JP2000276239A - Sauna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the far infrared effect of a heater from being reduced by supplying uniform power to the heater while keeping the temperature in a heating chamber almost at a set temperature. SOLUTION: The inside of the heating chamber is heated by a heater 12 connected to an AC power source 13 and between the AC power source 13 and the heater 12, a TRIAC 14 is connected so as to arbitrarily change the timing of operation corresponding to the phase of the AC power source. A photocoupler 16 outputs a trigger pulse to a gate terminal 14a of the TRIAC 14 and changes the timing to operate the TRIAC 14 and on the basis of the set temperature and detected temperature of a temperature setting switch 27 and an intra-heating chamber temperature sensor 28, a control circuit 32 controls the photocoupler 16. When the detected temperature reaches the set temperature, the control circuit 32 impresses the voltage of the AC power source 13 to the heater 12 just for prescribed time from 0 to π and from π to 2π in each cycle of the voltage of the AC power source 13 and prolongs/shortens the prescribed time so as to maintain the detected temperature at the set temperature by increasing/decreasing the output of the heater 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small household sauna apparatus.

[0002]

2. Description of the Related Art Conventionally, as a sauna apparatus of this type, the surface temperature of an infrared heater is detected by a temperature sensor, and the surface temperature of the infrared heater is set by a setting switch. A temperature controller for an electric sauna bath using an infrared heater configured to control the surface temperature of the heater to a set temperature while comparing the temperature of the heater with the heater is disclosed (JP-A-59-108).
555). In this temperature control device, the surface temperature of the heater is controlled to a high temperature when preparing for bathing, and the surface temperature of the heater is controlled to a temperature at which far infrared rays of a predetermined wavelength optimal for a bather are radiated during bathing. As a result, the bath preparation time is short, and the bather can receive far-infrared rays having the optimum wavelength. Further, when the surface temperature of the infrared heater becomes higher than the set temperature of the setting switch, the energization of heating to the far infrared heater is cut off.

[0003]

However, in the conventional temperature control device for an electric sauna bath disclosed in JP-A-59-108555, when the surface temperature of the heater becomes higher than a set temperature, power is supplied to the heater. Is cut off, and the temperature in the heating chamber drops rapidly, so that the temperature in the heating chamber cannot be kept almost constant, and there is a problem that a bather cannot take far-infrared rays. An object of the present invention is to provide a sauna apparatus that can maintain the temperature in a heating chamber substantially at a set temperature, can supply even power to a heater, and does not reduce the far-infrared effect of the heater. It is in.

[0004]

The invention according to claim 1 is
As shown in FIGS. 1, 2 and 4, a heater 12 is connected to an AC power supply 13 and heats the inside of the heating chamber 11 a, and is connected between the AC power supply 13 and the heater 12 according to the phase of the AC power supply 13. A triac 14 whose operation timing can be changed arbitrarily; a photocoupler 16 which outputs a trigger pulse to a gate terminal 14a of the triac 14 to change the operation timing of the triac 14;
Temperature setting switch 27 for setting the temperature inside the heating chamber 1
1a, and a photocoupler 16 based on the temperature setting switch 27 and the set temperature Ts and the detected temperature Tr of the heating room temperature sensor 28.
This is an improvement of the sauna apparatus including the control circuit 32 for controlling the temperature of the sauna. The characteristic configuration is that the detected temperature Tr is equal to the set temperature T.
s, the control circuit 32 controls the photocoupler 16 to control the AC power supply 1 for a predetermined time between 0 and π and π and 2π in each cycle of the voltage of the AC power supply 13.
3 is applied to the heater 12, and the output of the heater 12 is reduced by shortening the predetermined time, and the output of the heater 12 is increased by increasing the predetermined time to set the detection temperature Tr. It is configured to maintain the temperature Ts.

