CN222300428U - A magnetic switch structure - Google Patents
A magnetic switch structure Download PDFInfo
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- CN222300428U CN222300428U CN202323401502.9U CN202323401502U CN222300428U CN 222300428 U CN222300428 U CN 222300428U CN 202323401502 U CN202323401502 U CN 202323401502U CN 222300428 U CN222300428 U CN 222300428U
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- 238000004804 winding Methods 0.000 claims abstract description 215
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 63
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000011889 copper foil Substances 0.000 claims abstract description 42
- 239000010410 layer Substances 0.000 claims description 16
- 239000011810 insulating material Substances 0.000 claims description 14
- 239000002356 single layer Substances 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000002500 effect on skin Effects 0.000 abstract description 12
- 239000010408 film Substances 0.000 description 21
- 238000009413 insulation Methods 0.000 description 15
- 239000011162 core material Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 6
- 238000002955 isolation Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The application discloses a magnetic switch structure which comprises an iron core and at least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, each section of windings is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and a first end of a first section of winding and a second end of a last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the winding is manufactured by adopting the wide thin copper foil, the magnetic switch is realized by arranging at least two sections of windings on the iron core, the skin effect can be overcome by adopting the thin copper foil, the conduction capacity is improved, and the problem that the magnetic switch is difficult to realize large current due to the fact that single-strand or multi-strand enameled wires are adopted for winding is solved.
Description
Technical Field
The application relates to the field of magnetic switches, in particular to a magnetic switch structure.
Background
At present, the iron core of the magnetic saturation inductor mostly adopts a ring shape, and the coil is wound by single-strand or multi-strand enameled wires. The sectional area of the single-strand enameled wire is limited, and the large current is difficult to realize through even if the multi-strand enameled wire is wound in parallel, and when the current required to pass is extremely large, the multi-strand enameled wire is required to be wound in parallel, and the process is difficult to realize or the processing difficulty is extremely high.
Disclosure of utility model
In view of this, the present application provides a magnetic switch structure, which has the following specific scheme:
A magnetic switch structure comprising:
An iron core;
At least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, and each section of windings is wound by adopting wide thin copper foil;
The winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and the first end of the first section of winding and the second end of the last section of winding in the at least two sections of windings are respectively connected with an external circuit.
Further, the method comprises the steps of,
The iron core is of a square structure.
Further, the method comprises the steps of,
The cross section of the iron core is square or rectangular.
Further, the method comprises the steps of,
The at least two sections of windings at least comprise four sections of windings which are respectively wound on four sides of the square structure of the iron core.
Further, the method comprises the steps of,
The turns of each winding are insulated and isolated by a film, and the film is made of single-layer or multi-layer first insulating materials.
Further, the method comprises the steps of,
The width of the film is at least greater than the width of the wide thin copper foil.
Further, the method comprises the steps of,
The first insulating material at least comprises polyurethane or polyimide.
Further, the method further comprises the following steps:
And the insulating layer is realized by coating a second insulating material on the surface of the wide thin copper foil.
Further, the method comprises the steps of,
And each turn of each winding is filled with transformer oil.
According to the technical scheme, the magnetic switch structure comprises an iron core and at least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, each section of windings is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and a first end of a first section of winding and a second end of a last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the winding is manufactured by adopting the wide thin copper foil, the magnetic switch is realized by arranging at least two sections of windings on the iron core, the skin effect can be overcome by adopting the thin copper foil, the conduction capacity is improved, and the problem that the magnetic switch is difficult to realize large current due to the fact that single-strand or multi-strand enameled wires are adopted for winding is solved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a magnetic switch structure according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a magnetic switch structure according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a magnetic switch structure according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a magnetic switch structure according to an embodiment of the present application;
Fig. 5 is a schematic structural view of a cross section of an iron core of a magnetic switch structure according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a cross section of an iron core of a magnetic switch structure according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application discloses a magnetic switch structure, the structure schematic diagram of which is shown in figure 1, comprising:
The core 11 and at least two windings 12.
