A multi-duct transformer

Abstract

This application discloses a multi-channel transformer, comprising: a core assembly including multiple cores arranged sequentially at predetermined intervals to form a first heat dissipation channel extending along the magnetic circuit direction between any two adjacent cores; a primary winding wound around the core assembly; and a secondary winding wound around the primary winding, maintaining a predetermined interval between the secondary winding and the primary winding to form a second heat dissipation channel extending along the magnetic circuit direction between the primary and secondary windings; the second heat dissipation channel partially overlaps with the first heat dissipation channel. By forming the first and second heat dissipation channels within the multi-channel transformer, this application significantly improves the heat dissipation efficiency of the core and windings, while also reducing total eddy current losses. Furthermore, due to the predetermined intervals, the core, primary winding, and secondary winding do not compress each other when their volume expands, effectively reducing core cracking and winding insulation damage.

Description

Technical Field

[0001] This application relates to the field of transformer technology, specifically to a multi-duct transformer. Background Technology

[0002] Transformers are critical components widely used in power electronic systems, and their performance directly affects the efficiency and reliability of the entire system. As power electronics technology advances towards higher frequencies and higher power densities, the heat dissipation problem of transformers is becoming increasingly prominent. Current solutions typically involve external air or water cooling devices to lower the transformer's temperature. However, these cooling methods suffer from significant differences in cooling efficiency at different locations, especially air cooling, which can easily lead to localized hot spots inside the transformer. While water cooling offers higher efficiency, it requires additional pumps, piping, and sealing structures, significantly increasing the overall system size and cost. It also increases potential points of failure, making it difficult to meet the demands of applications with high cost-effectiveness and reliability requirements. Summary of the Invention

[0003] This application aims to address one of the technical problems in related technologies to a certain extent. To this end, this application provides a multi-duct transformer.

[0004] To achieve the above objectives, this application adopts the following technical solution: a multi-duct transformer, comprising:

[0005] A magnetic core assembly includes multiple sets of magnetic cores, and the multiple sets of magnetic cores are arranged sequentially at a predetermined interval to form a first heat dissipation channel extending along the magnetic circuit direction between any two adjacent sets of magnetic cores.

[0006] The primary winding is wound around the outside of the magnetic core assembly;

[0007] The secondary winding is wound outside the primary winding, and the secondary winding and the primary winding maintain a predetermined interval to form a second heat dissipation air duct extending along the magnetic circuit direction between the primary winding and the secondary winding.

[0008] The second heat dissipation duct partially overlaps with the first heat dissipation duct.

[0009] The application of this application has the following beneficial effects: By designing a single magnetic core structure as multiple spaced magnetic cores and setting a predetermined interval between adjacent magnetic cores to form a first heat dissipation channel, the heat dissipation surface of the magnetic core can be significantly increased, thereby improving the heat dissipation efficiency of the magnetic core. Simultaneously, setting a predetermined interval between the primary winding and the secondary winding to form a second heat dissipation channel allows the cooling air to directly pass through the core heat-generating area of ​​the multi-channel transformer, preventing heat accumulation between winding layers, thereby improving the heat dissipation efficiency of the windings. During transformer operation, the area where the magnetic core column and the primary winding are close together is the 'dual heat source' convergence area with the highest heat density. The second heat dissipation channel in this application, which partially overlaps with the first heat dissipation channel, forms a composite three-dimensional heat dissipation channel, enabling powerful directional heat dissipation from the aforementioned 'dual heat source' convergence area, preventing heat accumulation in the area where the windings and the magnetic core are close together. Further analysis reveals that, due to the predetermined interval between adjacent magnetic cores and between the primary winding and the secondary winding, when the temperature of the multi-channel transformer rises, the magnetic core, primary winding, and secondary winding will not squeeze each other when they expand in volume (or the squeezing pressure is significantly reduced compared to existing transformers), which can effectively reduce magnetic core cracking, winding insulation damage, and other issues.

[0010] Furthermore, by designing a single magnetic core structure as multiple spaced cores, the thickness of each core is reduced while maintaining the total effective cross-sectional area. Since eddy current losses are proportional to the square of the core thickness, the total eddy current losses are significantly reduced. Simultaneously, compared to the abrupt change in magnetic reluctance at the edges of large-sized magnetic cores, where magnetic lines of force tend to squeeze towards the edges, redesigning the large-sized core as multiple thinner cores increases the edge area ratio of each thinner core, resulting in a more uniform magnetic flux distribution and avoiding extreme magnetic flux saturation at the edges of a single thick core.

