Magnetic switch structure
By using wide-width thin copper foil to wind the winding and adding insulating layer and transformer oil filling in the magnetic switch, the problems of insufficient conduction capacity and high voltage resistance of magnetic switches in the prior art under high current conditions are solved, and high efficiency is achieved Magnetic switch design.
Patent Information
- Application Number
- CN202323401502.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-13
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-13
AI Technical Summary
Existing magnetic switches are difficult to achieve under high current conditions, especially the iron core wound with single or multi-strand enameled wires is limited, which leads to difficult process difficulty and limited voltage resistance and difficulty in passing through large currents.
At least two sections of winding are wound with wide-width thin copper foil and connected in series. The winding direction of each section of winding is the same. The terminals of the first section and the last section of winding are connected to the external circuit, adding an insulating layer and filling between the winding turns. Transformer oil to improve conduction and high voltage resistance.
Overcome the skin effect, improve the conduction ability, realize high current magnetic switch, reduce costs, and improve the high voltage and heat dissipation ability of the magnetic switch.
Smart Images
Figure CN222300428U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of magnetic switches, and in particular to a magnetic switch structure. Background Art
[0002] At present, the core of magnetic saturation inductor is mostly ring-shaped, and the coil is wound with single or multiple enameled wires. The cross-sectional area of a single enameled wire is limited, and it is difficult to pass a large current even if multiple strands are wound in parallel. When the current required to pass is extremely large, multiple strands need to be wound in parallel, which is difficult to achieve in terms of technology or extremely difficult to process. Utility Model Content
[0003] In view of this, the present application provides a magnetic switch structure, and its specific solution is as follows:
[0004] A magnetic switch structure, comprising:
[0005] Iron core;
[0006] At least two windings, the at least two windings are arranged on the iron core, and each winding is wound with a wide thin copper foil;
[0007] The at least two winding sections have the same winding direction, are connected in series, and the first end of the first winding section and the second end of the last winding section of the at least two winding sections are respectively connected to an external circuit.
[0008] Furthermore,
[0009] The iron core is a square structure.
[0010] Furthermore,
[0011] The cross section of the iron core is square or rectangular.
[0012] Furthermore,
[0013] The at least two winding sections include at least four winding sections respectively wound on four sides of the square structure of the iron core.
[0014] Furthermore,
[0015] Each turn of each winding segment is insulated and isolated by a film, and the film is made of a single layer or multiple layers of a first insulating material.
[0016] Furthermore,
[0017] The width of the film is at least greater than the width of the wide-width thin copper foil.
[0018] Furthermore,
[0019] The first insulating material at least includes: polyurethane or polyimide.
[0020] Furthermore, it also includes:
[0021] The insulating layer is realized by coating the surface of the wide thin copper foil with a second insulating material.
[0022] Furthermore,
[0023] Each turn of each winding section is filled with transformer oil.
[0024] It can be seen from the above technical scheme that the magnetic switch structure disclosed in the present application includes: an iron core and at least two windings, at least two windings are arranged on the iron core, each winding is made of wide thin copper foil, wherein the winding direction of at least two windings is the same, at least two windings are connected in series, and the first end of the first winding and the second end of the last winding of at least two windings are respectively connected to the external circuit. This scheme realizes magnetic switching by using wide thin copper foil to make windings and at least two windings are arranged on the iron core. The use of thin copper foil can overcome the skin effect and improve the conduction capacity, and solves the problem that the magnetic switch is difficult to achieve large current due to the use of single-strand or multi-strand enameled wire winding. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0026] Figure 1 A schematic structural diagram of a magnetic switch structure disclosed in an embodiment of the present application;
[0027] Figure 2 A schematic structural diagram of a magnetic switch structure disclosed in an embodiment of the present application;
[0028] Figure 3 A schematic structural diagram of a magnetic switch structure disclosed in an embodiment of the present application;
[0029] Figure 4 A schematic structural diagram of a magnetic switch structure disclosed in an embodiment of the present application;
[0030] Figure 5 A schematic structural diagram of a cross section of an iron core of a magnetic switch structure disclosed in an embodiment of the present application;
[0031] Figure 6 This is a structural schematic diagram of the cross section of an iron core of a magnetic switch structure disclosed in an embodiment of the present application. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0033] The present application discloses a magnetic switch structure, and its structural schematic diagram is as follows: Figure 1 As shown, including:
[0034] An iron core 11 and at least two windings 12 .
[0035] At least two winding sections are arranged on the iron core, and each winding section is wound with a wide thin copper foil.
[0036] The winding directions of at least two windings are the same, the at least two windings are connected in series, and the first end of the first winding and the second end of the last winding of the at least two windings are respectively connected to the external circuit.
[0037] The magnetic switch determines the isolation time between the main circuit and the trigger circuit.
[0038] The principle is: based on the nonlinear characteristics of magnetic materials, that is, blocking the DC voltage for a certain period of time, when the magnetic core reaches saturation, the magnetic permeability of the magnetic material drops rapidly, and the inductance also drops rapidly, and the magnetic switch is turned on.
[0039] The relationship between the saturation time τ of the magnetic switch and the magnetic switch parameters and external factors is:
[0040]
[0041] Where ΔB is the change in magnetic induction intensity in the coil, N k is the number of coil turns, A k is the core cross-sectional area.
[0042] ΔB=B r +B s
[0043] Among them, B r is the residual magnetic flux density, B s is the saturation flux density.
[0044] In addition to satisfying the above relationship, the design of the magnetic switch must also satisfy the following requirement: the unsaturated inductance L0 is much larger than the saturated inductance L s ; and, saturation inductance L s It is very small and has almost no effect on the original circuit.
[0045] The unsaturated inductance of the magnetic switch is:
[0046]
[0047] Where μ0 is the vacuum magnetic permeability, μ τ is the relative magnetic permeability, l is the average magnetic path length, F s is the stacking factor.
[0048] F s =0.98*(d i +d m )
[0049] d i is the thickness of the insulating material, d m is the thickness of the core material.
[0050] The saturation inductance of the magnetic switch is:
[0051]
[0052] If a toroidal core is used, assuming the area of a single core is A, then the number of cores required is
[0053] m=SA
[0054] If the winding of the magnetic switch uses a single-strand enameled wire or multiple-strand enameled wire, it will have a limited cross-sectional area and it will be difficult to pass large currents. When the current that needs to pass is extremely large, multiple strands need to be wound in parallel, which is difficult to achieve or difficult to process.
[0055] In addition, magnetic switches usually work under extreme working conditions with extremely high voltage rise or drop rates. The outer insulation layer of the enameled wire is usually thin and has limited voltage withstand capability. The inter-turn insulation capacity is limited by the outer insulating paint layer and it is difficult to withstand high voltage between turns.
[0056] The saturable inductor used in the high-power magnetic compression high-voltage power supply has the characteristics of large current peak and high turn-to-turn voltage. In order to meet the technical parameter requirements and solve the above problems, in this solution, at least two windings are set on the iron core, and each winding is wound with wide thin copper foil.
[0057] Compared with enameled wire, the use of thin copper foil can better overcome the skin effect and improve the utilization rate of the core window.
[0058] The skin effect will reduce the actual flow area, that is, the impedance will increase at high frequencies, increasing losses. The higher the frequency, the more obvious the skin effect. In order to pass large currents, enameled wires are used, and the path needs to be designed to be thicker, but it will still be affected by the skin effect, resulting in a decrease in flow capacity. Using thin copper foil will avoid the influence of the skin effect.
[0059] At least two winding sections are arranged on the iron core, and the winding direction of each winding section is the same, which can be taken as clockwise direction or counterclockwise direction, and is wound from inside to outside.
[0060] At least two winding sections are connected in series, and a first end of a first winding section and a second end of a last winding section of the at least two winding sections are respectively connected to an external circuit.
[0061] The starting end of each winding section can be set as the first end, that is, the head of the winding section, and the ending end of each winding section can be set as the second end, that is, the tail of the winding section. Each winding section is wound from the outside of the main view of the iron core, and the tail is also located outside the main view of the iron core.
[0062] The windings can be numbered, such as 1, 2, 3, 4, etc., and except for the head of winding No. 1, that is, the first end of the first end winding, and the tail of the last section of the winding, that is, the second end of the last section of the winding, the remaining windings are set to connect the heads and tails of adjacent windings, that is, the tail of winding No. 1 is connected to the head of winding No. 2, the tail of winding No. 2 is connected to the head of winding No. 3, and so on, to achieve series connection of the windings.
