CN116367494A - Cooling system of power module and control method thereof - Google Patents

Abstract

The invention provides a cooling system of a power module and a control method thereof, wherein the cooling system of the power module comprises: refrigerating system, keep apart heat transfer system and power module, refrigerating system includes evaporimeter and water collector, keep apart heat transfer system for with refrigerating system keeps apart each other's circulation pipeline system, keep apart heat transfer system includes cooling device, power module set up in keep apart heat transfer system, just power module with cooling device passes through the pipeline intercommunication, cooling device set up in the inside comdenstion water of water collector, promptly cooling device can with the comdenstion water carries out heat transfer. According to the invention, the physical isolation between the power module and the refrigerating system is effectively realized, and the cold energy of outdoor cold air is prevented from being conducted to the IPM intelligent power module through the refrigerating system, so that the condensation phenomenon around the IPM intelligent power module is prevented.

Description

Cooling system of power module and control method thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to a cooling system of a power module and a control method thereof.

Background

With the wide application of 4G and the gradual popularization of 5G, the heating value of various data processing devices is larger and larger, and the requirements of the data center on the refrigerating capacity and energy conservation of the air conditioning devices are also higher and larger.

The outdoor natural cold source in transitional seasons and cold winter is adopted for cooling the data center, so that the running cost of air conditioning equipment can be greatly reduced, a fluorine pump air conditioner is commonly adopted, a fluorine pump mode is started in winter, the running of a compressor is stopped, the fluorine pump is used for driving a refrigerant to realize the refrigerating running of a heat pipe, and the running cost of the equipment is greatly reduced.

Due to the change of the heat load of the data center and the change of the outdoor environment temperature, the refrigerating capacity output of the air conditioner of the data center machine room needs to be correspondingly and intelligently adjusted and controlled so as to meet the requirements of the data center on the air conditioning constant temperature and humidity, and most of the currently mainstream variable capacity output refrigerating systems adopt variable frequency control, such as a variable frequency compressor, a direct current speed regulation fan and the like.

The variable-frequency compression refrigeration cycle system combined with the fluorine pump cycle is generally provided with an IPM intelligent power module with relatively large heating value. Along with the increasing heating value of the intelligent power module, the requirement on a heat dissipation system of the intelligent power module is also higher, the transverse thermal diffusivity of the intelligent power module on the market is poor, the heat capacity is small, and when the intelligent power module starts to work instantly, a power chip (such as an IGBT chip, an FRD chip or an MOS chip) can generate larger heat, and the temperature of the IGBT chip, the FRD chip or the MOS chip is suddenly increased to damage the power chip. The calorific capacity of intelligent power module often changes, but many times do not carry out accurate control to the cooling fluid when the design, lead to intelligent power module's operating temperature fluctuation to be great, appear overtemperature or surface temperature to be less than air dew point temperature easily, and surface temperature is less than air dew point temperature and forms the condensate water on the radiator surface easily, this causes serious security threat to the controller.

Because the electric power used by the fluorine pump circulation is much smaller than that used by the compression refrigeration circulation, the heating value of the power module is also smaller, and accordingly, the flow rate of cooling fluid of the power module can be much smaller; the power module does not participate in the working operation even when the fluorine pump circulates, i.e. no cooling is required. However, when the outdoor environment temperature is very low, the temperature of the outdoor liquid refrigerant pumped by the fluorine pump is very low, and the low temperature is easily conducted to the radiator of the IPM intelligent power module through a copper pipe and the like, so that the condensation phenomenon occurs.

At present, a refrigeration system is generally adopted to cool an IPM intelligent power module by adopting a refrigerant circulation liquid cooling scheme, but in a fluorine pump machine room air conditioning unit, a machine room air conditioner which stops running is placed in an outdoor low-temperature environment, so that the cold energy of outdoor cold air is easily conducted to a radiating plate of the IPM intelligent power module through a copper pipe, condensation phenomenon is possibly formed around the radiating plate, and the existence of condensation water is a very dangerous factor for starting and running of the machine room air conditioner.

