Vehicle-mounted wireless charging antenna array

Abstract

The utility model provides a vehicle-mounted wireless charging antenna array. The vehicle-mounted wireless charging antenna array comprises a first main coil, a second main coil and an auxiliary coil, the first main coil and the second main coil serve as a bottom layer and are arranged at an interval, the auxiliary coil serves as a top layer and is stacked on the top of the first main coil and the top of the second main coil, and the opposite sides of the first main coil and the second main coil have overlapping areas with the auxiliary coil; the first main coil, the second main coil and the auxiliary coil are runway type coils. The utility model has the advantages that the waveform formed by stacking the first main coil, the second main coil and the auxiliary coil is more concentrated, and the magnetic field distribution is stronger, so that a plurality of terminal devices can be well supported to be charged at the same time, the switching between fast charging and slow charging can be realized, and the charging efficiency is improved. And the actual vehicle-mounted use requirement can be well met.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle-mounted wireless charging technical field, especially a kind of vehicle-mounted wireless charging antenna array. BACKGROUND

[0002] Wireless charging technology has gradually penetrated into smart phones, wearable devices, automotive electronics, household appliances and other fields. In the future, efficient, long-distance wireless charging technology will be widely used, and further improve user experience. For example, Qi 2.1 vehicle-mounted wireless charging technology launched by WPC solves the charging problem caused by mobile phone movement, improves charging effect and stability.

[0003] There are two main routes for wireless charging technology, one is inductive coupling route, and the other is magnetic resonance route, both routes have their own advantages. At present, the mainstream communication technology of vehicle-mounted is still dominated by inductive coupling technology, the biggest advantage of inductive coupling technology is to support variable power charging, so that the switching efficiency of fast charging and ordinary charging is relatively high. However, the existing vehicle-mounted wireless charging device usually only sets a single coil, which can only support single terminal device charging, and multiple terminal devices need to wait in turn for charging, the main reason is that multiple coils are simply arranged and have strong electromagnetic interference between each other, which greatly reduces the charging efficiency, and even causes charging failure. Therefore, it is urgent to provide a vehicle-mounted wireless charging antenna array capable of supporting multiple terminal devices charging at the same time. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a vehicle-mounted wireless charging antenna array, which can support multiple terminal devices charging at the same time.

[0005] The utility model is realized as follows: a vehicle-mounted wireless charging antenna array, comprising a first main coil, a second main coil and an auxiliary coil; the first main coil and the second main coil are arranged as a bottom layer with a spacing, the auxiliary coil is stacked on the top of the first main coil and the second main coil as a top layer, and the side of the first main coil and the second main coil facing each other both have an overlapping area with the auxiliary coil; the first main coil, the second main coil and the auxiliary coil are all runway type coils.

[0006] Further, the specifications of the first main coil, the second main coil and the auxiliary coil are the same.

[0007] Further, the number of turns of the first main coil, the second main coil and the auxiliary coil is 12 turns.

[0008] Further, the spacing between the first main coil and the second main coil is 10±0.5mm.

[0009] Further, the center points of the first main coil, the second main coil and the auxiliary coil are located on the same straight line.

[0010] Further, the distance between the center point of the auxiliary coil and the center point of the first main coil is 25±0.5mm, and the distance between the center point of the auxiliary coil and the center point of the second main coil is 25±0.5mm.

[0011] Further, the length direction of the auxiliary coil is parallel to the width direction of the first main coil and the second main coil.

[0012] Further, the overall length of the first main coil, the second main coil and the auxiliary coil is 50±1mm, and the overall width of the first main coil, the second main coil and the auxiliary coil is 40±1mm.

[0013] Further, the first main coil, the second main coil and the auxiliary coil all extend outward to form two wiring terminals.

[0014] By adopting the technical scheme of the utility model, at least the following beneficial effects are obtained: three coils are designed to form the vehicle-mounted wireless charging antenna array, the positions of the three coils present a two-layer structure design, the shapes of the three coils are all designed to be runway type structures, and the number of turns of the three coils is all 12; by adopting the above structure design, the magnetic field distribution can be effectively improved, the electromagnetic interference generated between the first main coil, the second main coil and the auxiliary coil is greatly reduced, the waveform convergence formed after the first main coil, the second main coil and the auxiliary coil are stacked is more concentrated, and the magnetic field distribution is stronger, so that not only can the simultaneous charging of multiple terminal devices be well supported, but also fast charging and slow charging switching can be realized, and the actual use requirements of the vehicle-mounted wireless charging antenna array can be well met. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be further described in connection with the embodiments and with reference to the drawings.

