JPH025388A - Temperature controller for electric heater - Google Patents

Abstract

PURPOSE:To improve the rising characteristic by providing a temperature detecting means and a temperature setting means and changing the set value based on the difference between the set value and a detected value to perform proper temperature control. CONSTITUTION:A temperature detecting means 13 is turned on in the negative half cycle of an AC power source 11, the current flowing in a heating element 3 is converted into the voltage V1 and inputted to a control means 23 in a microcomputer 22. The voltage V1 is a detected value obtained by converting the impedance change of a temperature sensor 6 using a polymer heat sensitive element into an electric signal with the means 13. The set voltage V2 of the first temperature setting means 20 is once inputted to the second temperature setting means 31 of the microcomputer 22. The means 23 determines the change quantity based on the difference between the voltage V1 and the voltage V2 via the count value of a timer means 25 and sets the second temperature set voltage. When the voltage V1 is lower, the means 23 turns on a power control means 12 and excites the heating element 3. The current is fully fed at first, the control temperature is gradually lowered to perform proper control, thereby the good rising feeling characteristic is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control device for electric heating appliances such as electric carpets and floor heating.

2. Description of the Related Art An example of the main body structure of a conventional electric heating appliance of this type, such as an electric carpet, is shown in FIG. A temperature sensor 2 for detecting the surface temperature and a heating wire 3 are wired inside the electric carpet body (hereinafter referred to as the body) 1, and the surface temperature detected by the temperature sensor 2 is equal to the set temperature set in the controller box 4. The supply of electricity to the heating wire 3 is controlled in this manner.

In addition, there are many types in which a thick cover 5 with high absorption is placed over the main body 1. This makes it difficult for the heat generated by the heating wire 3 to be transmitted to the surface of the main body 1 or the cover 5.

FIG. 4 shows a so-called two-wire type case in which the heat generating wire 3 and the temperature sensor 2 are separated, whereas FIG. Heater Pi
17 single-line temperature control system
A configuration diagram of the device is shown. FIG. 5 is a partially cutaway side view of this temperature-sensitive heater ridge 7, showing the electrode wire 8 wound on the core thread 9 and the bithermal I! A polymer temperature sensitive body 6 whose impedance changes depending on the temperature is filled between i13. 10 is the outer skin.

FIG. 5 shows a circuit diagram of a conventional single line electric carpet. In FIG. 6, for AC power supply 11, Binetsu 9!3
, and a contact 12a of a relay 12 serving as a power control means are connected in series. The base-grounded temperature detection transistor 13 serving as temperature detection means receives a temperature signal current flowing through the diode 14, the electrode wire 8, the polymer temperature sensor 6, and the heating wire 3 during the negative half cycle of the AC power supply 11. It is converted into a temperature signal voltage V1 by a resistor 15 and a capacitor 16 connected to the collector side. On the other hand, a diode 17, resistors 18 and 19, and a variable resistor 2 which is a temperature setting means.
0 and capacitor 21 to set the temperature setting V2.

The temperature signal voltage V1 and the temperature setting voltage V2 set by the variable resistor 20 are input to a control means 23 in a microcomputer (JJ, referred to as a lower microcomputer) 22. Control means 23
compares the input temperature setting voltage V2 and the temperature signal voltage V1, and if the detected temperature is lower, turns on the transistor 24, which is the drive means, and turns on the relay 12, which is the power control means.
ONL, the heating wire 3 is energized via the contact 12a. A counter 25 serving as a timer measures a certain period of time after the start of energization.

Next, the operation will be explained using the flowchart shown in FIG. When the power is turned on, the counter 25, which is a timer means, is cleared in step 26, and the measurement of the full energization time is started in step 27. During the full energization time, the relay 12 is ON. This is to bring the surface temperature of the main body 1 and cover 5 closer to the set temperature quickly. When full energization is completed in step 28, the 12th model performs temperature detection in step 29, and in step 30, temperature signal voltage V1 and temperature setting voltage V2 are detected.
If the detected temperature is lower than the set temperature, relay 12 is turned ON, and if the detected temperature is higher, relay 12 is turned ON.
FF. The temperature change at this time is as shown in FIG.

- In the case of a wire type, the heat generating wire 3 and the polymer temperature sensitive body 6 are integrated as shown in FIG. is fast. Therefore, at the end of full energization, the temperature on the surface of the cover 5 has not yet reached the set temperature, but the temperature detected by the polymer temperature sensitive body 6 has already exceeded the set temperature. Therefore, at the time t1 when full energization ends, some of the relays 12 are controlled at 0FFL, then at the set temperature, and by repeating 0N10FF, the entire surface of the cover 5 gradually warms up, and eventually reaches the set temperature.

Problems to be Solved by the Invention However, in the above configuration, the temperature of the heating element 3 is more easily detected by the polymer temperature sensitive element 6 than by the surface of the main body 1 and the cover 5, so as shown in FIG. There is a problem in that it takes time for the surface temperature of the cover 5 to reach the set temperature. Furthermore, if the time for full energization up to tl is too long, the surface temperature of the main body 1 becomes too hot, causing a problem that the user feels uncomfortable.

The present invention solves the above-mentioned problem, and aims to provide a temperature control device for an electric heating appliance with a custom-made rise sensitivity immediately after the start of energization.

