JPH0668379B2 - Temperature control device - Google Patents

Description

The present invention relates to a temperature control device most suitable for electric heaters such as electric kotatsu and electric carpet.

(B) Conventional technology In an electric heater such as an electric kotatsu, a thermostat provided in the heater unit is adjusted to obtain a desired temperature. As a representative prior art of this, Jikho Sho 57-5
There is a 6113 publication.

And when describing the case of using the above Kotatsu, for example, when the user is leaving the seat for a while for some reason when using the set temperature "strong", the thermostat is operated. Then, the set temperature is lowered to an appropriate temperature to save power consumption, and when the user puts his foot into the kotatsu again, the thermostat is operated to raise the set temperature. Therefore, each time the user leaves the kotatsu, the user has to operate the thermostat twice, which is very troublesome.

(C) Problems to be Solved by the Invention The present invention, during energization of the heater, during a certain time,
The temperature is set lower than the set temperature set by the temperature setting means, and the slow heat setting means for returning to the original set temperature after a lapse of a fixed time is provided to improve the usability.

(D) Means for Solving the Problems The present invention provides a heater, a temperature detecting means for detecting the temperature of an appliance, a temperature setting means for setting the appliance to a desired temperature, and a setting set by the temperature setting means. A gentle heat setting means for setting a temperature lower than the temperature is provided, and the gentle heat setting means is configured to return to the original set temperature set by the temperature setting means after a lapse of a predetermined time after the operation.

(E) Action When the gentle heat setting means is operated while the heater is energized, the temperature is automatically set to a temperature lower than the set temperature set by the temperature setting means, and the temperature setting means is set after a lapse of a certain time from the operation point. Return to the set temperature set by.

(F) Embodiments Embodiments of the present invention will be described with reference to the drawings.

(1) is a heater mounted in a heater unit (not shown) of kotatsu (not shown), (2) is a semiconductor control element (hereinafter referred to as TRIAC) connected in series to the heater, and (3) is predetermined The microcomputer that inputs the program of the above, the heater based on the program previously input
It controls the energization of (1) and the lighting of a display (not shown). As shown in FIG. 2, the microcomputer (3) is equivalently illustrated with an UP-DOWN counter (3A) and a decoder (3) connected to the counter.
B), a timer (3C), and a pulse conversion circuit (3D) for converting the output of the timer into a one-shot pulse. The timer (3C) and pulse conversion circuit (3D)
Are connected in series, and the pulse conversion circuit is connected to the UP terminal (O ₁ ) of the UP-DOWN counter (3A).

(4) is a DC power supply circuit to be applied to the microcomputer (3), and (5) is a pulse generation circuit for generating a pulse in the vicinity of 0 degree of the AC power supply waveform, which is for obtaining a reference signal of the microcomputer. (6) is an operation switch connected to the microcomputer (3), which is the UP-DOWN
Set value increase switch (7) connected between the UP terminal (O ₁ ) of the counter (3A) and the DC power supply, and set value decrease connected between the DOWN terminal (O ₂ ) of the UP-DOWN counter (3A) and the DC power supply It has a switch (8). (9a) ...
(9f) is an output terminal (O ₄ ) of the decoder (3B) ...
With multiple ladder resistors connected to (O ₉ ), the resistance value is on the “strong” temperature side 9a (strong) <9b (4) <9C (3) <9d (2).
<9e (1) <9b (weak) Set to the “weak” temperature side.

Therefore, when the set value increasing switch (7) is operated, the output of the decoder (3B) is (9f) → (9e) → (9d) →
The respective resistances are selected in the order of (9c) → (9b) → (9a) and become “H” level. Operation switch (6) and UP
-The DOWN counter (3A) and the decoder (3B) constitute a temperature setting means (10).

