JPH10288438A - Cold storing apparatus and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold storing apparatus to effect easy cold storage and preservation of polished rice at a home and a farmhouse and reduce a running cost. SOLUTION: In a cold storing rice chest 1 wherein a containing chamber 20 in which cereals are charged for holding is cooled by Peltier cooling units 11 and 12 and a cold storage temperature is held, a switch SW20 is provided to turn ON and OFF of the AC side of an AC/DC converter 31 to feed power by converting AC to DC. The AC/DC converter 31 is caused to effect ON and OFF control togetherwith the Peltier cooling units 11 and 12 and by saving a power consumed by the AC/DC converter 31, the cold storage rice chest to reduce the running cost and be easily utilized is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration apparatus using a Peltier cooling unit, and more particularly to a refrigeration apparatus suitable for refrigerated storage of grains having an input section and a payout section.

[0002]

2. Description of the Related Art In recent years, there have been proposed cold-insulated rice bins for easily obtaining fresh grains such as white rice and brown rice even in the summer season when white rice is easily damaged, and insulated storage boxes for affordable brown rice. ing. In addition, a cooling unit that circulates refrigerant above these rice bins and insulated storages is installed to cool the inside of the rice bins and storages, making it an environment more suitable for storing grains such as white rice and brown rice. Have been proposed.

[0003]

SUMMARY OF THE INVENTION In order to make it easy for ordinary households and farmers to easily purchase and use rice bins and grain storages equipped with a cooling unit, they can be provided at a low price. It is desirable to provide a running cost that is as low as possible. Therefore, the size of the cooling unit can be reduced to reduce the size of the rice bin and the whole grain storage box. It is being considered for use in storage.

FIG. 6 shows two Peltier cooling units 11.
The example of the refrigerated rice bin 1 which can cool the storage 20 using FIGS. This refrigerated rice bin 1 has a storage 20
The rice can be refrigerated by putting white rice into it, so that the periphery of the storage 20 is covered with a heat insulating material 29, and the Peltier cooling units 11 and 12 absorb heat in the storage to reduce the temperature in the storage. It can be lowered. DC power for operating the Peltier elements is supplied to the respective Peltier cooling units 11 and 12 from the control device 30. The control device 30 includes a converter 31 for converting AC power for home use into DC power, switches SW11 and SW12 for turning on and off DC power supplied to the cooling units 11 and 12, and switches SW11 and SW12. Control unit 32 for controlling
It has. The control unit 32 includes a temperature sensor 33
The temperature T in the storage 20 is detected by using the Peltier cooling units 11 and 1 using the switches SW11 and SW12 such that the temperature T in the storage is within a predetermined range.
2 is turned on and off. When the inside of the refrigerator is cooled after the white rice is put in the refrigerator and the temperature in the refrigerator is lowered to an appropriate refrigeration temperature, the temperature T in the refrigerator is controlled so as to have an appropriate temperature cycle or speed in order to avoid dew condensation. It is necessary to adjust, the control unit 32 switches SW11 and SW1
2 can also be used to control such a cooling process.

[0005] The refrigerated rice bin 1 employing the Peltier cooling units 11 and 12 can be made compact as a whole, and the configuration of the cooling system can be made very simple because no refrigerant is used. Therefore, it is possible to provide a low-cost refrigerated rice bottle that can be easily used by households and farmers. However, Peltier cooling unit 1
The power consumed by the AC / DC converter 31 for supplying DC power to the DC power supplies 1 and 12 is large, and the power consumed by the AC / DC converter is comparable to the power consumed by both the Peltier cooling units 11 and 12. At 31 they are self-consumed. Then, when the power consumption reaches the refrigeration temperature range when the internal temperature T of the storage is reached, the Peltier cooling units 11 and 1
Even in the situation where the operation stop of 2 is repeated, the load is continuously applied, so that the electric power consumed by the refrigerated rice bottle increases. In addition, the power consumed by the AC / DC converter 31 becomes heat and is released into the housing of the refrigerated rice bin 1, so that the temperature inside the housing rises and is covered with the heat insulating material 29. This is one factor that raises the temperature in the refrigerator.

