Magnetic device and power conversion apparatus

Abstract

The application provides a magnetic device and a power conversion device, and relates to the technical field of electronics. The magnetic device comprises a magnetic core and a winding. The outer part of the magnetic core is entirely covered with an isolation layer. The magnetic core comprises a magnetic column. The winding is sleeved on the outer part of the magnetic column. The winding is partially covered with an insulation layer. The end part of the winding is exposed to the outer part of the insulation layer. The part of the winding covered with the insulation layer and the magnetic core can be located outside a receiving cavity to adapt to various environments outside the receiving cavity, which is conducive to improving the universality of the magnetic device. In addition, the heat of the winding can be transmitted to the external environment through the insulation layer only, which is conducive to shortening the heat dissipation path of the winding and improving the heat dissipation efficiency of the winding and the magnetic device.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a magnetic device and a power conversion device. Background Technology

[0002] In existing power conversion equipment, magnetic components are electrically connected to components within a housing cavity. In high-power applications, these magnetic components generate significant heat, necessitating their placement outside the housing cavity for heat dissipation. To adapt to various external environments, existing magnetic components house both the core and windings within a protective shell, which is then filled with potting compound for protection. However, this design requires the heat generated by the windings to pass through the potting compound and protective shell before reaching the external environment, resulting in a long heat dissipation path and low heat dissipation efficiency for the magnetic components. Utility Model Content

[0003] This application provides a magnetic device and a power conversion device, which aims to solve the problem of low heat dissipation efficiency of magnetic devices.

[0004] In a first aspect, embodiments of this application provide a magnetic device. The magnetic device includes a magnetic core and a winding. The entire exterior of the magnetic core is covered with an insulating layer. The magnetic core includes a magnetic post. The winding is sleeved on the exterior of the magnetic post. The winding portion is covered with an insulating layer. The ends of the winding are exposed outside the insulating layer. Both the insulating layer and the insulating layer are in contact with the external environment.

[0005] The magnetic device provided in this application embodiment can be applied in power conversion equipment, and the ends of the winding can be housed in the housing cavity. Since the entire exterior of the magnetic core is covered by an insulating layer, the magnetic core is protected by the insulating layer. Furthermore, since the winding portion is covered by an insulating layer, the ends of the winding are exposed outside the insulating layer, allowing the ends of the winding to be electrically connected to devices (such as power devices) in the housing cavity. The portion of the winding covered by the insulating layer is protected by the insulating layer. In this way, the magnetic core and the portion of the winding covered by the insulating layer can be located outside the housing cavity to adapt to various environments outside the housing cavity, which is beneficial for improving the versatility of the magnetic device. It can avoid damage caused by friction between the portion of the winding covered by the insulating layer and the magnetic core and foreign objects outside the housing cavity, thus improving the operational reliability of the magnetic device. In addition, the heat from the winding only needs to pass through the insulating layer to be transferred to the external environment, achieving heat dissipation of the winding. This helps to shorten the heat dissipation path of the winding, improve the heat dissipation efficiency of the winding and magnetic device, and increase the power density of the power conversion equipment. In this way, by improving the heat dissipation efficiency of the winding, the heat dissipation area of ​​the winding can be reduced, and the volume of the winding can be reduced, which is beneficial to reducing the materials used in the winding and reducing processing costs. In addition, this design only requires covering the outside of the winding with an insulating layer. On the one hand, the structure is simple and easy to process, which is beneficial to improving processing efficiency and the consistency of magnetic device processing and reducing processing costs. On the other hand, the volume of the magnetic device will not change significantly, which can avoid the introduction of a protective shell and is conducive to the miniaturization design of magnetic devices.

[0006] In one possible implementation, the end of the winding is located on one side of the magnetic core along the axial direction of the magnetic column.

[0007] Airflow outside the receiving cavity can transfer heat from the winding to the external environment through the portion of the winding sleeved on the outside of the magnetic post, thus achieving heat dissipation for the winding and magnetic components. Since the end of the winding needs to pass through the cavity wall to be housed within the receiving cavity, this design ensures that the portion of the winding sleeved on the outside of the magnetic post faces the receiving cavity on the axial side of the magnetic post. This avoids the portion of the winding sleeved on the outside of the magnetic post being blocked by the cavity wall in the circumferential direction of the magnetic post, which helps increase the contact area between the winding and the airflow outside the receiving cavity, thereby improving the heat dissipation efficiency for the winding and magnetic components.

[0008] In one possible implementation, the projection of the end of the winding along the axial direction of the magnetic post is located inside the projection of the magnetic core along the axial direction of the magnetic post.

[0009] This is beneficial for improving the space utilization of the windings, improving the space utilization of magnetic devices, and facilitating the miniaturization design of magnetic devices.

[0010] In one possible implementation, the end of the winding extends along the axial direction of the magnetic post.

[0011] This ensures that the end of the winding can pass through the cavity wall along the axial direction of the magnetic post and be housed within the cavity. On the one hand, this avoids the portion of the winding sleeved outside the magnetic post being blocked by the cavity wall in the circumferential direction of the magnetic post, which is beneficial to improving the heat dissipation efficiency of the winding and magnetic devices. On the other hand, the simple end structure of the winding reduces the difficulty of the winding end passing through the cavity wall, avoids setting excessively large mounting holes (for the winding end to pass through) on the cavity wall, improves the strength of the cavity wall, and enhances the structural stability and reliability of the power conversion equipment.

[0012] In one possible implementation, the winding includes a multi-turn coil arranged sequentially along the axial direction of the magnetic post, with adjacent turns spaced apart.

[0013] In this way, the airflow outside the housing cavity can flow through the gap between adjacent turns of the coil, which helps to increase the contact area between the winding and the airflow outside the housing cavity, and improves the heat dissipation efficiency of the winding and magnetic components. In addition, while keeping the axial dimension of the winding unchanged, it helps to reduce the material cost of the winding and the processing cost of the winding and magnetic components.

[0014] In one possible implementation, the magnetic core further includes a fixing part, which is disposed on one side of the magnetic column along the axial direction. The area of ​​the fixing part projected along the axial direction of the magnetic column is larger than the area of ​​the magnetic column projected along the axial direction of the magnetic column. The magnetic device also includes an insulating plate, which is sleeved on the outside of the magnetic column and located between the fixing part and the winding.

[0015] In this way, the fixing part can limit the winding, preventing it from detaching from the magnetic post, which helps improve the structural stability and reliability of the magnetic device. The design of the insulating plate can achieve insulation between the fixing part and the part of the winding sleeved on the outside of the magnetic post, which helps improve the withstand voltage performance of the winding and improves the safety of the magnetic device in use.

[0016] In one possible implementation, the magnetic device further includes a first fixing member, which is stacked on one side of the magnetic core along the axial direction of the magnetic column. The first fixing member is provided with a snap-fit ​​hole, and a winding portion is snapped into the snap-fit ​​hole. At least part of the end of the winding is located on the side of the first fixing member facing away from the magnetic core.

[0017] In this way, the winding can be limited by the snap-fit ​​hole, preventing the winding from rotating axially around the magnetic post, which helps improve the structural stability and reliability of the magnetic device. Furthermore, the design of the first fixing member being stacked on one side of the magnetic core along the axial direction of the magnetic post avoids the first fixing member occupying the space around the magnetic post where the winding is sleeved, thus increasing the contact area between the winding and the airflow outside the housing cavity and improving the heat dissipation efficiency of the winding and the magnetic device. Additionally, since at least part of the winding's end is located on the side of the first fixing member facing away from the magnetic core, the first fixing member prevents the magnetic core from contacting the cavity wall, avoiding friction damage and extending the service life of the magnetic core and the magnetic device.

[0018] In one possible implementation, the magnetic device further includes a second fixing member and a connector. The second fixing member is stacked on the side of the magnetic core facing away from the first fixing member, and the connector is disposed between the first fixing member and the second fixing member. The magnetic core is clamped between the first fixing member and the second fixing member.

