JPH06242841A - Temperature control device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a comfortable temperature control by reducing the temperature differential when the set temperature is low or when the difference between the set temperature and room temperature is small. [Structure] The constant period of the timer means 43 is set to the temperature setting means 39
The correction means 55 for correcting the driving means 16 according to the set temperature, the output of the timer means 43, and the signal from at least one of the comparison means 40 that is driving or stopping the driving means, stop or drive the driving means 16. The control means 42 for driving controls the energization of the heat generating wire 5, the electrode wire 4, and the heat sensitive heater wire composed of the polymer temperature sensitive body 6 to the heat generating wire 5. When the set temperature is low, the constant period of the timer means 43 is corrected to shorten the continuous ON time of the heating wire 5 and reduce the differential of the surface temperature.

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 electric heating appliances such as electric carpets and floor heating.

[0002]

2. Description of the Related Art A conventional temperature control device of this type has a structure as shown in FIGS. 5 to 7, for example, as disclosed in Japanese Patent Laid-Open No. 1-99111. FIG. 5: is a block diagram of the electric carpet which is an example of the electric heating appliance using the conventional temperature control apparatus. A heat sensitive heater wire 2 that contributes to heating and detects the temperature is wired in the electric carpet body 1, and the controller box 3 controls the surface temperature of the electric carpet body 1. Figure 6
FIG. 4 is a partial perspective view of the heat-sensitive heater wire 2. A polymer temperature sensitive body 6 is interposed between the electrode wire 4 and the heating wire 5, and the core wire 7 is wound around the electrode wire 4 and the heating wire 5 in a spiral shape and covered with an outer cover 8.

FIG. 7 is a circuit diagram showing an example of a conventional temperature control device. Switch 1 for AC power supply 9 and other circuits
0 and a safety circuit 11 composed of a thermal fuse are connected via a series circuit. Through the diode 12 and the resistor 13, a current is supplied to the relay 14, which is a power control means for controlling the energization of the heating wire 5. 15 is a relay 14
Is a diode for absorbing back electromotive force. 16 is relay 1
4 is a transistor that is a driving unit for driving the transistor 4. Reference numerals 17 and 18 are resistances thermally coupled to the thermal fuse 11, and when the heating wire 5 is abnormally heated to melt the polymer temperature sensitive body 6 and the electrode wire 4 and the heating wire 5 are short-circuited, the resistance 17 Alternatively, a large current is supplied to at least one of the switches 18 to operate the temperature fuse 11 to disconnect the circuits other than the AC power supply 9 and the switch 10. The diodes 19 and 20 prevent a large current from flowing through the resistors 17 and 18 at normal times.

The diode 21, resistor 22, constant voltage diode 23, and electrolytic capacitor 24 constitute a constant voltage circuit V _CC . Reference numeral 25 is a base-grounded transistor for temperature detection. Therefore, the current flowing through the emitter of the transistor 25 is substantially equal to the current flowing through the collector. In addition, the current I flowing through the polymer temperature sensitive body 6 in the negative cycle of the AC power supply, that is, the current flowing through the emitter and collector of the transistor 25 is expressed by the following equation. However, transistor 2
The base-emitter voltage of 5 is V _{BE (25)} and the diode 2
The forward voltage of 0 is V _{F (20)} , the resistance value of the resistor 18 is R ₍₁₈₎ , the impedance of the polymer temperature sensor 6 at a certain temperature T is Z (T), and the voltage of the AC power source 9 is V (V). _AC .

[0005] _{I = (V AC -V BE (} 25) -V F (20)) / (R (18) + Z (T)) ··· (1) V AC »V BE (25), V AC » V _{F (20),} equation (1) Z (T) >> R ₍₁₈₎ becomes _{I = V AC / Z (T} ) ··· (2). That is, the current flowing through the collector of the transistor 25 corresponds to the temperature of the carpet.