In the sauna apparatus according to the first aspect, when the set temperature Ts is set by the temperature setting switch 27, the control circuit 32 compares the detected temperature Tr of the heating chamber temperature sensor 28 with the set temperature Ts and detects the temperature. When the temperature Tr is lower than the set temperature Ts, the output of the heater 12 is maximized. At this time, the control circuit 32 controls the photocoupler 16 to connect the heater 1 to the gate terminal 14a of the triac 14.
The trigger pulse is output so that the output of No. 2 becomes maximum.
When the control circuit 32 determines that the detected temperature Tr has exceeded the set temperature Ts after a predetermined time has elapsed, the output of the heater 12 is reduced. At this time, since the control circuit 32 outputs the trigger pulse generation timing to the gate terminal 14a of the triac 14 with a delay of a predetermined time, the output of the heater 12 is reduced. While the detected temperature Tr is higher than the set temperature Ts, the generation timing of the trigger pulse is further delayed so that the heater 1
2 is further reduced. On the other hand, when the detected temperature Tr is lower than the set temperature Ts, the control circuit 32 advances the trigger pulse generation timing to increase the output of the heater 12, and while the detected temperature Tr is lower than the set temperature Ts, the control circuit 32 sets the trigger pulse generation timing. The output of the heater 12 is further increased earlier. By controlling the heater 12 in this manner, the temperature Tr in the heating chamber 11a can be substantially maintained at the set temperature Ts.

The invention according to claim 2 is the invention according to claim 1, wherein the control circuit 32 controls the output of the heater 12 via the photocoupler 16 and the triac 14, as shown in FIGS. It is configured to be switchable to multiple stages,
The control circuit 32 detects the detected temperature Tr of the heating chamber temperature sensor 28.
Is compared with the set temperature Ts of the temperature setting switch 27, and the output of the heater 12 is sequentially switched to a predetermined stage.
The apparatus is characterized in that the detection temperature Tr is maintained at the set temperature Ts. In the sauna device according to the second aspect, the control circuit 32 sets the detected temperature Tr to the set temperature Ts.
Since the output of the heater 12 suitable for maintaining the temperature is selected and switched from a plurality of stages, the pulsation of the temperature change can be reduced.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIGS. 1 and 2, the sauna apparatus 10 includes a sauna body 11 having a heating chamber 11 a in which a bather can take a bath, and a heater 12 embedded in a bottom wall 11 b and a peripheral wall 11 c of the sauna body 11. The sauna body 11 has a storage box 11d having an open front surface, and an enclosure 11e attached to the front surface of the storage box 11d (FIG. 2). The surrounding wall 11e is formed so as to be foldable, and is stored in the storage box 11d in a folded state.
The heater 12 is a far-infrared heater.
(FIG. 1). When the heater 12 is energized,
The inside of the heating chamber 11a is heated and far infrared rays are radiated into the heating chamber 11a.

As shown in FIG. 1, a triac 14 is connected between an AC power supply 13 and a heater 12, and a gate terminal 14a of the triac 14 is connected to the gate terminal 14a.
Is connected to a photocoupler 16 that outputs a trigger pulse. The triac 14 is a two-way three-terminal thyristor, and has an input terminal 14b connected to the AC power supply 13, an output terminal 14c connected to the heater 13, and the gate terminal 14a. When the triac 14 outputs a trigger pulse to the gate terminal 14a, current flows from the AC power supply 13 between the input terminal 14b and the output terminal 14c, the triac 14 operates, and the voltage of the AC power supply 13 becomes 0V.
Then, no current flows between the input terminal 14b and the output terminal 14c, and the triac 14 is deactivated.

The photocoupler 16 has a light emitting diode 17 (light emitting element) that emits light when a predetermined voltage is applied, and a diac 18 (light receiving element) that generates a predetermined voltage when light from the light emitting diode 17 is received. The light emitting diode 17 and the diac 18 are housed in one package. Since the photocoupler 16 uses light as a medium,
The input and output are electrically separated, and the ground line of the circuit can be separated, which has the effect of reducing noise. The first terminal 18 a of the diac 18 is connected to the first resistor 21.
Are connected to the input terminal 14b of the triac 14 and directly to the gate terminal 14a. The second terminal 18b of the diac 18 is connected to the output terminal 14c of the triac 14 via the second resistor 22.