In summary, the room air conditioner, especially the fluorine pump room air conditioner, needs to prevent the condensation phenomenon formed on the IPM intelligent power module by low-temperature conduction, so as to avoid the electrical safety problem.

Because the machine room air conditioner, in particular the fluorine pump machine room air conditioner in the prior art has the technical problems of condensation phenomenon formed on the IPM intelligent power module by low-temperature conduction, high energy consumption of the air conditioner and the like, the invention designs a cooling system of the power module and a control method thereof.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that condensation is formed on the IPM intelligent power module by low-temperature conduction of the machine room air conditioner in the prior art, so as to provide a cooling system of the power module and a control method thereof.

In order to solve the above problems, the present invention provides a cooling system of a power module, comprising:

refrigerating system, keep apart heat transfer system and power module, refrigerating system includes evaporimeter and water collector, keep apart heat transfer system for with refrigerating system keeps apart each other's circulation pipeline system, keep apart heat transfer system includes cooling device, power module set up in keep apart heat transfer system, just power module with cooling device passes through the pipeline intercommunication, cooling device set up in the inside comdenstion water of water collector, promptly cooling device can with the comdenstion water carries out heat transfer.

In some embodiments, the isolation heat exchange system comprises a water pump, a first pipeline and a second pipeline, wherein one end of the first pipeline can be communicated with one end of the power module, the other end of the first pipeline can be communicated with one end of the water pump, one end of the second pipeline can be communicated with the other end of the power module, and the other end of the second pipeline can be communicated with one end of the cooling device.

In some embodiments, the isolating and heat exchanging system further comprises a heat dissipating device, the power module can be communicated with the heat dissipating device through a pipeline, and the heat dissipating device is arranged on an air outlet path of the evaporator, namely, the heat dissipating device can exchange heat with air after heat exchange of the evaporator.

In some embodiments, the isolated heat exchange system further comprises a third pipeline and a fourth pipeline, wherein one end of the third pipeline can be communicated with the other end of the water pump, the other end of the third pipeline can be communicated with one end of the heat radiating device, one end of the fourth pipeline can be communicated with the other end of the cooling device, and the other end of the fourth pipeline can be communicated with the other end of the heat radiating device.

In some embodiments, the heat sink includes a cooling tube through which coolant flows and a first fin disposed on the cooling tube.

In some embodiments, the isolated heat exchange system further comprises a bypass line, one end of the bypass line being in communication with the third line, the other end of the bypass line being in communication with the first line, and a one-way valve disposed on the bypass line, the one-way valve only allowing water to flow from the third line to the first line; the heights of the heat dissipation device and the cooling device are higher than the height of the power module.

In some embodiments, the power module includes a heat sink, one end of the first conduit is communicable with one end of the heat sink of the power module, and one end of the second conduit is communicable with the other end of the heat sink of the power module.

In some embodiments, the cooling device includes cooling tubes in which coolant is circulated, the cooling tubes having an interior that is not in communication with condensed water external thereto, and second fins disposed on the cooling tubes.

In some embodiments, the refrigeration system further comprises a compressor, a condenser, and a throttle valve, and the power module is an IPM module.

The invention also provides a control method of the cooling system of the power module, which comprises the following steps:

a detection step of detecting the temperature of the power module;

judging, namely judging the relation between the temperature of the power module and the preset temperature;

a control step of controlling the water pump to be turned on when the temperature of the power module is greater than or equal to the preset temperature; and when the temperature of the power module is smaller than the preset temperature, controlling the water pump to be turned off.

The cooling system of the power module and the control method thereof have the following beneficial effects:

1. the invention sets the isolation heat exchange system isolated from the refrigerating system, the isolation heat exchange system comprises the cooling device which can exchange heat with the condensed water in the water receiving tray of the evaporator in the refrigerating system, so that the secondary refrigerant can heat the external condensed water in the cooling device, the secondary refrigerant in the isolation heat exchange system can be cooled by the condensed water, and then the power module can be cooled, thereby achieving the purpose of cooling the power module. Meanwhile, the cooling capacity of the part of condensed water is utilized to cool the power module, so that the power consumption is saved, the energy utilization rate of the system is improved, and the energy efficiency is improved;

2. the heat exchange system further comprises a heat dissipation device capable of exchanging heat with the air of the evaporator in the refrigerating system, so that the air cooled by the evaporator cools and cools the refrigerating medium in the heat exchange system in the heat dissipation device, and further the power module can be cooled and radiated, thereby further achieving the purpose of cooling the power module, further realizing the effect of physically isolating and exchanging heat between the power module and the refrigerating system, further avoiding and preventing the condition that the power module is exposed due to lower outdoor environment temperature in a refrigerating pipeline, avoiding the cold quantity of outdoor cold air from being conducted to the IPM intelligent power module through the refrigerating system, further avoiding the condensation phenomenon around the IPM intelligent power module, and further solving the problem that the air conditioner of a machine room forms condensation on the IPM intelligent power module due to low-temperature conduction; the heat radiator is suitable for cooling the power module under the condition that the condensed water of the evaporator is insufficient, and further effectively ensures the cooling of the power module.

Drawings

FIG. 1 is a schematic diagram of a cooling system embodiment 1 of a power module of the present invention;

fig. 2 is a schematic structural view of embodiment 2 of the cooling system of the power module of the present invention.

The reference numerals are expressed as:

100. a refrigeration system; 200. isolating the heat exchange system; 1. a power module; 2. an evaporator; 3. a heat sink; 4. a water pump; 5. a water receiving tray; 6. a cooling device; 10. a compressor; 11. a condenser; 12. a throttle valve; 13. a one-way valve; 14. an external fan; 15. an inner fan; 101. a first pipeline; 102. a second pipeline; 103. a third pipeline; 104. a fourth pipeline; 106. and a bypass line.

Detailed Description

As shown in fig. 1-2, the present invention provides a cooling system for a power module, comprising:

the cooling system comprises a refrigerating system 100, an isolated heat exchange system 200 and a power module 1 (preferably an IPM module, namely an intelligent power module), wherein the refrigerating system 100 comprises an evaporator 2 and a water receiving disc 5, the isolated heat exchange system 200 is a circulating pipeline system isolated from the refrigerating system 100 (namely the isolated heat exchange system is not in direct contact with the refrigerating system), the isolated heat exchange system 200 comprises a cooling device 6, the power module 1 is arranged in the isolated heat exchange system 200, the power module 1 is communicated with the heat dissipation device 3 through a pipeline, the power module 1 is communicated with the cooling device 6 through a pipeline, and the cooling device 6 is arranged in condensed water in the water receiving disc 5, namely the cooling device 6 can exchange heat with the condensed water.

The invention sets the isolation heat exchange system isolated from the refrigerating system, the isolation heat exchange system comprises the cooling device which can exchange heat with the condensed water in the water receiving tray of the evaporator in the refrigerating system, so that the secondary refrigerant can heat the external condensed water in the cooling device, the secondary refrigerant in the isolation heat exchange system can be cooled by the condensed water, and then the power module can be cooled, thereby achieving the purpose of cooling the power module. Meanwhile, the cooling capacity of the part of condensed water is utilized to cool the power module, so that the power consumption is saved, the energy utilization rate of the system is improved, and the energy efficiency is improved.

In some embodiments, the isolation heat exchange system 200 includes a water pump 4, a first pipe 101, and a second pipe 102, wherein one end of the first pipe 101 can be in communication with one end of the power module 1, the other end of the first pipe 101 can be in communication with one end of the water pump 4, one end of the second pipe 102 can be in communication with the other end of the power module 1, and the other end of the second pipe 102 can be in communication with one end of the cooling device 6.

The heat exchange system is in a preferable structural form, the power module, the cooling device and the water pump are effectively communicated through the structures of the first pipeline and the second pipeline, heat in the power module is cooled through refrigerating medium in the pipeline to become hot water, the hot water flows into the cooling device to be cooled, the hot water is changed into cold water through heat dissipation, the heat is conducted out, cooled cold water can be circulated into the power module again, heat dissipation and cooling are continuously carried out on the power module, and the water pump is used for providing power for water circulation flow.

In some embodiments, the isolation heat exchange system 200 further includes a heat dissipating device 3, the power module 1 may also be in communication with the heat dissipating device 3 through a pipeline, and the heat dissipating device 3 is disposed on an air outlet path of the evaporator 2, that is, the heat dissipating device 3 may exchange heat with air after passing through the heat exchange of the evaporator 2. The heat dissipating device of the present invention is preferably a heat dissipating tube on which heat dissipating fins are provided.

The heat exchange system further comprises a heat dissipation device capable of exchanging heat with the air of the evaporator in the refrigerating system, so that the air cooled by the evaporator cools and cools the refrigerating medium in the heat exchange system in the heat dissipation device, and further the power module can be cooled and radiated, thereby further achieving the purpose of cooling the power module, further realizing the effect of physically isolating and exchanging heat between the power module and the refrigerating system, further avoiding and preventing the condition that the power module is exposed due to lower outdoor environment temperature in a refrigerating pipeline, avoiding the cold quantity of outdoor cold air from being conducted to the IPM intelligent power module through the refrigerating system, further avoiding the condensation phenomenon around the IPM intelligent power module, and further solving the problem that the air conditioner of a machine room forms condensation on the IPM intelligent power module due to low-temperature conduction; the heat radiator is suitable for cooling the power module under the condition that the condensed water of the evaporator is insufficient, and further effectively ensures the cooling of the power module.

According to the intelligent power module, the water pump is adopted to circularly cool the IPM intelligent power module, the water cooling circulation system adopts the cooling pipes and the radiating pipes which are connected in series to cool hot water respectively, the cold energy of the condensed water generated by the evaporator is fully utilized, the heat emitted by the IPM module is prevented from being discharged to indoor air as much as possible, the energy utilization efficiency of the system is improved, and the operation energy efficiency of the system is improved; because the water cooling circulation system and the refrigerating system are physically isolated, the cold energy of outdoor cold air can be prevented from being conducted to the IPM intelligent power module through the refrigerating system, and the condensation phenomenon around the IPM intelligent power module is avoided.

The invention effectively solves the following technical problems:

the design and control method of the cooling and radiating system of the IPM intelligent power module can effectively solve the problem of dew condensation.

2. The cold quantity of the condensed water and the heat quantity discharged by the IPM intelligent module are matched and optimized, namely, the cold quantity of the condensed water is effectively utilized, the energy efficiency of the system is improved, and the heat quantity can be prevented from being discharged into indoor air as much as possible.

In some embodiments, the isolated heat exchange system 200 further includes a third pipe 103 and a fourth pipe 104, wherein one end of the third pipe 103 can be communicated with the other end of the water pump 4, the other end of the third pipe 103 can be communicated with one end of the heat dissipating device 3, one end of the fourth pipe 104 can be communicated with the other end of the cooling device 6, and the other end of the fourth pipe 104 can be communicated with the other end of the heat dissipating device 3.

The heat exchange system is in a preferable structural form, the power module, the cooling device and the heat dissipation device can be effectively connected into a closed circulation loop through the structures of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline, heat in the power module is cooled through the refrigerating medium in the pipeline to become hot water, the hot water flows into the cooling device and the heat dissipation device again to be dissipated, the hot water is changed into cold water, the heat is conducted out, the cooled cold water can be circulated into the power module again, the heat dissipation and the temperature reduction are continuously carried out on the power module, and the water pump is used for providing power for water circulation flow.

In some embodiments, the heat sink 3 includes a heat pipe through which coolant flows, and a first fin disposed on the heat pipe. The heat dissipation device is in a preferable structural form, the secondary refrigerant can flow through the interior of the heat dissipation tube, and the first fins can enhance the heat dissipation effect of the secondary refrigerant in the heat dissipation tube.