[0019] In this way, by controlling the dimensions of the connector in the axial direction of the magnetic column, the magnetic core can be clamped between the first fixing member and the second fixing member, thus achieving a fixed connection between the magnetic core and the first fixing member. Not only is the connection between the magnetic core and the first fixing member detachable, which facilitates the maintenance or replacement of the first fixing member and helps extend the working life of the magnetic device, but it also facilitates assembly and helps reduce the processing cost of the magnetic device.

[0020] In one possible implementation, there are multiple connectors, which are spaced apart around the magnetic core.

[0021] In this way, the airflow outside the housing cavity can flow through the gap between two adjacent connectors and pass through the part of the winding sleeved outside the magnetic column, which helps to increase the contact area between the winding and the airflow outside the housing cavity and improve the heat dissipation efficiency of the winding and magnetic devices.

[0022] In one possible implementation, the magnetic device further includes a sealing ring disposed on the side of the first fixing member facing away from the magnetic core, the sealing ring wrapping around the end of the assembly axially around the magnetic post.

[0023] In this way, when the end of the winding is housed in the receiving cavity, part of the winding passes through the cavity wall of the receiving cavity, and the sealing ring can abut against the cavity wall of the receiving cavity. The sealing ring and the first fixing member can achieve the sealing of the receiving cavity, which is beneficial to improving the safety of the device (e.g., power device) in the receiving cavity and extending the working life of the device (e.g., power device) in the receiving cavity.

[0024] In one possible implementation, the first fixing member has a groove on the side facing away from the magnetic core, and the sealing ring is received in the groove.

[0025] This approach improves the space utilization of the sealing ring and the first fixing component, reduces the axial dimensions of the magnetic device on the magnetic column, and facilitates the miniaturization and lightweight design of the magnetic device.

[0026] In one possible implementation, there are multiple magnetic pillars and multiple windings. In the radial direction of the magnetic pillars, multiple magnetic pillars are arranged sequentially at intervals. Each winding is sleeved on the outside of a magnetic pillar. In the direction perpendicular to the first plane, in a winding, the end of one winding is opposite to the end of another winding and is arranged at intervals. The axes of the multiple magnetic pillars are located in the first plane.

[0027] In a direction perpendicular to the first plane, the design where the ends of one winding are opposite and spaced apart from the ends of another winding in a winding helps to reduce the spacing between two adjacent magnetic pillars, improves the space utilization of magnetic devices, and facilitates the miniaturization of magnetic devices. Furthermore, it ensures uniform stress on the windings, which helps to improve the structural stability and reliability of the windings and magnetic devices.

[0028] Secondly, embodiments of this application also provide a power conversion device. The power conversion device includes a housing and the magnetic device described in any of the first aspects. The housing includes a receiving cavity, the magnetic device portion is located outside the receiving cavity, and the end of the winding is received within the receiving cavity.

[0029] In one possible implementation, the power conversion device includes a power device housed in a housing cavity and electrically connected to the end of a winding.

[0030] In one possible implementation, the power conversion device further includes a fan, the housing includes an air duct, the air duct and the receiving cavity are spaced apart, and the fan and magnetic components are partially housed in the air duct. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0032] Figure 1 This is a three-dimensional structural schematic diagram of a power conversion device provided in an embodiment of this application;

[0033] Figure 2 yes Figure 1 A three-dimensional structural schematic diagram of the power conversion device shown (cover plate and circuit board omitted);

[0034] Figure 3 yes Figure 1 A three-dimensional structural diagram of the power conversion device shown, cut along line AA;

[0035] Figure 4 yes Figure 3 A partial structural schematic diagram of the power conversion device shown from another angle;

[0036] Figure 5 yes Figure 3 A three-dimensional structural diagram of the magnetic components of the power conversion device shown from another angle;

[0037] Figure 6 yes Figure 5 The diagram shows a cross-section of the magnetic device along line BB.

[0038] Figure 7 yes Figure 5 The diagram shown is an exploded 3D structure of the magnetic device omitting the isolation layer.

[0039] Figure 8 yes Figure 7 The diagram shows a three-dimensional structure of the magnetic device with the insulation layer omitted from the winding.

[0040] Figure 9 yes Figure 5 The diagram shows a cross-section of the magnetic device along the CC line.

[0041] Figure 10 This is a schematic diagram of another magnetic device provided in the embodiments of this application. Detailed Implementation

[0042] The embodiments of this application are described below with reference to the accompanying drawings.

[0043] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 This is a three-dimensional structural diagram of a power conversion device 1000 provided in an embodiment of this application. Figure 2 yes Figure 1 A three-dimensional structural diagram of the power conversion device 1000 shown (excluding the cover plate 106 and circuit board 400). Figure 3 yes Figure 1 The diagram shows a three-dimensional structure of the power conversion device 1000 cut along line AA. Figure 4 yes Figure 3 The diagram shows a partial structural view of the power conversion device 1000 from another angle.

[0044] like Figure 1As shown, exemplarily, the power conversion device 1000 is a photovoltaic inverter. In other embodiments, the power conversion device 1000 may also be an electronic device for power conversion, such as a rectifier, transformer, converter, or other inverter. The power conversion device 1000 is used to convert the direct current (DC) output from the photovoltaic modules into alternating current (AC) and supply it to the power grid or a load. The load may be electronic devices that use AC power, including but not limited to motors, fans, or air conditioners. In other embodiments, the power conversion device 1000 may also be a charging pile. The power conversion device 1000 can convert AC power output from the power grid or AC power source into DC power to supply a tram. In other embodiments, the power conversion device 1000 may also be applied to an electric drive controller. For example, the power conversion device 1000 can convert DC power output from a battery into AC power to supply a motor. In still other embodiments, the power conversion device 1000 may also be applied to a data center. The power conversion device 1000 can convert AC power output from a power supply into stable DC power to supply servers.

[0045] like Figure 2 , Figure 3 and Figure 4 As shown, the power conversion device 1000 may include a housing 100, a heat sink 200, a magnetic device 300, a circuit board 400, a power device 500, and a fan 600. The housing 100 includes a receiving cavity 101, an air duct 102, and a connecting hole 103. The air duct 102 is spaced apart from the receiving cavity 101; wherein the air duct 102 surrounds at least a portion of the receiving cavity 101, and the connecting hole 103 communicates with both the air duct 102 and the receiving cavity 101. The air duct 102 includes an air inlet 1021 and an air outlet 1022, which are spaced apart.

[0046] Specifically, the air duct 102 may include a first section 1023 and a second section 1024. In the Y-axis direction, the first section 1023 is located on one side of the receiving cavity 101, and a partition plate 104 is provided between the first section 1023 and the receiving cavity 101. In the Z-axis direction, the second section 1024 is located on one side of the receiving cavity 101 and communicates with the first section 1023. A connecting hole 103 penetrates the partition plate 104 along the X-axis direction and communicates with the receiving cavity 101 and the first section 1023. An air inlet 1021 may penetrate the housing 100 along the Y-axis direction and communicate with the first section 1023. Furthermore, in the Y-axis direction, the air inlet 1021 may be located on the side of the first section 1023 facing away from the receiving cavity 101. An air outlet 1022 may penetrate the housing 100 along the Y-axis direction and communicate with the second section 1024. In the Y-axis direction, the air outlet 1022 may be located on the side of the second section 1024 facing away from the air inlet 1021. In some other embodiments, the air inlet 1021 may also penetrate the housing 100 along the X-axis or Z-axis and communicate with the first segment 1023, and the air outlet 1022 may also penetrate the housing 100 along the X-axis or Z-axis and communicate with the second segment 1024. The housing 100 may include a receiving shell 105 and a cover plate 106. In the Y-axis direction, the cover plate 106 is disposed on one side of the receiving shell 105, and the receiving shell 105 and the cover plate 106 together form a receiving cavity 101. An air duct 102 is disposed within the receiving shell 105.

[0047] The heat sink 200 is housed in the air duct 102 and covers the connecting hole 103 to seal the receiving cavity 101. The heat sink 200 is housed in the first section 1023 and is fixedly stacked on the side of the partition plate 104 facing away from the receiving cavity 101. The heat sink 200 can be a heat-conducting device including, but not limited to, an air-cooled heat sink or a liquid-cooled heat sink.