In the negative cycle of the AC power supply 9, the current I flows from the constant voltage circuit V _CC through the resistor 26, is smoothed by the capacitor 27, and the temperature detection voltage V _T which is the output signal of the temperature detection means 28 is obtained. To be Resistor 29 and diode 3
0 constitutes a path for discharging the electric charge charged in the negative cycle of the AC power supply 9. Also, the diodes 31 and 32
Is an electric current generated when the heating wire 5 is abnormally heated and the polymer temperature sensitive body 6 is melted and the electrode wire 4 and the heating wire 5 are short-circuited.
This is for ensuring the energization of the resistor 18 even when 5 has an open failure.

The diode 33, the resistor 34, and the capacitor 35 constitute the power source of the temperature setting means 39 consisting of the resistors 37 and 37 and the volume 38.

Reference numeral 40 is a comparison means for comparing the temperature detection voltage V _T which is the output of the temperature detection means 28 with the temperature setting voltage V _S which is the output of the temperature setting means 39. Reference numeral 41 is a power supply synchronization pulse generation means for generating a pulse synchronized with the AC power supply 9. Reference numeral 42 is a microcomputer which is a control means for turning on / off the transistor 16 which is a drive means based on the output signal of the comparison means 40. Reference numeral 43 is a timer means for creating a certain period of time by counting the pulses of the power supply synchronizing pulse generating means 41.

Further, the diode 44, the resistor 45, the diode 46, the constant voltage diode 47, the electrolytic capacitor 4
8, diode 49, resistor 50, electrolytic capacitor 51,
The constant voltage diode 52 constitutes a constant voltage power supply and supplies it to the comparison means 40 and the microcomputer 42. 53
Is a reset circuit of the microcomputer 42, and 54 is a clock circuit.

The microcomputer 42 turns off the transistor 16 which is the driving means, and then counts the number of pulses of the power supply synchronizing pulse generating means 41 with the timer means 43,
Create a fixed period. While the transistor 16 is off, the relay 14 is off, and the contact of the relay 14 is open. Therefore, the polymer temperature sensor 6 between the heating wire 5 and the electrode wire 4 is evenly distributed in any part. The temperature of the entire heat sensitive heater wire 2 is detected by the AC power supply 9
In the negative half cycle of, the transistor 25 whose base is grounded can be accurately detected and becomes the output V _T of the temperature detecting means 28. And the V _T, compares the output V _S of the setting means 39 in the comparison unit 40, if lower than the set temperature of the detected temperature is setting means of the temperature detecting means (V _T> V _S), comparing means 40 of the relay 14 An on request signal is generated and the result is input to the microcomputer 42. Microcomputer 4
2 immediately drives the transistor 16 and the relay 14
Is turned on and the heating wire 5 is energized. Here, the time (T _ON ) during which the heating wire 5 is energized is as shown in FIG.
It is the time until it reaches a certain fixed period (T _TOTAL ) after the ON request signal from the comparison means 40 arrives. The time when the relay 14 is turned off (T _OFF ) is the time until the ON request signal comes from the comparison means 40, and T _OFF = T _TOTAL −T _ON .

When the volume 38 of the setting means 39 is changed, the T _OFF time is changed, and the T _ON time is changed within a certain fixed period (T _TOTAL ), so that the duty factor of the heating wire 5 is changed. To get the temperature of. That is, when the set temperature is high, the duty factor is high, and therefore T _ON is long,
When the set temperature is low, the duty ratio is low and therefore T _ON is short. Further, the timer means 43 is provided in the microcomputer 42 and counts a fixed period (T _TOTAL ).
At the time when _{TOTAL has} elapsed, the microcomputer 42 turns off the transistor 16 and restarts it at the same time.

9 and 10 show the state when the duty ratio is low.
Shown in. FIG. 9 shows the state when the set temperature is low. When the duty ratio is low and the first off period T _OFF1 is longer than T _TOTAL , at time t1, if the set temperature is higher than the detected temperature, the heating wire 5 starts at time t1 at which time T _TOTAL elapses.
Power is supplied up to 2 (T0 is the temperature at time t1).