Accordingly, an object of the present invention is to provide a refrigeration apparatus that reduces the power consumed by the AC / DC converter 31 and has a low running cost. It is another object of the present invention to provide a refrigeration apparatus that is compact and employs a Peltier cooling unit and that can reduce daily running costs. It is still another object of the present invention to provide a refrigeration apparatus that can stably perform detailed temperature control from rice charging to refrigeration and can keep running costs low, and a control method thereof.

[0007]

Therefore, in the present invention, instead of turning on / off the DC side supplied to each Peltier cooling unit, the AC side supplied to the AC / DC converter is turned on / off. The cooling unit is controlled. As a result, the AC / DC converter can also be controlled to be turned on and off, so that when the Peltier cooling unit is not moving, power consumption in the AC / DC converter can be eliminated, and power consumption can be greatly reduced. In addition, since the heat generated from the AC / DC converter can be suppressed, the heat generated from the refrigerator can be suppressed, the rise in the temperature of the storage can be suppressed, and the power consumption can be further reduced. That is, the refrigeration apparatus of the present invention includes a storage unit that stores the object to be refrigerated, a Peltier cooling unit that cools the storage unit, and a power supply unit that converts AC into DC and supplies the DC to the Peltier cooling unit. And a switch unit capable of turning on and off the alternating current supplied to the power supply unit based on the temperature of the storage unit.

[0008] The power supply unit for performing AC / DC conversion is normally operated continuously from the viewpoint of securing a stable voltage and preventing the effect of inrush current when power is supplied. However, the inventors of the present application noted that in the refrigeration apparatus, once the temperature in the refrigerator was within the refrigeration temperature range, the temperature was normally kept stable, and the interval at which the cooling unit was turned on and off was extremely long. It has been found that even if the power supply unit is shut down when the unit is shut down, it can be operated with little effect on the Peltier cooling unit. In particular, in a refrigeration unit for cereals in which a charging unit and a dispensing unit are formed in a storage unit, a refrigeration temperature range is wide. Therefore, after operating the Peltier cooling unit and once lowering the internal temperature T to 15 ° C, the Peltier cooling unit can be stopped until the internal temperature T exceeds 20 ° C. In a situation where the condition is stable after cooling, the interval at which the Peltier cooling unit is turned on and off becomes very long. Therefore, even if the power supply unit having the AC / DC conversion function is turned on and off, the frequency does not increase so much, so that the control can be performed without substantially affecting the durability of the Peltier cooling unit and the power supply unit itself. Further, since the heat generation in the refrigerator can be suppressed by stopping the power supply unit, the timing at which the Peltier cooling unit and the power supply unit operate can be further extended.

When the Peltier cooling unit is turned on and off at short intervals to control the rate of decrease in the temperature of the storage, it is desirable to avoid turning the power supply unit on and off at short intervals. Therefore, by providing a switch unit that can turn on and off the DC supplied to the Peltier cooling unit, it is possible to control only the Peltier cooling unit while the power supply unit is continuously operated. This DC side switch unit is particularly effective when a plurality of Peltier cooling units are provided, and is suitable for cooling the storage at an appropriate temperature reduction rate or temperature cycle by switching the cooling capacity. . This refrigerator can be controlled by a control method having the following two modes.

[0010] 1. A first mode for turning on / off a DC converted from an AC supplied from a power supply unit to the Peltier cooling unit.

2. A second mode for turning on and off the alternating current supplied to the power supply unit.

A refrigerator having such an AC-side switch section and a DC-side switch section, or a refrigerator having first and second modes, turns on and off DC power when fine temperature control is required. By doing so, it is possible to control only the Peltier cooling unit in a state where the power supply unit having the AC / DC conversion function is operated, and at a relatively short interval without burdening the power supply unit and the Peltier cooling unit. Can be controlled. On the other hand, when it is not necessary to perform fine temperature control after the refrigerator temperature has been reached, it is possible to control the AC power including the power supply unit by turning on and off the AC power. And the heat generated inside the refrigeration apparatus is also suppressed, so that the running cost can be greatly reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerated rice bin apparatus provided with a Peltier cooling unit according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the appearance of the chilled rice bin device of this embodiment. FIG. 2 is a vertical sectional view showing a schematic configuration of the chilled rice bin device of this embodiment.
Further, a schematic configuration of a refrigerated rice bin device is shown using a cross-sectional view.

