CN212084819U - Flat wire wireless charging coil and wireless charging equipment - Google Patents
Flat wire wireless charging coil and wireless charging equipment Download PDFInfo
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- CN212084819U CN212084819U CN202020052505.3U CN202020052505U CN212084819U CN 212084819 U CN212084819 U CN 212084819U CN 202020052505 U CN202020052505 U CN 202020052505U CN 212084819 U CN212084819 U CN 212084819U
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Abstract
The application discloses flat line wireless charging coil and wireless charging equipment. The coil comprises a magnetic shielding component and a coil formed by winding one or more strands of flat wires; the first ends of the one or more strands of flat wires are connected together to form a first leading-out end of the coil, and the second ends of the one or more strands of flat wires are connected together to form a second leading-out end of the coil; the coil is positioned on the magnetic shielding component and is bonded with the magnetic shielding component through bonding; the width direction of the one or more strands of flat wires is parallel to the magnetic shielding component; the flat wire or the flat wires are stacked layer by layer in the direction parallel to the magnetic shielding component, and two adjacent turns of wires are tightly attached together. Compared with the electrical performance of the coil wound by the round copper wire and the flat wire, the influence of different winding strands on the electrical performance of the coil is reduced. The alternating current resistance of the coil can be reduced, and therefore loss caused by the coil is reduced.
Description
Technical Field
The application relates to the technical field of wireless charging, in particular to a flat wire wireless charging coil and wireless charging equipment.
Background
The common wireless charging principle is mainly based on electromagnetic induction, near-field coupling and electromagnetic wave conduction. Electromagnetic induction is the transfer of energy from a transmitting end to a receiving end by passing an alternating current through a primary, a changing electric field producing a changing magnetic field, and a magnetic field producing an induced current through a coil of a coupled secondary. The difference between the near field coupling technology which adopts a matched resonant antenna and captures the electromagnetic field attenuated along with the distance by using two circuits generating resonant coupling is that when the transmitting loop and the receiving loop resonate, most energy can be transferred to the receiving loop from the transmitting loop. Electromagnetic wave conduction is that radio wave can carry energy and transfer energy, and when the radio wave propagates through space to reach a receiving end, electromagnetic field changes caused by the radio wave generate a resonance effect, and current can be generated in a conductor.
In the wireless charging system of the mobile phone, a receiving coil receives electromagnetic energy emitted by a transmitting end in a resonance or electromagnetic induction mode, and the electromagnetic energy is converted into voltage or current which can be used by a load through a corresponding circuit. Because terminal products such as mobile phones and the like have high use strength and have higher and higher requirements on charging speed, the transmitting power and the receiving power of a wireless charging system must be correspondingly improved, and the transmission efficiency between the wireless charging system and the wireless charging system is also a key point of attention. The traditional wireless receiving coil that charges generally adopts one or stranded round copper line, stranded conductor coiling forms, though can realize wireless effect of charging, can reach the effect of increase inductance value through increase strand number or coiling number of turns, but also have some shortcomings, range between round wire and the round wire, will increase the clearance between the copper line, make the resistance of coil increase, and use stranded conductor coiling coil, because the instability of strand number, can influence the stability that the coil was arranged, thereby the alternating current who makes the coil takes place very big change.
The above background disclosure is only for the purpose of assisting in understanding the inventive concepts and technical solutions of the present application and does not necessarily pertain to the prior art of the present application, and should not be used to assess the novelty and inventive step of the present application in the absence of explicit evidence to suggest that such matter has been disclosed at the filing date of the present application.
SUMMERY OF THE UTILITY MODEL
The application provides a flat wire wireless charging coil and wireless charging equipment, the alternating current resistance of reducible coil to reduce the loss that the coil brought.
In a first aspect, the present application provides a flat wire wireless charging coil, including a magnetic shielding component and a coil wound by one or more strands of flat wires;
the first ends of the one or more strands of flat wire are connected together to form a first exit end of the coil;
the second ends of the one or more strands of flat wire are connected together to form a second outlet end of the coil;
the coil is positioned on the magnetic shielding component and is bonded with the magnetic shielding component through bonding;
the width direction of the one or more strands of flat wires is parallel to the magnetic shielding component;
the flat wire or the flat wires are stacked layer by layer in the direction parallel to the magnetic shielding component, and two adjacent turns of wires are tightly attached together.
In some preferred embodiments, the material form of the magnetic shield member includes ferrite material, nanocrystalline material and amorphous material.
In some preferred embodiments, the shape of the magnetic shield member includes a circle, a square, an ellipse, a regular polygon and a polygonal irregularity.
