Converter liquid cooling device

Abstract

A liquid cooling device for a converter comprises a liquid cooling plate and a liquid cooling pipeline, a plurality of power module areas are sequentially arranged on the upper surface of the liquid cooling plate at intervals, the liquid cooling pipeline is a serial pipeline and can achieve absolutely balanced flow of the whole pipeline, and effective cleaning of the pipeline can be achieved through high-pressure water injection; the liquid cooling pipeline passes through the projection areas of the power module areas one by one according to a positive sequence in the flowing direction of a liquid cooling medium, then enters the liquid cooling row, turns round after being discharged from the liquid cooling row, and passes through the projection areas of the power module areas one by one according to a reverse sequence, and the liquid cooling pipeline is of a multi-section curve structure in the projection areas of the power module areas; and the passing according to the positive sequence and the passing according to the negative sequence are staggered, so that reliable temperature equalization of the power module can be realized; furthermore, a two-layer small air conditioner is configured to increase the refrigerating capacity and is ingeniously coupled with the one-layer main liquid cooling system, and the low-temperature efficient heat dissipation function of the heating power module and the function of efficient heat dissipation from the outside of the one-layer main liquid cooling system to the space are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of energy storage, and in particular to a converter liquid cooling device. Background Art

[0002] PCS (Power Conversion System, energy storage converter) can control the charging and discharging process of the battery, perform AC / DC conversion, and directly supply power to AC loads without a power grid. PCS is composed of a DC / AC bidirectional converter, a control unit, etc. The converter includes multiple IGBT modules. As the heat flux density of each electronic device in the IGBT module is also increasing rapidly, the amount of heat generated is also increasing sharply. At the same time, the increase in the power level of the IGBT module and the demand for miniaturization have led to an increase in the power density of the PCS, and the resulting heat dissipation problem has become increasingly prominent. In order to solve the heat dissipation problem of the converter, improve the cooling efficiency of the converter, ensure the stable and reliable operation of high-power converters, and provide technical support for the further development of converter cooling technology, it is necessary to strengthen the heat dissipation of the IGBT module. Existing IGBT module heat dissipation methods include natural cooling, forced air cooling, and liquid cooling technology.

[0003] 1) Natural air cooling uses air as the heat exchange medium and cools through air convection and radiation. Due to the low physical properties of air such as specific heat capacity and density, its heat dissipation capacity is not high and cannot meet the heat dissipation requirements of the power module;

[0004] 2) Forced air cooling is a method of using a fan device to increase the air flow rate through the heat sink to achieve efficient cooling. Compared with natural cooling, which greatly improves the heat dissipation efficiency, the advantages of forced air cooling are simple structure, low cost, and application to devices with relatively high temperatures. However, when the heat dissipation capacity of forced air cooling reaches a certain limit, it cannot further improve the performance of thermal systems such as converters, and it is noisy.

[0005] 3) Liquid cooling technology requires the production of a heat dissipation substrate. Liquid media is passed through aluminum, copper and other heat dissipation plates to concentrate the heat dissipation of power devices, thereby improving the heat dissipation performance. Liquid cooling of converters is an effective method for improving the power density of power modules. The conventional design scheme is a parallel flow channel design, which can dissipate heat for the entire liquid cooling plate, or for the power heating points on the surface of the liquid cooling plate. However, due to problems with the length of the pipeline, the design of the power heat dissipation point, and the blockage of the pipeline due to dirt deposition after long-term use, the parallel flow channel will have flow deviations, and the design is prone to flow resistance deviations, which will lead to uneven heat dissipation problems in the power module. The power point module with poor heat dissipation will become the short board point of the long-term reliability of the converter, and the parallel flow channel will be partially blocked. The liquid cooling medium will circulate through the area with lower flow resistance, and the original blocked area cannot be flushed. In contrast, the serial flow channel can achieve an absolutely balanced flow rate in the entire pipeline, and cooperate with the use of high-pressure water injection to achieve effective cleaning of the liquid cooling pipeline. Therefore, the liquid cooling heat dissipation system of this converter adopts a liquid cooling pipeline serial method, but the initial temperature of the water inlet passes through the power module and other hot spots, and the water temperature gradually increases. It passes through each power module and other hot spots in turn, and still cannot achieve reliable uniform temperature.

[0006] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a converter liquid cooling device in view of the above-mentioned defect of the prior art that reliable temperature uniformity cannot be achieved.

[0008] The technical solution adopted by the present invention to solve the technical problem is: construct a converter liquid cooling device, including at least one heat dissipation system, the heat dissipation system includes a liquid cooling plate and a liquid cooling pipeline arranged inside the liquid cooling plate for circulating a liquid cooling medium, the upper surface of the liquid cooling plate is configured with a plurality of power module areas for installing power modules and a cooling row area for installing a liquid cooling row for dissipating heat to the internal environment of the device, and the plurality of power module areas are arranged in sequence and spaced apart;

[0009] The liquid cooling pipeline is a serial pipeline; the liquid cooling pipeline passes through the projection areas of the multiple power module areas one by one in a positive order along the flow direction of the liquid cooling medium and then enters the liquid cooling row, and after coming out of the liquid cooling row, turns around and passes through the projection areas of the multiple power module areas one by one again in a reverse order;

[0010] The liquid cooling pipeline presents a multi-segment curve structure in the projection area of ​​the power module area, and is staggered when passing in a forward sequence and when passing in a reverse sequence.

[0011] Furthermore, in the converter liquid cooling device described in the present invention, the upper surface of the liquid cooling plate is also configured with an inductor area for installing an inductor unit, and the liquid cooling pipeline passes through the projection areas of multiple power module areas in reverse order and then enters and passes through the projection area of ​​the inductor area.

[0012] Furthermore, in the converter liquid cooling device of the present invention, the liquid cooling plate is divided into two layers, the upper layer is configured with a liquid cooling system including the liquid cooling pipeline, and the lower layer is configured with a small air conditioning system, and the small air conditioning system is coupled with the liquid cooling system of the upper layer through the liquid cooling plate;

[0013] The small air conditioning system is used to achieve low-temperature cooling of the power module area, the cold row area, and the inductor area when abnormal temperature occurs in the power module area, the cold row area, or the inductor area.

