JP2007024329A - Sheet heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet heater capable of providing an early comfort warm feeling even in a state where a heating element has absorbed humidity. <P>SOLUTION: This sheet heater comprises a temperature detecting means 12, a temperature setting means 13, a quick heating control means 16 for controlling the heating element at a temperature higher than a set temperature by a temperature setting means 13 in starting power distribution, a determining means 17 for determining prescribed conditions, and a forcible rising control means 18 for controlling the heating element 11 in a state that a control temperature in starting power distribution is higher than a control temperature of the quick heating control means 16 when the prescribed conditions are satisfied by the determination means 17. As the temperature is controlled to a temperature higher than a quick heating temperature by the quick heating control means 16 to rise the temperature of the heating element 11, the absorbed humidity can be easily eliminated, thus a normal temperature characteristic can be early recovered even with respect to the heating element under a humidity absorbing state, and a comfort warm feeling can be provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Conventionally, a heating element having a one-wire structure in which a heating wire and a temperature detection wire are used as one temperature-sensitive heater wire is often used for this type of planar warming tool. When the one-wire configuration is adopted, it is not necessary to separately wire the heat generation wire and the temperature detection wire, and the temperature can be controlled only by wiring a single temperature-sensitive heater wire.

  Further, since the heat generating portion and the temperature detecting portion are integrated, the temperature of the heat generating wire can be directly detected, so that the temperature rise can be suppressed even when the local heat is maintained, and the safety is high.

  The temperature-sensitive heater wire used in the one-wire configuration has a polymer temperature sensor interposed between the heating line and the temperature detection line, and the current flowing between the lines varies depending on the temperature characteristics of the impedance of the temperature sensor. Therefore, it is a common control method to perform temperature control by taking this out from the temperature detection line.

  Therefore, as shown in FIG. 4, the conventional planar warmer has a heating element 1 that is a one-line temperature-sensitive heater wire disposed in a planar warming tool (not shown), and the temperature of the heating element 1. The temperature detection means 2 to detect, the temperature setting means 3 to set the control temperature of the surface heating device, the detection value (temperature of the heating element 1) detected by the temperature detection means 2 and the temperature setting means 3 are set. And a control means 4 for controlling energization of the heating element 1 from the set temperature.

  Here, the relationship between the detected value of the temperature detection means 2 and the temperature of the heating element 1 is shown in FIG. When the heating element 1 is energized, the detection value of the temperature detection means 2 decreases as the temperature of the heating element 1 rises.

  On the other hand, when the user changes the temperature to be set by the temperature setting means 3 such as VR, and the detected value of the temperature detecting means 2 decreases to a signal level (V1) corresponding to the set temperature set in the temperature setting means 3. In the control means 4, temperature control is performed so that the energization of the heating element 1 is not energized.

In addition, at the start of use of the surface warmer, it is easily considered that the temperature of the surface warmer has decreased to a low temperature depending on the use environment. When the temperature of the heating element 1 starts to be controlled at the set temperature, the temperature rise of the surface warming device is slow, which causes discomfort to the user. As shown in FIG. A method is adopted in which rapid heat control is performed at a temperature higher than the set temperature for a certain time from the start (see, for example, Patent Document 1).
JP-A-6-102944

  However, the conventional configuration has a characteristic that when the temperature sensing element used in the one-wire heater wire absorbs moisture, the impedance decreases, and the current flowing between the heating wire and the temperature detection wire increases. ing.

FIG. 7 shows the relationship between the temperature of the heating element and the detected value of the temperature detecting means when comparing the moisture-absorbing heating element and the dry heating element.

As is apparent from FIG. 7, even if the detected value of the temperature detecting means is the same value, the temperature TA of the heat generating element in the moisture absorption state and the temperature TB of the heat generating element in the dry state are
TA> TB
Thus, the moisture absorption state is detected as a lower temperature than the dry state.

  For this reason, in the case of a heat-absorbing heating element, the temperature control is performed even though the temperature of the heating element is low. Will be given.

  In particular, the above symptoms are likely to appear immediately after purchase or at the beginning of the season because they often absorb moisture.

