JP3162810B2 - Area electric heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar electric heater for controlling the amount of heat generated by detecting a room temperature.

[0002]

2. Description of the Related Art For example, a planar electric heater such as an electric carpet is provided with a room temperature detecting means, as disclosed in Japanese Patent Application Laid-Open No. 2-270282, to determine the amount of power after the heater is energized, so-called room temperature correction. To do. This is because when the room temperature (outside temperature) is low at the beginning of energization, the amount of power is increased to raise the body temperature of the carpet to the set temperature in a short time, and conversely, when the room temperature is low, the amount of power is reduced. It slowly reaches the set temperature. The above-described detection of the room temperature is performed by detecting the temperature in the controller by a room temperature sensor in the controller provided at the corner of the carpet body.

[0003]

However, since the room temperature sensor uses one sensor and is provided in the controller, the heat of the heater is transmitted to the controller when the heater is energized, and the temperature in the controller is reduced. Since the temperature rises, the sensor determines that the room temperature is high, and there is a disadvantage that the amount of heat generated by the heater after the start of energization is insufficient despite the fact that the room temperature is low.

The present invention is to control the electric power of a heater wire by detecting the temperature at a substantially accurate room temperature.

[0005]

SUMMARY OF THE INVENTION One aspect of the present invention is a planar heater provided with a heater wire, a controller provided at a periphery of the planar heater to control the temperature of the heater, and A first temperature sensor provided in the controller for detecting a temperature inside the controller, a second temperature sensor provided at a position in the controller exposed to outside air to detect an ambient temperature, the first temperature sensor and the second temperature sensor From the first temperature sensor and the second temperature sensor, based on the signals from the first temperature sensor and the second temperature sensor, and detects the room temperature to calculate the electric power of the heater wire. It is configured to control.

According to another aspect of the present invention, a control board for controlling energization of the heater wire is provided in the controller, and the first temperature sensor is attached to the control board to control the temperature of the control board and the controller. It is configured to detect the internal temperature.

[0007]

The difference is detected by the calculating means based on the temperature signal from the first temperature sensor for detecting the temperature in the controller and the temperature signal from the second temperature sensor for detecting the ambient temperature, and the second temperature sensor based on the difference. Is corrected.

The first temperature sensor detects not only the temperature in the controller but also the temperature of the control board in the controller to prevent overheating of the heater wire.

[0009]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an electric circuit diagram when implemented on a carpet, FIG. 2 is a plan view of an electric carpet, FIG. 3 is a partial cross-sectional perspective view of a controller, and FIG. 4 is a cross-sectional view of a controller and a carpet. (1) is a planar warming device (hereinafter referred to as a carpet) made of an electric carpet, which is provided with a meandering heater wire (2) and a detection wire (3) adjacent to the heater wire and meandering. And a controller (4) provided at the peripheral corner.

As shown in FIG. 4, the controller (4) is provided with a large-volume storage chamber (5) near the carpet (1), and a large number of vent holes located farthest away from the carpet (1). (6) A small-volume compartment (7) provided with (6) ... is provided. (8) is a control board housed and fixed in the housing chamber (5), and is provided with electric components (9) (9) ... for controlling the energization of the heater wire (2). (1
0) is a first temperature sensor attached to the control board (8) and detecting the temperature in the controller (4);
The temperature of the control board (8) is also detected, and the power supply to the heater wire (2) is cut off when the temperature of the control board is higher than a predetermined temperature. (1
1) is a second temperature sensor provided in the compartment (7),
The air holes (6), (6) are exposed to the outside air, and a temperature closer to the temperature of the outside air is detected.

The electric circuit diagram will be described. (12)
Is a carpet temperature detecting means for converting the impedance of the detection line (3) into a temperature signal, (13) is a resistor connected in series to the first temperature sensor (10), and (14) is the second temperature sensor (11). Resistor connected in series to
5) The first and second temperature sensors (10), (11)
Is a first calculating means for calculating by inputting a temperature signal from
As shown in the temperature value of each sensor shown in FIG. 5 and the temperature change amount characteristic diagram of each sensor shown in FIG.
0) From the measured temperature (T1) to the second temperature sensor (11)
The value (△) obtained by subtracting the original room temperature (TC) from the predetermined measured temperature (T2) of the second temperature sensor (11) obtained based on the value (△ T1) obtained by subtracting the measured temperature (T2). T2) is obtained and stored as table data. These values (△ T1) and (△ T2) are experimentally obtained and are represented by a straight line (P), and if (△ T1) is determined, (△ T2) is naturally obtained. (1
6) The second operation is performed by using the output of the first operation means (15) and the temperature signal of the second temperature sensor (11) as inputs.
Calculation means for subtracting the actual measurement value (T2) of the second temperature sensor (11) from the value (ΔT2) obtained by the first calculation means (15) to obtain the room temperature (TC). is there. (17) means for controlling the heater wire (2), the room temperature (T) obtained by the second arithmetic means (16);
Based on (C), the amount of current supplied to the heater wire (2) is controlled. (1
8) A relay contact connected between the heater wire (2) and the AC power supply (19), which is opened and closed by the output of the control means (17).

