A cooling system for a power module and its control method

Abstract

The present invention provides a cooling system for a power module and a control method thereof. The cooling system for the power module includes: a refrigeration system, an isolation heat exchange system, and a power module. The refrigeration system includes an evaporator and a water receiving tray. The isolation heat exchange system is a circulating pipeline system isolated from the refrigeration system. The isolation heat exchange system includes a cooling device. The power module is arranged in the isolation heat exchange system, and the power module is communicated with the cooling device through a pipeline. The cooling device is arranged in the condensed water inside the water receiving tray, that is, the cooling device can exchange heat with the condensed water. According to the present invention, the physical isolation between the power module and the refrigeration system is effectively realized, and the cold quantity of outdoor cold air is prevented from being conducted to the IPM intelligent power module through the refrigeration system, thereby avoiding the condensation phenomenon around the IPM intelligent power module.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly relates to a cooling system for a power module and a control method thereof. Background Art

[0002] With the large-scale application of 4G and the gradual popularization of 5G, the heat generation of various data processing devices is increasing, and the requirements for the refrigerating capacity and energy saving of air conditioning equipment in data centers are also getting higher and higher.

[0003] Using the outdoor natural cold source in the transitional season and cold winter to cool the data center can greatly reduce the operating cost of air conditioning equipment. Commonly, a fluorine pump air conditioner is used. In winter, the fluorine pump mode is enabled, and the operation of the compressor is stopped. The refrigerant is driven by the fluorine pump to achieve heat pipe refrigeration operation, which greatly reduces the operating cost of the equipment.

[0004] Due to the changes in the heat load of the data center and the outdoor ambient temperature, the refrigerating capacity output of the air conditioner in the data center computer room needs to be intelligently adjusted and controlled accordingly to meet the requirements of the data center for air conditioning with constant temperature and humidity. Most of the current mainstream variable-capacity output refrigeration systems adopt variable frequency control, such as using variable frequency compressors, DC speed control fans, etc.

[0005] A variable frequency compression refrigeration cycle system combined with a fluorine pump cycle usually has an IPM intelligent power module with a relatively large heat generation. As the heat generation of the intelligent power module is increasing, the requirements for its heat dissipation system are also getting higher and higher. The lateral heat diffusion performance of the intelligent power module on the market is poor, and the heat capacity is small. When the power chip (such as IGBT chip, FRD chip or MOS chip, etc.) starts to work instantaneously, it will generate a large amount of heat, which will cause the temperature of the IGBT chip, FRD chip or MOS chip to increase suddenly and damage the power chip. The heat generation of the intelligent power module often changes, but in many cases, the cooling fluid is not accurately controlled during design, resulting in a relatively large fluctuation in the working temperature of the intelligent power module, and it is easy to have over-temperature or the surface temperature is lower than the air dew point temperature. When the surface temperature is lower than the air dew point temperature, it is easy to form condensed water on the surface of the radiator, which poses a serious safety threat to the controller.

[0006] Because the power consumption of the fluorine pump cycle is much smaller than that of the compression refrigeration cycle, the heat generation of the power module is also relatively small. Correspondingly, the flow rate of the cooling fluid of the power module can be much smaller; even when the fluorine pump cycle is running, the power module does not participate in the operation, that is, no cooling is required. However, when the outdoor ambient 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 copper pipes, etc., and then condensation occurs.

[0007] Currently, the refrigerant circulation liquid cooling scheme of the refrigeration system is usually adopted to cool down the IPM intelligent power module. However, in the fluorine pump computer room air conditioner unit, when the computer room air conditioner placed in the outdoor low-temperature environment stops running, it is easy to conduct the cold quantity of the outdoor cold air to the heat dissipation plate of the IPM intelligent power module through the copper pipe, and then condensation may occur around it. The existence of condensed water is a very dangerous factor for the startup and operation of the computer room air conditioner.

[0008] In summary, computer room air conditioners, especially fluorine pump computer room air conditioners, need to prevent condensation from forming on the IPM intelligent power module due to low-temperature conduction and avoid electrical safety problems.

[0009] Due to technical problems such as condensation forming on the IPM intelligent power module due to low-temperature conduction and / or high air conditioner energy consumption in the existing computer room air conditioners, especially fluorine pump computer room air conditioners, the present invention researches and designs a cooling system for a power module and its control method. Summary of the Invention

[0010] Therefore, the technical problem to be solved by the present invention is to overcome the defect that condensation forms on the IPM intelligent power module due to low-temperature conduction in the existing computer room air conditioners, so as to provide a cooling system for a power module and its control method.

[0011] To solve the above problems, the present invention provides a cooling system for a power module, which includes:

[0012] A refrigeration system, an isolation heat exchange system, and a power module. The refrigeration system includes an evaporator and a water receiving tray. The isolation heat exchange system is a circulating pipeline system isolated from the refrigeration system. The isolation heat exchange system includes a cooling device. The power module is arranged in the isolation heat exchange system, and the power module is communicated with the cooling device through a pipeline. The cooling device is arranged in the condensed water inside the water receiving tray, that is, the cooling device can exchange heat with the condensed water.

[0013] In some embodiments, the isolation heat exchange system includes a water pump, a first pipeline, and a second pipeline. 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.

[0014] In some embodiments, the isolation heat exchange system further includes a heat dissipation device. The power module can also be communicated with the heat dissipation device through a pipeline. The heat dissipation device is arranged on the air outlet path of the evaporator, that is, the heat dissipation device can exchange heat with the air after heat exchange by the evaporator.

[0015] In some embodiments, the isolation heat exchange system further includes a third pipeline and a fourth pipeline. 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 dissipation 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 dissipation device.

[0016] In some embodiments, the heat dissipation device includes a heat dissipation pipe and a first fin. A coolant flows inside the heat dissipation pipe, and the first fin is arranged on the heat dissipation pipe.

[0017] In some embodiments, the isolation heat exchange system further includes a bypass pipeline and a check valve. One end of the bypass pipeline is communicated with the third pipeline, the other end of the bypass pipeline is communicated with the first pipeline, the check valve is arranged on the bypass pipeline, and the check valve only allows water to flow from the third pipeline to the first pipeline; the heights of both the heat dissipation device and the cooling device are higher than the height of the power module.

[0018] In some embodiments, the power module includes a heat dissipation part. One end of the first pipeline can be communicated with one end of the heat dissipation part of the power module, and one end of the second pipeline can be communicated with the other end of the heat dissipation part of the power module.

[0019] In some embodiments, the cooling device includes a cooling pipe and a second fin. A coolant flows inside the cooling pipe, the inside of the cooling pipe is not communicated with the condensed water outside it, and the second fin is arranged on the cooling pipe.

[0020] In some embodiments, the refrigeration system further includes a compressor, a condenser and a throttle valve, and the power module is an IPM module.

[0021] The present invention also provides a control method for a cooling system of a power module as described above, which includes:

[0022] A detection step of detecting the temperature of the power module;

[0023] A judgment step of judging the relationship between the temperature of the power module and a preset temperature;

[0024] 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 controlling the water pump to be turned off when the temperature of the power module is less than the preset temperature.

[0025] A power module cooling system and a control method thereof provided by the present invention have the following beneficial effects:

[0026] 1. The present invention provides an isolated heat exchange system isolated from the refrigeration system. The isolated heat exchange system includes a cooling device capable of exchanging heat with the condensed water in the water receiving tray of the evaporator in the refrigeration system, enabling the secondary refrigerant to heat the external condensed water in the cooling device. The condensed water can cool the secondary refrigerant in the isolated heat exchange system, thereby cooling and dissipating heat from the power module, achieving the purpose of cooling the power module. At the same time, due to the adoption of the isolated heat exchange system, the power module is not directly arranged on the refrigeration pipeline for cooling, effectively realizing the physical isolation between the power module and the refrigeration system, thus effectively avoiding and preventing the condensation of the power module caused by the low outdoor ambient temperature in the refrigeration pipeline. It prevents the cold quantity of the outdoor cold air from being conducted to the IPM intelligent power module through the refrigeration system, thereby avoiding the condensation phenomenon around the IPM intelligent power module, and effectively solving the problem of condensation formed on the IPM intelligent power module due to low-temperature conduction in the computer room air conditioner. Meanwhile, the cold quantity of this part of the condensed water is utilized to cool the power module, saving power consumption, improving the energy utilization rate of the system, and enhancing the energy efficiency;