[0016] Figure 1 is the structure diagram of the utility model vehicle-mounted wireless charging antenna array;

[0017] Figure 2 is the general antenna pattern diagram;

[0018] Figure 3 is the antenna array pattern diagram formed after the three runway type coils (i.e. the first main coil, the second main coil and the auxiliary coil) with 12 turns are stacked;

[0019] Figure 4 is the antenna pattern diagram using a single runway type coil as the antenna;

[0020] Figure 5 is a directional diagram of an antenna array formed by the first main coil and the second main coil both adopting a racetrack coil and the auxiliary coil adopting a circular ring coil;

[0021] Figure 6 is a directional diagram of an antenna array formed by the auxiliary coil being translated by a certain position;

[0022] Figure 7 is a directional diagram of an antenna array formed by three racetrack coils with 10 turns being stacked.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] A vehicle-mounted wireless charging antenna array 100;

[0025] A first main coil 1;

[0026] A second main coil 2;

[0027] An auxiliary coil 3;

[0028] A terminal 4;

[0029] A main lobe 51, a side lobe 52 and a back lobe 53. DETAILED DESCRIPTION

[0030] In order to better understand the technical scheme of the utility model, the technical scheme of the utility model will be described in detail below in combination with the drawings of the specification and specific implementation manners.

[0031] It should be noted here that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing these embodiments and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features.

[0032] Before this, introduce the existing single coil's vehicle wireless charging device first, its coil uses the enamel copper wire with 0.4mm diameter, and the enamel copper wire is wrapped 10 turns in total, and the whole coil is circular ring structure. Because in the actual design process, if just simply parallel design to multiple coils, will lead to produce great electromagnetic interference, thereby can greatly reduce the wireless charging efficiency, even cause unable to realize wireless charging, this is also the core reason that the existing vehicle wireless charging device can only support single terminal equipment charging. And the utility model discloses a wireless charging antenna array through careful design, thereby realizes the effect that multiple terminal equipment simultaneously carries out wireless charging, the technical scheme of specific implementation is as follows detailed introduction.

[0033] Please refer to Figure 1 The utility model discloses a vehicle wireless charging antenna array 100, the vehicle wireless charging antenna array 100 includes first main coil 1, second main coil 2 and auxiliary coil 3, wherein, first main coil 1 and second main coil 2 are used to realize low voltage charging (i.e. slow charging), the auxiliary coil 3 is used to cooperate with first main coil 1 and / or second main coil 2 and realizes high voltage charging (i.e. fast charging), first main coil 1 and second main coil 2 are as bottom layer and spacing arrangement, the auxiliary coil 3 is as top layer and is stacked on the top of first main coil 1 and second main coil 2, and the side of first main coil 1 and second main coil 2 is opposite and all with auxiliary coil 3 Overlapping area, i.e. the vehicle wireless charging antenna array 100 of the utility model adopts two-layer structure design, and first main coil 1 and second main coil 2 for providing low voltage are as bottom layer, and auxiliary coil 3 is as top layer and is directly stacked on first main coil 1 and second main coil 2, first main coil 1, second main coil 2 and auxiliary coil 3 are all runway type coils.

[0034] In the utility model, the specification of first main coil 1, second main coil 2 and auxiliary coil 3 is same.

[0035] In the utility model, the number of turns of first main coil 1, second main coil 2 and auxiliary coil 3 are all 12 turns. Meanwhile, the first main coil 1, second main coil 2 and auxiliary coil 3 can all be wrapped by enamel copper wire in the specific implementation of the utility model.

[0036] In the process of specific implementation, the length (i.e. the number of turns) of the antenna, the shape, and the stacking position will have a significant impact on the magnetic field distribution. The utility model discloses a 3 coil is designed to form the vehicle wireless charging antenna array 100, and the position of three coils presents two layer structure design, and the shape of 3 coils is runway type structure, and the number of turns of three coils is 12 turns, which can effectively improve the magnetic field distribution, greatly reduce the electromagnetic interference between the first main coil 1, the second main coil 2 and the auxiliary coil 3, make the waveform convergence of the first main coil 1, the second main coil 2 and the auxiliary coil 3 after stacking more concentrated, and the magnetic field distribution is stronger, so that not only can the simultaneous charging of multiple terminal devices be well realized, but also the fast charging and slow charging switching can be realized, and the actual use demand of vehicle can be well met.

