Planar transformer

Abstract

The invention discloses a planar transformer. The planar transformer comprises a magnetic core, a plurality of primary windings and a plurality of secondary windings. The magnetic core is provided with an accommodating groove; the multiple primary windings and the multiple secondary windings are arranged in the containing grooves and are arranged in the height direction of the magnetic core in a spaced mode, one secondary winding is arranged between any two adjacent primary windings, one primary winding is arranged between any two adjacent secondary windings, and the multiple primary windings and the multiple secondary windings are arranged in the height direction of the magnetic core in a spaced mode. The multiple primary windings and the multiple secondary windings are overlapped and abut against each other, the primary windings and the secondary windings are insulated, the multiple primary windings are arranged in parallel, and the multiple secondary windings are arranged in parallel. The space utilization rate of the magnetic core window can be improved, so that the power density of the transformer can be improved.

Description

Technical Field

[0001] The present application relates to the field of transformers, and in particular to a planar transformer. Background Art

[0002] In the related art, traditional transformers form primary and secondary windings by winding enameled wire on a magnetic core. However, since irregular gaps are easily generated in the enameled wire during the winding process, the enameled wire cannot be tightly arranged in the core window, resulting in the core window area not being fully utilized, thereby reducing the space utilization of the core window and limiting the overall power density of the transformer. Summary of the Invention

[0003] In order to improve the space utilization of the magnetic core window and increase the overall power density of the transformer, the present application provides a planar transformer.

[0004] The present application provides a planar transformer that adopts the following technical solution: A planar transformer includes a magnetic core provided with a receiving groove.

[0005] Multiple primary windings and multiple secondary windings, multiple primary windings and multiple secondary windings are all arranged in the accommodating groove, multiple primary windings and multiple secondary windings are all spaced apart along the height direction of the magnetic core, one secondary winding is provided between any two adjacent primary windings, and one primary winding is provided between any two adjacent secondary windings. Along the height direction of the magnetic core, multiple primary windings and multiple secondary windings are overlapped and abutted, the primary windings and the secondary windings are insulated, multiple primary windings are arranged in parallel, and multiple secondary windings are arranged in parallel.

[0006] By adopting the above technical solution, a magnetic field is formed when the primary winding is energized, and the magnetic field in the magnetic core sequentially passes through multiple secondary windings adjacent to the primary winding. The multiple secondary windings sense changes in magnetic flux and output current. Furthermore, by closely fitting the primary and secondary windings, gaps or voids in the core window area are avoided. Compared with the existing technology, this application can improve the space utilization of the core window, thereby increasing the power density of the transformer.

[0007] Preferably, the magnetic core includes a first magnet and a second magnet, the first magnet and the second magnet are connected and matched, the first magnet is provided with a first slot body, the second magnet is provided with a second slot body, the first slot body is opposite to and connected to the second slot body to form the accommodating slot, the primary winding is limited and matched with the first magnet and the second magnet, the secondary winding is limited and matched with the first magnet and the second magnet, the bottom wall of the first slot body is provided with a first magnetic column, the bottom wall of the second slot body is provided with a second magnetic column, the first magnetic column and the second magnetic column are opposite and stop-matched, the first magnetic column and / or the second magnetic column pass through multiple primary windings, and the first magnetic column and / or the second magnetic column pass through multiple secondary windings.

[0008] By adopting the above technical solution, a closed magnetic circuit is formed by the first magnetic column and the second magnetic column, so that multiple secondary windings can efficiently sense magnetic flux changes and output current, and by the close fit between the primary winding and the secondary winding, the space utilization of the magnetic core window can be improved and the magnetic coupling efficiency between the primary winding and the secondary winding can be enhanced.

[0009] Preferably, the primary winding is provided with a first avoidance hole, the secondary winding is provided with a second avoidance hole, the first magnetic column and / or the second magnetic column passes through the first avoidance hole, and the first magnetic column and / or the second magnetic column passes through the second avoidance hole.

[0010] By adopting the above technical solution, the first avoidance hole cooperates with the second avoidance hole and the magnetic column, so that the magnetic flux forms a stable and continuous closed path in the magnetic core and acts on multiple secondary windings in turn, thereby enhancing the magnetic coupling effect between the primary winding and multiple secondary windings, and further improving the concentration and continuity of the magnetic flux transfer.

