JPH11281218A - Freezer and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the loss of the driving circuit of a compressor or a fan of large power consumption, by arranging the drive controller of a drive means within a freezing room or between the vicinity of the air outlet of an evaporator and the freezing room. SOLUTION: An inverter 23 for a normal compressor is installed in a machine room 6 or the like, and the junction temperature of the switching element of the inverter 23 is heated to about 80 deg.C from the temperature of heat radiation from a condenser and the loss of the inverter itself of the switching element of the inverter 23. When the inverter 23 for a compressor installed within a freezing room 4 lower in chill temperature is cooled to about -23 deg.C, it becomes ON resistance one-third as large as that at 80 deg.C. If the current flowing to the main switching element is the same, the conductivity loss drops to one third, so the conversion efficiency of the inverter 23 goes up, and the efficiency of the system at large can be raised. Since the interior of the refrigerator to preserve frozen food far a short period is not less than 5 deg.C, the loss can be reduced more, according to this temperature difference, than the case of placing the inverter within the refrigerator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration air conditioner having a compressor of a refrigeration cycle and a fan of a forced ventilation system.

[0002]

2. Description of the Related Art For example, the amount of electric power generated by a refrigerator or an air conditioner (hereinafter referred to as an air conditioner) in a home is extremely large. There is a strong demand for power saving of equipment used. Therefore, refrigerators,
It is necessary to reduce the power consumption of control circuits such as a microcomputer and a power supply for controlling the drive of a refrigeration cycle including a compressor, which accounts for a large part of the power consumption of an air conditioner, and a fan for forced ventilation. These prior arts are described in Japanese Patent Application Laid-Open No. 9-79727. This uses a DC motor for the blower fan motor, uses a switching regulator as its power supply to save power, further provides a voltage variable means in the power supply, and controls the temperature inside the refrigerator by controlling the temperature inside the refrigerator. By changing the power supply voltage based on the outside air temperature information, the number of revolutions of the fan is changed,
When the outside air temperature is low or the inside temperature is low, the voltage applied to the fan is reduced to reduce the number of revolutions of the fan, thereby suppressing temperature unevenness and power consumption due to unnecessary excessive cooling.

[0003]

However, in the above-mentioned prior art, a drive circuit for a compressor or a fan which consumes a large amount of power is mainly placed in a machine room which is largely affected by the outside air. In addition, there is a problem that the power consumption of stores such as homes, factories, offices and convenience stores where such devices are placed is large, and there still remains a major problem in preventing global warming and reducing carbon dioxide emission.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a refrigeration / air-conditioning apparatus capable of greatly reducing the circuit loss of a compressor or a fan drive circuit which consumes a large amount of power. is there. Another object of the present invention is to provide a device for controlling the refrigerating cycle and the forced ventilation device, which can reduce the loss as a whole.

[0005]

According to a first aspect of the present invention, there is provided a refrigeration / air-conditioning apparatus including a compressor, a condenser, and an evaporator, wherein the refrigeration cycle circulates refrigerant, and air cooled by the evaporator of the refrigeration cycle. A refrigeration compartment for circulating the air with a fan to freeze the stored items, a driving means for driving at least one of the compressor and the fan, and a control device for controlling the driving of the driving means. Alternatively, it is arranged between the vicinity of the air outlet of the evaporator and the freezing room.

According to a second aspect of the present invention, there is provided a refrigeration / air-conditioning apparatus in which a switching element or a heat generating portion of a control device for driving and controlling a compressor or a fan is arranged between the freezing room or the vicinity of the air outlet of the evaporator and the freezing room. is there.

According to a third aspect of the present invention, a switching regulator is used as a DC stabilized power supply of the control device, and a switching element of the switching regulator is arranged between the vicinity of the air outlet of the freezing room or the evaporator and the freezing room. Things.

According to a fourth aspect of the present invention, there is provided a refrigeration cycle having a compressor, a condenser, and an evaporator for circulating a refrigerant.
A fan for forcibly circulating air to an evaporator or a condenser of the refrigeration cycle, a driving device for driving at least one of the compressor and the fan, and a control device for controlling the driving of the driving device, The control device is cooled by a suction pipe or a suction refrigerant of the compressor.