On the other hand, a control box 2 is provided in the heating chamber 11a.
6 are attached (FIG. 2). The control box 26 is provided with a temperature setting switch 27 which is operated by a bather to set the temperature in the heating chamber 11a. The heating chamber temperature sensor 2 for detecting the temperature in the heating chamber 11a is provided in the heating chamber 11a.
8 are provided (FIG. 1). In this embodiment, the heating room temperature sensor 28 is mounted at a position relatively close to the heater 12, and the temperature setting switch 27 is
The temperature at the mounting position 8 can be set in six steps at 77 ° C. to 52 ° C. every 5 ° C. On the other hand, since the temperature in the center of the heating chamber is relatively far from the heater, it is lower by about 11 to 13 ° C. than the temperature detected by the temperature sensor 28 in the heating chamber. That is, when the temperature setting switch 27 is set at 77 to 52 ° C., the temperature at the center of the heating chamber is about 65 to 40 ° C. Further, inside the control box 26, a zero-cross detection sensor 29 that reads the voltage waveform of the AC power supply 13 to detect the timing when the voltage of the AC power supply 13 becomes 0 V, and a temperature sensor 31 inside the control box that detects the temperature inside the control box 26 Are provided (FIG. 1).

The control box 26 includes a photocoupler 1
6 is accommodated (FIGS. 1 and 2). The control circuit 32 includes a controller 33 and a trigger pulse generation circuit 34 (FIG. 1). The detection outputs of the temperature setting switch 27, the heating room temperature sensor 28, the zero-cross detection sensor 29, and the temperature sensor 31 in the control box are connected to the control input of the CPU 33a of the controller 33 via the A / D conversion circuit 33b.
The control output a is connected to the light emitting diode 17 via the A / D conversion circuit 33c and the trigger pulse generation circuit 34. The trigger pulse generating circuit 34 includes an operational amplifier 36 having an input terminal 36a connected to the control output of the CPU 33a via an A / D conversion circuit 33c, and a base 37a via an output terminal 36b of the operational amplifier 36 via the third resistor 23.
And a switching transistor 37 connected thereto. A DC power supply 38 is connected to the collector 37b of the switching transistor 37 via the light emitting diode 17 and the fourth resistor 24, and the emitter 37c is grounded. A DC power supply 39 is connected between the output terminal 36 b of the operational amplifier 36 and the third resistor 23 via the fifth resistor 25.

On the other hand, a memory 33d and a timer 33e are connected to the CPU 33a. The heating chamber 11 is stored in the memory 33d.
The temperature at which the power supply to the heater 12 is stopped is stored in consideration of the influence on the bather when the inside of the control box 26 or the inside of the control box 26 is overheated and the influence on the electronic components in the control box 26. For example, if the temperature detected by the heating room temperature sensor 28 is 85
It is detected that the temperature reaches a predetermined temperature within the range of ~ 95 ° C, or the temperature detected by the temperature sensor in the control box is 80 ° C.
The CPU 33a is configured to stop energizing the heater 12 when it detects that the temperature has reached a predetermined temperature in the range of up to 90 ° C. The memory 33d stores the generation timing of the trigger pulse to be output to the triac 14 in order to switch the output of the heater 12 stepwise. For example, a 100 V (50 Hz) AC power supply 13 and a 1200 V
When the W (100%) heater 12 is used, the heater 12
Generation of a trigger pulse timing T ₁ of the order to switch the output of the six stages until 1200W～200W (AC power source 13
(A time from when the voltage of 0 V reaches 0 V until a trigger pulse is generated) is stored, and the generation timing of the trigger pulse is shown in Table 1 and FIG. Note that T ₀ in FIG.
m seconds (half of the period (20 ms)). The application of a voltage of a predetermined time (10-T ₁₎ m sec by the AC power supply 13 between the voltage of the AC power supply 13 is the first half of the respective cycle (0~π) and late (π~2π) to the heater 12 It is configured as follows.

[0013]

[Table 1]

When the detected temperature of the heating chamber temperature sensor 28 is higher than the temperature set by the temperature setting switch 27, the memory 33d stores a temperature difference to which the output of the heater 12 should be switched. Specifically, when the output of the heater 12 is 1200 W and the detected temperature is 0 to 3 ° C. higher than the set temperature, the output is switched to 1000 W. When the detected temperature is higher than 3 to 6 ° C., the output is switched to 800 W. In this case, it is configured to switch to 600 W, to switch to 400 W when the temperature is higher than 9 to 12 ° C., and to switch to 200 W when higher than 12 ° C. On the other hand, when the detected temperature becomes lower than the set temperature, the output is switched to one step higher than the output of the heater 12 at that time. The timer 33e switches the output of the heater 12 based on the difference between the temperature set by the temperature setting switch 27 and the temperature detected by the heating chamber temperature sensor 28 (10 to 60).
Second, preferably 30 seconds). Although not shown, a notifying means (a lamp or a buzzer) for notifying the bather that the detected temperature has reached the set temperature is connected to the control output of the CPU 33a.

