A microchannel liquid-cooled high-voltage DC filter core and its filter

Abstract

This utility model relates to the field of liquid cooling technology, and provides a high-voltage DC filter core and filter with integrated microchannel liquid cooling. The core includes a magnetic ring body and microchannel cooling pipes. The magnetic ring body is made of nanocrystalline ribbon wound into a closed hollow ring structure, with a single-ended spiral groove formed along its circumference on the outer surface. The microchannel cooling pipes are arranged along the single-ended spiral grooves, and at least partially embedded within them. The inlet of the microchannel cooling pipes is located at the center of the magnetic ring, and the outlet is located on the outer periphery. The microchannel cooling pipes are used for heat exchange of the cooling medium to remove the heat generated by the magnetic ring body. This application eliminates the multi-layer thermal resistance found in traditional solutions, effectively improving the heat dissipation of the magnetic core and ensuring that the temperature rise of the magnetic core under full load is within the allowable value.

Description

Technical Field

[0001] This utility model relates to the field of liquid cooling technology, and in particular to a high-voltage DC filter core with integrated microchannel liquid cooling and the filter thereof. Background Technology

[0002] With the popularization of high-voltage electric drive systems for new energy vehicles towards 800V high-voltage platforms and SiC devices, the system switching frequency has been greatly increased to hundreds of kHz or even MHz. Traditional DC port filters have exposed many technical bottlenecks in terms of heat dissipation, high-frequency performance, size and reliability, which urgently need to be solved.

[0003] Traditional filter cooling solutions often employ external liquid cooling plates or air-cooled heat sinks, resulting in excessively long heat dissipation paths and high thermal resistance. Heat must be transferred from inside the magnetic core to the potting material, and then conducted to the liquid cooling plate, leading to low heat dissipation efficiency. Taking a 400V / 200A system as an example, with a traditional liquid cooling plate solution, the hot spot temperature inside the nanocrystalline magnetic core can reach 125℃, and its permeability μi drops from an initial 50,000 to 20,000, a decrease of up to 60%. This severely affects the high-frequency noise suppression capability and restricts the filter's performance under high-frequency conditions.

[0004] To meet heat dissipation requirements, traditional filters require additional components such as liquid cooling plates and heat dissipation fins, and adopt a stacked structure, resulting in a large filter size. This makes it difficult to arrange the filter compactly in the limited space of new energy vehicles, thus limiting the improvement of system power density. Utility Model Content

[0005] This invention provides an integrated microchannel liquid-cooled high-voltage DC filter core and its filter, which solves the defects of existing high-voltage DC filters for new energy vehicles, such as low heat dissipation efficiency leading to limited high-frequency performance, large size, and insufficient reliability. It eliminates the multi-layer thermal resistance in traditional solutions, effectively improves the heat dissipation effect of the core, and ensures that the temperature rise of the core is within the allowable value under full load conditions.

[0006] This utility model provides an integrated microchannel liquid-cooled high-voltage DC filter core, comprising:

[0007] The magnetic ring body is made of nanocrystalline ribbon wound into a closed hollow ring structure, and a single-headed spiral groove is opened on the outer surface of the magnetic ring body along its own circumference.

[0008] The microchannel cooling pipeline is arranged along the single-ended spiral groove and is at least partially embedded in the single-ended spiral groove. The inlet of the microchannel cooling pipeline is located at the center of the magnetic ring, and the outlet of the microchannel cooling pipeline is located on the outer periphery of the magnetic ring. The microchannel cooling pipeline is used to allow the cooling medium to circulate and exchange heat to remove the heat generated by the magnetic ring body.

[0009] According to the present invention, a high-voltage DC filter core with integrated microchannel liquid cooling is provided. The magnetic ring body has an upper end face and a lower end face that are arranged opposite to each other along its own axial direction. The upper end face and the lower end face are respectively provided with a single-headed spiral groove. The microchannel cooling pipeline includes an upper microchannel cooling pipeline and a lower microchannel cooling pipeline. The upper microchannel cooling pipeline and the lower microchannel cooling pipeline are arranged in a coaxial dual-channel structure and are respectively arranged in the single-headed spiral grooves corresponding to the upper end face and the lower end face.

[0010] According to the present invention, a high-voltage DC filter core with integrated microchannel liquid cooling is provided, which further includes a connecting channel. The connecting channel extends along the axis of the magnetic ring body itself and is attached to the inner sidewall of the magnetic ring body. The connecting channel is connected between the upper microchannel cooling pipe and the lower microchannel cooling pipe.

[0011] According to the present invention, a high-voltage DC filter core with integrated microchannel liquid cooling is provided, wherein the slot spacing of the upper microchannel cooling pipe or the lower microchannel cooling pipe is equidistant from the center outward.

[0012] According to the present invention, a high-voltage DC filter core with integrated microchannel liquid cooling is provided, wherein the slot spacing of the upper microchannel cooling pipe or the lower microchannel cooling pipe gradually increases from the center outward.

[0013] According to the present invention, a high-voltage DC filter core with integrated microchannel liquid cooling is provided, wherein the single-headed spiral groove formed on the upper end face or the lower end face is connected to the inner wall surface and the outer wall surface of the magnetic ring body through the inner radial groove and the outer radial groove, respectively.

[0014] According to the present invention, a high voltage DC filter core with integrated microchannel liquid cooling is provided, wherein the outer surface of the magnetic ring body is formed by ultraviolet laser etching to form the single-headed spiral groove, and the machining accuracy of the single-headed spiral groove is less than or equal to 0.01 mm.

[0015] According to the present invention, a high-voltage DC filter core with integrated microchannel liquid cooling is provided, wherein the microchannel cooling pipeline is made of EPDM material.

[0016] According to the present invention, an integrated microchannel liquid-cooled high-voltage DC filter core is provided, which further includes a housing and a cover. The housing has an installation cavity that matches the magnetic ring body. One end of the housing is open and communicates with the installation cavity. The cover is closed on the open. The inlet and outlet of the microchannel cooling pipeline pass through the housing.

[0017] This utility model also provides a filter, including an integrated microchannel liquid-cooled high-voltage DC filter core as described in any of the above.

[0018] This invention provides an integrated microchannel liquid-cooled high-voltage DC filter core and its filter. The microchannel cooling pipes are arranged along a single-ended spiral groove on the outer surface of the magnetic ring body, and are at least partially embedded within the groove. This allows the cooling medium to directly contact the magnetic ring body (heat source), eliminating the need for intermediate media such as potting materials and liquid cooling plates as in traditional solutions. Direct heat exchange between the cooling medium and the magnetic ring body eliminates the multi-layer thermal resistance found in traditional solutions, effectively improving the core's heat dissipation and ensuring that the core's temperature rise under full load remains within acceptable limits. Furthermore, the inlet of the microchannel cooling pipes is located at the center of the magnetic ring, and the outlet is located on the outer periphery. This allows the cooling medium to enter from the center, flow evenly along the spiral grooves through various parts of the magnetic ring, and finally exit from the outer periphery. This creates a uniform and orderly flow path within the magnetic ring, effectively removing heat generated at different locations and preventing localized heat accumulation, thus improving the uniformity and effectiveness of heat dissipation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the integrated microchannel liquid-cooled high-voltage DC filter core provided by this utility model.

[0021] Figure 2 This is a schematic diagram showing the connection between the magnetic ring body and the microchannel cooling pipeline provided by this utility model.

[0022] Figure label:

[0023] 10. High-voltage DC filter core with integrated microchannel liquid cooling;

[0024] 100. Shell; 200. Cover; 300. Magnetic ring body; 310. Single-headed spiral groove; 320. Inner radial groove; 330. Outer radial groove; 340. Upper end face; 350. Lower end face; 360. Inner wall surface; 370. Outer wall surface; 400. Microchannel cooling pipeline; 500. Connecting flow channel. Detailed Implementation

[0025] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0026] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0028] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] The following is combined with Figure 1 and Figure 2 This paper provides a detailed description of an integrated microchannel liquid-cooled high-voltage DC filter core and its filter, through specific embodiments and application scenarios.

[0031] In the embodiments of this utility model, such as Figure 2 As shown, a high-voltage DC filter core 10 with integrated microchannel liquid cooling includes a magnetic ring body 300 and a microchannel cooling pipe 400. The magnetic ring body 300 is made of nanocrystalline ribbon wound into a closed hollow ring structure. A single-headed spiral groove 310 is formed on the outer surface of the magnetic ring body 300 along its circumference. The microchannel cooling pipe 400 is arranged along the single-headed spiral groove 310, and the microchannel cooling pipe 400 is at least partially embedded in the single-headed spiral groove 310. The inlet of the microchannel cooling pipe 400 is located at the center of the magnetic ring, and the outlet of the microchannel cooling pipe 400 is located on the outer periphery of the magnetic ring. The microchannel cooling pipe 400 is used to allow the cooling medium to circulate and exchange heat to remove the heat generated by the magnetic ring body 300.

[0032] The magnetic ring body 300 is constructed from nanocrystalline ribbon wound into a closed hollow ring structure. The nanocrystalline ribbon possesses extremely high permeability, enabling the magnetic ring body 300 to more effectively guide and concentrate magnetic lines of force when facing high-frequency electromagnetic interference at the DC port, thus enhancing its ability to suppress high-frequency interference signals. In the electric drive system of new energy vehicles, high-frequency switching operations generate a large amount of high-frequency noise. A magnetic ring with high permeability can significantly reduce the impact of this noise on the system, improving signal transmission quality and system stability.

[0033] The closed, hollow ring structure creates a continuous magnetic circuit, reducing magnetic leakage. Magnetic leakage leads to energy loss and electromagnetic interference leakage, affecting filter performance. The continuous magnetic circuit ensures that high-frequency interference signals are sufficiently attenuated within the magnetic ring, improving filtering effectiveness.

[0034] A single-ended spiral groove 310 is formed along its circumference on the outer surface of the magnetic ring body 300. This single-ended spiral groove 310 significantly increases the outer surface area of ​​the magnetic ring body 300, thereby increasing the contact area between the cooling medium and the magnetic ring body 300. According to the principle of heat transfer, the larger the contact area, the more heat can be transferred per unit time, resulting in better heat dissipation. This allows the magnetic ring to transfer heat to the cooling medium more quickly when it generates a large amount of heat, preventing excessive temperature from affecting its magnetic properties.

[0035] The microchannel cooling pipes 400 are arranged along the single-ended spiral grooves 310, and are at least partially embedded within the spiral grooves 310, allowing the cooling medium to directly contact the magnetic ring body 300. Compared to traditional heat dissipation methods, this design eliminates intermediate thermal resistance layers, such as potting materials and air gaps, significantly improving heat transfer efficiency. Heat can be directly transferred from the magnetic ring body 300 to the cooling medium, achieving rapid heat dissipation.

[0036] The embedded layout enhances the connection strength between the microchannel cooling pipes 400 and the magnetic ring body 300, improving the overall structural stability of the filter. In the vibration and shock environment of new energy vehicles, it prevents the cooling pipes from loosening or detaching, ensuring the normal operation of the cooling system.

[0037] The inlet of the microchannel cooling pipe 400 is located at the center of the magnetic ring, and the outlet is located on the outer periphery of the magnetic ring. The cooling medium enters from the center of the magnetic ring and flows outward along the spiral grooves. This flow pattern allows the cooling medium to evenly cover all parts of the magnetic ring, avoiding localized heat accumulation. Under full load conditions, the heat generated in all parts of the magnetic ring is relatively uniform. This uniform heat dissipation ensures the overall temperature uniformity of the magnetic ring and prevents a decrease in magnetic performance due to localized overheating.

[0038] The microchannel cooling pipe 400 is used for the flow and heat exchange of the cooling medium to remove the heat generated by the magnetic ring body 300. The cooling medium flows in the microchannel cooling pipe 400, acting as a heat transfer carrier to remove the heat generated by the magnetic ring body 300. Commonly used cooling media, such as coolant, have good thermal conductivity and fluidity, enabling them to quickly absorb heat and transfer it to an external radiator for heat dissipation, thereby achieving continuous cooling of the magnetic ring.

