Wireless charging coil module

Abstract

The utility model discloses a wireless charging coil module, which comprises a base provided with a first surrounding-shaped concave part and a second surrounding-shaped concave part surrounding the first surrounding-shaped concave part; the sensing coil is arranged in the first surrounding-shaped concave part; the magnet is arranged in the second surrounding-shaped concave part; wherein the base is integrally formed by ferrite, so that the wireless charging device has higher efficiency and low temperature rise, and the reliability, the safety and the convenience are improved.

Description

Technical Field

[0001] The utility model relates to a charging coil module, in particular to a wireless charging coil module. Background Art

[0002] Wireless charging devices use a transmitting coil to emit an electromagnetic field, which causes the sensor coil of the electronic device to sense the electromagnetic field and then charge according to Faraday's law. With the development of wireless charging technology, portable electronic devices such as mobile phones and smart watches can be charged by wireless charging, which improves the convenience of charging.

[0003] However, the sensor coil of the electronic device and the transmitting coil of the wireless charging device are limited in alignment and distance, which leads to problems such as charging speed, charging efficiency, charging distance, product temperature rise, etc. during the wireless charging process, thus limiting the use of wireless charging.

[0004] Therefore, how to improve the Q value of wireless charging devices, reduce the total impedance (RS) loss, and improve the magnetic field shape through structural design improvements, so as to increase the charging distance and range of the charging end (Transmitter-TX) and the receiving end (Receiver-RX) to achieve a wireless charging device with higher performance, lower temperature rise, increased reliability, safety, and convenience has become one of the important issues that this industry wants to solve. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, one of the technical solutions adopted by the utility model is to provide a wireless charging coil module, which includes: a base, having a first surrounding recess and a second surrounding recess surrounding the first surrounding recess; a sensor coil, arranged in the first surrounding recess; and a magnet, arranged in the second surrounding recess; wherein the base is formed by integrally forming ferrite.

[0006] Furthermore, the sensing coil is arranged in the first surrounding recess via adhesive.

[0007] Furthermore, the adhesive backing is ADH, glue or sponge.

[0008] Furthermore, the sensor coil is a multi-strand sensor coil.

[0009] Furthermore, the wireless charging coil module further includes a sponge, and the sponge is arranged between the second surrounding recess and the magnet.

[0010] Furthermore, the sponge can include ADH and a thermal conductive sheet.

[0011] Furthermore, the Q value of the wireless charging coil module is greater than 140.

[0012] Furthermore, the total impedance of the wireless charging coil module is less than 150 mΩ.

[0013] Furthermore, the width of the first surrounding recess is greater than the width of the second surrounding recess.

[0014] Furthermore, a depth of the first surrounding-shaped recessed portion is smaller than a depth of the second surrounding-shaped recessed portion.

[0015] One of the beneficial effects of the present invention is that the wireless charging coil module provided by the present invention can effectively reduce RS, improve the Q value of the wireless charging device, and change the magnetic field pattern through the technical solutions of "a base having a first surrounding recess and a second surrounding recess surrounding the first surrounding recess" and "the base is formed of ferrite in one piece", so as to increase the charging distance and range, thereby improving the charging efficiency, and being compatible with the charging conditions of WPC Version2.0 (MPP).

[0016] In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional exploded view of the wireless charging coil module of the present utility model.

[0018] Figure 2 It is a three-dimensional exploded view of the wireless charging coil module of the present utility model.

[0019] Figure 3 It is a top view schematic diagram of the wireless charging coil module of the present invention.

[0020] Figure 4 It is a three-dimensional schematic diagram of the wireless charging coil module of the present utility model.

[0021] Figure 5 It is a bottom-up stereoscopic schematic diagram of the wireless charging coil module of the present invention.

[0022] Figure 6 The wireless charging coil module of the utility model is Figure 4 Cross-sectional view of section VI-VI.

[0023] Figure 7 for Figure 6 Exploded cross-section diagram.

[0024] Figure numerals: 10: base; 11: first surrounding recess; 12: second surrounding recess; 20: sensing coil; 30: magnet; 40: adhesive backing; 50: sponge. DETAILED DESCRIPTION

[0025] The following is an explanation of the implementation of the "wireless charging coil module" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following implementation methods will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0026] It should be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

[0027] See also Figures 1 to 7 As shown, Figures 1 to 5 They are respectively a stereoscopic exploded view, a top view schematic diagram, a stereoscopic schematic diagram, and a bottom view stereoscopic schematic diagram of the wireless charging coil module of the present invention. Figure 6 The wireless charging coil module of the utility model is Figure 4 The cross-sectional view of section VI-VI of Figure 7 for Figure 6 The utility model provides a wireless charging coil module, which is implemented in the form of MI (magnetic sensing) WPC Version 2.0 (MPP) wireless charging coil Transmitter (TX).

