JP3296003B2 - Temperature control device - 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 electric heating appliances such as electric carpets and floor heaters.

[0002]

2. Description of the Related Art As shown in, for example, Japanese Patent Laying-Open No. 1-99111, this type of conventional temperature control device is as shown in FIGS. 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. A heat-sensitive heater wire 2 that contributes to warming and detects a temperature is wired in the electric carpet body 1, and the controller box 3 controls the surface temperature of the electric carpet body 1. FIG.
FIG. 3 is a perspective view of a partial configuration of the heat-sensitive heater wire 2. A polymer thermosensitive body 6 is interposed between the electrode wire 4 and the heating wire 5, and the electrode wire 4 and the heating wire 5 are spirally wound around a core thread 7 and covered with a skin 8.

FIG. 7 is a circuit diagram showing an example of a conventional temperature control device. AC power supply 9 and other circuits are switches 1
0 and a security circuit 11 composed of a thermal fuse are connected via a series circuit. A current is supplied via a diode 12 and a resistor 13 to a relay 14 which is power control means for controlling the conduction of the heating wire 5. 15 is a relay 14
Is a diode for absorbing a 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 denote a resistor thermally coupled to the thermal fuse 11, and the resistor 17 is used when the heating wire 5 is abnormally heated to melt the polymer thermosensitive body 6 and the electrode wire 4 and the heating wire 5 are short-circuited. Alternatively, a large current is applied to at least one of the switches 18 to operate the thermal fuse 11 to disconnect circuits other than the AC power supply 9 and the switch 10. The diodes 19 and 20 are for preventing a large current from flowing through the resistors 17 and 18 in a normal state.

[0004] Diodes 21, resistor 22, constant voltage diode 23, and the electrolytic capacitor 24 constitute a constant voltage circuit V _CC. Reference numeral 25 denotes a transistor whose base is grounded for temperature detection. Therefore, the current flowing through the emitter of the transistor 25 is substantially equal to the current flowing through the collector. The current I flowing through the polymer thermosensor 6 in the negative cycle of the AC power supply, that is, the current flowing through the emitter and the collector of the transistor 25 is expressed by the following equation. However, transistor 2
5 is V _{BE (25)} , 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 thermosensor 6 at a certain temperature T is Z (T), and the voltage of the AC power supply 9 is V _AC .

I = (V _AC −V _{BE (25)} −V _{F (20)} ) / (R ₍₁₈₎ + Z (T)) (1) V _AC ≫V _{BE (25)} , V _AC ≫ From VF ₍₂₀₎ and Z (T) ≫R ₍₁₈₎ , the expression (1) is as follows: 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.

[0006] The negative cycle of the AC source 9 current I flows through the constant voltage circuit V _CC than resistor 26, the temperature detection voltage V _T is obtained as the output signal of the temperature detecting means 28 is smoothed by the capacitor 27 Can be Resistance 29 and diode 3
0 constitutes a path for discharging the charge charged in the negative cycle of the AC power supply 9. Also, diodes 31 and 32
Is the current when the heating wire 5 is abnormally heated, the polymer thermosensitive body 6 is melted, and the electrode wire 4 and the heating wire 5 are short-circuited.
5 is for ensuring the energization of the resistor 18 even when an open failure occurs.

The diode 33, the resistor 34, and the capacitor 35 constitute a power supply for temperature setting means 39 including resistors 37, 37 and a volume 38.

[0008] 40 is a comparing means for comparing the temperature set voltage V _S is the output of the temperature detection voltage V _T and the temperature setting means 39 is the output of the temperature detecting means 28. Reference numeral 41 denotes a power supply synchronizing pulse generating means for generating a pulse synchronized with the AC power supply 9. Reference numeral 42 denotes a microcomputer as control means for turning on / off the transistor 16 as drive means based on the output signal of the comparison means 40. Reference numeral 43 denotes a timer which generates a certain period of time by counting the pulses of the power supply synchronizing pulse generator 41.

Further, a diode 44, a resistor 45, a diode 46, a constant voltage diode 47, and an electrolytic capacitor 4
8, diode 49, resistor 50, electrolytic capacitor 51,
A constant voltage power supply is constituted by a constant voltage diode 52 and supplied to the comparing means 40 and the microcomputer 42. 53
Is a reset circuit of the microcomputer 42, and 54 is a clock circuit.