The water cooling circulation of the IPM intelligent power module is driven by the water pump, hot water flowing out of the radiating plate of the IPM intelligent power module is cooled by the cooling pipe and the radiating pipe respectively to release heat to the outside to reduce the temperature, and then the hot water returns to the water pump to form a cooling circulation. The water pump, the radiating plate of the IPM intelligent power module, the cooling pipe and the radiating pipe are sequentially connected to form a water cooling system of the IPM intelligent power module.

The cooling pipes are arranged in the water receiving tray of the evaporator, and preferably, heat dissipation ribs (or other reinforced heat dissipation structures such as fins) are arranged outside the cooling pipes; the radiating pipes are arranged in the air duct of the indoor evaporator (namely, the radiating pipes can be arranged in front of or behind the evaporator), the indoor air driven by the inner fan is used for carrying out heat exchange with the radiating pipes, and radiating fins (or other reinforced radiating structures such as fins) are arranged outside the radiating pipes. The cooling pipes and the radiating pipes are connected in series to ensure that the heat of the hot water can be discharged, because condensation water generated by the evaporator is little or even no condensation water is generated in some cases, the heat of the hot water can be radiated into indoor air basically only by virtue of the rear radiating pipes; the low-temperature condensate water is heated after heat exchange with the cooling pipe, and the carried heat is discharged from the drain pipe, so that the cold energy of the low-temperature condensate water is fully utilized, and meanwhile, the heat emitted by the IPM intelligent power module is transferred and discharged outdoors, and the comprehensive energy efficiency of the system is improved.

In some embodiments, the isolated heat exchange system 200 further comprises a bypass line 106 and a check valve 13, wherein one end of the bypass line 106 is connected to the third line 103, the other end of the bypass line 106 is connected to the first line 101, the check valve 13 is disposed on the bypass line 106, and the check valve 13 only allows water to flow from the third line 103 to the first line 101; the heights of the heat dissipation device 3 and the cooling device 6 are higher than the height of the power module 1.

The invention is a preferable structural form of the embodiment 2, and the arrangement of the bypass pipeline and the one-way valve can be suitable for the condition that the heights of the cooling device and the heat dissipating device are higher than the height of the power module, when the heights of the cooling device and the heat dissipating device are higher than the height of the power module, the secondary refrigerant in the pipeline is heated into hot water or water vapor when passing through the power module, the density of the hot water is reduced, and the hot water can move upwards along gravity, so that the effect of heat dissipation from the hot water to the cooling device and the heat dissipating device can be automatically realized; and cooling becomes cold water after the cooling device and the heat abstractor are in the department completion heat dissipation, then because the density increases, the effect of gravity makes cold water move to power module again downwards and heats to can effectively realize the automatic operation when the water pump is not opened.

As shown in fig. 2, a bypass check valve of the water pump is added on the basis of fig. 1, and the flow direction of the check valve is only allowed to be the same as that of the water pump; the outlet of the one-way valve is connected between the outlet of the water pump and the inlet of the IPM intelligent power module, and the inlet of the one-way valve is arranged between the inlet of the water pump and the outlet of the radiating pipe. When the water pump works, the outlet of the water pump is high-pressure, and the inlet of the water pump is low-pressure, and at the moment, the one-way valve is in a reverse high-pressure cut-off state (the one-way valve does not circulate). The preferred embodiment of FIG. 2 is that the cooling tube and the heat dissipating tube are both positioned higher than the heat dissipating plate of the IPM intelligent power module by a distance of more than 500mm; because the water pan of the evaporator is generally lower, the cooling pipes are generally lower than the cooling pipes, so that the cooling plate of the IPM intelligent power module is ensured to be lower than the cooling pipes by more than 500 mm. When the water pump stops running, the density of hot water flowing out of the heat dissipation plate of the IPM intelligent power module is reduced, the hot water flows upwards to the cooling pipe and the heat dissipation pipe to emit heat, the density is increased after the water temperature is reduced, and cold water flows downwards under the action of gravity and returns to the heat dissipation plate of the IPM intelligent power module through the one-way valve, so that a gravity circulation system is formed, and the electric power of the water pump can be greatly saved, and the electric energy is saved.

