by the switch.

In this embodiment, the temperature stability determination means 10
Is determined based on the fact that the temperature of the electric carpet body 6 is within a certain range for a certain period of time, but this is also measured by measuring the time that the relay 14 is ON, If it is within a certain range, it may be determined that it is stable, or simply by experimentally calculating the time when the surface temperature is stabilized in a normal use state, and operating at the set temperature for that time Good.

Next, the process proceeds to phase 2 which is the operation of the set temperature shift means 12. In this example, in phase 2, the temperature is lowered by 0.08 ° C. every minute (S5), and finally lowered from the temperature set by the user 37.5 ° C. to 1.6 ° C. lower (S6, S7). ). That is, FIG.
The end of the temperature shift is determined to have a correction value 1 of -1.6 ° C
It is set when it becomes. As described above, while the correction value 1 is being changed, the temperature control is performed using the value obtained by adding the correction value 1 using the temperature control subroutine corresponding to the temperature control means 11 used in the phase 1. At this time, the temperature of the electric carpet body 6 changes as in phase 2 in FIG.

At this time, the correction value 1 indicating the temperature shift in the set temperature shift means 12 is set so as to decrease at a critical temperature change width and change speed which can be detected by a person. Here, a critical temperature change width and a change rate (hereinafter referred to as Wb value) that can be detected by a person are generally a change in temperature and a change rate of the temperature that does not exceed those values. It is a value that is said to not be noticed. This is supported by the relativity between the discrimination threshold to the stimulus, which is the sensory characteristic of the human body, and the sensation, that is, the rule (Weber's law) that a person cannot perceive a change to a certain size in a thermal stimulus. (Shinsuke Muto "Measurement Psychology" Asakura Shoten, 1982
reference).

In the research on the Wb value as a relationship between room temperature and warm sensation, there are literatures, for example, “Handbook of Basic Numerical Formulas for Ergonomics”, supervised by Masahiko Sato, and values obtained by experiments. A set of room temperature and warm and cold thresholds at room temperature, as perceived by humans in ° C (threshold for temperature rise is 0.001 ° C / sec and threshold for coolness is 0.004 ° C / sec) It consists of a set of data as elements of. As shown in the literature example, Wb
There are a lot of data on room temperature and thermal sensation in value studies. However, there is little data on the Wb value at the time of contact, and there is almost no data on the threshold value at the time of contact with a relatively large area such as an electric carpet.
Therefore, in this embodiment, data is obtained by a large number of subject experiments, and a numerical value obtained by obtaining the temperature change width and the change speed is used.

In the experiment of this embodiment, the temperature of the electric carpet body 6, that is, the temperature set by the user is 25 ° C. to 4 ° C.
At a change temperature of 3 ° C. or less and a change rate of 0.5 ° C./min or less between 6 ° C., data indicating no temperature change was obtained. Therefore, in the present embodiment, the temperature change width in the set temperature shift means 12 is set to change within 3 ° C. and the change rate within 0.5 ° C./min according to the set temperature as described above.

This operation corresponds to the set temperature switching means 15 in FIG. 1. In this embodiment, the set temperature of the electric carpet is divided into five stages of 25 ° C. to 46 ° C. The speed is stored in a read-only memory of the microcomputer 7, and the value is used as a correction value 1 by switching as needed based on the temperature set by the temperature setting means 8. Phase 2 above
In the above description, an example in which the set temperature is 37.5 ° C. is shown, and the change width of the surface temperature is set to 1.6 ° C., and the change rate is set to 0.08 ° C./min.

In the present embodiment, the set temperature is changed by switching the set temperature at fixed time intervals. However, when the power control means employs a switching method such as a relay, the power supply to the heater is turned on. The control temperature is different between the case where the set temperature is switched in a state where the power supply is performed and the state where the power supply to the heater is switched off in a state where the power supply to the heater is OFF. Therefore, when the power control means is set to such a switching method, the set temperature is not switched over with time,
The set temperature may be switched according to the number of times the heater is energized. Any method can be used as long as the method allows the change width and the change speed of the temperature of the warming implement to be kept within a certain range.

In FIG. 4, when the phase 2 for shifting the set temperature by the correction value 1 is completed, the set temperature changing means 13
Shifts to phase 3 corresponding to. In the operation of phase 3, the correction value 2 and its continuation time are paired and stored in the read-only memory of the microcomputer 7 corresponding to the storage means 16 by using the counter 17 corresponding to the timekeeping means. The reading is performed while measuring (S8), and the temperature control is performed while changing the correction value 2 in time series (S9, S10, S11). In the present embodiment, the correction value 2 and its continuation time are set as shown in Table 1 below, and the correction value 2 is sequentially switched from step 1 for each elapsed time. When the duration of step 5 has elapsed, the process returns to step 1 and continues again.

