CN209766212U - Common mode inductor - Google Patents
Common mode inductor Download PDFInfo
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- CN209766212U CN209766212U CN201822136935.9U CN201822136935U CN209766212U CN 209766212 U CN209766212 U CN 209766212U CN 201822136935 U CN201822136935 U CN 201822136935U CN 209766212 U CN209766212 U CN 209766212U
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- common mode
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Abstract
The utility model discloses a common mode inductance. The common mode inductor comprises: a magnet, a first flat coil and a second flat coil; the magnet comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are sequentially connected to form a square shape, the first cylinder and the third cylinder are oppositely arranged, and the second cylinder and the fourth cylinder are oppositely arranged; the first flat coil is arranged on the first cylinder in a surrounding manner, and the second flat coil is arranged on the third cylinder in a surrounding manner; the cross sections of the first cylinder and the third cylinder are square, diamond, circular or oval. The technical scheme of the utility model can reduce common mode inductance's volume, optimize its radiating effect and improve its life-span.
Description
Technical Field
the embodiment of the utility model provides a relate to inductance technical field, especially relate to a common mode inductance.
background
Common mode inductor (Common mode Choke), also called Common mode Choke, is commonly used in a switching power supply of a computer to filter Common mode electromagnetic interference signals.
The common mode inductor is composed of two windings with the same number of turns and opposite winding directions, the existing common mode inductor usually adopts a circular magnet, and a circular copper wire is manually wound on the circular magnet to form the two windings.
However, the common mode inductor wound by using the round copper wire has the disadvantages of large volume, poor heat dissipation effect, short product life and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a common mode inductor to realize reducing common mode inductor's volume, optimize its radiating effect and improve its life-span.
In a first aspect, an embodiment of the present invention provides a common mode inductor, including: a magnet, a first flat coil and a second flat coil;
The magnet comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are sequentially connected to form a square shape, the first cylinder and the third cylinder are oppositely arranged, and the second cylinder and the fourth cylinder are oppositely arranged;
the first flat coil is arranged on the first cylinder in a surrounding manner, and the second flat coil is arranged on the third cylinder in a surrounding manner;
The cross sections of the first cylinder and the third cylinder are square, diamond, circular or oval.
Optionally, only one layer of flat wires is wound around the first cylinder to form the first flat coil, and only one layer of flat wires is wound around the third cylinder to form the second flat coil.
Optionally, the first flat coil and the second flat coil are both circular in surrounding shape.
Optionally, the first flat coil and the second flat coil are both elliptical in surrounding shape.
optionally, the first flat coil and the second flat coil are rectangular in surrounding shape, and four corners of the rectangle are rounded corners.
Optionally, the device further comprises a base, and the base is provided with a clamping groove, an insulating partition plate, a first pin, a second pin and a third pin;
The magnet is fixed on the base through the clamping groove, and the insulating partition plate is positioned between the first flat coil and the second flat coil;
The first pin is electrically connected with the head end of the first flat coil, the tail end of the first flat coil is connected with the head end of the second flat coil, the second pin is electrically connected with the tail end of the second flat coil, and the third pin is grounded.
Optionally, the cross sections of the first column, the second column, the third column and the fourth column are the same.
optionally, the cross sections of the first pin, the second pin and the third pin are all circular or square.
Optionally, the magnet is fixed to the base through the slot, and the flat wires of the first flat coil and the second flat coil are stacked in a direction perpendicular to the plane of the base.
Optionally, the flat wires of the first flat coil and the second flat coil are stacked in a direction parallel to the plane of the base.
The utility model discloses a twine flat line on the magnet in order to form common mode inductance for the shared volume of coil that flat line formed reduces relatively, and it reduces to heat up, does benefit to the heat dissipation simultaneously, thereby has solved the common mode inductance among the prior art because the problem that the volume that uses round copper line to cause is big, the radiating effect is not good and product life is short, has realized reducing the volume, has optimized the radiating effect and has improved the effect in its life-span.