[0011] Preferably, the side wall of the first slot body is provided with a first limiting groove, the side wall of the second slot body is provided with a second limiting groove, and the outer peripheral wall of the primary winding is provided with a limiting portion, and the limiting portion is limitedly matched with the first limiting groove or the second limiting groove.

[0012] By adopting the above technical solution, the limiting portion cooperates with the first limiting groove or the second limiting groove, the installation position of the primary winding in the magnetic core is stable and does not shift, the primary winding and the secondary winding maintain a tight fit, avoiding the appearance of gaps in the accommodating groove, and ensuring that the magnetic flux is stably and continuously transmitted along the closed magnetic circuit of the first magnetic column and the second magnetic column.

[0013] Preferably, the primary winding is constructed as a circuit board, which includes a first substrate and a first coil, the first coil is etched on the first substrate, the first magnetic column and / or the second magnetic column passes through the first substrate, and the first coil is wound around the outside of the first magnetic column and the outside of the second magnetic column.

[0014] By adopting the above technical solution, the first coil is wound around the outside of the first magnetic column and the outside of the second magnetic column to make the magnetic flux distribution more uniform, thereby enhancing the concentration and continuity of the magnetic flux transfer, and further improving the inductive efficiency and output capacity of multiple secondary windings, thereby improving the electromagnetic coupling performance of the planar transformer.

[0015] Preferably, the secondary winding is constructed as a plate, which includes a second substrate and a second coil, the second coil is etched on the second substrate, the first magnetic column and / or the second magnetic column passes through the second substrate, the second coil is wound around the outside of the first magnetic column and the outside of the second magnetic column, and an insulating film is attached to the end wall of the plate adjacent to the primary winding.

[0016] By adopting the above technical solution, the second coil is wound around the outside of the first magnetic column and the outside of the second magnetic column, so that the second coil is in the enclosed area of ​​the main magnetic flux path of the magnetic core, thereby increasing the coupling area between the second coil and the magnetic flux, thereby enhancing the induction capability of the secondary winding and reducing the leakage magnetic phenomenon, thereby improving the output performance and power density of the planar transformer.

[0017] Preferably, there are a plurality of the plate members, and the plurality of the plate members are arranged in sequence along the height direction of the magnetic core, and an insulating film is attached to the end wall of the plate member adjacent to another plate member.

[0018] By adopting the above technical solution, multiple boards jointly participate in the current output, thereby meeting the excessive current output requirements of the planar transformer in high-power application scenarios, and further improving the current carrying capacity and output stability of the planar transformer.

[0019] Preferably, the primary winding is provided with a first connection hole and a second connection hole, the first conductive member passes through a plurality of the first connection holes, the first conductive member is electrically connected to the first connection hole, the second conductive member passes through a plurality of the second connection holes, and the second conductive member is electrically connected to the second connection hole.

[0020] By adopting the above technical solution, multiple primary windings are connected in parallel to share the current load, thereby achieving current diversion among multiple primary windings, thereby reducing the current density of a single primary winding and reducing the heat generated by the primary winding, thereby improving the output stability and service life of the planar transformer.

[0021] Preferably, the secondary winding is provided with a third connection hole, a fourth connection hole and a fifth connection hole, the third conductive member passes through a plurality of the third connection holes, and the third conductive member is electrically connected to the third connection hole, the fourth conductive member passes through a plurality of the fourth connection holes, and the fourth conductive member is electrically connected to the fourth connection hole, and the fifth conductive member passes through a plurality of the fifth connection holes, and the fifth conductive member is electrically connected to the fifth connection hole.

[0022] By adopting the above technical solution, multiple secondary windings are electrically connected into a parallel structure through the third conductive member, the fourth conductive member and the fifth conductive member, so that the induced currents generated by the multiple secondary windings are converged and output, thereby increasing the total conductive cross-sectional area of ​​the secondary loop and reducing the resistance loss during current transmission, thereby improving the current carrying capacity and output stability of the planar transformer under high current output conditions.

[0023] Preferably, the planar transformer further comprises: a heat dissipation shell, the heat dissipation shell is sleeved on the outside of the magnetic core, a heat conductive part is attached to the outer peripheral wall of the magnetic core, the heat conductive part is abutted against the heat dissipation shell, and the heat conductive part and the heat dissipation shell are suitable for heat transfer.