Next, the operation will be described. Since the temperature of the carpet (1) is low at the beginning of use of the carpet (1), that is, at the beginning of energization of the heater wire (2), the first and second temperature sensors (10) and (11) as shown in FIG. Since the temperatures are almost equal, no correction by the second calculating means (16) is necessary. Eventually, when the temperature of the carpet (1) rises, the temperature detected by the first temperature sensor (10) rises under the influence of the temperature of the control board (8) and the temperature of the carpet (1), but the second temperature rises. The temperature detected by the sensor (11) hardly rises because it is exposed to the outside air by the ventilation holes (6) (6)... And is farther than the carpet (1).

For example, the measured temperature (T1) detected by the first temperature sensor (10) at the time (Q) shown in FIG.
Assuming the measured temperature (T2) detected by the temperature sensor (11), various calculations are performed by the first calculation means (15). (T1) − (T2) ≒ (△ T1), and the difference between the actually measured temperature (T2) of the second temperature sensor (11) and the original (actual) room temperature (TC) (currently unknown) is (T2) −
(TC) = △ T2. As described above, (△ T2) is originally a value closest to the room temperature (TC), but the room temperature cannot be obtained accurately.

Here, (△ T2) is obtained from the straight line (P) based on (△ T1) by the first calculating means (15) storing the table data shown in FIG.
To the calculation means (16).

The second calculating means (16) subtracts (ΔT2) from the measured value (T2) of the second temperature sensor (11) to obtain a room temperature (TC), and outputs a room temperature correction signal to the control means (1).
7). When the room temperature is low and the correction amount is large, the control means (17) increases the heating value of the heater wire (2) to increase the stability of the temperature after the set temperature of the carpet (1) is reached. Give it.

[0016]

According to the present invention, an accurate room temperature can be calculated by using two temperature sensors. Particularly, even if the temperature detected by the first temperature sensor is affected by the temperature of the planar heater, the calculation is performed in association with the temperature detected by the second temperature sensor to detect the room temperature. A close room temperature can be calculated.

Further, the first temperature sensor detects not only the temperature in the controller but also the temperature of the control board in the controller, and can control the energization of the heater wire when the temperature of the control board is higher than a predetermined temperature.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a planar electric heater of the present invention.

FIG. 2 is a plan view of the electric carpet according to the embodiment.

FIG. 3 is a partial sectional view of the controller.

FIG. 4 is a cross-sectional view of the controller and the carpet.

FIG. 5 is a characteristic diagram showing a relationship between measured temperature values of respective sensors and time.

FIG. 6 is a temperature change amount characteristic diagram of each sensor similarly stored as table data.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Planar heater 2 Heater wire 4 Controller 8 Control board 10 1st temperature sensor 11 2nd temperature sensor 15 1st arithmetic means 16 2nd arithmetic means 17 Control means

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Toyoki Yoshida 3-201, Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (72) Inventor: Naohiko Kishimoto 3-201, Minamiyoshikata, Tottori City, Tottori Prefecture Tottori (56) References JP-A-3-130326 (JP, A) JP-A-3-233243 (JP, A) JP-A 4-29714 (JP, U) JP-A 62-103186 ( JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 3/00 F24D 13/02 F24F 11/02 G01D 3/04

Claims (2)

(57) [Claims] 1. A planar heater having a heater wire disposed therein, a controller provided at a peripheral edge of the planar heater to control the temperature of the heater, and detecting a temperature in the controller provided in the controller. A first temperature sensor, a second temperature sensor provided at a position in the controller that is exposed to the outside air to detect an ambient temperature, and a calculation unit that inputs signals from the first temperature sensor and the second temperature sensor. Wherein the calculating means corrects the second temperature sensor based on signals from the first temperature sensor and the second temperature sensor, detects room temperature, and controls the electric power of the heater wire. vessel. 2. A control board for controlling energization of the heater wire is provided in the controller, and the first temperature sensor is attached to the control board to detect a temperature of the control board and a temperature in the controller. The planar electric heater according to claim 1, characterized in that: