WO2021114076A1

WO2021114076A1 - Wireless charging module

Info

Publication number: WO2021114076A1
Application number: PCT/CN2019/124273
Authority: WO
Inventors: 刘泽南; 汪宗; 陈勇利
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2021-06-17

Abstract

Disclosed is a wireless charging module (100), the wireless charging module (100) comprising a battery (10), a magnetic conductive sheet (20), a primary coil (30), a secondary coil (40) and a transmitting element (50), wherein the magnetic conductive sheet (20) is attached between the battery (10) and the secondary coil (40), the primary coil (30) is arranged at an interval on a side of the secondary coil (40) that is away from the magnetic conductive sheet (20), the transmitting element (50) is attached to a side of the primary coil (30) that is away from the secondary coil (40), the secondary coil (40) is annular, the magnetic conductive sheet (20) is provided with a center area (11) corresponding to a center hole of the secondary coil (40), and a plurality of heat dissipation through holes (12) are provided at the periphery of the center area (11) on the magnetic conductive sheet (20). In consideration of heat dissipation, the heat dissipation through holes (12) are provided in the magnetic conductive sheet (20) by means of die cutting, such that on the premise of not affecting performance, the wireless charging module (100) can be helped to carry out effective heat dissipation, temperature rise of the coils is slowed down, and the usage experience is prevented from being affected due to a module generating heat in an obvious way.

Description

Wireless charging module

Technical field

The utility model relates to the field of wireless charging, in particular to a wireless charging module.

Background technique

Wireless charging technology, also known as non-contact inductive charging, is based on the principle of inductive coupling, in which the power supply equipment transmits energy to the electrical equipment, and the electrical equipment uses the energy to charge the battery.

At present, wireless charging technology mainly has the following three forms: magnetic induction, magnetic resonance and radio wave. From these technologies, there are three major wireless charging standard alliances, including Qi, A4WP and PMA, Qi and PMA. It is based on magnetic induction technology, and the A4WP protocol is based on magnetic resonance technology. At present, A4WP and PMA have merged into AirFuel Alliance (AFA) to promote a unified wireless charging standard.

The current traditional wireless charging module structure is relatively similar, mainly divided into PET layer, coil layer, nanocrystalline layer, graphite sheet layer and glue layer.

Most of the wireless charging modules on the market in the working environment with high transmission power of the whole machine, the heating of the module is more obvious, especially the nanocrystalline layer, which affects the use experience to a certain extent.

Therefore, it is necessary to provide a wireless charging module that can help the module to effectively dissipate heat without affecting performance.

technical problem

The purpose of the present utility model is to provide a wireless charging module, which aims to help the module to effectively dissipate heat without affecting the performance.

Technical solutions

The technical scheme of the utility model is as follows:

A wireless charging module includes a battery, a magnetic sheet, a primary coil, a secondary coil, and a transmitting element, the magnetic sheet is attached between the battery and the secondary coil, The primary coil is arranged at intervals on the side of the secondary coil away from the magnetic conductive sheet, the transmitting element is attached to the side of the primary coil away from the secondary coil, and the secondary coil is in a ring shape. The magnetic conductive sheet has a central area corresponding to the central hole of the secondary coil, and a plurality of heat dissipation through holes are opened on the magnetic conductive sheet around the central area.

Further, the magnetic conductive sheet is a nanocrystalline magnetic conductive sheet.

Further, a plurality of the heat dissipation through holes are distributed at intervals along the circumferential direction.

Further, a plurality of the heat dissipation through holes are distributed at equal intervals.

Further, a plurality of the heat dissipation through holes are arranged in multiple rows.

Further, the magnetic conductive sheet is circular.

Further, the central area is circular.

Further, the heat dissipation through hole is circular.

Beneficial effect

The beneficial effect of the utility model is that the design is based on heat dissipation considerations, and the heat dissipation through holes are die-cut on the magnetic conductive sheet, which can help the wireless charging module to effectively dissipate heat without affecting the performance, and is used to slow the temperature rise of the coil , To avoid the obvious heating of the module, which will affect the use experience.

Description of the drawings

Figure 1 is a schematic structural diagram of a wireless charging module provided by an embodiment of the utility model;

Figure 2 is an exploded view of the wireless charging module in Figure 1;

Figure 3 is a cross-sectional view along line A-A of Figure 1;

4 is a schematic diagram of the structure of the magnetic conductive sheet in an embodiment of the utility model;

5 is a schematic diagram of the structure of the magnetic conductive sheet in another embodiment of the present invention;

Figure 6 is a schematic view of the structure of the magnetic conductive sheet in another embodiment of the present invention;

Fig. 7 is a schematic diagram of the magnetic field lines of the magnetic field where the magnetic conductive sheet is located.

In the picture:

100. Wireless charging module; 10. Battery; 20. Magnetic sheet; 30. Primary coil; 40. Secondary coil; 401. Center hole; 50. Transmitting element; 11. Central area; 12. Heat dissipation through hole.

