CN112838684A

CN112838684A - Shielding structure for wireless charging transmitter

Info

Publication number: CN112838684A
Application number: CN201911155714.9A
Authority: CN
Inventors: 修罗; 姚斌
Original assignee: Valeo Comfort and Driving Assistance SAS
Current assignee: Valeo Comfort and Driving Assistance SAS
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2021-05-25

Abstract

The invention relates to a shielding structure (11) for a wireless charging transmitter (1), comprising a plurality of different pattern regions (11) configured to shield electric E-field radiation but allow magnetic H-field radiation associated with the electric E-field radiation to pass through the shielding structure (11), wherein the shielding structure (11) comprises at least three pattern regions (11)_i) Said at least three pattern areas (11)_i) All electrically connected to the same reference potential (14) via at least three separate connection points (ci), respectively, and wherein the at least three pattern areas (11)_i) Has irregular stripe structure (110)_i)。

Description

Shielding structure for wireless charging transmitter

Technical Field

The invention relates to a shielding structure for a wireless charging transmitter. Such a structured shielding layer may be used, but is not limited to, in a motor vehicle.

Background

Shielding structures for wireless charging transmitters known to those skilled in the art are used in vehicles to charge wireless portable devices such as smartphones. Such a shielding structure is a comb-like structure and is configured to shield electric E-field radiation, but to allow magnetic H-field radiation associated with the electric E-field radiation to pass through the comb-like structure. The comb structure includes a first pattern region electrically connected to a reference potential and a second pattern region electrically connected to the same reference potential through the first pattern region. Therefore, the first pattern region and the second pattern region are connected to the reference potential using the same electrical connection point.

A problem with this prior art is that when a failure, such as a disconnection, occurs at the electrical connection point connecting the first pattern region and the second pattern region, the comb-like structure is no longer used as a shield against electric E-field radiation. Since the electric E-field radiation is harmful to the human body, the safety of the user of the wireless portable device is no longer ensured.

Disclosure of Invention

It is an object of the present invention to provide a shielding structure for a wireless charging transmitter and a wireless charging transmitter which solve the above problems.

To this end, a shielding structure for a wireless charging transmitter is provided, comprising a plurality of different pattern areas configured to shield electric E-field radiation but allow magnetic H-field radiation associated with the electric E-field radiation to pass through the shielding structure, wherein the shielding structure comprises at least three pattern areas, all of which are electrically connected to the same reference potential via at least three separate connection points, respectively, and wherein the at least three pattern areas have an irregular stripe organization.

As we will see in further detail, the shielding structure of the wireless charging transmitter may decide whether to keep the charging operation function or disable the charging operation for the electric E-field radiation depending on the number of individual connection points disconnected from the reference potential. Thus, when only one pattern area no longer functions as a shield due to its individual connection point being broken, it may be decided whether to keep the charging operation or disable it.

According to a non-limiting embodiment of the present invention, the shielding structure for a wireless charging transmitter according to the present invention further includes the following features.

In a non-limiting embodiment, the irregular stripe pattern is arranged according to a pseudo-random rule.

In a non-limiting embodiment, the stripes of the irregular stripe pattern are arranged according to a non-repeating pattern from one pattern area to another pattern area.

In a non-limiting embodiment, the at least three pattern regions are conductive material.

In a non-limiting embodiment, stripes of irregular stripe patterns are printed on the conductive substrate.

In a non-limiting embodiment, the reference potential is ground.

In a non-limiting embodiment, the stripes of the irregular stripe pattern are the same size.

In a non-limiting embodiment, the thickness of the striations of the irregular striation texture is from 0.14 mm to 0.19 mm.

In a non-limiting embodiment, the stripes of irregular striped tissue are spaced apart by 0.18 millimeters to 0.25 millimeters.

In a non-limiting embodiment, the at least three pattern areas are staggered and arranged on a single layer to obtain a regularly distributed striped layer.

In a non-limiting embodiment, the at least three pattern areas are arranged on at least two different layers to obtain a shielding structure with regularly distributed stripes when the at least two different layers are superimposed on each other.

In a non-limiting embodiment, the shielding structure includes three pattern regions.

In a non-limiting embodiment, the shielding structure includes four pattern regions.

In a non-limiting embodiment, the four pattern areas are each arranged on a different layer to obtain a shielding structure with regularly distributed stripes.

In a non-limiting embodiment, the four pattern areas are arranged two by two on two layers to obtain a shielding structure with regularly distributed stripes.

There is also provided a wireless charging transmitter comprising:

-a wireless charging module configured to generate magnetic H-field radiation and wirelessly charge a wireless portable device, an

-at least one shielding structure comprising a plurality of different pattern areas arranged between the wireless charging module and the wireless portable device and configured to shield electric E-field radiation but allow magnetic H-field radiation related to electric E-field radiation to pass through the structured shielding layer, wherein the shielding structure comprises at least three pattern areas all electrically connected to the same reference potential via three different connection points, and wherein the at least three pattern areas have an irregular stripe organization.

According to a non-limiting embodiment of the present invention, the wireless charging transmitter according to the present invention further comprises the following features.

In a non-limiting embodiment, the shielding structure is configured to shield the wireless portable device from electrical E-field radiation associated with magnetic H-field radiation.

In a non-limiting embodiment, the at least one shielding structure is located between the wireless charging module and the wireless portable device.

Drawings

Some embodiments of methods and/or apparatus according to embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

figure 1 is a schematic diagram showing a wireless charging transmitter with a shielding structure according to a non-limiting embodiment of the present invention,

FIG. 2a is a schematic view showing a shielding structure comprising three pattern areas with irregular stripe organization according to a first non-limiting embodiment of the present invention,

FIG. 2b is a schematic diagram showing a patterned area of the shielding structure of FIG. 2a with an irregular striped organization according to a non-limiting embodiment,

FIG. 3 is a schematic diagram showing a pseudo-random rule for arranging stripes of the irregular stripe pattern of FIG. 2a according to a non-limiting embodiment,

FIG. 4 is a schematic diagram showing three pattern areas with irregular stripe organization of FIG. 2a, each pattern area being arranged on a unique layer, according to a first variant of a non-limiting embodiment,

FIG. 5 is a schematic diagram showing three pattern areas with irregular stripe pattern of FIG. 2a, each pattern area being arranged on a different layer, according to a second variant of a non-limiting embodiment,

FIG. 6 is a schematic view showing a shielding structure comprising four pattern areas according to a second non-limiting embodiment of the invention,

FIG. 7 is a schematic diagram showing a pseudo-random rule for arranging stripes of the irregular stripe pattern of FIG. 6 according to a non-limiting embodiment,

FIG. 8 is a schematic diagram showing four pattern areas with irregular stripe patterns of FIG. 6, each pattern area being arranged on a unique layer, according to a first variant of a non-limiting embodiment,

FIG. 9 is a schematic diagram showing four pattern areas with the irregular stripe pattern of FIG. 6, each pattern area being arranged on a different layer, according to a second non-limiting variant of embodiment,

fig. 10 is a schematic view showing four pattern areas with the irregular stripe pattern of fig. 6, arranged two by two on two different layers, according to a third non-limiting variant of embodiment.

Detailed Description

In the following description, well-known functions or constructions by those skilled in the art are not described in detail since they would obscure the invention in unnecessary detail.

The present invention relates to a shielding structure 11 for a wireless charging transmitter 1, according to a non-limiting embodiment, as shown in fig. 1 to 10. The wireless charging transmitter 1 may be used for a vehicle. In a non-limiting embodiment, the vehicle is an automobile. In a non-limiting example, the automobile is a motor vehicle or an electric vehicle or a hybrid vehicle.

As shown in fig. 1, the wireless charging transmitter 1 includes:

-a wireless charging module (10) for charging a battery,

-a shielding structure 11 for shielding the light emitted by the light source,

electronic commands 13 for controlling the wireless charging operation.

In a non-limiting embodiment, the wireless charging transmitter 1 further comprises a housing 15 and a ferrite sheet 16. In a non-limiting embodiment, the housing 15 is made of aluminum or magnesium. In a non-limiting embodiment, it is placed in the center console of the vehicle. The housing 15 is connected to the ground of the vehicle. The ferrite sheet 16 is placed below the coil antenna 100 described later and above the electronic command 13 to protect it from magnetic induction interference.

The wireless charging module 10 is placed in the case 15. The wireless charging module 10 is electrically coupled to a power source (not shown) of the vehicle. The wireless charging module 10 includes at least one coil antenna 100 that converts power provided by a power source into electromagnetic radiation. Thus, the wireless charging module 10 is configured to generate electromagnetic radiation and wirelessly charge the wireless portable device 2, the wireless portable device 2 comprising a battery 20. In a non-limiting embodiment, the wireless charging module 10 includes three coil antennas 100. It provides a larger active charging surface for wireless charging functions. Electromagnetic radiation consists of magnetic H-field radiation (labeled H in fig. 1) and electric E-field radiation (labeled E in fig. 1). The magnetic H-field radiation is configured to charge the battery 20 of the wireless portable device 2 when the user places the wireless portable device 2 in proximity to or in contact with the wireless charging transmitter 1. Electric E-field radiation can increase human body temperature and is therefore harmful to humans. Due to the shielding structure 11, the user safety of the wireless portable device 2 is secured. Thanks to the shielding structure 11, the wireless charger function may meet the ICNIRP international non-ionising radiation protection commission guidelines published in 1998 for limiting exposure to time-varying electric, magnetic and electromagnetic fields (up to 300GHz) and up to the 2009 ICNIRP statement. Thus, the shielding structure 11 is configured to shield the vicinity of the wireless charger transmitter from electric field radiation.

In a non-limiting embodiment, the wireless portable device 2 is a smartphone. In the following, this non-limiting embodiment is to be regarded as a non-limiting example.

The shielding structure 11 is configured to shield the wireless portable device 2 from electrical E-field radiation associated with magnetic H-field radiation. As shown in fig. 1, the shielding structure 11 rests on the housing 15. In a non-limiting example, it is welded or snapped onto the housing 15. The shielding structure 11 is interposed between the wireless charging module 10 and the wireless portable device 2. A shielding structure 11 is arranged on top of the wireless charging module 10 to filter the electric E-field radiation from said wireless charging module 10. The electric E-field radiation is attenuated by the shielding structure 11, while the magnetic H-field radiation is largely unaffected by the shielding structure 11, so that its energy wirelessly charges the smartphone 2. As shown, in a non-limiting embodiment, the smartphone 2 is placed on top of the shielding structure 11. In the non-limiting embodiment shown in fig. 1, the wireless charging transmitter 1 further comprises a cushion 15 for placing the smartphone 2, so as to avoid direct contact of said smartphone 2 with the shielding structure 11. Note that the cushion 15 is mainly a fashion part, intended to cover the part thereunder and provide a soft adhesion function to prevent the smartphone 2 from slipping due to vibration while the vehicle is running.

As shown in fig. 2a and 6, the shielding structure 11 includes at least three pattern regions 11_iN, where N is an integer. In a first non-limiting embodiment, shown in FIG. 2a, it comprises three pattern areas 11₁、11₂、11₃. In a second non-limiting embodiment, shown in FIG. 6, it comprises four pattern areas 11₁、11₂、11₃、11₄. The four pattern areas ensure a robust shielding of the electric E-field radiation according to the ICNIRP guidelines. Further, as described later, since each pattern region 11₁、11₂、11₃、11₄Independently to a reference potential 14, here a ground on the housing 15 via its connection point c, which allows the shielding structure 11 to rest stably in the housing 15 above the coil antenna 100.

At least three pattern regions 11_iAll electrically connected to the same reference potential 14 via at least three separate connection points ci. In fig. 2a, three pattern areas 11₁、11₂、11₃All electrically connected to the same reference potential 14 via three separate connection points c1, c2, c 3. In fig. 6, four pattern regions 11₁、11₂、11₃、11₄All electrically connected to the same reference potential 14 via four separate connection points c1, c2, c3, c 4.

In a non-limiting embodiment, the reference potential 14 is ground GND. In a non-limiting embodiment, at least three individual connection points ci are soldered on the reference potential 14.

Having a plurality of individual connection points c avoids losing the shielding function against electric E-field radiation in case one or both of the individual connection points c are disconnected or loose in contact with the reference potential 14. Thus, when one or two separate connection points c (in fig. 2 a) or one to three separate connection points ci (in fig. 3) are disconnected, it may be selected to keep the wireless charging of the smartphone 2 or to stop the wireless charging operation. Depending on the missing connection point ci, that is to say no longer connected to the reference potential 14, the current in the coil antenna 100 can be switched off. In practice, at least three pattern areas 11_iInterleaved with each other to cover the entire wireless charging surface, i.e. the surface defined by at least one coil antenna 100 (here in a non-limiting example by three coil antennas 100).