[0027] 2. The present invention also includes a heat dissipation device in the isolated heat exchange system capable of exchanging heat with the air of the evaporator in the refrigeration system, enabling the air cooled by the evaporator to cool the secondary refrigerant in the isolated heat exchange system in the heat dissipation device, thereby further cooling and dissipating heat from the power module, further achieving the purpose of cooling the power module, further realizing the physical isolation and heat exchange effect between the power module and the refrigeration system, further avoiding and preventing the condensation of the power module caused by the low outdoor ambient temperature in the refrigeration pipeline, preventing the cold quantity of the outdoor cold air from being conducted to the IPM intelligent power module through the refrigeration system, further avoiding the condensation phenomenon around the IPM intelligent power module, and further solving the problem of condensation formed on the IPM intelligent power module due to low-temperature conduction in the computer room air conditioner. The heat dissipation device of the present invention is suitable for cooling the power module when the condensed water of the evaporator is insufficient, further effectively ensuring the cooling of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of Embodiment 1 of the cooling system of the power module of the present invention;

[0029] Figure 2 is a schematic structural diagram of Embodiment 2 of the cooling system of the power module of the present invention.

[0030] The reference numerals are shown as:

[0031] 100, Refrigeration system; 200, Isolated heat exchange system; 1, Power module; 2, Evaporator; 3, Heat dissipation device; 4, Water pump; 5, Water receiving tray; 6, Cooling device; 10, Compressor; 11, Condenser; 12, Throttle valve; 13, Check valve; 14, External fan; 15, Internal fan; 101, First pipeline; 102, Second pipeline; 103, Third pipeline; 104, Fourth pipeline; 106, Bypass pipeline. Detailed implementation mode

[0032] As Figure 1-2 shown, the present invention provides a cooling system for a power module, which includes:

[0033] A refrigeration system 100, an isolated heat exchange system 200, and a power module 1 (preferably an IPM module, i.e., an intelligent power module). The refrigeration system 100 includes an evaporator 2 and a water receiving tray 5. The isolated heat exchange system 200 is a circulating pipeline system isolated from the refrigeration system 100 (i.e., the isolated heat exchange system and the refrigeration system do not directly contact). The isolated heat exchange system 200 includes a cooling device 6. The power module 1 is disposed in the isolated heat exchange system 200, and the power module 1 is communicated with the heat dissipation device 3 through a pipeline, and the power module 1 is communicated with the cooling device 6 through a pipeline. The cooling device 6 is disposed in the condensed water inside the water receiving tray 5, that is, the cooling device 6 can exchange heat with the condensed water.

[0034] The present invention provides an isolated heat exchange system isolated from the refrigeration system. The isolated heat exchange system includes a cooling device that can exchange heat with the condensed water in the water receiving tray of the evaporator in the refrigeration system, so that the coolant can heat the external condensed water in the cooling device. The condensed water can cool down the coolant in the isolated heat exchange system, and then can dissipate heat from the power module, so as to achieve the purpose of cooling the power module. At the same time, due to the adoption of the isolated heat exchange system, the power module is not directly arranged on the refrigeration pipeline for cooling, effectively realizing the physical isolation between the power module and the refrigeration system, thus effectively avoiding and preventing the condensation of the power module due to the low outdoor ambient temperature in the refrigeration pipeline, avoiding the cold quantity of the outdoor cold air from being conducted to the IPM intelligent power module through the refrigeration system, and thus avoiding the condensation phenomenon around the IPM intelligent power module, effectively solving the problem of condensation formed on the IPM intelligent power module due to low-temperature conduction of the computer room air conditioner. At the same time, the cold quantity of this part of the condensed water is utilized to cool the power module, saving power consumption, improving the energy utilization rate of the system, and improving the energy efficiency.

