CN214590777U

CN214590777U - Vehicle-mounted wireless charging equipment

Info

Publication number: CN214590777U
Application number: CN202022455195.2U
Authority: CN
Inventors: 南秀彦; 冯中; 张宝峰; 倪嘉
Original assignee: Delphi Electrical Centers Shanghai Co Ltd
Current assignee: Delphi Electrical Centers Shanghai Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-11-02
Anticipated expiration: 2030-10-29

Abstract

The utility model discloses an on-vehicle wireless battery charging outfit. This on-vehicle wireless charging equipment includes the casing, holds wireless charging coil and the NFC antenna substrate in the casing, and NFC antenna substrate arranges in wireless charging coil top, and wherein, be equipped with electromagnetic shield device on the NFC antenna substrate, electromagnetic shield device is set to electromagnetic shield device and includes the grid type shield that is formed by electrically conductive printing trace, grid type shield sets to the frequency multiplication harmonic of the operating frequency of selective filtration wireless charging coil. Adopt the basis the utility model discloses a need not to increase electronic device, utilize NFC antenna substrate to pass through specific PCB design and can effectively restrain the interference noise, improve the EMC performance, make the product satisfy the requirement.

Description

Vehicle-mounted wireless charging equipment

Technical Field

The invention relates to the technical field of vehicle-mounted electronic products, in particular to vehicle-mounted wireless charging equipment integrated with an electromagnetic shielding body.

Background

In order to improve the usability and user comfort of automobiles, more and more electronic products are integrated in automobiles. In the automotive field, electromagnetic compatibility (EMC) tests for on-board electronics are very stringent. When multiple electronic devices are integrated, interference may exist between each other. Especially, wireless charging device, its operating frequency doubling of frequency harmonic can bring the interference to other equipment through the charging coil radiation in the space, especially 15W charging device, and the exchange of energy during normal operating, radiant energy is higher. This interference can make EMC testing impossible. Equipment suppliers devote significant labor and resources to solving this problem.

There has been an increasing number of OEM customers requiring the inclusion of the CISPR25 standard in EMC testing. However, there are few commercially available 15W wireless charging devices that can pass the CISPR25 class 5 standard directly without technical modification. If this problem is not solved, the charging power of the wireless charging device must be compromised or additional electronic shielding means must be added to the interfered device.

Therefore, improvement of the existing vehicle-mounted wireless charging device is still needed, so that a high-power wireless charging device conforming to the CISPR25 class 5 standard is expected to be obtained.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides vehicle-mounted wireless charging equipment which comprises a shell, a wireless charging coil and an NFC antenna substrate, wherein the wireless charging coil and the NFC antenna substrate are accommodated in the shell, the NFC antenna substrate is arranged above the wireless charging coil, an electromagnetic shielding device is arranged on the NFC antenna substrate, the electromagnetic shielding device comprises a grid type shielding body formed by conductive printed traces, and the grid type shielding body is arranged to selectively filter frequency doubling harmonics of the working frequency of the wireless charging coil.

According to one aspect of the invention, the geometrical features of the grid-type shield have a one-dimensional or two-dimensional periodicity.

According to one aspect of the invention, the electromagnetic shielding means is configured to filter out interference in the frequency band of 0.53MHz to 1.8 MHz.

According to another aspect of the present invention, the electromagnetic shielding means in the vehicle-mounted wireless charging apparatus is set to suppress charging noise around 1.5MHz by 10dB or more.

According to another aspect of the present invention, the power of the in-vehicle wireless charging apparatus is 15W or more.

According to still another aspect of the present invention, the NFC antenna substrate has a top surface and a bottom surface, the top surface and the bottom surface being opposite, the NFC antenna is printed on the top surface of the substrate, and the electromagnetic shielding device is line-printed on the bottom surface of the substrate.

According to yet another aspect of the invention, a spacer is disposed within the housing around an inner periphery of the housing, and the NFC antenna substrate is supported by the spacer, separating the substrate from the wireless charging coil by a gap.