[0014] Furthermore, in the converter liquid cooling device of the present invention, a temperature rise area is allocated to the upper surface of the liquid cooling plate, and the liquid cooling pipeline is connected to the liquid cooling medium inlet terminal before passing through the projection area of ​​the plurality of power module areas in positive sequence; the liquid cooling pipeline enters the projection area of ​​the temperature rise area nearby after coming out of the inductor area, and is connected to the liquid cooling medium outlet terminal after coming out of the projection area of ​​the temperature rise area;

[0015] The small air-conditioning system comprises a first air-conditioning pipeline, a compressor, a second air-conditioning pipeline, and a throttling expansion valve, wherein the compressor and the throttling expansion valve are mounted on the upper surface of the liquid cooling plate, the outlet and the inlet of the first air-conditioning pipeline are respectively connected to the compressor and the throttling expansion valve after passing through the liquid cooling plate from bottom to top, and the outlet and the inlet of the second air-conditioning pipeline are respectively connected to the throttling expansion valve and the compressor after passing through the liquid cooling plate from bottom to top;

[0016] The first air-conditioning pipeline passes through the projection area of ​​the multiple power module areas to act as a simulated evaporator to cool the power modules directly above it; the second air-conditioning pipeline passes through the projection area of ​​the heating area to act as a simulated condenser to heat the liquid cooling pipeline directly above it.

[0017] Further, in the converter liquid cooling device of the present invention, the liquid cooling pipeline in the projection area of ​​the power module area is two serpentine staggered pipelines, the liquid cooling pipeline forms a serpentine pipeline in the liquid cooling row, the liquid cooling pipeline forms a serpentine pipeline in the projection area of ​​the inductor area, and the liquid cooling pipeline forms a serpentine pipeline in the projection area of ​​the temperature rise area;

[0018] The first air conditioning pipeline forms a serpentine pipeline in the projection area of ​​the plurality of power module areas, and the second air conditioning pipeline forms a serpentine pipeline in the projection area of ​​the temperature rising area.

[0019] Furthermore, in the converter liquid cooling device described in the present invention, the multiple power module areas are evenly spaced apart along the first horizontal direction, the inductor area and the multiple power module areas are located on the same side of the cold row area, and the multiple power module areas are arranged as a whole with the inductor area and the temperature rise area along the second horizontal direction.

[0020] Furthermore, in the converter liquid cooling device of the present invention, power module temperature detection points are respectively configured on both sides of the power module area to monitor the temperature difference on both sides of the power module, and all the power module temperature detection points are arranged at intervals parallel to the first horizontal direction, and the first horizontal direction refers to the arrangement direction of the multiple power module areas;

[0021] Inductor unit temperature detection points are respectively configured on both sides of the inductor area to monitor the temperature difference on both sides of the inductor unit, and the inductor unit temperature detection points on both sides are arranged at intervals parallel to the first horizontal direction; the inductor unit includes multiple inductors, and multiple inductor temperature detection points are configured around the inductor under each inductor to monitor the temperature difference on both sides of the inductor.

[0022] Furthermore, in the converter liquid cooling device of the present invention, the controller of the converter is used to analyze according to the detection results of the temperature detection points of the power module and the temperature detection points of the inductor unit:

[0023] If it is detected that the temperature difference between the two sides of the power module is greater than the first high temperature threshold, it is considered that the heat generation is too large, and the internal abnormality of the power module is further determined in combination with the internal temperature monitoring condition of the power module;

[0024] If it is detected that the temperature difference on both sides of the power module is less than the first low temperature threshold, the internal temperature monitoring condition of the power module continues to be judged. If the internal temperature monitoring of the power module shows that the temperature does not meet the normal working conditions, it is judged that the power module is not started; if the internal temperature monitoring of the power module shows that the temperature meets the normal working conditions, it is judged that the power module is abnormally fitted to the liquid cooling plate or the heat dissipation silicone grease is abnormally applied.

[0025] If it is detected that the temperature difference between the two sides of the inductor unit is greater than the second high temperature threshold, it is considered that the inductor is heating abnormally, and combined with the body temperature detection result of the inductor unit, it is determined whether a false alarm occurs. If there is no false alarm, then: continue to combine the current detection of the inductor unit to determine whether it is caused by overcurrent, and combine the flow detection to determine whether it is caused by leakage due to reduced flow;

[0026] If it is detected that the temperature difference between the two sides of the inductor unit is less than the second low temperature threshold, it is determined whether it is a problem of inductor assembly or silicone grease application in combination with the temperature detection result of the inductor unit body.

[0027] Furthermore, in the converter liquid cooling device of the present invention, the liquid cooling row is vertically set on the liquid cooling plate and perpendicular to the arrangement direction of the plurality of power module areas, and a plurality of heat dissipation fins perpendicular to the heat dissipation surfaces are protrudingly provided on the heat dissipation surfaces on both sides of the liquid cooling row;

[0028] The liquid cooling pipeline passes through the projection areas of the multiple power module areas in a positive sequence and enters the position of the liquid cooling row near the first vertical edge, goes vertically upward in the liquid cooling row to reach the top position of the liquid cooling row, then moves in a serpentine manner to reach the bottom position in the liquid cooling row, and passes through the position of the liquid cooling row near the second vertical edge to the outside of the liquid cooling row.

[0029] Furthermore, in the converter liquid cooling device of the present invention, columnar temperature sensors are embedded in the liquid cooling plate in an array to form a two-dimensional temperature gradient cloud map, and the depth of the columnar temperature sensors from the upper surface of the liquid cooling plate does not exceed 1 mm.