[0035] In some embodiments, the isolated heat exchange system 200 includes a water pump 4, a first pipeline 101, and a second pipeline 102. One end of the first pipeline 101 can communicate with one end of the power module 1, the other end of the first pipeline 101 can communicate with one end of the water pump 4, one end of the second pipeline 102 can communicate with the other end of the power module 1, and the other end of the second pipeline 102 can communicate with one end of the cooling device 6.

[0036] This is a preferred structural form of the isolated heat exchange system of the present invention. Through the structures of the first pipeline and the second pipeline, the power module, the cooling device, and the water pump can be effectively connected. The heat in the power module is cooled by the coolant in the pipeline to become hot water, and the hot water then flows to the cooling device for heat dissipation, turning the hot water into cold water to complete the heat export. The cooled cold water can circulate back to the power module again to continue cooling the power module. The water pump is used to provide the power for the water cycle.

[0037] In some embodiments, the isolated heat exchange system 200 further includes a heat dissipation device 3. The power module 1 can also be connected to the heat dissipation device 3 through a pipeline. The heat dissipation device 3 is arranged on the air outlet path of the evaporator 2, that is, the heat dissipation device 3 can exchange heat with the air after heat exchange through the evaporator 2. The heat dissipation device of the present invention is preferably a heat dissipation pipe, on which heat dissipation fins are provided.

[0038] The present invention also includes a heat dissipation device in the isolated heat exchange system that can exchange heat with the air of the evaporator in the refrigeration system, so that the air cooled by the evaporator cools the coolant in the isolated heat exchange system in the heat dissipation device, thereby further cooling the power module, further achieving the purpose of cooling the power module, further realizing the physical isolation and heat exchange effect between the power module and the refrigeration system, further avoiding and preventing the condensation of the power module due to the low outdoor ambient temperature in the refrigeration pipeline, avoiding the cold quantity of the outdoor cold air being conducted to the IPM intelligent power module through the refrigeration system, further avoiding the condensation phenomenon around the IPM intelligent power module, and further solving the problem of condensation formed on the IPM intelligent power module due to low-temperature conduction of the computer room air conditioner; the heat dissipation device of the present invention is suitable for cooling the power module when the condensate water of the evaporator is insufficient, further effectively ensuring the cooling of the power module.

[0039] The present invention uses a water pump to circulate and cool the IPM intelligent power module. The water-cooling circulation system uses series-connected cooling pipes and heat-dissipating pipes to cool hot water respectively, fully utilizing the cooling capacity of the condensed water generated by the evaporator, and minimizing the heat emitted by the IPM module from being discharged into the indoor air, thereby improving the energy utilization efficiency of the system and enhancing the operating energy efficiency of the system. Since the water-cooling circulation system and the refrigeration system are physically isolated, it is possible to prevent the cooling capacity of the outdoor cold air from being conducted to the IPM intelligent power module through the refrigeration system, thus avoiding the occurrence of condensation around the IPM intelligent power module.

[0040] The present invention effectively solves the following technical problems:

[0041] 1. The design of the cooling and heat-dissipating system for the IPM intelligent power module and its control method, that is, effectively solving the problem of condensed water.

[0042] 2. The coordination and optimization between the cooling capacity of the condensed water and the heat emitted by the IPM intelligent module, that is, effectively utilizing the cooling capacity of the condensed water, improving the system energy efficiency, and minimizing the heat from being discharged into the indoor air.

[0043] In some embodiments, the isolation heat exchange system 200 further includes a third pipeline 103 and a fourth pipeline 104. One end of the third pipeline 103 can be connected to the other end of the water pump 4, the other end of the third pipeline 103 can be connected to one end of the heat dissipation device 3, one end of the fourth pipeline 104 can be connected to the other end of the cooling device 6, and the other end of the fourth pipeline 104 can be connected to the other end of the heat dissipation device 3.