Embodiments of the present invention

The present utility model will be further explained below in conjunction with the drawings and embodiments.

1 to 3, a wireless charging module 100 includes a battery 10, a magnetic sheet 20, a primary coil 30, a secondary coil 40, and a transmitting element 50. The magnetic sheet 20 is attached to the battery 10 and the secondary coil 40, the primary coil 30 is arranged at an interval on the side of the secondary coil 40 away from the magnetic conductive sheet 20, and the transmitting element 50 is attached to the primary coil 30 far away One side of the secondary coil 40.

The wireless charging module 100 provided in this embodiment adopts the principle of electromagnetic induction, and realizes energy transmission through energy coupling through coils. The primary coil 30 and the transmitting element 50 constitute the transmitting end, and the secondary coil 40, the magnetic sheet 20 and the battery 10 constitute the receiving end. The sending end is installed in the charging base, and the receiving end is installed in an electronic device, which is generally small portable electronic devices such as electric toothbrushes, mobile phones, and cameras. The primary coil 30 is connected to a wired power source to generate electromagnetic signals, and the secondary coil 40 induces the electromagnetic signals at the transmitting end to generate current to charge the battery 10; a magnetic sheet 20 is placed at the receiving end to prevent the attenuation and interference of the metal conductor to the magnetic field and play a role of metal isolation , Prevent energy waste and improve charging efficiency.

Please refer to 3-6, the secondary coil 40 has a ring shape, the magnetic sheet 20 has a central area 11 corresponding to the central hole 401 of the secondary coil 40, and the central area on the magnetic sheet 20 A plurality of heat dissipation through holes 12 are opened around 11. The nanocrystalline material located directly under the receiving coil area is hollowed out, and the central area 11 needs to be avoided when hollowing out; it is understandable that since the area outside the inner diameter has a sparse distribution of magnetic field lines in the Z-axis direction, this treatment is not It will affect the performance. Specifically, please refer to Figure 7. The lines represent the magnetic field lines, and the direction indicated by the arrows is the direction of the magnetic field lines. The magnetic field gradually weakens from the center to the outside.

Preferably, the magnetic conductive sheet 20 is a nanocrystalline magnetic conductive sheet.

In one embodiment, referring to FIGS. 5 and 6, a plurality of the heat dissipation through holes 12 are distributed at intervals along the circumferential direction. Preferably, a plurality of the heat dissipation through holes 12 are distributed at equal intervals. According to different use environments, by controlling the aperture and number of the heat dissipation through holes 12, the wireless charging module 100 suitable for various working environments can be optimized. Figures 5 and 6 show that: for different use environments, through heat dissipation The aperture control of the through hole 12 can optimize the wireless charging module 100 suitable for different working environments.

In another embodiment, referring to FIG. 4, the plurality of heat dissipation through holes 12 are arranged in multiple rows.

Preferably, the magnetic conductive sheet 20 has a circular shape.

Preferably, the central area 11 has a circular shape.

Preferably, the heat dissipation through hole 12 is circular.

In this design, based on the heat dissipation consideration of the wireless charging module 100, a heat dissipation through hole 12 is die-cut on the nanocrystalline material directly below the secondary coil 40 to slow the temperature rise of the coil. In the module production, whether it is the traditional litz wire winding model, the FPC wiring model or the solution of laser engraving the coil on the ceramic back cover through the LDS method, the above solution can be adopted. According to different use environments, by controlling the aperture and number of the heat dissipation through holes 12, the wireless charging module 100 suitable for various working environments can be optimized.

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to The scope of protection of the utility model.

Claims

A wireless charging module includes a battery, a magnetic sheet, a primary coil, a secondary coil, and a transmitting element, the magnetic sheet is attached between the battery and the secondary coil, The primary coil is arranged at intervals on the side of the secondary coil away from the magnetic conductive sheet, and the transmitting element is attached to the side of the primary coil away from the secondary coil, wherein the secondary coil The secondary coil has a ring shape, the magnetic conductive sheet has a central area corresponding to the central hole of the secondary coil, and a plurality of heat dissipation through holes are opened on the magnetic conductive sheet around the central area.
The wireless charging module according to claim 1, wherein the magnetic conductive sheet is a nanocrystalline magnetic conductive sheet.
The wireless charging module according to claim 1, wherein a plurality of the heat dissipation through holes are distributed at intervals along the circumferential direction.
3. The wireless charging module of claim 3, wherein a plurality of the heat dissipation through holes are distributed at equal intervals.
The wireless charging module according to claim 1, wherein the plurality of heat dissipation through holes are arranged in multiple rows.
The wireless charging module according to claim 1, wherein the magnetic conductive sheet is circular.
The wireless charging module according to claim 1, wherein the central area is circular.
The wireless charging module of claim 1, wherein the heat dissipation through hole is circular.

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