CN215956124U - Wireless charger and charging coil structure thereof - Google Patents
Wireless charger and charging coil structure thereof Download PDFInfo
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- CN215956124U CN215956124U CN202120609188.5U CN202120609188U CN215956124U CN 215956124 U CN215956124 U CN 215956124U CN 202120609188 U CN202120609188 U CN 202120609188U CN 215956124 U CN215956124 U CN 215956124U
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Abstract
The utility model discloses a wireless charger and a charging coil structure thereof. The charging coil structure comprises a magnetic isolation sheet, wherein a plurality of transmitting coils are arranged on the magnetic isolation sheet, the transmitting coils are overlapped in an at least two-layer crossing mode, and each transmitting coil is at least intersected with two transmitting coils at the same time. According to the utility model, through the crossed and overlapped coil structure, the electronic terminal can be effectively charged no matter the electronic terminal is placed on a wireless charger component during charging, so that the intelligent charging positioning is realized, the coil crossed arrangement mode is also beneficial to increasing the charging area, and the problem of difficult alignment of the traditional wireless charging can be solved.
Description
Technical Field
The utility model relates to wireless charging equipment, in particular to a wireless charger and a charging coil structure thereof.
Background
The wireless charger charges the electronic terminal by using an electromagnetic induction technology, does not need a power line, depends on electromagnetic wave propagation, converts electromagnetic wave energy into electric energy, and finally realizes wireless charging.
The existing wireless charger generally can only charge one electronic terminal at a time, and a multi-coil tiled structure can be adopted for achieving the purposes of simultaneously charging a plurality of terminals and freely discharging the electronic terminals by the wireless charger.
As shown in fig. 1, in the conventional charging coil structure, a monocoil has an inner diameter of 5mm and an outer diameter of 40mm, and the coil has a small inner diameter, and generally adopts a layer of tiled structure, and adjacent coils are arranged closely, and after a charger is powered on, a current flows through the coil and generates an induction magnetic field around the coil, and because the directions of magnetic lines of magnetic force of magnetic fields of adjacent wires are opposite (as shown in fig. 2), a magnetic field blind area in an area from the outside to the inside (as shown in fig. 1) of the coil R is caused. In other words, in the region from the outer diameter to the inner diameter of the coil, the magnetic fields generated by the coil cancel each other out, and the larger the region is, the larger the blind area of the coil is, and the charging efficiency is low.
Part wireless charger adopts two-layer laminated structure, and the coil turn number of every layer coil is all the same, because each layer coil is different from the distance of magnetic isolation piece, this can cause the actual sense of upper and lower floor's coil to be different, causes each layer coil uniformity not good, causes the difficulty for wireless charging power transmission control.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, the utility model aims to provide a wireless charger and a charging coil structure thereof, which can improve the wireless charging efficiency and the intelligent charging positioning.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a charging coil structure of a wireless charger comprises a magnetic shielding sheet, wherein a plurality of transmitting coils are arranged on the magnetic shielding sheet, the transmitting coils are overlapped in a crossed manner according to at least two layers, and each transmitting coil is at least intersected with two transmitting coils simultaneously; the inductance value of transmitting coil diminishes to the upper strata by the lower floor in proper order, and each transmission is the same through the external diameter of circle, the internal diameter from the top down reduces in proper order, makes magnetic field intensity diminish from last to down in proper order.
As a refinement of the utility model, the transmitting coils are laid in more than three layers, and each transmitting coil intersects at least three coils at the same time.
As an improvement of the utility model, the outer diameter of the transmitting coil is 2-4 times of the inner diameter.
As a further improvement of the utility model, the transmitter coils are arranged in three rows, each row of transmitter coils being arranged uniformly.
As a further improvement of the utility model, the transmitting coils of the first row are arranged symmetrically with respect to the third row, and the transmitting coils of the second row intersect the transmitting coils at the periphery thereof.
As a further improvement of the utility model, the number of the transmitting coils of the middle layer and the lower layer is 7, and the number of the transmitting coils of the upper layer is 8.
As a further improvement of the utility model, the number of the transmitting coils at the upper layer and the middle layer is 6, and the number of the transmitting coils at the lower layer is 7.
As a further improvement of the utility model, the transmitting coils of each layer are arranged at intervals, and the connecting line of the central points of the adjacent 3 transmitting coils is an equilateral triangle.
