NFC charging antenna and charging device

Abstract

The utility model discloses an NFC charging antenna and a charging device, the NFC charging antenna comprises a substrate, a first coil and a second coil, and the substrate is provided with a first side surface and a second side surface which are oppositely arranged; the first coil is arranged on the first side face, the second coil is arranged on the second side face, one end of the first coil is connected with one end of the second coil, and the other end of the first coil and the other end of the second coil are both connected with an antenna matching circuit. A part of the first coil and the second coil coincide to generate an overlapping area, and the current flow directions of the first coil and the second coil are consistent, so that magnetic flux generated by the current passing through the first coil is coupled with magnetic flux generated by the current passing through the second coil. According to the technical scheme of the utility model, the area of the wireless charging coil can be reduced, the communication quality and the charging efficiency of the antenna are improved, and the wireless charging performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of antenna equipment, and in particular to an NFC charging antenna and a charging device. Background Art

[0002] With the popularity of smart devices, the requirements for wireless charging technology have also increased. Under existing technologies, the recognition distance of conventional charging NFC antennas is relatively short, and the range is also small. In addition, the resonant frequency of the antenna is 13.56MHz, which is very low. The wireless charging coils on the market require a relatively large area. If some small electronic products want to add wireless charging functions, they need to reserve a relatively large area for antenna debugging, which greatly affects the stacking of components. However, if the antenna debugging area is very small, the performance of the antenna will be compromised, resulting in low charging efficiency, and even causing serious heating of the circuit, shortening the service life. Utility Model Content

[0003] The main purpose of the utility model is to provide an NFC charging antenna, which aims to reduce the area of ​​the wireless charging coil, improve the communication quality and charging efficiency of the antenna, and improve the performance of wireless charging.

[0004] To achieve the above object, the utility model proposes an NFC charging antenna, comprising:

[0005] A substrate having a first side surface and a second side surface arranged opposite to each other;

[0006] a first coil, the first coil being arranged on the first side,

[0007] a second coil, the second coil being disposed on the second side,

[0008] Among them, one end of the first coil is connected to one end of the second coil, the other end of the first coil and the other end of the second coil are both connected to the antenna matching circuit, part of the first coil and the second coil overlap to produce an overlapping area, and the current flow directions of the first coil and the second coil are consistent, so that the magnetic flux generated by the current passing through the first coil is coupled with the magnetic flux generated by the current passing through the second coil.

[0009] It may be further configured that the substrate further has a through hole penetrating the first side surface and the second side surface thereof, and one end of the first coil is connected to one end of the second coil at the through hole.

[0010] It may be further configured that a conductive portion is provided in the through hole, and two ends of the conductive portion are respectively connected to one end of the first coil and one end of the second coil.

[0011] It can be further configured that the first coil includes a first end, a second end, and a first section connecting the first end and the second end, the first section is wound multiple turns on the first side, the first end is located outside the first section wound multiple turns, the first end is used to connect the antenna matching circuit, and the second end is located inside the first section wound multiple turns;

[0012] The second coil includes a third end, a fourth end, and a second section connecting the third end and the fourth end, the second section is wound multiple turns on the second side surface and is arranged opposite to the first section, the third end is located outside the multiple turns of the second section, the third end is used to connect the antenna matching circuit, and the fourth end is located inside the multiple turns of the second section;

[0013] The second end and the fourth end are connected to form a connection point, and the current flow direction of the second end is consistent with the current flow direction of the fourth end after passing through the connection point.

[0014] It can be further configured that the first section is wound multiple times in a clockwise or counterclockwise direction from the first end to the second end, and the second section is wound multiple times in a direction opposite to the first section from the third end to the fourth end, so that the current generated by the first section and the second section flows in the same direction.

[0015] It can be further configured that there is a first gap between adjacent coils of the first section wound with multiple turns, and the width of the first gap between different coils is the same; there is a second gap between adjacent coils of the second section wound with multiple turns, and the width of the second gap between different coils is the same.