At least two sections of windings are arranged on the iron core, and each section of winding is wound by adopting wide thin copper foil.
The winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and the first end of the first section of winding and the second end of the last section of winding in the at least two sections of windings are respectively connected with an external circuit.
The magnetic switch determines the isolation time of the main loop from the trigger loop.
The principle is that based on the nonlinear characteristic of the magnetic material, namely, the direct current voltage is blocked in a certain time, when the magnetic core reaches saturation, the magnetic permeability of the magnetic material is rapidly reduced, and then the inductance is rapidly reduced, so that the magnetic switch is conducted.
The relationship between the saturation time tau of the magnetic switch and the magnetic switch parameter and the external factor is:
Wherein Δb is the variation of magnetic induction intensity in the coil, N k is the number of turns of the coil, and a k is the cross-sectional area of the magnetic core.
ΔB=Br+Bs
Wherein B r is a residual magnetic flux density, and B s is a saturation magnetic flux density.
The design of the magnetic switch needs to meet the above relation, but also needs to meet the condition that the unsaturated inductance L 0 is far larger than the saturated inductance L s, and the saturated inductance L s is very small, so that the magnetic switch has little influence on the original circuit.
The unsaturated inductance of the magnetic switch is:
Where μ 0 is the vacuum permeability, μ τ is the relative permeability, l is the average magnetic path length, and F s is the lamination factor.
Fs＝0.98*(di+dm)
D i is the insulation thickness and d m is the core material thickness.
The saturation inductance of the magnetic switch is:
If a toroidal core is used, the number of cores required is
m=SA
If a single-strand enameled wire or a multi-strand enameled wire is adopted for windings of the magnetic switch, the problem that large current is difficult to pass exists, and when the current required to pass is extremely large, multiple strands of enameled wires are required to be wound in parallel, so that the realization of the technology is difficult or the processing difficulty is high.
In addition, the magnetic switch usually works under extreme working conditions, has extremely high voltage rising rate or falling rate, the outer insulating layer of the enameled wire is usually thinner, the voltage-resistant capability is limited, the inter-turn insulating capability is limited by the outer insulating paint layer, and the inter-turn high voltage is difficult to resist.
The saturable inductor adopted in the high-power magnetic compression high-voltage power supply has the characteristics of large current peak value, high turn-to-turn voltage and the like, and is used for meeting the technical parameter requirements.
Compared with enameled wires, the adoption of the thin copper foil can better overcome skin effect and improve the utilization rate of the iron core window.
The skin effect results in a decrease in the actual flow area, i.e. an additional increase in impedance at high frequencies, increasing losses, the higher the frequency the more pronounced the skin effect. In order to pass a large current, an enameled wire is adopted, so that the path needs to be designed to be thicker, but the path still can be influenced by skin effect, and the circulation capacity is reduced. And the influence of skin effect can be avoided by adopting the thin copper foil.
At least two sections of windings are arranged on the iron core, the winding directions of the windings of each section are the same, and clockwise or anticlockwise winding can be adopted.
The at least two sections of windings are connected in series, and the first end of the first section of winding and the second end of the last section of winding in the at least two sections of windings are respectively connected with an external circuit.
The starting end of each section of winding can be set as a first end, namely the head of the section of winding, the ending end of each section of winding is set as a second end, namely the tail of the section of winding, each section of winding starts to be wound from the outer side of the front view of the iron core, and the tail is also positioned at the outer side of the front view of the iron core.
The number of the windings can be set as 1, 2, 3, 4, etc., except the head of the winding 1, i.e. the first end of the winding at the first end, and the tail of the winding at the last section, i.e. the second end of the winding at the last section, the other windings are all set as adjacent winding heads and tail connections, i.e. the tail of the winding 1 is connected with the head of the winding 2, the tail of the winding 2 is connected with the head of the winding 3, and so on, so as to realize the series connection of the windings.
Further, the number of turns of different windings in the same magnetic switch structure may be set to be the same.