When the gravity circulation system detects that the chip temperature of the IPM intelligent power module is too high during operation, the water pump is started to start the mechanical circulating water cooling system, and water flow is increased to cool the IPM intelligent power module.

In some embodiments, the power module 1 includes a heat sink, one end of the first pipe 101 can be in communication with one end of the heat sink of the power module 1, and one end of the second pipe 102 can be in communication with the other end of the heat sink of the power module 1. The power module is in a preferable structural form, namely, the power module is effectively radiated through the radiating part, one end of the radiating part is communicated with the first pipeline, and the other end of the radiating part is communicated with the second pipeline, so that water can be introduced into the radiating part, and further, the heating element on the power module is effectively cooled and radiated.

In some embodiments, the cooling device 6 comprises cooling tubes, inside which the coolant circulates, that are not in communication with condensed water outside thereof, and second fins provided on the cooling tubes. This is a preferred embodiment of the cooling device according to the present invention, and the coolant can flow through the cooling tubes, so that the first fins can enhance the heat dissipation effect of the coolant in the cooling tubes.

In some embodiments, the refrigeration system further comprises a compressor 10, a condenser 11, and a throttle valve 12, and the power module 1 is an IPM module. The refrigeration system preferably comprises a compressor, a condenser and a throttle valve, so that the circulation operation of the refrigerant can be effectively realized, the refrigerant evaporates and absorbs heat at the evaporator to generate cold air and condensed water, the cold air can cool the refrigerating medium in the heat radiating device, and the condensed water of the evaporator can cool the refrigerating medium, so that the power module can be cooled and radiated under the combined action.

As shown in fig. 1, a compressor, a condenser, a throttle valve, and an evaporator are sequentially connected to form a refrigeration cycle; the condenser is provided with an external fan (or other heat dissipation devices such as a cooling water pump, a cooling water tower and the like), and the evaporator is provided with an internal fan for driving indoor air to exchange heat through the evaporator; the bottom of the evaporator is generally provided with a water receiving disc for collecting low-temperature condensation water generated by the evaporator, and the cold energy of the low-temperature condensation water carrying part is discharged from a drain pipe, so that the low-temperature condensation water belongs to the waste of the cold energy and is necessary to be fully recycled.

The invention also provides a control method of the cooling system of the power module, which comprises the following steps:

a detection step of detecting the temperature of the power module;

judging, namely judging the relation between the temperature of the power module and the preset temperature;

a control step of controlling the water pump 4 to be turned on when the temperature of the power module is greater than or equal to the preset temperature; and when the temperature of the power module is smaller than the preset temperature, controlling the water pump 4 to be turned off.

The cooling system of the power module is in a preferable control mode, whether the water pump is opened or not can be controlled according to the temperature of the power module, so that the water pump can be started when the temperature of the power module is higher, the power module is cooled through the cooling device and the heat dissipation device, the cooling efficiency is improved, and the power module is cooled through the isolation heat exchange system without being in direct contact with the refrigerating system, thereby effectively avoiding the condition that the power module is exposed and improving the safety performance of the power module; meanwhile, the power module is cooled by utilizing the cold energy of the condensed water, so that the power consumption is effectively reduced, and the energy efficiency of the system is improved.