By adopting the NFC antenna substrate, no electronic device is required to be added, interference noise can be effectively inhibited by utilizing the NFC antenna substrate through a specific PCB design, the EMC performance is improved, and the product meets the requirements.

The electromagnetic shielding means thus configured does not have any adverse effect on the operating performance of the NFC module on the wireless charging device.

The solution according to the invention is particularly suitable for retrofitting existing products. Based on the existing product with the NFC function, only the electromagnetic shielding device needs to be added on the NFC substrate, and other mechanism designs do not need to be modified, so that the cost can be obviously increased without increasing the situation. In addition, the scheme of the invention can be used on various wireless charging devices, thereby saving development and debugging cost.

Drawings

Preferred embodiments according to the present invention are described below with reference to the accompanying drawings, in which:

fig. 1 shows a perspective view of an in-vehicle wireless charging apparatus according to the present invention.

Fig. 2 is a schematic diagram showing one-side wiring of the NFC antenna substrate included in the in-vehicle wireless charging apparatus according to the present invention.

Fig. 3 shows a schematic diagram of the other side wiring of the NFC antenna substrate included in the wireless charging device according to the present invention.

List of reference numerals

10 wireless charging device

20 casing

30 charging coil

40 NFC antenna substrate

Detailed Description

The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.

Fig. 1 shows a perspective view of an in-vehicle wireless charging device 10 according to the present invention. The vehicle-mounted wireless charging device 10 is suitable for use in various types of vehicles as a vehicle-mounted device that provides a wireless charging function for a driver or a passenger. The in-vehicle wireless charging device 10 is further provided with an NFC module. The NFC module may perform NFC communication functions in the vehicle-mounted wireless charging device 10 and/or may implement a charging function based on NFC (NFC charging is more suitable for low-power IoT devices, such as smart watches, fitness trackers, wireless earplugs, digital pens, etc.).

As shown in fig. 1, the vehicle-mounted wireless charging device 10 includes a housing 20, the housing 20 having a bottom and a side wall, the bottom and the side wall forming a cavity around them, and a wireless charging coil 30 being accommodated in the cavity of the housing 20. An NFC antenna substrate 40 disposed with an NFC antenna is disposed above the wireless charging coil 30. The antenna substrate 40 is supported and held by a spacer 50 provided at the inner periphery of the cavity of the case 20 such that the substrate 40 is spaced apart from the wireless charging coil 30 by a prescribed distance.

Fig. 2 shows an NFC antenna in the form of a printed trace on the front side of the antenna substrate 40. With reference to fig. 1 and 2, it can be understood that the front surface of the antenna substrate 40 refers to a surface observable in fig. 1. In order to improve the electromagnetic compatibility of the on-board wireless charging device, the wireless charging device according to the invention is in particular provided with electromagnetic shielding means which are arranged to filter out frequency-doubled harmonics of the operating frequency of the wireless charging coil 30. Such electromagnetic shielding means are formed by means of printed tracks on the back side of the antenna substrate 40. Fig. 3 exemplarily shows printed traces on the backside of the antenna substrate 40.

As shown in fig. 3, the conductive printed traces form a grid-type shield. And adjusting or debugging the geometric parameters of the grating as required to filter out the corresponding noise. For example, for a high-power wireless charging device such as 15W, in a preferred embodiment of the present invention, the electromagnetic shielding device disposed on the NFC antenna substrate 40 is designed to filter noise in a frequency band of 0.53MHz to 1.8MHz, and more particularly, the electromagnetic shielding device is designed to filter noise multiplied by 120KHz in a frequency band of 0.53MHz to 1.8 MHz. The electromagnetic shielding device configured as above is advantageous in that the operating frequency of the coil of the wireless charging product is around 120KHz, the frequency multiplication of 120KHz becomes a main noise source of the charging device, and for a high-power wireless charging device, the noise source generates relatively strong energy, and particularly, when the frequency multiplication of the noise is in the range of 0.53MHz to 1.8MHz, the frequency band is an AM use frequency band, and the noise obviously causes AM reception abnormality. Therefore, the embodiment of the invention specially designs the EMC electromagnetic shielding device in the wireless charging equipment so as to effectively filter out the noise sources directly causing AM receiving abnormity in a targeted manner.