[0011] Optionally, the multi-duct transformer further includes an insulating support member disposed between the primary winding and the secondary winding, the insulating support member being used to abut against the primary winding and the secondary winding respectively to maintain the predetermined interval.

[0012] Optionally, multiple insulating support members are provided, and the multiple insulating support members are distributed at circumferential intervals along the primary winding.

[0013] Optionally, the width of the first heat dissipation duct is between 0.5 mm and 3 mm, and the width of the second heat dissipation duct is between 1 mm and 5 mm.

[0014] Optionally, the magnetic core is an E-type magnetic core.

[0015] Optionally, the width of each magnetic core is D, and the width of the first heat dissipation duct is d, where D ≥ 5d.

[0016] Optionally, the number of magnetic cores provided shall be no less than two and no more than ten.

[0017] Optionally, the magnetic core assembly further includes an insulating thermally conductive component disposed between any two adjacent magnetic cores. The insulating thermally conductive component is bonded and fixed to the magnetic cores located on both sides thereon, and the thermal conductivity of the insulating thermally conductive component is not less than 1 W / (m·K).

[0018] Optionally, the insulating thermally conductive element is made of silicone, and the thermal conductivity of the insulating thermally conductive element is between 2.5 W / (m·K) and 5 W / (m·K).

[0019] Optionally, the insulating heat-conducting component is in the form of a block, and the portion of the insulating heat-conducting component that does not overlap with the second heat-conducting channel in the first heat-conducting channel is distributed in an array. The cross-sectional area of ​​the first heat-conducting channel between two adjacent magnetic cores is S, and the sum of the cross-sectional areas of all the insulating heat-conducting components located between the two magnetic cores is P, where 0.05S≤P≤0.4S.

[0020] Optionally, the insulating heat-conducting element is elongated and configured to guide the cooling airflow toward the portion of the second cooling airflow that overlaps with the first cooling airflow.

[0021] Optionally, the primary winding has a first winding segment located within a first heat dissipation duct, and the secondary winding has a second winding segment located within a second heat dissipation duct, wherein the first winding segment and the corresponding second winding segment form an overlapping duct that coincides with the first heat dissipation duct.

[0022] The insulating heat-conducting element is arranged at an angle and has an outer end close to the outer surface of the magnetic core and an inner end away from the outer surface of the magnetic core. At least one set of the insulating heat-conducting element is provided. One set of the insulating heat-conducting element includes an insulating heat-conducting element whose inner end extends to the first winding segment and an insulating heat-conducting element whose inner end extends to the second winding segment. The two insulating heat-conducting elements in one set are inclined in opposite directions.

[0023] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. Preferred embodiments or means of this application will be illustrated in detail with reference to the accompanying drawings, but are not intended to limit the technical solutions of this application. Furthermore, each of these features, elements, and components appearing in the following text and drawings is a plurality, and different symbols or numbers are used for convenience of representation, but all represent components with the same or similar structure or function. Attached Figure Description

[0024] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0025] Figure 1This is a schematic diagram of the structure of a multi-duct transformer provided in Embodiment 1 of this application;

[0026] Figure 2 This is a front view of the multi-duct transformer in Example 1;

[0027] Figure 3 This is a side view of the multi-duct transformer in Embodiment 1;

[0028] Figure 4 This is a cross-sectional view of the multi-duct transformer in Embodiment 1;

[0029] Figure 5 A schematic diagram of the transformer is provided for comparison.

[0030] Figure 6 The simulation results of the multi-duct transformer (sample 1) provided in Example 1 are shown in the figure.

[0031] Figure 7 The simulation results are shown in the diagram of the transformer (sample 2) provided in the comparative example.

[0032] Figure 8 This is a front view of a multi-duct transformer provided in Embodiment 2;

[0033] Figure 9 This is a side sectional view of the multi-duct transformer provided in Embodiment 2;

[0034] Figure 10 This is a side sectional view of the multi-duct transformer provided in Embodiment 3.