The utility model also provides a wireless charger which comprises a shell, wherein a charging coil structure is arranged in the shell.
Compared with the prior art, the charging coil structure of the wireless charger comprises the magnetism isolating sheet, wherein the magnetism isolating sheet is provided with the plurality of transmitting coils, the transmitting coils are overlapped in a crossed mode according to at least two layers, and each transmitting coil is at least intersected with two transmitting coils at the same time.
Drawings
Fig. 1 is a schematic structural diagram of a conventional charging coil.
Fig. 2 is a schematic diagram illustrating magnetic fields of adjacent wires offset each other when a wireless charger has multiple charging coils.
Fig. 3 is a schematic structural diagram of a charging coil structure of a wireless charger according to a first preferred embodiment of the utility model.
Fig. 4 is a schematic cross-sectional view taken along line a-a in fig. 3.
Fig. 5 is a schematic diagram illustrating an arrangement of a first layer of transmitting coils in a charging coil structure of a wireless charger according to a first preferred embodiment of the utility model.
Fig. 6 is a schematic diagram illustrating an arrangement of a third layer of transmitting coils in a charging coil structure of a wireless charger according to a first preferred embodiment of the utility model.
Fig. 7 is a schematic diagram illustrating an arrangement of a second layer of transmitting coils in a charging coil structure of a wireless charger according to a first preferred embodiment of the utility model.
Fig. 8 is a schematic structural diagram of a transmitting coil of a charging coil structure of a wireless charger according to the present invention.
Fig. 9 is a schematic structural diagram of a charging coil structure of a wireless charger according to a second preferred embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It will be understood that when an element is referred to as being "on," "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.
Referring to fig. 3 and 4, a charging coil structure of a wireless charger according to a first preferred embodiment of the present invention includes a magnetism-isolating sheet 1, where the magnetism-isolating sheet 1 is provided with a plurality of transmitting coils 2, the transmitting coils 2 are stacked in at least two layers in a crossed manner, and a first transmitting coil 2 is stacked in a crossed manner with at least two transmitting coils, so that each area facing the magnetism-isolating sheet is laid with a coil. According to the utility model, through the multilayer crossed and overlapped coil structure, the transmitting coil 2 can be effectively charged no matter the electronic terminal is placed at any position of the wireless charger during charging, so that the intelligent charging positioning is realized, and the magnetic force lines of the upper and lower coils are in the same direction in the manner of crossed arrangement of the multilayer coils, thereby being beneficial to improving the charging efficiency.
Preferably, the transmitting coils 2 are laid in three layers or more, each transmitting coil 2 is at least intersected with three coils at the same time, namely, at least four coils are intersected in each area in the direction (vertical to the visual angle of the magnetism isolating sheet 1) opposite to the magnetism isolating sheet 1, so that the coils are laid as densely as possible, and charging intelligent positioning is further facilitated.
The inductance value of transmitting coil 2 diminishes to the upper strata by lower floor in proper order, in other words, transmitting coil 2's the number of turns increases the round by lower floor to the upper strata in proper order to under the effect of magnetism isolating sheet 1, the inductance value that makes each layer coil during operation is the same, makes wireless charging power stable transmission, in order to do benefit to the control to charging power.
In an alternative embodiment, the transmitting coil 2 adjacent to the magnetic shield 1 (i.e., the lower layer) is the first layer, the middle transmitting coil 2 is the second layer, and the uppermost transmitting coil 2 is the third layer. The first layer of transmitting coil 2(21) has 8 turns of winding with inductance value of about 6.4 muH, the second layer of transmitting coil 2(22) has 9 turns of winding with inductance value of about 6.5 muH, the third layer of transmitting coil 2(23) has 10 turns of winding with inductance value of about 6.8 muH, which can balance the influence on the actual inductance value of the coil after the magnetism isolating sheet 1 is added, so that the inductance values of each layer of transmitting coil 2 and the magnetism isolating sheet 1 are the same, the coils can be matched with the same group of capacitors to form an LC circuit, if the inductance values of the coils on the QI magnetism isolating sheets 1 are different, capacitors with different capacitance values are needed to match the LC circuit, the product cost is increased, and materials (namely, the capacitors) are easy to mistake during production. In this case, RX detection (i.e., wireless reception detection) is easier even if the inductance values of the coils in each layer are equal.
The utility model balances the inductance difference of each layer of coil by making the turns of each layer of transmitting coil 2 different, greatly reduces the control difficulty of the wireless charging energy of the coil, is convenient for the power control of wireless charging, the detection of electric quantity value and plays a key role in the links of wireless current-limiting control and the like.
Referring to fig. 5, 6 and 7, in the coil structure of the charger of the present invention, the transmitting coils of each layer are spaced, the connecting line of the central points of the adjacent 3 transmitting coils is an equilateral triangle, and each layer of transmitting coils 2 almost covers all the area of the magnetic shield 1, so that the charging power of each area is substantially equal.
In this embodiment, the transmitting coil of middle level and lower floor is 7, and the transmitting coil on upper strata is 8, through the mode that 22 coils rules were piled up, makes transmitting coil evenly be covered with magnetism sheet 1 that separates to when charging, electronic terminal puts at the optional position, all has the coil to charge to it, realizes intelligent location, thereby makes the charging coil structure realize along with putting along with filling.
With reference to fig. 3 and fig. 4, according to the view angle of the perpendicular magnetic shielding sheet 1, the transmitting coils 2 are arranged in three rows, the transmitting coils 2 in each row are uniformly arranged, and the transmitting coils 2 in two adjacent rows are arranged in an intersecting manner, so that the transmitting coils 2 are uniformly distributed on the magnetic shielding sheet 1, and the receiving coil load (i.e. the electronic terminal to be charged) placed at any position of the whole charging coil structure can be matched with the corresponding coil to charge the charging coil.
In this embodiment, the transmitting coils 2 in the first row and the transmitting coils 2 in the third row are arranged symmetrically up and down, and the transmitting coils 2 in the second row intersect with the transmitting coils 2 around the second row (i.e. the transmitting coils 2 in the first and third rows), i.e. each transmitting coil 2 in the second row intersects with the adjacent transmitting coils above, below, left and right, so that the coils are laid uniformly.
The transmitting coil 2 of the first row can also be understood as the transmitting coil on the upper side of the charging coil structure, the transmitting coil 2 of the second row can also be understood as the transmitting coil in the middle of the charging coil structure, the transmitting coil 2 of the third row can also be understood as the transmitting coil on the lower side of the charging coil structure, each row of transmitting coils 2 comprises three layers of coils, namely an upper layer coil, a middle layer coil and a lower layer coil, the transmitting coils 2 of the wireless charger are uniformly and intensively distributed, each transmitting coil 2 is at least intersected with 3 transmitting coils at the same time, so that a terminal to be charged is placed at any position of the wireless charger, the same power is used for charging, intelligent accurate positioning charging is realized, namely, charging is carried out along with discharging, and the charging power at any position is the same.
As shown in fig. 3, the number of the transmitting coils 2 in the first row and the third row is 7, the number of the transmitting coils 2 in the second row is 8, and the transmitting coils 2 corresponding to the loads of the receiving coils placed at any position of the charging coil structure can be matched with the charging coil structure in a stacking manner of 22 coils, so that the charging intelligent positioning is realized, and the charging coil structure is realized in a charging manner along with the charging.
As shown in fig. 3-7, in the charging coil structure of the wireless charger of the present invention, adjacent transmitting coils are spaced apart from each other, for example, spaced apart by 3-5mm, in the transmitting coil 2 of each layer, so as to prevent magnetic fields of the adjacent transmitting coils 2 from offsetting each other during the charging process, and improve the charging efficiency. Preferably, when the wireless charger is charged and the transmitting coil induces the electronic equipment, the wireless charger can quickly position and control the corresponding transmitting coil to work and control the adjacent transmitting coil not to work, intelligent alignment positioning is realized, magnetic fields are prevented from being offset due to the fact that the adjacent coils work simultaneously, and fewer coils work, so that the wireless charger is less in heating, low in power, energy-saving and environment-friendly. Since the way of controlling the operating state of the coil is a function that can be realized by existing software, the present invention is not described in detail.
Referring to fig. 4, in the charging coil structure of the wireless charger of the present invention, the heat sink 3 is disposed under the magnetic shielding sheet 1, and the heat sink 3 may be a metal sheet with high heat dissipation performance, such as an iron sheet, an aluminum sheet, etc., and the heat of the transmitting coil 2 is rapidly dissipated during the charging process, so that the heat sink 3 can uniformly and rapidly dissipate heat when a plurality of electronic products are charged simultaneously, thereby preventing the temperature of the charger from being too high.