Therefore, the surface temperature of the carpet body 1 reaches a very high temperature T2. Next, from time t2 to t3
If the detected temperature does not fall below the set temperature during the period, the heating line 5 is kept off, and is further kept off until the on request signal is input to the microcomputer 42 after the time t3. If the on request signal is input at time t4, the heating wire 5 is turned on again from this time point. After that, similarly, OFF and ON are repeated. That is, the temperature differential ΔT, which is the difference (T2-T0) between the highest point and the lowest point when the temperature is controlled at a constant temperature, is large, which is very uncomfortable when using the carpet.

Further, FIG. 10 shows a state where the set temperature is high but close to room temperature. If the time t1 the _R set temperature when duty ratio is low initially off period T _OFF1R is longer than T _TOTAL is higher than the detected temperature t1 heating wire 5 from the time of the _R until the time t2 _R where T _TOTALR elapses Energize (temperature at time t1 _R is T0 _R ). Therefore, the surface temperature of the carpet body 1 reaches a very high temperature T2 _R.
Next, between the time t2 _R and the time t3 _R , if the detected temperature does not fall below the set temperature, the heating wire 5 is kept off, and the time t
After 3 _{R, the} off state is further maintained until the on request signal is input to the microcomputer 42. If the on request signal is input at time t4 _R , the heating wire 5 is turned on again from this point. After that, similarly, OFF and ON are repeated. That is, when the temperature is controlled at a constant temperature, the temperature differential ΔT _R, which is the difference (T2 _R −T0 _R ) between the highest temperature and the lowest temperature, is large, which is very uncomfortable when the carpet is used.

[0015]

However, the conventional structure as described above has the following problems. (1) The heat-off line is turned off → on by a turn-on request signal of the comparison means based on the output V _T of the temperature detection means, but on-off is simply a constant period (T _TOTAL ) counted by the timer means. Therefore, there is a problem that the time for which the carpet is continuously turned on (T _ON ) is too long and the surface temperature of the carpet rises too much, which gives the user an unpleasant feeling. This phenomenon is likely to occur when the _duty factor is low and the power is not turned on within one constant period (T _TOTAL ). That is,
(A) When the set temperature is low, (b) When the set temperature is close to room temperature.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a comfortable temperature control by reducing the temperature differential even when the set temperature is low.

Further, it is an object of the present invention to reduce the temperature differential even when the set temperature is close to the room temperature to provide comfortable temperature control.

[0018]

In order to achieve the above-mentioned object, the present invention controls a heat sensitive heater wire having a polymer temperature sensing element interposed between a heat generating wire and an electrode wire, and energization of the heat generating wire. Power control means, temperature detection means for detecting a temperature signal current flowing through the polymer temperature sensor via the electrode wire, temperature setting means for setting the heat sensitive heater wire to a desired temperature, and the temperature detection means. Comparing means for comparing the output signal of the means with the temperature output signal, driving means for driving the power control means, and a signal for forcibly driving or stopping the driving means at a certain fixed period. The timer means for restarting and restarting, the timer correcting means for correcting the constant cycle of the timer means according to the set temperature of the temperature setting means, the output of the timer means and the driving means driving or stopping Also stop or drive means based on a signal either of the comparison means which is constituted by a control means for driving.

Further, a heat sensitive heater wire having a polymer temperature sensor interposed between the heat generating wire and the electrode wire, an electric power control means for controlling energization of the heat generating wire, and a temperature flowing through the polymer temperature sensor. Temperature detecting means for detecting a signal current through the electrode wire, temperature setting means for setting the heat sensitive heater wire to a desired temperature, and comparing means for comparing the output signal of the temperature detecting means with the temperature output signal, Driving means for driving the electric power control means, timer means for outputting a signal for forcibly driving and / or stopping the driving means at a certain fixed period and restarting, and room temperature detecting means for detecting room temperature. And timer correction means for correcting the constant period of the timer means according to the difference between the set temperature of the temperature setting means and the detected temperature of the room temperature detecting means, the output of the timer means and the driving means driving center block. Stop or driving means on the basis of the signal of at least one of the comparison means in the stop which is constituted by a control means for driving.