[0048] The magnetic device 300 is partially located outside the receiving cavity 101 and partially located inside the receiving cavity 101. Specifically, the cavity wall of the receiving cavity 101 includes a partition cavity wall 1011, which separates the receiving cavity 101 from the second section 1024 of the air duct 102. The housing 100 is provided with a mounting hole 107, which penetrates the partition cavity wall 1011 along the Z-axis and communicates with the receiving cavity 101 and the second section 1024. The magnetic device 300 is partially located in the second section 1024 (i.e., the air duct 102) and partially passes through the mounting hole 107 and is located in the receiving cavity 101. That is, a portion of the magnetic device 300 is received in the air duct 102. Exemplarily, there are multiple mounting holes 107. The multiple mounting holes 107 are spaced apart. In some other embodiments, there may be only one mounting hole 107. The heat sink 200 and the magnetic device 300 are both located between the air inlet 1021 and the air outlet 1022. Specifically, the magnetic device 300 can be located on the side of the heat sink 200 away from the air inlet 1021. For example, the magnetic device 300 can be an inductor, specifically a power inductor. There can be multiple magnetic devices 300. Multiple magnetic devices 300 are arranged sequentially in the X-axis direction. In some other embodiments, the number of magnetic devices 300 can be one.

[0049] Both the circuit board 400 and the power device 500 are housed within the receiving cavity 101. The power device 500 is disposed on one side of the circuit board 400. Specifically, in the Y-axis direction, the power device 500 is disposed on the side of the circuit board 400 facing the heat sink 200. The power device 500 is electrically connected to the magnetic device 300. Specifically, an adapter 700 is provided between the power device 500 and the magnetic device 300, and the adapter 700 is housed within the receiving cavity 101. The power device 500 is electrically connected to the magnetic device 300 via the adapter 700. The adapter 700 may be, but is not limited to, a metal sheet, a cable, or other conductive device. In some other embodiments, the power device 500 may also make contact with and be electrically connected to the portion of the magnetic device 300 housed within the receiving cavity 101. The magnetic device 300 may also be electrically connected to the power device 500 via the circuit board 400. For example, the power device 500 can be a power conversion device including but not limited to IGBT (Insulated Gate Bipolar Transistor) chip, FRD (Fast Recovery Diode) chip, or MOSFET (Metal Oxide Semiconductor Field-Effect Transistor) chip.

[0050] The direct current (DC) output from the photovoltaic modules can be transmitted to the power device 500 via the circuit board 400. The power device 500 converts the DC to alternating current (AC). A magnetic device 300 works in conjunction with the power device 500 to perform power factor calibration on the AC. The AC, after power factor calibration, is then supplied to the power grid or load. Power factor calibration ensures that the phase of the AC voltage is the same as the phase of the current, and that the frequency of the AC voltage is the same as the frequency of the current. This helps reduce AC transmission losses, improves AC transmission efficiency, and enhances the power supply capacity of the power conversion device 1000 to the power grid or load.

[0051] In some other embodiments, the magnetic device 300 may also be a filter inductor. The power device 500 may also be a DC / AC (Direct Current / Alternating Current) module. The power conversion device 1000 may also include a capacitor, which may be housed in the air duct 102. The power device 500 can convert the DC power output from the photovoltaic module into AC power. The magnetic device 300 works in conjunction with the capacitor to filter the AC power. The filtered AC power is then supplied to the power grid or a load. In other embodiments, the magnetic device 300 may also be a transformer. The magnetic device 300 boosts the DC power output from the photovoltaic module. The power device 500 converts the boosted DC power into AC power to supply the power grid or a load.

[0052] The fan 600 is housed within the air duct 102. Specifically, the fan 600 is housed within the first section 1023 and located on the side of the heat sink 200 near the air inlet 1021. The heat generated by the power device 500 can be transferred to the heat sink 200. The fan 600 can drive external airflow (i.e., airflow outside the housing cavity 101) from the air inlet 1021 into the air duct 102, then through the heat sink 200 and the magnetic device 300, and out through the air outlet 1022, thereby dissipating heat from the power device 500 and the magnetic device 300. In some other embodiments, the fan 600 may also be located between the heat sink 200 and the magnetic device 300.

[0053] Please see Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 and combined Figure 3 and Figure 4 , Figure 5 yes Figure 3 A three-dimensional structural diagram of the magnetic device 300 of the power conversion device 1000 shown from another angle. Figure 6 yes Figure 5 The diagram shows a cross-section of the magnetic device 300 along line BB. Figure 7 yes Figure 5 The diagram shown is an exploded view of the three-dimensional structure of the magnetic device 300, omitting the isolation layer 30. Figure 8 yes Figure 7 The diagram shows a three-dimensional structure of the winding 20 of the magnetic device 300, omitting the insulating layer 40. Figure 9 yes Figure 5 The diagram shows a cross-section of the magnetic device 300 along the CC line.

[0054] like Figure 5 , Figure 6 and Figure 7 As shown, the magnetic device 300 may include a magnetic core 10 and a winding 20. The entire exterior of the magnetic core 10 is covered by an insulating layer 30. The magnetic core 10 may include a magnetic pillar 11 and a fixing part 12, with the magnetic pillar 11 extending along the Z-axis direction. The insulating layer 30 covers the entire magnetic pillar 11 and the fixing part 12. In this embodiment, the axial direction of the magnetic pillar 11 is the Z-axis direction shown in the figure. The radial direction of the magnetic pillar 11 may be the X-axis direction, and the direction perpendicular to both the axial and radial directions of the magnetic pillar 11 is the Y-axis direction shown in the figure. Exemplarily, the shape of the projection of the magnetic pillar 11 along the Z-axis direction may be, but is not limited to, a circle, rectangle, ellipse, or racetrack shape. The fixing part 12 is disposed on one side of the magnetic pillar 11 along the Z-axis direction (i.e., the axial direction of the magnetic pillar 11). The area of ​​the projection of the fixing part 12 along the Z-axis direction (i.e., the axial direction of the magnetic pillar 11) is larger than the area of ​​the projection of the magnetic pillar 11 along the Z-axis direction (i.e., the axial direction of the magnetic pillar 11). The fixing part 12 is fixedly stacked with the magnetic post 11 by means including but not limited to welding or adhesive bonding. Specifically, there are multiple fixing parts 12, including a first fixing part 12a and a second fixing part 12b. In the Z-axis direction, the first fixing part 12a and the second fixing part 12b are respectively disposed on both sides of the magnetic post 11. The insulating layer 30 can be made of materials including but not limited to paint (e.g., red paint), PEEK (polyetheretherketone), plastic, or other insulating materials.

[0055] The winding 20 is sleeved on the outside of the magnetic post 11, and part of the winding 20 is covered with an insulating layer 40, with the ends of the winding 20 exposed outside the insulating layer 40. The winding 20 is formed by winding with wire. The wire can be made of conductive materials including but not limited to copper, aluminum, or iron. The wire can be, but not limited to, round wire, flat wire, or Litz wire. The insulating layer 40 can be made of, but not limited to, PEEK, plastic, rubber, or other insulating materials. The insulating layer 40 can be, but not limited to, a coating, insulating tape, or non-woven fabric. The outside of the insulating layer 40 may also be covered with red paint to protect the winding 20, which helps to improve the structural stability and reliability of the magnetic device 300.

[0056] like Figure 6 , Figure 7 and Figure 8 As shown, the winding 20 has two ends. For ease of description, the two ends of the winding 20 are defined as the first end 21 and the second end 22. For example, the winding 20 may include the first end 21, the second end 22, the winding body 23, the first connecting portion 24, and the second connecting portion 25. The winding body 23 is connected to the first end 21 via the first connecting portion 24 and to the second end 22 via the second connecting portion 25. The insulating layer 40 completely covers the winding body 23, the first connecting portion 24, and the second connecting portion 25. Both the first end 21 and the second end 22 are exposed outside the insulating layer 40. The winding body 23 is sleeved outside the magnetic post 11 and located between the first fixing portion 12a and the second fixing portion 12b. Thus, the fixing portion 12 can limit the winding body 23 (i.e., the winding 20), preventing it from detaching from the magnetic post 11, which helps improve the structural stability and reliability of the magnetic device 300.