[0039] By promptly removing the heat generated by the magnetic ring body 300, the cooling medium can maintain the magnetic ring within a suitable operating temperature range. The magnetic properties of the magnetic core are highly sensitive to temperature; excessively high temperatures can lead to performance changes such as decreased permeability and increased coercivity, affecting the filtering effect of the filter. A stable temperature environment can ensure the stable performance of the magnetic core, improving the reliability and lifespan of the filter.

[0040] This application arranges a microchannel cooling pipe 400 along a single-ended spiral groove 310 formed on the outer surface of the magnetic ring body 300, and at least partially embeds it within the single-ended spiral groove 310. This allows the cooling medium to directly contact the magnetic ring body 300 (heat source), eliminating the need for intermediate media such as potting materials and liquid cooling plates to transfer heat as in traditional solutions. The cooling medium directly exchanges heat with the magnetic ring body 300, eliminating the multi-layer thermal resistance found in traditional solutions, effectively improving the heat dissipation of the magnetic core, and ensuring that the temperature rise of the magnetic core under full load is within allowable limits. Simultaneously, the inlet of the microchannel cooling pipe 400 is located at the center of the magnetic ring, and the outlet is located on the outer periphery of the magnetic ring. This allows the cooling medium to enter from the center of the magnetic ring, flow evenly along the spiral groove through various parts of the magnetic ring, and finally flow out from the outer periphery. Thus, the cooling medium forms a uniform and orderly flow path inside the magnetic ring, effectively carrying away heat generated at different locations within the magnetic ring, avoiding localized heat accumulation, and improving the uniformity and effectiveness of heat dissipation.

[0041] Reference Figure 2 According to the present invention, a high voltage DC filter core 10 with integrated microchannel liquid cooling is provided. The magnetic ring body 300 has an upper end face 340 and a lower end face 350 arranged opposite to each other along its own axial direction. The upper end face 340 and the lower end face 350 are each provided with a single-head spiral groove 310. The microchannel cooling pipe 400 includes an upper microchannel cooling pipe and a lower microchannel cooling pipe. The upper microchannel cooling pipe and the lower microchannel cooling pipe are arranged in a coaxial dual-channel structure and are respectively arranged in the single-head spiral groove 310 corresponding to the upper end face 340 and the lower end face 350.

[0042] Understandably, the upper end face 340 and lower end face 350 of the magnetic ring body 300 each have individually formed single-headed spiral grooves 310, and corresponding upper and lower microchannel cooling pipes are provided. Compared to setting a cooling structure only on a single end face, this greatly increases the contact area between the cooling medium and the magnetic ring body 300. When the cooling medium flows in the spiral grooves, it can more fully exchange heat with the surface of the magnetic ring, thereby more efficiently removing the heat generated by the magnetic ring during operation.

[0043] The coaxial dual-channel structure creates two independent heat dissipation circulation paths for the cooling medium within the magnetic ring. The upper and lower microchannel cooling pipes can target different areas of the magnetic ring for targeted heat dissipation, resulting in more uniform heat distribution. Simultaneously, this design facilitates rapid heat transfer from the inside of the magnetic ring to the outside. The convective heat transfer effect generated by the cooling medium flowing within the spiral grooves accelerates heat diffusion, reduces heat accumulation within the magnetic ring, and further improves heat dissipation efficiency.

[0044] Reference Figure 2According to the present invention, an integrated microchannel liquid-cooled high-voltage DC filter core 10 further includes a connecting channel 500, which extends along the axis of the magnetic ring body 300 and is attached to the inner sidewall of the magnetic ring body 300. The connecting channel 500 is connected to the upper microchannel cooling pipe and the lower microchannel cooling pipe.

[0045] Understandably, the connecting channel 500 extends along the axis of the magnetic ring body 300 and is attached to the inner wall, connecting the upper and lower microchannel cooling pipes. This allows the cooling medium to form a complete circulation loop between the upper and lower microchannel cooling pipes. The cooling medium flows in from the upper microchannel cooling pipe, passes through the connecting channel 500, flows into the lower microchannel cooling pipe, and finally returns to the cooling medium supply system, and vice versa. This continuous circulation effectively removes the heat generated by the magnetic core, ensuring the stable operation of the high-voltage DC filter under harsh operating conditions.