[0024] By adopting the above technical solution, the heat generated by the magnetic core is transferred to the heat dissipation housing through the heat conductive member, so that the heat dissipation housing releases the heat to the external environment in a timely manner, thereby reducing the temperature rise risk of the magnetic core during operation, and further improving the thermal stability and continuous working capability of the planar transformer under high-power and high-load conditions.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. A magnetic field is formed by energizing the primary winding, and the magnetic field in the magnetic core sequentially passes through multiple secondary windings adjacent to the primary winding. The multiple secondary windings sense the change in magnetic flux and output current. By closely fitting the primary and secondary windings, gaps or voids in the core window area are avoided. Compared with the existing technology, this application can improve the space utilization of the core window, thereby increasing the power density of the transformer. 2. Multiple secondary windings are electrically connected in parallel via the third, fourth, and fifth conductive members, so that the induced currents generated by the multiple secondary windings converge and output, thereby increasing the total conductive cross-sectional area of ​​the secondary loop and reducing the resistance loss during current transmission. This can further improve the current carrying capacity and output stability of the planar transformer under high-current output conditions. 3. The heat generated by the magnetic core is transferred to the heat dissipation housing through the thermal conductive member, so that the heat dissipation housing can release the heat to the external environment in a timely manner, thereby reducing the temperature rise risk of the magnetic core during operation, and further improving the thermal stability and continuous working ability of the planar transformer under high power and high load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a planar transformer according to an embodiment of the present application; Figure 2 is a cross-sectional view of a planar transformer according to an embodiment of the present application; Figure 3 is a cross-sectional view from another angle of the planar transformer according to an embodiment of the present application; Figure 4 is a cross-sectional view from another angle of the planar transformer according to an embodiment of the present application; Figure 5 is a cross-sectional view from another angle of the planar transformer according to an embodiment of the present application; Figure 6 yes Figure 5 A magnified schematic diagram of point A in the middle; Figure 7 is a schematic diagram of a partial structure of a secondary winding according to an embodiment of the present application; Figure 8 yes Figure 7 Enlarged schematic diagram of point B in the middle.

[0027] Description of reference numerals: 100. Planar transformer; 1. Magnetic core; 11. Accommodating slot; 12. First magnet; 121. First slot; 1211. First limiting slot; 122. First magnetic column; 13. Second magnet; 131. Second slot; 1311. Second limiting slot; 132. Second magnetic column; 14. Heat conducting member; 2. Primary winding; 21. First avoidance hole; 22. Position limiting portion; 23. First substrate; 24. First connection hole; 25. Second connection hole; 26. First conductive member; 27. Second conductive member; 3. Secondary winding; 31. Second avoidance hole; 32. Second substrate; 33. Insulating film; 34. Third connecting hole; 35. Fourth connecting hole; 36. Fifth connecting hole; 37. Third conductive member; 38. Fourth conductive member; 39. Fifth conductive member; 4. Heat dissipation housing. DETAILED DESCRIPTION

[0028] The following is combined with Figures 1-8 This application is described in further detail.

[0029] The embodiment of the present application discloses a planar transformer 100 .

[0030] Reference Figure 1 、 Figure 2 and Figure 5According to an embodiment of the present application, the planar transformer 100 includes: a magnetic core 1, a plurality of primary windings 2 and a plurality of secondary windings 3.

[0031] The magnetic core 1 is provided with a receiving groove 11, and the multiple primary windings 2 and the multiple secondary windings 3 are all arranged in the receiving groove 11. The multiple primary windings 2 and the multiple secondary windings 3 are spaced apart along the height direction of the magnetic core 1. The height direction of the magnetic core 1 can refer to Figure 2 In the up and down directions, there is a secondary winding 3 between any two adjacent primary windings 2, and there is a primary winding 2 between any two adjacent secondary windings 3, and along the height direction of the magnetic core 1, multiple primary windings 2 and multiple secondary windings 3 are overlapped and abutted, that is, the primary windings 2 and the secondary windings 3 are alternately overlapped in sequence.

[0032] It should be noted that the shape of the magnetic core 1 is rectangular. Along the height direction of the magnetic core 1, the accommodating groove 11 is located between the upper end wall of the magnetic core 1 and the lower end wall of the magnetic core 1. The window of the magnetic core 1 is the area between the upper end wall and the lower end wall of the accommodating groove 11. The shape of the primary winding 2 and the shape of the secondary winding 3 are both flat.