Means for Solving the Problems In order to solve the above problems, the intestinal control ill device of the present invention has the following features:
A heat generating wire that contributes to heat collection, a power control means that controls energization to the heat generating wire, a driving means that drives the power control means, and a polymer temperature sensitive body that detects a temperature signal of the heat generating wire. a temperature sensor, a temperature detection means for converting an impedance change of the temperature sensor into an electrical signal, a first temperature setting means for setting the heating wire to a desired temperature, and a timer for counting the elapsed time from the start of energization. means, a second temperature setting means for setting a control temperature that is a certain temperature higher than the set temperature of the first temperature setting means, based on a timer count value of the timer means; and a second temperature setting means set by the second temperature setting means. and control means for controlling the driving means at a controlled temperature.

Effect With the above configuration, the temperature at the start of energization is fully energized for a period determined from the temperature setting and the temperature sensor, and the aftertaste 2 temperature setting means is used to gradually lower and control the set temperature, thereby controlling the rise temperature characteristics immediately after the start of energization. It can be improved.

Example Hereinafter, one embodiment of the present defense will be described based on the drawings.

FIG. 1 is a circuit diagram of a temperature control device showing one embodiment of the present invention. Components that are the same as those in the conventional example are given the same reference numerals, and their explanations will be omitted. In Figure 1, the microcomputer 22
A second temperature setting means 31 is provided.

In its operation, first, the temperature detection transistor 13, which is a temperature detection means, is turned ON in the negative half cycle of the AC FM source 11.
,, diode 14, electrode 118, polymer temperature sensitive body 6,
A temperature signal current flowing through the heat generator 1i13 is converted into a temperature signal voltage V1 by a resistor 15 and a capacitor 16 connected to the collector side. The temperature signal voltage V1 is input to the control means 23 within the microcomputer 22.

On the other hand, the temperature setting voltage (2) set by the variable resistor 20''c' is input to the second temperature setting means 31 in the -H microcomputer 22. Based on the elapsed time, it is determined how much the control temperature should be changed from the temperature setting voltage V2, and the control means compares it with the temperature signal voltage V1.If the detected temperature is low, the transistor 24, which is the driving means, is set to ONL,
The relay 12, which is a power control means, is energized to the ONL and the heating wire 3.

Further details will be explained with reference to the flowchart in FIG. When the power is turned on, the counter, which is a timer means, is cleared and starts counting. In step 32, the full energization time t1' shown in FIG. 3 is determined from the difference between the temperature signal voltage v1 and the temperature setting voltage V2 at that time. When full energization is completed in step 33, temperature is detected in step 34, and then in step 35, temperature T(1) determined by the elapsed time t from power-on is added to the set temperature, and it is set as the control temperature. .

In step 36, this control temperature and the detected temperature are compared, and if the control 11 temperature is higher, the relay is turned ON, and if the detected temperature is higher, the relay is turned OFF. Then step 34
Return to As shown in Figure 3, the temperature change at this time is not immediately lowered to the set temperature even after full energization, but is changed in stages, so the temperature of the cover surface remains at the set temperature even after full energization. The temperature is increased rapidly until the point t2 when the temperature is reached. Therefore, the problem that it takes too long for the cover surface temperature to reach the set temperature after the end of full energization as shown in FIG. 8 is eliminated.

Effects of the Invention As described above, the temperature control device of the present invention starts energizing the heating wire, fully energizes it for a certain period of time, and then gradually lowers the control temperature to the set temperature as time passes.
Temperature control with good rise temperature characteristics immediately after the start of energization is possible.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a temperature control device showing an embodiment of the present invention, Fig. 2 is a flowchart showing temperature control of the temperature control device, and Fig. 3 shows the time course of the temperature control device's main body surface temperature. Figure 4 is a diagram of the main body configuration of a conventional electric carpet, Figure 5 is a partially cutaway side view of a temperature-sensitive heater wire, and Figure 6 is a conventional temperature control of an electric carpet using a temperature-sensitive heater wire! FIG. 7 is a flowchart showing the temperature control of the conventional temperature control device, and FIG. 8 is a diagram showing the time course of the main body surface temperature of the conventional temperature control device. 3... Heat generating wire, 6... Polymer temperature sensitive body, 7... Temperature sensitive heater wire, 11... AC power supply, 12... Relay (N
power control means), 13... temperature detection transistor (temperature detection means), 20... variable resistor (first temperature setting means), 22... microcomputer, 23... control means, 24
. . . transistor (driving means), 25 . . . counter (timer means), month . . . second temperature setting means. Agent: Hiroshi Morimoto

Claims (1)

[Claims] 1. A heating wire that contributes to heat collection, a power control means for controlling energization to the heating wire, a driving means for driving the power control means, and a polymer temperature sensitive body that detects a temperature signal of the heating wire. The temperature sensor used, a temperature detection means for converting the impedance change of the temperature sensor into an electrical signal, a first temperature setting means for setting the heating wire to a desired temperature, and counting the elapsed time from the start of energization. timer means for
a second temperature setting means for setting a control temperature that is a certain temperature higher than the setting temperature of the first temperature setting means according to the count value of the timer means; and a control temperature set by the second temperature setting means. and a control means for controlling the driving means, the temperature control for an electric heating appliance is configured to fully energize the heating wire immediately after the start of energization, and then gradually lower the control temperature according to the count value of the timer means. Device.