The microcomputer 42 counts the number of pulses of the power supply synchronizing pulse generating means 41 by the timer means 43 after turning off the transistor 16 as the driving means,
Create a fixed period. While the transistor 16 is off, the relay 14 is off and the contact of the relay 14 is open, so that the polymer thermosensitive body 6 between the heating wire 5 and the electrode wire 4 is evenly distributed at any portion. The temperature of the entire heat-sensitive heater wire 2 is detected by an AC power supply 9.
The output V _T of the temperature sensing means 28 can be accurately detected by the transistor 25 which is the base grounded at the negative half cycle of. 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.
This is the time from when the ON request signal from the comparing means 40 arrives until it reaches a certain fixed period (T _TOTAL ). The time when the relay 14 is turned off (T _OFF ) is the time until the ON request signal comes from the comparing means 40, and T _OFF = T _TOTAL -T _ON .

When the volume 38 of the setting means 39 is changed, the time of T _OFF changes, and the time of T _ON within a certain fixed period (T _TOTAL ) changes. Temperature. That is, when the set temperature is high, the duty ratio is high, and thus T _ON is long,
When the set temperature is low, the duty ratio is low, and thus T _ON is short. 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 at the same time.

FIGS. 9 and 10 show the state when the duty ratio is low.
Shown in FIG. 9 shows a 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 , if the set temperature is higher than the detected temperature at time t 1, the heating line 5 is turned on at time t _TO after T _TOTAL from time t 1.
2 (the temperature at time t1 is T0).

Therefore, the surface temperature of the carpet body 1 reaches a very high temperature T2. Next, from time t2 to t3
During this time, if the detected temperature does not fall below the set temperature, the heating wire 5 is kept off, and is kept off until an on-request signal is input to the microcomputer 42 after time t3. If an ON request signal is input at time t4, the heating wire 5 is turned on again from this point. Thereafter, turning off and on are repeated in the same manner. That is, the temperature differential ΔT, which is the difference (T2−T0) between the point where the temperature is the highest and the point where the temperature is controlled at a constant temperature, is large, which makes the carpet extremely uncomfortable.

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 energized (the temperature at time t1 _R and T0 _R). Therefore, the surface temperature of the carpet body 1 reaches a very high temperature T2 _R.
Next, at time t2 the heating wire 5 if not the detected temperature is below the set temperature during the period from _R t3 _R maintains the off time t
3 since _R to ON request signal is inputted to the microcomputer 42 further kept off. If at time t4 _R ON request signal has been input is turned on again heating wire 5 from this point. Thereafter, turning off and on are repeated in the same manner. That is, the temperature differential ΔT _R, which is the difference (T2 _R −T0 _R ) between the highest point and the lowest point when the temperature is controlled at a constant temperature, is large, which is extremely uncomfortable when using a carpet.

[0015]

However, the conventional configuration as described above has the following problems. (1) off → on of the heating wire is made by on-request signal comparison means on the basis of V _T, which is the output of the temperature detection means, on → off simply periodic by counting of the timer means (T _TOTAL) Therefore, there is a problem in that the continuous on time (T _ON ) is too long and the surface temperature of the carpet is too high, giving the user discomfort. This phenomenon is likely to occur when the _duty ratio is low and there is no ON within one fixed period (T _TOTAL ). That is,
(A) when the set temperature is low, and (b) when the room temperature is close to the set temperature.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problem, and to provide a temperature control that is comfortable even when the set temperature is low by reducing the temperature differential.

Still another object of the present invention is to reduce the temperature differential and perform comfortable temperature control even when the set temperature is close to room temperature.

[0018]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a heat-sensitive heater wire having a polymer thermosensitive element interposed between a heat-generating wire and an electrode wire, and controls the energization of the heat-generating wire. Power control means, a temperature detection means for detecting a temperature signal current flowing through the polymer thermosensor via the electrode wire, a temperature setting means for setting the thermosensitive heater wire to a desired temperature, and the temperature detection Comparison means for comparing the output signal of the means with the output signal of the temperature setting means; a driving means for driving the power control means; and a signal for forcibly driving or stopping the driving means at a certain fixed period. Timer means for outputting and restarting, a correction means for correcting a fixed period of the timer means in accordance with the set temperature of the temperature setting means, and an output of the timer means and a small amount of time when the driving means is being driven or stopped. Ku even which is constituted by a control means for stopping or driving the drive means based on a signal either of the comparison means.

Also, a heat-sensitive heater wire having a polymer thermosensitive material interposed between the heating wire and the electrode wire, power control means for controlling the energization of the heat-generating wire, and a temperature flowing through the polymer thermosensitive material temperature detecting means for detecting the signal current through the electrode line, a temperature setting device for setting the thermal heater wire to the desired temperature, the output signal of said temperature detecting means and the temperature setting hand <br/> stage A comparing unit that compares an output signal, a driving unit that drives the power control unit, and a timer unit that outputs a signal for forcibly driving or stopping the driving unit at a certain fixed period and restarts the signal. A room temperature detecting means for detecting a room temperature, a correcting means for correcting a fixed period of the timer means according to a difference between a set temperature of the temperature setting means and a detected temperature of the room temperature detecting means, an output of the timer means and Driving hand Based on the signals of at least one of the comparison means being driven or stopped which is constituted by a control means for stopping or driving the drive means.