[0033] Furthermore, the primary winding 2 and the secondary winding 3 are insulated from each other, a plurality of primary windings 2 are arranged in parallel, and a plurality of secondary windings 3 are arranged in parallel.

[0034] When the primary winding 2 is energized, the primary winding 2 forms a magnetic field, and the magnetic field in the magnetic core 1 passes through the secondary winding 3 adjacent to the primary winding 2. Along the height direction of the magnetic core 1, multiple secondary windings 3 continuously induce magnetic flux changes, and multiple secondary windings 3 generate and output current. In addition, the primary winding 2 and the secondary winding 3 are tightly fitted to avoid gaps or voids in the window area of ​​the magnetic core 1, thereby improving the space utilization of the window of the magnetic core 1.

[0035] Thus, a magnetic field is formed by energizing the primary winding 2, and the magnetic field in the magnetic core 1 sequentially passes through the multiple secondary windings 3 adjacent to the primary winding 2. The multiple secondary windings 3 sense the change in magnetic flux and output current. Moreover, by closely fitting the primary winding 2 and the secondary winding 3, gaps or voids are avoided in the window area of ​​the magnetic core 1. Compared with the prior art, the present application can improve the space utilization of the window of the magnetic core 1, thereby improving the power density of the transformer.

[0036] Reference Figure 1 、 Figure 2 and Figure 5In some embodiments of the present application, the magnetic core 1 includes a first magnet 12 and a second magnet 13, which are connected and matched. The first magnet 12 is provided with a first slot 121, and the second magnet 13 is provided with a second slot 131. The first slot 121 and the second slot 131 are opposite to and connected to form a receiving slot 11. Specifically, along the height direction of the magnetic core 1, the first magnet 12 is located above the second magnet 13, and the first slot 121 is located above the second slot 131. The first magnet 12 and the second magnet 13 are connected and matched to form the magnetic core 1, and the first slot 121 and the second slot 131 are both constructed as through slots.

[0037] In addition, a first magnetic column 122 is provided on the bottom wall of the first slot body 121, and a second magnetic column 132 is provided on the bottom wall of the second slot body 131. The first magnetic column 122 and the second magnetic column 132 are opposite to each other and stop-fit. Specifically, after the first magnet 12 and the second magnet 13 are connected and matched to form the magnetic core 1, the first magnetic column 122 and the second magnetic column 132 stop-fit. The first magnetic column 122 and / or the second magnetic column 132 pass through multiple primary windings 2, and the first magnetic column 122 and / or the second magnetic column 132 pass through multiple secondary windings 3. The primary windings Group 2 is limited and matched with the first magnet 12 and the second magnet 13, and the secondary winding 3 is limited and matched with the first magnet 12 and the second magnet 13. Specifically, the primary winding 2 is limited and matched with the first magnetic column 122 or the second magnetic column 132, and the primary winding 2 is limited and matched with the inner wall of the first slot body 121 and the inner wall of the second slot body 131, the secondary winding 3 is limited and matched with the first magnetic column 122 or the second magnetic column 132, and the secondary winding 3 is limited and matched with the inner wall of the first slot body 121 and the inner wall of the second slot body 131.

[0038] In some specific embodiments, the first magnetic column 122 passes through a portion of the primary windings 2 among the plurality of primary windings 2 , and the second magnetic column 132 passes through another portion of the primary windings 2 among the plurality of primary windings 2 .

[0039] In some specific embodiments, the first magnetic column 122 passes through a portion of the secondary windings 3 among the plurality of secondary windings 3 , and the second magnetic column 132 passes through another portion of the secondary windings 3 among the plurality of secondary windings 3 .

[0040] When the primary winding 2 is energized, the magnetic field in the magnetic core 1 is continuously transmitted to multiple secondary windings 3 along the closed magnetic circuit formed by the first magnetic column 122 and the second magnetic column 132. The multiple secondary windings 3 sense the magnetic flux changes and output current. The primary winding 2 and the secondary winding 3 are tightly fitted to avoid gaps in the accommodating slot 11. The magnetic flux path is concentrated and the coupling area is continuous.

[0041] A closed magnetic circuit is formed by the first magnetic column 122 and the second magnetic column 132, so that multiple secondary windings 3 can efficiently sense magnetic flux changes and output current, and the primary winding 2 and the secondary winding 3 are tightly fitted together, thereby improving the space utilization of the magnetic core 1 window and enhancing the magnetic coupling efficiency between the primary winding 2 and the secondary winding 3.

