JPH0875182A - Temperature controller for electric carpet - Google Patents

Abstract

PURPOSE: To provide a temperature controller for an electric carpet which is scarcely affected by the influence of a room temperature and a floor temperature. CONSTITUTION: The temperature change of a heat generator 10 is detected as the variation of a resistance value by a temperature sensing element 5, voltage-divided from a resistor 51, and half-wave rectified by a diode 53 and a capacitor 54, and input as a voltage Va to a controller 30. When the voltage Va is lower than a predetermined reference voltage Vb, a drive signal Sd is sent to a transistor 13, a relay solenoid 12 is driven to close a relay contact 11, and a heat generator 10 is energized. The above-described voltage Vb is switched according to the type of a floor material used by a switch 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for an electric carpet for controlling a current supplied to a heating element of the electric carpet to keep the temperature constant.

[0002]

2. Description of the Related Art In recent years, air-conditioning equipment has been remarkably spread in search of a comfortable living environment. Among them, simple and easy electric carpets, which do not require facility construction, are becoming popular. In such temperature control of an electric carpet, it is general to provide a temperature sensitive element in the vicinity of the heating element embedded in the carpet and keep the temperature of the heating element constant.

FIG. 7 is a block diagram of such a conventional temperature control device for an electric carpet. In the figure, 100 is an AC power source, 10 is a heating element, and 5 is a heat sensitive element, and these constitute the main body 1. 51 is a resistor, 53
Is a diode, 54 is a capacitor, 11 is a relay contact, 12 is a relay solenoid, and 13 is a transistor. Reference numeral 20 is a control circuit. The operation of the conventional electric carpet temperature control device configured as described above will be described below.

Now, as shown by the one-dot chain line in FIG. 6, the heat-sensitive body 5 composed of the thermistor is the heat-generating body 10 shown by the dotted line.
Being close to. The temperature of the heating element 10 is
Is detected by Control circuit 20 and resistor 5 shown in FIG.
1, diode 53, capacitor 54, relay contact 11, relay solenoid 12, transistor 13,
It is built in the control box 2.

The temperature of the heating element 10 is detected by the heating element 5, converted into a voltage signal Va, and input to the control circuit 20. The voltage signal Va is divided by the resistance value R of the heat sensitive body 5 and the resistance value Ra of the resistor 51, and half-wave rectified by the diode 53 and the capacitor 54 to generate the voltage signal Va. The voltage Va at this time is given by Va = Ra / (Ra + R) · V (1). Here, V is a voltage when the AC power supply 100 is half-wave rectified.

This voltage signal Va is compared with a reference voltage Vb preset in a control circuit (for example, a microcomputer). Based on this comparison result, Va <Vb
Then, the drive signal Sd is sent to the transistor 13,
The transistor 13 is turned on. At this time, the relay solenoid 12 is energized, the relay contact 11 is closed, and the heating element 10 is energized. As a result, the temperature of the main body 1 rises.

On the other hand, when the temperature of the heating element 10 rises due to heat generation, the temperature of the heat sensitive body 5 also rises accordingly. The temperature-resistance characteristics of the heat sensitive body 5 (thermistor) are
As shown in FIG. 8, the resistance value R decreases as the temperature rises. Thus, from the relationship of equation (1),
The value of the voltage signal Va increases and eventually exceeds the reference voltage Vb.

At this time, the control circuit 20 controls the drive signal Sd.
Then, the transistor 13 is turned off to cut off the energization of the relay solenoid 12, and the relay contact 11 is opened to stop the energization of the heating element 10.

As a result, as the temperature of the main body 1 decreases, the temperature of the heat sensitive body 5 also decreases, and the resistance value R of the heat sensitive body 5 increases from the relationship of FIG. 8, and the voltage signal Va according to the relationship of equation (1). Will fall. As a result, when the voltage signal Va becomes smaller than the reference voltage Vb, the control circuit 20 turns on the transistor 13 and energizes the heating element 10 again as described above. By repeating such a series of operations, the control circuit 20
Is to maintain the main body 1 at a constant temperature.