In some preferred embodiments, the dimensions of the magnetic shield member are: the thickness is 0.02 mm-4.0 mm, the length is 4 mm-200 mm, and the width is 4 mm-200 mm.
In some preferred embodiments, the coil is wound from three flat strands of wire.
In some preferred embodiments, the specific forms of the inner and outer shapes of the coil include a circle, a square, an ellipse, and a racetrack shape.
In some preferred embodiments, the gauge of the flat wire comprises 0.11 x 0.4mm, 0.11 x 0.6mm, and 0.11 x 1.2 mm.
In some preferred embodiments, the flat wire is a flat copper wire.
In some preferred embodiments, the flat copper wire comprises a copper core, an insulating layer and a self-adhesive layer.
In some preferred embodiments, the self-adhesive layer can be self-adhesive upon heating or addition of a solvent.
In a second aspect, the present application provides a wireless charging device comprising the above flat wire wireless charging coil.
Compared with the prior art, the beneficial effect of this application has:
the coil is wound by using the flat wire, and the coil and the magnetic shielding component are bonded together, so that the magnetic shielding space can be well utilized, the gap between the wires can be reduced, the space between the wires can be fully utilized to reduce the alternating current resistance of the coil, and the loss caused by the coil is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a flat wire wireless charging coil according to an embodiment of the present application;
FIG. 2 shows a cross-section of a round wire wound wireless charging coil;
FIG. 3 shows a cross-section of a flat wire wound wireless charging coil;
fig. 4 is a schematic structural diagram of a flat wire wireless charging coil according to experimental example 1 of the present application;
FIG. 5 shows a cross section of 1 flat wire of Experimental example 1 of the present application;
fig. 6 is a schematic structural diagram of a flat wire wireless charging coil according to experimental example 2 of the present application;
FIG. 7 shows a cross section of 2 flat wires of Experimental example 2 of the present application;
fig. 8 is a schematic structural diagram of a flat wire wireless charging coil according to experimental example 3 of the present application;
FIG. 9 shows a cross section of 3 flat wires of Experimental example 3 of the present application;
fig. 10 is a schematic structural view of a round wire wireless charging coil of a comparative example;
fig. 11 shows a cross section of 11 round wires of the comparative example.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the embodiments of the present application more clearly apparent, the present application is further described in detail below with reference to fig. 1 to 11 and the embodiments. It should be emphasized here that the following example is only for better illustration of one example of the content of the application, and is not intended to limit the scope of the application and its application. It should be appreciated by those skilled in the art that the conception and specific embodiment described may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present application, and that the conception and specific embodiment may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present application without departing from the spirit and scope of the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element. The connection may be for fixation or for circuit connection.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description of the embodiments and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 and 2, the present embodiment provides a flat wire wireless charging coil, including a magnetic shield member 1 and a coil 2. The coil 2 is located above the magnetic shield member 1 and bonded to the magnetic shield member 1 by an adhesive 3.
The magnetic shielding component 1 is made of magnetic shielding materials, including ferrite materials, nanocrystalline materials and amorphous materials. The shape of the magnetic shield member 1 may be a planar shape such as a circle, a square, an ellipse, a regular polygon or a polygonal irregularity, the thickness may be 0.02mm to 4.0mm, the length may be 4mm to 200mm, and the width may be 4mm to 200 mm.
The adhesive 3 may be glue, liquid mixture and tape. The shape of the adhesive 3 may be the same as that of the magnetic shield member 1. The wound coil 2 and the magnetic shielding material 1 form the flat wire wireless charging coil in a mode of pressing or attaching the adhesive 3.
Referring to fig. 4, 6 and 8, the coil 2 is wound from one or more flat wires 4; wherein, the wire diameters of the multi-strand flat wires 4 can be different. The flat wire 2 is square in cross section. The flat wire 2 is made of copper, specifically, a flat copper wire. The flat copper wire comprises a copper core, an insulating layer and a self-adhesive layer. The self-adhesive layer can be self-adhesive, i.e. has self-adhesive properties, when heated or with the addition of a solvent.
Each flat wire 4 has a first end and a second end. Referring to fig. 4, first ends of one or more strands of flat wire 4 are connected together to form a first exit 21 of the coil 2. The second ends of the one or more flat wires are connected together to form a second exit 22 of the coil 2. Referring to fig. 3, the plurality of flat wires are arranged in parallel, for example, the plurality of flat wires are horizontally arranged, and the shape is still flat. The flat wires can be bonded together by heat bonding.