[0030] The converter liquid cooling device of the present invention has the following beneficial effects: on the one hand, the liquid cooling pipeline is a serial pipeline, which can achieve an absolutely balanced flow rate of the entire pipeline, and the liquid cooling pipeline can be effectively cleaned by high-pressure water injection; on the other hand, the liquid cooling pipeline passes through the projection areas of multiple power module areas one by one in a positive sequence along the flow direction of the liquid cooling medium and then enters the liquid cooling row. After coming out of the liquid cooling row, it turns around and passes through the projection areas of multiple power module areas one by one again in a reverse sequence. Moreover, the liquid cooling pipeline presents a multi-segment curve structure in the projection area of ​​the power module area, and the liquid cooling pipeline is staggered when passing in a positive sequence and when passing in a reverse sequence, so that reliable temperature uniformity of the power module can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work:

[0032] Figure 1 This is a top view of the liquid cooling system of the heat dissipation system;

[0033] Figure 2 It is a top view of the small air conditioning system on the second floor of the cooling system;

[0034] Figure 3 This is a front view of the double-layer structure inside the cooling system;

[0035] Figure 4 This is the left view of the double-layer structure inside the cooling system;

[0036] Figure 5 It is a top view of the double-layer structure inside the cooling system;

[0037] Figure 6 It is a schematic diagram of the expansion of the heat dissipation system in the converter;

[0038] Figure 7 This is the schematic diagram of the heat dissipation cycle of the small air conditioning system on the second floor;

[0039] Among them, the reference numerals in the figure are:

[0040] 1. Liquid cooling medium inlet terminal;

[0041] 2. Liquid cooling pipeline;

[0042] 3. Liquid cooling pipe inlet temperature sensor placement hole;

[0043] 4. Liquid cooling plate;

[0044] 5. Power module;

[0045] 6. Power module;

[0046] 7. Power module;

[0047] 8. Heat dissipation fins;

[0048] 9. Liquid cooling radiator;

[0049] 10. Metal tube inside the liquid cooling row;

[0050] 11. Temperature sensor on the right side of power module 5;

[0051] 12. Temperature sensor on the left side of power module 5;

[0052] 13. Temperature sensor on the right side of power module 6;

[0053] 14. Temperature sensor on the left side of power module 6;

[0054] 15. Temperature sensor on the right side of power module 7;

[0055] 16. Temperature sensor on the left side of power module 7;

[0056] 17. Inductor unit;

[0057] 18. Temperature sensor on the right side of the inductor unit;

[0058] 19. Temperature sensor on the left side of the inductor unit;

[0059] 20. Liquid cooling medium outlet terminal;

[0060] 21. The first air conditioning pipeline forms an area simulating an evaporator;

[0061] 22. The first air conditioning pipeline;

[0062] 23. Temperature sensor between throttling expansion valve and simulated evaporator;

[0063] 24. Simulate the temperature sensor between the evaporator and the compressor;

[0064] 25. The second air conditioning pipeline forms an area simulating a condenser;

[0065] 26. Second air conditioning pipeline;

[0066] 27. Throttling expansion valve;

[0067] 28. Micro compressor;

[0068] 29. One layer of liquid cooling plate;

[0069] 30. Metal casing of inductor unit;

[0070] 31. The connecting pipeline of the throttling expansion valve on the second floor;

[0071] 32. The connecting pipeline of the throttling expansion valve on the second floor;

[0072] 33. The connecting pipeline leading out of the micro compressor on the second floor;

[0073] 34. The connecting pipeline leading out of the micro compressor on the second floor;

[0074] 35. Liquid cooling pipe outlet temperature sensor placement hole;

[0075] 36. Second layer of liquid cooling plate;

[0076] 37. The pipes of the small air-conditioning system on the second floor. DETAILED DESCRIPTION

[0077] In view of the defect of the liquid cooling heat dissipation in the prior art that reliable temperature uniformity cannot be achieved, the general idea of ​​the present invention is: to provide a converter liquid cooling device, on the one hand, the liquid cooling pipeline is a serial pipeline, which can achieve an absolutely balanced flow rate of the entire pipeline, and the liquid cooling pipeline can be effectively cleaned by high-pressure water injection; on the other hand, the liquid cooling pipeline passes through the projection areas of multiple power module areas one by one in the positive sequence along the flow direction of the liquid cooling medium and then enters the liquid cooling row. After coming out of the liquid cooling row, it turns around and passes through the projection areas of multiple power module areas one by one in the reverse sequence. Moreover, the liquid cooling pipeline presents a multi-segment curve structure in the projection area of ​​the power module area, and the liquid cooling pipeline is staggered when passing in the positive sequence and when passing in the reverse sequence, so that reliable temperature uniformity of the power module can be achieved.

[0078] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Typical embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0079] refer to Figure 1-5 The converter liquid cooling device of the present invention comprises a heat dissipation system, and the heat dissipation system comprises a liquid cooling plate 4, a liquid cooling row 9, a liquid cooling pipeline 2, etc. The circuit composition of the converter comprises a circuit structure such as a power module.

[0080] refer to Figure 3-5 The liquid cooling plate 4 is divided into an upper and lower layer of liquid cooling plates. The upper layer of liquid cooling plate is a liquid cooling plate 29 near the power module side, and the circuit structure such as the power module is to be arranged on its upper surface. The lower layer of liquid cooling plate is a liquid cooling plate 36 far from the power module side. The upper layer of liquid cooling plate is configured with a liquid cooling system including the liquid cooling pipeline, such as Figure 1 The lower liquid cooling plate is equipped with a small air conditioning system, such as Figure 2 As shown. The small air conditioning system on the second floor is coupled to the liquid cooling system on the first floor through the liquid cooling plate 4. Of course, the small air conditioning system on the second floor is not necessary, but it can be used as a preferred solution. The liquid cooling system on the first floor is introduced first, and then the small air conditioning system on the second floor is introduced.

[0081] refer to Figure 1 , a liquid cooling pipeline 2 of a layer of liquid cooling system is arranged inside the liquid cooling plate 4 (specifically a layer of liquid cooling plate 29) for circulating liquid cooling medium. It can be understood that the portion of the liquid cooling pipeline 2 outside the liquid cooling plate 4 is a welded metal pipeline, and the portion inside the liquid cooling plate 4 is a milled groove. The upper surface of the liquid cooling plate 4 is configured with multiple power module areas, cold row areas, inductor areas, and heating areas. The power module area is used to install power modules. The cold row area is used to install the liquid cooling row 9, and the function of the liquid cooling row 9 is to dissipate heat to the internal environment of the device. The inductor area is used to install the inductor unit 17. The heating area is used to heat the discharged liquid cooling medium to improve the heat exchange efficiency.

[0082] According to the flow direction of the liquid cooling medium in the liquid cooling pipeline 2, the order of the power modules gradually approaching the liquid cooling row 9 is defined as a positive order, and the order of the power modules gradually away from the liquid cooling row 9 is defined as a reverse order.

