JPH0254885A - temperature control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature control device for electric carpets, floor heating, electric blankets, etc., using a polymer thermosensitive material.

BACKGROUND OF THE INVENTION Temperature control devices for electric carpets and the like generally use temperature sensing wires having a polymer temperature sensitive body.

FIG. 3 shows an example of the configuration, in which the heater wire 1 and the electrode wire 2
By interposing the polymer thermosensitive body 3 between the heater wire 1 and the heater wire 1, the voltage V1 on the temperature sensing wire 4 is
The controller 5 compares the set voltage v2 with the heater wire 1.
When the temperature becomes high, the comparison operation of the control section 5 drives the relay 6 on the output side, opens the relay switch 7 of the circuit of the heater wire 1, and stops the energization.

Problem to be Solved by the Invention However, as shown in FIG. 4, the temperature detection wire 4 is formed by winding the electrode wire 2 on a core thread 8 and then passing the heater wire 1 through a polymer thermosensitive material 3 layered on top of the electrode wire 2. Since it has a structure in which the tube is wound and a coating 9 is further provided on the outer periphery, moisture easily enters the interior through the coating 9. In this case, the polymer thermosensitive body 3 contains moisture, and the impedance becomes lower than when it does not absorb moisture.
As shown in the figure, when moisture is absorbed, the impedance shows a value similar to that at high temperatures. However, since there is no means for determining whether or not the polymer thermosensitive body 3 has absorbed moisture, even if an attempt is made to cause the heater wire 1 to generate heat in such a moisture-absorbed state, the control unit 5 does not control the relay 6.
was driven to turn off the relay switch 7, and even though the temperature was low, the heater wire 1 could not generate heat, and could only be controlled at a lower temperature than when no moisture was absorbed, as shown in FIG.

The present invention solves the above problems and provides a temperature control device that allows the heater wire to normally operate to generate heat even if the temperature detection wire is in a moisture-absorbing state.

Means for Solving the Problems In order to solve the above problems, the temperature control device of the present invention includes a control unit having means for comparing the signal voltage of the temperature detection line and a first set voltage, and It is equipped with a moisture absorption determination section having a power control means for controlling opening/closing of energization, and a means for comparing a signal voltage of the temperature detection line with a second set voltage, and the second set voltage is determined by the polymer temperature sensing The signal voltage is approximately equal to the signal voltage of the temperature detection line when the body absorbs moisture, and when the polymer thermosensitive material of the temperature detection line absorbs moisture, the moisture absorption determination section corrects the control section and controls the energization of the heater wire. be.

Effect With the above configuration, when the temperature becomes high, the impedance of the polymer thermosensitive element of the temperature detection line becomes low, the comparison voltage of the temperature detection line becomes low, and the control section performs control to cut off the current supply to the heater wire. do.

When the polymer thermosensitive material of the temperature detection line absorbs moisture,
Although the impedance of the polymer thermosensitive body is low in the same manner as described above, the moisture absorption determination section compares the comparison voltage with the second set voltage, and performs correction control on the control section to control the energization of the heater wire.

EXAMPLE Hereinafter, a temperature control device showing one practical example of the present invention will be explained based on FIG.

In FIG. 1, reference numeral 4 denotes a temperature detection line, which is composed of a heater wire 1, an electrode wire 2, and a polymer thermosensitive member 3.

The heater wire 1 is connected to a power source 10, and energization is controlled by a relay switch 7 of a relay 6 driven by a control section 5. The detected voltage v1 of the temperature detection line 4 is given to the control section 5 together with the first set voltage v2 for comparison, and since these are the same as those of the conventional device described above, their explanation will be omitted.

The characteristic configuration of this embodiment is that a second set voltage v3 is created by the resistors 11 and 12, and this is compared with the detected voltage v1 of the temperature detection line in the moisture absorption determination section 13. This is because the control section 5 is configured to perform correction control. The second set voltage v3 is the temperature detection line 4.
Detection voltage v1 when the polymer thermosensitive body 3 absorbs moisture
The voltage is approximately equal to . Further, a timer means 14 is connected to the control section 5 in order to forcibly supply electricity for a predetermined period of time.