[0028] Specifically, the wireless charging coil module of the present invention includes: a base 10, a sensor coil 20 and a magnet 30. The base 10 of the present invention is formed of ferrite in one piece and has a first surrounding recess 11 and a second surrounding recess 12 surrounding the first surrounding recess 11. In one embodiment of the present invention, the first surrounding recess 11 and the second surrounding recess 12 may be annular. In addition, the bottom of the base 10 may have a through hole for the sensor coil 20 to pass through.

[0029] Furthermore, the sensing coil 20 of the utility model is disposed in the first surrounding recess 11, and the magnet 30 is disposed in the second surrounding recess 12. Specifically, the first surrounding recess 11 has a first accommodation space to dispose the sensing coil 20 in the first accommodation space. The second surrounding recess 12 has a second accommodation space to dispose the magnet 30 in the second accommodation space. In other words, the sensing coil 20 and the magnet 30 are disposed in the base 10 in a surrounding shielding manner, which can improve the magnetic field shape, increase the Q value and reduce the total impedance (RS) loss.

[0030] In one embodiment of the present invention, the outer edge of the sensing coil 20 does not contact the side wall of the first accommodation space. In other words, there is a first predetermined distance between the outer edge of the sensing coil 20 and the side wall of the first accommodation space, and the first predetermined distance is between 0.125mm and 2.625mm under different coil strands and conditions. Similarly, the outer edge of the magnet 30 does not contact the side wall of the second accommodation space. In other words, there is a second predetermined distance between the outer edge of the magnet 30 and the side wall of the second accommodation space, and the second predetermined distance is between 0.265mm and 0.635mm.

[0031] It is worth mentioning that the existing WPC (Mi) MPP ferrite components are designed in a flat (without retaining wall) style. Although they meet the WPC wireless charging standard specifications and certification capabilities, their low Q value and high RS value conditions will limit the charging speed, charging efficiency, charging distance, product temperature rise and other issues and put them at a disadvantage. The ferrite of the present invention is integrated and the coil and magnet are isolated by a retaining wall to improve the Q value of the wireless charging device, reduce the total impedance (RS) loss, and improve the magnetic field shape, thereby improving the charging speed, charging efficiency, charging distance, product temperature rise and other issues. In one embodiment of the present invention, the number of turns of the coil can be 10TS to 11TS. In one embodiment of the present invention, the thickness of the sensor coil 20 can be 0.86mm to 1.0mm.

[0032] In addition, the width of the sensor coil 20 may be 24.5 mm to 29.5 mm, and in order to arrange the sensor coil 20 more stably, the sensor coil 20 may be arranged in the first surrounding recess 11 via the adhesive backing 40. Accordingly, the sensor coil 20 can be fixed in the first accommodation space. The width of the adhesive backing 40 may correspond to the width of the sensor coil 20. However, as long as the width of the sensor coil 20 can be fixed in the first accommodation space, the width of the adhesive backing 40 may also be smaller than the width of the sensor coil 20. For example, the adhesive backing 40 may be ADH (Adipic dihydrazide), glue or sponge. The thickness of the adhesive backing 40 may be 0.25 mm to 0.39 mm. However, the utility model is not limited to the above examples.

[0033] In one embodiment of the utility model, the magnet 30 may be composed of a plurality of magnetic elements. For example, the magnet 30 of the utility model may be composed of 8 magnetic elements. However, the utility model is not limited to the above examples. In addition, the width of the magnet 30 may be increased or decreased according to the structure of the utility model, and is defined as 3.94mm to 4.06mm according to the sample number sent this time. The thickness of the magnet 30 may be increased or decreased according to the structure of the utility model, and is defined as 1.8mm to 2.7mm according to the sample number sent this time. The wireless charging coil module of the utility model may also include a sponge 50 disposed between the second surrounding recess 12 and the magnet 30, and the width of the sponge 50 may be 3.94mm to 4.06mm. The thickness of the sponge 50 may be 0.5mm to 1.4mm. Further, the sponge 50 may include ADH and a thermal pad.

[0034] In one embodiment of the present invention, the width of the first surrounding recess 11 is greater than the width of the second surrounding recess 12. In another embodiment of the present invention, the depth of the first surrounding recess 11 is less than the depth of the second surrounding recess 12. Specifically, the width of the first surrounding recess 11 can be increased or decreased according to the structure of the present invention, and is defined as 10.52mm to 10.78mm according to the material number of this sample delivery, and the width of the second surrounding recess 12 can be increased or decreased according to the structure of the present invention, and is defined as 5.05mm to 5.33mm according to the material number of this sample delivery. The depth of the first surrounding recess 11 can be increased or decreased according to the structure of the present invention, and is defined as 1.05mm to 1.45mm according to the material number of this sample delivery, and the depth of the second surrounding recess 12 can be increased or decreased according to the structure of the present invention, and is defined as 2.95mm to 3.45mm according to the material number of this sample delivery.