[0044] This is the preferred structural form of the isolation heat exchange system of the present invention. Through the structures of the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline, the power module, the cooling device, and the heat dissipation device can be effectively connected to a closed-loop circulation circuit. The heat in the power module is cooled by the coolant in the pipeline and becomes hot water. The hot water then flows to the cooling device and the heat dissipation device for heat dissipation, and the hot water is turned into cold water, completing the derivation of heat. The cooled cold water can circulate back to the power module again to continue cooling and dissipating heat from the power module. The water pump is used to provide the power for the water to circulate.

[0045] In some embodiments, the heat dissipation device 3 includes a heat dissipation pipe and a first fin. The heat dissipation pipe allows the coolant to flow through it, and the first fin is arranged on the heat dissipation pipe. This is the preferred structural form of the heat dissipation device of the present invention. By allowing the coolant to flow through the heat dissipation pipe internally, the first fin can enhance the heat dissipation effect of the coolant inside the heat dissipation pipe.

[0046] The water-cooling cycle of the IPM intelligent power module of the present invention is driven by a water pump. The hot water flowing out of the heat dissipation plate of the IPM intelligent power module is cooled through a cooling pipe and a heat dissipation pipe respectively, releases heat to the outside to reduce the temperature, and then returns to the water pump to form a cooling cycle. The water pump, the heat dissipation plate of the IPM intelligent power module, the cooling pipe and the heat dissipation pipe are sequentially connected to form the water-cooling system of the IPM intelligent power module.

[0047] In the present invention, the cooling pipe is arranged in the water receiving tray of the evaporator. Preferably, heat dissipation fins (or other heat dissipation strengthening structures such as fins) are arranged outside the cooling pipe; the heat dissipation pipe is arranged in the air duct of the indoor evaporator (that is, the heat dissipation pipe can be arranged in front of or behind the evaporator), and the indoor air driven by the internal fan exchanges heat with the heat dissipation pipe. Heat dissipation fins (or other heat dissipation strengthening structures such as fins) are arranged outside the heat dissipation pipe. The series connection of the cooling pipe and the heat dissipation pipe is to ensure that the heat of the hot water can be discharged. Because sometimes the condensed water generated by the evaporator is very little or even no condensed water is generated. At this time, the heat dissipation of the hot water basically depends on the subsequent heat dissipation pipe to dissipate the heat into the indoor air; the low-temperature condensed water exchanges heat with the cooling pipe and then warms up, and discharges the heat from the drain pipe, so as to make full use of the cold quantity of the low-temperature condensed water and transfer the heat dissipated by the IPM intelligent power module to the outside of the room at the same time, and the comprehensive energy efficiency of the system is improved.

[0048] In some embodiments, the isolation heat exchange system 200 further includes a bypass pipeline 106 and a one-way valve 13. One end of the bypass pipeline 106 communicates with the third pipeline 103, and the other end of the bypass pipeline 106 communicates with the first pipeline 101. The one-way valve 13 is arranged on the bypass pipeline 106, and the one-way valve 13 only allows 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 both higher than the height of the power module 1.

[0049] This is the preferred structural form of Embodiment 2 of the present invention. Through the setting of the bypass pipeline and the one-way valve, it can be applicable to the situation where the heights of the cooling device and the heat dissipation device are both higher than the height of the power module. When the heights of the cooling device and the heat dissipation device are both higher than the height of the power module, the coolant in the pipeline is heated into hot water or water vapor when passing through the power module, and the density of the hot water becomes smaller, so that it can move upward along the gravity. Therefore, the effect that the hot water can automatically move to the cooling device and the heat dissipation device for heat dissipation can be realized; and after the heat dissipation is completed at the cooling device and the heat dissipation device and the temperature drops to become cold water, due to the increase in density, the action of gravity makes the cold water move downward and then to the power module for heating, so that the automatic operation when the water pump is not started can be effectively realized.