Referring to fig. 4 and 5, when the coil 2 is wound, the width direction of the flat wire 4 is made parallel to the magnetic shield member 1. One or more flat wires 4 are stacked layer by layer in a direction parallel to the magnetic shield member 1, and adjacent two turns of the wire are closely attached together, thereby forming the coil 2. That is, the flat wire 4 is wound from inside to outside.
The inner and outer shapes of the coil 2 may be circular, square, elliptical, racetrack, etc. planar shapes.
The embodiment also provides a winding method of the flat wire wireless charging coil, which comprises the step A1 and the step A2.
Step A1, connecting the first ends of one or more flat wires 4 in parallel to form a first leading-out end 21 of the coil 2, winding the parallel flat wires into a coil with a certain inner diameter and outer diameter by heating or adding solvent, and connecting the second ends of one or more flat wires in parallel to form a second leading-out end 22 of the coil.
When the coil is wound, the width direction of the flat wire 4 is made parallel to the magnetic shield member 1, and the flat wire 4 is stacked layer by layer in a direction parallel to the magnetic shield member 1 to form the coil 2.
Step a2 is to bond the coil 2 obtained in step a1 to the magnetic shield member 1 with an adhesive 3, thereby manufacturing a wireless charging coil.
The flat wire wireless charging coil of the embodiment can further comprise other adhesive tapes for fixing the module, and auxiliary components such as a heat conducting component and the like.
The flat wire wireless charging coil of this embodiment may be an FPC (Flexible Printed Circuit) coil made by printing.
According to the calculation formula of the direct current resistance R: where ρ is the resistivity of the wire, L is the winding length of the coil, and S is the cross-sectional area of the conductor. When the inner and outer dimensions of the coil and the number of winding turns are fixed, if too much space is left between the wires without filling, the sectional area of the conductor is smaller, the direct current resistance is large, and the alternating current resistance is also larger. This embodiment uses one strand or stranded flat line coiling wireless charging coil, arranges through the zero clearance between the flat line and reduces the direct current resistance of coil, bonds coil and magnetism shielding part together, can utilize magnetism shielding space well to reduce the alternating current resistance of coil, can improve the charge efficiency of coil.
This example is illustrated by experimental examples and comparative examples.
Experimental example 1
Refer to fig. 4 and 5. 1 strand of flat copper wire with the thickness of 0.11mm and the width of 1.2mm is selected and wound into a coil 2 of a figure 4, and then the coil 2 and the magnetic shielding component 1 are bonded together by a bonding material 3 to form the flat wire wireless charging coil. The magnetic shield member 1 is a magnetic shield plate, specifically a rectangular ferrite magnetic plate of 51mm X51 mm. And (3) carrying out an electrical test on the flat wire wireless charging coil in the experimental example 1. The electrical property test contents comprise inductance Ls, quality factor Q, direct current resistance DCR and alternating current resistance ACR of the finished product. The test results are shown in Table I.
Experimental example 2
Refer to fig. 6 and 7. 2 strands of flat copper wires with the thickness of 0.11mm and the width of 0.6mm are selected and wound into the coil 2 of the figure 6, and then the coil 2 and the magnetic shielding component 1 are bonded together through the adhesive 3 to form the flat wire wireless charging coil. The magnetic shield member 1 is a magnetic shield plate, specifically a rectangular ferrite magnetic plate of 51mm X51 mm. And (3) carrying out an electrical test on the flat wire wireless charging coil in the experimental example 2. The electrical property test contents comprise inductance Ls, quality factor Q, direct current resistance DCR and alternating current resistance ACR of the finished product. The test results are shown in Table I.
Experimental example 3
Refer to fig. 8 and 9. 3 strands of flat copper wires with the thickness of 0.11mm and the width of 0.4mm are selected and wound into the coil 2 of the figure 8, and then the coil 2 and the magnetic shielding component 1 are bonded together through the adhesive 3 to form the flat wire wireless charging coil. The magnetic shield member 1 is a magnetic shield plate, specifically a rectangular ferrite magnetic plate of 51mm X51 mm. And (3) carrying out an electrical test on the flat wire wireless charging coil in the experimental example 3. The electrical property test contents comprise inductance Ls, quality factor Q, direct current resistance DCR and alternating current resistance ACR of the finished product. The test results are shown in Table I.
Comparative example
Refer to fig. 10 and 11. The round wire wireless charging coil of the comparative example includes a magnetic shield member 600, a coil 601 made of round wire, and an adhesive 602 bonding the coil and the magnetic shield member 600. The magnetic shield member 600 is a rectangular ferrite magnetic plate 51mm by 51 mm. The coil 601 of fig. 6 is wound by using 11 strands of round copper wires with the wire diameter of 0.11mm, and then the coil 601 and the magnetic shielding component 600 are bonded together by using an adhesive 602 to form the wireless charging coil. And carrying out electrical test on the coil. The electrical property test content comprises the inductance Ls, the quality factor Q, the direct current resistance DCR and the alternating current resistance ACR of the finished product. The test results are shown in Table I.