[0042] Reference Figure 2 、 Figure 3 and Figure 7 In some embodiments of the present application, the primary winding 2 is provided with a first avoidance hole 21, and the secondary winding 3 is provided with a second avoidance hole 31. The first avoidance hole 21 and the second avoidance hole 31 are both constructed as through holes, and the first magnetic column 122 and / or the second magnetic column 132 pass through the first avoidance hole 21, and the first magnetic column 122 and / or the second magnetic column 132 pass through the second avoidance hole 31.

[0043] In some specific embodiments, the first magnetic pillars 122 pass through some of the plurality of first avoidance holes 21 , and the second magnetic pillars 132 pass through another portion of the plurality of first avoidance holes 21 .

[0044] In some specific embodiments, the first magnetic pillars 122 pass through some of the plurality of second avoidance holes 31 , and the second magnetic pillars 132 pass through another portion of the plurality of second avoidance holes 31 .

[0045] The first magnetic column 122 and / or the second magnetic column 132 pass through the first avoidance hole 21 and the second avoidance hole 31, so that the first magnetic column 122 and the second magnetic column 132 pass through multiple primary windings 2 and multiple secondary windings 3. After the primary winding 2 is energized, the magnetic field propagates along the closed magnetic circuit formed by the first magnetic column 122 and the second magnetic column 132 and continuously passes through the multiple secondary windings 3. The multiple secondary windings 3 induce magnetic flux changes to generate and output current.

[0046] By cooperating with the first avoidance hole 21, the second avoidance hole 31 and the magnetic column, the magnetic flux forms a stable and continuous closed path in the magnetic core 1 and acts on multiple secondary windings 3 in sequence, thereby enhancing the magnetic coupling effect between the primary winding 2 and the multiple secondary windings 3, and further improving the concentration and continuity of the magnetic flux transfer.

[0047] It should be noted that designers can adjust the number of turns of the first coil according to the voltage transformation requirements of the transformer.

[0048] Reference Figure 3 and Figure 4In some embodiments of the present application, the side wall of the first slot body 121 is provided with a first limiting groove 1211, the side wall of the second slot body 131 is provided with a second limiting groove 1311, and the outer peripheral wall of the primary winding 2 is provided with a limiting portion 22. Specifically, along the first direction of the magnetic core 1, the first direction of the magnetic core 1 can refer to Figure 3 In the left and right directions, the left side wall of the first slot body 121 is provided with a first limiting groove 1211, the left side wall of the second slot body 131 is provided with a second limiting groove 1311, and the left side wall of the primary winding 2 is provided with a limiting portion 22.

[0049] In some specific embodiments, a first limiting groove 1211 is provided on the right side wall of the first slot body 121 , a second limiting groove 1311 is provided on the right side wall of the second slot body 131 , and a limiting portion 22 is provided on the right side wall of the primary winding 2 .

[0050] In some specific embodiments, the left and right walls of the first slot body 121 are both provided with a first limiting groove 1211, the left and right walls of the second slot body 131 are both provided with a second limiting groove 1311, and the left and right walls of the primary winding 2 are both provided with a limiting portion 22.

[0051] In addition, the limiting portion 22 is limited and cooperated with the first limiting groove 1211 or the second limiting groove 1311. When the primary winding 2 is installed in the accommodating groove 11, the limiting portion 22 extends into the first limiting groove 1211 or the second limiting groove 1311. The limiting portion 22 is limited and cooperated with the first limiting groove 1211 or the second limiting groove 1311. The installation position of the primary winding 2 in the magnetic core 1 is stable and does not shift. The primary winding 2 and the secondary winding 3 maintain a tight fit, avoiding the appearance of gaps in the accommodating groove 11, and ensuring that the magnetic flux is stably and continuously transmitted along the closed magnetic circuit of the first magnetic column 122 and the second magnetic column 132.

[0052] Reference Figure 1 、 Figure 2 and Figure 5 In some embodiments of the present application, the primary winding 2 is constructed as a circuit board, which includes a first substrate 23 and a first coil. The first coil is etched on the first substrate 23, and the first magnetic column 122 and / or the second magnetic column 132 pass through the first substrate 23. The first coil is wound around the outside of the first magnetic column 122 and the outside of the second magnetic column 132. That is, the first magnetic column 122 and the second magnetic column 132 are located at the center of the first coil.