When all of the at least three connection points ci are broken, the shielding structure 11 is no longer able to ensure its shielding function. Thus, the current in the coil antenna 100 is turned off. Thus, the wireless charging operation is stopped. In a non-limiting embodiment, the electronic command 13 of the wireless charging transmitter 1 is configured to turn off the current, thereby stopping the wireless charging operation. In a non-limiting embodiment, a diagnostic message is sent to the electronic control unit (not shown) of the vehicle to alert the user to the failure of the shielding structure 11. Thus, each individual connection point ci can be diagnosed to detect whether it is still connected to the reference potential 14. It is well known to the person skilled in the art to check whether the individual connection points have the same potential as the reference potential; therefore, the description thereof is omitted.

It should be noted that in a non-limiting example, pattern area 11_iIs a conductive material such as a metal. In a non-limiting embodiment, they are made of copper.

As shown in fig. 2b, pattern area 11_iWith irregular striation texture 110_i. Thus, in the first non-limiting embodiment shown in FIG. 2a, three pattern areas 11₁、11₂And 11₃With irregular striation texture 110₁、110₂And 110₃. Second non-limiting shown in FIG. 6In the exemplary embodiment, four pattern areas 11₁、11₂、11₃And 11₄With irregular striation texture 110₁、110₂、110₃And 110₄. Therefore, when a pattern area 11_iWhen disconnected due to a disconnection fault at point c, the shielding structure 11 is still effective, since it still covers the entire surface of the wireless charging function. Due to the irregular fringe distribution, no large holes are created in the shielding structure 11 through which the electric E-field radiation can pass. In a non-limiting embodiment, the shielding structure 11 includes about two hundred stripes s. The stripes s are configured to filter the electric E-field radiation, which thus follows a path through said stripes s to a reference potential 14, which reference potential 14 is in a non-limiting example ground. Thus, the electric E-field radiation is absorbed by the ground 14, eventually leading to a safe wireless charging operation immediately around.

Irregular striped tissue 110_iArranged according to a pseudo-random rule R. As shown in fig. 3, for three pattern regions 11₁、11₂And 11₃Each irregular stripe pattern 110₁、110₂And 110₃Including three stripes s. In a non-limiting example, irregular striped tissue 110₁Including stripes s4, s7, and s8, irregular stripe pattern 110₂Including stripes s1, s3, and s6, and irregular stripe pattern 1103 includes stripes s2, s5, and s 9. As shown in fig. 7, for four pattern regions 11₁、11₂、11₃And 11₄Each irregular stripe pattern 110₁、110₂、110₃And 110₄Including three stripes s. In a non-limiting example, irregularly striped tissue 1101 includes stripes s6, s8, and s11, irregularly striped tissue 1102 includes stripes s1, s5, and s12, irregularly striped tissue 1103 includes stripes s2, s4, and s10, and irregularly striped tissue 1104 includes stripes s3, s7, and s 9. It should be noted that fig. 3 and 7 only show the pattern region 11₁、11₂、11₃、11₄Of different irregular stripe patterns 110₁、110₂、110₃、110₄Is part of the stripe s of (a).

In a non-limiting embodiment, the stripes s are the same size. In a non-limiting embodiment, the thickness of the striations s is 0.14 mm to 0.19 mm. The thinner the strip s, the better the permeability. In fact, it limits some of the magnetic losses caused by the metal blocks. In a non-limiting embodiment, the irregular striped tissue 110 when assembled_iAll of the at least three pattern areas 11_iAt first, irregular stripe pattern 110_iAre spaced apart by 0.18 mm to 0.25 mm. The spacing e between each stripe s is regular. As shown, in a non-limiting embodiment, the irregular striped tissue 110_iAre parallel to each other. This creates a striped s-net and avoids large holes within the shielding structure 11 through which the electric E-field radiation can pass.

As shown, in a non-limiting embodiment, the irregular striped tissue 110_iAccording to the pattern area 11 from one pattern area_iTo another pattern area 11_iIs arranged in a non-repeating pattern.

When all the pattern regions 110_iWhen assembled together, a shielding structure 11 is obtained with a regular distribution of stripes s as shown in the first non-limiting embodiment of fig. 2 and in the second non-limiting embodiment of fig. 6. Note that in these figures, the layer 12 (described below) is not shown. The regular distribution allows to establish an efficient filter of the electric E-field radiation emitted by the wireless charging module 10 below the shielding structure 11. In the break-off and pattern region 11_iIn the case of any one of the associated connection points ci, the pattern areas no longer effectively filter the electric E-field radiation, but the shielding function is not completely lost due to the regular distribution of the stripes s over the shielding structure 11 and the shielding structure 11 can still ensure its shielding function. Since the stripes s are regularly distributed, the spaces between the stripes s are also regularly distributed. It allows the magnetic H-field radiation radiated by the wireless charging module 10 to pass through the shielding structure 11 almost unhindered.