In this circuit, when the relay 6 is OFF, a uniform electric field is applied between the polymer temperature sensitive body 3 and the electrode wire 2 at any part thereof, and the temperature of the entire heater wire 1 can be accurately detected. While the relay 6 is ON, a potential gradient is generated between the polymer temperature sensitive body 3 and the electrode wire 2 due to the AC power supply 10, so that the temperature of the entire heater wire 1 cannot be accurately detected. However, since this state does not depend on whether the polymer temperature sensor 3 absorbs moisture or not, the temperature detection line 4 can be detected even when the relay 6 is ON. Based on the difference in voltage v1, it is possible to determine whether the polymer thermosensitive body 3 absorbs moisture or not.

In this embodiment, moisture absorption determination is performed when the relay 6 is ON, and temperature detection is performed when the relay 6 is OFF.

The setting voltage v3 in FIG. 2 is, for example, the temperature signal voltage V in FIG.
Indicates T. When the carpet is not absorbing moisture, the surface temperature of the carpet is at a maximum of about 50° C., and the detection voltage v1 never drops to VT.

When the power is turned on, the timer means 14 starts counting a certain period of time (for example, 15 minutes) at the same time as the power supply starts. After a certain period of time has passed, with relay 6 ON, the detection voltage V1 and
The second set voltage v3 is compared in the moisture absorption determining section 13. If the detection voltage v1 is lower than the second set voltage v3, the second set voltage v3 is set to a voltage approximately equal to the detected voltage v1 during moisture absorption, so this actually means that the temperature It is determined that this is not because the temperature detection line 4 is high, but because the temperature detection line 4 is absorbing moisture, and the moisture absorption determining section 13 outputs a moisture absorption detection signal. Based on the moisture absorption detection signal, the control unit 5 corrects the first set voltage v2 for moisture absorption to a lower value (toward a higher temperature side) and compares it with the detected voltage v1 of the relay 6 at 0FFV?, thereby controlling the temperature.

When the detection voltage v1 is higher than the set voltage v3 in FIG. 2, it is determined that the temperature detection line 4 is not absorbing moisture, and the moisture absorption determining section 13 does not output a moisture absorption detection signal. Therefore, the control section 5
compares the first set voltage v2 with the detected voltage v1 when the relay 6 is OFF without correcting it, and performs temperature control. As shown in FIG. 2, the temperature to be controlled in this case can be almost the same as that of the non-hygroscopic 115 by moisture absorption correction.

Effects of the Invention As is clear from the description of the embodiments above, the temperature control device of the present invention can detect moisture absorption in the temperature detection line and can correct it, so even when moisture is absorbed in the temperature detection line, the temperature is abnormally lower than the set temperature. (Also, since a temperature detection circuit is used to detect moisture absorption of the temperature detection line, moisture absorption detection can be performed with a simple circuit configuration.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a temperature control device according to an embodiment of the present invention; Fig. 2 is a diagram showing the time course of the main body surface temperature of the device;
Figure 4 is a configuration diagram of a conventional electric carpet temperature control device, Figure 4 is a configuration diagram of a temperature detection line, Figure 5 is a diagram showing the relationship between the surface temperature of the device and the temperature signal voltage, and Figure 6 is a diagram showing the relationship between the body surface temperature and temperature signal voltage of the device. FIG. 3 is a diagram showing the time course of the main body surface temperature of the device. 1... Heater wire, 3... Polymer temperature sensitive body, 4... Temperature detection line, 5... Control unit, 6
...Relay, 7...Relay switch, 1
3...Moisture absorption determination section. Name of agent: Patent attorney Shigetaka Awano and 1 other person

Claims (1)

[Claims] a control unit having means for comparing the signal voltage of the temperature detection line and a first set voltage; a power control unit for controlling opening/closing of energization to the heater wire according to the output of the control unit; the second set voltage has a value approximately equal to the signal voltage of the temperature detection line when the polymer temperature sensitive body of the temperature detection line absorbs moisture; None, a temperature control device in which the moisture absorption determination section corrects and controls the control section to control energization of the heater wire when the polymer temperature sensitive body of the temperature detection line absorbs moisture.