[0035] Among them, 1. Magnetic core; 10. First heat dissipation air duct; 11. Straight arm; 12. Side post; 13. Middle post; 14. Window; 2. Primary winding; 20. First winding segment; 3. Secondary winding; 30. Second winding segment; 4. Second heat dissipation air duct; 40. Overlapping air duct; 5. Insulating support component; 6. Substrate; 7. Insulating heat-conducting component; 8. Comparison magnetic core; 9. Comparison winding. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0037] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0038] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, the internal connection of two elements, or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Example 1: This example provides a multi-duct transformer, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the multi-channel transformer includes a magnetic core assembly, a primary winding 2, and a secondary winding 3. The magnetic core assembly includes multiple magnetic cores 1, which are arranged sequentially at predetermined intervals to form a first heat dissipation channel 10 extending along the magnetic circuit direction between any two adjacent magnetic cores 1. The primary winding 2 is wound around the magnetic core assembly, and the secondary winding 3 is wound around the primary winding 2, with a predetermined interval maintained between the secondary winding 3 and the primary winding 2 to form a second heat dissipation channel 4 extending along the magnetic circuit direction between the primary winding 2 and the secondary winding 3. Simultaneously, the second heat dissipation channel 4 partially overlaps with the first heat dissipation channel 10.

[0041] By designing a single magnetic core structure as multiple spaced magnetic cores 1, and setting a predetermined interval between adjacent magnetic cores 1 to form a first heat dissipation channel 10, the heat dissipation surface of the magnetic core 1 can be significantly increased, thereby improving the heat dissipation efficiency of the magnetic core 1. Simultaneously, a predetermined interval is set between the primary winding 2 and the secondary winding 3 to form a second heat dissipation channel 4, allowing the cooling air to directly pass through the core heat-generating area of ​​the multi-channel transformer, preventing heat accumulation between winding layers, thereby improving the heat dissipation efficiency of the windings. The second heat dissipation channel 4 partially overlaps with the first heat dissipation channel 10, allowing the cooling air to simultaneously carry away heat from both the magnetic core 1 and the windings within the overlapping area, preventing heat accumulation at the location where the windings and magnetic core 1 are close together (the area where heat accumulates in the multi-channel transformer).

[0042] Further analysis shows that, since there is a set interval between the two adjacent magnetic cores 1 and a predetermined interval between the primary winding and the secondary winding, when the temperature of the multi-channel transformer rises, the magnetic core 1, the primary winding 2 and the secondary winding 3 will not squeeze each other when they expand in volume (or the squeezing pressure is significantly reduced compared to existing transformers), which can effectively reduce the cracking of the magnetic core 1 and the damage to the winding insulation.

[0043] In addition, by designing the entire magnetic core structure as multiple spaced magnetic cores 1, the thickness of each magnetic core 1 is reduced while maintaining the total effective cross-sectional area. Since eddy current loss is proportional to the square of the thickness of magnetic core 1, the total eddy current loss will be significantly reduced.

[0044] It should be noted that the magnetic circuit direction refers to the direction of magnetic field lines flowing in the closed loop inside the magnetic core 1. Specifically, this embodiment uses an EE-type magnetic core as an example. Each EE-type magnetic core consists of two single core pieces spliced ​​together. Each EE-type magnetic core includes two straight arms 11 on both sides, a central column 13 located in the middle of the straight arms 11, and side columns 12 located at both ends of the straight arms 11. A window 14 is formed between the central column 13 and the side columns 12. The primary winding 2 and the secondary winding 3 pass through the window 14 and are wound around the central column 13. When the multi-duct transformer is working, the magnetic field lines flow along the central column 13... Figure 3 The flow is in the direction indicated by the middle arrow M, and the magnetic field lines run along the side post 12. Figure 3 The airflow flows in the direction indicated by arrow N, and the magnetic field lines also flow along the straight arm 11 to eventually form a closed loop. In this embodiment, "forming a first heat dissipation duct 10 extending along the magnetic circuit direction between any two adjacent magnetic cores 1" and "forming a second heat dissipation duct 4 extending along the magnetic circuit direction between the primary winding 2 and the secondary winding 3" means that the extension direction of the first heat dissipation duct 10 and the extension direction of the second heat dissipation duct 4 are both parallel to the direction indicated by arrow M or arrow N. This ensures that the first heat dissipation duct 10 and the second heat dissipation duct 4 function entirely as flow gaps for cooling air to pass through, without forming a working air gap that cuts through the magnetic circuit, thus avoiding negative effects (such as a sharp increase in magnetic reluctance, a surge in excitation current, or a significant decrease in inductance).