[0083] In this embodiment, the inductor region and the plurality of power module regions are located on the same side of the cold row region. The plurality of power module regions are arranged as a whole, with the inductor region and the heating region, at intervals along the second horizontal direction. The plurality of power module regions are arranged evenly at intervals in sequence along the first horizontal direction. In this embodiment, the liquid cooling plate 4 is a rectangular plate. When it is placed horizontally, the first horizontal direction can be understood as the left-right direction, and the second horizontal direction can be understood as the front-back direction. The plurality of power module regions, the inductor region, and the heating region are arranged at intervals in the order from front to back, and the cold row region is arranged on the left side of the liquid cooling plate 4. In this embodiment, the water inlet of the liquid cooling pipeline 2 is connected to the liquid cooling medium inlet terminal 1, and the water outlet is connected to the liquid cooling medium outlet terminal 20. The liquid cooling medium inlet terminal 1 and the liquid cooling medium outlet terminal 20 are both on the right side of the cold plate 4. The liquid cooling medium inlet terminal 1 is close to the front of the liquid cooling plate 4, and the liquid cooling medium outlet terminal 20 is close to the back of the liquid cooling plate 4. Therefore, the order of the plurality of power modules from right to left is positive order, and the order from left to right is reverse order.

[0084] In this embodiment, the power modules are specifically three IGBTs, which are respectively denoted as power modules 5, 6, and 7, and are evenly spaced in a straight line in a positive order (from right to left). It can be understood that the number of power modules is not limited to three, and the arrangement is not limited to a straight line arrangement. This embodiment is arranged in a straight line for the purpose of compact layout.

[0085] The liquid cooling pipeline described in this embodiment is a serial pipeline, so it can achieve an absolutely balanced flow rate of the entire pipeline, and the liquid cooling pipeline can be effectively cleaned by high-pressure water injection. However, the initial temperature of the water inlet of the liquid cooling pipeline 2 passes through the hot spots such as power modules 5-7, and the water temperature gradually increases, and reliable temperature uniformity cannot be achieved. For this reason, the liquid cooling pipeline 2 designed in this embodiment is to pass through the projection areas of multiple power module areas one by one in the positive order along the flow direction of the liquid cooling medium (that is, pass through power modules 5, 6, and 7 in sequence) and then enter the liquid cooling row 9. After coming out of the liquid cooling row 9, it turns around and passes through the projection areas of multiple power module areas one by one in the reverse order (that is, pass through power modules 7, 6, and 5 in sequence), and the liquid cooling pipeline 2 presents a multi-segment curve structure in the projection area of ​​the power module area, and it is staggered when passing in the positive order and when passing in the reverse order. It can be understood that, unless otherwise specified, the pipelines inside the same layer of liquid cooling plate are all in the same plane or at the same height.

[0086] The multi-segment curve structure here mainly emphasizes that the pipeline in the projection area of ​​the power module area is not a straight pipeline, but a curve, divided into multiple sections. For example, multiple straight bends also belong to the multi-segment curve structure mentioned in this article, and irregular bends also belong to the multi-segment curve structure mentioned in this article. In particular, in this embodiment, the pipeline of the liquid cooling pipeline 2 in the projection area of ​​the power module area is a serpentine pipeline running along the first horizontal direction, that is, the overall trend is still along the first horizontal direction (from right to left before entering the cold row 9, and from left to right after exiting the cold row) through the projection area of ​​the power module area, but it is not a straight line, but a repeated circuitous crossing, roughly a serpentine pipeline. The serpentine pipeline can be a shape similar to a sine wave, a rectangular wave, etc., and the comparison is not limited. In this embodiment, the serpentine pipeline is specifically formed by repeatedly turning and U-turning a straight pipeline perpendicular to the direction of travel. For example, the serpentine pipeline traveling from left to right is a straight pipeline traveling from back to front, and when it is about to reach the front boundary of the area, it turns to the left (before entering the cold row 9) / right (after exiting the cold row 9), and then travels from front to back, and when it is about to reach the rear boundary of the area, it continues to turn to the left / right, and then travels from back to front, and so on. In this way, the serpentine pipeline can be used to fully fill the projection area of ​​the power module area, and try to ensure that it is consistent with the general trend of the flow of the liquid cooling medium. Because in this embodiment, the liquid cooling pipeline 2 passes through the projection area of ​​the power module area twice, that is to say, the pipeline of the liquid cooling pipeline 2 in the projection area of ​​the power module area is two serpentine interlaced pipelines. The so-called interlacing refers to that one party always maintains a fixed spacing relative to the other party (the spacing may have error fluctuations, especially the turning and U-turning parts), and will not intersect. We call the pipeline passing through the power module area in positive sequence pipeline A, and the pipeline passing through the power module area in reverse sequence pipeline B. It should be noted that the parts of pipeline A and pipeline B outside the projection area of ​​the power module area generally move in a straight line along the first horizontal direction, and pipelines A and B are separated as much as possible. For example, the part of pipeline A outside the projection area of ​​the power module area is as close to the front boundary of the power module area as possible, and the part of pipeline B outside the projection area of ​​the power module area is as close to the rear boundary of the power module area as possible.

[0087] In addition, it can be understood that the projection area of ​​a certain area on the upper surface of the liquid cooling plate 4 refers to a space inside the liquid cooling plate 4 that is directly below the certain area and whose boundary is completely consistent with the shape of the certain area.