As shown in these figures, a refrigerated rice bin device (rice bin) 1 of this embodiment has a rectangular parallelepiped housing 2 which is long in the vertical direction, and a lid 3 which can be opened and closed is provided above the housing 2. Have been. And when you open the lid 3,
An introduction port 21 for introducing white rice into the storage 20 appears. The storage 20 of the present embodiment is a hollow space extending in a vertically rectangular parallelepiped shape surrounded by a relatively thin metal plate, and a payout portion 22 in which a space between walls is gradually narrowed in a tapered shape is provided below the hollow space. The tip is connected to the weighing device 4. Weighing device 4
Can be operated from the front panel 2a of the housing 2, and the weighed rice enters a container 5 for taking out rice arranged on the lower side of the weighing device 4, and a user can remove an appropriate amount of white rice. The lid 3 can be taken out of the storage 20 without opening it. Further, a Peltier cooling device 10 for cooling the storage unit 20 is disposed on the rear panel 2b side of the housing 2, and a control device 30 for controlling the Peltier cooling device 10 is disposed below the Peltier cooling device. ing.

In the rice bottle 1 of this embodiment, a layer 28 of air cooled by the heat absorbing fins 13 of the Peltier cooling device 10 is formed around the storage 20, and a heat insulating wall 29 is formed around the circulating layer 28 of the cool air. Is provided. Therefore, the air cooled by the Peltier cooling device 10 serves as a medium,
Is gradually cooled from the entire outside to absorb the heat of the white rice 8 put in the storage 20 and the inside, so that the temperature T in the storage 20 can be lowered. Spacers 29a are arranged at a predetermined interval between the heat insulating wall 29 and the storage case 20, thereby forming a circulation layer 28 at an appropriate interval between the heat insulating wall 29 and the storage case 20, and cool air is removed. It can be circulated. The upper portion of the housing 2, the lid 3 of the storage 20, and the payout portion 22 of the storage 20 are covered with a heat insulating material 29, and the vertical direction of the storage 20 is substantially sealed by the heat insulating material 29. It has become. For this reason, the storage 20 is thermally shielded from the outside world, and furthermore, the cool air in the circulation layer 28 does not leak outside.

As shown in FIG. 3, the Peltier cooling device 10 of the present embodiment includes a heat absorbing fin 13 installed in a circulating layer 28,
A heat radiation fin 14 is provided facing the rear surface 2a of the housing 2. The heat absorption fin 13 and the heat radiation fin 14 are connected by two Peltier element units (Peltier cooling units) 11 and 12. further,
Two circulating fans 15 and 16 are arranged above the heat radiating fins 14 so that air outside the housing 2 is forcibly circulated to the heat radiating fins 14 so that heat radiation efficiency can be increased.

FIG. 4 is a block diagram showing a schematic control configuration of the rice bin 1 of this embodiment. The control device 30 of the rice bin 1 of the present example is a Peltier cooling device 1 using a home AC power supply.
0, so that an AC / DC converter 31 serving as a power supply unit converts an AC 39 into a DC 38 to convert the Peltier cooling units 11 and 1 into respective units.
2 is supplied. A part of the DC power supplied from AC / DC converter 31 is supplied to circulation fans 15 and 1
6 and can be driven together with the Peltier cooling units 11 and 12. Further, the control device 30 of the present embodiment applies the DC power supplied to the respective Peltier cooling units 11 and 12 to the DC-side switches SW11 and SW12 that can be individually turned on and off, and is supplied to the AC / DC converter 31. An AC-side switch SW20 that can turn on and off the AC power collectively is provided. Then, these switches SW11, SW1
2 and the SW 20 are operated by the control unit 32. The control unit 32 stores the storage 20
Temperature T or the temperature associated therewith with sensor 3
3 has the function of controlling the internal temperature T according to an appropriate temperature range, cooling rate or cooling cycle,
Depending on the control situation, the Peltier cooling units 11 and 12 can be controlled by the DC side switches SW11 and SW12, and both Peltier cooling units 11 and 12 can be controlled collectively by the AC side switch SW20.