[0010]

However, in such a conventional temperature control device for an electric carpet, since the heat sensitive body 5 is arranged in the vicinity of the heat generating body 10, there is almost no change in room temperature or floor temperature. The main body 1 is energized independently. Therefore, only the heating element 10 is kept at a constant temperature,
As shown in FIG. 6, the temperature propagation from the heating element 10 to the region where the temperature sensing element 5 is not arranged is not uniformly performed in the actual use state in which the floor material on which the main body 1 is placed is different. However, there is a problem that the temperature of the entire main body 1 cannot be kept constant.

Further, even if a temperature sensing device for detecting only room temperature is newly provided inside the temperature control device to control the temperature, as in JP-A-5-33956, the temperature will be affected by the floor temperature. It is difficult to keep the temperature of the entire main body 1 constant.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a temperature control device for an electric carpet, which is less susceptible to room temperature and floor temperature.

[0013]

In order to achieve the above object, the temperature control device for an electric carpet according to the present invention has, in the structure of claim 1, heat generated by energization, which is arranged flat on the electric carpet. An electric carpet temperature control device for controlling a body temperature to a predetermined set temperature, comprising a setting means for varying the set temperature according to a floor material on which the main body is placed.

Further, in the structure of claim 2, the setting means includes a selection means for selecting the degree of change of the set temperature.

Further, in the structure of claim 3, the setting means is a temperature-sensing means which is provided in a region of the main body where the heating element is not arranged and which detects a temperature of a floor surface on which the main body is placed. It is characterized by including.

Further, in the structure of claim 4, the setting means is provided in a region of the main body where the heating element is not arranged, and detects a temperature of a floor surface on which the main body is placed. It includes a warming means and a second temperature sensitive means for detecting the room temperature.

[0017]

With the above construction, according to the construction of claim 1, by providing the setting means for varying the set temperature according to the material of the floor surface, the main body under the influence of the floor material in the room being used is The change in temperature will be reduced.

Further, according to the second aspect of the invention, the set temperature can be arbitrarily selected according to the floor material used by the user.

According to the third aspect of the invention, the temperature sensing means is provided in the area where the heating element is not arranged.
The bed temperature will be directly detected.

According to the structure of claim 4, claim 3
In addition to the above configuration, by further providing the second temperature sensing means for detecting the room temperature, both the room temperature and the floor temperature are detected and the set temperature is controlled.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram of a temperature control device for an electric carpet according to a first embodiment of the present invention.
In the figure, the AC power supply 100, the heating element 10, the heat sensitive element 5, the resistor 51, the diode 53, the capacitor 54, the relay contact 11, the relay solenoid 12, and the transistor 13 are the same as those in the conventional example, and detailed description thereof is omitted. To do. Reference numeral 30 is a control circuit, and 40 is a switch for switching the set temperature according to the floor material.

The operation of the temperature control device for an electric carpet of the present invention constructed as above will be described below. As shown in FIG. 6, the electric carpet is provided with a control box 2 for controlling energization of the heating element 10 shown by a dotted line at the end of the carpet body 1. The control circuit 30 is built in the control box 2 as in the conventional example, and the switch 40 is attached to the end of the control box 2.

By the way, the heat insulating property is different depending on the material of the floor material in which the electric carpet is actually used, for example, flooring or carpet made of tatami or wood. For this reason, for example, the carpet has the property that the temperature rises most easily, the tatami has the second highest temperature, and the flooring has the lowest temperature rise. A feature of this embodiment is that the switch 40 allows the user to select a different floor material as shown in the figure in order to reliably set the temperature according to the difference.

That is, the reference voltage Vb proportional to the set temperature corresponding to the position of the selected switch 40 is prepared in advance. For the above-mentioned reason, the value of this reference voltage is Vb for the reference voltage of the carpet, tatami, and flooring, respectively.
If Vb1, Vb2 and Vb3 are satisfied, then Vb1 <Vb2 <Vb3.

As a result, the temperature of the heating element 10 controlled by the control circuit 30, that is, the set temperature is
Tatami, flooring set temperature T1, T2, T respectively
3, the peripheral circuit of the control circuit 30 and its operation are the same as those of the conventional example, so that T1 <T2 <T3.