[0016] It can be further arranged that the winding trajectory of the first section overlaps with the winding trajectory of the second section to form the overlapping area.

[0017] It can be further set that the offset distance between the first section and the second section is less than or equal to the sum of the width of the first gap and the width of the first section; the offset distance between the second section and the first section is less than or equal to the sum of the width of the second gap and the width of the second section.

[0018] It may be further configured that the substrate includes an insulating plate, and / or the first coil and the second coil both include copper coils.

[0019] The utility model also provides a charging device, which includes the NFC charging antenna described in any one of the above items.

[0020] The technical solution of the utility model adopts a first coil arranged on the first side surface and a second coil arranged on the second side surface, and makes the current flow directions of the first coil and the second coil consistent, so that the magnetic flux generated on both sides of the substrate can be coupled and increased, thereby increasing the inductance and improving the charging efficiency per unit area of ​​the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 This is a front view of the overall structure of an embodiment of an NFC charging antenna of the utility model;

[0023] Figure 2 for Figure 1 Rear view of the overall structure of the NFC charging antenna;

[0024] Figure 3 for Figure 1 A schematic diagram of the structure of the first coil and the second coil in the NFC charging antenna;

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of the substrate in the NFC charging antenna.

[0026] Description of Figure Numbers:

[0027] 1. substrate; 11. first side surface; 12. second side surface; 13. through hole; 14. conductive part;

[0028] 2. first coil; 21. first end; 22. first section; 23. second end; 24. first gap;

[0029] 3. Second coil; 31. Third end; 32. Second section; 33. Fourth end; 34. Second gap.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] The utility model proposes an NFC charging antenna proposed by the utility model, comprising a substrate 1, a first coil 2 and a second coil 3, the substrate 1 has a first side surface 11 and a second side surface 12 arranged opposite to each other, the first coil 2 is arranged on the first side surface 11, the second coil 3 is arranged on the second side surface 12, one end of the first coil 2 is connected to one end of the second coil 3, the other end of the first coil 2 and the other end of the second coil 3 are both connected to the antenna matching circuit, part of the first coil 2 and the second coil 3 overlap to generate an overlapping area, and the current flow directions of the first coil 2 and the second coil 3 are consistent, so that the magnetic flux generated by the current passing through the first coil 2 is coupled with the magnetic flux generated by the current passing through the second coil 3.

[0035] The technical solution of the utility model adopts a first coil 2 arranged on the first side 11 and a second coil 3 arranged on the second side 12, and makes the current flow directions of the first coil 2 and the second coil 3 consistent, so that the magnetic flux generated on both sides of the substrate 1 can be coupled and increased, thereby increasing the inductance, improving the charging efficiency per unit area of ​​the substrate 1, and improving the effective distance and stability of charging.

[0036] In other embodiments, it can be further configured that the substrate 1 further has a through hole 13 penetrating the first side surface 11 and the second side surface 12 thereof, and one end of the first coil 2 is connected to one end of the second coil 3 at the through hole 13 .

[0037] In this way, connecting the first coil 2 and the second coil 3 at the through hole 13 can make the entire circuit structure more compact, which can effectively save space and make the size of the entire circuit board smaller.

[0038] In other embodiments, it may be further configured that a conductive portion 14 is provided in the through hole 13 , and two ends of the conductive portion 14 are respectively connected to one end of the first coil 2 and one end of the second coil 3 .

[0039] In this way, connecting the first coil 2 and the second coil 3 through the conductive part 14 can increase the stability of the connection. Since the conductive part 14 is designed for the through hole 13, the contact quality between the coil and the conductive part 14 can be better ensured, thereby avoiding problems such as poor contact or looseness. In addition, connecting the coils through the conductive part 14 can make the entire circuit structure more compact. The conductive part 14 can be embedded in the through hole 13 without taking up too much space, thereby making the size of the entire circuit board smaller.