The magnetic switch structure comprises an iron core and at least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, each section of windings is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and a first end of a first section of winding and a second end of a last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the winding is manufactured by adopting the wide thin copper foil, the magnetic switch is realized by arranging at least two sections of windings on the iron core, the skin effect can be overcome by adopting the thin copper foil, the conduction capacity is improved, and the problem that the magnetic switch is difficult to realize large current due to the fact that single-strand or multi-strand enameled wires are adopted for winding is solved.
The embodiment discloses a magnetic switch structure, the schematic diagram of which is shown in fig. 2, comprising:
The core 21 and at least two windings 22.
Here, the core 21 in the present embodiment may have a square structure, except for the same structure as the previous embodiment.
When the iron core is of a square structure, the at least two sections of windings can be four sections of windings respectively wound on four sides of the square structure of the iron core, namely, one section of winding is arranged 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.
As shown in fig. 3, the winding comprises an iron core 21 and windings 22, wherein the windings 22 are four sections, are respectively arranged on four sides of the iron core, are connected in series, and are connected in a head-tail mode and a tail-tail mode except for a first end of a first section of winding and a second end of a last section of winding.
The numbers of the windings can be set, for example, the numbers are sequentially 1,2, 3 and 4, and as shown in fig. 3, the first end of the winding No. 1 is A1, the second end of the winding No. 1 is X1, the first end of the winding No. 2 is A1, the second end of the winding No. 2 is X2, the first end of the winding No. 3 is A3, the second end of the winding No. 3 is X3, the first end of the winding No. 4 is A4, and the second end of the winding No. 4 is X4.
Wherein, A1 and X4 are respectively connected with external circuit, X1 is connected with A2, X2 is connected with A3, X3 is connected with A4, realize the series connection of 4 sections of windings.
4 Sections of windings are connected in series, so that the iron core and the window can be fully utilized, the filling rate is improved, and the cost is reduced.
In fig. 3, that is, the front view of the magnetic switch structure, when winding, winding is performed with reference to the front view shown in fig. 3, and winding is started from the outer side of the front view of the iron core shown in fig. 3, the head of each section of winding is located at the outer side of the front view of the iron core, and the tail of each section of winding is also located at the outer side of the front view of the iron core.
Or 4 sections of windings even if not arranged in series can realize the function of a magnetic switch, solves the problem that the magnetic switch is difficult to realize large current caused by adopting single-strand or multi-strand enameled wire winding, and comprises: the iron core 21 and the winding 22, the winding 22 is four sections, set up on four sides of iron core respectively, the first end and the second end of every section winding are all not connected with other windings, but the first end of first section winding and the second end of last section winding still are connected with external circuit, and the head-to-tail connection of other windings is magnetic switch internal connection.
Further, the cross section of the iron core can be square, rectangular or R-shaped. Whatever the shape of the cross section of the core, this does not affect the square structure formed by the core.
The section of the iron core is designed into a square shape or a rectangular shape or an R shape, meanwhile, the copper foil is adopted for the winding instead of the enameled wire, and the winding terminal is conveniently led out by adopting the design.
As shown in fig. 5, a schematic cross-sectional view of an iron core of a magnetic switch structure includes an iron core 21 and windings 22, wherein the cross-section of the iron core 21 shown in fig. 5 is square, and the cross-section of each winding is square;
As shown in fig. 6, a schematic cross-sectional view of an iron core with a magnetic switch structure includes an iron core 21 and windings 22, wherein the cross-section of the iron core 21 shown in fig. 6 is rectangular, and the cross-section of each winding is rectangular;
in addition, the cross section of the core may be of other shapes, which will not be described in detail herein.
The magnetic switch structure comprises an iron core and at least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, each section of windings is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and a first end of a first section of winding and a second end of a last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the winding is manufactured by adopting the wide thin copper foil, the magnetic switch is realized by arranging at least two sections of windings on the iron core, the skin effect can be overcome by adopting the thin copper foil, the conduction capacity is improved, and the problem that the magnetic switch is difficult to realize large current due to the fact that single-strand or multi-strand enameled wires are adopted for winding is solved.