[0057] like Figure 3 , Figure 4 and Figure 6 As shown, the magnetic core 10 and part of the winding 20 are located outside the receiving cavity 101 and housed in the second section 1024 of the air duct 102. The end of the winding 20 is housed in the receiving cavity 101 and electrically connected to the power device 500. It can be understood that the power device 500 is housed in the receiving cavity 101 and electrically connected to the end of the winding 20. Specifically, the winding body 23 is located outside the receiving cavity 101 and housed in the second section 1024 of the air duct 102. The first connecting portion 24 and the second connecting portion 25 are respectively disposed in a mounting hole 107. Both the first connecting portion 24 and the second connecting portion 25 are partially housed in the receiving cavity 101 and also partially housed in the second section 1024 of the air duct 102. The first end 21 and the second end 22 of the winding 20 are entirely housed in the receiving cavity 101 and are electrically connected to the power device 500 via an adapter 700. Both the isolation layer 30 and the insulation layer 40 are in contact with the external environment. The ends of the winding 20 and the adapter 700 are fixedly stacked using fasteners. The first end 21 is fixedly stacked with one adapter 700, and the second end 22 is fixedly stacked with another adapter 700. External airflow (i.e., airflow outside the receiving cavity 101) flows into the air duct 102 from the air inlet 1021, and then flows out from the air outlet 1022 through the winding 20. The airflow flowing through the winding 20 can transfer the heat generated by the winding 20 to the external environment, thereby achieving heat dissipation for the winding 20 and the magnetic device 300.

[0058] The magnetic device 300 provided in this embodiment can be applied in a power conversion device 1000. The ends of the winding 20 (i.e., the first end 21 and the second end 22) can be housed in the receiving cavity 101 of the housing 100. Since the entire exterior of the magnetic core 10 is covered by the isolation layer 30, the magnetic core 10 can be protected by the isolation layer 30. Furthermore, since the winding 20 is partially covered by the insulating layer 40, the ends of the winding 20 (i.e., the first end 21 and the second end 22) are exposed outside the insulating layer 40. The ends of the winding 20 (i.e., the first end 21 and the second end 22) can be electrically connected to the device (e.g., the power device 500) in the receiving cavity 101. The portion of the winding 20 covered by the insulating layer 40 (including the winding body 23, the first connecting portion 24, and the second connecting portion 25) can be protected by the insulating layer 40. In this way, the portion of the winding 20 covered with the insulating layer 40 (including the winding body 23, the first connecting portion 24, and the second connecting portion 25) and the magnetic core 10 can be located outside the receiving cavity 101 to adapt to various environments outside the receiving cavity 101. This is beneficial to improving the versatility of the magnetic device 300 and can prevent damage caused by friction between the portion of the winding 20 covered with the insulating layer 40 (including the winding body 23, the first connecting portion 24, and the second connecting portion 25) and the magnetic core 10 and foreign objects outside the receiving cavity 101. This is beneficial to improving the operational reliability of the magnetic device 300. In addition, the heat of the winding 20 only needs to be transferred to the external environment through the insulating layer 40 to achieve heat dissipation of the winding 20. This is beneficial to shortening the heat dissipation path of the winding 20, improving the heat dissipation efficiency of the winding 20 and the magnetic device 300, and improving the power density of the power conversion device 1000. In this way, by improving the heat dissipation efficiency of the winding 20, the heat dissipation area of ​​the winding 20 can be reduced, and the volume of the winding 20 can be reduced, which is beneficial to reducing the materials used in the manufacture of the winding 20 and reducing processing costs. In addition, this design only requires covering the outside of the winding 20 with an insulating layer 40. On the one hand, the structure is simple and easy to process, which is beneficial to improving processing efficiency and the processing consistency of the magnetic device 300, and reducing processing costs. On the other hand, the volume of the magnetic device 300 will not change significantly, which can avoid the introduction of a protective shell and is conducive to the miniaturization design of the magnetic device 300.

[0059] like Figure 4 , Figure 6 and Figure 8As shown, in some embodiments, the ends of the winding 20 are located on one side of the magnetic core 10 in the Z-axis direction (i.e., the axial direction of the magnetic column 11). Specifically, in the Z-axis direction, the first end 21 and the second end 22 are located on one side of the magnetic core 10. The ends of the winding 20 (the first end 21 and the second end 22) are located on the side of the first fixing part 12a (i.e., the fixing part 12) facing away from the magnetic column 11. External airflow (i.e., airflow outside the receiving cavity 101) can transfer the heat of the winding 20 to the external environment through the winding body 23 (i.e., the part of the winding 20 sleeved on the outside of the magnetic column 11), thereby achieving heat dissipation for the winding 20 and the magnetic device 300. Since the ends of the winding 20 (first end 21 and second end 22) need to pass through the partition wall 1011 (i.e., the cavity wall of the receiving cavity 101) to be received in the receiving cavity 101, this design ensures that one side of the winding body 23 (i.e., the part of the winding 20 sleeved on the outside of the magnetic post 11) in the Z-axis direction (i.e., the axial direction of the magnetic post 11) can face the receiving cavity 101. This avoids the space of the winding body 23 (i.e., the part of the winding 20 sleeved on the outside of the magnetic post 11) in the circumferential direction of the magnetic post 11 being blocked by the partition wall 1011 (i.e., the cavity wall of the receiving cavity 101), which is beneficial to increasing the contact area between the winding 20 and the airflow outside the receiving cavity 101, and is beneficial to improving the heat dissipation efficiency of the winding 20 and the magnetic device 300. In some other embodiments, in the Z-axis direction, the first end 21 and the second end 22 may also be located on both sides of the magnetic core 10, and the first end 21 and the second end 22 can be arranged according to requirements.

[0060] In some embodiments, the projection of the end of the winding 20 along the Z-axis (i.e., the axial direction of the magnetic column 11) is located inside the projection of the magnetic core 10 along the Z-axis (i.e., the axial direction of the magnetic column 11). Specifically, the projection of the ends of the winding 20 (first end 21 and second end 22) along the Z-axis is located inside the projection of the fixing portion 12 along the Z-axis. This is beneficial for improving the space utilization of the winding 20, improving the space utilization of the magnetic device 300, and facilitating the miniaturization design of the magnetic device 300.

[0061] In some embodiments, the end of the winding 20 extends along the Z-axis direction (i.e., the axial direction of the magnetic post 11). This ensures that the end of the winding 20 can pass through the partition wall 1011 (i.e., the cavity wall of the receiving cavity 101) along the Z-axis direction (i.e., the axial direction of the magnetic column 11) and be received in the receiving cavity 101. On the one hand, it can prevent the winding body 23 (i.e., the part of the winding 20 sleeved on the outside of the magnetic column 11) from being blocked by the partition wall 1011 (i.e., the cavity wall of the receiving cavity 101) in the circumferential direction of the magnetic column 11, which is beneficial to improving the heat dissipation efficiency of the winding 20 and the magnetic device 300. Moreover, the end structure of the winding 20 is simple, which helps to reduce the difficulty of the end of the winding 20 passing through the partition wall 1011 (i.e., the cavity wall of the receiving cavity 101), and avoids setting an excessively large mounting hole 107 (for the end of the winding 20 to pass through) on the partition wall 1011 (i.e., the cavity wall of the receiving cavity 101), which is beneficial to improving the strength of the partition wall 1011 (i.e., the cavity wall of the receiving cavity 101), and is beneficial to improving the structural stability and reliability of the power conversion device 1000.

[0062] exist Figure 4 , Figure 6 and Figure 8 In the illustrated embodiment, the winding body 23 includes a first fixed end 231 and a second fixed end 232. In the Z-axis direction, the first fixed end 231 and the second fixed end 232 are stacked and spaced apart. Both the first fixed end 231 and the second fixed end 232 extend along the Y-axis direction. In the Y-axis direction, the first fixed end 231 and the second fixed end 232 are positioned opposite each other. Specifically, in the Z-axis direction, the first fixed end 231 is closer to the first fixed portion 12a, and the second fixed end 232 is closer to the second fixed portion 12b.