[0020]

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

Further, by correcting the fixed period of the timer when the temperature is close to the set temperature and the room temperature, the continuous ON time of the heating wire can be shortened, and the temperature differential of the surface temperature can be reduced.

[0022]

FIG. 1 is a block diagram of a temperature control device showing one embodiment of the present invention. 4 to 8 are the same as those in FIG. 4 to FIG.

The heating wire 5 is connected in series with an AC power supply 9 and a relay 14 as power control means which is turned on and off by a transistor 16 as driving means.
Temperature setting voltage V a current flowing through the polymer temperature sensitive body 6 interposed an output of the temperature detection voltage V _T and the temperature setting means 39 is the output signal of the temperature detecting means 28 for converting the voltage between the
_S is compared by the comparing means 40, and when the detected temperature is lower than the set temperature, an ON request signal is output to the control means 42. Reference numeral 55 denotes a correction unit that determines a correction amount for correcting T _TOTAL of the timer unit 43 based on the temperature setting voltage V _S output from the temperature setting unit 39, and outputs the correction amount to the timer unit 43. The control means 42 turns on / off the driving means 16 in the following manner based on the signal from the comparing means 40 and the signal from the timer means 43.

FIG. 2A shows a state of control at a fixed period when the set temperature is high, and FIG. 2B shows a state of control at a fixed period when the set temperature is low. If the fixed cycle when the set temperature is high is T _{TOTAL (H)} , the off period of the heating wire 5 is T _{OFF (H)} , and the on period of the heating wire 5 is T _{ON (H )} , 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 T shorter than T _{TOTAL (H)
TOTAL (L),} and 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. 2C shows a state where the fixed period is T _{TOTAL (H)} when the set temperature is low. This is a rewritten version of FIG. 9 illustrating the conventional example so as to be easily compared. Assuming that the first on time t _a ′ is equal to t _a , the next off time t _b ′ is 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
2c2 relationship between differential [Delta] T _b when -T _2c0 and the set temperature constant period is shortened when low [Delta] T _b <[Delta] T
_c , and the temperature differential becomes smaller when the fixed period is shortened. Further, the time t _d ′ between the second ON and the third ON is longer than t _d when the fixed period is shortened, and the user using the carpet is energized or de-energized to the heating wire 5. This makes the user feel energized and gives a sense of discomfort. That is, by correcting the fixed period according to the set temperature, the sense of discomfort can be reduced.

Next, another embodiment will be described. FIG. 3 is a configuration diagram of a temperature control device showing one embodiment of the present invention. 5 to 9
The same reference numerals denote the same components, and a description thereof will be omitted.

The heating wire 5 is connected in series with the AC power supply 9 and the relay 14 as power control means which is turned on and off by the transistor 16 as driving means.
Temperature setting voltage V a current flowing through the polymer temperature sensitive body 6 interposed an output of the temperature detection voltage V _T and the temperature setting means 39 is the output signal of the temperature detecting means 28 for converting the voltage between the
_S is compared by the comparing means 40, and when the detected temperature is lower than the set temperature, an ON request signal is output to the control means 42. 55 is a correction means which receives a temperature setting voltage V _S output from the temperature setting means 39 and an output signal of the room temperature detecting means 55, determines a correction amount to be corrected according to the difference between the set temperature and the detected room temperature, and sets 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 based on the signal from the comparing means 40 and the signal from the timer means 43.