[0050] As Figure 2 shown, in Figure 1On the basis of this, a bypass check valve for the water pump is added. The flow direction of the check valve only allows the same direction as that of the water pump. The outlet of the check valve is connected between the outlet of the water pump and the inlet of the IPM intelligent power module, and the inlet of the check valve is arranged between the inlet of the water pump and the outlet of the heat dissipation pipe. When the water pump is working, the outlet of the water pump is at high pressure and the inlet of the water pump is at low pressure. At this time, the check valve is in the reverse high-pressure cut-off state (the check valve is not in circulation). Figure 2 A preferred implementation is that the positions of the cooling pipe and the heat dissipation pipe are both higher than the position of the heat dissipation plate of the IPM intelligent power module, and the distance is greater than 500 mm. Since the water receiving tray of the evaporator is generally relatively low, the cooling pipe is usually lower than the heat dissipation pipe. Therefore, it is only necessary to ensure that the heat dissipation plate of the IPM intelligent power module is more than 500 mm lower than the cooling pipe. When the water pump stops running, the density of the hot water flowing out of the heat dissipation plate of the IPM intelligent power module becomes smaller, and the hot water flows upward to the cooling pipe and the heat dissipation pipe to dissipate heat. After the water temperature drops, the density increases, and under the action of gravity, the cold water flows downward and returns to the heat dissipation plate of the IPM intelligent power module through the check valve, thus forming a gravity circulation system, which can greatly save the electric power of the water pump and thus save electric energy.

[0051] When it is detected that the chip temperature of the IPM intelligent power module is too high during the operation of the gravity circulation system, start the water pump to turn on the mechanical circulation water cooling system to increase the water flow rate to cool down the IPM intelligent power module.

[0052] In some embodiments, the power module 1 includes a heat dissipation part. One end of the first pipeline 101 can communicate with one end of the heat dissipation part of the power module 1, and one end of the second pipeline 102 can communicate with the other end of the heat dissipation part of the power module 1. This is the preferred structural form of the power module of the present invention, that is, the power module is effectively cooled through the heat dissipation part. One end of the heat dissipation part communicates with the first pipeline and the other end communicates with the second pipeline to be able to introduce water into the heat dissipation part, and then effectively cool and dissipate heat from the heating elements on the power module.

[0053] In some embodiments, the cooling device 6 includes a cooling pipe and a second fin. The cooling pipe circulates a coolant inside, and the inside of the cooling pipe is not connected to the condensed water outside it. The second fin is arranged on the cooling pipe. This is the preferred structural form of the cooling device of the present invention. By allowing a coolant to circulate inside the cooling pipe, the first fin can enhance the heat dissipation effect of the coolant inside the cooling pipe.

[0054] In some embodiments, the refrigeration system further includes a compressor 10, a condenser 11, and a throttle valve 12, and the power module 1 is an IPM module. The refrigeration system of the present invention preferably includes 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, generating cold air and condensed water. The cold air can cool the coolant in the heat dissipation device, and the condensed water of the evaporator can cool the coolant, so that the combined action can cool and dissipate heat from the power module. Since an isolation heat exchange system isolated from the refrigeration system is adopted, the condensation of the power module is effectively prevented, and the heat of the power module is used to provide heat to the cooling device and the heat dissipation device respectively, effectively utilizing the cold quantity of the condensed water and improving the energy efficiency of the system.

[0055] As Figure 1 shown, the compressor, the condenser, the throttle valve, and the evaporator are connected in sequence to form a refrigeration cycle; the condenser is provided with an external fan (or other heat dissipation devices such as a cooling water pump and a cooling water tower), and the evaporator is provided with an internal fan for driving indoor air to exchange heat through the evaporator; a water receiving tray is usually arranged at the bottom of the evaporator for collecting the low-temperature condensed water generated by the evaporator. The low-temperature condensed water carries part of the cold quantity and is discharged from the drain pipe, which is a waste of refrigeration capacity, and it is necessary to fully recover and utilize it.

[0056] The present invention also provides a control method for the cooling system of the power module as described above, which includes:

[0057] A detection step of detecting the temperature of the power module;

[0058] A judgment step of judging the relationship between the temperature of the power module and a preset temperature;

[0059] A control step of controlling the water pump 4 to open when the temperature of the power module is greater than or equal to the preset temperature; and controlling the water pump 4 to close when the temperature of the power module is less than the preset temperature.