  In order to solve the above-described conventional problems, the planar warming tool of the present invention is provided with a forced start-up control means for controlling at a temperature higher than the rapid heat control temperature at the start of energization.

  As a result, the temperature is controlled to a high temperature from the beginning of energization, and the temperature of the heating element rises more than before. The temperature characteristic can be recovered and a comfortable warm feeling can be given.

  The planar warming tool of the present invention can give a comfortable warm feeling at an early stage even in a state of moisture absorption.

  1st invention sets the control temperature of the heating element arrange | positioned in the planar warmer main body, the controller, the temperature detection means which detects the temperature of a planar warmer, and the planar warmer The temperature setting means, the rapid heating control means for controlling the heating element at a temperature higher than the temperature set by the temperature setting means at the start of energization, the determination means for determining the predetermined condition, and the determination means satisfy the predetermined condition The forced start-up control means for controlling the heating element at a temperature higher than the control temperature of the rapid heat control means at the start of energization is provided so that the forced start-up is performed only when a predetermined condition is satisfied. Since the temperature of the heating element is raised by controlling the temperature at a temperature higher than the rapid heating temperature by the rapid heating control means, the moisture-absorbing moisture can be easily removed. Even heating elements are positive early A temperature characteristic can be recovered, it is possible to give a pleasant warm sensation.

  The second invention is particularly characterized in that the forced start-up control means of the first invention is forcibly energized to the heating element for a certain time from the start of energization, so that the temperature detection means Even if the relationship between the detected value and the heating element changes, the heating element is energized for a certain period of time, making it easier to remove moisture that has been absorbed, allowing normal temperature characteristics to be restored early and comfortable. Can give a warm feeling.

  The third aspect of the invention is particularly characterized in that the forced start-up control means of the second aspect of the invention is characterized in that the energization is stopped when the temperature detected by the temperature detection means reaches an abnormal temperature. When the detected value of the temperature detecting means changes to an abnormal temperature level during the energization, the energization is stopped, so that the temperature of the heating element can be prevented from rising abnormally.

  According to a fourth invention, in any one of the first to third inventions, the determination means is configured such that the detected temperature of the temperature detection means at the start of energization is lower than a predetermined temperature, and the set temperature of the temperature setting means is equal to or higher than a predetermined level. In this case, the control by the forced start-up control means is performed, so that the user feels that the temperature of the surface heating device is low and the level of the temperature setting means is increased to increase the set temperature. When the temperature is set to, by forcibly raising the temperature, moisture absorption is removed at an early stage and the normal temperature characteristic is restored, so that a more comfortable warm feeling can be obtained.

  The fifth aspect of the invention relates to the determination means of the fourth aspect of the invention, particularly when the detected temperature of the temperature detecting means at the start of energization is equal to or higher than a predetermined temperature or when the set temperature of the temperature setting means is lower than a predetermined level. Because it is controlled by the control means, the forced start-up control is not performed when the temperature of the heating element is high immediately after energization or while the temperature characteristics are normal and the temperature control is correct. Thus, it is possible to prevent the temperature from inadvertently rising.

  According to a sixth invention, in any one of the first to third inventions, the determination means includes an internal temperature detection means for detecting the temperature inside the controller, and the internal temperature detected by the internal temperature means is less than a predetermined temperature. In addition, when the set temperature of the temperature setting means is higher than a predetermined level, control by forced start-up control makes it possible to determine the presence or absence of forced start-up control at the temperature inside the controller that is not affected by the moisture absorption state. Therefore, it is possible to determine the forced startup control with higher accuracy.

  According to a seventh aspect of the invention, in particular, when the temperature detected by the internal temperature detecting means is equal to or higher than a predetermined temperature, or when the set temperature of the temperature setting means is lower than a predetermined level, Since the temperature of the heating element is high immediately after energization, etc., the temperature is inadvertently raised by not performing the temperature control by the forced startup control means. Can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In addition, this invention is not limited by the form of a present Example.

(Embodiment 1)
FIG. 1 is a control block diagram of a planar warmer in the first embodiment of the present invention.