Drawings
Fig. 1 is a schematic structural diagram of a common mode inductor according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a round copper wire and a flat wire according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of a circular copper wire inductor according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of a flat wire inductor according to an embodiment of the present invention;
fig. 5 shows an electric field distribution of a multilayer round copper wire coil and an electric field distribution of a layer of flat wire coil according to an embodiment of the present invention;
fig. 6 is a skin effect of a multilayer round copper wire coil and a skin effect of a layer of flat wire coil according to an embodiment of the present invention;
Fig. 7 shows parasitic capacitances of a multilayer round copper wire coil and a layer of flat wire coil according to an embodiment of the present invention;
fig. 8 is a schematic top view of a common mode inductor according to an embodiment of the present invention;
Fig. 9 is a schematic structural diagram of another common mode inductor according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another common mode inductor according to an embodiment of the present invention;
fig. 11 is a schematic view of an application of a common mode inductor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a common mode inductor provided by an embodiment of the present invention, see and 1, the common mode inductor includes: a magnet 10, a first flat coil 21, and a second flat coil 22; the magnet 10 comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, wherein the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are sequentially connected to form a square shape, the first cylinder and the third cylinder are oppositely arranged, and the second cylinder and the fourth cylinder are oppositely arranged; the first flat coil 21 is arranged on the first column in a surrounding manner, and the second flat coil 22 is arranged on the third column in a surrounding manner; the cross sections of the first cylinder and the third cylinder are square, diamond, circular or oval.
The first cylinder, the second cylinder, the third cylinder and the fourth cylinder are sequentially connected to form the closed magnet 10, so that currents in the first flat coil 21 and the second flat coil 22 form a closed magnetic circuit, the first flat coil 21 and the second flat coil 22 are formed by winding enameled flat wires in an automatic winding mode, the distance between each coil turn and the adjacent coil turn is relatively small, and magnetic leakage is relatively small. In addition, the automatic winding mode is adopted, so that the flat cables of the first flat coil 21 and the second flat coil 22 are crossed and orderly, and the production efficiency is high.
fig. 2 is a schematic cross-sectional view of a round copper wire and a flat wire according to an embodiment of the present invention. The 12 round copper wires are arranged as shown in figure 2, the cross-sectional diameters of the 12 round copper wires are all 3.2mm, and the total cross-sectional area of the 12 round copper wires is about 96.5mm2The cross section of the flat wire is a rectangle with a width of 5mm and a length of 20mm, that is, the cross section of the flat wire is 100mm, and it can be obtained from fig. 2 that, assuming that the cross section area of the common mode inductor formed by winding the round copper wire on the magnet is the same as the cross section area of the common mode inductor formed by winding the flat wire on the magnet, the volume occupied by the flat wire coil is smaller than the volume occupied by the round copper wire coil.
Fig. 3 is a schematic diagram of a round copper wire inductor according to an embodiment of the present invention. Fig. 4 is a schematic diagram of a flat wire inductor according to an embodiment of the present invention. The sectional area, the number of winding turns and the size of the magnet of the round copper wire of the inductor shown in fig. 3 are the same as those of the flat wire of the inductor shown in fig. 4, and it can be seen from fig. 3 and 4 that the flat wire coil in the flat wire inductor is neat in winding displacement, small in occupied volume and fast in heat dissipation. Through tests, when the same current is applied to the round copper wire inductor shown in fig. 3 and the flat wire inductor shown in fig. 4, the temperature rise value of the round copper wire inductor is obviously higher than that of the flat wire inductor in the same time.
Referring to fig. 2-4, it can be seen that, under the same conditions, the volume of the coil can be reduced by replacing the round copper wire with the flat wire, so that the temperature rise is reduced, the heat dissipation effect is improved, and the service life of the common mode inductor is prolonged.