[0063] The first connecting portion 24 includes a first connecting segment 241, a second connecting segment 242, and a third connecting segment 243. The first connecting segment 241 is fixedly connected to the first fixed end 231 on the side facing away from the second fixed end 232 in the Z-axis direction and extends along the Z-axis. The second connecting segment 242 is fixedly connected to the first connecting segment 241 on the side facing towards the winding body 23 in the Y-axis direction and extends along the Y-axis. The third connecting segment 243 is fixedly connected to the second connecting segment 242 on the side facing away from the winding body 23 in the Z-axis direction, extends along the Z-axis, and is fixedly connected to the first end portion 21. The first end portion 21 extends along the Z-axis. Specifically, in the Y-axis direction, the first connecting segment 241 is located on one side of the magnetic core 10. In the Z-axis direction, both the second connecting segment 242 and the third connecting segment 243 are located on one side of the magnetic core 10. Specifically, both the second connecting segment 242 and the third connecting segment 243 are located on the side of the first fixed portion 12a facing away from the magnetic post 11. The projection of the third connecting segment 243 along the Z-axis lies within the projection of the magnetic core 10 along the Z-axis. This design of the first connecting part 24, which is adapted to the shape of the magnetic core 10, avoids the first connecting part 24 passing through the magnetic core 10, thus improving the structural reliability and stability of the magnetic core 10.

[0064] The second connecting portion 25 includes a fourth connecting segment 251, a fifth connecting segment 252, and a sixth connecting segment 253. The fourth connecting segment 251 is fixedly connected to the second fixed end 232 on the side facing the first fixed end 231 in the Z-axis direction and extends along the Z-axis. The fifth connecting segment 252 is fixedly connected to the fourth connecting segment 251 on the side of the first connecting portion 24 in the Y-axis direction and extends along the Y-axis. The sixth connecting segment 253 is fixedly connected to the fifth connecting segment 252 on the side facing away from the winding body 23 in the Z-axis direction, extends along the Z-axis, and is fixedly connected to the second end portion 22. The second end portion 22 extends along the Z-axis. In the Y-axis direction, the first end portion 21 and the second end portion 22 are opposite to each other and spaced apart. In the Y-axis direction, the fourth connecting segment 251 is located on the side of the magnetic core 10 facing away from the first connecting segment 241. In the Z-axis direction, both the fifth connecting segment 252 and the sixth connecting segment 253 are located on one side of the magnetic core 10. Specifically, both the fifth connecting segment 252 and the sixth connecting segment 253 are located on the side of the first fixing part 12a facing away from the magnetic post 11. The projection of the fifth connecting segment 252 along the Z-axis lies within the projection of the magnetic core 10 along the Z-axis. This design of the second connecting part 25, adapted to the shape of the magnetic core 10, avoids the second connecting part 25 passing through the magnetic core 10, thus improving the structural reliability and stability of the magnetic core 10.

[0065] In some embodiments, the winding 20 includes a multi-turn coil 26 sequentially arranged in the Z-axis direction (i.e., the axial direction of the magnetic post 11). Specifically, the winding body 23 includes a multi-turn coil 26 sequentially arranged in the Z-axis direction, and the first fixed end 231 is fixedly connected to the second fixed end 232 through the multi-turn coil 26. Each coil 26 is sleeved on the outside of the magnetic post 11. Adjacent coils 26 are spaced apart. In this way, the airflow outside the receiving cavity 101 can flow through the gap between adjacent coils 26, which helps to increase the contact area between the winding 20 and the airflow outside the receiving cavity 101, and helps to improve the heat dissipation efficiency of the winding 20 and the magnetic device 300. In addition, while keeping the dimensions of the winding 20 in the Z-axis direction (i.e., the axial direction of the magnetic post 11) unchanged, it helps to reduce the material cost of the winding 20 and the processing cost of the winding 20 and the magnetic device 300.

[0066] like Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments, there are multiple magnetic pillars 11 and multiple windings 20. Multiple magnetic pillars 11 are arranged sequentially at intervals in the X-axis direction (i.e., the radial direction of the magnetic pillars 11). Each winding 20 is sleeved on the outside of one magnetic pillar 11. In a direction perpendicular to the first plane, in one winding 20, a first end 21 (i.e., the end of one winding 20) and a second end 22 (i.e., the end of another winding 20) are opposite to each other and spaced apart. The axes of the multiple magnetic pillars 11 lie within the first plane. It can be understood that the first plane is a plane parallel to the XZ plane. The direction perpendicular to the first plane is the Y-axis direction. In the Y-axis direction (i.e., the direction perpendicular to the first plane), the design in which the first end 21 (i.e., the end of one winding 20) and the second end 22 (i.e., the end of another winding 20) are positioned opposite each other and spaced apart is beneficial for reducing the spacing between two adjacent magnetic pillars 11 (i.e., the distance between two adjacent magnetic pillars 11 in the X-axis direction), improving the space utilization of the magnetic device 300, and facilitating the miniaturization design of the magnetic device 300. Furthermore, it ensures uniform force distribution on the winding 20, which is beneficial for improving the structural stability and reliability of the winding 20 and the magnetic device 300.

[0067] exist Figure 4 , Figure 5 and Figure 7In the illustrated embodiment, the plurality of magnetic pillars 11 include a first magnetic pillar 11a and a second magnetic pillar 11b. In the X-axis direction, the first magnetic pillar 11a and the second magnetic pillar 11b are spaced apart. Both the first magnetic pillar 11a and the second magnetic pillar 11b are provided with a first fixing portion 12a and a second fixing portion 12b, as detailed above. In the X-axis direction, the first fixing portion 12a of the first magnetic pillar 11a and the first fixing portion 12a of the second magnetic pillar 11b are fixedly connected. Exemplarily, the first fixing portion 12a of the first magnetic pillar 11a and the first fixing portion 12a of the second magnetic pillar 11b can be integrally formed. This is beneficial for improving the structural stability and reliability of the magnetic core 10 and the magnetic device 300. In other embodiments, the first fixing portion 12a of the first magnetic pillar 11a and the first fixing portion 12a of the second magnetic pillar 11b can also be fixedly connected by means including but not limited to welding or adhesive bonding.

[0068] In the X-axis direction, the second fixing part 12b disposed on the first magnetic post 11a and the second fixing part 12b disposed on the second magnetic post 11b are spaced apart. A baffle 13 is provided between the first magnetic post 11a and the second magnetic post 11b. In the X-axis direction, the second fixing part 12b disposed on the first magnetic post 11a, the baffle 13, and the second fixing part 12b disposed on the second magnetic post 11b are sequentially and fixedly connected. In the Z-axis direction, the baffle 13 is fixedly connected to the side of the first fixing part 12a disposed on the first magnetic post 11a facing the first magnetic post 11a, and is also fixedly connected to the side of the first fixing part 12a disposed on the second magnetic post 11b facing the second magnetic post 11b. An isolation layer 30 covers the entire baffle 13. In some other embodiments, in the X-axis direction, the second fixing part 12b disposed on the first magnetic post 11a and the second fixing part 12b disposed on the second magnetic post 11b can also be fixedly connected, and the baffle 13 can be fixedly connected between the first fixing part 12a disposed on the first magnetic post 11a and the second fixing part 12b disposed on the first magnetic post 11a.

[0069] Multiple windings 20 include a first winding 20a and a second winding 20b. The first winding 20a is sleeved on a first magnetic post 11a, and the second winding 20b is sleeved on a second magnetic post 11b. In the X-axis direction, the first winding 20a and the second winding 20b are spaced apart. In the X-axis direction, a baffle 13 is located between the first winding 20a and the second winding 20b. Specifically, in the X-axis direction, the baffle 13 is located between the winding body 23 of the first winding 20a and the winding body 23 of the second winding 20b. Thus, the baffle 13 isolates the first winding 20a and the second winding 20b to improve the operational safety of the magnetic device 300. In the first winding 20a, in the Y-axis direction, the first end 21 and the second end 22 are opposite to each other and spaced apart. In the second winding 20b, in the Y-axis direction, the first end 21 and the second end 22 are opposite to each other and spaced apart. For details, please refer to the relevant description above; further elaboration is unnecessary. Furthermore, in one winding 20 (first winding 20a or second winding 20b), the projection of the first end 21 along the Y-axis direction overlaps with the projection of the second end 22 along the Y-axis direction. This improves the space utilization of the winding 20 and facilitates the miniaturization design of the magnetic device 300.