[0088] The liquid cooling row 9 is connected in series to a main liquid cooling system. The main function of the liquid cooling row 9 is to dissipate heat from the internal environment of the converter. Specifically, the liquid cooling pipeline 2 forms a serpentine pipeline in the liquid cooling row 9, such as Figure 4 The metal tube 10 is shown in FIG. Figure 3-4, the liquid cooling row 9 is vertically set up on the left side of the liquid cooling plate 4, and is perpendicular to the arrangement direction of the multiple power modules 5-7 areas. A fan (not shown) is arranged on the right side of the liquid cooling row 9. A large number of heat dissipation fins 8 arranged at intervals are protruded on the heat dissipation surfaces on the left and right sides of the liquid cooling row 9, respectively. The heat dissipation fins 8 are perpendicular to the heat dissipation surfaces. A single heat dissipation fin 8 is a sheet-like structure extending in the up-down direction, and the heat dissipation fins 8 on the same side are arranged in the front-to-back direction. It can also be changed to a single heat dissipation fin 8 is a sheet-like structure extending in the front-to-back direction, and the heat dissipation fins 8 on the same side are arranged in the up-to-down direction. The liquid cooling pipeline 2 enters the position of the liquid cooling row 9 near the first vertical edge after passing through the projection area of ​​the multiple power module areas in a positive sequence, and vertically moves upward in the liquid cooling row 9 to the top position of the liquid cooling row 9, and then moves in a serpentine manner from top to bottom to the bottom position of the liquid cooling row 9, and passes out of the liquid cooling row 9 from the position of the liquid cooling row 9 near the second vertical edge. The first vertical side and the second vertical side are defined as follows: the first vertical side refers to the vertical side (front side) relatively closer to the power module, and the second vertical side refers to the vertical side (rear side) relatively closer to the inductor module.

[0089] Continue to refer Figure 1 The liquid cooling pipeline 2 is connected to the liquid cooling medium inlet terminal 1 before passing through the projection areas of the multiple power module areas in the forward sequence, passes through the liquid cooling row 9, and then passes through the projection areas of the multiple power module areas in the reverse sequence, and then enters and passes through the projection area of ​​the inductor area nearby, and enters the projection area of ​​the heating area nearby after coming out of the inductor area, and is connected to the liquid cooling medium outlet terminal 20 after coming out of the projection area of ​​the heating area. The heating area cooperates with the small air-conditioning system on the second floor, and the efficiency of heat exchange is improved by raising the temperature of this area. The placement holes 3 and 35 are used to place sensors to detect the inlet and outlet temperatures to ensure that the inlet and outlet water temperatures are within the working range.

[0090] The spans of the inductor area and the temperature rise area in the left and right directions are roughly the same as the span of the area formed by all the power module areas as a whole. The liquid cooling pipeline 2 forms a serpentine pipeline running from front to back in the projection area of ​​the inductor area. The bridge arm side inductor unit 17 can be designed as an integrated unit or placed independently. Because the inductor temperature characteristics are good, in this embodiment, the inductor unit 17 is intended to be integrated into a metal shell 30 with three inductors, fixed by filling medium, and the inductor heat dissipation surface is attached to the liquid cooling plate 4. The liquid cooling pipeline 2 also forms a serpentine pipeline running from front to back in the projection area of ​​the temperature rise area.

[0091] The principle of achieving uniform temperature in this embodiment is described below.

[0092] like Figure 1As shown, the liquid cooling medium enters the liquid cooling pipeline 2 through the liquid cooling medium inlet terminal 1, passes through the power modules 5, 6, and 7 in sequence, absorbs part of the heat and enters the liquid cooling row 9. There is a fan on the right side of the liquid cooling row 9 to exchange heat with the space. The heat dissipation fins 8 increase the heat exchange efficiency of the liquid cooling medium. The metal tube 10 is the liquid cooling pipeline in the liquid cooling row 9. The liquid cooling row 9 has the heat absorption function of the evaporator in the air-conditioning system. After passing through the liquid cooling row 9, the liquid cooling medium passes through the three power modules in reverse order, that is, it passes through modules 7, 6, and 5 in sequence, forming an interlaced position with the liquid cooling medium that initially circulates counterclockwise, so as to achieve a uniform temperature effect on the power modules. T5, T6, and T7 represent the temperatures on the right side of modules 5, 6, and 7, and Ts 5, Ts 6, and Ts 7 represent the temperatures on the left side of modules 5, 6, and 7. Then the temperatures of each power module satisfy the following relationship:

[0093]

[0094] Among them, ΔT1 is the temperature rise of the liquid-cooling medium of module 6 caused by the heat generated by module 5, ΔT2 is the temperature rise of the liquid-cooling medium of module 7 caused by the heat generated by module 6, ΔT3 is the temperature rise of the liquid-cooling medium generated by the liquid cooling row from the internal ambient heat of the converter module, ΔT4 is the temperature rise of the liquid-cooling medium of module 6 caused by the heat generated by module 7, and ΔT5 is the temperature rise of the liquid-cooling medium of module 5 caused by the heat generated by module 6.

[0095] Among them, ΔT1≈ΔT2≈ΔT4≈ΔT5=ΔT, substituting relationship (1): T5+Ts5=T5+T5+ΔT1+ΔT2+ΔT3+ΔT4+ΔT5=2*T5+ΔT3+ΔT1+ΔT2+ΔT4+ΔT5; T6+Ts6=T5+ΔT1 +T5+ΔT1+ΔT2+ΔT3+ΔT4=2*T5+ΔT3+ΔT1+ΔT1+ΔT2+ΔT4; T7+Ts7=T5+ΔT1+ΔT2+T5+ΔT1+ΔT2+ΔT3=2*T5+ΔT3+ΔT1+ΔT2+ΔT1+ΔT2;

[0096]

[0097] It can be seen that the power module can be evenly heated in this way. After passing through the power module, the liquid cooling medium is connected to the nearest layer of pipeline in the inductor area on the bridge arm side. After passing through the inductor on the bridge arm side, it enters the temperature rising area for heat exchange in the second layer of simulated condenser, and finally flows out through the liquid cooling medium outlet terminal 20, and the liquid cooling medium circulation in the first layer of pipeline is completed.

[0098] Furthermore, in this embodiment, power module temperature detection points are respectively configured on the left and right sides of the power module area to monitor the temperature difference between the left and right sides of the power module, and all the power module temperature detection points are arranged parallel to the left and right directions. Figure 1In the figure, 11, 12, 13, 14, 15, and 16 are temperature detection points beside the IGBT power module, and the temperatures T11, T12, T13, T14, T15, and T16 are detected respectively, and the temperature difference between T16 and T15, T14 and T13, and T12 and T11 can be determined accordingly. If the temperature difference between the two sides of the power module is detected to be greater than the first high temperature threshold TY1, it is considered that the heat generation is too large, and the internal abnormality of the power module is further judged in combination with the internal temperature monitoring of the power module; if the temperature difference between the two sides of the power module is detected to be less than the first low temperature threshold TY0, the internal temperature monitoring of the power module is further judged. If the internal temperature monitoring of the power module shows that the temperature does not meet the normal working conditions (there is a certain temperature that will not be too low during normal working), it is judged that the power module has not started; if the internal temperature monitoring of the power module shows that the temperature meets the normal working conditions, it is judged that the abnormal bonding between the power module and the liquid cooling plate is that the module is not effectively fixed, or the abnormal application of the heat dissipation silicone grease leads to an increase in thermal resistance, and it is necessary to stop the machine for inspection.