  In FIG. 1, a heating element 1 is a one-wire heater line in which a heating line and a temperature detection line are integrated, and there is a controller 15 connected to the heating element 11, and the temperature detection means 12 is a temperature of the heating element 11. The temperature setting means 13 can be arbitrarily switched to a predetermined set temperature such as a slide volume by the user, and the quick heat control means 16 sets the temperature at the start of energization. The heating element 11 is temperature-controlled at a temperature higher than the set temperature of the means 13, the determination means 17 is a means for determining whether or not a predetermined condition is satisfied, and the forced startup control means 18 is When the determination unit 17 satisfies a predetermined condition, the temperature of the heating element 11 is controlled at a temperature higher than that of the quick heat control unit 16.

  About the planar warming tool comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  In order to quickly reach the set temperature set by the temperature setting means 13 by the user, the sheet heating device generates heat at a temperature higher than the set temperature set by the user at the start of energization in the fast heat control means 16. In general, the body 11 is energized and controlled at a set temperature after a certain time.

However, as described above, at the beginning of the season or at the beginning of the season, the sheet heating device, particularly the heating element 1
Since 1 absorbs moisture, the relationship between the detection value of the temperature detection means 12 and the temperature of the heating element 11 may change, and control may not be performed at the set temperature intended by the user.

  Here, if control is to be performed at the original control temperature, it is necessary to quickly remove moisture and return the relationship between the detected value of the temperature detection means 12 and the temperature of the heating element 11 to a normal state.

  Therefore, as shown in FIG. 2, not only the rapid heating control for advancing the time to reach the set temperature but also the heating element at a temperature higher than the rapid heating temperature by the rapid heating control means 16 by the forced startup control means 18. By performing energization control to 11, the temperature of the heating element 11 can be further increased, and moisture can be easily removed.

  As described above, in the present embodiment, by increasing the temperature of the heating element 11, moisture is removed at an early stage, and the relationship between the detected value of the temperature detecting means 12 and the temperature of the heating element 11 is normalized. Thus, the surface warming tool can be controlled at the set temperature intended by the user, and a comfortable warm feeling can be given.

  Further, if the forced start-up control means 18 forcibly energizes the heating element 11 for a certain time from the start of energization, it depends on the detected value of the temperature detection means 12 and the amount of change in characteristics depending on the degree of moisture absorption. Therefore, the temperature of the heating element 11 can be raised, so that moisture can be removed more reliably.

  Although the method for increasing the temperature at the start of energization has been described here, the same effect can be obtained by extending the time during which control is performed at a temperature higher than the set temperature.

  Further, when the detected value of the temperature detecting means 12 changes to an abnormal temperature level during the forced energization by the forced start-up control means 18, the abnormal temperature rise of the heating element 11 is prevented by stopping the energization. be able to.

  The abnormal temperature level is desirably calculated from the heat-resistant temperature of the heating element 11, the heat-resistant temperature of the surface warmer, or the allowable temperature of the surface temperature.

  Moreover, if forced control by the forced startup control means 18 is always performed, the temperature may rise excessively when the heating element 11 is in a dry state or when the temperature is sufficiently high. Therefore, the determination unit 17 determines whether or not to perform forced startup control.

  The determination means 17 is a case where the set temperature set by the user with the temperature setting means 13 is a predetermined level or higher, for example, the user who wants to increase the temperature intentionally, such as a strong scale, and the heat generation by the temperature detection means 12. When the temperature of the body 11 is lower than the predetermined temperature, forcible control by the forced start-up control means 18 is performed only when the temperature of the heating element 11 is low, for example, less than 30 ° C.

  Further, in other cases, that is, when the set temperature set by the user is lower than a predetermined level, for example, when the scale is low, or when the temperature of the heating element 11 is high immediately after energization, the forced startup control means 18. Only the rapid heat control by the rapid heat control means 16 is performed without performing the control according to.

By making such a determination, when the user feels warm and tries to raise the temperature, the forced start-up control means 18 performs control to remove moisture early and return to the original temperature detection characteristic. On the other hand, when a sufficiently warm sensation is obtained, an unintentional temperature rise can be prevented by performing temperature control as before, and a more comfortable warm sensation can be provided.

  Note that the determination condition of the determination unit 17 is determined in consideration of merchantability, usability, and the like, and is not limited to the numerical values described here.