As described above, according to the present embodiment, by providing the switch 40 for allowing the user to select the type of floor material, it is possible to obtain the set temperature according to the floor material.

FIG. 2 is a block diagram of a temperature control device for an electric carpet according to the second embodiment of the present invention. In the figure, AC power supply 100, heating element 10, heat sensitive element 5, resistor 51, diode 53, capacitor 5
4, the relay contact 11, the relay solenoid 12, and the transistor 13 are the same as those in the conventional example,
Detailed explanation is omitted. Incidentally, 31 is a control circuit, 41 is a temperature sensitive element, and 42 is a resistor.

The operation of the temperature control device for an electric carpet of the present invention constructed as above will be described below. The control circuit 31, the temperature sensitive element 41 and the resistor 42 are shown in FIG.
The temperature-sensitive element 41 is built in the control box 2 and is provided at a position in contact with the floor surface.

A constant voltage V0 is supplied to one end of the temperature sensing element 41 from the control circuit 31, and a voltage Vc obtained by dividing the voltage V0 by the resistor 42 and the temperature sensing element 41 is the control circuit 31.
Has been entered. This voltage Vc is given by Vc = Rb / (Rb + R ') V0 (2) Where Rb is the resistance value of the resistor 42,
R ′ is the resistance value of the temperature sensitive element 41.

The temperature-resistance characteristic of the temperature sensitive element 41 (which is a thermistor) is as shown in FIG. 8 similarly to the temperature sensing element 5, so that the resistance value R'decreases as the temperature increases. . As a result, according to the relationship of the equation (2), the voltage Vc becomes low when the floor temperature is low, and conversely the voltage Vc becomes high when the floor temperature is high.

When the voltage Vc is low, that is, when the floor temperature is low, the reference voltage Vb held inside the control circuit 31 is increased to control the energization of the heating element 10 so as to increase the set temperature of the main body 1. On the contrary, when the voltage Vc is high, that is, when the temperature of the floor is high, the reference voltage Vb is lowered to control the energization of the heating element 10 so as to lower the set temperature of the main body 1. This makes it possible to obtain a set temperature according to the temperature of the floor surface.

Although the temperature sensitive element 41 is mounted inside the control box 2 in this embodiment, as shown in FIGS. 3 (a) and 3 (b), the heating element 10 on the outer peripheral portion of the main body 1 is used. May be provided in a region where no is arranged, or as shown in FIGS. 4A and 4B, the back surface of the main body 1 may be provided so as to be in direct contact with the floor surface.

Further, as a method of changing the reference voltage Vb by the voltage Vc, a plurality of comparators may be built in the control circuit 31 or multi-value control may be performed by analog-digital conversion.

As described above, according to this embodiment, in order to detect the temperature of the floor surface by the temperature sensitive element 41 and control the temperature of the heating element, as in the first embodiment, the user selects the floor material. Since it is not necessary to switch the set temperature accordingly, there is an effect that the usability is improved and more precise temperature control is possible.

FIG. 5 is a block diagram of a temperature control device for an electric carpet according to the third embodiment of the present invention. In the figure, AC power supply 100, heating element 10, heat sensitive element 5, resistor 51, diode 53, capacitor 5
4, the relay contact 11, the relay solenoid 12, the transistor 13, the temperature sensitive element 41, and the resistor 42 are the same as those in the second embodiment, and detailed description thereof will be omitted. In addition, 32 is a control circuit, 43 is a temperature sensitive element, and 44 is a resistor.

The operation of the temperature control device for an electric carpet of the present invention constructed as above will be described below. The control circuit 32, the temperature sensitive element 43, and the resistor 44 are shown in FIG.
It is assumed that the control box 2 is built in.

The temperature sensitive element 43 is provided so as to detect a change in room temperature, and a constant voltage V0 is supplied from the control circuit 32 to one end of the temperature sensitive element 43.
The voltage Vd obtained by dividing the voltage by the resistor 44 and the temperature sensitive element 43 is input to the control circuit 32. This voltage Vd is given by Vd = Rc / (Rc + R ″) · V0 (3), where Rc is the resistance value of the resistor 43,
R ″ is the resistance value of the temperature sensitive element 41.

