High-frequency transformer winding and high-frequency transformer
By using multi-copper foil welding and wrapping high-temperature insulating tape on the winding pins of the high-frequency transformer, the heat generation problem caused by the skin effect was solved, effectively reducing the temperature rise and improving the reliability of the system.
Patent Information
- Application Number
- CN202520314535.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The skin effect in high-frequency transformer windings causes severe overheating at the pins, affecting the reliability and efficiency of power electronic systems.
By employing multi-copper foil welding and wrapping with high-temperature insulating tape, multiple sheet copper foils are connected in parallel and the insulating tape is wrapped around the pin surface to reduce the impact of the skin effect.
This effectively reduces the temperature rise of the high-frequency transformer, decreases heat generation, and improves the reliability and efficiency of the system.
Smart Images
Figure CN223808978U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of power electronic devices, and particularly relates to a high-frequency transformer winding and a high-frequency transformer. BACKGROUND
[0002] The high-frequency transformer winding has a crucial influence on the whole power electronic system, undertakes the role of energy conversion and transmission, is mainly composed of a magnetic core and a winding, and good temperature rise control can help improve the reliability and efficiency of the power electronic system. The current flowing through the high-frequency transformer winding needs to flow through a pin and be transmitted to the winding through the pin to convert energy. The pin, as the first carrier of the current, is more obviously affected by the skin effect, and heat is more easily accumulated at the pin, causing the transformer to heat up seriously. SUMMARY
[0003] To solve the above problems, the purpose of the embodiments of the utility model is to provide a high-frequency transformer winding and a high-frequency transformer.
[0004] In the first aspect, the utility model provides a kind of high-frequency transformer winding, winding is wound on the surface of magnetic core, pin is connected with the winding, and isolation adhesive tape;The material of the winding is copper foil, and the effective cross-sectional area of the winding is greater than or equal to the effective cross-sectional area of the winding under the condition of multiple wire winding;The pin includes multiple groups of sheet copper foil, each group of sheet copper foil includes multiple sheet copper foils, and the multiple groups of sheet copper foils are welded and fixed at both ends of the winding;The isolation adhesive tape is wound and arranged on the surface of the pin.
[0005] Optionally, the winding is multiple-layer copper foil winding.
[0006] Optionally, the number of layers of the isolation adhesive tape is at least three.
[0007] Optionally, each group of sheet copper foils is welded and fixed at both ends of the winding;The first end of the winding is fixedly arranged on the magnetic core, the middle part of the winding is wound around the middle column of the magnetic core with a predetermined number of turns and is fixedly arranged on the surface of the magnetic core, and the second end of the winding is fixedly arranged at the position of the first end, and the multiple groups of sheet copper foils are connected in parallel.
[0008] Optionally, the isolation adhesive tape is wound between each sheet copper foil.
[0009] In the second aspect, the utility model provides a kind of high-frequency transformer, as described above any one of high-frequency transformer winding, multiple wire winding winding and magnetic core;The high-frequency transformer winding and the multiple wire winding winding are wound on the surface of the magnetic core respectively.
[0010] Optionally, the high-frequency transformer winding is a secondary winding of the high-frequency transformer, and the winding in the multi-strand wire parallel-wound case is a primary winding of the high-frequency transformer.
[0011] In the scheme provided in the first aspect above, the copper foil is isolated by using the multi-copper foil welding and the winding isolation tape, the influence of the skin effect at the pin is greatly reduced, the heat of the high-frequency transformer is reduced, and the measured temperature rise of the transformer using the high-frequency transformer winding can be effectively reduced.
[0012] In the scheme provided in the second aspect above, the high-temperature isolation tape in the multi-plate copper foil parallel-wound and wound on the pin of the high-frequency transformer winding can be effectively used to isolate the copper foils, thereby greatly reducing the influence of the skin effect at the pin of the high-frequency transformer, reducing the heat of the high-frequency transformer, and effectively reducing the temperature rise of the transformer.
[0013] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.
[0015] Figure 1 The structure schematic diagram of the high-frequency transformer winding provided by the utility model embodiment is shown;
[0016] Figure 2 The connection mode plane expansion schematic diagram of the winding and the pin in the high-frequency transformer winding provided by the utility model embodiment is shown;
[0017] Figure 3 The structure schematic diagram of the high-frequency transformer provided by the utility model embodiment is shown.
[0018] Icon:
[0019] 1-winding, 2-pin, 3-isolation tape, 101-high-frequency transformer winding, 102-winding in the multi-strand wire parallel-wound case, A-a group of plate copper foils, C-magnetic core. DETAILED DESCRIPTION
[0020] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.
[0021] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.
[0022] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0023] In the application of high-frequency transformer winding, due to the influence of skin effect, current can only accumulate on the surface of the wire, especially at the high-frequency transformer winding pin, most of the current is concentrated here, and the accumulated heat is transmitted to the transformer body, which is particularly obvious in high-frequency and high-power application scenarios, and can cause unnecessary loss.