[0036]

[Table 1]

(Table 1) is set based on the following contents. FIG. 6 is a diagram showing the temperature change of the electric carpet body 6 and the skin of the subject when the temperature change is not performed in phase 2 and the thermal sensation at that time by the thermal sensation report value. The skin temperature shows a change in the skin temperature when the skin temperature is controlled to 0 when the phase temperature is controlled at the set temperature. Similarly, the reported value of thermal sensation is + side when the thermal sensation in phase 1 becomes 0 with the thermal sensation being 0, and −
5 plots the subject's declaration every 5 minutes as a side. In phase 1, the temperature was lowered based on the Wb value. At this time, the user does not feel any temperature drop because the temperature change of the electric carpet main body 16 is a gradual change. However, as shown in FIG. 6, when the operation is performed so as to maintain a constant temperature while the temperature is lowered, a phenomenon that the skin temperature on the contact surface decreases is observed. If the constant temperature is maintained while this phenomenon occurs, the user eventually feels a decrease in temperature as indicated by the thermal sensation report value. A person has a warm sensation in the skin that feels warm and a cold sensation that feels cold, and the skin temperature is highly correlated with the human's sense of warmth and cold. Observing skin temperature is
It is a factor for objectively judging a person's sense of heat and cold. Therefore, it is important not to change the skin temperature in order not to change the thermal sensation. This change in skin temperature becomes more remarkable as the change in temperature, in this case, the greater the degree of temperature decrease.

In the conventional example, the rise or fall of the skin temperature when this constant temperature is continued is prevented by changing the temperature within a range where the user feels. On the other hand, in the present invention, a method is employed in which the change in skin temperature is prevented while keeping the change in temperature at a value supported by the Wb value, which is a range that is not felt by the person described in phase 2. That is, a change in skin temperature is prevented so that a person does not feel it. In the setting of Table 1, the skin temperature decrease when the temperature is decreased in the phase 2 is increased in the step 1, and if the temperature is continued as it is, the skin temperature is increased. Therefore, the temperature is decreased again in the step 2 and increased in the step 3. It is a pattern that counteracts changes in human skin temperature. In the phase 3, the width of the temperature drop in the phase 2 can be set larger, so that the energy saving can be further increased.

Further, as described above, the correction value 2 and the duration thereof are values determined as a pattern necessary for keeping the skin temperature constant through subject experiments. This pattern depends on the surface temperature of the electric carpet, ie, the temperature set by the user. This is due to the fact that the responsiveness of the skin temperature change varies depending on the temperature range used and is not constant. Therefore, the pattern for keeping the skin temperature constant varies depending on the set temperature. In this embodiment, five types of patterns can be switched according to the setting scale. The pattern in Table 1 is an optimum pattern when the set temperature is 37.5 ° C. and the phase 2 is shifted by 1.6 ° C. in the configuration of the electric carpet body 6 of this embodiment. In this embodiment, the set temperature is 25 ° C. to 4 ° C.
At 6 ° C., an optimum pattern is obtained, stored in the read-only memory of the microcomputer 7, and switched according to the set temperature. Note that the pattern of this phase 3 varies depending on the configuration of the electric carpet main body 6, for example, the material constituting the main body, the material of the carpet cover, the wattage of the heater, and the like, and the setting changes accordingly. Is not the case. Therefore, it is necessary to change a value that does not cause a change in human skin temperature according to the configuration of each electric carpet body 6.

In Table 1, the correction value 2 is indicated by the temperature of the electric carpet body 6 for simplicity of explanation, but in this embodiment, the heater wire 1 and the temperature detection wire 2 are integrated. Since it has a one-line configuration, the control temperature of the heater wire 1 at the time when the main body temperature is actually stored is stored.

FIG. 7 is a diagram showing a comparison between the temperature of the electric carpet body 6, the temperature of the skin of the subject, and the report value of the subject's thermal sensation at that time in the phases 2 to 3 shown in FIG. Although the skin temperature slightly decreased when the temperature was decreased in phase 2, the temperature increased immediately, and the skin temperature did not decrease while the pattern shown in Table 1 was repeated, and was maintained at a substantially constant temperature. . Of course, this temperature change does not exceed the Wb value including the thermal responsiveness of the electric carpet body 6, so that the user does not feel any temperature drop and there is no change in the thermal sensation report value.

According to the experiment of this embodiment, it was found that at room temperature 22 ° C., 10 out of 10 persons could not sense the decrease in temperature. This is because although the surface temperature of the electric carpet has dropped by 1.5 ° C.,
That is, the same comfort as that at 7.5 ° C. is obtained. This reduction in surface temperature saves energy. The power consumption was 226 Wh when the temperature was decreased and the temperature was changed in the embodiment, and 253 Wh when the surface temperature was constant at 37.5 ° C., so the difference was 27 Wh.
The power amount can be reduced by about 10.7% without compromising comfort.

[0043]

As described above, according to the present invention, after the temperature is corrected by the set temperature shift means so as to decrease the temperature by a predetermined temperature range at a change rate within a predetermined range, the set temperature shift means makes the temperature change. Since the temperature is changed in a time series around the temperature corrected by the set temperature shift means, the temperature can be reduced within the range that cannot be felt by humans, and then corrected so that the skin temperature does not change. Despite the operation, the same warm sensation as when the vehicle is operated at the set temperature without feeling a temperature change can be obtained, and both comfort and energy saving can be achieved. Since the temperature is shifted on average so that the user does not feel it, the energy saving rate can be increased as compared with the method of intermittently lowering the temperature, greatly contributing to energy saving.