[0040] In other embodiments, the first coil 2, the conductive portion 14 and the second coil 3 can be integrally formed, so that if the coil needs to be repaired or replaced, it can be relatively easy to do so. No welding or other complicated connection methods are required, and the repair or replacement can be completed by simply disassembling the coil and re-inserting it through the through hole 13.

[0041] In other embodiments, it can be further configured that the first coil 2 includes a first end 21 and a second end 23 and a first section 22 connecting the first end 21 and the second end 23, the first section 22 is wound multiple turns on the first side surface 11, the first end 21 is located outside the multiple turns of the first section 22, the first end 21 is used to connect the antenna matching circuit, and the second end 23 is located inside the multiple turns of the first section 22;

[0042] The second coil 3 includes a third end 31, a fourth end 33, and a second section 32 connecting the third end 31 and the fourth end 33. The second section 32 is wound multiple turns on the second side surface 12 and is arranged opposite to the first section 22. The third end 31 is located outside the multiple turns of the second section 32. The third end 31 is used to connect the antenna matching circuit. The fourth end 33 is located inside the multiple turns of the second section 32.

[0043] The second end 23 and the fourth end 33 are connected to form a connection point, and the current flow direction of the second end 23 is consistent with the current flow direction of the fourth end 33 after passing through the connection point.

[0044] In this way, by connecting the second end 23 of the first coil 2 with the fourth end 33 of the second coil 3, it is possible to ensure that the current phases in the two coils remain consistent. This means that after the current passes through the connection point, the current flowing to the first coil 2 will be consistent with the current flowing to the second coil 3, which can ensure that the electromagnetic coupling effect between the coils reaches the optimal state, thereby increasing the inductance value, improving the efficiency of energy transmission, and reducing energy loss.

[0045] In other embodiments, it can be further configured that the first section 22 is wound multiple times in a clockwise or counterclockwise direction from the first end 21 to the second end 23, and the second section 32 is wound multiple times in a direction opposite to the first section 22 from the third end 31 to the fourth end 33, so that the current generated by the first section 22 and the second section 32 flow in the same direction.

[0046] Thus, by winding the coils in this way, an electromagnetic coupling effect can be achieved. When current passes through the first section 22 of the coil, due to its winding direction, a current in the same direction will be generated in the second section 32 of the coil. In this way, the electromagnetic coupling effect between the two coils will be enhanced, thereby achieving better energy transmission.

[0047] In other embodiments, it can be further configured that a first gap 24 is provided between adjacent coils of the first section 22 wound in multiple turns, and the width of the first gap 24 between different coils is the same; a second gap 34 is provided between adjacent coils of the second section 32 wound in multiple turns, and the width of the second gap 34 between different coils is the same.

[0048] In this way, the first gap 24 and the second gap 34 can provide an electrical insulation effect to prevent current short circuits between adjacent coil layers. By ensuring that the gap widths between different coil layers are the same, consistent electrical insulation performance can be maintained, which helps to improve the safety and reliability of the coil. By keeping the gap widths between adjacent coil layers the same, a consistent physical distance can be maintained between each coil layer, reducing the change in magnetic flux. This helps to achieve a more stable electromagnetic coupling effect and improve the performance and precision of the coil. By setting the same gap width, the manufacturing process of the coil can be simplified.

[0049] In other embodiments, it may be further configured that the winding trajectory of the first section 22 overlaps with the winding trajectory of the second section 32 to form an overlapping area.

[0050] In this way, by making the winding tracks of the first section 22 and the second section 32 overlap, the physical distance between the coils can be made closer, thereby enhancing the electromagnetic coupling effect, achieving higher energy transmission efficiency, and effectively reducing the overall size of the NFC charging antenna.

[0051] In other embodiments, it can be further configured that the offset distance between the first section 22 and the second section 32 is less than or equal to the sum of the width of the first gap 24 and the width of the first section 22; the offset distance between the second section 32 and the first section 22 is less than or equal to the sum of the width of the second gap 34 and the width of the second section 32.