[0045] It is easy to understand that the multi-duct transformer also includes a base plate 6 for supporting the arrangement of magnetic cores 1, with each magnetic core 1 being supported and positioned on the base plate 6.

[0046] Furthermore, the multi-duct transformer provided in this embodiment also includes an insulating support member 5 disposed between the primary winding 2 and the secondary winding 3. The insulating support member 5 is used to abut against the primary winding 2 and the secondary winding 3 respectively to maintain a predetermined interval. It is easy to understand that since the primary winding 2 and the secondary winding 3 are generally made of copper wire, they have a certain strength and can maintain their shape to a certain extent when wound into a ring structure. By adding the insulating support member 5, the stability of the predetermined interval can be further enhanced, avoiding changes in the predetermined interval caused by deformation of the primary winding 2 or the secondary winding 3 due to vibration and bumps during transportation or installation.

[0047] Specifically, in this embodiment, such as Figure 4 As shown, multiple insulating support members 5 are provided, and the multiple insulating support members 5 are distributed at intervals along the circumference of the primary winding 2. By adopting the above structural design, the predetermined interval between the primary winding 2 and the secondary winding 3 can be kept stable and approximately equal, and the excessive obstruction of the heat dissipation air of the second heat dissipation duct 4 can be avoided, thus ensuring the unobstructed flow of the second heat dissipation duct 4 while ensuring structural stability.

[0048] Through experimental verification and theoretical analysis, it was found that if the width of the first heat dissipation duct 10 and the second heat dissipation duct 4 is too large, it will lead to an increase in magnetic leakage between the magnetic cores 1; if the width of the first heat dissipation duct 10 and the second heat dissipation duct 4 is too small, it will lead to a decrease in the required heat dissipation efficiency. Therefore, in this embodiment, the width of the first heat dissipation duct 10 and the second heat dissipation duct 4 is further designed. Specifically, in this embodiment, five magnetic cores 1 are provided, and four first heat dissipation ducts 10 extending along the magnetic circuit direction are formed between the five magnetic cores 1. At the same time, a second heat dissipation duct 4 in a ring shape extending along the magnetic circuit direction is formed between the primary winding 2 and the secondary winding 3. The width of the first heat dissipation duct 10 refers to the distance between two adjacent magnetic cores 1, and the width of the second heat dissipation duct 4 refers to the distance between the primary winding 2 and the secondary winding 3. In this embodiment, the width of the first heat dissipation duct 10 is 0.8 mm, and the width of the second heat dissipation duct 4 is 1.2 mm. In other alternative embodiments, the width of the first heat dissipation duct 10 can be designed to be between 0.5 mm and 3 mm, and the width of the second heat dissipation duct 4 can be designed to be between 1 mm and 5 mm.

[0049] In this embodiment, the magnetic core 1 is an EE type magnetic core. In other optional embodiments, the magnetic core 1 can be an E type magnetic core, such as EE type magnetic core, EI type magnetic core, EEL type magnetic core, EF type magnetic core, ER type magnetic core, ETD type magnetic core, EER type magnetic core, etc.

[0050] In addition to limiting the width of the first heat dissipation duct 10, this embodiment also limits the number of magnetic cores 1 and the size ratio of each magnetic core 1 relative to the first heat dissipation duct 10. Specifically, the width of each magnetic core 1 in this embodiment is D, and the width of the first heat dissipation duct 10 in this embodiment is d, where D = 6d. In other optional embodiments, D ≥ 5d.

[0051] As mentioned above, the magnetic core assembly in this embodiment includes five magnetic cores 1. In other optional embodiments, the number of magnetic cores 1 is not less than two and not more than ten.

[0052] Combination Figure 5 , Figure 6 and Figure 7 As shown, taking the multi-duct transformer provided in this embodiment as sample one, with... Figure 5 The transformer shown is Sample 2. The heat distribution of Sample 1 and Sample 2 under the same operating conditions is verified by simulation to illustrate that the multi-channel transformer provided in this embodiment can significantly improve the heat dissipation effect through the synergistic effect of the first heat dissipation channel 10 and the second heat dissipation channel 4.