In addition to the temperature control, a manual switch (not shown) capable of manually switching the output of the heater 12 in six stages is connected to the control input of the CPU 33a in the control box 26. Is provided with a limit switch (not shown) that opens when the surrounding wall body 11e is folded and closes when the surrounding wall body 11e is deployed. This limit switch is connected between the heater 12 and the AC power supply 13. Further, the CPU 33a has a time during which the heater 12 is turned on separately from the timer 33e (for example, 60 minutes).
A timer (not shown) for measuring
“a” is configured so that the heater 12 is turned off when the above-mentioned time has elapsed after the heater 12 is energized based on the measurement time of the timer. A remote switch (not shown) that can manually turn on and off the heater 12 is connected to the control input of the CPU 33a. This switch is connected to the control box 26 via a cable (not shown) extending outside the sauna body 11 and is placed near the front of the sauna body 11.

Further, as shown in FIG. 2, speakers 42, 42 of the audio equipment 41 are mounted in the heating chamber 11a, and the output terminals of the amplifier 43 provided outside the heating chamber 11a are connected to the input terminals of the speakers 42, 42. Terminals are connected. Amplifier 43
The input terminals are connected to the output terminals of the player 44 and the tuner 45, and the amplifier 43, the player 44 and the tuner 45 are connected to the AC power supply 12. The players 44 include a CD player, an MD player, a record player,
And a cassette tape deck. Note that one of the output terminals of the player and the tuner may be connected to the input terminal of the amplifier.

The operation of the thus constructed sauna apparatus will be described with reference to the flowchart of FIG. First, the power of the sauna device 10 is turned on, and the temperature setting switch 27 is operated to set the set temperature Ts to 77 ° C. (the temperature 6 in the center of the heating chamber 11a).
5 ° C). The CPU 33a takes in the detected temperature Tr of the heating chamber temperature sensor 28, compares it with the set temperature Ts, determines that the detected temperature Tr is lower than the set temperature Ts, and sets the output of the heater 12 to 1200W. At this time, CPU3
3a reads the capture timing of the voltage of the AC power source 13 becomes 0V by the detection output of the zero crossing detection sensor 29, and generates the timing T ₁ of the trigger pulse from the memory 33d is 0m seconds (Table 1), the AC power supply 13 When the voltage is 0 V, a small voltage that generates a pulse is output to the operational amplifier 36.

The minute voltage having this pulse is amplified by the operational amplifier 36 and the switching transistor 37
Is supplied to the base 37a of the switching transistor 37, a trigger pulse is generated in the collector 37b of the switching transistor 37 and the light emitting diode 18, and the trigger pulse causes the light emitting diode 17 to blink. Lights momentarily every time it becomes 0V. The trigger pulse having the same phase as the trigger pulse is generated in the diac 18 by the blinking of the light emitting diode 17, and the trigger pulse is output to the gate terminal 14 a of the triac 14. That is, the voltage of the AC power supply 13 is 0 V
Is reached, a trigger pulse is output to the gate terminal 14a of the triac 14, and the triac 14 operates.
When the voltage becomes 0 V again after 10 ms, the operation becomes inoperative. However, at the same time as the operation becomes inoperative, the trigger pulse is again output to the gate terminal 14a, so that the triac 14 operates again. As a result, the voltage of the hatched portion in FIG. 3 is applied to the heater 12 by the triac 14, so that the output of the heater 12 becomes 1200 W. on the other hand,
The timer 33e measures the time from when the power of the sauna device 10 is turned on, and when 30 seconds have elapsed, the CPU 33a compares the detected temperature Tr with the set temperature Ts, and when the detected temperature Tr is lower than the set temperature Ts, the heater 33 12 outputs to 12
Keep at 00W.

