JP2555977Y2 - Temperature control device for heating equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for a heating device such as an electric carpet.

[0002]

2. Description of the Related Art For example, in an electric carpet, a heater wire is wired on a carpet body to heat the carpet body. Technology is provided. For example, there is a technique in which correction is performed such that the target temperature is increased by a fixed temperature for a predetermined period from the time of energization, and thereby the temperature of the carpet body reaches the target temperature quickly. Further, as another technique, there is a technique in which a correction such as an increase in the target temperature is performed until the temperature of the carpet body reaches the target temperature to quickly reach the target temperature. As still another technique, it is determined whether or not to correct the target temperature at the start of energization based on the difference between the room temperature and the temperature of the carpet body. Based on this determination, correction such as increasing the target temperature for a predetermined period from the energization is performed. There is something.

However, in each of the above techniques, if the carpet body is kept warm and the temperature of the carpet body is high, or if the carpet body is energized and re-energized before the carpet body temperature decreases, the temperature of the carpet body will be reduced. The temperature becomes higher than the target temperature, that is, the temperature of the carpet body overshoots at the start of energization. Further, if the power is supplied again before the temperature of the carpet main body decreases, the target temperature corrected at the time of the current supply becomes higher, and the temperature of the carpet main body becomes higher. Also, when the temperature correction at the time of energization is completed and the target temperature is set, there is a difference between the corrected target temperature and the target temperature, and the temperature of the carpet body may drop temporarily.

[0004]

As described above, the correction of the target temperature during energization is improper, and the rising temperature during energization becomes unstable.

Accordingly, an object of the present invention is to provide a temperature control device capable of controlling the temperature at the time of the rise of energization to a stable state without overshoot and temperature drop.

[0006]

According to the present invention, there is provided a temperature sensor for detecting a temperature of a heating device such as an electric carpet, and a time period when the temperature of the heating device detected by the temperature sensor reaches a first temperature set in advance. And a first correction circuit that corrects the target temperature according to this time, and measures the time when the temperature of the heating device reaches the corrected target temperature, and calculates the corrected target temperature according to this time as the target temperature. And a second correction circuit for sequentially calculating the length of time until the temperature returns to the target temperature and sequentially changing the target temperature to the target temperature.

[0007]

With the provision of such means, the first correction circuit measures the time when the temperature of the heater detected by the temperature sensor reaches the preset first temperature, and sets the target temperature in accordance with this time. The second correction circuit measures the time required for the temperature of the heating device to reach the corrected target temperature, and calculates the length of time required to sequentially return the corrected target temperature to the target temperature in accordance with this time. To sequentially change to the target temperature.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a temperature control device of a heating device applied to an electric carpet. A heater wire 3 is connected to the AC power supply 1 via a switching element 2 such as a thyristor. Note that the heater wire 3 is disposed on the carpet body. A temperature sensor 4 is wired to the carpet body.

On the other hand, a target temperature setting circuit 5 is provided, and a signal corresponding to the target temperature Tm set by the target temperature setting circuit 5 is sent to a comparison circuit 7 via an adder 6.

The temperature detection signal output from the temperature sensor 4 is sent to a first timer circuit 8 and a second timer circuit 9. The first timer circuit 8 of these timer circuits 8 and 9 measures the time when the temperature of the carpet body detected by the temperature sensor 4 reaches a preset first temperature T ₀ , for example, 30 ° C., and determines the time t 1. Temperature correction circuit 10
Has the function of sending to

The second timer circuit 9 measures the time required for the temperature of the carpet body to reach the target temperature T (t1) corrected by the temperature correction circuit 10 based on the time t1 and measures the time t2 as a third timer. It has a function of sending it to the circuit 11.

The third timer circuit 11 receives the time t2, and the target temperature T (t1) corrected according to the time t2.
Has a function of obtaining a time F (t2) for sequentially changing the temperature to the target temperature Tm and sending the time to the temperature correction circuit 10.

[0014] The temperature compensation circuit 10, adder correction signal temperature of the carpet body from the first timer circuit 8 receives the time t1 to reach the first temperature T _0, to increase or decrease the target temperature Tm in accordance with the time t1 The first function sent to the sixth, the third
It has a second function of receiving a time t2 from the timer circuit 11 and transmitting to the adder 6 a correction signal for sequentially changing the target temperature T (t1) to the target temperature Tm according to the time t2.

Here, the corrected target temperature T (t1) is expressed by the following equation. T (t1) = Tc + K1 × t1 (1) where Tc is a minimum correction value and K1 is a constant. Generally, Tc is approximately 2 deg, and K1 is approximately 0.05 [deg /
Minute].

The time F (t2) for sequentially changing the target temperature T (t1) to the target temperature Tm is a time inversely proportional to the time t2. That is, F (t2) = K2 / t2 (2). Here, K2 is approximately 600 [s ² ]. Further, the time F (t2) may be approximated by a straight line, and may be expressed as F (t2) = Tc0−K3 × t2 (3). However, Tc0 is a constant of approximately 60 and K3 is approximately
1,5. By knowing the rising slope at time t2, the temperature difference between the temperature detected by the temperature sensor 4 and the carpet surface temperature increases at a sharp rising, so that the time to reach the target temperature Tm becomes longer. Therefore, time F
(t2) is a value inversely proportional to time t2.

