Planar transformer

Abstract

The planar transformer comprises windings and a coupling assembly, the windings comprise a first winding and a second winding arranged opposite to the first winding, and the first winding and the second winding are both formed by bending metal foils; the coupling assembly comprises a magnetic core, a coil and an outgoing line, the coil is arranged between the first winding and the second winding, the magnetic core is arranged on the outer side of the first winding and the outer side of the second winding, the windings achieve electromagnetic coupling through the magnetic core and the coil, one end of the outgoing line is connected with the coil, and the other end of the outgoing line is connected with an external circuit. Compared with a traditional planar transformer which uses a flat wire, the winding formed by bending the metal foil has the advantages that the vertical space of the planar transformer is reduced, the situation that wrinkles and damage possibly occur in the winding process of the traditional flat wire is avoided, and the reliability of the planar transformer is improved.

Description

TECHNICAL FIELD

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

[0002] With the development of technology, power supply systems have increasingly high requirements for the efficiency, reliability and miniaturization design of power supply modules. In the field of mobile devices, portable electronic products and the like, lightweight and compact design has become a key trend. Under this background, developing efficient, reliable and small-space-occupying power supply solutions has become a key to technological development.

[0003] Traditional planar transformers usually use flat magnetic cores and flat wires in the manufacturing process. However, the flat wire has a large width-thickness ratio, which often causes problems such as coil wrinkles and enamel skin damage during winding. These defects not only reduce the overall reliability of the planar transformer, but also increase the winding height, affecting its application in space-limited scenarios. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a planar transformer to solve the problems of reduced reliability and increased winding height of the planar transformer due to phenomena such as coil wrinkles and enamel skin damage during winding in the prior art.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the present application is as follows:

[0006] The present application provides a planar transformer, comprising a winding and a coupling assembly,

[0007] The winding comprises a first winding and a second winding disposed opposite to the first winding, and the first winding and the second winding are both bent from a metal foil sheet;

[0008] The coupling assembly comprises a magnetic core, a coil and a lead wire, the coil is disposed between the first winding and the second winding, the magnetic core is disposed outside the first winding and the second winding, the winding realizes electromagnetic coupling through the magnetic core and the coil, and one end of the lead wire is connected to the coil and the other end is connected to an external circuit.

[0009] Further, the metal foil sheet is composed of two winding layers connected in central symmetry.

[0010] Further, the shape of the winding layer can be circular, elliptical, rectangular or irregular.

[0011] Further, the connection between the two winding layers is provided with a folding line for reducing mechanical stress on the metal foil sheet during bending, so that the foil sheet is not easily damaged or wrinkled when folded, maintaining the integrity of the foil sheet.

[0012] Further, the metal foil is provided with pins at both ends, the shape of the pins can be L-shaped or I-shaped, and mounting holes are arranged on the pins.

[0013] Further, the metal foil is made of copper.

[0014] Further, the magnetic core comprises an upper magnetic core and a lower magnetic core, a center column is arranged in the middle of the upper magnetic core and the lower magnetic core, and the coil, the first winding and the second winding are sleeved on the center column to guide the magnetic flux and form a closed magnetic circuit.

[0015] Further, the upper magnetic core and the lower magnetic core are both flat magnetic cores.

[0016] Further, the coil is arranged between the first winding and the second winding, and is used for realizing electromagnetic coupling through the magnetic core, the first winding and the second winding.

[0017] Further, the lead-out wire comprises a first lead-out wire and a second lead-out wire, the first lead-out wire and the second lead-out wire are Z-shaped, are respectively connected to both ends of the coil, and are used for being connected to an external circuit.

[0018] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0019] 1. The winding formed by bending the metal foil can more effectively save space and reduce the vertical space of the planar transformer compared with the flat wire used in the traditional planar transformer.

[0020] 2. By arranging the folding line on the metal foil, the wrinkling and damage that may occur during the winding process of the traditional flat wire are avoided, and the reliability of the planar transformer is improved.

[0021] 3. The metal foil made by the wire cutting process can realize customization of the shape of the winding, meet different application requirements, and improve the flexibility and adaptability of the equipment. DETAILED DESCRIPTION

[0022] Figure 1 It is a whole structure schematic view of the planar transformer of the utility model;

[0023] Figure 2 It is an exploded view of the planar transformer of the utility model;

[0024] Figure 3 It is a front view of the metal foil of the planar transformer of the utility model Figure 1

[0025] Figure 4 It is a front view of the metal foil of the planar transformer of the utility model Figure 2 ;

[0026] Figure 5 is a first winding front view of the planar transformer of the utility model;

[0027] Figure 6 is a second winding front view of the planar transformer of the utility model.

[0028] Reference Signs:

[0029] 1, upper magnetic core; 2, lower magnetic core; 3, first winding; 4, second winding; 5, metal foil; 5-1, winding layer; 5-2, folding line; 5-3, pin; 5-3-1, mounting hole; 6, coil; 7, first lead-out wire; 8, second lead-out wire; 9, connecting column. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0033] As Figures 1 to 6 shown, an embodiment of the present application provides a planar transformer, comprising: a winding and a coupling assembly,

[0034] The winding includes a first winding 3 and a second winding 4 arranged opposite to the first winding 3, and the first winding 3 and the second winding 4 are both folded by a metal foil 5;

[0035] The coupling assembly includes a magnetic core, a coil 6 and a lead wire, the coil 6 is arranged between the first winding 3 and the second winding 4, the magnetic core is arranged on the other side of the first winding 3 and the second winding 4, the winding realizes electromagnetic coupling through the magnetic core and the coil 6, one end of the lead wire is connected to the coil 6, and the other end of the lead wire is connected to an external circuit.