[0099] Furthermore, in this embodiment, inductor unit temperature detection points are respectively configured on the left and right sides of the inductor region to monitor the temperature difference between the left and right sides of the inductor unit, and the inductor unit temperature detection points on the left and right sides are arranged parallel to the left and right directions. Figure 1 18 and 19 are the temperature detection points on the left and right sides of the inductor unit on the bridge arm side. If the temperature difference between the two sides of the inductor unit is detected to be greater than the second high temperature threshold TYL1, that is, the temperature difference between T19 and T18 is greater than the threshold TYL1, it is considered that the inductor is heating abnormally. Combined with the body temperature detection result of the inductor unit, it is judged whether a false alarm occurs. If there is no false alarm, then: continue to combine the current detection of the inductor unit to judge whether it is caused by overcurrent, and combine the flow detection to judge whether it is caused by leakage due to reduced flow. If it is detected that the temperature difference between the two sides of the inductor unit is less than the second low temperature threshold TYL0, then combined with the body temperature detection result of the inductor unit, it is judged whether it is an inductor assembly problem, silicone grease application problem, etc. In addition, a plurality of inductor temperature detection points are configured around the inductor under each of the inductors in the inductor unit to monitor the temperature difference on both sides of the inductor. Based on this, the temperature difference between the inductors can be judged, and the temperature difference of each phase can be judged. Combined with the current and voltage detection, it is judged whether there is an abnormal working condition of each phase.

[0100] Next, we will introduce small air conditioning systems.

[0101] The small air-conditioning system of the present invention can be freely disassembled or assembled. When temperature abnormalities occur in the power module area, the cold row area or the inductor area, the small air-conditioning system can realize low-temperature cooling of the power module area, the cold row area and the inductor area.

[0102] refer to Figure 2, the small air-conditioning system includes a second-layer pipeline 37, a micro compressor 28, and a throttling expansion valve 27 of the small air-conditioning system. The pipeline 37 includes a first air-conditioning pipeline 22 and a second air-conditioning pipeline 26 located inside the second-layer liquid cooling plate 36, and pipelines 31-34 passing through the second-layer liquid cooling plate 36 and the first-layer liquid cooling plate 29. The compressor 28 and the throttling expansion valve 27 are installed on the entire upper surface of the liquid cooling plate 4, and the outlet and inlet of the first air-conditioning pipeline 22 are respectively connected to the compressor 28 and the throttling expansion valve 27 after passing through the liquid cooling plate 4 from bottom to top, and the outlet and inlet of the second air-conditioning pipeline 26 are respectively connected to the throttling expansion valve 27 and the compressor 28 after passing through the liquid cooling plate 4 from bottom to top. Figure 3 31 is a connecting pipeline for leading out the throttling expansion valve of the second layer, connected to the outlet of the throttling expansion valve. 32 is a connecting pipeline for leading out the throttling expansion valve of the second layer, connected to the inlet of the throttling expansion valve. 33 is a connecting pipeline for leading out the micro compressor of the second layer, connected to the outlet of the micro compressor. 34 is a connecting pipeline for leading out the micro compressor of the second layer, connected to the inlet of the micro compressor.

[0103] The first air conditioning pipeline 22 passes through the projection area of ​​the plurality of power module regions to act as a simulated evaporator to cool the power modules located directly above it. Figure 2 As shown in the area 21 in the figure. The first air conditioning pipeline 22 forms a serpentine pipeline in the area 21, and the traveling direction of the serpentine pipeline is the second horizontal direction (specifically from front to back according to the medium flow direction), so that the same cooling effect can be achieved for the three power modules 5-7 above, ensuring that the power modules 5-7 are kept at a uniform temperature.

[0104] The second air conditioning pipeline 26 passes through the projection area of ​​the temperature increase area to serve as a simulated condenser to increase the temperature of the liquid cooling pipeline located directly above it. Figure 2 As shown in the area 25 in the figure. The second air conditioning pipeline is also formed as a serpentine pipeline in the area 25, and the traveling direction of the serpentine pipeline is also the second horizontal direction (specifically from front to back according to the medium flow direction).

[0105] refer to Figure 7The heat dissipation circulation direction of the small air conditioning system on the second floor is from the compressor 28 to the simulated condenser (pipeline in area 25), through the throttling expansion valve 27, to the simulated evaporator (pipeline in area 21), and then back to the compressor 28. The compressor compresses the low-temperature and low-pressure gas to a high-temperature and high-pressure gas state. The condenser exchanges the heat of the high-temperature and high-pressure gaseous medium to become a medium-temperature and high-pressure gas state. The throttling expansion valve throttles the medium-temperature and high-pressure gas state to become a low-temperature and low-pressure liquid mist. The medium absorbs the heat of the heat dissipation object through the evaporator and becomes a low-temperature and low-pressure gas state and returns to the compressor. A temperature sensor 23 is installed in the pipeline between the throttling expansion valve and the simulated evaporator, and a temperature sensor 24 is installed in the pipeline between the simulated evaporator and the compressor. The flow rate of the liquid cooling medium in the pipeline is controlled in conjunction with the temperature sensor.

[0106] The characteristic of the two-layer small air-conditioning system in this embodiment is that it makes full use of the flow channel of the liquid cooling plate itself, simulates the operation of the evaporator and condenser, and is designed in a stacked manner with the first-layer liquid cooling system. Only a micro compressor 28 and a throttling expansion valve 27 are required to realize the function of the small air-conditioning system. When abnormal operation occurs, the temperature of the power module 5-7, the inductor unit 17, and the space heat dissipation liquid cooling row 9 is too high or the local temperature is too high, then the control core issues an instruction to start the two-layer small air-conditioning system, and the power module 5-7, the inductor unit 17, and the space heat dissipation liquid cooling row 9 are realized through the independent circulation small air-conditioning system, so as to improve the cooling efficiency. At the same time, by simulating the condenser, the liquid cooling medium temperature of the liquid cooling pipeline 2 in the simulated condenser area 25, that is, the outlet temperature, is raised to achieve a large temperature difference between the outlet water temperature and the inlet water temperature, thereby improving the heat exchange efficiency of the external fan of the first-layer liquid cooling system, because a complete heat exchange of a layer includes external heat exchange components, and the higher the temperature of the liquid cooling medium and the greater it is than the space environment temperature (that is, the temperature gradient is large), the better the heat exchange effect.