[0020]

According to the present invention, by correcting the constant period of the timer means when the set temperature is low, the continuous ON time of the heating wire can be shortened and the temperature differential of the surface temperature can be reduced.

Further, by correcting the constant period of the timer means when the set temperature is close to the room temperature, it is possible to shorten the continuous ON time of the heating wire and reduce the temperature differential of the surface temperature.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a temperature control device showing an embodiment of the present invention. The same reference numerals as those in FIGS. 4 to 8 are the same and therefore the description thereof will be omitted.

An AC power source 9 is connected in series with a heating wire 5 and a relay 14 which is a power control means which is turned on and off by a transistor 16 which is a driving means, and the heating wire 5 and the electrode wire 4 are connected.
Temperature detection voltage V _T , which is the output signal of the temperature detection means 28 for converting the current flowing in the polymer temperature sensitive body 6 interposed between the temperature detection means 28 and the temperature setting voltage V, which is the output of the temperature setting means 39.
_The comparison means 40 compares _S with each other, and when the detected temperature is lower than the set temperature, the ON request signal is output to the control means 42. Reference numeral 55 denotes a correction means, which is a correction means for determining a correction amount for correcting T _TOTAL of the timer means 43 according to the temperature setting voltage V _S output from the temperature setting means 39 and outputting the correction amount to the timer means 43. The control means 42 turns on / off the driving means 16 in the following manner according to the signal from the comparing means 40 and the signal from the timer means 43.

FIG. 2A shows the state of control at a constant cycle when the set temperature is high, and FIG. 2B shows the state of control at a constant cycle when the set temperature is low. If the fixed cycle when the set temperature is high is T _{TOTAL (H)} , the period when the heating wire 5 is off is T _{OFF (H)} , and the period when the heating wire 5 is on is T _{ON (H )} , the result becomes as shown in the figure. ,
The surface temperature of the carpet body 1 when the heating wire 5 is turned on is T _2a0 , and the carpet body 1 when the heating wire 5 is turned off
_Has a surface temperature of T _2a1 . Thus, when the set temperature is high, the temperature differential also operates stably. next,
The fixed cycle when the set temperature is low is shorter than T _{TOTAL (H)} T
_{TOTAL (L)} , the first ON time of the heating wire 5 is t _a ,
The time from the end of the first time on until the next on t _b, time t _c of the next on, the surface temperature T _2b1, t _b when the time of the next off t _d, t _a is started the surface temperature when the surface temperature at the time of completion _T 2b0, t _c is finished T _2b2
If T _2b2> T _2b1, and the temperature differential [Delta] T _b becomes _{ΔT b} = T _2b2 -T 2b0.

Next, FIG. 2 (c) shows a state where the fixed period is T _{TOTAL (H)} when the set temperature is low. This is a rewrite of FIG. 9 for explaining the conventional example for easy comparison. 'If equals t _a next time t _b off' first on-time t _a is the t _b '= t _b. However, since T _{TOTAL (L)} <T _{TOTAL (H)} , the next on-time t _c 'is tc <tc'. Therefore, the surface temperature T _2c1 at the end of the first ON is T _2c1 = T _2b1 and the surface temperature T _2c0 at the start of the second ON is T _2c0 = T _2b0 , but the surface temperature at the end of the second _ON T _2c2 is T _2b2 <T
_2c2 , which is the surface temperature differential ΔT _c , T
_{The relationship} between _2c2 - _T2c0 and the differential ΔT _b when the constant period is shortened when the set temperature is low is ΔT _b <ΔT
_c , and the temperature differential becomes smaller when the fixed period is shortened. Further, the time t _d 'between the second turn-on and the third turn-on becomes longer than the time t _d when the fixed cycle is shortened, so that the user using the carpet is not energized to the heating wire 5 or not. It makes you feel energized and gives you a feeling of strangeness. That is, the sense of incongruity can be alleviated by correcting the constant period according to the set temperature.

Next, another embodiment will be described. FIG. 3 is a block diagram of a temperature control device showing an embodiment of the present invention. 5 to 9
The same reference numerals as those in FIG.

