Planar transformer

Abstract

The application discloses a planar transformer, which comprises a magnetic core, a plurality of primary windings and a plurality of secondary windings. The magnetic core is provided with a receiving groove; the plurality of primary windings and the plurality of secondary windings are arranged in the receiving groove, the plurality of primary windings and the plurality of secondary windings are arranged at intervals along the height direction of the magnetic core, one secondary winding is arranged between any two adjacent primary windings, one primary winding is arranged between any two adjacent secondary windings, the plurality of primary windings and the plurality of secondary windings are arranged in overlap and abutment along the height direction of the magnetic core, the primary windings and the secondary windings are arranged in insulation, the plurality of primary windings are arranged in parallel, and the plurality of secondary windings are arranged in parallel. The application can improve the space utilization of the magnetic core window, thereby improving the power density of the transformer.

Description

TECHNICAL FIELD

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

[0002] In the related art, a traditional transformer forms a primary winding and a secondary winding by winding enameled wire on a magnetic core. However, due to the irregular gaps that are likely to occur in the winding process of the enameled wire, the enameled wire cannot be closely arranged in the magnetic core window, so that the magnetic core window area is not fully utilized, thereby reducing the space utilization of the magnetic core window and limiting the overall power density of the transformer. SUMMARY

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

[0004] The planar transformer provided by the present application adopts the following technical solution:

[0005] A planar transformer comprises a magnetic core provided with a receiving groove.

[0006] A plurality of primary windings and a plurality of secondary windings are arranged in the receiving groove. The plurality of primary windings and the plurality of secondary windings are arranged in the height direction of the magnetic core. Any two adjacent primary windings are provided with a secondary winding therebetween, and any two adjacent secondary windings are provided with a primary winding therebetween. The plurality of primary windings and the plurality of secondary windings are arranged in overlapping and abutting relationship in the height direction of the magnetic core. The primary windings and the secondary windings are insulated from each other. The plurality of primary windings are arranged in parallel, and the plurality of secondary windings are arranged in parallel.

[0007] By adopting the above technical solution, a magnetic field is formed after the primary winding is energized, and the magnetic field in the magnetic core sequentially passes through the plurality of secondary windings adjacent to the primary winding. The plurality of secondary windings induce the change of magnetic flux and output current. By closely abutting the primary windings and the secondary windings, gaps or voids in the magnetic core window area are avoided. Compared with the prior art, the present application can improve the space utilization of the magnetic core window, thereby improving the power density of the transformer.

[0008] Preferably, the magnetic core comprises 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 groove body, the second magnet is provided with a second groove body, the first groove body and the second groove body are opposite and communicated to form the accommodating groove, 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 groove body is provided with a first magnetic column, the bottom wall of the second groove body is provided with a second magnetic column, the first magnetic column and the second magnetic column are opposite and abutting matched, the first magnetic column and / or the second magnetic column passes through a plurality of the primary windings, and the first magnetic column and / or the second magnetic column passes through a plurality of the secondary windings.

[0009] By adopting the above technical scheme, the first magnetic column and the second magnetic column form a closed magnetic circuit, so that the plurality of secondary windings can efficiently induce the change of magnetic flux and output current, and the primary winding and the secondary winding are closely matched, so that 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.

[0010] Preferably, the primary winding is provided with a first avoiding hole, the secondary winding is provided with a second avoiding hole, the first magnetic column and / or the second magnetic column passes through the first avoiding hole, and the first magnetic column and / or the second magnetic column passes through the second avoiding hole.

[0011] By adopting the above technical scheme, the first avoiding hole, the second avoiding hole and the magnetic column are matched, so that the magnetic flux forms a stable and continuous closed path in the magnetic core and acts on the plurality of secondary windings in turn, so that the magnetic coupling effect between the primary winding and the plurality of secondary windings can be enhanced, and then the concentration and continuity of the magnetic flux transmission can be improved.

[0012] Preferably, the side wall of the first groove body is provided with a first limiting groove, the side wall of the second groove body is provided with a second limiting groove, and the outer peripheral wall of the primary winding is provided with a limiting portion, the limiting portion is limited and matched with the first limiting groove or the second limiting groove.