(Embodiment 2)
FIG. 3 is a control block diagram of the planar warming tool according to the second embodiment of the present invention.

  The internal temperature detection means 19 detects the internal temperature of the controller 15, and the controller 15 is connected to the heating element 11. Therefore, when the heating element 11 is energized, the temperature of the heating element 11 is affected. In response, the temperature inside the controller 15 rises.

  Using this temperature change, the determination means 17 determines that the set temperature set by the user in the temperature setting means 13 is equal to or higher than a predetermined level, and the temperature inside the controller 15 detected by the internal temperature detection means 19 is the predetermined temperature. Only when the temperature is low, for example, when the temperature is lower than 20 ° C., forcible control by the forced startup control means 18 is performed.

  Further, in other cases, that is, when the set temperature set by the user is lower than a predetermined level, for example, when the scale is low, or when the detected temperature of the internal temperature detecting means 19 is high immediately after energization, the forced startup Only the rapid heat control by the rapid heat control means 16 is performed without performing the control by the control means 18.

  By making such a determination, when the user feels warm and tries to increase the temperature, the forced start-up control means 18 performs control to remove moisture early and return to the original temperature detection characteristic. On the other hand, when a sufficiently warm sensation is obtained, an unintentional temperature rise can be prevented by performing temperature control as before, and a more comfortable warm sensation can be provided.

  Note that the determination condition of the determination unit 17 is determined in consideration of merchantability, usability, and the like, and is not limited to the numerical values described here.

  As described above, the planar warming device according to the present invention can recover the characteristic change due to moisture absorption of the one-wire heater wire at an early stage, and thus can be applied to a device using a temperature-sensitive heating element.

The block diagram of the planar warming tool in Embodiment 1 of this invention Comparison of temperature between forced startup control and rapid heat control The block diagram of the planar warming tool in Embodiment 2 of this invention Block diagram of a conventional surface heating device A diagram showing the relationship between the detection value of the temperature detection means and the temperature of the heating element A diagram showing the relationship between the temperature and time of the surface heating device at the start of energization Diagram showing the difference between the dry state and moisture absorption state of the heating element

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Heating body 12 Temperature detection means 13 Temperature setting means 14 Control means 15 Controller 16 Rapid heat control means 17 Judgment means 18 Forced start-up control means 19 Internal temperature detection means

Claims (7)

In the heating element disposed in the surface warmer main body and the controller, the controller includes temperature detection means for detecting the temperature of the surface warmer, temperature setting means for setting the control temperature of the surface warmer, When energization is started, rapid heating control means for controlling the heating element at a temperature higher than the temperature set by the temperature setting means, determination means for determining a predetermined condition, and energization when the predetermined condition is satisfied by the determination means A planar warming tool comprising forced start-up control means for controlling the heating element at a starting control temperature higher than the control temperature of the rapid heat control means. The planar warmer according to claim 1, wherein the forced start-up control means forcibly energizes the heating element for a predetermined time from the start of energization. The planar warmer according to claim 2, wherein the forced start-up control means stops energization when the temperature detected by the temperature detection means reaches an abnormal temperature. The determination means is characterized in that when the detected temperature of the temperature detection means at the start of energization is lower than a predetermined temperature and the set temperature of the temperature setting means is equal to or higher than a predetermined level, the forced startup control means performs control. The planar warming tool of any one of Claims 1-3. The determination means performs control by the rapid heat control means when the detected temperature of the temperature detection means at the start of energization is equal to or higher than a predetermined temperature, or when the set temperature of the temperature setting means is less than a predetermined level. 4. A surface heating device according to 4. The determination means includes an internal temperature detection means for detecting the temperature inside the controller. When the internal temperature detected by the internal temperature means is lower than a predetermined temperature and the set temperature of the temperature setting means is equal to or higher than a predetermined level, the determination means is forcibly set up. It controls by raising control, The planar warming tool of any one of Claims 1-3 characterized by the above-mentioned. 7. The determination unit according to claim 6, wherein when the temperature detected by the internal temperature detection unit is equal to or higher than a predetermined temperature, or when the set temperature of the temperature setting unit is lower than a predetermined level, the quick heat control unit performs control. Planar warmer.