JPH02268308A - Temperature controller - Google Patents

Abstract

PURPOSE:To reduce the overshoot by controlling power supply to a heater by a control means at the time of turning on a power switch and turning on a high temperature setting means for a certain time by a timer after arrival of the signal voltage at a set voltage. CONSTITUTION:After a power switch 8 and a relay 6 are turned on, a voltage V2 set by a variable resistance 2 is compared with a detected voltage V1. When the voltage V1 is lower than or equal to the voltage V2, they are kept turned on; and when the voltage V1 exceeds the voltage V2, the variable resistance is short-circuited by a high temperature setting means 9 to set a high temperature. Counting of a timer 10 is started simultaneously, and high temperature control is performed for a certain time till expiration of the timer 10. After expiration of the timer 10, the high temperature setting means 9 is turned off, and the set temperature is returned to the temperature set by the variable resistance 2 to perform the normal control. By this constitution, the detected temperature and the set temperature are compared with each other by a comparator 3, and the temperature control is performed with a satisfactory rise temperature just after the start of power supply and less overshoot even for low temperature control regardless of the use of a microcomputer of low function.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to temperature control 81 for electric heating appliances such as electric carpets and floor heating.

2. Description of the Related Art The control of a conventional temperature control device for electric heating appliances of this type, such as electric carpets, will be explained with reference to FIGS. 4 to 6. FIG. 4 is a circuit diagram of the temperature control device a. In FIG. 4, the detected voltage (1) of the carpet body detected by the temperature sensor 11 and the set voltage (2) set by the variable resistor 2 (1111 setting means) are compared by the comparator 3, and the result after the comparison is sent to the control unit. 4 input. When the temperature caused by the heater wire 5 becomes high, the control section 4 drives the relay 6 on the output side, opens the relay switch 7 of the circuit of the heater s5, and operates to stop the power supply to the heater 115.

In recent years, electric carpets have a heater of 1lA5 and a temperature sensor of 11
A high-quality cover is often placed over the main body with a built-in power supply, and as a result, the heat generated by the heater wire 5 is difficult to be transmitted to the cover surface, and the rise characteristics of the surface temperature after the power switch 8 is turned on are reduced. It becomes a problem.

In order to improve this, temperature adjustment as shown in the flowchart of FIG. 5 is generally performed. That is, in step 1, the mff switch 8 is turned on, and in step 2, the strong temperature setting means 9 short-circuits the variable resistor 2, and the set temperature is set to the set maximum temperature r! ! (hereinafter referred to as "strong" temperature). In step 3, relay 6 is turned on, and in step 4, heater l is turned on until the detected temperature reaches the set temperature, that is, the "strong" temperature.
115 continues to be energized. When the detected temperature reaches the set temperature, the strong temperature setting means 9 is turned off in step 5 to return the set temperature to the setting of the variable resistor 2, and thereafter normal temperature control is continued as in step 6.

Problem to be Solved by the Invention However, in this method, regardless of the temperature setting, full current is always applied for the time t1 until reaching the "strong" temperature as shown in Fig. 6, so it is not suitable when the set temperature is high. but,
If the set temperature is low, the overshoot caused by the strong temperature controller will increase, making you feel uncomfortable. In FIG. 6, the characteristic curve shows the temperature at the cover surface.

In order to eliminate this overshoot, the detection voltage V1
It is sufficient to detect the set voltage and set voltage (2) and adjust the full energization time, but this requires an A/D conversion circuit, which poses problems in terms of size and cost.

The present invention solves the above-mentioned conventional problems, and aims to provide a temperature 11jlJ control device that improves the rise characteristics of the surface temperature at the time of starting energization, especially when setting a low temperature, without using A/D conversion. That is.

Means for Solving the Problems In order to solve the above problems, the temperature control device of the present invention includes:
a heater wire, a temperature detection line for detecting the temperature of the heater wire, a temperature setting means for setting a voltage corresponding to a control temperature of the heater wire, a set voltage of the temperature setting means and a signal voltage of the temperature detection line; a control means for controlling the opening/closing means for energizing the heater wire; a strong temperature setting means for setting the set voltage to a voltage corresponding to the highest strong temperature; and a power switch for instructing the start of energization. , O of the power switch
and a timer means for counting a certain period of time from the time when the signal voltage of the temperature detection line reaches the set voltage after N, the control means controls energization to the heater wire by turning on the power switch, After the signal voltage reaches the set voltage, the intensity setting means is turned on for a constant vf set by the timer means.

Effect With the above configuration, after the power switch is turned on, it is detected whether the detected temperature has reached the set temperature, and after the detected temperature has reached the set temperature, the set temperature is set to 1" by the strong temperature setting means, and the temperature is set for a certain period of time. After that, normal control is continued with the set temperature set by the temperature setting means. Therefore, even during low temperature control, overshoot due to strong temperature control is reduced, and the user does not feel uncomfortable.

Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of a temperature control device according to an embodiment of the present invention. In Fig. 1, a comparator 3 compares the detection voltage 1 of the carpet body detected by the temperature detection line 1 and the set voltage V2 set by the variable resistor 2 which is the temperature setting means, and the result of the comparison is used to control the The unit 4 drives the relay 6 on the output side and controls the energization of the heater m5, and since these are the same as those of the prior art described above, a detailed explanation thereof will be omitted.

The difference from the conventional figure 4 is that a timer means 10 is provided, and after turning on the power switch 8, when the detected temperature reaches the set temperature, the strong temperature setting means 9 is turned on for a certain period of time.
The point is to set the temperature to "strong".

In the flowchart of FIG. 2, after turning on the power switch 8 in step 7 and turning on the relay 6 in step 8, the set voltage V2 set by the variable resistor 2 and the detected voltage V1 are compared in step 9. As a result, ONL continues until the detected temperature reaches the set temperature. If the detected temperature becomes equal to or higher than the set temperature in step 9, the strong temperature setting means 9 short-circuits the variable resistor 2 in step 10 to set the "strong" temperature.

At the same time, in step 11, the timer means 10 starts counting, and in step 13, the timer means 10 starts counting for a certain period of time (for example, 5 minutes) as in step 12 until the timer means 10 times out.
Control with "strong" temperature. If the timer means 10 times up, the strong temperature setting means 9 is set to 0FFL in step 14, and the set temperature is returned to the temperature set by the variable resistor 2, and normal control is performed in step 15.

FIG. 3 shows the time course of the main body surface temperature at this time. The time t1' until the detected temperature reaches the set temperature differs depending on the set temperature. The time from 11/ to t2 is kept constant by the timer means 10. As can be seen from FIG. 3, as the set temperature approaches the "strong" temperature, j t 1 hour becomes longer, and when the set temperature is r "strong" temperature, it becomes equal to the t1 time in FIG. 6. However, when the set temperature is low, t1
' is shorter, and there is less overshoot up to t2 than in FIG.

In this embodiment, for the sake of simplicity, the relay is turned on until the detected temperature reaches the set temperature or higher in steps 7 to 7 in FIG. 2, but the upper limit of the relay ON time may be regulated. Furthermore, it is clear that the same effect can be obtained by changing the timer time from step 11 to step 13 based on the time from step 7 to step 9.

Effects of the Invention As described above, according to the temperature control device 11 of the present invention, after the power switch is turned on, the detected temperature is first compared with the set temperature to change the start-up control time. This comparison can be made by the comparator 3, and even a low-function microcomputer without a built-in A/D conversion circuit can provide good rise temperature characteristics immediately after starting energization, and can perform temperature control with little overshoot even during low-temperature control.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a temperature control device according to an embodiment of the present invention;
Figure 3 is a flowchart showing the temperature control of the device, Figure 3 is a characteristic diagram showing the time course of the surface temperature of the device, Figure 4 is a circuit diagram of a conventional electric carpet temperature control device, Figure 5
The figure is a flowchart showing the temperature control of the device, and FIG. 6 is a characteristic diagram showing the time course of the main body surface temperature of the device. DESCRIPTION OF SYMBOLS 1...Temperature detection line, 2...Variable resistance (temperature control means), 3...Comparator, 4...Control unit, 5...
Heater wire, 6... Relay, 8... Power switch, 9
. . . strong temperature setting means, 10 . . . timer means. Agent Yoshihiro Morimoto 1st--Ichion/I-Shikichibell 2--Ge-to-katsu-3--Comparator 5--L5-9 line 6--Relayto electric switch Q-Kanmemasa/ I Firm Stirrup Figure 7 Figure 3 Figure 4 Figure 5 [

Claims (1)

[Claims] 1. A heater wire, a temperature detection line for detecting the temperature of the heater wire, a temperature setting means for setting a voltage corresponding to the control temperature of the heater wire, and a signal of the set voltage of the temperature setting means and the temperature detection line. a control means for comparing the voltage and controlling means for opening and closing energization to the heater wire, and a strong temperature setting means for setting the set voltage to a voltage corresponding to the highest strong temperature;
The control means includes a power switch for instructing the start of energization, and a timer means for counting a certain period of time from the time when the signal voltage of the temperature detection line reaches the set voltage after the power switch is turned on. A temperature control device configured to control energization of the heater wire by turning on, and turn on the strong temperature setting means for a certain period of time set by the timer means after the signal voltage reaches the set voltage. .