FIG. 5 shows an example of the control of the rice bin 1 of the present embodiment. When the white rice 8 is put into the storage 20 in step 51, first, in step 52, a cooling process of taking heat from the storage 20 and the white rice 8 to cool the rice 20 to a temperature range suitable for refrigeration is started. In this cooling process, if the storage 20 is rapidly cooled, the surface of the wall surface and the surface of the white rice is dewed and the surface of the white rice becomes wet, which causes the quality to deteriorate and causes mold and the like. Become. Also, if the water in the storage is drained and discharged to the outside of the storage, it will cause deterioration of the taste of rice, and the storage will be very dry and crack the surface of the white rice. The quality will be reduced. On the other hand, if the speed of cooling the storage is too low, it is exposed to high temperatures, which may promote the occurrence of pests. For this reason, it is desirable to lower the internal temperature T as quickly as possible in a situation where the above-mentioned problems do not occur. As described above, in the cooling process of step 52, it is necessary to lower the internal temperature T at an appropriate rate or to lower the internal temperature T by an appropriate temperature cycle in which cooling and temperature holding are repeated. Therefore, in step 52, the control unit 32 of this example turns on the AC-side switch SW20 and turns on the DC-side switch SW1.
A control mode (mode 1) for controlling ON / OFF of the SW 1 and the SW 12 is adopted so that the internal temperature T of the storage 20 can be lowered with an appropriate temperature gradient or temperature cycle.

When the control of the mode 1 is adopted, the switch SW20 on the AC side is always on, so that A
The C / DC converter 31 is always operating, and the AC / DC
DC power whose voltage or the like is almost stable is supplied from the converter 31 to the respective Peltier cooling units 11 and 12. Therefore, even if the Peltier cooling units 11 and 12 are controlled on / off simultaneously or individually by using the switches SW11 and SW12 on the DC side, no large voltage fluctuation or inrush current occurs. For this reason, the Peltier cooling units 11 and 12 can be controlled to be turned on / off in a short cycle or at a short timing, so that a predetermined cooling performance can be obtained quickly. Further, since stable power is supplied, on / off control can be performed in a short cycle without significantly affecting the durability and life of these units 11 and 12. In the rice bin 1 of this example,
By turning on the SW 20, the circulating fans 15 and 16 are in the operating state.
Can be used with high cooling efficiency.

In step 53, the temperature T in the storage of the storage 20
Reaches the lower limit value T2 of the refrigeration temperature range, next, the inside temperature T of the storage 20 is reduced to the refrigeration temperature range, for example, 15 to 2
Move to the holding process of holding at 0 ° C. In this holding process, first, at step 54, whether or not new white rice has been introduced is detected by, for example, opening and closing of the lid 3. If the white rice has been introduced, the cooling process described above needs to be performed, so the process proceeds to step 52. On the other hand, if the holding process is to be performed as it is, the internal temperature T
Is higher than or equal to the upper limit T1 of the refrigeration temperature range. If the internal temperature T exceeds the upper limit T1,
It is necessary to cool the inside of the storage 20. Therefore, in step 57, the switch SW20 on the AC side is turned on to put the Peltier cooling units 11 and 12 into the operating state. In this step 57, the switches SW11 and SW12 on the DC side are fixed to ON, and both switches of the Peltier cooling unit 1 are turned on by the switch SW20 on the AC side.
1 and 12 can be controlled.

If the inside temperature T is equal to or lower than the upper limit T1 in step 55, it is checked in step 56 whether the inside temperature T has reached the lower limit T2 of the refrigeration temperature range. If the inside temperature T has reached the lower limit value T2, step 5
At step 8, the switch SW20 on the AC side is turned off, and both Peltier cooling units 11 and 12 are stopped. By turning off the switch SW20 on the AC side, the Peltier cooling units 11 and 12 can be stopped,
The AC / DC converter 31 can also be stopped. Therefore, the control device 30 of the present example uses the switch S on the DC side in the holding process.
By adopting a control mode (mode 2) in which W11 and SW12 are turned on and the switch SW20 on the AC side is turned on / off, not only the power consumed by the Peltier cooling device 10 but also the AC / DC converter 31 Power consumption is also reduced. In addition, in the rice bin 1 of the present example, by stopping the AC / DC converter 31, the circulation fans 15 and 16 are also stopped, so that the power consumed by the fans is automatically reduced. Power consumption can be reduced.

In step 56, the internal temperature T is set to the lower limit value T2.
If not, the storage is being cooled using Peltier cooling units 11 and 12, or
This is a state in which the temperature inside the refrigerator once reaches the lower limit value T2 and the refrigerator is kept in the refrigerator temperature range. Therefore, the process returns to step 54 as it is, and the holding process as described above is repeated.