[0107] In this embodiment, a layer of liquid cooling system is the main system of the converter, which consists of a dry cooler (the name of a liquid cooling unit, which can circulate water in the pipeline through an internal water pump), liquid cooling pipelines, an upper liquid cooling plate, a liquid cooling row, a temperature and flow detection system, a mixture of ethylene glycol and water flowing in the liquid cooling pipeline, etc. This system can meet the working conditions of most friendly working conditions. The second-layer small air-conditioning system is composed of a lower-layer liquid cooling plate, a compressor, a throttling expansion valve, a refrigerant liquid cooling medium flowing in the pipeline, etc., and is coupled with the first-layer main system through the liquid cooling plate. The pipelines of the second-layer small air-conditioning system can simulate the effects of the condenser and evaporator. Part of the pipelines on the first layer are the heat dissipation objects and fan heat dissipation devices. Specifically, the upper layer of zone 21 and zone 17 are the objects to be dissipated by the second-layer small air-conditioning system. The upper layer pipeline of zone 25 simulates the fan of the air-conditioning system that cools the simulated condenser in zone 25. Normal air conditioning should have a fan to force the condenser to blow air cooling into the space. In the present invention, the corresponding pipeline on the upper layer of zone 25 is cleverly used to simulate the role of the fan, so as to absorb the heat of the condenser in zone 25, and then release it into the space through the external dry cooler on the first layer. The second-layer liquid cooling system is independently configured in each converter to assist the main liquid cooling system on the upper layer to operate in various harsh working conditions, such as high-temperature environments such as deserts and environments with harsh power grid environments.

[0108] Preferably, a semi-penetrating columnar liquid-cooled radiator with blind holes can also be designed, and a large number of columnar temperature sensors are buried in the blind holes, passing through the liquid cooling medium, and the depth from the upper surface of the liquid cooling plate does not exceed 1mm. The array distribution of sensors can form an accurate two-dimensional temperature gradient cloud map. The temperature shown in the cloud map is the combined temperature between the liquid cooling medium at each point and the IGBT mounted liquid cooling plate. According to the temperature cloud map information, the electronic expansion valve can be adjusted through the control circuit to control the change of water flow to achieve the purpose of temperature uniformity.

[0109] refer to Figure 6 ,After a layer of independent liquid cooling system is designed, the liquid cooling plates can be connected through pipelines to achieve series or / and parallel use, which can expand the power density of the converter itself.

[0110] In summary, the main beneficial effects of this embodiment are:

[0111] 1. The uniform temperature characteristics of the IGBT power module are achieved through the serpentine staggered design of the serial liquid cooling pipeline. In addition, the serial pipeline design scheme can add high-pressure water injection and flushing pipeline logic in the control logic, which is performed before startup and after shutdown respectively. In this way, the dirt can be cleaned through the sewage discharge device in the external circulation;

[0112] 2. The present invention adopts a double-layer liquid cooling system design. The first layer of liquid cooling system is the main liquid cooling system, which uses ethylene glycol aqueous solution as the liquid cooling medium, with high efficiency and low cost; the second layer of liquid cooling system is an auxiliary liquid cooling system, which simulates the functions of the condenser and evaporator with the help of the liquid cooling pipeline design of the liquid cooling plate itself. The present invention integrates a small phase change refrigeration system into the water cooling system. If the first layer of liquid cooling system cannot meet the temperature uniformity or cannot achieve cooling, the second layer of spare small air conditioner is turned on to increase the cooling capacity. Moreover, the second layer of liquid cooling system is cleverly coupled with the first layer of main liquid cooling system through the liquid cooling plate to achieve the low-temperature and efficient heat dissipation function of the heat-generating power module, and to raise the outlet water temperature to achieve the function of efficient heat dissipation from the outside of the first layer of main liquid cooling system to the space.

[0113] 3. The present invention cooperates with temperature detection at each point to determine whether the power module and the inductor module are assembled incorrectly, resulting in increased thermal resistance. It can also determine some severe working conditions and make corresponding adjustments.

[0114] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "front", "rear", "upper", "lower" and similar expressions used herein are for illustrative purposes only.

[0115] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0116] Terms including ordinal numbers such as "first", "second" and the like used in this specification may be used to describe various constituent elements, but these constituent elements are not limited by these terms. The purpose of using these terms is only to distinguish one constituent element from other constituent elements. For example, without departing from the scope of the present invention, the first constituent element may be named as the second constituent element, and similarly, the second constituent element may also be named as the first constituent element. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0117] In the specification provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0118] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this should not be interpreted as reflecting an intention that the claimed invention requires more features than those expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all of the features of the individual embodiments previously disclosed. Therefore, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0119] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0120] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A converter liquid cooling device, characterized in that: The device comprises at least one heat dissipation system, wherein the heat dissipation system comprises a liquid cooling plate and a liquid cooling pipeline arranged inside the liquid cooling plate for circulating a liquid cooling medium, wherein the upper surface of the liquid cooling plate is provided with a plurality of power module areas for installing power modules and a cold row area for installing a liquid cooling row for dissipating heat to the internal environment of the device, wherein the plurality of power module areas are arranged in sequence and spaced apart; The liquid cooling pipeline is a serial pipeline; the liquid cooling pipeline passes through the projection areas of the multiple power module areas one by one in a positive order along the flow direction of the liquid cooling medium and then enters the liquid cooling row, and after coming out of the liquid cooling row, turns around and passes through the projection areas of the multiple power module areas one by one again in a reverse order; The liquid cooling pipeline presents a multi-segment curve structure in the projection area of ​​the power module area, and is staggered when passing in a forward sequence and when passing in a reverse sequence.