After keeping the heater 12 at 1200 W for 30 seconds, the CPU 33a compares the detected temperature Tr with the set temperature Ts, and when it is determined that the detected temperature Tr has exceeded the set temperature Ts, the difference between the detected temperature Tr and the set temperature Ts. When the difference is 2 ° C. (3 ° C. or less) as shown in FIG. 5, the output of the heater 12 is switched to 1000 W. At this time, CP
U33a captures the timing at which the voltage of the AC power supply 13 becomes 0 V based on the detection output of the zero-crossing detection sensor 29,
And the trigger pulse generation timing T from the memory 33d.
₁ is 2.7 ms (Table 1).
A small voltage that generates a pulse 2.7 msec after the voltage of 0 V is output to the operational amplifier 36. Thereafter, in the same manner as above, the voltage of the hatched portion in FIG. 3 is applied to the heater 12 by the triac 14, so that the output of the heater 12 becomes 1000 W. Further, when the detected temperature Tr exceeds the set temperature Ts, the CPU 33a activates the notification means (not shown), so that the bather can know from this that the temperature in the heating chamber 11a has reached the set temperature. Enters the heating chamber 11a. Note that the bather may enter the heating chamber 11a from when the power of the sauna device 10 is turned on.

After keeping the heater 12 at 1000 W for 30 seconds, the CPU 33a compares the detected temperature Tr with the set temperature Ts, and switches the output of the heater 12 to 800 W when the detected temperature Tr is still higher than the set temperature Ts (FIG. 3). ). While the detected temperature Tr is higher than the set temperature Ts, the temperature is sequentially switched to 600 W (FIG. 3), 400 W (FIG. 3) and 200 W (FIG. 3) every 30 seconds. When the output of the heater 12 is maintained at 200 W, the detected temperature Tr becomes the set temperature T.
s, the CPU 33a sets the heater 12
Is switched to 400 W. If the detected temperature Tr is still lower than the set temperature Ts even after 30 seconds, the output is switched to 600 W. 3 while the detected temperature Tr is lower than the set temperature Ts
600W, 800W, 1000W and 1200 every 0 seconds
When the detected temperature Tr exceeds the set temperature Ts, the CPU 33a decreases the output of the heater 12 step by step. By this repetition, the detected temperature gradually converges to the set temperature as shown in FIG. By controlling the heater 12 in this manner, the temperature Tr in the heating chamber 11a can be substantially maintained at the set temperature Ts. The heater 12
Is not performed by energizing and stopping the heater 12, and the heater 12 is controlled in a state where the heater 12 is always energized, so that uniform power can be supplied to the heater 12 and far infrared rays of the heater 12 can be supplied. There is no diminishing effect.

On the other hand, when the set temperature Ts is 52 ° C.
When the temperature is set to a relatively low temperature (40 ° C. in the center of a), the CPU 33a first takes in the detected temperature Tr of the heating chamber temperature sensor 28 in the same manner as described above, compares it with the set temperature Ts, and sets the detected temperature Tr. It is determined that the temperature is lower than Ts,
The output of the heater 12 is set to 1200 W. Next, the CPU 33
a compares the detected temperature Tr with the set temperature Ts,
r has exceeded the set temperature Ts, the detected temperature Tr
Is calculated, and if the difference is 3.5 ° C. (3 to 6 ° C.) as shown in FIG. 6, the output of the heater 12 is switched to 800 W instead of 1000 W. As a result, even if the detected temperature Tr greatly exceeds the set temperature Ts, the temperature quickly decreases to the set temperature. The following operations are substantially the same as those described above, and the description thereof will not be repeated.

The door of the heating chamber 11a is opened to open the heating chamber 11a.
When the air in a is used in a ventilated state, that is, when used as a far-infrared irradiator, if the output of the heater 12 fluctuates due to the temperature in the heating chamber 11a, the irradiation amount of far-infrared will also fluctuate. Not preferred. Therefore, when used as a far-infrared irradiator, the output of the heater 12 is set to a desired output among six steps by a manual changeover switch (not shown). As a result, it is possible to receive a certain amount of far infrared rays while keeping the output of the heater 12 constant. When the sauna device 10 is used as a far-infrared irradiator, the lower body from the front of the sauna body 11 is
1a, the upper body may be taken out of the heating chamber 11a and the patient may be laid down. In this case, for example, 60
Even if the heater 12 is turned off after a lapse of minutes, the far-infrared bath can be performed again just by turning on the remote switch while lying down. The output of the heater 12 at this time is an output before the heater 12 is turned off.

The enclosing wall 11 is kept energized while the heater 12 is energized.
When e is folded, the limit switch (not shown) is opened by the folded enclosure 11e, so that the power supply to the heater 12 is stopped. Furthermore, the bather can relax mentally by listening to music or the like flowing from the speakers 42 in the heating room 11a.