(11) is a temperature detecting means (hereinafter referred to as a thermistor) for detecting the temperature of a device mounted in the heater unit, which has a negative characteristic that the resistance value decreases depending on the temperature. (12) is a capacitor connected to one end of the ladder resistor (9a) ... (9f), (13) is a resistor connected in series with the thermistor (11), (1
4) has the non-inverting input terminal connected to the ladder resistor (9a) ... (9
f) a comparator connected to the connection between the capacitor (12) and the inverting input terminal connected to the connection between the thermistor (11) and the resistor (13), and (15) is the output terminal of the microcomputer (3). A potential drop circuit connected between the non-inverting input terminal of the comparator (14) and composed of resistors (16), (17) and (8) and an absorbing transistor (19). (20) is UP-DOWN counter (3A) through diode (21)
DOWN input (O ₂ ) and the slow heat switch connected between the DC power supply and DOWN input by the operation, and the timer (3C) starts counting and after a certain period of time, the one-shot pulse is generated by the pulse conversion circuit (3D). UP
input. Therefore, by operating the slow heat switch (20), the temperature is set to a temperature lower than the set temperature set by the temperature setting means (10), and the original set temperature is restored after a fixed period of time by the timer (3C). . That is, the slow heat switch
(20), the UP-DOWN counter (3A), the timer (3C) and the decoder (3B) constitute a slow heat setting means (21). Reference numeral (22) is a differentiating circuit connected to the output terminal of the comparator (14) and is composed of a capacitor (23) and a resistor (24). Reference numeral (25) is a driving transistor of the TRIAC (2) connected to the differentiating circuit (22), which is connected to the gate of the TRIAC (2) via the resistor (26). (27) is a power switch, and (28) is an AC power supply.

Next, the operation will be described. When the power switch (27) is turned on, the pulse generator circuit (5) outputs an AC power waveform (a in FIG. 4A) to the input terminal (I ₂ ) of the microcomputer (3). The pulse generated in the vicinity of 0 degree (B in FIG. 4A) is input. Further, the output terminal (O ₁₀ ) of the microcomputer (3) outputs a pulse (C in FIG. 4A) synchronized with the AC power supply waveform, turns on the absorption transistor (19), and discharges the capacitor (12). To do.

Then, explaining together with the flowchart of FIG. 3 and the waveform diagram of FIG. 4, at the beginning of energization, the set value increasing switch (7) is continuously operated because the temperature inside the kotatsu is low, and the “strong” position is set. When set to, steps (A) (B) U in Fig. 3
Decoder (3) by P-DOWN counter (3A)
When the output terminal (O ₄ ) of B) becomes “H” level and the potential (Vc) of the non-inverting input terminal of the comparator (14) rises rapidly and the output terminal (O ₁₀ ) becomes “H” level. The capacitor (12) is discharged. (D in FIG. 4A)
At this time, since the resistance value of the thermistor (11) is large, the potential (VTh) of the inverting input terminal of the comparator (14) is low, and the potential (Vc) and (VT
At the point where h) crosses, the output terminal becomes the "H" level and the driving transistor (25) is turned on by the pulse of the differentiating circuit (22) (e in Fig. 4A), and the TRIAC (2) becomes conductive, and the heater ( 1) generates heat. (Step (C) in Fig. 3 and F in Fig. 4A) When the temperature inside the kotatsu reaches the temperature set by the set value increase switch (7), the resistance value of the thermistor (11) decreases. When the potential (VTh) of the inverting input terminal of the comparator (14) rises, the point where the potentials (Vc) and (VTh) intersect moves and the duty ratio decreases. (Step (C) in FIG. 3, D, E, and F in FIG. 4B) In this way, the strong control is maintained, but when the user leaves the kotatsu for some reason, it is loose. When the thermal switch (20) is operated (Fig. 3, step (D)), the timer (3C)
Starts counting (Step (E) in Fig. 3) U
DOWN terminal (O ₂ ) of P-DOWN counter (3A)
Is input to the set value increasing switch (7) and the set temperature is set to be one step lower than the temperature set by the set value increasing switch (7). That is,
When the output terminal (O ₄ ) of the decoder (3B) is set to “H” level due to the high setting, it becomes “L” level and the output terminal (O ₅ ) lower by one level is changed from “L” level to “H”.
It becomes a level. For this reason, the potential (Vc) is lowered, the point intersecting with the potential (VTh) is moved, the energization rate is lowered, and the set value (4) is controlled. (Step (F) in FIG. 3, D, E, and F in FIG. 4C) Then, when the timer (3C) finishes counting for a fixed time (15 minutes), a pulse conversion circuit based on the output of the timer (3c) UP-D by pulse from (3D)
Input to the UP terminal (O ₁ ) of the OWN counter (3A), the output terminal (O ₅ ) of the decoder (3B) changes from “H” level to “L” level, and the output terminal (O ₄ ) changes from “L” level. The "H" level is reached and the set temperature at the "strong" position is automatically restored again. (Step (G) in FIG. 3) The above operation has been described for the case where the temperature setting means (10) is set to the "strong" position, but in the case of the temperature setting value (4), the setting value (3) The same applies to the case of setting value (2) and setting value (1).