[0013] By adopting the above technical scheme, the limiting portion is limited and matched 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 deviate, the primary winding and the secondary winding remain in a closely matched state, the gap in the accommodating groove is avoided, and the stable and continuous transmission of the magnetic flux along the closed magnetic circuit of the first magnetic column and the second magnetic column is ensured.

[0014] Preferably, the primary winding is configured as a circuit board, the circuit board comprises a first substrate and a first coil, the first coil is etched and formed 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 outside the first magnetic column and outside the second magnetic column.

[0015] By adopting the technical scheme, the first coil is arranged on the outer side of the first magnetic column and the outer side of the second magnetic column, so that the magnetic flux distribution is more uniform, the concentration and continuity of the magnetic flux transmission can be enhanced, the induction efficiency and output capacity of the plurality of secondary windings can be improved, and the electromagnetic coupling performance of the planar transformer can be improved.

[0016] Preferably, the secondary winding is configured as a plate member, the plate member 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 arranged on the outer side of the first magnetic column and the outer side of the second magnetic column, and an insulating film is attached to the end wall adjacent to the primary winding of the plate member.

[0017] By adopting the technical scheme, the second coil is arranged on the outer side of the first magnetic column and the outer side of the second magnetic column, so that the second coil is in the surrounding area of the main magnetic flux path of the magnetic core, the coupling area of the second coil and the magnetic flux can be increased, the induction capacity of the secondary winding can be enhanced and the magnetic leakage phenomenon can be reduced, and the output performance and power density of the planar transformer can be improved.

[0018] Preferably, the plate member is a plurality of plate members, the plurality of plate members are arranged in sequence along the height direction of the magnetic core, and an insulating film is attached to the end wall adjacent to another plate member.

[0019] By adopting the technical scheme, a plurality of plate members jointly participate in current output, so that the excessive current output demand of the planar transformer in a high-power application scenario can be met, and the current-carrying capacity and output stability of the planar transformer can be improved.

[0020] Preferably, the primary winding is provided with a first connecting hole and a second connecting hole, a first conductive member passes through a plurality of the first connecting holes, the first conductive member is electrically connected with the first connecting hole, and a second conductive member passes through a plurality of the second connecting holes, the second conductive member is electrically connected with the second connecting hole.

[0021] By adopting the technical scheme, a plurality of primary windings are in a parallel state to jointly bear current load, so that current can be shunted between a plurality of primary windings, the current density of a single primary winding can be reduced, the heat generation of the primary winding can be reduced, and the output stability and service life of the planar transformer can be improved.

[0022] Preferably, the secondary winding is provided with a third connecting hole, a fourth connecting hole and a fifth connecting hole, a third conductive piece passes through a plurality of the third connecting holes, the third conductive piece is electrically connected with the third connecting hole, a fourth conductive piece passes through a plurality of the fourth connecting holes, the fourth conductive piece is electrically connected with the fourth connecting hole, and a fifth conductive piece passes through a plurality of the fifth connecting holes, the fifth conductive piece is electrically connected with the fifth connecting hole.

[0023] By adopting the above technical scheme, the third conductive piece, the fourth conductive piece and the fifth conductive piece are used to electrically connect the plurality of secondary windings into a parallel structure, so that the induced currents generated by the plurality of secondary windings are converged and output, thereby the total conductive cross-sectional area of the secondary circuit can be increased, the resistance loss in the current transmission process can be reduced, and the current-carrying capacity and output stability of the planar transformer under a large current output working condition can be improved.

[0024] Preferably, the planar transformer further comprises a heat dissipation shell, the heat dissipation shell is sleeved on the outside of the magnetic core, a peripheral wall of the magnetic core is attached with a heat conduction piece, the heat conduction piece is in abutting fit with the heat dissipation shell, and the heat conduction piece and the heat dissipation shell are adapted for heat transfer.