[0052] In this way, the offset distance in this embodiment refers to the distance between the outermost circle of the first section 22 and the outermost circle of the second section 32, which can be offset at any angle of 360°. By controlling the offset distance between the coil layers, the physical distance difference between the coils can be reduced, thereby increasing the electromagnetic coupling effect between the first section 22 and the second section 32. This helps to achieve a more stable electromagnetic coupling effect and improve the performance of wireless charging.

[0053] In other embodiments, it may be further configured that the substrate 1 includes an insulating plate, and / or that the first coil 2 and the second coil 3 both include copper coils.

[0054] In this way, the insulating plate has good electrical insulation performance, can effectively isolate and prevent the flow of current, and avoid interference with the electromagnetic coupling between the first coil 2 and the second coil 3.

[0055] The utility model also proposes a charging device, which includes an NFC charging antenna. The specific structure of the NFC charging antenna refers to the above embodiment. Since the charging device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0056] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An NFC charging antenna, characterized in that: include: A substrate having a first side surface and a second side surface arranged opposite to each other; a first coil, the first coil being arranged on the first side, a second coil, the second coil being disposed on the second side, Among them, one end of the first coil is connected to one end of the second coil, the other end of the first coil and the other end of the second coil are both connected to the antenna matching circuit, part of the first coil and the second coil overlap to produce an overlapping area, and the current flow directions of the first coil and the second coil are consistent, so that the magnetic flux generated by the current passing through the first coil is coupled with the magnetic flux generated by the current passing through the second coil.

2. The NFC charging antenna according to claim 1, characterized in that: The substrate further has a through hole penetrating the first side surface and the second side surface thereof, and one end of the first coil is connected to one end of the second coil at the through hole.

3. The NFC charging antenna according to claim 2, characterized in that: A conductive portion is disposed in the through hole, and two ends of the conductive portion are respectively connected to one end of the first coil and one end of the second coil.

4. The NFC charging antenna according to claim 1, characterized in that: The first coil comprises a first end, a second end and a first section connecting the first end and the second end, the first section is wound on the first side surface with multiple turns, the first end is located outside the first section wound with multiple turns, the first end is used to connect the antenna matching circuit, and the second end is located inside the first section wound with multiple turns; The second coil includes a third end, a fourth end, and a second section connecting the third end and the fourth end, the second section is wound multiple turns on the second side surface and is arranged opposite to the first section, the third end is located outside the multiple turns of the second section, the third end is used to connect the antenna matching circuit, and the fourth end is located inside the multiple turns of the second section; The second end and the fourth end are connected to form a connection point, and the current flow direction of the second end is consistent with the current flow direction of the fourth end after passing through the connection point.

5. The NFC charging antenna according to claim 4, characterized in that: The first section is wound multiple times in a clockwise or counterclockwise direction from the first end to the second end, and the second section is wound multiple times in a direction opposite to the first section from the third end to the fourth end, so that the currents generated by the first section and the second section flow in the same direction.

6. The NFC charging antenna according to claim 4, characterized in that: There is a first gap between adjacent coils of the first section wound with multiple turns, and the width of the first gap between different coils is the same; there is a second gap between adjacent coils of the second section wound with multiple turns, and the width of the second gap between different coils is the same.

7. The NFC charging antenna according to claim 4, characterized in that: The winding trajectory of the first section overlaps with the winding trajectory of the second section to form the overlapping area.

8. The NFC charging antenna according to claim 6, characterized in that: The offset distance between the first section and the second section is less than or equal to the sum of the width of the first gap and the width of the first section; the offset distance between the second section and the first section is less than or equal to the sum of the width of the second gap and the width of the second section.

9. The NFC charging antenna according to claim 1, characterized in that: The substrate includes an insulating plate, and / or the first coil and the second coil both include copper coils.

10. A charging device, characterized in that: The charging device comprises the NFC charging antenna according to any one of claims 1 to 9.

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