In this embodiment, magnetic separation piece 1 and fin 3 all are waist shape, transmitting coil 2 is circular, regular polygon, rectangle or oval, through the crossing mode that stacks of three-layer, makes elliptical magnetic separation piece 1 go up to be covered with transmitting coil 2, can accomplish to be located the transmitting coil 2 of outer lane and the interval at magnetic separation piece 1 edge within 5mm, does not have extravagant position on the magnetic separation piece 1, and wireless charger can set up to waist shape, appearance elegant appearance moreover.
In the specific embodiment, the round transmitting coil 2 is adopted, and 22 coils are uniformly arranged, so that the charging power of each area is more favorably the same, and the waist-shaped magnetism isolating sheet 1 can charge three or even more electronic terminals at the same time, thereby greatly reducing the purchase cost of users. Of course, in other embodiments, the number and the number of the transmitting coils 2 may also be changed, for example, a four-layer coil structure may be adopted, which is not limited in this respect, and only the requirements of the charging intelligent positioning and the charging power are satisfied for the convenience of control.
Further, the both ends of magnetism isolating sheet 1 are provided with semi-circular breach 11, its and screw adaptation to its casing assembly with wireless charger, semi-circular breach 11 can save magnetism isolating sheet 1's installation space, is favorable to wireless charger miniaturization, and the appearance that further promotes wireless charger is pleasing to the eye.
In an alternative embodiment, the outer diameter R of the transmitting coil 2Outer coverIs the inner diameter RInner part2-4 times, namely the aperture of the central hole of the transmitting coil 2 is 0.25-0.5 times of the diameter of the whole coil, namely the central hole of the transmitting coil 2 is larger than that of the prior art, thereby avoiding the magnetic field of two adjacent coils from being offset. For example, the inner diameter of the transmitting coil 2 of the present invention may be set to 25-30mm and the outer diameter to 40-45mm, which greatly enlarges the inner diameter of the transmitting coil 2 (from the comparison of fig. 8 and 2) compared to the conventional transmitting coil 2, and makes R constant with the outer diameterOuter cover-RInner partThe area of the magnetic field is greatly reduced, the dead zone of the magnetic field is reduced, and the effective induction area of a single coil is increasedAnd therefore, after the coils of each layer are combined together, the induction blind area is greatly reduced, the blind area of the whole charging coil structure can be greatly reduced, the charging panel of the wireless charger is more favorable, and any position is charged along with the coil.
Preferably, the outer diameter of each emitting warp ring is the same, and the inner diameter of each emitting warp ring is reduced from top to bottom in sequence, the inner diameter of the lower emitting warp ring is smaller than that of the upper emitting coil by 0.5-3mm, so that the magnetic field intensity is reduced from top to bottom in sequence, and the equal emitting power is facilitated after the magnetic shielding sheets are balanced by the coils of each layer.
Because the number of turns of each layer of transmitting coils is different, the coils are uniformly stacked, the outer diameters of the transmitting coils are the same, the inner diameters of the transmitting coils 2 of each layer are sequentially increased from the lower layer to the upper layer, so that uniform stacking is ensured, and the inductance values of the coils of each layer are the same after the magnetic shielding sheets 1 are balanced. Such as: the utility model can set the outer diameter of the transmitting coil 2 to be 41mm, the inner diameter of the lower layer transmitting coil to be 24mm, the inner diameter of the middle layer transmitting coil to be 24.3mm and the inner diameter of the upper layer transmitting coil to be 24.6mm, so that the inductance value of the coil is smaller than that of the existing transmitting coil, and the inner diameter of the coil is larger than that of the existing transmitting coil, thereby increasing the magnetic flux and greatly improving the charging efficiency.
Furthermore, the wire for winding the transmitting coil 2 is a multi-strand enameled wire, the number of the strands of the wire is 40-95 strands, and the cross section of the wire is flat, so that the output power of charging is increased, and the charging efficiency is improved.
Furthermore, the lead of the transmitting coil 2 is led out from the long side edge of the magnetism isolating sheet 1, and regular outgoing positions are adopted, so that the charging current directions of all coils in the same group of drives are consistent, the voltage of the transmitting coil which does not work can be inhibited, and the wireless charger can be better protected.