[0053] Specifically, Figure 5 The transformer shown includes a comparison core 8 and a comparison winding 9 wound on the comparison core 8. Similarly, the comparison winding 9 also includes inner and outer windings, with a gap forming between the inner and outer windings as a heat dissipation channel. Figure 1 and Figure 5 As shown, the only difference between Sample 2 and Sample 1 is that the comparison core 8 in Sample 2 is a single core structure, meaning that the comparison core 8 in Sample 2 is a relatively large core. In contrast, the core assembly in Sample 1 consists of five relatively small cores 1, with a first heat dissipation channel 10 formed between adjacent cores 1.

[0054] In the electromagnetic analysis simulation tool (Ansoft Maxwell), after applying the same excitation, material parameters, boundary conditions, and solution settings to Sample 1 and Sample 2, the actual usage conditions were simulated, and the final results were as follows: Figure 6 and Figure 7The simulation results are shown. It can be seen that the highest temperature region in Sample 1 is the area on the primary winding 2 close to the central post 13 in the magnetic core 1, with a maximum temperature of 50.679℃. In Sample 1, the two outermost magnetic cores 1, being spaced apart from the other magnetic cores 1 and located on the outer side, have the lowest temperature in the area where their side posts 12 are located, reaching 36.608℃. In Sample 2, the highest temperature range occurs in the area near the winding structure with the central post 13, reaching a maximum temperature of 76.190℃. In Sample 2, the outermost region of the comparison winding 9 has the lowest temperature, with a minimum temperature of 50.860℃. This comparative experiment shows that the multi-channel transformer provided in the embodiment can significantly improve heat dissipation through the synergistic effect of the first heat dissipation channel 10 and the second heat dissipation channel 4.

[0055] Furthermore, Sample 1 and Sample 2 are made of the same grade of ferrite. The sum of the width dimensions of the five magnetic cores 1 in Sample 1 is designed to be equal to the width dimension of the comparison magnetic core 8 in Sample 2. In this case, the total effective magnetic volume V of Sample 1 and Sample 2 is basically the same. Under the condition that the operating frequency f, the number of turns on the primary and secondary sides, the excitation current I, and the target magnetic flux density Bm are kept consistent, in terms of losses, the eddy current loss of Sample 1 can be reduced to about one-quarter of the eddy current loss of Sample 2, the hysteresis loss of Sample 1 is roughly equal to the hysteresis loss of Sample 2, and the total iron loss of Sample 1 can be reduced to about 65% of the total iron loss of Sample 2. In terms of magnetic field stability, since the total iron loss of Sample 1 is reduced, and iron loss is almost the only heat source of magnetic core 1, the heat dissipation area of ​​magnetic core 1 is significantly increased, ultimately making the temperature rise of Sample 1 no more than one-quarter of the temperature rise of Sample 2.

[0056] Example 2: This example also provides a multi-duct transformer, such as... Figure 8 and Figure 9 As shown, the difference between the multi-duct transformer provided in this embodiment and the multi-duct transformer in Embodiment 1 is that the magnetic core assembly in the multi-duct transformer provided in this embodiment further includes an insulating heat-conducting component 7 disposed between any two adjacent magnetic cores 1. The insulating heat-conducting component 7 is bonded and fixed to the magnetic cores 1 located on both sides thereon, and the thermal conductivity of the insulating heat-conducting component 7 is not less than 1 W / (m·K).

[0057] By incorporating the insulating heat-conducting component 7, adjacent magnetic cores 1 can be bonded and fixed, significantly increasing the relative stability among the five magnetic cores 1 and greatly reducing the possibility of relative displacement of the magnetic cores 1 due to vibration or thermal expansion. Furthermore, the insulating heat-conducting component 7, with a thermal conductivity of not less than 1 W / (m·K), can act as a thermal bridge, rapidly transferring internal heat from each magnetic core 1 to the area of ​​the first heat dissipation duct 10, accelerating the removal of internal heat and improving heat dissipation efficiency.

[0058] Specifically, in this embodiment, the insulating thermally conductive element 7 is made of silicone, and its thermal conductivity is 3 W / (m·K). In other optional embodiments, the thermal conductivity of the insulating thermally conductive element 7 is between 2.5 W / (m·K) and 5 W / (m·K). Silicone material has good insulation, adhesion, and elasticity, and can adapt to the stress generated by the thermal expansion of the magnetic core 1. A thermal conductivity between 2.5 W / (m·K) and 5 W / (m·K) is a preferred embodiment that balances performance and cost.