[0053] In some specific embodiments, the first magnetic pillars 122 pass through a portion of the first substrates 23 among the plurality of first substrates 23 , and the second magnetic pillars 132 pass through another portion of the first substrates 23 among the plurality of first substrates 23 .

[0054] It should be noted that the first coil is connected to an external power supply.

[0055] The first magnetic column 122 and / or the second magnetic column 132 pass through the first substrate 23 so that the first substrate 23 is fixedly installed in the receiving groove 11 of the magnetic core 1. When the first coil is energized, the current forms a magnetic field in the first coil. The magnetic field in the magnetic core 1 passes through the multiple secondary windings 3 areas along the magnetic circuit formed between the first magnetic column 122 and the second magnetic column 132. The multiple secondary windings 3 sense the magnetic flux changes and output current.

[0056] By winding the first coil around the outside of the first magnetic column 122 and the outside of the second magnetic column 132, the magnetic flux distribution is made more uniform, thereby enhancing the concentration and continuity of the magnetic flux transfer, and further improving the induction efficiency and output capacity of the multiple secondary windings 3, thereby improving the electromagnetic coupling performance of the planar transformer 100.

[0057] It should be noted that designers can adjust the number of turns of the first coil according to the voltage transformation requirements of the transformer.

[0058] Reference Figure 2 、 Figure 5 and Figure 6 In some embodiments of the present application, the secondary winding 3 is constructed as a plate, which includes a second substrate 32 and a second coil. The second coil is etched on the second substrate 32. The first magnetic column 122 and / or the second magnetic column 132 pass through the second substrate 32. The second coil is wound around the outside of the first magnetic column 122 and the outside of the second magnetic column 132. That is, the first magnetic column 122 and the second magnetic column 132 are located at the center of the second coil, and an insulating film 33 is attached to the end wall of the plate adjacent to the primary winding 2.

[0059] In some specific embodiments, the first magnetic pillars 122 pass through a portion of the second substrates 32 in the plurality of second substrates 32 , and the second magnetic pillars 132 pass through another portion of the second substrates 32 in the plurality of second substrates 32 .

[0060] It should be noted that the second coil is connected to an external electrical device.

[0061] The first magnetic column 122 and / or the second magnetic column 132 passes through the second substrate 32, so that the second substrate 32 is fixed in the receiving groove 11 of the magnetic core 1. When the primary winding 2 is energized, a magnetic field is formed in the magnetic core 1. The magnetic flux propagates along the path between the first magnetic column 122 and the second magnetic column 132 and passes through the second coil. The second coil induces the change in magnetic flux to generate current. An insulating film 33 is attached to the end wall adjacent to the plate and the primary winding 2 to achieve electrical isolation.

[0062] By winding the second coil around the outside of the first magnetic column 122 and the outside of the second magnetic column 132, the second coil is located in the enclosed area of ​​the main magnetic flux path of the magnetic core 1, thereby increasing the coupling area between the second coil and the magnetic flux, thereby enhancing the induction capability of the secondary winding 3 and reducing magnetic leakage, thereby improving the output performance and power density of the planar transformer 100.

[0063] It should be noted that designers can adjust the number of turns of the second coil according to the voltage transformation requirements of the transformer.

[0064] Reference Figure 2 、 Figure 5 and Figure 6 In some embodiments of the present application, there are multiple plates, and the multiple plates are arranged in sequence along the height direction of the magnetic core 1. Specifically, the multiple plates are overlapped in sequence, and the end wall adjacent to the plate is provided with an insulating film 33, that is, an insulating film 33 is sandwiched between two adjacent plates.

[0065] By setting up multiple plates, the overall copper cross-sectional area of ​​the secondary winding 3 can be increased, and multiple plates jointly participate in the current output, thereby meeting the excessive current output requirements of the planar transformer 100 in high-power application scenarios, and thus improving the current carrying capacity and output stability of the planar transformer 100.

[0066] Reference Figure 1 and Figure 5 In some embodiments of the present application, the primary winding 2 is provided with a first connection hole 24 and a second connection hole 25, the first conductive member 26 passes through a plurality of first connection holes 24, the first conductive member 26 is electrically connected to the first connection holes 24, and the second conductive member 27 passes through a plurality of second connection holes 25, the second conductive member 27 is electrically connected to the second connection holes 25.

[0067] It should be noted that the first conductive member 26 and the second conductive member 27 are both electrically connected to an external power source.