[0070] In other embodiments, the number of magnetic posts 11 and the number of windings 20 may be one, three, or more. It is understood that, depending on the number of windings 20, the magnetic device 300 can be a multi-phase device or a single-phase device. Specifically, when the number of windings 20 is one, the magnetic device 300 is a single-phase device. When the number of windings 20 is multiple, the magnetic device 300 is a multi-phase device. For example, when the number of windings 20 is two, the magnetic device 300 is a two-phase device.

[0071] like Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the magnetic device 300 further includes an insulating plate 50, which is sleeved on the outside of the magnetic post 11 and located between the fixing part 12 and the winding 20. Specifically, the insulating plate 50 abuts against the fixing part 12 and the winding body 23. The insulating plate 50 abuts against the insulating layer 30. The design of the insulating plate 50 can achieve insulation between the fixing part 12 and the winding body 23 (i.e., the part of the winding 20 sleeved on the outside of the magnetic post 11), which is beneficial to improving the withstand voltage performance of the winding 20 and improving the safety of the magnetic device 300. For example, the insulating plate 50 can be made of insulating materials including but not limited to epoxy resin, plastic, or rubber.

[0072] exist Figure 5 , Figure 6 and Figure 7In the illustrated embodiment, the shape of the projection of the insulating plate 50 along the Z-axis can be, but is not limited to, a rectangle, a circle, a square, or other irregular shapes. The insulating plate 50 is sleeved on the outside of the first magnetic post 11a, the second magnetic post 11b, and the baffle 13. Specifically, the insulating plate 50 is provided with a first through hole 51 and a second through hole 52. Both the first through hole 51 and the second through hole 52 penetrate the insulating plate 50 along the Z-axis. There are multiple first through holes 51, specifically two. In the X-axis direction, one first through hole 51, one second through hole 52, and another first through hole 51 are arranged alternately. The first magnetic post 11a and the second magnetic post 11b are respectively inserted into one first through hole 51. The baffle 13 is inserted into the second through hole 52. Exemplarily, there are multiple insulating plates 50, including a first insulating plate 50a and a second insulating plate 50b. The first insulating plate 50a abuts against the first fixing part 12a of the first magnetic post 11a and the winding body 23 of the first winding 20a, and also abuts against the first fixing part 12a of the second magnetic post 11b and the winding body 23 of the second winding 20b. The second insulating plate 50b abuts against the second fixing part 12b of the first magnetic post 11a and the winding body 23 of the first winding 20a, and also abuts against the second fixing part 12b of the second magnetic post 11b and the winding body 23 of the second winding 20b. In this way, only two insulating plates 50 are needed to improve the withstand voltage performance of each winding 20, which is beneficial to improving the safety of the magnetic device 300. Furthermore, the structure is simple and easy to assemble, which helps to reduce the processing cost of the magnetic device 300.

[0073] In some other embodiments, the insulating plate 50 may also be fitted only onto the outside of the magnetic post 11. The number of insulating plates 50 can be four. Two insulating plates 50 are fitted onto the outside of the first magnetic post 11a; one abuts against the first fixing part 12a of the first magnetic post 11a and the winding body 23 of the first winding 20a, and the other abuts against the second fixing part 12b of the first magnetic post 11a and the winding body 23 of the first winding 20a. Two other insulating plates 50 are fitted onto the outside of the second magnetic post 11b; one abuts against the first fixing part 12a of the second magnetic post 11b and the winding body 23 of the second winding 20b, and the other abuts against the second fixing part 12b of the second magnetic post 11b and the winding body 23 of the second winding 20b. This also improves the withstand voltage performance of each winding 20 to enhance safety in use.

[0074] like Figure 4 , Figure 7 and Figure 9As shown, in some embodiments, the magnetic device 300 further includes a first fixing member 60, which is stacked on one side of the magnetic core 10 in the Z-axis direction (i.e., the axial direction of the magnetic column 11). Specifically, the first fixing member 60 is stacked and fixedly connected to the side of the first fixing part 12a (i.e., fixing part 12) facing away from the magnetic column 11. The first fixing member 60 is provided with a snap-fit ​​hole 61, in which a portion of the winding 20 is snapped, with at least a portion of the end of the winding 20 located on the side of the first fixing member 60 facing away from the magnetic core 10. Specifically, in the Z-axis direction, at least a portion of the end of the winding 20 is located on the side of the first fixing member 60 facing away from the magnetic core 10. The first fixing member 60 is fixedly connected between the partition cavity wall 1011 and the magnetic core 10 and covers the mounting hole 107.

[0075] In this way, by engaging the winding 20 with the snap-fit ​​hole 61, the winding 20 can be limited, preventing the winding 20 from rotating relative to the magnetic post 11 around the Z-axis (i.e., the axial direction of the magnetic post 11), which is beneficial to improving the structural stability and reliability of the magnetic device 300. Moreover, the design of the first fixing member 60 being stacked on one side of the magnetic core 10 in the Z-axis direction (i.e., the axial direction of the magnetic post 11) can prevent the first fixing member 60 from occupying the space of the winding body 23 (i.e., the part of the winding 20 sleeved on the outside of the magnetic post 11) in the circumferential direction of the magnetic post 11, which is beneficial to increasing the contact area between the winding 20 and the airflow outside the receiving cavity 101, and is beneficial to improving the heat dissipation efficiency of the winding 20 and the magnetic device 300. Furthermore, since at least part of the end of the winding 20 is located on the side of the first fixing member 60 facing away from the magnetic core 10, the first fixing member 60 can prevent the magnetic core 10 from contacting the partition cavity wall 1011 (i.e., the cavity wall of the receiving cavity 101), thus preventing damage caused by friction between the magnetic core 10 and the partition cavity wall 1011 (i.e., the cavity wall of the receiving cavity 101), which is beneficial to extending the working life of the magnetic core 10 and the magnetic device 300. In some other embodiments, adhesive can be provided between the winding body 23 and the fixing part 12, and the winding body 23 and the fixing part 12 are fixedly connected by adhesive, which can also prevent the winding 20 from rotating relative to the magnetic post 11.

[0076] exist Figure 4 , Figure 7 and Figure 9In the illustrated embodiment, the first winding 20a and the second winding 20b have similar mating relationships with the first fixing member 60. The first winding 20a will be used as an example for specific explanation. There are multiple snap-fit ​​holes 61, including a first snap-fit ​​hole 611 and a second snap-fit ​​hole 612. In the Y-axis direction, the first snap-fit ​​hole 611 and the second snap-fit ​​hole 612 are spaced apart. The first connecting portion 24 partially snaps into the first snap-fit ​​hole 611. Specifically, the first snap-fit ​​hole 611 includes a first hole 6111 and a second hole 6112. In the Z-axis direction, the first hole 6111 is located on the side of the first fixing member 60 facing away from the magnetic core 10 and extends along the Z-axis direction. In the Y-axis direction, the second hole 6112 is located on one side of the first hole 6111 and communicates with the first hole 6111. The second hole 6112 penetrates the first fixing member 60 along the Y-axis direction. The first connecting segment 241 is located outside the first snap-fit ​​hole 611 and on one side of the first fixing member 60 in the Y-axis direction. The second connecting segment 242 is partially located outside the second hole 6112 and partially housed in the second hole 6112. The third connecting segment 243 is partially housed in the first hole 6111 and partially located on the side of the first fixing member 60 facing away from the magnetic core 10 in the Z-axis direction. In the Z-axis direction, the first end portion 21 is entirely located on the side of the first fixing member 60 facing away from the magnetic core 10. This facilitates increasing the length of the first end portion 21 housed in the receiving cavity 101, making it easier for the first end portion 21 to be electrically connected to the device in the receiving cavity 101. In some other embodiments, the third connecting segment 243 may also be entirely housed in the first hole 6111, with the first end portion 21 partially housed in the first hole 6111 and partially located on the side of the first fixing member 60 facing away from the magnetic core 10. This helps to shorten the length of the first end 21, reduces the length of the wire wound into the winding 20, and reduces the processing cost of the winding 20 and the magnetic device 300.