The embodiment discloses a magnetic switch structure, the schematic structural diagram of which is shown in fig. 2 or fig. 3, comprising:
iron core 21 and winding 22.
Except for the same structure as the previous embodiment, each turn-to-turn of each winding is insulated and isolated by a film made of a single layer or multiple layers of a first insulating material.
A film is provided between turns of each turn of the winding to achieve insulation between each turn of the winding and the adjacent coil. A plurality of windings are arranged on the iron core, and each winding is provided with a film between each coil turn, so that the purpose of insulation is achieved.
The film can be made of a single layer of first insulating material, can also be made of multiple layers of first insulating materials, and can ensure the insulating effect.
The first insulating material may be polyurethane or polyimide.
In addition, because the winding is formed by winding wide thin copper foil, when a film is arranged between turns of each turn of the winding, the width of the film can be set to be wider than that of the wide thin copper foil so as to increase the creepage distance. The width of the coil on each section of winding is fixed, and the film is arranged between turns of the coil to achieve the purpose of insulation, so that the width of the film is required to be wider than the width of the coil, namely the width of the film is wider than the width of the wide thin copper foil, thereby achieving better insulation effect and increasing creepage distance.
The magnetic switch structure comprises an iron core and at least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, each section of windings is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and a first end of a first section of winding and a second end of a last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the winding is manufactured by adopting the wide thin copper foil, the magnetic switch is realized by arranging at least two sections of windings on the iron core, the skin effect can be overcome by adopting the thin copper foil, the conduction capacity is improved, and the problem that the magnetic switch is difficult to realize large current due to the fact that single-strand or multi-strand enameled wires are adopted for winding is solved.
The embodiment discloses a magnetic switch structure, the schematic structural diagram of which is shown in fig. 2 or fig. 3, comprising:
iron core 21 and winding 22.
In addition to the same structure as the previous embodiment, an insulating layer may be added in this embodiment.
The insulating layer is arranged on the surface of the wide thin copper foil, namely the wide thin copper foil is coated by the insulating layer, so that the purpose of directly insulating the surface of the wide thin copper foil is achieved, the wide thin copper foil is not required to be wound into a winding, and a film is arranged between each turn of the winding to realize insulation.
The insulating layer can be realized by an insulating film or insulating paint, and the insulating film or insulating paint can be realized by a second insulating material.
When the insulating layer is realized in the manner of an insulating film and the purpose of coating the wide thin copper foil is achieved, the second insulating material for realizing the insulating film can be the same as the first insulating material, namely, the second insulating material at least comprises polyurethane or polyimide.
The magnetic switch structure comprises an iron core and at least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, each section of windings is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and a first end of a first section of winding and a second end of a last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the winding is manufactured by adopting the wide thin copper foil, the magnetic switch is realized by arranging at least two sections of windings on the iron core, the skin effect can be overcome by adopting the thin copper foil, the conduction capacity is improved, and the problem that the magnetic switch is difficult to realize large current due to the fact that single-strand or multi-strand enameled wires are adopted for winding is solved.
Furthermore, the insulation isolation can be performed by a film between turns of each winding, the film is made of single-layer or multi-layer first insulation materials, and meanwhile, the surface of the wide thin copper foil is coated with a second insulation material to realize an insulation layer.
The insulation isolation between each turn of the coil of each section of winding is realized jointly through the two modes, so that the isolation effect is ensured, and the problem that the insulation effect cannot be achieved when a certain insulation mode fails is avoided.
For example, when the film arranged between turns of each turn is damaged, the film cannot achieve the insulation effect, but each turn of the coil is still in an insulation state due to the existence of the insulation layer coated on the surface of the wide thin copper foil;
Or when the insulating layer coated on the surface of the wide thin copper foil is damaged, the insulating layer cannot achieve the insulating effect, but because the thin film arranged between each turn of the winding is not damaged, the thin film arranged between each turn of the winding can still ensure the insulating state between each turn of the winding.