[0025] By adopting the above technical scheme, the heat conduction piece is used to conduct the heat generated by the magnetic core to the heat dissipation shell, so that the heat dissipation shell releases the heat to the external environment in time, thereby the risk of temperature rise of the magnetic core in the running process can be reduced, and the thermal stability and continuous working capacity of the planar transformer under a high power and high load working condition can be improved.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. The magnetic field is formed after the primary winding is energized, and the magnetic field in the magnetic core sequentially passes through a plurality of secondary windings adjacent to the primary winding, the plurality of secondary windings induce the change of magnetic flux and output current, and the primary winding and the secondary winding are closely attached, so that there is no gap or gap in the window area of the magnetic core. Compared with the prior art, the present application can improve the space utilization rate of the magnetic core window, thereby improving the power density of the transformer;

[0028] 2. The third conductive piece, the fourth conductive piece and the fifth conductive piece are used to electrically connect the plurality of secondary windings into a parallel structure, so that the induced currents generated by the plurality of secondary windings are converged and output, thereby the total conductive cross-sectional area of the secondary circuit can be increased, the resistance loss in the current transmission process can be reduced, and the current-carrying capacity and output stability of the planar transformer under a large current output working condition can be improved;

[0029] 3. The heat generated by the magnetic core is conducted to the heat dissipation shell through the heat conduction member, so that the heat dissipation shell releases the heat to the external environment in time, thereby reducing the risk of temperature rise of the magnetic core during operation, and further improving the thermal stability and continuous working capacity of the planar transformer under high-power and high-load working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of a planar transformer according to an embodiment of the present application;

[0031] Figure 2 is a sectional view of a planar transformer according to an embodiment of the present application;

[0032] Figure 3 is a sectional view of a planar transformer according to an embodiment of the present application from another angle;

[0033] Figure 4 is a sectional view of a planar transformer according to an embodiment of the present application from another angle;

[0034] Figure 5 is a sectional view of a planar transformer according to an embodiment of the present application from another angle;

[0035] Figure 6 is Figure 5 is an enlarged schematic view of A in FIG. 1;

[0036] Figure 7 is a schematic view of a partial structure of a secondary winding according to an embodiment of the present application;

[0037] Figure 8 is Figure 7 is an enlarged schematic view of B in FIG. 1.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 100, planar transformer;

[0040] 1, magnetic core; 11, accommodating groove; 12, first magnet; 121, first slot body; 1211, first limiting groove; 122, first magnetic column; 13, second magnet; 131, second slot body; 1311, second limiting groove; 132, second magnetic column; 14, heat conduction member;

[0041] 2, primary winding; 21, first avoiding hole; 22, limiting part; 23, first base plate; 24, first connecting hole; 25, second connecting hole; 26, first conductive member; 27, second conductive member;

[0042] 3, secondary winding; 31, second avoiding hole; 32, second substrate; 33, insulating film; 34, third connecting hole; 35, fourth connecting hole; 36, fifth connecting hole; 37, third conductive piece; 38, fourth conductive piece; 39, fifth conductive piece;

[0043] 4, heat dissipation housing. DETAILED DESCRIPTION

[0044] The following description will be made in conjunction with the accompanying drawings. Figures 1-8 The application is further described in detail.

[0045] The embodiment of the application discloses a planar transformer 100.

[0046] Referring to Figure 1 , Figure 2 and Figure 5 , the planar transformer 100 according to the embodiment of the application comprises a magnetic core 1, a plurality of primary windings 2 and a plurality of secondary windings 3.

[0047] The magnetic core 1 is provided with a receiving groove 11, and the plurality of primary windings 2 and the plurality of secondary windings 3 are arranged in the receiving groove 11. The plurality of primary windings 2 and the plurality of secondary windings 3 are arranged at intervals along the height direction of the magnetic core 1. The height direction of the magnetic core 1 can refer to the up-down direction in Figure 2 , any two adjacent primary windings 2 are provided with a secondary winding 3 therebetween, and any two adjacent secondary windings 3 are provided with a primary winding 2 therebetween. Along the height direction of the magnetic core 1, the plurality of primary windings 2 and the plurality of secondary windings 3 are arranged in overlapping and abutting mode, that is, the primary windings 2 and the secondary windings 3 are arranged in staggered and overlapping mode.