An exothermic line 5 and a relay 14, which is a power control unit that is turned on and off by a transistor 16 that is a driving unit, are connected in series to an AC power source 9, and the exothermic line 5 and the electrode line 4 are connected.
Temperature detection voltage V _T , which is the output signal of the temperature detection means 28 for converting the current flowing in the polymer temperature sensitive body 6 interposed between the temperature detection means 28 and the temperature setting voltage V, which is the output of the temperature setting means 39.
_The comparison means 40 compares _S with each other, and when the detected temperature is lower than the set temperature, the ON request signal is output to the control means 42. Reference numeral 55 denotes a correction means, which inputs a temperature setting voltage V _S output from the temperature setting means 39 and an output signal of the room temperature detecting means 55 to determine a correction amount to be corrected according to the difference between the set temperature and the detected room temperature, and a timer. The correction means outputs the correction amount to the means 43. The control means 42 turns on / off the driving means 16 in the following manner according to the signal from the comparing means 40 and the signal from the timer means 43.

FIG. 4A shows a state of control at a constant cycle when the difference between the set temperature and room temperature is large, and FIG. 4B shows a control at the constant cycle when the difference between the set temperature and room temperature is small. The situation is shown.

When the difference between the set temperature and the room temperature is large, the fixed period is T _{TOTAL (H) R} , the period when the heating wire 5 is off is T _{OFF (H) R} , and the period when the heating wire 5 is on is T _{ON ( If H) R} is _obtained , the surface temperature of the carpet body 1 when the heating wire 5 is turned on is T _2a0R, and the surface temperature of the carpet body 1 when the heating wire 5 is turned off is T _2a1R . In this way, when the difference between the set temperature and the room temperature is large, the temperature differential also operates stably. Next, the constant cycle when the difference between the set temperature and room temperature is small is T shorter than T _{TOTAL (H) R.
Let TOTAL ( L) R} be the time the first ON of the heating wire 5 is t _aR , and the time from the end of the first ON to the next ON.
_bR , next on time t _cR , next off time t _dR , t
The surface temperature at the time _{of aR} begins _T 2b1R, the surface temperature at the time of t _bR is finished _T 2b0R, if the surface temperature at the time of t _cR has been completed and _T 2b2R T 2b2R> T 2b1R, and the temperature differential ΔT _bR Is ΔT _bR = T _2b2R −T _2b0R .

Next, FIG. 4 (c) shows the difference between the set temperature and the room temperature.
When T is small, the fixed period is T_{TOTAL (H) R}The situation when
Show. This is easy to compare with FIG. 10 which explains the conventional example.
It was rewritten as follows. First on time t_a’
_RIs t_aRAnd the next off-time t_b’_RIs t
_b’_R= T_bRBecomes However, T_{TOTAL (L) R}<T
_{TOTAL (H) R}Therefore, the next on time t_c’_RIs t_cR
<T_c’_RBecomes Therefore, the surface at the end of the first ON
Temperature T_2c1RIs T_2c1R= T_2b1RAnd at the start of the second ON
Surface temperature T_2c0RIs T_2c0R= T_2b0RBut the second time
Surface temperature T at the end_2c2RIs T_2b2R<T_2c2RNext surface temperature
Degree differential ΔT_cRIs T_2c2R-T_2c0RAnd setting
If the constant cycle is shortened when the difference between the constant temperature and room temperature is small,
Kino differential ΔT_bRRelationship with ΔT_bR<ΔT_cR
Therefore, the temperature differential is better if the fixed cycle is shortened.
Get smaller. Furthermore, from the second on to the third on
Time t_d’_RIs t when the fixed cycle is shortened_dRLonger than
To the heating wire 5 to the user using the carpet
It may make you feel energized or de-energized, which may make you feel uncomfortable.
And That is, a fixed cycle is set according to the difference between the set temperature and the room temperature.
The correction can alleviate the discomfort.

In the above two embodiments, the output signal of the comparison means 40 is prioritized at the time when the heating wire 5 changes from off to on and the output signal of the timer means 43 is used to switch from on to off. Even when the output signal of the comparison means 40 is used for turning off and the output signal of the timer means 43 is used for turning on from off, the same effect can be obtained.