[0063] Furthermore, the number of turns of different windings in the same magnetic switch structure can be set to be the same.
[0064] The magnetic switch structure disclosed in this embodiment includes: an iron core and at least two windings, at least two windings are arranged on the iron core, each winding is made of wide thin copper foil, wherein the winding direction of at least two windings is the same, at least two windings are connected in series, and the first end of the first winding and the second end of the last winding of at least two windings are respectively connected to an external circuit. This solution realizes magnetic switching by using wide thin copper foil to make windings and at least two windings are arranged on the iron core. The use of thin copper foil can overcome the skin effect and improve the conduction capacity, and solves the problem that the magnetic switch is difficult to achieve large current due to the use of single-strand or multi-strand enameled wire winding.
[0065] This embodiment discloses a magnetic switch structure, and its structural schematic diagram is shown in FIG. Figure 2 As shown, including:
[0066] An iron core 21 and at least two windings 22 .
[0067] In addition to the same structure as the previous embodiment, the iron core 21 in this embodiment may be a square structure.
[0068] When the iron core is a square structure, at least two windings can be: four windings respectively wound on the four sides of the square structure of the iron core, that is, a winding is set on each side of the square, and the windings on adjacent sides of the square are connected to realize the series connection of the windings.
[0069] like Figure 3As shown, it includes: an iron core 21 and a winding 22. The winding 22 is divided into four sections, which are respectively arranged on the four sides of the iron core and connected in series. Except for the first end of the first section of the winding and the second end of the last section of the winding, the other windings are arranged to be connected at the heads and tails of adjacent windings.
[0070] You can set the number for the winding, such as: set it to 1, 2, 3, 4 in sequence, then Figure 3 As shown in , the first end of winding No. 1 is A1, the second end of winding No. 1 is X1, the first end of winding No. 2 is A1, the second end of winding No. 2 is X2, the first end of winding No. 3 is A3, the second end of winding No. 3 is X3, the first end of winding No. 4 is A4, and the second end of winding No. 4 is X4.
[0071] Among them, A1 and X4 are connected to the external circuit respectively, X1 is connected to A2, X2 is connected to A3, and X3 is connected to A4, so as to realize the series connection of 4 windings.
[0072] Connecting four windings in series can fully utilize the core and window, increase the filling rate and reduce costs.
[0073] in, Figure 3 That is, the main view of the magnetic switch structure. The winding is wound with Figure 3 The main view shown is used as a reference for winding. Figure 3 The winding starts from the outside of the main view of the iron core shown, the head of each winding section is located outside the main view of the iron core, and the tail of each winding section is also located outside the main view of the iron core.
[0074] Alternatively, even if the four windings are not connected in series, the magnetic switch function can be realized, solving the problem that the magnetic switch is difficult to realize large current due to the use of single-strand or multi-strand enameled wire winding, such as Figure 4 As shown, it includes: an iron core 21 and a winding 22. The winding 22 is divided into four sections, which are respectively arranged on the four sides of the iron core. The first end and the second end of each winding section are not connected to other windings. However, the first end of the first winding section and the second end of the last winding section are still connected to the external circuit, and the head and tail connections of other windings are all internal connections of the magnetic switch.
[0075] Furthermore, the cross section of the core may be square, rectangular or R-shaped. Regardless of the shape of the cross section of the core, the square structure formed by the core is not affected.
[0076] The core cross-section is designed to be square, rectangular or R-shaped, and the winding uses copper foil instead of enameled wire. This design also facilitates the lead-out of the winding terminals.
[0077] like Figure 5 FIG. 1 is a schematic cross-sectional view of an iron core of a magnetic switch structure, comprising: an iron core 21 and a winding 22, Figure 5The cross section of the core 21 shown is a square, and the cross section of each winding is also a square;
[0078] like Figure 6 FIG. 1 is a schematic cross-sectional view of an iron core of a magnetic switch structure, comprising: an iron core 21 and a winding 22, Figure 6 The cross section of the core 21 shown is rectangular, and the cross section of each winding is also rectangular;
[0079] In addition, the cross section of the core may also be other shapes, which will not be described in detail here.