As described above, the rice bin 1 of the present embodiment includes the storage 2
In the holding process for maintaining the internal temperature T of 0 in a predetermined temperature range, the switches SW11 and SW1 on the DC side are used.
In addition to the switch 2, a switch SW20 is provided on the AC side, and the Peltier cooling units 11 and 12 are operated by operating the switch SW20 on the AC side. In refrigerators that use a Peltier cooling unit, the temperature of the storage is controlled by turning the Peltier cooling unit on or off, or by controlling the DC voltage supplied to the Peltier cooling unit to change the capacity of the Peltier cooling unit. However, in consideration of the cost of a power supply device capable of variably controlling the voltage, on-off control is often used. Even when such ON / OFF control is performed, the AC / DC converter is continuously operated irrespective of the control of the Peltier cooling unit for the purpose of securing stable power. Therefore, when an AC / DC converter with normal efficiency is employed, power approximately equal to the power consumed by the Peltier cooling unit is consumed by the AC / DC converter.
On the other hand, in the rice bin 1 of this example, a switch is provided on the AC side, and the AC / DC converter 31 can be stopped.
Power consumption can be significantly reduced. Further, while the Peltier cooling units 11 and 12 are stopped, A
When the C / DC converter 31 is also stopped, the AC / DC
Since heat generation from the converter 31 can be prevented, the housing 2
Can also suppress the rise in internal temperature. Therefore, the temperature in the housing, which causes a rise in the temperature of the housing, can be kept low, so that the frequency of starting the Peltier cooling unit in the holding process is reduced, and power consumption can also be suppressed in this regard. Thus, the rice bin 1 of this example
By providing the switch SW20 on the AC side and performing switching, it is possible to greatly reduce the running cost during normal operation. Further, since heat generation can be suppressed, it is possible to install refrigerated rice bottles in a narrow space such as a corner of a room or a warehouse, and it is possible to provide refrigerated rice bottles that can be easily used by ordinary households and farmers.

Further, the refrigeration apparatus of the present embodiment is a rice bin for storing cereals, and can set a refrigeration temperature range having an allowable range close to 5 ° C. in the holding process. Further, it is possible to adopt a control method in which when the in-compartment temperature T reaches the upper limit T1 of the refrigeration temperature range, it is cooled to the lower limit T2 of the refrigeration temperature range at once, and stops when the temperature reaches the lower limit T2. For this reason, once the Peltier cooling units 11 and 12 operate, the upper limit temperature T1
To the lower limit temperature T2, and then stop until the internal temperature T reaches the upper limit temperature T1. As described above, in a grain refrigerated storage that stores not only white rice but also brown rice and other grains, the refrigeration temperature range can be set broadly, so that the interval between the start and stop of the cooling unit can be extended. Therefore, when the Peltier cooling unit starts and stops, the AC
By turning on / off the / DC converter 31, even if a slight voltage fluctuation or inrush current occurs at the beginning of the start of the Peltier cooling unit, its frequency is very small, so that the influence on the durability of the Peltier cooling unit is hardly affected. Absent.

Further, in the control device 30 of the present embodiment,
In a cooling process in which the Peltier cooling units 11 and 12 may be frequently turned on and off, control in mode 1 is performed, that is, the switches SW11 and SW on the DC side are used.
At 12 each Peltier cooling unit 11 and 12
Can be controlled. Therefore, in a situation where the ON / OFF intervals of the Peltier cooling units 11 and 12 are short, the AC / DC converter 31 continues to operate without stopping. Therefore, stable power is supplied to units 11 and 1
2, the operation of the Peltier cooling units 11 and 12 can be performed with little load even if the operation and stoppage of the Peltier cooling units 11 and 12 become frequent.

