JPH01304680A - Temperature controlling device for electric heating instrument - Google Patents

Abstract

PURPOSE:To conduct electric current only in a prescribed period when heating is necessary by installing a timer system to cease the electric current after a prescribed time since an operation including temperature setting is carried out. CONSTITUTION:Heating wires 101, 102 and temperature sensing wires 103, 104 are distributively installed on both side of an electric carpet main body 100, and each temperature signal voltage Vt detected through temperature sensitive resin 116, 125 and temperature setting voltage Vs from an electricity source 106 are compared each other by comparing devices 138, 139 so as to control the temperature of the carpet. A timer motive part 173 motived every time when a temperature setting operation is carried out is installed and a timer controlling part 174 operated by a signal from the time motive part put out a signal to cease electric current after a prescribed period since the start. When a electric current conduction is needed for a long period, a timer off switch 175 is opened and the timer motive part 173 is stopped.

Description

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

Conventional technology The conventional electric carpet will be explained below.

Figure 3 shows the main body configuration diagram of a conventional electric carpet.1
is an electric carpet main body, which is a so-called two-wire type electric carpet in which a temperature sensitive wire 2 that detects the surface temperature and a string-shaped heating element 3 that contributes to heat collection are wired separately in the main body 1. This is an example. 4 is a controller box that controls the surface temperature of the electric carpet body 1.

FIG. 4 is a partially cutaway perspective view showing the configuration of the temperature-sensitive wire 2, in which a pair of first electrode wires 5, 6 and a temperature-thermosensitive resin 7 filled between them and whose impedance changes depending on the temperature are integrally constructed. has been done. 8 is a core thread, 9 is an outer skin, an electrode wire 5 is spirally wound around the core thread 8, a thermosensitive resin 7 is filled around it, and an electrode wire 6 is similarly spirally wound around the core thread 8. These are covered with an outer skin 9.

FIG. 5 shows the impedance temperature characteristics of the thermosensitive resin 7, which has a characteristic that the impedance decreases as the temperature rises.

FIG. 6 is a partially cutaway perspective view showing the configuration of the heating element 3 that contributes to heating the electric carpet 1, in which the heater wire 10, the second
The electrode wire 11 and the insulating resin 12 are integrally constructed. 1
3 is a core yarn, 14 is an outer sheath, a heater wire 10 is spirally wound around the core yarn 13, an insulating resin 12 is filled around it, and a second electrode wire 11 is similarly spirally wound around the core yarn 13. These are covered with an outer skin 14.

FIG. 7 is a conventional temperature control circuit diagram. 15 is an AC power supply, and 16 is a power switch. 17, 18, 19.
20 is a resistor, 21.22 is a diode, 23.24
is a capacitor, and resistor 17 (resistance R)
, a pair of electrode wires 5 and 6, a thermosensitive resin 7 (impedance Z), a resistor 18, a diode 21, and a capacitor 23 to obtain a smoothed temperature signal voltage Vt of the positive cycle of the AC power supply 15. The relational expression for the voltage Vt of the detected temperature signal is expressed by the Habo equation (1), where the voltage of the AC power supply 15 is Vac.

Vt=1/ (1+R, t/Z) In addition, a diode 22, a resistor 19. The capacitor 24 applies a voltage to the thermosensitive resin 7 even during the negative cycle of the AC power supply 15, which is symmetrical to that during the positive cycle. This is because the temperature-sensitive resin 7 is a nylon-based chemical resin, so the purpose is to prevent its polarization from deteriorating and to stabilize its impedance.

25 is a diode, 26, 27, 28, 29, 30 are resistors, 31 is a variable resistor which is a temperature setting means for setting a desired temperature, and 3z is a capacitor, which smooths the temperature setting voltage Vs. is obtained.

33 is a comparator, and the temperature signal voltage V of the temperature thermosensitive resin 7 is
t and the temperature setting voltage Vs of the variable resistor 31 which is a temperature setting means.

34 is a diode, 35, 36 is a resistor, 37, 38 is a capacitor, and 39 is a constant voltage diode. These constitute a constant voltage circuit, and obtain driving power for the comparator 33 and the relay 40, which is a power control means. There is. 41 is a diode that absorbs the back electromotive force of the relay.

A control section 42 sends out a control signal based on a signal from the comparator 33, turns on and off a transistor 43 serving as a driving means, controls the relay 40, and controls the turning on and off of the heater wire 10.

44.45 is a diode, 46.47 is a heat generating resistor with a small resistance value, and 48 is a safety circuit.The control unit 42 has failed.

While the relay 40 remains in the ON state, the temperature of the heater wire 10 of the electric carpet main body 1 rises abnormally, the insulating resin 12 melts, and the second electrode wire 11 and the heater wire 10 come into contact, causing the heating resistor 46. A large current flows through 47, and the Joule heat causes the safety circuit 48 to operate and cut off the AC power supply 15. Incidentally, the impedance of the insulating resin 12 is normally very large, and therefore only a small current flows through the heating resistors 46 and 47, so the safety circuit 48 does not operate.