[0080] The magnetic switch structure disclosed in this embodiment includes: an iron core and at least two windings, at least two windings are arranged on the iron core, each winding is made of wide thin copper foil, wherein the winding direction of at least two windings is the same, at least two windings are connected in series, and the first end of the first winding and the second end of the last winding of at least two windings are respectively connected to an external circuit. This solution realizes magnetic switching by using wide thin copper foil to make windings and at least two windings are arranged on the iron core. The use of thin copper foil can overcome the skin effect and improve the conduction capacity, and solves the problem that the magnetic switch is difficult to achieve large current due to the use of single-strand or multi-strand enameled wire winding.
[0081] This embodiment discloses a magnetic switch structure, and its structural schematic diagram is shown in FIG. Figure 2 or Figure 3 As shown, including:
[0082] The iron core 21 and the winding 22 .
[0083] In addition to the same structure as the previous embodiment, each turn of each winding segment in this embodiment is insulated and isolated by a film, and the film is made of a single layer or multiple layers of a first insulating material.
[0084] A film is arranged between each turn of the winding to insulate each coil of the winding from the adjacent coils. No matter how many windings there are on the iron core, each winding will have a film arranged between each coil to achieve the purpose of insulation.
[0085] The film may be made of a single layer of the first insulating material, or may be made of multiple layers of the first insulating material. The film may be made of multiple layers of the first insulating material to ensure an insulating effect.
[0086] The first insulating material may be polyurethane or polyimide.
[0087] In addition, since the winding is wound with a wide thin copper foil, when a thin film is set between the turns of each coil of the winding, the width of the film can be set to be wider than the wide thin copper foil to increase the creepage distance. That is, the width of the coil on each section of the winding is certain, and a thin film is set between the turns of the coil to achieve the purpose of insulation. The width of the film needs to be wider than the width of the coil itself, that is, the width of the film is wider than the width of the wide thin copper foil, so as to achieve a better insulation effect and increase the creepage distance.
[0088] The magnetic switch structure disclosed in this embodiment includes: an iron core and at least two windings, at least two windings are arranged on the iron core, each winding is made of wide thin copper foil, wherein the winding direction of at least two windings is the same, at least two windings are connected in series, and the first end of the first winding and the second end of the last winding of at least two windings are respectively connected to an external circuit. This solution realizes magnetic switching by using wide thin copper foil to make windings and at least two windings are arranged on the iron core. The use of thin copper foil can overcome the skin effect and improve the conduction capacity, and solves the problem that the magnetic switch is difficult to achieve large current due to the use of single-strand or multi-strand enameled wire winding.
[0089] This embodiment discloses a magnetic switch structure, and its structural schematic diagram is shown in FIG. Figure 2 or Figure 3 As shown, including:
[0090] The iron core 21 and the winding 22 .
[0091] In addition to the same structure as the previous embodiment, an insulating layer may be added in this embodiment.
[0092] The insulating layer is arranged on the surface of the wide thin copper foil, that is, the wide thin copper foil is covered with the insulating layer to achieve the purpose of insulation directly on the surface of the wide thin copper foil, without the need to wind the wide thin copper foil into a winding and then arrange a film between each turn of the winding to achieve insulation.
[0093] The insulating layer may be realized by means of an insulating film or an insulating varnish, and the insulating film or the insulating varnish may be realized by means of a second insulating material.
[0094] When the insulating layer is realized by means of an insulating film to achieve the purpose of covering a wide thin copper foil, the second insulating material realizing the insulating film can be the same as the first insulating material, that is, the second insulating material at least includes: polyurethane or polyimide.
[0095] The magnetic switch structure disclosed in this embodiment includes: an iron core and at least two windings, at least two windings are arranged on the iron core, each winding is made of wide thin copper foil, wherein the winding direction of at least two windings is the same, at least two windings are connected in series, and the first end of the first winding and the second end of the last winding of at least two windings are respectively connected to an external circuit. This solution realizes magnetic switching by using wide thin copper foil to make windings and at least two windings are arranged on the iron core. The use of thin copper foil can overcome the skin effect and improve the conduction capacity, and solves the problem that the magnetic switch is difficult to achieve large current due to the use of single-strand or multi-strand enameled wire winding.
[0096] Furthermore, it should be noted that insulation isolation can be achieved by using a film between each turn of each winding segment, and the film is made of a single layer or multiple layers of a first insulating material; at the same time, a second insulating material is coated on the surface of a wide thin copper foil to realize an insulating layer.