With the above arrangement, the first timer circuit 8 and the temperature correction circuit 10 measure the time required for the temperature of the carpet body detected by the first correction circuit, that is, the temperature of the carpet body, to reach a preset first temperature T _0. And this time t1
Has a function of correcting the target temperature Tm in accordance with

The second timer circuit 9 and the third timer circuit 1
The second correction circuit, that is, the time required for the temperature of the carpet body to reach the target temperature T (t1) is measured by the first and temperature correction circuits 10, and the target temperature T (t1) is sequentially returned to the target temperature Tm according to this time t2. Time F (t2) until the target temperature F (t
The function has the function to change sequentially in 2).

The comparison circuit 7 has a function of inputting a target temperature from the adder 7 and a temperature detection signal from the temperature sensor 4 and controlling the switching element 2 to be turned on / off according to the temperature difference. . Next, the operation of the device configured as described above will be described with reference to the operation timing chart shown in FIG.

When the power switch is turned on and electric power is supplied from the AC power supply 1 to the heater wire 3 through the switching element 2, the temperature sensor 4 detects the temperature of the carpet body and outputs a temperature detection signal. This temperature detection signal is sent to both the first and second timer circuits 8 and 9.

The first timer circuit 8 receives the temperature detection signal from the temperature sensor 4 and compares the temperature of the carpet body with the first temperature T ₀ to determine whether the temperature of the carpet body is the first temperature.
The time to reach temperature T ₀ is measured. Then, the first timer circuit 8 sends the measured time t1 to the temperature correction circuit 10. When the temperature correction circuit 10 receives the time t1,
A correction signal for increasing or decreasing the target temperature Tm according to the time t1 is sent to the adder 6. In this case, the correction signal is
If the temperature of the carpet body is higher than the predetermined temperature or the room temperature is higher than the predetermined room temperature according to the formula (1), the target temperature Tm will be reduced, and the temperature of the carpet body will be lower than the predetermined temperature or the room temperature will be lower than the predetermined room temperature. If the temperature is too low, the target temperature Tm is increased.

Thus, the target temperature signal output from the target temperature setting circuit 5 is sent to the comparison circuit 7 as a signal of the target temperature T (t1) corrected by the correction signal in the adder 6. The comparison circuit 7 receives the signal of the target temperature T (t1) and the temperature detection signal from the temperature sensor 4 and inputs the target temperature T (t1).
The switching element 2 is turned on and off according to the temperature difference between 1) and the temperature of the carpet body. Thereby, the temperature of the carpet body increases toward the target temperature T (t1).
As a result, insufficient correction due to a difference between the initial temperature and the stable temperature and a change in the heat capacity of the carpet cover and the like, and overshoot are reduced.

Next, the second timer circuit 9 receives the temperature detection signal from the temperature sensor 4 and measures the time until the temperature of the carpet body reaches the target temperature T (t1). The time t2 is used as the third timer circuit. Send to 11 This third timer circuit 1
1 receives a time t2, and according to the time t2, the target temperature T
(T1) is gradually reduced to the target temperature Tm.
A correction signal which is obtained based on the equation (2) and becomes zero after this time F (t2) is sent to the temperature correction circuit 10. Thereby, the target temperature T (t1) becomes the target temperature Tm after the time F (t2) and is sent to the comparison circuit 7.

The comparison circuit 7 receives a signal that decreases from the target temperature T (t1) to the target temperature Tm and a temperature detection signal from the temperature sensor 4, and after a time F (t2), the target temperature Tm and the temperature of the carpet body. Switching element 2 according to the temperature difference between
On / off control. Thereafter, the temperature of the carpet body is controlled to be constant at the target temperature Tm.

[0025] In the embodiment thus, measures the time t1 the temperature of the carpet body has reached the first temperature T _0, and increase or decrease the target temperature Tm in accordance with the time t1 the target temperature T (t1) And the temperature of the carpet body is the target temperature T
(t1) is measured, and the target temperature T (t1) is sequentially changed to the target temperature Tm in accordance with the time t2.
2) Since the length is adjusted, the target temperature Tm at the time of energization according to the temperature of the carpet body, that is, the heat retention state of the carpet body, the heat radiation state, the change in the heat capacity due to the use of the carpet cover, etc. Can be corrected,
No overshoot of the carpet body temperature occurs at the start of energization. In addition, the temperature can be controlled to be stable without dropping after completion of the temperature correction.

The present invention is not limited to the above embodiment, but may be modified within the scope of the invention. For example, the target temperature set in the target temperature setting circuit 5 may set a maximum temperature and a minimum temperature. Further, the present invention can be applied not only to electric carpets but also to heating folds, electric blankets, electric kotatsu, and the like.

[0027]

As described above in detail, according to the present invention, it is possible to provide a temperature control device of a heating device which can control the temperature at the start of energization to a stable state without overshooting and temperature drop.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a temperature control device for a heating device according to the present invention.

FIG. 2 is a view showing the operation of temperature control of the apparatus.

[Explanation of symbols]

2 switching element, 3 heater wire, 4 temperature sensor, 5 target temperature setting circuit, 6 adder, 7 comparison circuit, 8 first timer circuit, 9 second timer circuit, 10 ...
Temperature correction circuit, 11 ... third timer circuit.

Claims (1)

(57) [Scope of request for utility model registration] 1. A temperature sensor for detecting a temperature of a heating device such as an electric carpet, and a time when the temperature of the heating device detected by the temperature sensor reaches a preset first temperature is measured. A first correction circuit that corrects the target temperature in response thereto, and measures a time required for the temperature of the heating device to reach the corrected target temperature, and sequentially returns the corrected target temperature to the target temperature in accordance with the time. A second correction circuit for determining the length of time until the target temperature and sequentially changing the target temperature.