[0046] Reference Figure 2 According to the present invention, the slot spacing of the upper microchannel cooling pipe or the lower microchannel cooling pipe is equidistant from the center outwards in an integrated microchannel liquid-cooled high-voltage DC filter core 10.

[0047] Understandably, the equidistant slot spacing ensures a more uniform flow of the cooling medium on the surface of the magnetic ring body 300. Because the slot spacing is consistent, the flow path and flow rate distribution of the cooling medium between each slot are more uniform, thus avoiding localized overheating and improving the uniformity of heat dissipation.

[0048] In some embodiments, the slot spacing of the upper or lower microchannel cooling pipes gradually increases from the center outwards.

[0049] Understandably, during the operation of a high-voltage DC filter core, the central region often generates more heat and has a higher heat flux density due to factors such as concentrated current and high magnetic flux density. The design of gradually increasing slot spacing from the center outwards results in a smaller slot spacing in the central region, leading to a relatively larger number of microchannel cooling channels 400 per unit area. More microchannel cooling channels 400 mean a larger contact area between the cooling medium and the core surface, enabling more rapid absorption of the large amount of heat generated in the central region. This meets the heat dissipation requirements of the high heat flux density in the center and prevents problems such as decreased magnetic performance and insulation damage caused by overheating.

[0050] Reference Figure 2According to the present invention, a high voltage DC filter core 10 with integrated microchannel liquid cooling has a single-headed spiral groove 310 on the upper end face 340 or the lower end face 350, which is connected to the inner wall surface 360 ​​and the outer wall surface 370 of the magnetic ring body 300 through the inner radial groove 320 and the outer radial groove 330, respectively.

[0051] Understandably, the inner radial groove 320 extends from the spiral groove to the inner wall surface 360 ​​of the magnetic ring body 300. The main function of the inner radial groove 320 is to provide a channel for connecting the microchannel cooling pipe 400 embedded in the spiral groove with the connecting flow channel 500 located inside the magnetic ring. The upper microchannel cooling pipe and the lower microchannel cooling pipe can then be interconnected through the connecting flow channel 500 to form a complete cooling circulation loop.

[0052] The outer radial groove 330 extends from the spiral groove to the outer wall surface 370 of the magnetic ring. The main function of the outer radial groove 330 is to provide a channel for connecting the microchannel cooling pipe 400 embedded in the spiral groove to the external main cooling pipe, so that the cooling medium can enter the cooling pipe inside the magnetic core from the external system and flow out after completing heat exchange.

[0053] In some embodiments, a single-headed spiral groove 310 is formed on the outer surface of the magnetic ring body 300 by ultraviolet laser etching, and the machining accuracy of the single-headed spiral groove 310 is less than or equal to 0.01 mm.

[0054] Understandably, ultraviolet lasers possess extremely high energy density and extremely small spot size, enabling precision machining. High-precision spiral grooves provide accurate positioning and support for the microchannel cooling tubing 400 (typically flexible tubing such as EPDM). Once embedded, the tubing fits tightly against the groove wall, forming a good contact interface, minimizing contact thermal resistance, and ensuring efficient heat transfer from the magnetic ring body 300 to the cooling medium.

[0055] The machining accuracy is less than or equal to 0.01 mm, meaning that the width, depth, spacing, straightness, and roundness of the spiral trajectory of the channels can be precisely controlled within an extremely small error range. This provides an extremely precise installation position for the subsequent embedding of the microchannel cooling pipes 400.

[0056] In some embodiments, the microchannel cooling line 400 is made of EPDM material.

[0057] Understandably, EPDM (ethylene-propylene-diene monomer copolymer) rubber possesses excellent high-temperature resistance. In the operating environment of high-voltage DC filters in new energy vehicles, the magnetic core generates significant heat, and the microchannel cooling pipe 400 itself is also affected by heat radiation and coolant temperature. EPDM can maintain its physical and mechanical properties at high temperatures, resisting softening, deformation, or failure, thus ensuring the long-term stable operation of the cooling system under high-temperature conditions.