49 is a timer setting section, and 50 is a timer time display section.

Figure 8 shows an external view of this part. In FIG. 8, the user sets the timer setting knob 51 to the normal position and sets the current time on the timer time display section 5 by pressing the time setting buttons 52 and 53.
Match while looking at 0. Next, if you want to turn on the power switch 16 automatically at a certain time, set the timer setting knob 51 to auto-on, and use the time setting buttons 52 and 53 to set it to the time you want to turn on automatically. Turn the power to 0FFL.

If you want to set the timer setting knob 51 to automatic off, turn the power to 0FFL/set the time button 52 to the desired time.
．． Set the timer at 53. Settings are completed only after making these settings.

Problems to be Solved by the Invention Therefore, if the automatic ON and automatic OFF times do not change every day, the user only needs to set them once, but in reality, there may be times when the user wants to change the automatic ON and automatic OFF times depending on the day. In that case, I had to reset the auto-on and auto-off times.

Also, in the case of automatic OFF, you may go to bed or go out earlier than the set time. At this time, the power switch 16 may not be turned off, and the power may remain on for a long time. As a result, electricity was wasted, which was extremely problematic in terms of energy conservation and safety.

In addition, the following measures were taken to reduce operational complexity. In other words, if you press the automatic OFF switch, 1
It will automatically turn off after a certain amount of time. However, if you do not press the automatic OFF switch, it will automatically turn to 0.
Since there is no FFL, if you forget to press the automatic OFF switch, the power will continue to be on, which is still a problem in terms of energy conservation.

Also, there is a system that turns off the power after a certain period of time after turning on the power switch 16, but the usage time is not constant, so if you use it for longer than the set time, the power may turn off midway. If you only use it for a short time and forget to turn off the power switch, the power will be wasted for a long time until the set time, so there is still room for improvement in terms of usability, energy saving, and safety. .

The present invention solves the above-mentioned problems, and aims to provide a temperature control device that does not turn off the power midway due to a timer or waste power for a long period of time.

Means for Solving the Problems In order to solve the above problems, the temperature control device of the present invention includes:
a heating element that contributes to temperature collection; a power control means that controls energization to the heating element; a drive means that drives the power control means; a temperature setting means that sets the heating element to a predetermined temperature; an operating unit including a setting unit; a timer starting unit that starts each time the operating unit is operated; and when the timer starting unit counts up, it sends a signal to the driving unit to stop energizing the heating element. It is equipped with a timer management section.

Effect With the above-mentioned configuration, the timer starts every time the operation section including the temperature setting means is operated, and the power is automatically turned off when the timer is up, so that the timer is automatically turned off after a relatively short time after the last operation of the operation section. The power is actively stopped, so even if you forget to turn off the power switch, the power will be automatically turned off within a relatively short period of time, resulting in significant energy savings and safety.

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

FIG. 2 is a block diagram of an electric carpet according to an embodiment of the present invention. In FIG. 2, the electric carpet main body 100 is divided into two sides, right and left sides A and B, and the temperature is controlled on each side. 101゜102 are heater wires on A and B sides, 103 and 104 are temperature detection lines on A and B sides, 1
05 is a controller box.

FIG. 1 shows a temperature control circuit according to an embodiment of the present invention. 10
6 is an AC power supply, and 107 is a power switch.

Two temperature detection circuits are constructed corresponding to the two heater wires 101 and 102, respectively.

The operation of one of these temperature detection circuits will be explained. 108, 109, 110, 111 are resistances, 1
12 and 113 are diodes, 114 and 115 are capacitors, a resistor 108, a pair of electrode wires 103A, 10
A smoothed temperature signal voltage Vt of the positive cycle of the AC power supply 106 is obtained by the 3B temperature thermosensitive resin 116 (impedance Z), the resistor 109, the diode 112, and the capacitor 114, and as the temperature rises, the temperature thermosensitive resin 1
Since the impedance of 16 decreases, the smoothed temperature signal voltage Vt decreases. Furthermore, the diode 113, the resistor 110, and the capacitor 115 apply a voltage to the thermosensitive resin 116 that is symmetrical to that in the positive cycle even during the negative cycle of the AC power supply 106.

This is to prevent polarization deterioration and stabilize impedance since the temperature-sensitive resin 116 is a nylon-based chemical resin. The other temperature detection circuit is resistor 1
17, 118, 119, 120, diode 121゜1
22, capacitors 123, 124, pair of electrode wires 104
A.

104B, it is constructed of temperature-sensitive resin 125 and operates in the same manner.

Next, one temperature setting circuit will be explained.

126 is a diode, 127, 128, 129 are resistors,
130 is a variable resistor which is a temperature setting means for setting a desired temperature, 131 is a capacitor, and the other temperature setting circuit which is smoothed by these to obtain the temperature setting voltage Vs is a diode 132. Resistance 133, 134, 13
5. It is composed of a variable resistor 136 and a capacitor 137, and operates in the same way.

