JPS59164928A - Temperature detector - Google Patents

Abstract

PURPOSE:To obtain a temp. detector used even under an electric field containing a DC component electric field, by providing a condenser to one of a pair of the electrodes of the temp. detector utilizing an ion conductive type high-molecular temp. sensor. CONSTITUTION:An I-shaped high-molecular temp. sensor is constituted as a temp. detecting wire obtained by successively forming an inner winding electrode 2, an ion conductive type high-molecular temp. sensor 3, an outer winding electrode 5 and an outer cover 6 on a core yarn 1 and a pair of electrodes are formed by the inner and outer winding electrodes 3, 4. This temp. detection wire can be shown as a variable resistor due to a temp. and, by connecting a condenser 7 to one end thereof in series, the carrier of the high-molecular temp. sensor is only charged and discharged to the condenser 7 even if a DC component is applied and only carrier movement corresponding to the charging and discharging amount of the condenser 7 is generated. By this mechanism, the temp. detector can be used even under an electric field containing a DC component electric field.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature sensor used in a temperature control device for a planar heating device, such as an electric blanket.

Structure of Conventional Example and Its Problems In the past 6, a polymer thermosensitive body called a plastic thermistor was used as a temperature sensor for use in these temperature control devices. Depending on the conduction mechanism, this polymer temperature sensitive body has three types: ionic conduction type (hereinafter referred to as engineering type), capacitance type (hereinafter referred to as C type), and electronic conduction type (hereinafter referred to as E type).
It is divided into three types. In practical terms, nylon-based materials are selected for type C because they utilize changes in dielectric constant with temperature, and they have the disadvantage of being easily affected by hygroscopicity. Although active research is being conducted on the E-type, there are few examples of it being put into practical use due to the lack of flexibility and reliability in the conduction mechanism. On the other hand, Kogata's polymer thermosensitive body has excellent properties,
It has been put into practical use very often. However, since it is ion conductive, it exhibits a polarization phenomenon due to a DC component electric field, causing a change in impedance temperature characteristics, so it has the disadvantage that it cannot be a reliable temperature sensor under an electric field with a DC component. , it was not used under a DC component electric field.

Purpose of the Invention The present invention provides a temperature sensor that can be used under an electric field containing a DC component electric field, for example, an electric field with a pulse waveform such as a rectangular wave, a triangular wave, a sine wave, etc., and an electric field in which a DC component is superimposed on these electric fields. This is what we provide.

Structure of the Invention An ion-conducting polymer temperature sensitive body is provided between a pair of electrodes, and a capacitor or an equivalent circuit of a capacitor is provided on at least one of the pair of electrodes. This capacitor or an equivalent circuit of the capacitor was designed to have an impedance value lower than the minimum impedance in the temperature detection region of the ion-conducting polymer thermosensitive member.

With this configuration, even if a polarization phenomenon occurs in the ion-conducting polymer temperature sensor due to a DC component electric field, the capacitor or the equivalent circuit of the capacitor will be charged and discharged, which will affect the temperature detection function. not give.

Explanation of Examples Most of the ■-shaped polymer thermosensors have a core thread (1) as shown in Figure 1.
It is constructed as a temperature sensing line in which an inner wound electrode (2), an ion-conducting polymeric temperature sensor (3), an outer wound electrode (4), a separation layer (5), and an outer cover (6) are formed on top of the wire in this order. A pair of electrodes is formed by both the inner-wound electrode (2) and the outer-wound electrode (4).This temperature detection line can be expressed as a temperature-dependent variable resistor, and a capacitor (7) is connected in series to one end. When connected, the result will be as shown in FIG. 2(a).

In this case, even if a DC component is applied to the carriers of the ion-conducting polymer temperature sensitive body, the capacitor (7) K is simply charged and discharged, and the carriers only move by the amount of charge in the capacitor (7). . These waste carrier ions are electrolyzed and are not permanently consumed. 2nd diagram)
The circuit shown in can be represented by an equivalent circuit as shown in FIG. Temperature detection sensitivity will be higher if the capacitance C of the core used (7) is set to be as small as possible than the minimum impedance in the operating temperature range of the capacitive reactance Xc.