According to a fifth aspect of the present invention, there is provided a refrigeration / air-conditioning apparatus for cooling a switching element or a heat generating portion of a control device for driving and controlling a compressor or a fan by a suction pipe or a suction refrigerant of the compressor.

A refrigeration / air-conditioning apparatus according to claim 6 uses a MOSFET or an IGBT as a switching element.

In a refrigeration / air-conditioning apparatus according to a seventh aspect, a compressor or a fan is driven by a DC brushless motor.

In the refrigeration / air-conditioning apparatus according to the present invention, the IGBT is not provided with a carrier lifetime control.

A refrigeration air conditioner according to a ninth aspect has a compressor, a condenser, an evaporator and an on-off valve, and a refrigeration cycle for circulating a refrigerant, and forcibly supplying air to the evaporator or the condenser of the refrigeration cycle. A fan for circulating, a driving means for driving the compressor, the fan, and the on-off valve;
The drive means is cooled by a suction pipe or a suction refrigerant of the compressor using ET or IGBT.

According to a tenth aspect of the present invention, the refrigeration / air-conditioning apparatus uses a MOSFET for the diode of the control device or the driving means.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a refrigerator-freezer 1 according to one embodiment of the present invention. The refrigerator 1 has a refrigerator room (R room) 2 and a vegetable room (V).
Room), 4 is a freezing room (F room), 6 is a compressor 5 and cooling DC
Machine room in which fan 8 is arranged, 7 is a condenser, 9 is an evaporator,
21 is an R room damper. In this configuration, the refrigerant compressed by the compressor 5 releases heat in the condenser 7, passes through a capillary tube (not shown), evaporates in the evaporator 9, and has a low temperature. A flow of air that passes through the low-temperature evaporator 9 is created by the DC fan 10 for the inside of the refrigerator, and cool air is circulated through the cool air duct 11 to keep the inside of the refrigerator 1 at a predetermined temperature. is there.

Next, the configuration of a control device for a refrigerator-freezer according to an embodiment of the present invention will be described with reference to FIG. FIG.
Is an electronic control circuit configuration diagram for driving the compressor 5 and the like;
The electronic control circuit 12 includes a transformer 13 for generating a direct current from an AC commercial power supply, a control power supply rectifier circuit 14, a microcontroller 15 for generating a control signal for controlling the temperature of the refrigerator and driving the compressor 5, a switch 20, a transistor inverter 23, and a gate. Amplifier 24, fan drive inverter 25
The inverter 23 has a MOSFET 2
6. The free-wheeling diode 27 forms a circuit. Reference numeral 16 denotes a temperature control circuit for adjusting the temperature in the refrigerator, reference numerals 17, 18, and 19 denote temperature sensors in each room, and reference numeral 22 denotes an ice maker. The above configuration operates as follows. For the freezing room (F room) 4, the microcontroller 15 compares the current temperature data obtained by the F room sensor 17 provided in the F room with the temperature set by the temperature control circuit 16, and determines whether the current temperature is higher. If higher, the microcontroller 15 outputs a command to rotate the frequency of the compressor 5 higher.
If the set temperature is high, the compressor 5 is stopped. Here, the cooling DC fan 8 and the in-compartment DC fan 10 are substantially synchronized with the operation of the compressor 5 and the microcontroller 15.
It is operated according to the command.

The cooling DC fan 8 and the internal DC fan 1
The compressor 0 and the compressor 5 are driven using a brushless DC motor integrated with a fan and a compressor, and are driven and controlled by a compressor transistor inverter 23 and a fan transistor inverter 25, respectively.

FIG. 3 is a view for explaining a detailed configuration of the freezing room (F room) 4. The cool air cooled by the evaporator 9 and discharged from the cool air duct 11 is circulated by the fan 10 in the refrigerator. The inside of the refrigerator is kept at a predetermined temperature. The compressor driving inverter 23 is fixed to the inner wall surface inside the freezer compartment, and this inverter circuit reduces the heat loss generated by driving the compressor to -23 ° C (250 ° K) by the cool air in the refrigerator. It is cooled below. Reference numeral 28 denotes a cooling fin, which cools the compressor driving inverter 23. The compressor inverter 2
3 is fixed in the freezer 4 by the electronic substrate 29. In the configuration of the cooling fins, for example, a heat sink made of aluminum or the like having good heat transfer may be used.
The T chip may be directly fixed by soldering, or the substrate on which the chip, wiring, and other elements such as capacitors are attached may be fixed to the heat sink via insulation. In this description, an example in which the cooling fins are provided is shown. However, when the temperature of the cold air is low, the cooling fins 28 are not attached and the inverter circuit 23 is directly provided.
May be cooled.