[0048] It should be noted that the shape of the magnetic core 1 is rectangular, and along the height direction of the magnetic core 1, the receiving 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 receiving groove 11. The shape of the primary winding 2 and the shape of the secondary winding 3 are both configured as a flat plate.

[0049] In addition, the primary windings 2 and the secondary windings 3 are arranged in insulating mode. The plurality of primary windings 2 are arranged in parallel mode, and the plurality of secondary windings 3 are arranged in parallel mode.

[0050] When the primary winding 2 is energized, the primary winding 2 forms a magnetic field. 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, the plurality of secondary windings 3 continuously induce the change of magnetic flux. The plurality of secondary windings 3 generate and output current. In addition, the primary winding 2 and the secondary winding 3 are closely attached to avoid the occurrence of 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.

[0051] Thus, a magnetic field is formed after the primary winding 2 is energized, and the magnetic field in the magnetic core 1 sequentially passes through the plurality of secondary windings 3 adjacent to the primary winding 2, the plurality of secondary windings 3 induce magnetic flux changes and output current, and by closely fitting the primary winding 2 and the secondary winding 3, gaps or voids in the window area of the magnetic core 1 are avoided. Compared with the prior art, the space utilization of the window of the magnetic core 1 can be improved, thereby the power density of the transformer can be improved.

[0052] Referring to Figure 1 , Figure 2 and Figure 5 In some embodiments of the present application, the magnetic core 1 includes 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 body 121, the second magnet 13 is provided with a second slot body 131, the first slot body 121 and the second slot body 131 are opposite and communicate to form a containing slot 11, specifically, along the height direction of the magnetic core 1, the first magnet 12 is located above the second magnet 13, the first slot body 121 is located above the second slot body 131, the first magnet 12 and the second magnet 13 are connected and matched to form the magnetic core 1, and the first slot body 121 and the second slot body 131 are both configured as through slots.

[0053] Furthermore, the bottom wall of the first slot body 121 is provided with a first magnetic column 122, the bottom wall of the second slot body 131 is provided with a second magnetic column 132, the first magnetic column 122 and the second magnetic column 132 are opposite and abutted, 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 are abutted, the first magnetic column 122 and / or the second magnetic column 132 pass through the plurality of primary windings 2, the first magnetic column 122 and / or the second magnetic column 132 pass through the plurality of secondary windings 3, the primary winding 2 is limited and matched with the first magnet 12 and the second magnet 13, 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 side wall of the first slot body 121 and the inner side 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 side wall of the first slot body 121 and the inner side wall of the second slot body 131.

[0054] In some specific embodiments, part of the plurality of primary windings 2 is passed through the first magnetic column 122, and another part of the plurality of primary windings 2 is passed through the second magnetic column 132.

[0055] In some specific embodiments, part of the plurality of secondary windings 3 is passed through the first magnetic column 122, and another part of the plurality of secondary windings 3 is passed through the second magnetic column 132.

[0056] When the primary winding 2 is energized, the magnetic field in the magnetic core 1 is continuously transmitted along the closed magnetic path formed by the first magnetic column 122 and the second magnetic column 132 to the plurality of secondary windings 3, the plurality of secondary windings 3 senses the change of the magnetic flux and outputs current, the primary winding 2 and the secondary winding 3 are closely attached to avoid the gap in the accommodation slot 11, the magnetic flux path is concentrated and the coupling area is continuous.

[0057] The closed magnetic path is formed by the first magnetic column 122 and the second magnetic column 132, so that the plurality of secondary windings 3 can efficiently sense the change of the magnetic flux and output current, and by closely attaching the primary winding 2 and the secondary winding 3, the space utilization of the window of the magnetic core 1 can be improved and the magnetic coupling efficiency between the primary winding 2 and the secondary winding 3 can be enhanced.