In the above description, the present invention has been described by taking as an example a rice bin 1 capable of refrigerated storage of white rice, but is not limited to white rice.
Of course, the present invention can be applied to a refrigeration apparatus that can refrigerate and store other grains such as brown rice and wheat. Further, the configuration of the refrigerated rice bin is not limited to this example, and the present invention can be applied to refrigeration devices having various configurations using a Peltier cooling unit, for example,
The present invention can be applied to a type in which a heat absorbing fin is exposed in a refrigerator or a type in which a Peltier cooling unit is attached to a lid. Further, in this example, a refrigerated rice bin of a type in which a storage is cooled using two Peltier cooling units is described as an example, but it is of course possible to use three or more Peltier cooling units, ,
Needless to say, the present invention can be applied to a refrigerator having one Peltier cooling unit. In a refrigeration apparatus such as a small refrigerated rice bin, which has a short cooling period and a long period of maintaining the temperature in the refrigerator within the refrigeration temperature range, the frequency of turning on and off the Peltier cooling unit during the cooling period is low. Not so much. Therefore, even during the cooling period, the switch SW on the AC side of the AC / DC converter 31
Even if the control is carried out collectively with 20, the durability of the Peltier cooling unit is hardly affected, and all the controls can be performed only by the switch SW20. It can be provided by.

Further, the present invention is not limited to a refrigeration apparatus for grain, but is suitable for a refrigerator having a relatively wide refrigeration temperature range and a long interval between operation and stoppage of the Peltier cooling apparatus. Can significantly reduce the running cost.

[0028]

As described above, the refrigeration apparatus according to the present invention is capable of refrigeration of refrigerated objects such as grains put in the storage section by using the Peltier cooling unit, and turns on and off the Peltier cooling unit. When the interval can be set long, the AC side of the power supply unit that converts AC into DC and supplies it to the Peltier cooling unit is switched so that the power supply unit can be turned on and off together with the Peltier cooling unit. Thus, while the Peltier cooling unit is stopped, the power supply unit is also stopped, so that the power consumed by the power supply unit can be reduced. In particular, a refrigeration apparatus suitable for cereals is controlled such that once cooled, the refrigeration temperature is maintained within the refrigeration temperature range until the grains in the storage unit are consumed. For this reason, during this holding period, the power supply unit and the Peltier cooling unit are also controlled to be turned on and off, so that the power consumption can be significantly reduced and the running cost can be reduced. Therefore, it can be easily used by ordinary households and farmers without cost,
It is possible to provide a refrigerator that can maintain the quality of white rice and other cereals for a long period of time even in high temperature conditions such as summer, and can easily obtain delicious white rice or other cereals at any time.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a refrigerated rice bin according to the present invention.

FIG. 2 is a longitudinal sectional view showing a schematic configuration of the refrigerated rice bin shown in FIG.

FIG. 3 is a cross-sectional view showing a schematic configuration of the refrigerated rice bin shown in FIG.

FIG. 4 is a block diagram showing a control configuration of the refrigerated rice bin shown in FIG.

FIG. 5 is a flowchart showing an example of a control method of the refrigerated rice bin shown in FIG.

FIG. 6 is a block diagram showing an example of a refrigerated rice bin provided with a switch only on the DC side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rice bin apparatus 2 Housing 3 Opening / closing lid 8 White rice 10 Peltier cooling device 11, 12 Peltier cooling unit 13 Heat absorption fin 14 Heat radiation fin 15, 16 Circulation fan 20 Storage 21 Input port 22 Discharge port 30 Control device 31 AC / DC converter 32 Control unit 38 DC 39 AC SW11, SW12 DC side switch SW20 AC side switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jun Takahashi 1000 Toyoshina, Toyoshina-cho, Minami-Azumi-gun, Nagano Prefecture, Japan GAC Co., Ltd.

Claims (5)

[Claims] 1. A storage unit for storing an object to be refrigerated, a Peltier cooling unit for cooling the storage unit, a power supply unit for supplying alternating current to direct current to the Peltier cooling unit, and a power supply unit for the storage unit. A switch unit that can turn on and off the alternating current supplied to the power supply unit based on the temperature. 2. The refrigeration apparatus according to claim 1, wherein the storage section includes an input section and a payout section. 3. The refrigeration apparatus according to claim 1, further comprising a switch unit capable of turning on and off a direct current supplied to the Peltier cooling unit. 4. The refrigerator according to claim 3, further comprising a plurality of Peltier cooling units. 5. A method for controlling a refrigerator that can cool a storage unit for storing a cold storage object by at least one Peltier cooling unit, wherein an alternating current supplied from a power supply unit to the Peltier cooling unit is converted. A control method for a refrigerator, comprising: a first mode for turning on and off a direct current; and a second mode for turning on and off an alternating current supplied to the power supply unit.