Next, the operation which is a feature of the present invention will be described. Normally, the compressor inverter 23 is installed in the machine room 6 or the like. The junction temperature of the switching element 26 of the inverter 23 is 80 ° C. (350 ° K.) based on the heat radiation temperature from the condenser 7 and the loss of the compressor inverter itself. ) Is heated to about.

Therefore, when a MOSFET is used for the main switching element as shown in FIG. 4, conduction loss (ON resistance) of the main switching element 26 of the compressor inverter 23 is obtained.
Is 1.5 times higher than the normal temperature of 30 ° C (300 ° K). If the current flowing through the main switching element 26 is the same, the loss increases by a factor of 1.5. In the conventional case, a high-efficiency DC brushless motor is used to save power, but the conversion efficiency of the inverter 23 is reduced. Due to the decline,
The result was a decrease in system efficiency.

Therefore, as shown in FIG. 3, by installing the compressor inverter 23 in the freezing room 4 where the temperature of the cold air is low, the compressor inverter 23 is
When cooled to around 23 ° C (250 ° C), 80 ° C
(゜ K), the ON resistance becomes １ ／. As described above, if the current flowing through the main switching element is the same, the conduction loss is reduced to 1/3. Therefore, the efficiency of the entire system can be increased by increasing the conversion efficiency of the inverter 23. In general, the temperature in the freezer compartment of a home refrigerator is at most -6 ° C or lower, and the temperature is set lower than -18 ° C for long-term storage of frozen foods. Since the inside of the refrigerator for storing the refrigerated food for a short period of time has a temperature of + 5 ° C. or more, the loss can be further reduced in accordance with the temperature difference than when the inverter is provided in the refrigerator.

FIG. 5 shows a diode 27 in the inverter circuit.
FIG. 6 is a diagram showing a relationship between time and current depending on the temperature of the recovery current of FIG. This indicates that when the temperature is low, the recovery current decreases, and the switching loss of the diode 27 and the switching loss of the main switching element (MOSFET) 26 can be reduced. FIG. 6 shows the temperature characteristics of the peak current IPR of the recovery current of the diode 27 using the MOSFET. It can be seen that cooling the diode 27 reduces the peak IPR. It is known that when the peak current of the recovery decreases, the noise radiation also decreases, and it can be seen that it is advantageous for noise resistance and reduction of generated noise. In the case of a diode, a large current flows transiently when switching from the conductive state to the reverse element state.
This phenomenon occurs not only in the freewheeling diode but also in, for example, a diode used for a converter circuit and a diode used for backflow prevention. The value obtained by integrating the current value of the reverse recovery time is the reverse recovery charge, and this value depends on the configuration of the element and the characteristics such as the junction capacitance of the element.
An extremely large peak voltage is generated depending on dt and circuit conditions. In order to suppress the surge voltage at the time of commutation, when using at high temperature, consideration was given to selecting the type of element and protecting the voltage of the circuit.However, in a place where the temperature of the MOSFET diode becomes considerably lower than zero degree, Use eliminates this problem. Therefore, if the control device which is not an inverter circuit using three-phase full-wave transistor elements as shown in FIG. 2 or the diode of the rectifier circuit used for the control power supply shown in FIG. In addition, the diode circuit can be formed freely and inexpensively without considering the limitation of the spike voltage. In the above description, a free-wheeling diode is taken as an example. However, the free-wheeling diode usually has a voltage effect of 0.6 to 0.7 V. On the other hand, if a MOSFET is used, when the temperature is low, the on-resistance becomes small, and the loss is reduced.