[0059] To achieve better heat dissipation and bonding stability, this embodiment also designs the shape and distribution of the insulating heat-conducting element 7, specifically, as follows: Figure 9 As shown, the insulating heat-conducting component 7 in this embodiment is block-shaped, and the portions of the insulating heat-conducting component 7 that do not overlap with the second heat-conducting air duct 4 in the first heat dissipation air duct 10 are arranged in an array. Meanwhile, the cross-sectional area of ​​the first heat dissipation air duct 10 between two adjacent magnetic cores 1 is S, and the sum of the cross-sectional areas of all the insulating heat-conducting components 7 located between the two magnetic cores 1 is P. In this embodiment, the ratio of S to P is limited, specifically: 0.05S ≤ P ≤ 0.4S.

[0060] The above structural design avoids the blockage of the first heat dissipation airflow 10 caused by an excessive number and large area of ​​insulating heat-conducting components 7, thus maintaining the advantage of improved heat dissipation efficiency brought by the insulating heat-conducting components 7. Simultaneously, the arrayed distribution of insulating heat-conducting components 7 can fully accommodate all positions of the magnetic core 1, increasing the bonding stability between adjacent magnetic cores 1. Furthermore, the insulating heat-conducting components 7 are located in the portion of the first heat dissipation airflow 10 that does not overlap with the second heat dissipation airflow 4, avoiding increased flow resistance in the overlapping area (the area where the magnetic core 1 is close to the winding and where heat is concentrated), ensuring sufficient cooling airflow to the areas most in need of heat dissipation.

[0061] The insulating and heat-conducting component 7 can be thermally conductive silicone, such as a paste-like thermally conductive silicone, which is applied to a predetermined position on the magnetic core 1 by coating. It can be converted into an elastic rubber solid by vulcanization reaction with moisture in the air and is fixedly bonded to the magnetic core 1.

[0062] Example 3: This example also provides a multi-duct transformer, such as... Figure 10 As shown, the difference between the multi-duct transformer provided in this embodiment and the multi-duct transformer in Embodiment 2 lies in the shape and arrangement of the insulating heat-conducting component 7 in the multi-duct transformer provided in this embodiment. Specifically, in conjunction with... Figure 9 and Figure 10As shown, in Embodiment 2, the block-shaped insulating heat-conducting components 7 are arranged in an array. In this embodiment, the insulating heat-conducting components 7 are elongated and configured to guide the heat dissipation air to the part of the second heat dissipation air duct 4 that overlaps with the first heat dissipation air duct 10.

[0063] Specifically, for ease of description, such as Figure 8 As shown, in this embodiment, a coinciding air duct 40 is defined: the primary winding 2 has a first winding segment 20 located within the first heat dissipation air duct 10, and the secondary winding 3 has a second winding segment 30 located within the second heat dissipation air duct 4. The first winding segment 20 and the corresponding second winding segment 30 form a coinciding air duct 40 that coincides with the first heat dissipation air duct 10. That is, the coinciding air duct 40 is a part of the second heat dissipation air duct 4, and the coinciding air duct 40 is the part of the second heat dissipation air duct 4 that coincides with the first heat dissipation air duct 10.

[0064] like Figure 10 As shown, in this embodiment, the insulating heat-conducting element 7 is arranged at an angle and has an outer end close to the outer surface of the magnetic core 1 and an inner end away from the outer surface of the magnetic core 1. At least one set of insulating heat-conducting elements 7 is provided. One set of insulating heat-conducting elements 7 includes an insulating heat-conducting element 7 whose inner end extends to the first winding segment 20 and an insulating heat-conducting element 7 whose inner end extends to the second winding segment 30. The two insulating heat-conducting elements 7 in one set of insulating heat-conducting elements 7 have opposite inclination directions. Through the above structural design, the two insulating heat-conducting elements 7 in one set of insulating heat-conducting elements 7 can form a V-shaped structure with the outer dimension larger than the inner dimension, thereby guiding the heat dissipation airflow flowing in from the outside to coincide with the airflow channel 40.