[0024] In order to solve this problem, usually use multiple mutually insulated thin wires to replace the thick wires of the same cross-sectional area, or directly use hollow wires instead of solid wires. However, the inventors found that: in the application of high-frequency transformer winding large current, due to the limitation of transformer winding window area and pin size, there is not enough space to support the use of multiple thin wires and winding under the same cross-sectional area of the wire.
[0025] Therefore, the utility model embodiment proposes a high-frequency transformer winding, which can reduce the influence of skin effect, improve the serious heating condition of the transformer, control the temperature rise of the high-frequency transformer winding within a reasonable range, and avoid safety hazards. Specifically, as shown inFigure 1 and Figure 2 As shown, the high-frequency transformer winding includes: wound on a magnetic core ( Figure 1 The figure shows (indicated by reference numeral C) the winding 1, the pin 2 connected to the winding 1, and the insulating tape 3. It should be noted that... Figure 2 This diagram illustrates the connection between winding 1 and pin 2, showing the planar unfolded effect of winding 1. Typically, to avoid saturation in high-frequency transformers, a suitable air gap needs to be selected for the magnetic core during design. The material of winding 1 is copper foil, and the effective cross-sectional area of winding 1 is greater than or equal to the effective cross-sectional area of a winding with multiple strands of wire wound in parallel. In this embodiment, the winding with multiple strands of wire wound in parallel can be understood as a commonly used alternative to thick wires of the same cross-sectional area, i.e., a winding using multiple strands of fine, insulated wires braided into a bundle. In this embodiment, the effective cross-sectional area of winding 1 is not less than the effective cross-sectional area of a winding obtained by using the same number of fine strands of wire wound in parallel.
[0026] Furthermore, pin 2 includes multiple sets of sheet-like copper foils ( Figure 1 (The figure shows a set of sheet copper foils, labeled A). Each set of sheet copper foils contains multiple sheet copper foils. (For clarity, the figure shows...) Figure 1 (The diagram does not directly show multiple sheet copper foils.) Multiple sets of sheet copper foils are soldered and fixed to both ends of winding 1. For example, pin 2 may include two sets of sheet copper foils, each set containing three sheet copper foils. The two sets of sheet copper foils can be fixedly connected to both ends of winding 1 by soldering to form pin 2. Alternatively, a pin 2 may also include four sets of sheet copper foils, each set containing two sheet copper foils. The four sets of sheet copper foils can be fixedly connected to both ends of winding 1 by soldering, such as soldering two sets of sheet copper foils to both ends of winding 1 to form pin 2. This embodiment of the invention does not specifically limit the number of sheet copper foils on pin 2. Within the design space, multiple sheet copper foils can shunt current, and the more foils there are, the better the shunt effect, thereby avoiding heat accumulation in a certain area; furthermore, soldering can also increase the current carrying and heat dissipation area.
[0027] Furthermore, in this embodiment of the invention, the insulating tape 3 is wrapped around the surface of the pin 2. The insulating tape 3 can be understood as a high-temperature insulating tape. Wrapping the insulating tape 3 around the surface of the pin 2 can prevent the pin 2 from overheating after passing a large current, which would damage the ordinary tape and cause the insulation function to fail.
[0028] The high-frequency transformer winding provided in this embodiment of the invention significantly reduces the skin effect at pin 2 by using multi-copper foil welding and wrapping with insulating tape to achieve isolation between copper foils, thereby reducing the heat generation of the high-frequency transformer. Actual measurements show that the temperature rise of the transformer using this high-frequency transformer winding can be effectively reduced.
[0029] Optionally, winding 1 is a multi-layer copper foil winding. In the same space, the use of multi-layer copper foil winding can significantly improve the current carrying capacity of magnetic devices compared with copper wire, increase the heat dissipation area, improve the heat dissipation effect, and significantly reduce the heat accumulation of high-frequency transformers.
[0030] Optionally, the insulating tape 3 is wound in at least three layers. In this embodiment of the invention, using three layers of tape satisfies the interlayer insulation requirements.
[0031] Optionally, each set of sheet copper foil is welded and fixed to both ends of winding 1. For example, pin 2 includes two sets of sheet copper foil, and the two sets of sheet copper foil correspond one-to-one with the two ends of winding 1 and are welded and fixed. In this embodiment of the invention, the two ends of winding 1 are named the first end and the second end for distinction. The first end of winding 1 (with at least one set of sheet copper foil welded on, such as one set) is fixedly disposed on the magnetic core. The middle part of winding 1 (i.e., the remaining part other than the first end) is wound around the central column of the magnetic core a predetermined number of turns and then fixedly disposed on the surface of the magnetic core. The second end of winding 1 returns and is fixedly disposed at the position of the first end, that is, the first end and the second end of winding 1 are overlapped. Each set of sheet copper foil welded to the first end and the second end also overlaps, that is, multiple sets of sheet copper foil are fixed in parallel, thereby obtaining pin 2 of the high-frequency transformer winding (i.e., multiple sheet copper foils together serve as pins of the high-frequency transformer).