Embodiment 2 FIG. In the first embodiment, the control device shown in FIG. 2 such as a compressor inverter is installed in the freezing room. However, the same effect can be obtained by installing the control device near the evaporator outlet. This example is shown in FIG. The electronic board 29 is fixed to the wall of the duct 11 at a position where the inverter circuit 23 is directly cooled in the ventilation duct 11 by the cooled air at the outlet of the evaporator 9. In the case of a refrigerator evaporator, the temperature of the refrigerant is lower than minus 25 ° C., and the loss is significantly reduced by directly receiving the cool air.

In the above description, an example has been shown in which a switching element such as a compressor inverter and an element of a control device such as a diode are constituted by MOSFETs. An example of this MOSFET is n
FIG. 8 shows a configuration diagram of a MOS-type field-effect transistor. On the side of the semiconductor sandwiched between both the source S and drain D electrodes in the figure, there is a channel portion having a three-layer structure of a metal electrode, a silicon oxide film and a semiconductor. Switching the current. An IGBT known as a typical example of a composite element of a bipolar transistor and a field-effect transistor having a temperature characteristic similar to that of FIG. 4 is known.
It is. This IGBT, Insuiated Gate Bip
The oiar transistor has a similar characteristic tendency, though smaller than the MOSFET, and can achieve the same effect. At that time, the loss of the IGBT is more effectively reduced if the lifetime control of the carrier is not performed. This IGBT
FIG. 9 shows an example of the configuration of FIG. It has a collector terminal, an emitter terminal, and a gate terminal, and performs switching by changing the potential of the gate terminal. The structure is MOSFE as shown
Close to T, the equivalent circuit configuration is like a bipolar transistor base driven with a field effect transistor. In other words, by utilizing the fact that the on-resistance is greatly reduced and the loss is reduced as the temperature decreases as in the element having such a configuration, the control device should be arranged at a place considerably lower than zero degree of the device used for the refrigeration cycle. As a result, the amount of heat generated from home appliances and the like is greatly reduced, and thereby environmental measures can be taken.

In the MOSFET, only one kind of carrier contributes to conduction, that is, a unipolar transistor, so that the effect of storing a minority carrier does not occur.
As a result, a turn-off is rapid, and a high-speed element of, for example, about 10 ns to several hundred ns is obtained. On the other hand, in general semiconductors, electrons and holes, ie, holes, are interposed as carriers, so that it is difficult to obtain a high-speed element that increases the switching speed.
On the other hand, in a semiconductor, Au. Pt. Since the heavy metal such as Fe can be diffused to shorten the minority carrier lifetime, shorten the reverse recovery time, and increase the switching speed, this operation can be performed in the IGBT to further shorten the turn-off time. it can. However, in this method, when the lifetime of the minority carrier is shortened, the resistivity and the forward voltage are increased. Therefore, there is a trade-off between the lifetime and the lifetime. Therefore, the switching speed of the IGBT can be increased by not controlling the lifetime, that is, by lowering the temperature without increasing the resistivity and the forward voltage. As described above, when a MOSFET is used in place of a general diode as a diode which is a semiconductor which does not perform switching because current flows only in one direction of the freewheel diode 27 of the compressor inverter 23 and other control devices, not only performance is improved but also loss reduction is further reduced. The remarkable effect is as described above.

In the above description, the compressor inverter 23 has been mainly described as a representative of the control device. However, the same effect can be obtained with the fan inverter 25 and the power supply 14. The same effect can be obtained by using an induction motor or a DC brushless motor for the compressor or fan.

Further, a switching regulator is used as a DC stabilized power supply of the control device, and the DC power obtained by rectifying the AC power as it is is transmitted from a transistor to smooth the AC induced on the secondary side of the high frequency transformer to obtain the DC. Even when the entire regulator or its switching element is disposed between the freezer compartment or the vicinity of the air outlet of the evaporator and the freezer compartment, the same effect can be obtained in the heat generating portion such as the switching element of the switching regulator.

A fan inverter circuit is built in the fan motor, and the fan motor is installed near the outlet of the evaporator, which has an effect of reducing the loss.