At least three pattern regions 11_iIs disposed on at least one layer 12. The at least one layer 12 is integrated in an electrically conductive substrate 17 as shown in fig. 5 and 9, also referred to as electrically conductive substrate 17.

In a non-limiting embodiment, the reference potential 14 is the ground of the conductive substrate 17. In a non-limiting embodiment, the ground of the conductive substrate 17 is the housing 15. In a non-limiting embodiment, the conductive substrate 17 is a printed circuit board, also referred to as a PCB. In another non-limiting embodiment, the conductive plate is a flexible printed circuit, also known as an FPC. Thus, in a non-limiting embodiment, at least three pattern areas 11_i Irregular stripe structure 110_iIs printed on the conductive substrate 17. The stripes s may be printed using any printing technique, such as a copper coating in a non-limiting example.

In a first non-limiting variant of embodiment, at least three pattern areas 11_iStaggered and arranged on a single layer 12 to obtain a shielding structure 11 with regularly distributed stripes s. Thus, three pattern regions 11 are shown in FIG. 4₁、11₂、11₃In the first non-limiting embodiment of (1), it can be seen that when there are three pattern areas 11₁、11₂、11₃When interleaved, the stripes s are regularly distributed. Which corresponds to the four pattern areas 11 shown in fig. 8₁、11₂、11₃、11₄As in the second non-limiting embodiment. It can be seen that when four pattern areas 11 are provided₁、11₂、11₃、11₄When interleaved, the stripes s are regularly distributed. The shielding structure 11 is then made of a single layer 12.

In a second non-limiting variant of embodiment, at least three pattern areas 11_iEach arranged in a different layer 12_iSo as to form said different layer 12_iWhen superimposed a shielding structure 11 with regularly distributed stripes s is obtained. Thus, three pattern regions 11 are shown in FIG. 5₁、11₂、11₃In the first non-limiting embodiment of (1), it can be seen that when each includes a pattern area 11, respectively₁、11₂、11₃Three layers 12 of₁、12₂、12₃When to be superimposed, the stripes s will be regularly distributed. The shielding structure 11 is composed of three layers 12₁、12₂、12₃And (4) forming. In non-limiting embodimentsThe layers are laminated in a PCB or glued in an FPC.

With four pattern areas 11₁、11₂、11₃、11₄As in the second non-limiting embodiment. It can be seen that each includes a pattern area 11₁、11₂、11₃、11₄Four layers 12 of₁、12₂、12₃、12₄When to be superimposed, the stripes s are regularly distributed. The shielding structure 11 is composed of four layers 12₁、12₂、12₃、12₄And (4) forming.

As shown in fig. 10, in four pattern regions 11₁、11₂、11₃、11₄In a third non-limiting variation of the second non-limiting embodiment, four pattern areas 11₁、11₂、11₃、11₄Arranged in two different layers 12₁、12₂So as to form the two layers 12₁、12₂When superimposed a shielding structure 11 with regularly distributed stripes s is obtained. This reduces the need to drill holes in the conductive substrate 17, also referred to as vias when the conductive substrate 17 is a PCB. It can be seen that the pattern regions 11 are included when they are included respectively₁、11₂And 11₃、11₄Two layers 12 of₁、12₂When superimposed, the stripes s are regularly distributed. The shielding structure 11 is composed of two layers 12₁、12₂And (4) forming.

It is to be understood that the present invention is not limited to the above-described embodiments, and variations and modifications may be made without departing from the scope of the present invention. This will be explained below.

Thus, in another non-limiting embodiment, the shielding structure 11 may include only two pattern regions 11₁、11₂Both electrically connected to the same reference potential 14 via two separate connection points c1, c2, the first pattern region 11₁And the second pattern region 11₂With irregular striation texture 110₁、110₂。

Thus, in another non-limiting embodiment, the shielding structure 11 may comprise more than four separate connection points ci.

Thus, in another non-limiting embodiment, the irregular striped tissue 110_iMay be non-parallel but have a corrugated shape or may be parallel but diagonally placed at the boundary of the layer 12 constituting the shielding structure 11.