138 and 139 are comparators, and temperature-sensitive resins 116,
The temperature signal voltage Vt of 125 is compared with the temperature setting voltage Vs of 130 and 136 of the variable resistor which is the temperature setting means. Resistors 140, 141, 142, and 143 protect the inputs of comparators 138 and 139.

144 is a diode, 145 and 146 are resistors, 147
, 148 is a capacitor, 149 is a constant voltage diode, these constitute a constant voltage circuit, and the control means 14
9. Obtains driving power for relays 150 and 15I, which are power control means. 152 and 153 are diodes that absorb the back electromotive force of the relay. The control means 180 is the comparator 1
A control signal is sent out based on the signal from 38° 139, and the transistors 154 and 155, which are driving means, are turned on and off to control the relays 150 and 151, and the heater wire 10
Controls the on/off of 1,102.

156, 157.158.159 are diodes, 16
0,161,162° 163 is a heating resistor with a small resistance value, 164 is a safety circuit, and if the control means 180 breaks down,
For example, when the relay 150 remains in the ON state, the temperature of the heater wire 101 of the electric carpet main body 1.00 rises abnormally, the insulating resin 165 melts, and the second electrode wire 166 and the heater wire 101 come into contact, generating heat. Resistance 160,1
A large current flows through 61, and the Joule heat causes the safety circuit 164 to
operates to cut off the AC power supply 106. Note that normally, the impedance of the insulating resin 165 is very large, and therefore only a small current flows through the heating resistors 160 and 161, so the safety circuit 164 does not operate. The diodes 158 and 159, heating resistors 162 and 163, thermosensitive resin 167, and electrode wire 168 also function in the same manner.

169.170 is an area changeover switch that changes the energized area of the electric carpet body lOO, 171,172
is a resistor, and if you want to energize both A and B, switch 1
Turn on 69 and 170, and switch 1 when only side A is on.
69, when only the B side is selected, the switch 170 is turned on. 173 is a timer starting section, and the change in the signal of the variable resistor 130, 136, which is the temperature setting means, or the change in the signal from the area changeover switch 169, 170 is performed. Detects a change in the signal and starts the timer. That is, when the user changes the temperature setting or changes the selection of the energized area, the timer activation section 173 activates the timer. If the user changes the variable resistor 130, 136 or area changeover switch 169, 170, which is the temperature setting means, again before the timer counts up, the previous timer count value is reset and the timer is restarted. do. Then, when the timer management means 174 counts up after a certain period of time, the control means 180 stops the signal to the relays 150 and 151, which are power control means.

In this example, the timer is assumed to start when the 1-area changeover switch or temperature setting is changed.
Alternatively, for example, the timer may be activated even if other operating parts change, such as when the signal of the tick drive switch changes, and the relay, which is the power control means, may be stopped as well.

175 is a timer off switch, and if you know in advance that you will be using it for a long time, turning on this switch will prevent the timer function from working so that the power will not be stopped midway. This makes it easier to use.

As a result, unlike conventional devices that have a function to automatically stop energizing a relatively long time after turning on the power switch, in this embodiment, the user actually controls the temperature and adjusts the energized area. Since the power will be automatically turned off relatively shortly after the last operation of a control section such as a changeover switch, if the user forgets to turn off the power switch and goes to bed or goes out, it will be a waste of time. The problem of energization is further reduced. In particular, electric carpets are used very often on a daily basis, and the temperature must be adjusted and the energized area must be changed frequently. big.

Effects of the Invention As described above, according to the temperature control device of the present invention, the power supply is automatically stopped after a certain period of time after the last change in the operating section including the temperature setting, without the user being particularly conscious of it. This reduces the problem of unnecessary energization even when you go to bed or go out, and has great effects on energy saving and safety.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram of a temperature control device for an electric carpet according to an embodiment of the present invention, Fig. 2 is a block diagram of the electric carpet, Fig. 3 is a block diagram of a conventional electric carpet, and Fig. 4 is a block diagram of the electric carpet according to the present invention. FIG. 5 is a diagram showing the impedance change characteristics of the temperature-sensitive resin. FIG. 6 is a partially cut-away perspective view showing the configuration of the heating element. FIG. 7 is the temperature diagram of the conventional example. The control circuit diagram of the control device, FIG. 8, is an external view of a conventional electric carpet controller box. 100... Electric carpet body, 101, 102.
...heater wire. 103.104...Temperature detection line, 116,125.
...Temperature thermosensitive resin, 130.136...Variable resistor (
temperature setting means), 138, 139... comparator, 1
50,151...Relay (power control means). 154.155...transistor (driving means),
169,170...area changeover switch, 173.
...Timer starting section, 174...Timer management section, 180
...control means. Fig. 2 Fig. 8 Fig. 4

Claims (1)

[Claims] 1. A heating element that contributes to temperature collection, a power control means that controls energization to the heating element, a driving means that drives the power control means, and a temperature setting means that sets the heating element to a predetermined temperature; an operating section including at least a temperature setting means; a timer starting means that starts each time the operating section is operated; and when the timer starting means counts up, it sends a signal to the driving means to stop energizing the heating element. A temperature control device for an electric heating device equipped with a timer management section for sending out data.