[0032] Optionally, insulating tape 3 is wrapped between each sheet of copper foil, that is, insulating tape 3 is wrapped between parallel sheet of copper foil. For example, three layers of high-temperature insulating tape can be wrapped at the position where each sheet of copper foil is soldered to one end of the winding 1. Due to the presence of insulating tape 3, when the current flows through the pin 2, it will be dispersed by multiple sheet of copper foil and distributed to different positions of the winding 1, which greatly reduces the heat accumulation problem caused by the skin effect.
[0033] Furthermore, this embodiment of the invention also provides a high-frequency transformer, such as... Figure 3 As shown, the high-frequency transformer includes: any of the aforementioned high-frequency transformer windings 101, a winding 102 with multiple strands of wire wound in parallel, and a magnetic core. The high-frequency transformer winding 101 and the winding 102 with multiple strands of wire wound in parallel are respectively wound on the surface of the magnetic core. It should be noted that the magnetic core here is the same magnetic core wound around winding 1 of the aforementioned high-frequency transformer winding 101.
[0034] The high-frequency transformer provided by this utility model embodiment can effectively utilize the high-temperature insulating tape wrapped in parallel with multiple sheet copper foils on the pin of the high-frequency transformer winding 101 to achieve isolation between copper foils, thereby significantly reducing the influence of the skin effect at the pin of the high-frequency transformer, reducing the heat generation of the high-frequency transformer, and effectively reducing the measured temperature rise of the transformer.
[0035] Optionally, as shown in Figure 3 The high-frequency transformer winding 101 is a secondary winding of the high-frequency transformer, and the winding 102 in the case of multi-strand parallel winding is a primary winding of the high-frequency transformer.
[0036] That is, the high-frequency transformer winding 101 improved by the embodiment of the utility model can be used as the secondary winding N2 of the high-frequency transformer, and correspondingly, the primary winding N1 of the high-frequency transformer can be selected to be woven into a bundle by a plurality of mutually insulated thin wires as a winding, that is, the winding 102 in the case of multi-strand parallel winding. Preferably, under the condition of meeting the requirements of design turns and magnetic core winding window area, the wire diameter of the primary winding N1 (that is, the winding 102 in the case of multi-strand parallel winding) is as large as possible, and the heat caused by the coil can be greatly improved. Under the premise of meeting the limitation requirements, the larger the cross-sectional area and the parallel number of the secondary winding N2 (that is, the high-frequency transformer winding 101), the greater the influence of the skin effect will be reduced to a greater extent.
[0037] The following table 1 is a "temperature rise comparison data table of the high-frequency transformer provided by the embodiment of the utility model and the traditional transformer under the condition that the parameters of the transformer are the same":
[0038]
[0039]
[0040] Table 1: Temperature rise comparison data table of the high-frequency transformer provided by the embodiment of the utility model and the traditional transformer under the condition that the parameters of the transformer are the same
[0041] It can be seen that the high-frequency transformer provided by the embodiment of the utility model can effectively control the temperature rise of the transformer within a reasonable range.
[0042] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacement technical solutions within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.
Claims
1. A high frequency transformer winding, characterized by It comprises: a winding (1) wound on the surface of a magnetic core, a pin (2) connected with the winding (1), and an isolation tape (3); the material of the winding (1) is copper foil, and the effective cross-sectional area of the winding (1) is greater than or equal to the effective cross-sectional area of the winding in the case of multi-strand wire winding; the pin (2) comprises multiple groups of sheet copper foil, each group of sheet copper foil comprises multiple sheet copper foils, and the multiple groups of sheet copper foil are welded and fixed at both ends of the winding (1); the isolation tape (3) is wound on the surface of the pin (2).
2. The high-frequency transformer winding according to claim 1, characterized in that The winding (1) is multi-layer copper foil winding.
3. The high-frequency transformer winding of claim 1, wherein The number of winding layers of the isolation tape (3) is at least three.
4. The high-frequency transformer winding of claim 1, wherein, Each group of sheet copper foils is welded and fixed at both ends of the winding (1); the first end of the winding (1) is fixed on the magnetic core, the middle part of the winding (1) is wound around the middle column of the magnetic core with a predetermined number of turns and is fixed on the surface of the magnetic core, the second end of the winding (1) is fixed at the position of the first end, and multiple groups of sheet copper foils are connected in parallel.
5. The high-frequency transformer winding of claim 1, wherein, The isolation tape (3) is wound between each sheet copper foil.
6. A high frequency transformer, characterized by It comprises: a high-frequency transformer winding (101), a multi-strand wire winding winding (102), and a magnetic core according to any one of claims 1-5; the high-frequency transformer winding (101) and the multi-strand wire winding winding (102) are wound on the surface of the magnetic core, respectively.
7. The high-frequency transformer according to claim 6, characterized in that The high-frequency transformer winding (101) is the secondary winding of the high-frequency transformer, and the multi-strand wire winding winding (102) is the primary winding of the high-frequency transformer.