The invention has the following points:

the water pump is used for circularly cooling the IPM intelligent power module, the water cooling circulation system is used for respectively cooling hot water by adopting a cooling pipe and a radiating pipe which are connected in series, and a water receiving tray arranged at the bottom of the evaporator of the cooling pipe is used for carrying out heat exchange with low-temperature condensation water, so that the power module can be effectively prevented from being subjected to condensation; and the cold energy of the condensed water generated by the evaporator is fully utilized, the energy efficiency of the system is improved, and the heat emitted by the IPM module is prevented from being discharged to indoor air as much as possible.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (10)

1. A cooling system for a power module, characterized by: comprising the following steps:

refrigerating system (100), keep apart heat transfer system (200) and power module (1), refrigerating system (100) include evaporimeter (2) and water collector (5), keep apart heat transfer system (200) for with refrigerating system (100) keep apart each other circulation pipeline system, keep apart heat transfer system (200) include cooling device (6), power module (1) set up in keep apart in heat transfer system (200), just power module (1) with cooling device (6) pass through the pipeline intercommunication, cooling device (6) set up in the inside comdenstion water of water collector (5), promptly cooling device (6) can with the comdenstion water carries out heat transfer.

2. The cooling system of a power module of claim 1, wherein:

the isolation heat exchange system (200) comprises a water pump (4), a first pipeline (101) and a second pipeline (102), one end of the first pipeline (101) can be communicated with one end of the power module (1), the other end of the first pipeline (101) can be communicated with one end of the water pump (4), one end of the second pipeline (102) can be communicated with the other end of the power module (1), and the other end of the second pipeline (102) can be communicated with one end of the cooling device (6).

3. The cooling system of a power module of claim 2, wherein:

the isolation heat exchange system (200) further comprises a heat dissipation device (3), the power module (1) can be communicated with the heat dissipation device (3) through a pipeline, the heat dissipation device (3) is arranged on an air outlet path of the evaporator (2), namely, the heat dissipation device (3) can exchange heat with air subjected to heat exchange of the evaporator (2).

4. A cooling system for a power module according to claim 3, characterized in that:

the isolation heat exchange system (200) further comprises a third pipeline (103) and a fourth pipeline (104), one end of the third pipeline (103) can be communicated with the other end of the water pump (4), the other end of the third pipeline (103) can be communicated with one end of the heat radiating device (3), one end of the fourth pipeline (104) can be communicated with the other end of the cooling device (6), and the other end of the fourth pipeline (104) can be communicated with the other end of the heat radiating device (3).

5. A cooling system for a power module according to claim 3, characterized in that:

the heat dissipation device (3) comprises a heat dissipation pipe and first fins, wherein the coolant circulates in the heat dissipation pipe, and the first fins are arranged on the heat dissipation pipe.

6. The cooling system of a power module of claim 4, wherein:

the isolation heat exchange system (200) further comprises a bypass pipeline (106) and a one-way valve (13), one end of the bypass pipeline (106) is communicated with the third pipeline (103), the other end of the bypass pipeline (106) is communicated with the first pipeline (101), the one-way valve (13) is arranged on the bypass pipeline (106), and the one-way valve (13) can only allow water to flow from the third pipeline (103) to the first pipeline (101); the heights of the heat dissipation device (3) and the cooling device (6) are higher than the height of the power module (1).

7. The cooling system of a power module of claim 2, wherein:

the power module (1) comprises a heat dissipation part, one end of the first pipeline (101) can be communicated with one end of the heat dissipation part of the power module (1), and one end of the second pipeline (102) can be communicated with the other end of the heat dissipation part of the power module (1).

8. The cooling system of a power module of any of claims 1-7, wherein:

the cooling device (6) comprises cooling pipes and second fins, wherein the coolant circulates in the cooling pipes, the inside of the cooling pipes is not communicated with condensed water outside the cooling pipes, and the second fins are arranged on the cooling pipes.

9. The cooling system of a power module of any one of claims 1-8, wherein:

the refrigeration system further comprises a compressor (10), a condenser (11) and a throttle valve (12), and the power module (1) is an IPM module.

10. A control method of a cooling system of a power module according to any one of claims 1-9, characterized by: comprising the following steps:

a detection step of detecting the temperature of the power module;

judging, namely judging the relation between the temperature of the power module and the preset temperature;

a control step of controlling the water pump (4) to be turned on when the temperature of the power module is greater than or equal to the preset temperature; and when the temperature of the power module is smaller than the preset temperature, controlling the water pump (4) to be turned off.

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