The embodiment discloses a magnetic switch structure, the schematic structural diagram of which is shown in fig. 2 or fig. 3, comprising:
iron core 21 and winding 22.
In addition to the same structure as the previous embodiment, the present embodiment may be filled with transformer oil between turns of each winding segment.
And each turn of the winding is filled with transformer oil, so that air gaps among turns in the winding can be removed, and the turns of the winding are fully filled with the transformer oil. By adopting the mode, the high voltage resistance of the magnetic switch can be improved, and meanwhile, the iron core and the winding in the magnetic switch can be radiated.
The transformer oil has the functions of insulation and heat dissipation, and is mainly caused by the difference of molecular densities, namely, the difference of heat dissipation effects and the difference of instantaneous thermal resistance.
After the transformer oil absorbs the heat of the magnetic switch, the heat dissipation of the transformer oil can be realized through the external heat dissipation fins of the oil tank, so that the purpose of heat dissipation of the magnetic switch is realized.
The inter-turn of each winding is filled with transformer oil, and can be achieved by immersing the magnetic switch in transformer oil.
When the magnetic switch is immersed in transformer oil, the whole magnetic switch can be completely filled with the transformer oil, and each turn of each section of winding is filled with the transformer oil, so that heat dissipation of the magnetic switch is realized.
Furthermore, after the magnetic switch is immersed in transformer oil, vacuumizing treatment can be performed to remove air gaps among turns of each turn in the winding, so that the purpose that the turns are completely filled with the transformer oil is achieved.
The magnetic switch structure disclosed by the embodiment has the advantages of compact structure, higher window utilization rate of the iron core, convenience in processing and easiness in realizing high-voltage and high-current, and in addition, a single magnetic switch can easily realize larger switch parameters.
The magnetic switch structure comprises an iron core and at least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, each section of windings is made of wide thin copper foil, the winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and a first end of a first section of winding and a second end of a last section of winding in the at least two sections of windings are respectively connected with an external circuit. According to the scheme, the winding is manufactured by adopting the wide thin copper foil, the magnetic switch is realized by arranging at least two sections of windings on the iron core, the skin effect can be overcome by adopting the thin copper foil, the conduction capacity is improved, and the problem that the magnetic switch is difficult to realize large current due to the fact that single-strand or multi-strand enameled wires are adopted for winding is solved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A magnetic switch structure, comprising:
An iron core;
At least two sections of windings, wherein the at least two sections of windings are arranged on the iron core, and each section of windings is wound by adopting wide thin copper foil;
The winding directions of the at least two sections of windings are the same, the at least two sections of windings are connected in series, and the first end of the first section of winding and the second end of the last section of winding in the at least two sections of windings are respectively connected with an external circuit.
2. The structure of claim 1, wherein,
The iron core is of a square structure.
3. The structure of claim 2, wherein,
The cross section of the iron core is square or rectangular.
4. The structure of claim 2, wherein,
The at least two sections of windings at least comprise four sections of windings which are respectively wound on four sides of the square structure of the iron core.
5. The structure of claim 1, wherein,
The turns of each winding are insulated and isolated by a film, and the film is made of single-layer or multi-layer first insulating materials.
6. The structure of claim 5, wherein,
The width of the film is at least greater than the width of the wide thin copper foil.
7. The structure of claim 5, wherein,
The first insulating material at least comprises polyurethane or polyimide.
8. The structure of claim 1, further comprising:
And the insulating layer is realized by coating a second insulating material on the surface of the wide thin copper foil.
9. The structure of claim 1, wherein,
And each turn of each winding is filled with transformer oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323401502.9U CN222300428U (en) | 2023-12-13 | 2023-12-13 | A magnetic switch structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323401502.9U CN222300428U (en) | 2023-12-13 | 2023-12-13 | A magnetic switch structure |
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| CN222300428U true CN222300428U (en) | 2025-01-03 |
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| CN202323401502.9U Active CN222300428U (en) | 2023-12-13 | 2023-12-13 | A magnetic switch structure |
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