Further, by setting the temperature change width of the set temperature shift means and the set temperature change means within the range of 3 ° C. at the temperature of the heater and the rate of change similarly in the range of 0.5 ° C./min, the comfort is improved. The optimal balance between energy saving and energy saving can be set.

Further, the set temperature changing means changes the temperature in a pattern for suppressing a change in the skin temperature of the person, thereby preventing the skin temperature from lowering and making the user feel cool after the temperature is lowered. Therefore, the temperature can be greatly reduced and the comfort and the energy saving can be more effectively obtained. Since the temperature is changed in a pattern that does not change the skin temperature, an increase in the skin temperature can be suppressed, and a low-temperature burn can be prevented.

Further, since the heater and the temperature detecting means are integrally formed, the heater wire temperature can be accurately controlled without being affected by the room temperature or the surrounding environment. In addition, the power consumption rate is hardly affected, and comfort and energy saving can always be optimally obtained.
Since the temperature control is performed by directly detecting the temperature of the heater, the temperature of the heater wire does not increase more than necessary, and high safety can be ensured without low-temperature burns or local temperature increase.

Further, set temperature switching means is provided for switching the width and speed of change of the set temperature to be corrected by the set temperature shift means and the change pattern of the set temperature by the set temperature change means according to the set temperature set by the temperature setting means. Since the optimum pattern can be automatically set according to the set temperature, comfort and energy saving can always be obtained with an optimum balance without impairing the operability.

Further, after the temperature stability determining means determines whether or not the temperature of the heater is stabilized at the set temperature set by the temperature setting means, the temperature is corrected by the set temperature shifting means and the set temperature changing means. Correction is performed based on the set conditions, and comfort and energy saving are always obtained optimally regardless of the usage state of the warming tool.

[Brief description of the drawings]

FIG. 1 is a control system diagram of a planar heating device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a temperature-sensitive heater wire used for the same-surface heating device.

FIG. 3 is an external view of the same surface warming device.

FIG. 4 is an operation flowchart of the same-surface heating device.

FIG. 5 is a view showing the surface temperature of the same surface warming device.

FIG. 6 is a correlation diagram of the body temperature, skin temperature, and thermal sensation report value when the set temperature changing means of the planar heater is not used.

FIG. 7 is a correlation diagram between the body temperature, the skin temperature, and the reported value of hot / cold when the set temperature changing means of the planar heating device is used.

FIG. 8 is a diagram illustrating the operation of a conventional planar heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater wire (heater) 2 Temperature detection wire (temperature detection means) 3 Temperature sensing material 4 Temperature sensing heater wire 6 Electric carpet (heating tool) 7 Microcomputer 8 Temperature setting means 9 Correction selection means 10 Temperature stability determination means 11 Temperature control Means 12 Set temperature shift means 13 Set temperature change means 14 Relay (power control means) 15 Set temperature switching means 16 Storage means 17 Counter (time measuring means)

Claims (6)

[Claims] 1. A heater provided in a heating device main body, a temperature detecting device for detecting a temperature of the heating device, a power control device for controlling power supply to the heater, and a temperature for receiving a set temperature from a user. Setting means, a temperature control means for controlling the power control means by comparing a signal from the temperature detection means and the set temperature, and changing the set temperature by a temperature range of a predetermined range at a change speed within a predetermined range. A planar heating device comprising: a set temperature shift means for correcting the temperature so as to be lowered; and a set temperature changing means for correcting the temperature so as to change the set temperature in a time-series manner around the set temperature lowered by the set temperature shift means. 2. The temperature change width of the set temperature shift means and the set temperature change means is more than 0.degree.
The planar heater according to claim 1, wherein the rate of change is in the range of more than 0C / min to 0.5C / min. 3. The set temperature changing means includes: storage means for storing in advance a set temperature to be corrected and its duration as a pattern for suppressing a change in human skin temperature; and time measuring means for timing the duration. 2. The planar heating device according to claim 1, wherein when the time measurement is completed by the time measurement means, the set temperature and the continuation time stored in the storage means are sequentially read out and corrected so as to increase or decrease the set temperature in a time series. 4. The planar heating device according to claim 1, wherein the heater and the temperature detecting means are integrally formed. 5. A set temperature switching means for switching a change width and a change speed of the set temperature to be corrected by the set temperature shift means and a change pattern of the set temperature by the set temperature changing means according to the set temperature set by the temperature setting means. The planar heating device according to claim 1. 6. A temperature stability determining means for determining whether or not the temperature of the warming tool is stabilized at a set temperature set by a temperature setting means, and whether the set temperature is corrected by a set temperature shift means and a set temperature changing means. A correction selection unit for selecting whether or not the temperature is stable at the set temperature until the temperature stability determination unit determines that the temperature is stabilized at the set temperature. 2. The planar heating device according to claim 1, wherein when it is determined that the temperature is stabilized at the set temperature, the correction selecting unit switches to permit the temperature change by the set temperature shift unit and the set temperature changing unit.