2. The converter liquid cooling device according to claim 1, characterized in that: The upper surface of the liquid cooling plate is also configured with an inductor area for installing an inductor unit. The liquid cooling pipeline passes through the projection areas of the multiple power module areas in reverse order and then enters and passes through the projection area of ​​the inductor area.

3. The converter liquid cooling device according to claim 2, characterized in that: The liquid cooling plate is divided into two layers, the upper layer is configured with a liquid cooling system including the liquid cooling pipeline, and the lower layer is configured with a small air conditioning system, and the small air conditioning system is coupled with the liquid cooling system of the upper layer through the liquid cooling plate; The small air conditioning system is used to achieve low-temperature cooling of the power module area, the cold row area, and the inductor area when abnormal temperature occurs in the power module area, the cold row area, or the inductor area.

4. The converter liquid cooling device according to claim 3, characterized in that: A temperature rise area is also allocated on the upper surface of the liquid cooling plate, and the liquid cooling pipeline is connected to the liquid cooling medium inlet terminal before passing through the projection area of ​​the plurality of power module areas in a positive sequence; the liquid cooling pipeline enters the projection area of ​​the temperature rise area nearby after coming out of the inductor area, and is connected to the liquid cooling medium outlet terminal after coming out of the projection area of ​​the temperature rise area; The small air-conditioning system comprises a first air-conditioning pipeline, a compressor, a second air-conditioning pipeline, and a throttling expansion valve, wherein the compressor and the throttling expansion valve are mounted on the upper surface of the liquid cooling plate, the outlet and the inlet of the first air-conditioning pipeline are respectively connected to the compressor and the throttling expansion valve after passing through the liquid cooling plate from bottom to top, and the outlet and the inlet of the second air-conditioning pipeline are respectively connected to the throttling expansion valve and the compressor after passing through the liquid cooling plate from bottom to top; The first air-conditioning pipeline passes through the projection area of ​​the multiple power module areas to act as a simulated evaporator to cool the power modules directly above it; the second air-conditioning pipeline passes through the projection area of ​​the heating area to act as a simulated condenser to heat the liquid cooling pipeline directly above it.

5. The converter liquid cooling device according to claim 4, characterized in that: The liquid cooling pipeline in the projection area of ​​the power module area is two serpentine interlaced pipelines, the liquid cooling pipeline forms a serpentine pipeline in the liquid cooling row, the liquid cooling pipeline forms a serpentine pipeline in the projection area of ​​the inductor area, and the liquid cooling pipeline forms a serpentine pipeline in the projection area of ​​the temperature rise area; The first air conditioning pipeline forms a serpentine pipeline in the projection area of ​​the plurality of power module areas, and the second air conditioning pipeline forms a serpentine pipeline in the projection area of ​​the temperature rising area.

6. The converter liquid cooling device according to claim 4, characterized in that: The multiple power module areas are evenly spaced apart along the first horizontal direction, the inductor area and the multiple power module areas are located on the same side of the cold row area, and the multiple power module areas are arranged as a whole with the inductor area and the temperature rising area along the second horizontal direction.

7. The converter liquid cooling device according to claim 2, characterized in that: Power module temperature detection points are respectively configured on both sides of the power module area to monitor the temperature difference on both sides of the power module, and all the power module temperature detection points are arranged at intervals parallel to the first horizontal direction, and the first horizontal direction refers to the arrangement direction of the multiple power module areas; Inductor unit temperature detection points are respectively configured on both sides of the inductor area to monitor the temperature difference on both sides of the inductor unit, and the inductor unit temperature detection points on both sides are arranged at intervals parallel to the first horizontal direction; the inductor unit includes multiple inductors, and multiple inductor temperature detection points are configured around the inductor under each inductor to monitor the temperature difference on both sides of the inductor.

8. The converter liquid cooling device according to claim 7, characterized in that: The controller of the converter is used to analyze the detection results of the temperature detection points of the power module and the inductor unit: If it is detected that the temperature difference between the two sides of the power module is greater than the first high temperature threshold, it is considered that the heat generation is too large, and the internal abnormality of the power module is further determined in combination with the internal temperature monitoring condition of the power module; If it is detected that the temperature difference on both sides of the power module is less than the first low temperature threshold, the internal temperature monitoring condition of the power module continues to be judged. If the internal temperature monitoring of the power module shows that the temperature does not meet the normal working conditions, it is judged that the power module is not started; if the internal temperature monitoring of the power module shows that the temperature meets the normal working conditions, it is judged that the power module is abnormally fitted to the liquid cooling plate or the heat dissipation silicone grease is abnormally applied. If it is detected that the temperature difference between the two sides of the inductor unit is greater than the second high temperature threshold, it is considered that the inductor is heating abnormally, and combined with the body temperature detection result of the inductor unit, it is determined whether a false alarm occurs. If there is no false alarm, then: continue to combine the current detection of the inductor unit to determine whether it is caused by overcurrent, and combine the flow detection to determine whether it is caused by leakage due to reduced flow; If it is detected that the temperature difference between the two sides of the inductor unit is less than the second low temperature threshold, it is determined whether it is a problem of inductor assembly or silicone grease application in combination with the temperature detection result of the inductor unit body.

9. The converter liquid cooling device according to claim 1, characterized in that: The liquid cooling row is vertically arranged on the liquid cooling plate and perpendicular to the arrangement direction of the plurality of power module regions, and a plurality of heat dissipation fins perpendicular to the heat dissipation surfaces are protruded from the heat dissipation surfaces on both sides of the liquid cooling row; The liquid cooling pipeline passes through the projection areas of the multiple power module areas in a positive sequence and enters the position of the liquid cooling row near the first vertical edge, goes vertically upward in the liquid cooling row to reach the top position of the liquid cooling row, then moves in a serpentine manner to reach the bottom position in the liquid cooling row, and passes through the position of the liquid cooling row near the second vertical edge to the outside of the liquid cooling row.

10. The converter liquid cooling device according to claim 1, characterized in that: The liquid cooling plate is also embedded with distributed columnar temperature sensors in an array to form a two-dimensional temperature gradient cloud map, and the depth of the columnar temperature sensors from the upper surface of the liquid cooling plate does not exceed 1 mm.

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