[0097] The above two methods are used together to achieve insulation isolation between each turn of each winding to ensure the isolation effect and avoid the problem of failure to achieve the insulation effect when one of the insulation methods fails.
[0098] For example, when the film between each turn is damaged, the film cannot achieve the insulation effect. However, due to the existence of the insulating layer covered on the surface of the wide thin copper foil, each turn of the winding is still insulated.
[0099] Alternatively, when the insulating layer covering the surface of the wide thin copper foil is damaged, the insulating layer cannot achieve the insulation effect. However, since the film arranged between each turn of the winding is not damaged, the film arranged between each turn of the winding can still ensure the insulation state between each turn of the winding.
[0100] This embodiment discloses a magnetic switch structure, and its structural schematic diagram is shown in FIG. Figure 2 or Figure 3 As shown, including:
[0101] The iron core 21 and the winding 22 .
[0102] In addition to the same structure as the previous embodiment, in this embodiment, transformer oil can be filled between each turn of each winding segment.
[0103] By filling transformer oil between each turn of the winding, the air gap between the turns of the winding can be removed, so that the turns of the winding are fully filled with transformer oil. This method can improve the high voltage resistance of the magnetic switch, and at the same time, it can also dissipate heat from the iron core and winding in the magnetic switch.
[0104] Among them, the functions of transformer oil are: insulation and heat dissipation, which are mainly caused by differences in molecular density, namely: differences in heat dissipation effects and instantaneous thermal resistance.
[0105] When the transformer oil absorbs the heat of the magnetic switch, the heat of the transformer oil can be dissipated through the heat sink outside the oil tank, thereby achieving the purpose of dissipating the heat of the magnetic switch.
[0106] It should be noted that each turn between each winding section is filled with transformer oil, which can be achieved by immersing the magnetic switch in the transformer oil.
[0107] When the magnetic switch is immersed in transformer oil, the entire magnetic switch can be completely filled with transformer oil, and each turn between each winding section is filled with transformer oil to achieve heat dissipation of the magnetic switch.
[0108] Furthermore, after the magnetic switch is immersed in the transformer oil, a vacuum treatment may be performed to remove the air gaps between each turn in the winding, so that the turns are completely filled with transformer oil.
[0109] The magnetic switch structure disclosed in this embodiment has a compact structure, a higher utilization rate of the iron core window, convenient processing, and easy realization of high voltage and high current; in addition, a single magnetic switch can easily achieve larger switching parameters.
[0110] The magnetic switch structure disclosed in this embodiment includes: an iron core and at least two windings, at least two windings are arranged on the iron core, each winding is made of wide thin copper foil, wherein the winding direction of at least two windings is the same, at least two windings are connected in series, and the first end of the first winding and the second end of the last winding of at least two windings are respectively connected to an external circuit. This solution realizes magnetic switching by using wide thin copper foil to make windings and at least two windings are arranged on the iron core. The use of thin copper foil can overcome the skin effect and improve the conduction capacity, and solves the problem that the magnetic switch is difficult to achieve large current due to the use of single-strand or multi-strand enameled wire winding.
[0111] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0112] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A magnetic switch structure, characterized in that: include: Iron core; At least two windings, the at least two windings are arranged on the iron core, and each winding is wound with a wide thin copper foil; The at least two winding sections have the same winding direction, are connected in series, and the first end of the first winding section and the second end of the last winding section of the at least two winding sections are respectively connected to an external circuit.
2. The structure according to claim 1, characterized in that: The iron core is a square structure.
3. The structure according to claim 2, characterized in that: The cross section of the iron core is square or rectangular.
4. The structure according to claim 2, characterized in that: The at least two winding sections include at least four winding sections respectively wound on four sides of the square structure of the iron core.
5. The structure according to claim 1, characterized in that: Each turn of each winding segment is insulated and isolated by a film, and the film is made of a single layer or multiple layers of a first insulating material.
6. The structure according to claim 5, characterized in that The width of the film is at least greater than the width of the wide-width thin copper foil.
7. The structure according to claim 5, characterized in that The first insulating material at least includes: polyurethane or polyimide.
8. The structure according to claim 1, characterized in that Also includes: The insulating layer is realized by coating the surface of the wide thin copper foil with a second insulating material.
9. The structure according to claim 1, characterized in that Each turn of each winding section is filled with transformer oil.