[0058] Referring to Figure 2 , Figure 3 and Figure 7 , in some embodiments of the present application, the primary winding 2 is provided with a first avoiding hole 21, the secondary winding 3 is provided with a second avoiding hole 31, the first avoiding hole 21 and the second avoiding hole 31 are both configured as through holes, the first magnetic column 122 and / or the second magnetic column 132 passes through the first avoiding hole 21, and the first magnetic column 122 and / or the second magnetic column 132 passes through the second avoiding hole 31.

[0059] In some specific embodiments, part of the plurality of first avoiding holes 21 is passed through by the first magnetic column 122, and another part of the plurality of first avoiding holes 21 is passed through by the second magnetic column 132.

[0060] In some specific embodiments, part of the plurality of second avoiding holes 31 is passed through by the first magnetic column 122, and another part of the plurality of second avoiding holes 31 is passed through by the second magnetic column 132.

[0061] The first magnetic column 122 and / or the second magnetic column 132 passes through the first avoiding hole 21 and the second avoiding hole 31, so that the first magnetic column 122 and the second magnetic column 132 pass through the plurality of primary windings 2 and the plurality of secondary windings 3, and when the primary winding 2 is energized, the magnetic field propagates along the closed magnetic path formed by the first magnetic column 122 and the second magnetic column 132 and continuously passes through the plurality of secondary windings 3, and the plurality of secondary windings 3 senses the change of the magnetic flux and generates and outputs current.

[0062] The first avoiding hole 21 and the second avoiding hole 31 cooperate with the magnetic column to form a stable and continuous closed path of the magnetic flux in the magnetic core 1 and act on the plurality of secondary windings 3 in turn, so that the magnetic coupling effect between the primary winding 2 and the plurality of secondary windings 3 can be enhanced, and the concentration and continuity of the magnetic flux transmission can be improved.

[0063] It should be noted that the designer can adjust the number of turns of the first coil according to the voltage transformation requirement of the transformer.

[0064] Referring to Figure 3 and Figure 4 In some embodiments of the present application, 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. Specifically, in the first direction of the magnetic core 1, the first direction of the magnetic core 1 can refer to the left-right direction in the magnetic core 1, the left side wall of the first slot body 121 is provided with a first limiting slot 1211, the left side wall of the second slot body 131 is provided with a second limiting slot 1311, and the left side wall of the primary winding 2 is provided with a limiting portion 22. Figure 3

[0065] In some specific embodiments, the right side wall of the first slot body 121 is provided with a first limiting slot 1211, the right side wall of the second slot body 131 is provided with a second limiting slot 1311, and the right side wall of the primary winding 2 is provided with a limiting portion 22.

[0066] In some specific embodiments, the left side wall and the right side wall of the first slot body 121 are both provided with a first limiting slot 1211, the left side wall and the right side wall of the second slot body 131 are both provided with a second limiting slot 1311, and the left side wall and the right side wall of the primary winding 2 are both provided with a limiting portion 22.

[0067] Furthermore, the limiting portion 22 is limitedly matched with the first limiting slot 1211 or the second limiting slot 1311, when the primary winding 2 is installed into the accommodating slot 11, the limiting portion 22 extends into the first limiting slot 1211 or the second limiting slot 1311, the limiting portion 22 is limitedly matched with the first limiting slot 1211 or the second limiting slot 1311, the installation position of the primary winding 2 in the magnetic core 1 is stable and does not deviate, the primary winding 2 and the secondary winding 3 maintain a close-fitting state, avoiding the occurrence of a gap in the accommodating slot 11, and ensuring that the magnetic flux is stably and continuously transmitted along the closed magnetic path of the first magnetic column 122 and the second magnetic column 132.

[0068] Referring to Figure 1 , Figure 2 and Figure 5 In some embodiments of the present application, the primary winding 2 is configured as a circuit board, the circuit board includes a first substrate 23 and a first coil, the first coil is etched on the first substrate 23, the first magnetic column 122 and / or the second magnetic column 132 passes through the first substrate 23, the first coil is arranged on the outer side of the first magnetic column 122 and the outer side of the second magnetic column 132, that is, the first magnetic column 122 and the second magnetic column 132 are located in the center of the first coil.