It should be noted that fig. 1 only exemplarily shows that the cross sections of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are all square, but the present application is not limited thereto, and in other embodiments, the cross sections of the first cylinder and the third cylinder may be the same, and the cross sections of the second cylinder and the fourth cylinder may be the same, but the cross sections of the first cylinder and the second cylinder are different.
The embodiment of the utility model provides a common mode inductance is through winding flat wire on the magnet in order to form common mode inductance for the shared volume of coil that flat wire formed reduces relatively, and it reduces to heat up, does benefit to the heat dissipation simultaneously, thereby has solved common mode inductance among the prior art because the problem that the volume that uses round copper line to cause is big, the radiating effect is not good and product life is short, has realized reducing the volume, has optimized the radiating effect and has improved the effect in its life-span.
optionally, only one layer of flat wires is wound around the first cylinder to form the first flat coil, and only one layer of flat wires is wound around the third cylinder to form the second flat coil. The arrangement can avoid the proximity effect and the skin effect generated in the coil between layers, so that the current distribution in the coil is relatively uniform, the parasitic capacitance can be reduced, and the current burrs are eliminated.
the following description will be made with reference to fig. 5-7 for explaining the beneficial effects of winding only one layer of flat wire to form a coil. Fig. 5 shows an electric field distribution of a multilayer round copper wire coil and an electric field distribution of a layer of flat wire coil according to an embodiment of the present invention. Fig. 6 shows the skin effect of a multilayer round copper wire coil and the skin effect of a layer of flat wire coil according to an embodiment of the present invention. Fig. 7 shows parasitic capacitances of a multilayer round copper wire coil and parasitic capacitances of a layer of flat wire coil according to an embodiment of the present invention. As shown in fig. 5, when the cross-sectional area of the round copper wire coil is the same as that of the flat wire coil, the round copper wire coil needs to be wound with three layers of coils, the electric field is non-uniformly distributed, and the local strength is high. In addition, because the round copper wire coil is composed of three layers of round copper wires, the proximity effect and the skin effect are more obvious, so that the current distribution in the round copper wire coil is more uneven, as shown in fig. 6, wherein the black part in the round copper wire represents the non-conductive part and the black part in the flat wire represents the non-conductive part, and it can be obtained according to fig. 6 that the proportion occupied by the actual conductive part of the flat wire is greater than that occupied by the actual conductive part of the round copper wire. Referring to fig. 7, a large amount of complicated distributed capacitance and leakage inductance exist between the windings of the round copper wire coil, and the flat wire coil uniformly disperses an electric field, so that the parasitic capacitance is extremely small, and the elimination of current burrs is facilitated.
Fig. 8 is a schematic top view of a common mode inductor according to an embodiment of the present invention. The first and second flat coils 21 and 22 are circular in their circumferential shape, and this arrangement makes the flow of current in the coils smoother. However, the surrounding shape of the first flat coil 21 and the second flat coil 22 may be other shapes, and alternatively, the surrounding shape of the first flat coil 21 and the second flat coil 22 is an ellipse. Optionally, the surrounding shapes of the first flat coil 21 and the second flat coil 22 are both rectangles, and four corners of each rectangle are rounded.
Fig. 9 is a schematic structural diagram of another common mode inductor according to an embodiment of the present invention. Fig. 10 is a schematic structural diagram of another common mode inductor according to an embodiment of the present invention. Referring to fig. 9 and 10, on the basis of the above technical solution, the common mode inductor further includes a base, and the base is provided with a card slot (not marked in fig. 9 and 10), an insulating spacer 31, a first pin 32, a second pin 33, and a third pin 34; the magnet 10 is fixed on the base through a clamping groove, and the insulating partition plate 31 is positioned between the first flat coil 21 and the second flat coil 22; the first lead 32 is electrically connected to the head end of the first flat coil 21, the tail end of the first flat coil 21 is connected to the head end of the second flat coil 22, the second lead 33 is electrically connected to the tail end of the second flat coil 22, and the third lead 34 is grounded.