[0058] Reference Figure 1 According to the present invention, an integrated microchannel liquid-cooled high-voltage DC filter core 10 also includes a housing 100 and a cover 200. The housing 100 has an installation cavity that matches the magnetic ring body 300. One end of the housing 100 is open and communicates with the installation cavity. The cover 200 covers the open. The inlet and outlet of the microchannel cooling pipe 400 pass through the housing 100.

[0059] It is understood that this embodiment introduces a housing 100 and a cover 200, and installs the magnetic ring body 300 therein. The encapsulation is completed by covering and pipe penetration, which not only provides physical protection and structural support for the magnetic core and realizes modular integration, but also ensures the sealing of the cooling system and improves the overall safety.

[0060] This utility model also provides a filter, which includes the above-mentioned integrated microchannel liquid-cooled high-voltage DC filter core 10. The specific structure of the integrated microchannel liquid-cooled high-voltage DC filter core 10 is as described in the above embodiments. It can be understood that since the above-mentioned integrated microchannel liquid-cooled high-voltage DC filter core 10 is used in the filter, the embodiments of this filter include all the technical solutions of all the embodiments of the above-mentioned integrated microchannel liquid-cooled high-voltage DC filter core 10, and the technical effects achieved are exactly the same, so they will not be described again here.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An integrated micro-channel liquid-cooled high voltage direct current filter magnetic core, characterized by, include: The magnetic ring body is made of nanocrystalline ribbon wound into a closed hollow ring structure, and a single-headed spiral groove is opened on the outer surface of the magnetic ring body along its own circumference. The microchannel cooling pipeline is arranged along the single-ended spiral groove and is at least partially embedded in the single-ended spiral groove. The inlet of the microchannel cooling pipeline is located at the center of the magnetic ring, and the outlet of the microchannel cooling pipeline is located on the outer periphery of the magnetic ring. The microchannel cooling pipeline is used to allow the cooling medium to circulate and exchange heat to remove the heat generated by the magnetic ring body.

2. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of claim 1, wherein, The magnetic ring body has an upper end face and a lower end face that are arranged opposite to each other along its own axial direction. The upper end face and the lower end face are each provided with a single-headed spiral groove. The microchannel cooling pipeline includes an upper microchannel cooling pipeline and a lower microchannel cooling pipeline. The upper microchannel cooling pipeline and the lower microchannel cooling pipeline are arranged in a coaxial dual-channel structure and are respectively arranged in the single-headed spiral grooves corresponding to the upper end face and the lower end face.

3. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of claim 2, wherein, It also includes a connecting channel, which extends along the axis of the magnetic ring body and is attached to the inner wall of the magnetic ring body. The connecting channel connects the upper microchannel cooling pipe and the lower microchannel cooling pipe.

4. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of claim 2, wherein, The slot spacing of the upper microchannel cooling pipe or the lower microchannel cooling pipe is equidistant from the center outwards.

5. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of claim 2, wherein, The spacing between the slots of the upper microchannel cooling pipe or the lower microchannel cooling pipe gradually increases from the center outwards.

6. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of claim 2, wherein, The single-headed spiral groove formed on the upper end face or the lower end face is connected to the inner wall surface and the outer wall surface of the magnetic ring body through the inner radial groove and the outer radial groove, respectively.

7. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of any of claims 1-6, wherein, The outer surface of the magnetic ring body is etched with ultraviolet laser to form the single-headed spiral groove, and the machining accuracy of the single-headed spiral groove is less than or equal to 0.01 mm.

8. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of any of claims 1-6, wherein, The microchannel cooling pipeline is made of EPDM material.

9. The integrated micro-channel liquid-cooled high voltage DC filter magnetic core of claim 1, wherein, It also includes a housing and a cover. The housing has an installation cavity that matches the magnetic ring body. One end of the housing is open and communicates with the installation cavity. The cover is placed over the open. The inlet and outlet of the microchannel cooling pipeline pass through the housing.

10. A filter, characterized in that, Including the integrated microchannel liquid-cooled high-voltage DC filter core as described in any one of claims 1 to 9.

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