The temperature-resistance characteristic of the temperature sensitive element 43 (which is a thermistor) is as shown in FIG. 8 similarly to the temperature sensitive element 41, so that the resistance value R ″ decreases as the temperature increases. As a result, from the relationship of the equation (3), the voltage Vd becomes low when the room temperature is low, and conversely, the voltage Vd becomes high when the room temperature is high.

When the voltage Vd is low, that is, when the room temperature is low, the reference voltage Vb held inside the control circuit 32 is raised to control the energization of the heating element 10 so as to raise the set temperature of the main body 1. On the contrary, when the voltage Vd is high, that is, when the room temperature is high, the reference voltage Vb is lowered to control the energization of the heating element 10 so as to lower the set temperature of the main body 1. This allows
A set temperature according to room temperature can be obtained.

As described above, the temperature of the floor is detected by the temperature sensitive element 41 in the same manner as in the second embodiment, and the detection result of the temperature of the floor and the detection result of the above room temperature are combined. It is possible to control the energization of the heating element 10.

As described above, according to the present embodiment, the temperature of the floor surface and the room temperature are detected to control the energization of the heating element, so that the accuracy of temperature control is further improved as compared with the second embodiment. The effect of improvement is obtained.

[0042]

As described above, according to the temperature control device for an electric carpet of the present invention, according to the structure of claim 1, the setting means for changing the set temperature according to the material of the floor surface is provided. There is an effect that the temperature of the carpet main body can be maintained properly and constant regardless of the material of the surface, and fine temperature control can be performed.

According to the second aspect of the present invention, the setting means is the selection means for selecting the degree of variability of the set temperature, so that the user can obtain the set temperature according to the floor material. The effect that can be obtained can be obtained.

According to the third aspect of the invention, the temperature sensing means is provided in the area where the heating element is not arranged.
Since the floor temperature is directly detected, it is not necessary for the user to switch the set temperature according to the floor material as in the configuration of claim 2, so that the usability is improved and more detailed temperature control is possible. There is a further effect of becoming.

According to the structure of claim 4, claim 3
In addition to the configuration described above, by providing a second temperature sensing means for detecting room temperature, both the room temperature and the floor temperature are detected to control the set temperature. The effect that the control accuracy is improved is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a temperature control device for an electric carpet according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a temperature control device for an electric carpet according to a second embodiment of the present invention.

FIG. 3 is a diagram showing an example of a mounting position of a temperature sensitive element in the same embodiment.

FIG. 4 is a diagram showing another example of the mounting position of the temperature sensitive element in the embodiment.

FIG. 5 is a block diagram of a temperature control device for an electric carpet according to a third embodiment of the present invention.

FIG. 6 is an overall view of an electric carpet according to the present invention.

FIG. 7 is a block diagram of a temperature control device for an electric carpet in a conventional example of the present invention.

FIG. 8 is a characteristic diagram of a temperature sensitive element used in the present invention.

[Explanation of symbols]

 1 Main Body 5 Temperature Sensitive Body 10 Heating Element 11 Relay Contact 12 Relay Solenoid 13 Transistor 51 Resistor 53 Diode 54 Capacitor 30 Control Circuit 40 Switch

Claims (4)

[Claims] 1. A temperature control device for an electric carpet for controlling a temperature of a heating element, which is arranged in a plane on the electric carpet and generates heat by energization, to a predetermined set temperature, wherein the main body is installed. A temperature control device for an electric carpet, comprising a setting means for varying the set temperature according to the floor material to be covered. 2. The temperature control device for an electric carpet according to claim 1, wherein the setting means includes a selection means for selecting a degree of variability of the set temperature. 3. The setting means is provided in a region of the main body where the heating element is not arranged, and includes a temperature sensing means for detecting a temperature of a floor surface on which the main body is placed. Item 2. A temperature control device for an electric carpet according to Item 1. 4. The first setting means is provided in a region of the main body where the heating element is not arranged, and detects a temperature of a floor surface on which the main body is placed.
2. The temperature control device for an electric carpet according to claim 1, further comprising: a temperature-sensing unit according to claim 1;