Alternatively, referring to fig. 9, the magnet 10 is fixed to the base through the slot, and the direction of the stacked flat wires of the first flat coil 21 and the second flat coil 22 is perpendicular to the plane of the base.
Alternatively, referring to fig. 10, the flat wires of the first flat coil 21 and the second flat coil 22 are stacked in a direction parallel to the plane of the base.
It is understood that the common mode inductor shown in fig. 9 or fig. 10 can be selected according to the practical application of the common mode inductor.
On the basis of the technical scheme, optionally, the cross sections of the first column body, the second column body, the third column body and the fourth column body are the same. The arrangement enables the manufacturing process of the magnet 10 to be relatively simple, and improves the production efficiency.
Optionally, the cross-sections of the first pin 32, the second pin 33 and the third pin 34 are circular or square.
Fig. 11 is a schematic view of an application of a common mode inductor according to an embodiment of the present invention. As shown in fig. 11, the common mode inductor 1 shown in fig. 10 is disposed in the power adapter, and it is understood that the number of turns of the flat coil, the size of the flat wire, and the size of the magnet in the common mode inductor can be set by those skilled in the art according to practical situations, which is not limited in this application.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (9)
1. a common mode inductor, comprising: a magnet, a first flat coil and a second flat coil;
The magnet comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are sequentially connected to form a square shape, the first cylinder and the third cylinder are arranged oppositely, and the second cylinder and the fourth cylinder are arranged oppositely;
The first flat coil is arranged on the first cylinder in a surrounding mode in an automatic winding mode, and the second flat coil is arranged on the third cylinder in a surrounding mode in an automatic winding mode; the first flat coil and the second flat coil are both enameled flat coils;
The cross sections of the first cylinder and the third cylinder are square, rhombic or elliptical;
The first cylinder, the second cylinder, the third cylinder and the fourth cylinder have the same cross section.
2. The common mode inductor of claim 1, wherein only one layer of flat wire is wound around the first post to form the first flat coil, and only one layer of flat wire is wound around the third post to form the second flat coil.
3. the common mode inductor according to claim 1, wherein the first flat coil and the second flat coil are circular in surrounding shape.
4. the common mode inductor according to claim 1, wherein the first flat coil and the second flat coil are both elliptical in their circumferential shape.
5. The common mode inductor according to claim 1, wherein the first flat coil and the second flat coil are rectangular in surrounding shape, and four corners of the rectangle are rounded.
6. the common mode inductor according to any one of claims 1 to 5, further comprising a base, wherein the base is provided with a clamping groove, an insulating partition, a first pin, a second pin and a third pin;
The magnet is fixed on the base through the clamping groove, and the insulating partition plate is positioned between the first flat coil and the second flat coil;
The first pin is electrically connected with the head end of the first flat coil, the tail end of the first flat coil is connected with the head end of the second flat coil, the second pin is electrically connected with the tail end of the second flat coil, and the third pin is grounded.
7. the common mode inductor according to claim 6, wherein the first pin, the second pin and the third pin are all circular or square in cross section.
8. The common mode inductor according to claim 6, wherein the first flat coil and the second flat coil have their flat wires stacked in a direction perpendicular to the plane of the base.
9. The common mode inductor according to claim 6, wherein the first flat coil and the second flat coil have their flat wires stacked in a direction parallel to the plane of the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822136935.9U CN209766212U (en) | 2018-12-19 | 2018-12-19 | Common mode inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822136935.9U CN209766212U (en) | 2018-12-19 | 2018-12-19 | Common mode inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209766212U true CN209766212U (en) | 2019-12-10 |
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ID=68746942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822136935.9U Expired - Fee Related CN209766212U (en) | 2018-12-19 | 2018-12-19 | Common mode inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209766212U (en) |
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2018
- 2018-12-19 CN CN201822136935.9U patent/CN209766212U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191210 Termination date: 20201219 |