[0069] ​In some specific embodiments, part of the first substrates 23 in the plurality of first substrates 23 are penetrated by the first magnetic column 122, and another part of the first substrates 23 in the plurality of first substrates 23 are penetrated by the second magnetic column 132.

[0070] It should be noted that the first coil is in communication with an external power supply.

[0071] The first magnetic column 122 and / or the second magnetic column 132 penetrate the first substrate 23, so that the first substrate 23 is fixedly installed in the accommodating groove 11 of the magnetic core 1. When the first coil is energized, a magnetic field is formed in the first coil. The magnetic field in the magnetic core 1 penetrates the region of the plurality of secondary windings 3 along the magnetic path formed between the first magnetic column 122 and the second magnetic column 132. The plurality of secondary windings 3 senses the change of the magnetic flux and outputs current.

[0072] The first coil is wound around the outer side of the first magnetic column 122 and the outer side of the second magnetic column 132, so that the magnetic flux distribution is more uniform, thereby enhancing the concentration and continuity of the magnetic flux transmission, and further improving the induction efficiency and output capacity of the plurality of secondary windings 3, thereby improving the electromagnetic coupling performance of the planar transformer 100.

[0073] It should be noted that the designer can adjust the number of turns of the first coil according to the voltage transformation requirement of the transformer.

[0074] Referring to Figure 2 , Figure 5 and Figure 6 In some embodiments of the present application, the secondary winding 3 is configured as a plate member, 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 penetrate the second substrate 32. The second coil is wound around the outer side of the first magnetic column 122 and the outer side 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. The end wall of the plate member adjacent to the primary winding 2 is attached with an insulating film 33.

[0075] In some specific embodiments, part of the second substrates 32 in the plurality of second substrates 32 are penetrated by the first magnetic column 122, and another part of the second substrates 32 in the plurality of second substrates 32 are penetrated by the second magnetic column 132.

[0076] It should be noted that the second coil is in communication with an external electrical equipment.

[0077] The first magnetic column 122 and / or the second magnetic column 132 pass through the second substrate 32, so that the second substrate 32 is fixed in the accommodating groove 11 of the magnetic core 1. When the primary winding 2 is powered, 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 of the magnetic flux to generate an electric current, and the end wall of the plate member adjacent to the primary winding 2 is attached with an insulating film 33 to achieve electrical isolation.

[0078] The second coil is wound outside the first magnetic column 122 and outside the second magnetic column 132, so that the second coil is in the surrounding area of the main magnetic flux path of the magnetic core 1, thereby increasing the coupling area of the second coil and the magnetic flux, and enhancing the inductive capacity of the secondary winding 3 and reducing the magnetic leakage phenomenon, thereby improving the output performance and power density of the planar transformer 100.

[0079] It should be noted that the designer can adjust the number of turns of the second coil according to the voltage transformation requirement of the transformer.

[0080] Referring to Figure 2 , Figure 5 and Figure 6 , in some embodiments of the present application, the plate member is a plurality of plate members, and the plurality of plate members are arranged in the height direction of the magnetic core 1 in sequence. Specifically, the plurality of plate members are arranged in sequence and overlap each other, and the end wall of one plate member adjacent to another plate member is attached with an insulating film 33. That is to say, an insulating film 33 is arranged between two adjacent plate members.

[0081] By arranging a plurality of plate members, the overall copper cross-sectional area of the secondary winding 3 can be increased, and the plurality of plate members can jointly participate in current output, thereby meeting the large current output requirement of the planar transformer 100 in a high-power application scenario, and thereby improving the current-carrying capacity and output stability of the planar transformer 100.

[0082] Referring to Figure 1 and Figure 5 , in some embodiments of the present application, the primary winding 2 is provided with a first connecting hole 24 and a second connecting hole 25, a first conductive member 26 passes through a plurality of first connecting holes 24, and the first conductive member 26 is electrically connected with the first connecting hole 24. A second conductive member 27 passes through a plurality of second connecting holes 25, and the second conductive member 27 is electrically connected with the second connecting hole 25.