[0036] Preferably, the metal foil 5 is composed of two center-symmetrically connected winding layers 5-1.

[0037] Preferably, the shape of the winding layer 5-1 can be circular, oval, rectangular or irregular.

[0038] The metal foil 5 is made by a wire cutting process, in which the metal foil 5 can be accurately cut and processed to produce a winding shape that meets the design requirements, and the shape of the winding layer 5-1 can be customized to meet different application requirements and improve the flexibility and adaptability of the equipment.

[0039] Preferably, the connection between the two winding layers 5-1 is provided with a folding line 5-2, which is used to reduce the mechanical stress on the metal foil 5 during the folding process, so that the foil is not easily damaged or wrinkled when folded, and the integrity of the foil is maintained.

[0040] The folding line 5-2 formed by the stamping process can pre-thin the metal material at the folding line 5-2, so that the stress concentration during folding is smaller, thereby enhancing the structural strength after folding, reducing the risk of damage, and improving the reliability of the planar transformer.

[0041] Preferably, the metal foil 5 is provided with a pin 5-3 at both ends, the shape of the pin 5-3 can be L-shaped or I-shaped, and the pin 5-3 is provided with a mounting hole 5-3-1.

[0042] The pin 5-3 arranged at both ends of the metal foil 5 is used to realize the connection with the external circuit, and different shapes of the pin 5-3 adapt to different installation requirements, and the mounting hole 5-3-1 is arranged on the pin 5-3, which facilitates the stable connection of the pin 5-3 to the circuit board or other components through the connecting column 9 or other fixing methods, and ensures good electrical contact and mechanical stability.

[0043] Preferably, the metal foil 5 is made of copper material.

[0044] Preferably, the magnetic core, including the upper magnetic core 1 and the lower magnetic core 2, the middle of the upper magnetic core 1 and the lower magnetic core 2 is provided with a center column, the coil, the first winding 3 and the second winding 4 are sleeved on the center column, for guiding the magnetic flux and forming a closed magnetic circuit.

[0045] Preferably, the upper magnetic core 1 and the lower magnetic core 2 are both flat magnetic cores.

[0046] Preferably, the coil 6 is arranged between the first winding 3 and the second winding 4, for realizing electromagnetic coupling through the magnetic core, the first winding 3 and the second winding 4.

[0047] Preferably, the lead-out wire includes the first lead-out wire 7 and the second lead-out wire 8, the first lead-out wire 7 and the second lead-out wire 8 are Z-shaped, and are respectively connected to two ends of the coil 6, for being connected to an external circuit.

[0048] The first winding 3 and the second winding 4 formed by bending the metal foil 5 are arranged on the upper and lower sides of the coil 6, the coil 6 as a primary winding is connected to the external circuit through the first lead-out wire 7 and the second lead-out wire 8, for receiving an input power and generating a magnetic field, and the first winding 3 and the second winding 4 as a secondary winding are connected to the external circuit through the pin 5-3, for outputting an induced voltage.

[0049] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements also as the protection scope of the present application.

[0050] The technical features of the above embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of these technical features does not exist contradictory, should be considered as the scope of the present application.

[0051] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A planar transformer, characterized by The winding and coupling assembly, The winding includes a first winding (3) and a second winding (4) arranged opposite to the first winding (3), and the first winding (3) and the second winding (4) are both folded by a metal foil (5); The coupling assembly includes a magnetic core, a coil (6) and a lead-out wire, the coil (6) is arranged between the first winding (3) and the second winding (4), the magnetic core is arranged outside the first winding (3) and the second winding (4), the winding realizes electromagnetic coupling through the magnetic core and the coil (6), one end of the lead-out wire is connected to the coil (6), and the other end is connected to an external circuit. The metal foil (5) is composed of two center-symmetrically connected winding layers (5-1).

2. The planar transformer according to claim 1, characterized in that The shape of the winding layer (5-1) can be circular, oval, rectangular or irregular.

3. The planar transformer according to claim 2, characterized in that The connection between the two winding layers (5-1) is provided with a folding line (5-2) for reducing mechanical stress on the metal foil (5) during folding, so that the foil is not easily damaged or wrinkled during folding, and the integrity of the foil is maintained.

4. The planar transformer according to claim 3, characterized in that The metal foil (5) is provided with a pin (5-3) at both ends, the shape of the pin (5-3) can be L-shaped or I-shaped, and the pin (5-3) is provided with a mounting hole (5-3-1).

5. The planar transformer according to claim 4, characterized in that The metal foil (5) is made of copper material.

6. The planar transformer according to claim 5, characterized in that The magnetic core includes an upper magnetic core (1) and a lower magnetic core (2), the center column is arranged in the middle of the upper magnetic core (1) and the lower magnetic core (2), the coil (6), the first winding (3) and the second winding (4) are sleeved on the center column, and the center column is used for guiding magnetic flux and forming a closed magnetic circuit.

7. The planar transformer according to claim 6, characterized in that The upper magnetic core (1) and the lower magnetic core (2) are both flat magnetic cores.

8. The planar transformer according to claim 7, characterized in that The coil (6) is arranged between the first winding (3) and the second winding (4), and is used for realizing electromagnetic coupling through the magnetic core, the first winding (3) and the second winding (4).

9. The planar transformer of claim 8, wherein The lead-out wire includes a first lead-out wire (7) and a second lead-out wire (8), the first lead-out wire (7) and the second lead-out wire (8) are Z-shaped, and are respectively connected to both ends of the coil (6), and are used for connecting to an external circuit.

10. The planar transformer of claim 9, wherein, ​

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