[0037] In the preferred embodiment of the utility model, the distance between the first main coil 1 and the second main coil 2 is 10±0.5mm.

[0038] In the preferred embodiment of the utility model, the center points of the first main coil 1, the second main coil 2 and the auxiliary coil 3 are located on the same straight line.

[0039] In the preferred embodiment of the utility model, the distance between the center point of the auxiliary coil 3 and the center point of the first main coil 1 is 25±0.5mm, and the distance between the center point of the auxiliary coil 3 and the center point of the second main coil 2 is 25±0.5mm.

[0040] The applicant finds through a large number of experiments that the distance between the first main coil 1 and the second main coil 2 and the stacking position of the auxiliary coil 3 will also have a certain impact on the magnetic field distribution. The utility model designs the distance between the first main coil 1 and the second main coil 2 to be 10±0.5mm, and makes the center points of the first main coil 1, the second main coil 2 and the auxiliary coil 3 on the same straight line, and designs the distance between the center point of the auxiliary coil 3 and the center points of the first main coil 1 and the second main coil 2 to be 25±0.5mm, which can further improve the magnetic field distribution, ensure that the waveform convergence of the entire vehicle wireless charging antenna array 100 is more concentrated, and the magnetic field distribution is stronger.

[0041] As a preferred embodiment of the utility model, the length direction of the auxiliary coil 3 is parallel to the width direction of the first main coil 1 and the second main coil 2.

[0042] As a preferred embodiment of the utility model, the overall length of the first main coil 1, the second main coil 2 and the auxiliary coil 3 is 50 ± 1mm, and the overall width of the first main coil 1, the second main coil 2 and the auxiliary coil 3 is 40 ± 1mm; at the same time, the width of the innermost circle of the first main coil 1, the second main coil 2 and the auxiliary coil 3 can be designed as 20 ± 0.5mm. Of course, the above specific size design is only a preferred embodiment of the utility model, but the utility model is not limited to this, and the specific size can be adjusted according to actual needs in specific implementation.

[0043] In the utility model, the first main coil 1, the second main coil 2 and the auxiliary coil 3 all extend outward to form two wiring terminals 4. Because the vehicle-mounted wireless charging antenna array 100 needs to control the first main coil 1, the second main coil 2 and the auxiliary coil 3 by using the control mainboard during specific work, the first main coil 1, the second main coil 2 and the auxiliary coil 3 are designed to extend outward to form two wiring terminals 4, so that the electrical connection with the control mainboard can be facilitated.

[0044] The vehicle-mounted wireless charging antenna array 100 of the utility model can control any one of the first main coil 1 and the second main coil 2 to work according to actual needs during specific use, can control the first main coil 1 and the auxiliary coil 3 to work simultaneously or control the second main coil 2 and the auxiliary coil 3 to work simultaneously, and can also control the first main coil 1, the second main coil 2 and the auxiliary coil 3 to work simultaneously, so that the use requirements of fast charging and slow charging can be well met.

[0045] The wireless charging antenna array 100 of the utility model will be further described in detail in combination with the antenna pattern as follows:

[0046] The antenna surface current radiates through the medium and produces an electromagnetic field in the far field area, and the spherical coordinate system can be used to represent the far field electromagnetic field. The pattern is used to describe the quantitative relationship of the antenna parameters with the change of the azimuth angle. According to the pattern, the far field amplitude or gain of the antenna can be intuitively reflected; the pattern can be a 3D pattern or a 2D polar coordinate form pattern, and the present application adopts a 2D pattern to represent the magnetic field direction.

[0047] Other concepts about the pattern are as follows: Figure 2As shown, the general antenna pattern has more than two lobes, wherein the level lobe with the strongest field strength direction is the main lobe 51, the remaining lobes are side lobes 52, and the lobe opposite to the main lobe direction is called the back lobe 53. The maximum radiation direction of the main lobe 51 is the point at which the radiation intensity on both sides decreases by 3dB, and the included angle α on both sides is called the main lobe width; the smaller the main lobe width, the better the directivity of the antenna, the more concentrated the energy, and the stronger the directivity, and the side lobe represents the energy spreading in the direction that we do not need, which is not expected, so the generation of the side lobe 52 should be reduced.

[0048] As shown in Figure 3 and Figure 4 : Figure 3 is the antenna array directional diagram formed by stacking the three racetrack coils with 12 turns (i.e. the first main coil 1, the second main coil 2 and the auxiliary coil 3) of the utility model; Figure 4 is the directional diagram of an antenna using a single racetrack coil. By Figure 3 and Figure 4 Comparison can be directly observed that the waveform of the three racetrack coils stacked is more concentrated, and the magnetic field distribution is stronger, which is the basis for realizing fast and slow rushes.