[0060] This is the preferred control form of the cooling system of the power module of the present invention, which can control the opening or closing of the water pump according to the temperature of the power module. Thus, the water pump can be started when the temperature of the power module is relatively high, and the power module is cooled jointly by the cooling device and the heat dissipation device, improving the cooling efficiency. And since the isolation heat exchange system is adopted to cool the power module, it does not directly contact the refrigeration system, effectively avoiding the condensation of the power module and improving its safety performance; at the same time, the cold quantity of the condensed water is used to cool the power module, effectively reducing the power consumption and improving the energy efficiency of the system.

[0061] The inventive point of the present invention lies in:

[0062] The water pump circulating cooling IPM intelligent power module. In the water cooling circulating system, the cooling pipes and the heat dissipation pipes in series are used to cool the hot water respectively. The cooling pipes are arranged at the water receiving tray at the bottom of the evaporator to exchange heat with the low-temperature condensed water, which can effectively prevent condensation on the power module; and make full use of the cold energy of the condensed water generated by the evaporator, improve the energy efficiency of the system, and avoid the heat emitted by the IPM module from being discharged into the indoor air as much as possible.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A cooling system for a power module, characterized in that: Comprising: A refrigeration system (100), an isolation heat exchange system (200) and a power module (1), wherein the refrigeration system (100) includes an evaporator (2) and a water receiving tray (5), the isolation heat exchange system (200) is a circulating pipeline system isolated from the refrigeration system (100), the isolation heat exchange system (200) includes a cooling device (6), the power module (1) is arranged in the isolation heat exchange system (200), and the power module (1) is communicated with the cooling device (6) through a pipeline, and the cooling device (6) is arranged in the condensed water inside the water receiving tray (5), that is, the cooling device (6) can exchange heat with the condensed water.

2. The cooling system of the power module according to claim 1, characterized in that: The isolation heat exchange system (200) includes 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 the power module according to claim 2, characterized in that: The isolation heat exchange system (200) further includes a heat dissipation device (3), the power module (1) can also be communicated with the heat dissipation device (3) through a pipeline, and the heat dissipation device (3) is arranged on the air outlet path of the evaporator (2), that is, the heat dissipation device (3) can exchange heat with the air after heat exchange through the evaporator (2).

4. The cooling system of the power module according to claim 3, characterized in that: The isolation heat exchange system (200) further includes 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 dissipation 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 dissipation device (3).

5. The cooling system of the power module according to claim 3, characterized in that: The heat dissipation device (3) includes a heat dissipation pipe and a first fin, a coolant flows inside the heat dissipation pipe, and the first fin is arranged on the heat dissipation pipe.

6. The cooling system of the power module according to claim 4, characterized in that: The isolation heat exchange system (200) further includes a bypass pipeline (106) and a check valve (13). One end of the bypass pipeline (106) communicates with the third pipeline (103), and the other end of the bypass pipeline (106) communicates with the first pipeline (101). The check valve (13) is arranged on the bypass pipeline (106), and the check valve (13) only allows 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 both higher than the height of the power module (1).

7. The cooling system for a power module according to claim 2, wherein: The power module (1) includes a heat dissipation part. One end of the first pipeline (101) can communicate with one end of the heat dissipation part of the power module (1), and one end of the second pipeline (102) can communicate with the other end of the heat dissipation part of the power module (1).

8. The cooling system for a power module according to any one of claims 1-7, wherein: The cooling device (6) includes a cooling pipe and a second fin. A coolant flows inside the cooling pipe, and the inside of the cooling pipe is not communicated with the condensed water outside it. The second fin is arranged on the cooling pipe.

9. The cooling system for a power module according to any one of claims 1-7, wherein: The refrigeration system further includes a compressor (10), a condenser (11) and a throttle valve (12), and the power module (1) is an IPM module.

10. A control method for a cooling system of a power module according to any one of claims 2-7, characterized in that: Comprising: A detection step of detecting the temperature of the power module; A judgment step of judging the relationship between the temperature of the power module and a preset temperature; A control step of controlling the water pump (4) to open when the temperature of the power module is greater than or equal to the preset temperature; and controlling the water pump (4) to close when the temperature of the power module is less than the preset temperature.

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