In addition, since the ■-type polymeric temperature sensitive body has a high volume resistivity, when it is configured with a double winding structure or a sandwich inch structure as shown in Fig. 1, the electrode area S becomes very large. Generally, the impedance is set to several MΩ or less. Therefore, as another example, if an insulating layer is formed on the surface of the electrode, its thickness can be reduced to the same level as forming a capacitor in series.Equivalent circuit to the circuit in Figure 2 (a) and (■) become.

Next, experimental results of the present invention will be shown.

Experimental results 1゜ Core yarn (1) is polyester, inner wound electrode (2) and outer wound electrode (4) are stainless steel wire, and polymeric temperature sensor (3) is ion conductive polychloride containing organic perchlorate. Using a vinyl composition, the separation layer (5) is a polyester film, the outer cover (6)
Soft polyvinyl chloride was used for the temperature detection line shown in Figure 1. The characteristic of this temperature detection line is (A) in Figure 3 at 60Hz.
The characteristics when the capacitor (7) is connected in series are shown in the graph shown in (B).

Next, we applied a 100VAC half-wave and conducted a heat resistance test at 80°C for 2000 hours to obtain the impedance-temperature characteristics (Z-
Then, as shown in Figure 4, Zl-T
There was almost no change in the characteristics when compared with the Zo-T characteristics, which were the initial characteristics, and the results were similar to the results of a heat resistance test using AC full wave application using the temperature detection circuit alone. On the other hand, when an AC half wave is applied without a capacitor, the Z2=T characteristic becomes the fourth
As shown in the figure, there was a large change over time. However, this.

In their experiments, they conducted a heat resistance test by connecting a 10Ω resistor in series to prevent runaway phenomena due to self-heating.

Experimental Results 2゜Experimental Results 1 Using aluminum-plated conductive wire as the electrode material, the surface of which was oxidized to form an alumite layer, the effect was investigated in the same manner as in the procedure shown in Experimental Results 1. Similar to Experimental Results 1, good results were obtained.

The temperature sensor of the present invention can be used in the temperature control device shown in FIG. do. Input the temperature signal current to the temperature detection circuit 1D and turn on the sirinuta. to control the heater (12).

Furthermore, as shown in FIG. 6, if one of the pair of electrodes of the temperature detection line is also used as a heater (12), it can also be used in a one-line temperature control device driven by an AC power source (3).

Effects of the Invention The present invention provides a capacitor or an equivalent circuit of a capacitor on at least one of a pair of electrodes of a temperature sensor using an ion-conducting highest molecular temperature sensor.
It is possible to provide a temperature sensor that can be used even under an electric field including a DC component electric field, which could not be used conventionally.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a temperature detection line using an ion-conducting highest molecular temperature sensor, FIGS. 2(a) and (1)) are equivalent circuits of the temperature sensor of the present invention, The figure shows the Z-T characteristics of the temperature sensor of the present invention and the conventional example, Figure 4 shows the Z and -T characteristics of the temperature detection line obtained by the heat resistance test, and Figure 5 shows the temperature sensor of the present invention. FIG. 7 is a circuit diagram showing another embodiment of the driving temperature detector. (2)...Inner wound electrode, (3)...Ion conductive highest molecular temperature sensitive body, (4)...Outer wound electrode, (7)...Capacitor, (8)...Temperature detection U2I... Heater agent Patent attorney Island - Public Figure 1 Figure 3 SI L degree T ('C) Figure 4 s = degree T (OC')

Claims (3)

[Claims] (1) An ion conductive polymer temperature sensitive body is provided between a pair of electrodes, and a capacitor having an impedance lower than the minimum impedance in the temperature detection area of the ion conductive polymer temperature sensitive body is attached to at least one of the pair of electrodes. Or a temperature detector equipped with an equivalent circuit of a capacitor. (2) The temperature sensor according to claim 1, wherein one of the pair of electrodes is made of an insulated conductor to serve as a capacitor. (3) The temperature sensor according to claim 1, wherein one of the pair of electrodes is a heater.