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

When the difference between the set temperature and room temperature is large, the fixed period is T _{TOTAL (H) R} , the off period of the heating wire 5 is T _{OFF (H) R} , and the on period of the heating wire 5 is T _{ON ( H)} becomes as _R Tosureba FIG surface temperature of the carpet body 1 at which the heating cable 5 is turned on T _2A0R, the surface temperature of the carpet body 1 at which the heating cable 5 is turned off becomes _T 2a1R. Thus, when the difference between the set temperature and the room temperature is large, the temperature differential also operates stably. Next, the fixed period when the difference between the set temperature and the room temperature is small is set to T shorter than T _{TOTAL (H) R.
TOTAL ( L) R} , the first ON time of the heating wire 5 is t _aR , and the time from the end of the first ON to the next ON is t.
_bR , the next on time is t _cR , the next off time is 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. 4C shows the difference between the set temperature and the room temperature.
Is smaller when_{TOTAL (H) R}The situation when
Show. This is easy to compare with FIG. 10 which describes the conventional example.
It has been rewritten as follows. First ON time t_a’
_RIs t_aRIs equal to the next off time t_b’_RIs t
_b’_R= T_bRBecomes However, T_{TOTAL (L) R}<T
_{TOTAL (H) R}, 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_2b1RAt the start of the second ON
Surface temperature T_2c0RIs T_2c0R= T_2b0RBut the second time
Finished surface temperature T_2c2RIs T_2b2R<T_2c2RNext surface temperature
Degree of differential ΔT_cRT_2c2R-T_2c0RAnd set
When the difference between the constant temperature and room temperature was small, the fixed period was shortened.
Mushroom differential ΔT_bRIs ΔT_bR<ΔT_cR
The shorter the fixed period, the more the temperature differential
Become smaller. In addition, between the second on and the third on
Time t_d’_RIs t when the fixed period is shortened_dRLonger than
To the heating wire 5 for the user using the carpet.
It will make you feel energized and de-energized, giving
And That is, a fixed period is set according to the difference between the set temperature and room temperature.
Correction can alleviate discomfort.

In the above two embodiments, the time when the heating wire 5 changes from off to on is given priority by the output signal of the comparing means 40, and from on to off is performed by the output signal of the timer means 43. The same effect can be obtained when the output signal of the comparing means 40 turns off the output signal and the output signal of the timer means 43 turns on the output signal.

[0032]

As described above, according to the structure of the present invention, the following effects can be obtained. 1) correction means for correcting the fixed period of the timer means in accordance with the set temperature of the temperature setting means, and an output of the timer means and a signal of at least one of the driving means and the driving means or a stop signal. By providing a control means for stopping or driving the driving means based on the temperature, a constant period is corrected in accordance with the set temperature, so that the continuous ON or OFF time is limited to a short time, thereby reducing the temperature differential. Thus, it is possible to provide a temperature control device in which a feeling of strangeness is reduced. 2) correction means for correcting the fixed period of the timer means in accordance with the difference between the temperature set by the temperature setting means and room temperature, and comparison between the output of the timer means and at least one of the drive means being driven or stopped. By providing control means for stopping or driving the driving means based on the signal of the means, the period of continuous ON or OFF is shortened by correcting the fixed period according to the difference between the set temperature and the room temperature. Thus, a temperature control device can be provided in which the temperature differential can be suppressed to be small and the sense of incongruity can be alleviated.

[Brief description of the 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 according to 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 according to 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 perspective view of a partial configuration of a 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 a temperature control method in a conventional temperature control device is used when a set temperature is low.

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

[Explanation of symbols]

 2 Heat-sensitive heater wire 4 Electrode wire 5 Heating wire 6 Polymer thermosensor 9 AC power supply 14 Power control means 16 Driving means 28 Temperature detection means 39 Temperature setting means 40 Comparison means 42 Control means 43 Timer means 55 Correction means 56 Room temperature detection means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-205217 (JP, A) JP-A-4-324086 (JP, A) JP-A-2-50721 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G05D 23/00-23/32 F24D 13/00-15/04

Claims (2)

(57) [Claims] 1. A heat-sensitive heater wire having a polymer thermosensitive material interposed between a heating wire and an electrode wire; a power control means for controlling energization of the heating wire; and a temperature flowing through the polymer thermosensitive material. 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; comparison means for comparing an output signal of the temperature detection means with an output signal of the temperature setting means; a driving means for driving the power control means; Timer means for outputting a signal for forcibly driving or stopping the driving means at a certain fixed cycle and restarting the same, and correction for correcting the fixed cycle of the timer means according to the set temperature of the temperature setting means. And a 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 during driving or stopping the driving means . 2. A heat-sensitive heater wire having a polymer thermosensitive material interposed between a heating wire and an electrode wire; a power control means for controlling energization of the heating wire; and a temperature flowing through the polymer thermosensitive material. 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; comparison means for comparing an output signal of the temperature detection means with an output signal of the temperature setting means; a driving means for driving the power control means; Timer means for outputting a signal for forcibly driving or stopping at least one of the driving means at a fixed period and restarting the operation, room temperature detecting means for detecting room temperature, and the temperature setting means A correction means for correcting the temperature in accordance with the difference between the set temperature and the detection temperature of the room temperature detection means, and a drive based on an output of the timer means and a signal of at least one of the comparison means during driving or stopping of the driving means. A temperature control device comprising control means for stopping or driving the means .