[0049] As shown in Figure 3 and Figure 5 : Figure 3 is the antenna array directional diagram formed by stacking the three racetrack coils with 12 turns (i.e. the first main coil 1, the second main coil 2 and the auxiliary coil 3) of the utility model; Figure 5 is the directional diagram of an antenna array formed by using racetrack coils for the first main coil and the second main coil, and using a circular ring coil for the auxiliary coil. By Figure 3 and Figure 5 Comparison can be directly observed that when the shape of the auxiliary coil changes, the direction of the antenna main lobe will produce angular deviation, thereby causing the magnetic field strength in the charging direction to be obviously attenuated.

[0050] As shown in Figure 3 and Figure 6 : Figure 3 is the antenna array directional diagram formed by stacking the three racetrack coils with 12 turns (i.e. the first main coil 1, the second main coil 2 and the auxiliary coil 3) of the utility model; Figure 6 is the directional diagram of an antenna array formed by translating the auxiliary coil by a certain position, specifically, the auxiliary coil is translated to outside the range defined by the utility model, and a directional diagram with a better distribution is selected. When the auxiliary coil is placed by being translated by a certain position in specific implementation, the magnetic field distribution will also change greatly, such as by Figure 3 and Figure 6It can be seen from the comparison that after the translation of the auxiliary coil, the field intensity is attenuated from 20dB to about 10dB, and the sidelobe is also increased.

[0051] As shown in Figure 3 and Figure 7 : Figure 3 is the radiation pattern of the antenna array formed by stacking the three racetrack coils with 12 turns (i.e., the first main coil 1, the second main coil 2 and the auxiliary coil 3); Figure 7 is the radiation pattern of the antenna array formed by stacking the three racetrack coils with 10 turns. Figure 3 and Figure 7 It can be seen from the comparison that when the number of turns of the racetrack coil changes from 12 turns to 10 turns, the field intensity is attenuated from 20dB to about 10dB, and the sidelobe is also increased.

[0052] It can be seen from the comparison that the length (i.e., the number of turns) of the antenna, the shape and the stacking position all have a great influence on the magnetic field distribution. The wireless charging antenna array 100 is formed by stacking the first main coil 1, the second main coil 2 and the auxiliary coil 3 in a two-layer structure, and the shape, length and stacking position of the first main coil 1, the second main coil 2 and the auxiliary coil 3 are designed ingeniously, so that the waveform formed by stacking the first main coil 1, the second main coil 2 and the auxiliary coil 3 is more concentrated, and the magnetic field distribution is stronger, thereby supporting multiple terminal devices to be charged at the same time, and meeting the use requirements of fast charging and slow charging.

[0053] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described are only illustrative, and are not intended to limit the scope of the present application. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A vehicle mounted wireless charging antenna array, characterized by: The first main coil, the second main coil and the auxiliary coil are all runway type coils.

2. The vehicle wireless charging antenna array of claim 1, wherein: The first main coil, the second main coil and the auxiliary coil have the same specifications.

3. The vehicle wireless charging antenna array of claim 2, wherein: The first main coil, the second main coil and the auxiliary coil are all wound 12 turns.

4. The vehicle wireless charging antenna array of claim 1, wherein: The distance between the first main coil and the second main coil is 10±0.5 mm.

5. The vehicle wireless charging antenna array of claim 1, wherein: The center points of the first main coil, the second main coil and the auxiliary coil are located on the same straight line.

6. The vehicle wireless charging antenna array of claim 5, wherein: The distance between the center point of the auxiliary coil and the center point of the first main coil is 25±0.5 mm, and the distance between the center point of the auxiliary coil and the center point of the second main coil is 25±0.5 mm.

7. The vehicle wireless charging antenna array of claim 1, wherein: The length direction of the auxiliary coil is parallel to the width direction of the first main coil and the second main coil.

8. The vehicle wireless charging antenna array of claim 2, wherein: The overall length of the first main coil, the second main coil and the auxiliary coil is 50±1 mm, and the overall width of the first main coil, the second main coil and the auxiliary coil is 40±1 mm.

9. The vehicle wireless charging antenna array of claim 1, wherein: The first main coil, the second main coil and the auxiliary coil all extend outward to form two wire terminals.

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