The coil wound by the round wire of the comparative example is a standard product and is used for comparison with the flat wire wireless charging coil of the embodiment.
TABLE test results of Experimental examples and comparative examples
By testing the electrical property of the coils, it can be obviously seen that the inductance Ls of the 4 coils are relatively close; the quality factor Q of the flat wire increases with the number of strands, the ac resistance ACR decreases with the number of strands, and the quality factor Q and the ac resistance ACR of the circular wire coil are similar to those of the 0.11 × 0.6 flat wire coil, that is, experimental example 2. For the test efficiency (maximum transmission efficiency), the efficiency of 3 flat wire coils increases with the increase of the number of strands, the coil efficiency of 1 strand and 2 strand flat wires is lower than that of a multi-strand round wire coil, and the efficiency of the 3 strand flat wire coil is equivalent to that of a round wire. Referring to fig. 2 and fig. 3, the flat wire wireless charging coil of this embodiment can better utilize magnetic shielding space than the round wire wireless charging coil, and the space between reducible line and the line can make full use of the space between line and the line to reduce the alternating current resistance of coil to reduce the loss that the coil brought, promoted wireless charging coil's efficiency.
The embodiment also provides a wireless charging device, which comprises the flat wire wireless charging coil. The wireless charging device may be a charging cradle or a mobile terminal.
The foregoing is a further detailed description of the present application in connection with specific/preferred embodiments and is not intended to limit the present application to that particular description. For a person skilled in the art to which the present application pertains, several alternatives or modifications to the described embodiments may be made without departing from the concept of the present application, and these alternatives or modifications should be considered as falling within the scope of the present application.
Claims (10)
1. The utility model provides a flat line wireless charging coil which characterized in that: comprises a magnetic shielding component and a coil formed by winding one or more strands of flat wires;
the first ends of the one or more strands of flat wire are connected together to form a first exit end of the coil;
the second ends of the one or more strands of flat wire are connected together to form a second outlet end of the coil;
the coil is positioned on the magnetic shielding component and is bonded with the magnetic shielding component through bonding;
the width direction of the one or more strands of flat wires is parallel to the magnetic shielding component;
the flat wire or the flat wires are stacked layer by layer in the direction parallel to the magnetic shielding component, and two adjacent turns of wires are tightly attached together.
2. The flat-wire wireless charging coil according to claim 1, wherein: the material forms of the magnetic shielding component comprise ferrite materials, nanocrystalline materials and amorphous materials.
3. The flat-wire wireless charging coil according to claim 1, wherein: the shape of the magnetic shield member includes a circle, a square, an ellipse, a regular polygon and a polygonal irregularity.
4. The flat-wire wireless charging coil according to claim 1, wherein: the dimensions of the magnetic shield member are: the thickness is 0.02 mm-4.0 mm, the length is 4 mm-200 mm, and the width is 4 mm-200 mm.
5. The flat-wire wireless charging coil according to claim 1, wherein: the coil is formed by winding three strands of flat wires.
6. The flat-wire wireless charging coil according to claim 1, wherein: the specific forms of the inner and outer shapes of the coil comprise a circle, a square, an ellipse and a runway shape; the gauge of the flat wire includes 0.11 x 0.4mm, 0.11 x 0.6mm, and 0.11 x 1.2 mm.
7. The flat-wire wireless charging coil according to claim 1, wherein: the flat wire is a flat copper wire.
8. The flat-wire wireless charging coil of claim 7, wherein: the flat copper wire comprises a copper core, an insulating layer and a self-adhesive layer.
9. The flat-wire wireless charging coil of claim 8, wherein: the self-adhesive layer can realize self-adhesion under the condition of heating or adding a solvent.
10. A wireless charging device, characterized in that: the flat wire wireless charging coil according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020052505.3U CN212084819U (en) | 2020-01-10 | 2020-01-10 | Flat wire wireless charging coil and wireless charging equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020052505.3U CN212084819U (en) | 2020-01-10 | 2020-01-10 | Flat wire wireless charging coil and wireless charging equipment |
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| CN212084819U true CN212084819U (en) | 2020-12-04 |
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| CN202020052505.3U Active CN212084819U (en) | 2020-01-10 | 2020-01-10 | Flat wire wireless charging coil and wireless charging equipment |
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