[0077] The second connecting portion 25 is partially engaged in the second engaging hole 612. Specifically, the second engaging hole 612 includes a third hole 6121 and a fourth hole 6122. In the Z-axis direction, the third hole 6121 is located on the side of the first fixing member 60 facing away from the magnetic core 10 and extends along the Z-axis direction. In the Y-axis direction, the fourth hole 6122 is located on the side of the third hole 6121 facing away from the first engaging hole 611 and communicates with the third hole 6121. The fourth hole 6122 penetrates the first fixing member 60 along the Y-axis direction. The fourth connecting segment 251 is located outside the second engaging hole 612 and is located on the side of the first fixing member 60 facing away from the first connecting segment 241 in the Y-axis direction. The fifth connecting segment 252 is partially located outside the fourth hole 6122 and partially received in the fourth hole 6122. The sixth connecting segment 253 is partially received in the third hole 6121 and partially located on the side of the first fixing member 60 facing away from the magnetic core 10 in the Z-axis direction. In the Z-axis direction, the second end 22 is entirely located on the side of the first fixing member 60 facing away from the magnetic core 10. This facilitates increasing the length of the second end 22 housed in the receiving cavity 101, making it easier for the second end 22 to be electrically connected to the device in the receiving cavity 101. In some other embodiments, the sixth connecting segment 253 may also be entirely housed in the third hole 6121, with a portion of the second end 22 housed in the third hole 6121 and a portion of the second end 22 located on the side of the first fixing member 60 facing away from the magnetic core 10. This facilitates shortening the length of the second end 22, reducing the length of the wire wound into the winding 20, and reducing the processing cost of the winding 20 and the magnetic device 300.

[0078] For example, the first fixing member 60 includes a first plate 62 and a second plate 63. The first plate 62 and the second plate 63 are stacked and fixedly connected in the Z-axis direction by means including but not limited to fasteners, adhesive bonding, or welding. The first plate 62 is stacked and fixedly connected to the magnetic core 10. Specifically, the first plate 62 is stacked and fixedly connected to the first fixing part 12a. In some other embodiments, the first plate 62 and the second plate 63 may also be integrally formed. The first plate 62 and the second plate 63 together form a first snap-fit ​​hole 611 and a second snap-fit ​​hole 612.

[0079] In the X-axis direction, the first connecting segment 241 of the first connecting portion 24 is located on one side of the first plate 62, and the fourth connecting segment 251 of the second connecting portion 25 is located on the side of the first plate 62 opposite to the first connecting segment 241. Specifically, the first plate 62 may be provided with a first receiving groove 64, which is located on one side of the first plate 62 in the Y-axis direction, and the first connecting segment 241 is partially received in the first receiving groove 64. The second plate 63 may be provided with a second receiving groove 65, which is located on the side of the first plate 62 opposite to the first receiving groove 64 and communicates with the fourth hole 6122 of the second snap-fit ​​hole 612. The fourth connecting segment 251 is partially received in the second receiving groove 65. This is beneficial for shortening the length of the first fixed end 231 and the second fixed end 232, reducing the length of the wire wound into the winding 20, and reducing the processing cost of the winding 20 and the magnetic device 300.

[0080] In some embodiments, the first fixing member 60 has a first mounting groove 66 on the side facing the magnetic core 10, and the magnetic core 10 is partially housed in the first mounting groove 66. Specifically, in the Z-axis direction, the first fixing member 60 has a first mounting groove 66 on the side facing the magnetic core 10, and the first mounting groove 66 is located on the side of the first plate 62 facing away from the second plate 63. The first fixing part 12a of each magnetic post 11 is partially housed in the first mounting groove 66. This is beneficial for reducing the size of the magnetic device 300 in the Z-axis direction and for miniaturizing the design of the magnetic device 300.

[0081] In some embodiments, a gasket 70 is provided between the first fixing member 60 and the magnetic core 10, and the gasket 70 is stacked between the first fixing member 60 and the magnetic core 10. Specifically, in the Z-axis direction, the gasket 70 abuts against the first plate 62 and the magnetic core 10, and the gasket 70 is received in the first mounting groove 66. The gasket 70 abuts against the isolation layer 30. Exemplarily, the gasket 70 can be made of insulating materials including but not limited to epoxy resin, plastic, or rubber. This avoids friction between the magnetic core 10 and the first fixing member 60, which could damage the isolation layer 30 or even the magnetic core 10, thus improving the structural stability and reliability of the magnetic core 10 and extending the service life of the magnetic core 10 and the magnetic device 300.

[0082] In some embodiments, the magnetic device 300 further includes a sealing ring 80, which is disposed on the side of the first fixing member 60 facing away from the magnetic core 10. The sealing ring 80 surrounds the end of the assembly 20 around the Z-axis (i.e., the axial direction of the magnetic column 11). Specifically, in the Z-axis direction, the sealing ring 80 is disposed on the side of the first fixing member 60 facing away from the magnetic core 10, and the sealing ring 80 surrounds the first end 21 and the second end 22 around the Z-axis. The sealing ring 80 abuts against the first fixing member 60 and the partition cavity wall 1011. Thus, when the end of the winding 20 is housed in the receiving cavity 101, a portion of the winding 20 (e.g., the first connecting portion 24 and the second connecting portion 25) passes through the partition cavity wall 1011 (i.e., the cavity wall of the receiving cavity 101). The sealing ring 80 can abut against the partition cavity wall 1011 (i.e., the cavity wall of the receiving cavity 101). The sealing ring 80 and the first fixing member 60 can achieve a seal on the receiving cavity 101, which is beneficial for improving the sealing of devices (e.g., devices in the receiving cavity 101) within the receiving cavity 101. Figure 3 The safety of the power device 500 shown is improved, which helps to extend the service life of the device (e.g., power device 500) in the housing cavity 101.

[0083] In some embodiments, the first fixing member 60 has a groove 67 on the side facing away from the magnetic core 10. Specifically, in the Z-axis direction, the first fixing member 60 has a groove 67 on the side facing away from the magnetic core 10. The sealing ring 80 is received in the groove 67. The groove 67 surrounds the first end 21 and the second end 22 around the Z-axis direction. This is beneficial to improving the space utilization of the sealing ring 80 and the first fixing member 60, and to reducing the size of the magnetic device 300 in the Z-axis direction (i.e., the axial direction of the magnetic column 11), which is beneficial to the miniaturization and lightweight design of the magnetic device 300.

[0084] In some embodiments, the first fixing member 60 has a limiting groove 68 on the side facing away from the magnetic core 10. Specifically, in the Z-axis direction, the first fixing member 60 has a limiting groove 68 on the side facing away from the magnetic core 10. The partition cavity wall 1011 includes a protrusion 1012, which is engaged in the limiting groove 68. The limiting groove 68 surrounds the first end 21 and the second end 22 around the Z-axis direction. Specifically, the limiting groove 68 surrounds the sealing ring 80. The protrusion 1012 protrudes in a direction away from the receiving cavity 101. In this way, the engagement of the protrusion 1012 with the limiting groove 68 can achieve a fixed connection between the housing 100 and the magnetic device 300, which is beneficial to improving the structural stability and reliability of the power conversion device 1000.

[0085] like Figure 4 , Figure 5 and Figure 7As shown, in some embodiments, the magnetic device 300 further includes a second fixing member 90 and a connecting member 90a. The second fixing member 90 is stacked on the side of the magnetic core 10 facing away from the first fixing member 60, and the connecting member 90a is disposed between the first fixing member 60 and the second fixing member 90. The magnetic core 10 is clamped between the first fixing member 60 and the second fixing member 90. In this way, by controlling the size of the connecting member 90a in the Z-axis direction (i.e., the axial direction of the magnetic column 11), it can be ensured that the magnetic core 10 is clamped between the first fixing member 60 and the second fixing member 90, realizing a fixed connection between the magnetic core 10 and the first fixing member 60. Not only is the connection between the magnetic core 10 and the first fixing member 60 detachable, which facilitates the maintenance or replacement of the first fixing member 60 and helps to extend the working life of the magnetic device 300, but it also facilitates assembly and helps to reduce the processing cost of the magnetic device 300.