[0083] It should be noted that the first conductive member 26 and the second conductive member 27 are both electrically connected with an external power supply.

[0084] The first conductive member 26 and the second conductive member 27 form an electrical connection path between the plurality of primary windings 2, so that the plurality of primary windings 2 are in a parallel state, the plurality of primary windings 2 jointly bear the current load when energized to achieve current sharing, the plurality of primary windings 2 are staggered along the height direction of the magnetic core 1 and closely fit the plurality of secondary windings 3, and the plurality of secondary windings 3 induce magnetic flux changes and output current.

[0085] By the plurality of primary windings 2 being in a parallel state to jointly bear the current load, current sharing between the plurality of primary windings 2 can be achieved, thereby reducing the current density of a single primary winding 2 and the heat generation of the primary winding 2, so as to improve the output stability and service life of the planar transformer 100.

[0086] Referring to 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 the plurality of third connection holes 34, the third conductive member 37 is electrically connected with the third connection hole 34, the fourth conductive member 38 passes through the plurality of fourth connection holes 35, the fourth conductive member 38 is electrically connected with the fourth connection hole 35, and the fifth conductive member 39 passes through the plurality of fifth connection holes 36, the fifth conductive member 39 is electrically connected with the fifth connection hole 36.

[0087] The third conductive member 37, the fourth conductive member 38 and the fifth conductive member 39 respectively electrically connect the plurality of secondary windings 3 into a parallel structure, the plurality of secondary windings 3 are arranged in sequence in the height direction of the magnetic core 1 and are staggered with the plurality of primary windings 2, the plurality of secondary windings 3 induce magnetic flux changes and generate output current, and the third conductive member 37, the fourth conductive member 38 and the fifth conductive member 39 parallel the induced current of the plurality of secondary windings 3.

[0088] The third conductive member 37, the fourth conductive member 38 and the fifth conductive member 39 electrically connect the plurality of secondary windings 3 into a parallel structure to make the induced current of the plurality of secondary windings 3 converge and output, so as to increase the total conductive cross-sectional area of the secondary circuit and reduce the resistance loss in the current transmission process, thereby improving the current carrying capacity and output stability of the planar transformer 100 under large current output conditions.

[0089] Referring to Figure 1 and Figure 2 , in some embodiments of the present application, the planar transformer 100 further comprises a heat dissipation shell 4, the heat dissipation shell 4 is sleeved on the outside of the magnetic core 1, the outer peripheral wall of the magnetic core 1 is attached with a heat conducting member 14, the heat conducting member 14 is in abutting fit with the heat dissipation shell 4, and the heat conducting member 14 and the heat dissipation shell 4 are adapted for heat transfer.

[0090] The heat conducting member 14 conducts the heat generated by the magnetic core 1 during operation to the heat dissipation shell 4, and the heat dissipation shell 4 releases the heat to the external environment through convection or radiation, so that the temperature of the magnetic core 1 is controlled within a safe range, and the heat is rapidly diffused, and the planar transformer 100 is in a stable heat dissipation state.

[0091] The heat generated by the magnetic core 1 is conducted to the heat dissipation shell 4 through the heat conducting member 14, so that the heat dissipation shell 4 releases the heat to the external environment in time, thereby reducing the risk of temperature rise of the magnetic core 1 during operation, and further improving the thermal stability and continuous working ability of the planar transformer 100 under high power and high load working conditions.

[0092] In some specific embodiments, the heat conducting member 14 can be a heat conducting silica gel pad.

[0093] In some specific embodiments, the heat dissipation shell 4 is made of aluminum alloy.

[0094] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope 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; 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); 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).

2. A planar transformer according to claim 1, 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).

3. The planar transformer according to claim 1, wherein: 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).

4. The planar transformer according to claim 1, wherein: 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).

5. The planar transformer according to claim 1, 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).

6. The planar transformer according to claim 5, 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.

7. 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).

8. 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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