Accordingly, some embodiments of the invention may include one or more of the following advantages:

it complies with the ICNIRP guidelines and protects the user from the electric E-field generated by the wireless charging transmitter,

it has the ability to diagnose different individual connection points ci to decide whether to stop the wireless charging function or not,

contrary to the prior art, even the pattern area 11_iOne of which is no longer functional due to failure of its associated connection point ci, it also allows the shielding structure 11 to perform its shielding function,

contrary to the prior art, it allows to have a shielding structure 11 that functions in full mode or derated mode, which also allows to protect the user from the E-field.

Claims

1. A shielding structure (11) for a wireless charging transmitter (1), comprising a plurality of different pattern areas (11) configured to shield electric E-field radiation but allow magnetic H-field radiation related to electric E-field radiation to pass through the shielding structure (11), wherein the shielding structure (11) comprises at least three pattern areas (11)_i) Said at least three pattern areas (11)_i) All via at least three separate connection points (c), respectively_i) Are electrically connected to the same reference potential (14), and wherein the at least three pattern regions (11)_i) Has irregular stripe structure (110)_i)。

2. The shielding structure (11) according to claim 1, wherein the irregular striped structure (110)_i) Arranged according to a pseudo-random rule (R).

3. The shielding structure (11) according to any one of the preceding claims, wherein the irregular striped tissue (110)_i) According to a pattern region (11)_i) To another pattern area (11)_i) Is arranged in a non-repeating pattern.

4. Shielding structure (11) according to any one of the preceding claims, wherein said at least three pattern areas (11)_i) Is a conductive material.

5. The shielding structure (11) according to any one of the preceding claims, wherein the irregular striped tissue (110)_i) Is printed on a conductive substrate (17).

6. Shielding structure (11) according to any one of the preceding claims, wherein the reference potential (14) is ground.

7. The shielding structure (11) according to any one of the preceding claims, wherein the irregular striped tissue (110)_i) The stripes(s) of (a) are of the same size.

8. The shielding structure (11) according to any one of the preceding claims, wherein the irregular striped tissue (110)_i) The thickness of the stripes(s) of (a) is from 0.14 mm to 0.19 mm.

9. The shielding structure (11) according to any one of the preceding claims, wherein the irregular striped tissue (110)_i) Are spaced apart by 0.18 mm to 0.25 mm.

10. Shielding structure (11) according to any one of the preceding claims, wherein said at least three pattern areas (11)_i) Staggered and arranged on a single layer (12) to obtain a regular distribution of layers of stripes(s).

11. According to the preceding claimThe shielding structure (11) according to any one of claims 1 to 10, wherein said at least three pattern areas (11)_i) Arranged in at least two different layers (12)_i) When said at least two different layers (12) are present_i) When superimposed on each other, a shielding structure (11) with regularly distributed stripes(s) is obtained.

12. The shielding structure (11) according to any one of the preceding claims, wherein the shielding structure (11) comprises three pattern areas (11)₁、11₂、11₃)。

13. The shielding structure (11) according to any one of the preceding claims, wherein the shielding structure (11) comprises four pattern areas (11)₁、11₂、11₃、11₄)。

14. Shielding structure (11) according to the preceding claim, wherein the four pattern regions (11)₁、11₂、11₃、11₄) Each arranged in a different layer (12)₁、12₂、12₃、12₄) To obtain a shielding structure (11) with regularly distributed stripes(s).

15. Shielding structure (11) according to the preceding claim 13, wherein said four pattern areas (11)₁、11₂、11₃、11₄) Arranged in two layers (12)₁、12₂) To obtain a shielding structure (11) with regularly distributed stripes(s).

16. A wireless charging transmitter (1) comprising:

-a wireless charging module (10) configured to generate magnetic H-field radiation and wirelessly charge a wireless portable device (2), an

-at least one shielding structure (11) comprising a plurality of different pattern areas (11)_i) The pattern area is arranged on the wireless charging module (1)0) And a wireless portable device (2) and configured to shield electric E-field radiation, but to allow magnetic H-field radiation associated with the electric E-field radiation to pass through the structured shielding layer (1), wherein the shielding structure (11) comprises at least three pattern regions (11)_i) Said at least three pattern areas (11)_i) All electrically connected to the same reference potential (14) via three different connection points (ci), and wherein the at least three pattern areas (11)_i) Has irregular stripe structure (110)_i)。

17. The wireless charging transmitter (1) according to the preceding claim, wherein the shielding structure (11) is configured to shield the wireless portable device (2) from electric E-field radiation related to magnetic H-field radiation.

18. The wireless charging transmitter (1) according to any of the preceding claims 16 or 17, wherein the at least one shielding structure (11) is located between the wireless charging module (10) and the wireless portable device (2).