In addition, in a preferred embodiment, the electromagnetic shielding device is set to effectively suppress the charging noise of about 1.5MHz by more than 10dB, and the arrangement of the electromagnetic shielding device optimized in this way enables the vehicle-mounted wireless charging device 10 according to the present invention to meet the requirements of the CISPR25 CLASS 5 test.

In a preferred embodiment, the electromagnetic shielding device on the substrate 40 is a grating having an area ranging from about 118mmX to about 69 mm.

Further, as shown in fig. 2 and 3, in the preferred embodiment, the electromagnetic shielding device and the NFC antenna are formed on opposite sides of the substrate. However, the electromagnetic shielding device and the NFC antenna may be formed on the same side surface of the substrate.

The geometric features of the grid-type shield may have one-dimensional or two-dimensional periodicity. Although fig. 3 illustrates the case of one-dimensional periodicity, it is understood that geometric features (i.e., a grid) of two-dimensional periodicity are also possible.

The wireless charging equipment is subjected to EMC performance laboratory tests, and due to the fact that the EMC electromagnetic shielding device is integrated on the NFC antenna substrate 40, in the frequency band of 0.53-1.8 MHz, the average test value of RE tests of the vehicle-mounted wireless charging equipment 10 is smaller than 20dB, VCE tests are smaller than 34dB, and the average test value of CCE tests is smaller than 6 dB.

Due to the popularization of NFC equipment in the existing vehicle-mounted wireless charging equipment, the invention utilizes the NFC antenna substrate to introduce the grid shielding body through a specific PCB design, so that the interference noise can be effectively inhibited, the EMC performance is improved, and the product meets the requirements. By adopting the technical scheme of the invention, components do not need to be added, and the volume of the charging equipment does not need to be increased. It is verified that the electromagnetic shielding means thus set do not have any adverse effect on the working performance of the NFC module on the device.

The technical scheme of the invention is particularly suitable for the transformation of the existing wireless charging equipment. Based on the existing product, only the scheme needs to be added on the NFC substrate, other mechanism designs do not need to be modified, and cost is not increased. In addition, the scheme of the invention can be used on various vehicle-mounted wireless charging equipment, so that the development and debugging cost is saved.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. An in-vehicle wireless charging device includes a housing, a wireless charging coil housed in the housing, and an NFC antenna substrate disposed above the wireless charging coil,

the NFC antenna is characterized in that an electromagnetic shielding device is arranged on the NFC antenna substrate and comprises a grid type shielding body formed by conductive printed traces, and the grid type shielding body is arranged to selectively filter frequency doubling harmonics of the working frequency of the wireless charging coil.

2. The vehicle wireless charging apparatus of claim 1, wherein the geometric features of the grid-type shield have one-dimensional or two-dimensional periodicity.

3. The vehicle-mounted wireless charging device according to claim 1 or 2, wherein the electromagnetic shielding means is set to filter out interference of a frequency multiplication harmonic in a frequency band range of 0.53MHz to 1.8 MHz.

4. The vehicle-mounted wireless charging apparatus according to claim 1 or 2, wherein the electromagnetic shielding means is provided to suppress charging noise in the vicinity of 1.5MHz by 10dB or more.

5. The vehicle-mounted wireless charging device according to claim 1 or 2, wherein the power of the wireless charging device is 15W or more.

6. The vehicle-mounted wireless charging apparatus according to claim 1 or 2, wherein the NFC antenna substrate has a top surface and a bottom surface, the top surface and the bottom surface being opposed,

the NFC antenna is printed on the top surface of the substrate, and the electromagnetic shielding device is printed on the bottom surface of the substrate in a circuit mode.

7. The vehicle-mounted wireless charging apparatus according to claim 1 or 2, wherein a spacer is provided inside the housing around an inner periphery of the housing, the NFC antenna substrate being supported by the spacer, separating the substrate from a wireless charging coil by a gap.