[0068] The first conductive member 26 and the second conductive member 27 form an electrical connection path between the multiple primary windings 2, so that the multiple primary windings 2 are in a parallel state. When powered on, the multiple primary windings 2 jointly bear the current load to achieve current diversion. The multiple primary windings 2 are staggered along the height direction of the magnetic core 1 and tightly fit with the multiple secondary windings 3. The multiple secondary windings 3 sense magnetic flux changes and output current.

[0069] By connecting multiple primary windings 2 in parallel to share the current load, the current can be diverted between the multiple primary windings 2, thereby reducing the current density of a single primary winding 2 and the heat generated by the primary winding 2, thereby improving the output stability and service life of the planar transformer 100.

[0070] Reference Figure 1 、 Figure 5 、 Figure 7 and Figure 8 In some embodiments of the present application, the secondary winding 3 is provided with a third connection hole 34, a fourth connection hole 35 and a fifth connection hole 36, the third conductive member 37 passes through multiple third connection holes 34, and the third conductive member 37 is electrically connected to the third connection hole 34, the fourth conductive member 38 passes through multiple fourth connection holes 35, and the fourth conductive member 38 is electrically connected to the fourth connection hole 35, the fifth conductive member 39 passes through multiple fifth connection holes 36, and the fifth conductive member 39 is electrically connected to the fifth connection hole 36.

[0071] The third conductive member 37, the fourth conductive member 38 and the fifth conductive member 39 respectively electrically connect the multiple secondary windings 3 into a parallel structure. The multiple secondary windings 3 are arranged in sequence in the height direction of the magnetic core 1 and are staggered with the multiple primary windings 2. The multiple secondary windings 3 induce magnetic flux changes and generate output currents. The third conductive member 37, the fourth conductive member 38 and the fifth conductive member 39 connect the induced currents of the multiple secondary windings 3 in parallel.

[0072] The multiple secondary windings 3 are electrically connected into a parallel structure through the third conductive member 37, the fourth conductive member 38 and the fifth conductive member 39, so that the induced currents generated by the multiple secondary windings 3 are converged and output, thereby increasing the total conductive cross-sectional area of ​​the secondary loop and reducing the resistance loss during current transmission, thereby improving the current carrying capacity and output stability of the planar transformer 100 under high current output conditions.

[0073] Reference Figure 1 and Figure 2 In some embodiments of the present application, the planar transformer 100 further includes: a heat dissipation shell 4, which is sleeved on the outside of the magnetic core 1, and a heat conductive member 14 is attached to the outer peripheral wall of the magnetic core 1, and the heat conductive member 14 is abutted against the heat dissipation shell 4, and the heat conductive member 14 and the heat dissipation shell 4 are suitable for heat transfer.

[0074] The heat conductor 14 conducts the heat generated by the magnetic core 1 during operation to the heat dissipation housing 4, and the heat dissipation housing 4 releases the heat to the external environment through convection or radiation, so that the temperature of the magnetic core 1 can be controlled within a safe range, thereby achieving rapid heat diffusion and the planar transformer 100 is in a stable heat dissipation state.

[0075] The heat generated by the magnetic core 1 is conducted to the heat dissipation shell 4 through the heat conductive member 14, so that the heat dissipation shell 4 releases the heat to the external environment in a timely manner, thereby reducing the temperature rise risk of the magnetic core 1 during operation, and further improving the thermal stability and continuous working capability of the planar transformer 100 under high power and high load conditions.

[0076] In some specific embodiments, the heat conducting member 14 may be a heat conducting silicone pad.

[0077] In some specific embodiments, the heat dissipation housing 4 is made of aluminum alloy.

[0078] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A planar transformer, characterized in that: include: A magnetic core (1), wherein the magnetic core (1) is provided with a receiving groove (11); A plurality of primary windings (2) and a plurality of secondary windings (3), wherein the plurality of primary windings (2) and the plurality of secondary windings (3) are all arranged in the accommodating groove (11), the plurality of primary windings (2) and the plurality of secondary windings (3) are all arranged spaced apart along the height direction of the magnetic core (1), one secondary winding (3) is provided between any two adjacent primary windings (2), and one primary winding (2) is provided between any two adjacent secondary windings (3), along the height direction of the magnetic core (1), the plurality of primary windings (2) and the plurality of secondary windings (3) are all overlapped and abutted, the primary windings (2) and the secondary windings (3) are insulated, the plurality of primary windings (2) are arranged in parallel, and the plurality of secondary windings (3) are arranged in parallel.