[0024]

As described above, according to the present invention, when the detected temperature of the heating room temperature sensor rises or falls to the set temperature of the setting switch, the control circuit controls the photocoupler, and 0 to π and π for each cycle of voltage
Since the voltage of the AC power supply is applied to the heater only for a predetermined time between 2 and 2π, the control circuit delays the generation timing of the trigger pulse output to the gate terminal of the triac when the detected temperature is higher than the set temperature. The output of the heater is reduced, and when the detected temperature is lower than the set temperature, the generation timing of the trigger pulse is advanced to increase the output of the heater. By controlling the heater in this manner, the detected temperature can be substantially maintained at the set temperature.
In addition, since the heater is not controlled by energizing and stopping the heater and is always controlled while the heater is energized, the heater can be supplied with uniform power and the far-infrared effect of the heater can be reduced. I won't let you.

The control circuit can switch the output of the heater in a plurality of stages via a photocoupler and a triac, and the control circuit compares the temperature detected by the temperature sensor in the heating chamber with the temperature set by the temperature setting switch. If the output is sequentially switched to a predetermined stage to maintain the detected temperature at the set temperature, the control circuit selects the heater output suitable for maintaining the detected temperature at the set temperature from a plurality of stages. Since the switching is performed, the pulsation of the temperature change can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram for controlling a heater of a sauna device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a sauna device including audio equipment.

FIG. 3 is a diagram showing a change in voltage of an AC power supply supplied to a heater with respect to time.

FIG. 4 is a flowchart showing the operation of heater control according to the present invention.

FIG. 5 is a diagram showing changes in the detected temperature of the heating room temperature sensor and the temperature of the center of the heating room with respect to time when the temperature setting switch is set to 77 ° C.

FIG. 6 is a diagram showing changes in the detected temperature of the heating room temperature sensor and the temperature of the center of the heating room with respect to time when the temperature setting switch is set to 52 ° C.

[Explanation of symbols]

 10 Sauna device 11a Heating room 12 Heater 13 AC power supply 14 Triac 14a Gate terminal 16 Photocoupler 27 Temperature setting switch 28 Heating room temperature sensor 32 Control circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4C094 AA01 BA18 DD35 EE32 FF02 5H323 AA40 CA02 CB02 DA01 DB04 EE01 FF01 HH02 KK05 LL13 MM04 MM11 NN01 5H420 BB02 BB12 CC04 DD03 EA05 EB05 EB26 EB32 FF26

Claims (2)

[Claims] A heater (12) connected to an AC power supply (13) for heating the inside of the heating chamber (11a), and the AC power supply (13) connected between the AC power supply (13) and the heater (12). 13) Triac that can change the timing of operation according to the phase
(14), a photocoupler (16) that outputs a trigger pulse to a gate terminal (14a) of the triac (14) and can change the operation timing of the triac (14), and the heating chamber
(11a) a temperature setting switch (27) for setting the temperature inside, and a heating chamber temperature sensor for detecting the temperature in the heating chamber (11a)
(28) and a control circuit (32) for controlling the photocoupler (16) based on a set temperature (Ts) and a detected temperature (Tr) of the temperature setting switch (27) and the heating chamber temperature sensor (28). When the detected temperature (Tr) rises or falls to the set temperature (Ts), the control circuit (32) controls the photocoupler (16), and the AC power supply ( 13) 0 of each cycle of the voltage
π and a predetermined time between π and 2π
Voltage to the heater (12), the output of the heater (12) is reduced by shortening the predetermined time, and the output of the heater (12) is increased by increasing the predetermined time. Then, the detected temperature (Tr) and the set temperature (Ts)
A sauna apparatus characterized in that the sauna apparatus is configured to be maintained at a temperature. 2. A control circuit (32) capable of switching the output of a heater (12) to a plurality of stages via a photocoupler (16) and a triac (14), wherein the control circuit (32) By comparing the detected temperature (Tr) of the sensor (28) with the set temperature (Ts) of the temperature setting switch (27) and sequentially switching the output of the heater (12) to a predetermined stage, the detected temperature (Tr) The sauna apparatus according to claim 1, wherein the temperature is maintained at the set temperature (Ts).