Embodiment 3 In the above description, the refrigerator was described. However, the same effect can be obtained with a refrigerator such as an air conditioner (air conditioner) and a showcase. FIGS. 10 and 11 show examples of an air conditioner that is an air conditioner. In the figure, 30 is an indoor fan 31, an indoor heat exchanger 3
An indoor unit having a refrigeration cycle component such as an expansion unit 2 or a capillary tube, 33 is an outdoor unit, 34 is an outdoor heat exchanger forcedly ventilated by an outdoor fan 35, 36 is an accumulator, 37 is a suction muffler, 38 Is a four-way valve which is a switching valve for switching between cooling and heating, which are the operation modes of the air conditioner, and 40 is a suction pipe. The outdoor unit and the indoor unit are connected by piping to form a refrigeration cycle. The radiating fins 28 are in direct contact with the suction pipe 40 on the suction side of the compressor, which has a low temperature during the refrigeration cycle, to cool the inverter 23. In the case of an air conditioner, the temperature and pressure of the refrigerant discharged from the compressor, condensed in the condenser, and evaporated in the evaporator vary depending on the operation mode, operation setting conditions, outside air temperature condition, load condition, type of refrigerant, etc. . For example, the temperature decreases at the evaporator outlet, but the temperature of the indoor or outdoor heat exchanger decreases depending on the operating state such as heating or cooling.
On the other hand, the temperature of the suction part of the compressor is the lowest at the saturation pressure, and varies depending on the operation mode and the temperature of the outside air, but it is about + 5 ° C to -10 ° C or less, and depending on conditions, it is -20 ° C or less. . On the other hand, in a normal air conditioner, the inverter device 23 in the outdoor unit 33 removes heat by ventilation of outside air. However, the temperature may normally reach from 30 ° C. to 100 ° C. or more at high temperature. . By utilizing the low temperature of the refrigerant, the temperature of the control device can be significantly reduced. As a result, when a MOSFET or the like is used for the switching element, the loss can be significantly reduced. In addition, the loss generated from each component and wiring in the control device is reduced, and the calorific value of the home electric appliance is reduced. As a result, the generation of carbon dioxide gas is significantly prevented, which is useful for global environmental measures.

FIG. 11 shows a configuration in which the pipe is meandering in the groove of the heat sink 28 which is a cooling fin. However, even if the pipe is installed adjacent to the compressor, the vibration of the compressor can be absorbed. There is an effect that it can be efficiently arranged in a narrow space. In the case of an air conditioner, cooling the inverter with the suction pipe of the compressor, that is, the suction gas, reduces the effect of the temperature of the outside air and increases the effect of loss reduction as compared with the conventional case. It's easy. In addition, for example, a part of or the whole wall of the pipe or muffler of the suction pipe part may be made into a cooling fin as a material having good heat transfer, or may be directly cooled by a refrigerant such as an inverter provided inside, or an accumulator instead of a muffler. It goes without saying that it is only necessary that the part is designed to have a low temperature.

In the above description, the switching element is MOS
An example in which a high-speed element such as an FET or an IGBT is used has been described. This is because, when the motor is operated at a high frequency, for example, at an audible frequency or higher, the copper loss is mainly reduced, so that the efficiency is improved in view of the total loss. In order to drive at a high frequency of 2-5 kc or more, if a bipolar transistor is used, the switching speed is low, so that high-frequency driving cannot be performed or electromagnetic noise becomes a problem. Therefore, when a high-speed element is used, the on-resistance increases, and the loss in a steady state increases. On the other hand, the high-speed element is arranged in the lowest temperature region of the refrigerant of the refrigeration cycle, and cooling is performed by using the low temperature. A device can be provided. Although the above description has been given of the examples of the refrigerator and the air conditioner, the same effect can be obtained by a device such as a dehumidifier in which a condenser and an evaporator are integrated. Also, a similar effect can be obtained by providing a control device provided in an air passage that circulates cooling air disposed inside a showcase such as a convenience store or a supermarket, in a portion of the refrigerant circuit where the refrigerant temperature is low. On the other hand, in the case of a refrigeration cycle having an ice heat storage device, by cooling with a latent heat storage material, cooling can be performed at a constant low temperature, and the temperature condition of the control device can be kept low and constant, so that not only loss reduction but also This can lead to stable performance. In addition, by protecting the inverter etc. from the surroundings in the air path and outdoor unit with a case covered with a sheet metal formed integrally with the cooling fins, further protection against radiation noise from electrical components is obtained and shielded A device with good effects can be obtained. According to the present invention, the switching element has been mainly described, but any heating element such as a reactor may be used, and this can be cooled by the cool air in the region where the temperature of the refrigerant in the refrigeration cycle is the lowest. It is valid. Furthermore, according to the refrigerator / air conditioner such as a refrigerator-freezer, an air conditioner, a dehumidifier, and a freezer warehouse of the present invention, a switching element or a diode is used regardless of whether any circuit other than the above-described control circuit is used as a control device or a driving unit. As long as the temperature can be kept low, the life can be prolonged, and a device with low power consumption, low radiation noise, high performance and high reliability can be provided.