[0086] exist Figure 4 , Figure 5 and Figure 7 In the illustrated embodiment, the first fixing member 60 has a first fixing hole 69 on the side facing the second fixing member 90. The first fixing hole 69 extends along the Z-axis direction. Specifically, the first fixing hole 69 penetrates the first plate 62 along the Z-axis direction. The second fixing member 90 has a second fixing hole 91 on the side facing the first fixing member 60. The second fixing hole 91 extends along the Z-axis direction. The connector 90a extends along the Z-axis direction. The connector 90a is fixedly connected to the first fixing hole 69 and the second fixing hole 91 by means including but not limited to adhesive bonding, threaded connection, or snap-fit ​​connection. The connector 90a is spaced apart from the magnetic core 10 and the winding 20. The second fixing member 90 has a second mounting groove 92 on the side facing the first fixing member 60, and the magnetic core 10 is partially accommodated in the second mounting groove 92. This is beneficial for reducing the size of the magnetic device 300 in the Z-axis direction and for miniaturizing the design of the magnetic device 300.

[0087] For example, there are multiple first fixing holes 69, multiple second fixing holes 91, and multiple connectors 90a. The first fixing holes 69, the second fixing holes 91, and the connectors 90a correspond one-to-one. Multiple connectors 90a are spaced apart around the magnetic core 10. In this way, airflow outside the receiving cavity 101 can flow through the gap between adjacent connectors 90a through the winding body 23 (i.e., the portion of the winding 20 sleeved on the outside of the magnetic post 11), which helps to increase the contact area between the winding 20 and the airflow outside the receiving cavity 101, and improves the heat dissipation efficiency of the winding 20 and the magnetic device 300. For example, there are four connectors 90a. In some other embodiments, the number of connectors 90a may be two, three, or more. In other embodiments, the number of connectors 90a may be one, for example, the connector 90a is a sleeve, and the connector 90a surrounds the magnetic core 10. The connector 90a is provided with a ventilation hole, and the winding body 23 is exposed outside the connector 90a through the ventilation hole.

[0088] Please see Figure 10 and combined Figure 9 , Figure 10 This is a schematic diagram of another magnetic device 300 provided in the embodiments of this application.

[0089] like Figure 9 and Figure 10 As shown, Figure 10 The illustrated embodiments and Figure 9 The structures of the illustrated embodiments are similar, except that the positions of the ends of the winding 20 are different, and correspondingly, the structures of the first connecting portion 24 and the second connecting portion 25 of the winding 20 are different, as is the structure of the first fixing member 60. Figure 10 In the illustrated embodiment, in the Z-axis direction, the end of the winding 20 is located on one side of the magnetic core 10. The projection of the end of the winding 20 along the Z-axis direction is spaced apart from the projection of the magnetic core 10 along the Z-axis direction. Specifically, the first fixing member 60 is a separate component, namely, the first plate 62 and the second plate 63 are integrally formed. The first fixing member 60 is provided with a snap-fit ​​hole 61, which penetrates the first fixing member 60 along the Z-axis direction. The projection of the snap-fit ​​hole 61 along the Z-axis direction is spaced apart from the projection of the magnetic core 10 along the Z-axis direction. There are multiple snap-fit ​​holes 61, including a first snap-fit ​​hole 611 and a second snap-fit ​​hole 612. In the Y-axis direction, the first snap-fit ​​hole 611 and the second snap-fit ​​hole 612 are located on both sides of the magnetic core 10.

[0090] The winding 20 includes a first end 21, a second end 22, a winding body 23, a first connecting portion 24, and a second connecting portion 25. The winding body 23 includes a first fixed end 231 and a second fixed end 232. The first connecting portion 24 is fixedly connected to the first fixed end 231 and extends along the Z-axis direction, passing through and engaging in a first engaging hole 611 along the Z-axis direction. The second connecting portion 25 is fixedly connected to the second fixed end 232 and extends along the Z-axis direction, passing through and engaging in a second engaging hole 612 along the Z-axis direction. The first end 21 is fixedly connected to the first connecting portion 24 and extends along the Z-axis direction. The first end 21 is located on the side of the first fixing member 60 facing away from the magnetic core 10 in the Z-axis direction. The projection of the first end 21 along the Z-axis direction is spaced apart from the projection of the magnetic core 10 along the Z-axis direction. The second end 22 is fixedly connected to the second connecting portion 25 and extends along the Z-axis direction. The second end 22 is located on the side of the first fixing member 60 facing away from the magnetic core 10 in the Z-axis direction. The projection of the second end 22 along the Z-axis direction is spaced apart from the projection of the magnetic core 10 along the Z-axis direction. This helps to reduce the difficulty of setting the snap-fit ​​hole 61, simplifies the processing difficulty of the first fixing member 60, and reduces processing costs.

Claims

1. A magnetic device, characterized in that, The magnetic device includes a magnetic core and a winding. The entire exterior of the magnetic core is covered with an insulating layer. The magnetic core includes a magnetic post. The winding is sleeved on the exterior of the magnetic post. The winding is partially covered with an insulating layer, and the ends of the winding are exposed outside the insulating layer.

2. The magnetic device according to claim 1, characterized in that, Along the axial direction of the magnetic column, the end of the winding is located on one side of the magnetic core.

3. The magnetic device according to claim 1 or 2, characterized in that, The projection of the end of the winding along the axial direction of the magnetic post is located inside the projection of the magnetic core along the axial direction of the magnetic post.

4. The magnetic device according to any one of claims 1-3, characterized in that, The end of the winding extends along the axial direction of the magnetic post.

5. The magnetic device according to any one of claims 1-4, characterized in that, The magnetic core further includes a fixing part, which is disposed on one side of the magnetic column along the axial direction. The area of ​​the fixed part projected along the axial direction of the magnetic column is larger than the area of ​​the magnetic column projected along the axial direction of the magnetic column. The magnetic device also includes an insulating plate, which is sleeved on the outside of the magnetic column and located between the fixing part and the winding.

6. The magnetic device according to any one of claims 1-5, characterized in that, The magnetic device further includes a first fixing member. Along the axial direction of the magnetic column, the first fixing member is stacked on one side of the magnetic core. The first fixing member is provided with a snap-fit ​​hole, and the winding portion is snapped into the snap-fit ​​hole. At least part of the end of the winding is located on the side of the first fixing member opposite to the magnetic core.

7. The magnetic device according to claim 6, characterized in that, The magnetic device further includes a second fixing member and a connecting member. The second fixing member is stacked on the side of the magnetic core facing away from the first fixing member. The connecting member is disposed between the first fixing member and the second fixing member. The magnetic core is clamped between the first fixing member and the second fixing member.

8. The magnetic device according to claim 7, characterized in that, The number of connectors is multiple, and the multiple connectors are arranged at intervals around the magnetic core.

9. The magnetic device according to any one of claims 6-8, characterized in that, The magnetic device further includes a sealing ring, which is disposed on the side of the first fixing member facing away from the magnetic core, and the sealing ring surrounds the end of the winding around the magnetic post axially.

10. The magnetic device according to claim 9, characterized in that, The first fixing member has a groove on the side facing away from the magnetic core, and the sealing ring is received in the groove.

11. The magnetic device according to any one of claims 1-10, characterized in that, The number of magnetic pillars and the number of windings are both multiple. The multiple magnetic pillars are arranged sequentially at intervals in the radial direction of the magnetic pillars. Each winding is sleeved on the outside of one magnetic pillar. In a direction perpendicular to the first plane, the end of one winding is opposite to the end of another winding and is arranged at intervals. The axes of the multiple magnetic pillars are located in the first plane.

12. A power conversion device, characterized in that, The power conversion device includes a housing and a magnetic device as described in any one of claims 1-11. The housing includes a receiving cavity, the magnetic device is located outside the receiving cavity, and the end of the winding is received in the receiving cavity.

13. The power conversion device according to claim 12, characterized in that, The power conversion device includes a power device housed in the housing cavity and electrically connected to the end of the winding.

14. The power conversion device according to claim 12 or 13, characterized in that, The power conversion device further includes a fan, the housing includes an air duct, the air duct is spaced apart from the receiving cavity, and the fan and some of the magnetic components are located in the air duct.

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