Please refer to fig. 9, which is a schematic structural diagram of a charging coil structure of a wireless charger according to a second preferred embodiment of the present invention. The second preferred embodiment is different from the first preferred embodiment only in that the number of each layer on the same magnetic shield is different, for example, the charging coil structure is formed by arranging 19 coils, wherein the number of the transmitting coils at the upper layer and the middle layer is 6, the number of the transmitting coils at the lower layer is 7, two adjacent coils at each layer are arranged in a tangent manner, and the size, the wire diameter and the like of the coils can be slightly adjusted according to requirements. This embodiment has used less coil, realizes the function of coil equipartition, automatic positioning equally, has still saved material cost moreover. During charging, only the corresponding transmitting coil needs to be positioned and controlled to work, and the transmitting coil adjacent to the corresponding transmitting coil does not work.
Based on the charging coil structure, the utility model further provides a wireless charger which comprises a shell, wherein the charging coil structure is arranged in the shell. Since the charging coil structure has been described in detail above, it will not be described in detail here.
In conclusion, the three-layer coil structure which is crossed and overlapped can effectively charge the electronic terminal no matter the electronic terminal is placed on the wireless charger part during charging, so that the intelligent charging positioning is realized, and the three-layer coil structure which is crossed is favorable for improving the charging efficiency.
Meanwhile, the number of turns of each layer of transmitting coils is different, so that the inductance difference of each layer of coils is balanced, the control difficulty of the wireless charging energy of the coils is greatly reduced, the power control and the electric quantity value detection of wireless charging are facilitated, and the wireless current limiting control and other links play a key role.
In addition, under the condition that the outer diameter of the coil is not changed, the inner diameter of the coil is enlarged, and the effective induction area of a single coil is increased, so that after the coils of each layer are combined together, the induction blind area is greatly reduced, the blind area of the whole charging coil structure is also greatly reduced, and the charging panel of the wireless charger is more beneficial to charging at any position.
It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (9)
1. A charging coil structure of a wireless charger comprises a magnetic shield, wherein a plurality of transmitting coils are arranged on the magnetic shield, and the charging coil structure is characterized in that the transmitting coils are overlapped in a crossed manner according to at least two layers, and each transmitting coil is at least intersected with two transmitting coils at the same time; the inductance value of transmitting coil diminishes to the upper strata by the lower floor in proper order, and each transmission is the same through the external diameter of circle, the internal diameter from the top down reduces in proper order, makes magnetic field intensity diminish from last to down in proper order.
2. The charging coil structure of wireless charger according to claim 1, wherein the transmitting coils are laid in three or more layers, each transmitting coil intersecting at least three coils at the same time.
3. The charging coil structure of the wireless charger according to claim 2, wherein the outer diameter of the transmitting coil is 2-4 times the inner diameter.
4. The charging coil structure of wireless charger according to claim 3, wherein the transmitting coils are arranged in three rows, each row of transmitting coils being arranged uniformly.
5. The charging coil structure of wireless charger according to claim 4, wherein the transmitting coils of the first row are arranged symmetrically with the third row, and the transmitting coils of the second row intersect with the transmitting coils at the periphery thereof.
6. The charging coil structure of wireless charger according to claim 5, wherein the number of the transmitting coils of the middle layer and the lower layer is 7, and the number of the transmitting coils of the upper layer is 8.
7. The charging coil structure of wireless charger according to claim 5, wherein the number of the transmitting coils at the upper layer and the middle layer is 6, and the number of the transmitting coils at the lower layer is 7.
8. The charging coil structure of wireless charger according to claim 6, wherein the transmitting coils of each layer are arranged at intervals, and the connecting line of the central points of the adjacent 3 transmitting coils is an equilateral triangle.
9. A wireless charger comprising a housing, wherein a charging coil structure according to any one of claims 1-8 is disposed in the housing.
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| CN202120609188.5U CN215956124U (en) | 2021-03-25 | 2021-03-25 | Wireless charger and charging coil structure thereof |
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| CN202120609188.5U CN215956124U (en) | 2021-03-25 | 2021-03-25 | Wireless charger and charging coil structure thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886722A (en) * | 2021-03-25 | 2021-06-01 | 深圳劲芯微电子有限公司 | Wireless charger and charging coil structure thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886722A (en) * | 2021-03-25 | 2021-06-01 | 深圳劲芯微电子有限公司 | Wireless charger and charging coil structure thereof |
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