[0032]

According to the present invention, a refrigerating cycle having a compressor, a condenser, and an evaporator and circulating a refrigerant, and the air cooled by the evaporator of the refrigerating cycle is circulated by a fan to store goods. A driving unit for driving at least one of the compressor and the fan, and a control device for controlling the driving of the driving unit. The control device is provided from the vicinity of the air outlet of the freezing chamber or the evaporator. Since the compressor inverter disposed between the freezer and the freezer is installed in the freezer, the loss of the control device can be greatly reduced, and an efficient device can be obtained.

According to the present invention, since the switching element or the heat generating portion of the control device for controlling the driving of the compressor or the fan is arranged between the freezer compartment or the vicinity of the air outlet of the evaporator and the freezer compartment, the main component of the control device is provided. Loss can be reduced and an efficient device can be obtained.

According to the present invention, a switching regulator is used as the DC stabilized power supply of the control device, and the switching element of the switching regulator is arranged between the freezing room or the vicinity of the air outlet of the evaporator and the freezing room. Power loss can be reduced, and an efficient device can be obtained.

According to the present invention, a refrigeration cycle having a compressor, a condenser, and an evaporator for circulating a refrigerant, a fan forcibly circulating air to an evaporator or a condenser of the refrigeration cycle, A drive unit for driving at least one of the compressor and the fan, and a control device for controlling the drive of the drive unit. Since the control device is cooled by a suction pipe or a suction refrigerant of the compressor, the temperature range of the refrigerant is low. Thus, the control device can be cooled, the loss can be greatly reduced, and a high-quality device can be obtained.

According to the present invention, since the switching element or the heat generating portion of the control device for controlling the drive of the compressor or the fan is cooled by the suction pipe or the suction refrigerant of the compressor, the main loss of the control device can be reduced, and the efficiency of the control device can be reduced. Good equipment is obtained.

According to the present invention, the switching element has the MO
Since the SFET or the IGBT is used, the lower the temperature at which the switching element is cooled, the lower the loss of the element becomes, and the loss can be greatly reduced in combination with the refrigeration cycle.

According to the present invention, the compressor or fan is connected to DC
Since the apparatus is driven by a brushless motor, a device with high efficiency can be obtained.

According to the present invention, since the carrier lifetime control is not performed on the IGBT, the loss of the device is reduced and an efficient device can be obtained.

According to the present invention, a refrigeration cycle having a compressor, a condenser, an evaporator and an on-off valve for circulating a refrigerant, and a fan forcibly circulating air to the evaporator or the condenser of the refrigeration cycle Drive means for driving the compressor, the fan, and the on-off valve; and a MOSFET or IGBT is used for the drive means, and the drive means is cooled by a suction pipe or a suction refrigerant of the compressor. Loss can be reduced, and an efficient and highly reliable device can be obtained.

According to the present invention, since a MOSFET is used for the diode of the control device or the driving means, the loss can be reduced as a whole regardless of the circuit used, and a device having good performance can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a control block diagram of the refrigerator-freezer according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a detailed configuration of a freezer compartment of the refrigerator according to the embodiment of the present invention.

FIG. 4 is a MOSFET according to an embodiment of the present invention;
FIG. 3 is a diagram showing temperature characteristics of the present invention.

FIG. 5 is a diagram showing a relationship between time and current depending on temperature of a diode recovery current according to an embodiment of the present invention.

FIG. 6 is a diagram showing temperature characteristics at a peak current of a diode recovery current according to an embodiment of the present invention.