[0065] As mentioned earlier, the primary winding 2 and secondary winding 3 near the overlapping air duct 40 are more prone to heat concentration because they extend into the window 14 of the magnetic core 1. By adopting the above structural design, the heat dissipation airflow can be guided to the area where heat is concentrated, further improving heat dissipation efficiency. It should be noted that... Figure 10 The diagram shows a case where two sets of insulating heat-conducting elements 7 are provided at both ends of the magnetic core 1. This is for illustrative purposes only. In practice, depending on the configuration of the air-cooling device, the insulating heat-conducting elements 7 can be placed on the side where the heat dissipation air is blown in, according to the direction of the airflow.

[0066] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art will understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. A multi-duct transformer, characterized by, include: A magnetic core assembly includes multiple sets of magnetic cores, and the multiple sets of magnetic cores are arranged sequentially at a predetermined interval to form a first heat dissipation channel extending along the magnetic circuit direction between any two adjacent sets of magnetic cores. The primary winding is wound around the outside of the magnetic core assembly; The secondary winding is wound outside the primary winding, and the secondary winding and the primary winding maintain a predetermined interval to form a second heat dissipation air duct extending along the magnetic circuit direction between the primary winding and the secondary winding. The second heat dissipation duct partially overlaps with the first heat dissipation duct.

2. The multi-duct transformer as described in claim 1, characterized in that, The multi-duct transformer also includes an insulating support member disposed between the primary winding and the secondary winding. The insulating support member is used to abut against the primary winding and the secondary winding respectively to maintain the predetermined interval.

3. The multi-duct transformer as described in claim 2, characterized in that, The insulating support members are provided in multiple ways, and the multiple insulating support members are distributed at intervals along the circumference of the primary winding.

4. The multi-duct transformer as described in claim 1, characterized in that, The width of the first heat dissipation duct is between 0.5mm and 3mm, and the width of the second heat dissipation duct is between 1mm and 5mm.

5. The multi-duct transformer as described in claim 1, characterized in that, The magnetic core is an E-type magnetic core.

6. The multi-duct transformer as described in claim 1 or 4, characterized in that, The width of each magnetic core is D, and the width of the first heat dissipation duct is d, where D ≥ 5d.

7. The multi-duct transformer of claim 1 or 5, wherein, The number of magnetic cores provided shall be no less than two and no more than ten.

8. The multi-duct transformer of any one of claims 1 to 5, wherein, The magnetic core assembly also includes an insulating thermally conductive component disposed between any two adjacent magnetic cores. The insulating thermally conductive component is bonded and fixed to the magnetic cores located on both sides thereon, and the thermal conductivity of the insulating thermally conductive component is not less than 1 W / (m·K).

9. The multi-duct transformer of claim 8, wherein, The insulating thermally conductive component is made of silicone, and its thermal conductivity is between 2.5 W / (m·K) and 5 W / (m·K).

10. The multi-duct transformer of claim 8, wherein, The insulating heat-conducting component is in the form of a block. The portion of the insulating heat-conducting component that does not overlap with the second heat-conducting channel in the first heat-conducting channel is distributed in an array. The cross-sectional area of ​​the first heat-conducting channel between two adjacent magnetic cores is S. The sum of the cross-sectional areas of all the insulating heat-conducting components located between the two magnetic cores is P. 0.05S≤P≤0.4S.

11. The multi-duct transformer as described in claim 8, characterized in that, The insulating heat-conducting element is elongated and configured to guide the cooling airflow toward the portion of the second cooling airflow that overlaps with the first cooling airflow.

12. The multi-duct transformer as described in claim 11, characterized in that, The primary winding has a first winding segment located within a first heat dissipation duct, and the secondary winding has a second winding segment located within a second heat dissipation duct. The first winding segment and the corresponding second winding segment form an overlapping duct that coincides with the first heat dissipation duct. The insulating heat-conducting element is arranged at an angle and has an outer end close to the outer surface of the magnetic core and an inner end away from the outer surface of the magnetic core. At least one set of the insulating heat-conducting element is provided. One set of the insulating heat-conducting element includes an insulating heat-conducting element whose inner end extends to the first winding segment and an insulating heat-conducting element whose inner end extends to the second winding segment. The two insulating heat-conducting elements in one set are inclined in opposite directions.

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