Further, in the case of this embodiment, the fixed time by the timer (3c) is set to 15 minutes, but it may be set to 20 minutes and the user may set it to an arbitrary time in advance.

Fig. 5 shows the volume resistance (2) in place of the ladder resistance shown in Fig. 1.
9) is used to show another embodiment in which the other two resistors (30) and (31) are combined, and the volume (2
The heater (1) is controlled according to the temperature set by 9). That is, the output terminal (O ₁ ) of the decoder (3B) is always set to “H” level and the output terminal (O ₂ ) is set to “L” level. When the slow heat switch (20) shown in FIG. 1 is operated, the output terminal (O ₁ ) changes from the “H” level to the “L” level and the output terminal (O ₂ ) changes from the “L” level to the “H” level. It becomes a level, and it falls to the temperature set by the resistance (30). In this case, the temperature at the time of the decrease is determined by the resistance value of the resistance (30) .For example, if the resistance (30) is replaced with a volume, when the user operates the slow heat switch (20) arbitrarily. The temperature can be set.

In the present invention, the temperature after the operation of the slow heat switch is lowered to the temperature one step lower than the set temperature set before the operation of the slow heat switch, but it may be lowered by two steps. or,
Although the amount of heat generated by the heater is changed by phase control, on / off control may be used.

(G) Effect of the Invention As described above, the present invention sets the temperature lower than the set temperature set by the temperature setting means by the slow heat setting means during energization of the heater, and returns to the original temperature after a certain period of time. Since the temperature returns to the set temperature, when the user uses the device for some reason and leaves the device for some reason, the slow heat setting means can reduce the power consumption, which is economical. In addition, since the temperature of the device is high even if the user is far from the device, it can be warmed immediately and the slow heat setting means returns to the original set temperature after a certain period of time. It will be easy.

Further, since the set temperature after the operation of the gentle heat setting means is set to a temperature one or two steps lower than the temperature set by the temperature setting means, the temperature suddenly drops and feels cold, or It does not spoil the taste of cooked foods.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of the present invention, FIG. 2 is a schematic circuit diagram of main parts, FIG. 3 is a flowchart, and FIG. 4 is a waveform diagram of each part, where A is a set temperature “strong” and an unstable state. , B are also "strong" in the stable state, and C is "strong" in the case of operating the slow heat setting means. FIG. 5 shows a circuit in which a part of the circuit in FIG. 1 is replaced with another circuit. It is a partial electric circuit diagram. (1) …… Heater, (10) …… Operation switch (6) and UP-DO
Temperature setting means including WN counter (3A) and decoder (3B), (21) ... slow heat switch (20) and timer (3)
c), a mild heat setting means including an UP-DOWN counter (3A) and a decoder (3B).

Front page continuation (72) Inventor Noriaki Hirano 3-201 Minamiyoshikata, Tottori-shi, Tottori Sanyo Electric Co., Ltd. (72) Yasumasa Yamane 3-201 Minamiyoshikata, Tottori-shi, Tottori Sanyo Electric Co., Ltd. (72) Inventor Shigeru Matsuo 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Denki Co., Ltd. (56) References Jikkaku Sho 57-56113 (JP, Y2)

Claims (2)

[Claims] 1. A heater, a temperature detection means for detecting the temperature of an appliance heated or heated by the heater, and an operation switch, and a temperature setting for setting the appliance to a desired temperature based on the operation of the switch. Means, and a slow heat setting means having a slow heat switch for setting the temperature lower than the set temperature set by the temperature setting means, the slow heat setting means,
A temperature control device which returns to the original set temperature set by the temperature setting means after a lapse of a predetermined time after the operation of the slow heating switch. 2. The temperature set by the temperature setting means selects one of a plurality of preset calorific values, and the temperature set by the slow heating setting means is set by the temperature setting means. The temperature control device according to claim 1, wherein the temperature is set to a temperature one step or two steps lower than the set temperature that has been set.