FIG. 7 is an explanatory sectional view of a freezer compartment of a refrigerator according to another embodiment of the present invention.

FIG. 8 shows a MOSFE according to another embodiment of the present invention.
FIG. 3 is a diagram illustrating the principle of T.

FIG. 9 is a diagram illustrating a structure and an equivalent circuit of an IGBT according to another embodiment of the present invention.

FIG. 10 is a diagram illustrating a refrigeration cycle of an air conditioner according to another embodiment of the present invention.

FIG. 11 is a diagram illustrating an inverter provided between a compressor and a muffler of an air conditioner according to another embodiment of the present invention.

[Explanation of symbols]

1 freezer refrigerator, 2 refrigerator (R room), 3 vegetable (V) room, 4 freezer room (F room), 5 compressor, 6
Machine room, 7 condenser, 8 cooling DC fan,
9 Evaporator, 10 DC fan for storage, 11 ventilation duct, 12 electronic control circuit, 13 transformer for power supply, 14 control power supply, 15 microcontroller, 16 temperature control circuit, 17 F room sensor, 18
R room sensor, 19 outside air sensor, 20 switch, 21 R room damper, 22 ice maker,
23 inverter for driving a compressor, 24 gate amplifier (for driving a compressor), 25 inverter for driving a fan, 26 MOSFET, 27 freewheeling diode,
28 cooling fins, 29 visual substrate, 30 indoor unit, 32 indoor heat exchanger, 33 outdoor unit,
34 outdoor heat exchanger, 40 suction pipes.

Claims (10)

[Claims] 1. A refrigeration cycle having a compressor, a condenser, and an evaporator and circulating a refrigerant, and a refrigeration chamber for circulating air cooled by an evaporator of the refrigeration cycle with a fan to freeze stored articles. A drive unit for driving at least one of the compressor and the fan; and a control device for controlling the drive of the drive unit. The control device is provided from the vicinity of the air outlet of the freezing room or the evaporator to the freezing room. A refrigeration / air-conditioning device that is arranged between the two. 2. The cooling device according to claim 1, wherein the switching element or the heat generating portion of the control device for controlling the driving of the compressor or the fan is arranged between the freezing room or the vicinity of the air outlet of the evaporator and the freezing room. Refrigeration and air conditioning equipment. 3. A switching regulator is used as a stabilized DC power supply of the control device, and a switching element of the switching regulator is disposed between the freezing room or the vicinity of an air outlet of an evaporator and the freezing room. Item 7. A refrigeration / air-conditioning apparatus according to Item 1. 4. A refrigeration cycle having a compressor, a condenser, and an evaporator for circulating a refrigerant, a fan forcibly circulating air to an evaporator or a condenser of the refrigeration cycle, and the compressor and the fan. A refrigeration / air-conditioning system comprising: a driving unit for driving at least one of the above; and a control device for controlling the driving of the driving unit, wherein the control device is cooled by a suction pipe or a suction refrigerant of the compressor. . 5. The refrigeration / air-conditioning apparatus according to claim 4, wherein a switching element or a heat generating portion of a control device for controlling driving of the compressor or the fan is cooled by a suction pipe or a suction refrigerant of the compressor. 6. A switching element comprising a MOSFET or an I
6. The method according to claim 2, wherein GBT is used.
The refrigeration / air-conditioning device as described. 7. The refrigeration / air-conditioning apparatus according to claim 1, wherein the compressor or the fan is driven by a DC brushless motor. 8. The IGBT according to claim 6, wherein a carrier lifetime control is not performed.
The refrigeration / air-conditioning device as described. 9. A refrigeration cycle having a compressor, a condenser, an evaporator and an on-off valve for circulating a refrigerant, a fan forcibly circulating air to an evaporator or a condenser of the refrigeration cycle, and A refrigerating / air-conditioning apparatus comprising: a driving unit for driving a compressor, a fan, and an on-off valve; and a MOSFET or an IGBT for the driving unit, and the driving unit is cooled by a suction pipe or a suction refrigerant of the compressor. 10. The refrigeration / air-conditioning apparatus according to claim 1, wherein a MOSFET is used for the diode of the control device or the driving means.