[0032]

As described above, according to the configuration of the present invention, the following effects can be obtained. 1) The signal of the correction means for correcting the constant period of the timer means according to the set temperature of the temperature setting means, and the output of the timer means and the signal of at least one of the comparing means that is driving or stopping the driving means. By providing a control means for stopping or driving the driving means based on this, by correcting the constant period according to the set temperature, the continuous on or off time is limited to a short time, and the temperature differential is suppressed to a small value. It is possible to provide a temperature control device which can alleviate discomfort. 2) A comparison between a correction unit that corrects the constant period of the timer unit according to the difference between the set temperature of the temperature setting unit and the room temperature, and at least one of the output of the timer unit and the driving or stopping of the driving unit. By providing a control means for stopping or driving the driving means based on the signal of the means, by correcting the constant period according to the difference between the set temperature and the room temperature, the continuous on or off time is limited to a short time. Therefore, it is possible to provide a temperature control device in which the temperature differential can be suppressed to be small and the discomfort is alleviated.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a temperature control device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a temperature control method in the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a temperature control device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a temperature control method in a second embodiment of the present invention.

FIG. 5 is a configuration diagram of an electric carpet which is an example of an electric heating appliance using a conventional temperature control device.

FIG. 6 is a partial perspective view of the heat-sensitive heater wire.

FIG. 7 is a circuit diagram showing an example of a conventional temperature control device.

FIG. 8 is a diagram showing a temperature control method in a conventional temperature control device.

FIG. 9 is a diagram showing a state when the temperature control method in the conventional temperature control device is used when the set temperature is low.

FIG. 10 is a diagram showing a state when the temperature control method in the conventional temperature control device is used when the set temperature is close to the room temperature.

[Explanation of symbols]

 2 Heat Sensitive Heater Wire 4 Electrode Wire 5 Heat Generation Wire 6 Polymer Thermosensitive Body 9 AC Power Supply 14 Power Control Means 16 Driving Means 28 Temperature Detecting Means 39 Temperature Setting Means 40 Comparing Means 42 Control Means 43 Timer Means 55 Correcting Means 56 Room Temperature Detecting Means

Claims (2)

[Claims] 1. A heat-sensitive heater wire having a polymer temperature sensitive body interposed between a heat generating wire and an electrode wire, an electric power control means for controlling energization of the heat generating wire, and a temperature flowing through the polymer temperature sensitive body. Temperature detection means for detecting a signal current through the electrode wire,
Temperature setting means for setting the heat sensitive heater wire to a desired temperature, comparing means for comparing an output signal of the temperature detecting means and an output signal of the temperature detecting means, driving means for driving the power control means, and A timer means for outputting a signal for forcibly driving and / or stopping the driving means at a certain fixed cycle and restarting it, and correcting the fixed cycle of the timer means according to the set temperature of the temperature setting means. Temperature control means comprising correction means and control means for stopping or driving the driving means based on an output of the timer means and a signal from at least one of the comparing means that is driving or stopping the driving means. 2. A heat sensitive heater wire comprising a polymer temperature sensitive body interposed between a heat generating wire and an electrode wire, an electric power control means for controlling energization of the heat generating wire, and a temperature flowing through the polymer temperature sensitive body. Temperature detection means for detecting a signal current through the electrode wire,
Temperature setting means for setting the heat sensitive heater wire to a desired temperature, comparing means for comparing an output signal of the temperature detecting means and an output signal of the temperature detecting means, driving means for driving the power control means, and Timer means for outputting and restarting a signal for forcibly driving or stopping driving means at a certain fixed cycle, room temperature detecting means for detecting room temperature, and fixed cycle of the timer means for setting the temperature. Based on the signal of the correction means for correcting according to the difference between the set temperature of the means and the detected temperature of the room temperature detection means, the output of the timer means and the comparison means of at least one of the driving means being driven and stopped. Temperature control means including control means for stopping or driving the driving means by means of the temperature control means.