2. A planar transformer according to claim 1, characterized in that: The magnetic core (1) comprises a first magnet (12) and a second magnet (13), the first magnet (12) and the second magnet (13) are connected and matched, the first magnet (12) is provided with a first slot (121), the second magnet (13) is provided with a second slot (131), the first slot (121) and the second slot (131) are opposite and connected to form the accommodating slot (11), the primary winding (2) is limitedly matched with the first magnet (12) and the second magnet (13), and the secondary winding (3) is limitedly matched with the The first magnet (12) and the second magnet (13) are limitedly matched, the bottom wall of the first slot (121) is provided with a first magnetic column (122), the bottom wall of the second slot (131) is provided with a second magnetic column (132), the first magnetic column (122) and the second magnetic column (132) are opposite and stop-matched, the first magnetic column (122) and / or the second magnetic column (132) pass through a plurality of the primary windings (2), and the first magnetic column (122) and / or the second magnetic column (132) pass through a plurality of the secondary windings (3).

3. A planar transformer according to claim 2, characterized in that: The primary winding (2) is provided with a first avoidance hole (21), the secondary winding (3) is provided with a second avoidance hole (31), the first magnetic column (122) and / or the second magnetic column (132) pass through the first avoidance hole (21), and the first magnetic column (122) and / or the second magnetic column (132) pass through the second avoidance hole (31).

4. A planar transformer according to claim 2, characterized in that: The side wall of the first slot body (121) is provided with a first limiting slot (1211), the side wall of the second slot body (131) is provided with a second limiting slot (1311), and the outer peripheral wall of the primary winding (2) is provided with a limiting portion (22), and the limiting portion (22) is limitedly matched with the first limiting slot (1211) or the second limiting slot (1311).

5. The planar transformer according to claim 2, characterized in that: The primary winding (2) is constructed as a circuit board, comprising a first substrate (23) and a first coil, wherein the first coil is etched on the first substrate (23), the first magnetic column (122) and / or the second magnetic column (132) pass through the first substrate (23), and the first coil is wound around the outside of the first magnetic column (122) and the outside of the second magnetic column (132).

6. The planar transformer according to claim 2, characterized in that: The secondary winding (3) is constructed as a plate member, comprising a second substrate (32) and a second coil, wherein the second coil is etched on the second substrate (32), the first magnetic column (122) and / or the second magnetic column (132) pass through the second substrate (32), the second coil is wound around the outside of the first magnetic column (122) and the outside of the second magnetic column (132), and an insulating film (33) is attached to the end wall of the plate member adjacent to the primary winding (2).

7. The planar transformer according to claim 6, characterized in that: There are a plurality of plate members, and the plurality of plate members are arranged in sequence along the height direction of the magnetic core (1). An insulating film (33) is attached to an end wall of a plate member adjacent to another plate member.

8. The planar transformer according to claim 1, characterized in that: The primary winding (2) is provided with a first connection hole (24) and a second connection hole (25); a first conductive member (26) passes through a plurality of the first connection holes (24); the first conductive member (26) is electrically connected to the first connection hole (24); a second conductive member (27) passes through a plurality of the second connection holes (25); the second conductive member (27) is electrically connected to the second connection hole (25).

9. The planar transformer according to claim 1, characterized in that: The secondary winding (3) is provided with a third connection hole (34), a fourth connection hole (35) and a fifth connection hole (36); a third conductive member (37) passes through a plurality of the third connection holes (34); the third conductive member (37) is electrically connected to the third connection hole (34); a fourth conductive member (38) passes through a plurality of the fourth connection holes (35); the fourth conductive member (38) is electrically connected to the fourth connection hole (35); a fifth conductive member (39) passes through a plurality of the fifth connection holes (36); the fifth conductive member (39) is electrically connected to the fifth connection hole (36).

10. The planar transformer according to claim 1, characterized in that: Also includes: A heat dissipation shell (4) is sleeved on the outer side of the magnetic core (1); a heat conducting member (14) is attached to the outer peripheral wall of the magnetic core (1); the heat conducting member (14) and the heat dissipation shell (4) are in abutment engagement with each other; and the heat conducting member (14) and the heat dissipation shell (4) are suitable for heat transfer.

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