[0035] When manufacturing the wireless charging coil module of the utility model, simulation software can be used to evaluate whether different mechanisms, coupling sensing areas, thicknesses, inner diameters (di), outer diameters (do), charging distances, structures, numbers of turns, numbers of winding layers, etc. can achieve the required electrical characteristics and dimensions, and then the wireless charging coil module and the wireless charging electrical module can be manufactured according to the simulated parameter values.

[0036] The effectiveness of the wireless charging coil module of the present invention was tested. The following Table 1 shows the L, Rdc, RS and Q values ​​tested under the condition of @1V / 360KHZ, where L is the inductance; Rdc is the DC resistance; RS is the total resistance; and Q is the quality, which is used to judge the better performance of the wireless charging coil.

[0037] In the following table, the embodiment is a wireless charging coil module using the present invention, which has a base 10, a sensor coil 20, a magnet 30, a back glue 40 and a sponge 50 formed by ferrite. Comparative Example 1 uses a wireless charging coil module including a magnet, a ferrite and a coil, and a sponge is arranged under the magnet, and the coil is arranged on the ferrite via adhesive. Comparative Example 2 uses a wireless charging coil module including a magnet, a ferrite, a lower cover and a coil, and the coil is arranged on the ferrite via adhesive, and the ferrite and the magnet are arranged on the lower cover via adhesive.

[0038] Table 1

[0039]

[0040]

[0041] Q = wL / R = 1 / wRC, where Q is the quality factor; w is the power supply frequency when the circuit resonates; L is the inductance; R is the series resistance; and C is the capacitance.

[0042] From the data in Table 1, it can be seen that the wireless charging coil module of the present invention includes a base 10 formed of ferrite in one piece, which can reduce magnetic field dispersion, improve the magnetic field shape, reduce RS loss and increase the Q value, thereby increasing the charging distance and range between the charging end and the receiving end, and increasing the reliability, convenience, safety, high performance and low temperature rise of the wireless charging coil module.

[0043] In addition, when using the iPhone 15 as the receiving end, the outermost edge of the mechanism consisting of the magnet and the transmitting end is between 1 and 4 mm. The charging time from 20% to 100% of the power can be saved by an average of about 8%. Under the 4mm condition, the charging time from 20% to 100% of the power can be saved by about 15%.

[0044] Advantageous Effects of Embodiments

[0045] One of the beneficial effects of the present invention is that the wireless charging coil module provided by the present invention can effectively reduce RS, improve the Q value of the wireless charging device, and change the magnetic field pattern through the technical solutions of "a base having a first surrounding recess and a second surrounding recess surrounding the first surrounding recess" and "the base is formed of ferrite in one piece", so as to improve the charging speed, charging efficiency, charging distance, product temperature rise and other issues, and can be compatible with the charging conditions of WPC Version 2.0 (MPP).

[0046] Furthermore, since the wireless charging coil module of the utility model has a wider charging range and distance, it can meet the requirements of automotive and commercial applications within a higher effective area of ​​the structure. The structure thickness of the product (the distance between the coil and the outer edge of the product structure) is increased and is compatible with Qi MPP 2.0 wireless charging.

[0047] The contents disclosed above are only preferred feasible embodiments of the present utility model, and are not intended to limit the protection scope of the claims of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the protection scope of the claims of the present utility model.

Claims

1. A wireless charging coil module, characterized in that: The wireless charging coil module comprises: A base having a first surrounding recess and a second surrounding recess surrounding the first surrounding recess; A sensing coil is disposed in the first surrounding recess; and A magnet is disposed in the second surrounding recess; Wherein, the base is formed by integrally molding ferrite.

2. The wireless charging coil module according to claim 1, characterized in that: The sensing coil is arranged in the first surrounding recess via adhesive.

3. The wireless charging coil module according to claim 2, characterized in that: The back adhesive is adipic acid dihydrazide, glue or sponge.

4. The wireless charging coil module according to claim 1, characterized in that: The sensor coil is a multi-strand sensor coil.

5. The wireless charging coil module according to claim 1, characterized in that: The wireless charging coil module further includes a sponge, which is disposed between the second surrounding recess and the magnet.

6. The wireless charging coil module according to claim 5, characterized in that: The sponge can include adipic acid dihydrazide and a thermal conductive pad.

7. The wireless charging coil module according to claim 1, characterized in that: The Q value of the wireless charging coil module is greater than 140.

8. The wireless charging coil module according to claim 1, characterized in that: The total impedance of the wireless charging coil module is less than 150mΩ.

9. The wireless charging coil module according to claim 1, characterized in that: The width of the first surrounding recess is greater than the width of the second surrounding recess.

10. The wireless charging coil module according to claim 1, characterized in that: The depth of the first surrounding-shaped recess is smaller than the depth of the second surrounding-shaped recess.

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