Structure of coils for a wireless charger

Abstract

A structure of coils for a wireless charger comprises a plurality of coils, wherein the plurality of coils are stacked into a plurality of layers of coils with each layer comprising at least two coils, wherein at least two electronic devices are capable of being placed over the plurality of coils for charging the at least two electronic devices.

Claims

1. A structure of coils for a wireless charger, wherein said structure of coils comprises a plurality of coils, wherein the plurality of coils are stacked into a plurality of layers with each layer comprising at least two coils, wherein at least two electronic devices are capable of being placed over the plurality of coils for charging the at least two electronic devices.

2. The structure of coils of claim 1, wherein said two electronic devices are placed over the plurality of coils in a horizontal direction for charging the at least two electronic devices.

3. The structure of coils of claim 1, wherein said two electronic devices are placed over the plurality of coils in a vertical direction for charging the at least two electronic devices.

4. The structure of coils of claim 1, wherein the plurality of coils are stacked into three layers for charging the at least two electronic devices.

5. The structure of coils of claim 1, wherein the plurality of coils are stacked into three layers with each layer comprising at least two coils for charging the at least two electronic devices.

6. The structure of coils of claim 1, wherein the plurality of coils comprises eighteen coils stacked into three layers, wherein a bottom layer comprises seven coils, a middle layer comprises four coils, and a top layer comprises seven coils.

7. The structure of coils of claim 1, wherein the plurality of coils care stacked into two layers, wherein a bottom layer comprises four coils and a top layer comprises five coils.

8. The structure of coils of claim 1, wherein each of said two electronic devices is a mobile phone.

9. The structure of coils of claim 1, wherein a magnetic material encapsulates the plurality of coils.

10. A structure of coils for a wireless charger, wherein said structure of coils comprises a plurality of coils, wherein the plurality of coils are stacked into a plurality of layers with each layer comprising at least two coils, wherein an electronic device is capable of being placed over the plurality of coils in at least three different orientations for charging the electronic device.

11. The structure of coils of claim 10, wherein a magnetic material encapsulates the plurality of coils.

12. The structure of coils of claim 10, wherein an electronic device is capable of placed over the plurality of coils in a horizontal, a vertical or a diagonal direction for charging said electronic device.

13. The structure of coils of claim 10, wherein said electronic device is a mobile phone.

14. An electronic device, comprising: a metallic housing unit, comprising a metallic plate, wherein a first recess is formed on a top side of the metallic housing unit and a second recess is formed on a bottom side of the metallic housing unit, wherein the first recess and the second recess are on two opposite sides of the metallic plate; at least one conductive element, disposed in the first recess; and a circuit board, disposed in the second recess and electrically conned to the at least one conductive element.

15. The electronic device of claim 14, wherein the electronic device is a wireless charger, wherein the at least one conductive element comprises a plurality of coils, wherein the plurality of coils are stacked into a plurality of layers for charging at least one electronic device.

16. The electronic device of claim 14, wherein the circuit board has a through-opening, wherein a first part of a fan is disposed in the through-opening and a second part of the fan is disposed below the circuit board.

17. The electronic device of claim 14, wherein an EMI filter is disposed over the plurality of coils.

18. The electronic device of claim 14, wherein the metallic plate comprises AlSiCu alloy.

19. The electronic device of claim 14, wherein the at least one conductive element comprises a plurality of coils, wherein a magnetic material encapsulates the plurality of coils, and an upper cover is disposed over the magnetic material, wherein each of a bottom surface of the upper cover and a top surface of the plurality of coils is in contact with the magnetic material.

20. The electronic device of claim 14, wherein the metallic housing unit comprises an aluminum or an aluminum alloy material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention can be more fully understood by reading the subsequent description and examples with references made to the accompanying drawings, wherein:

[0029] FIG. 1A is a top view of an structure of coils for a wireless charger in accordance with one embodiment of the invention;

[0030] FIG. 1B is a top view of an active zone generated by the charging coils in accordance with one embodiment of the invention;

[0031] FIG. 1C shows a placement of an electronic device over the charging coils in accordance with one embodiment of the invention;

[0032] FIG. 1D shows a placement of an electronic device over the charging coils in accordance with one embodiment of the invention;

[0033] FIG. 1E shows a placement of an electronic device over the charging coils in accordance with one embodiment of the invention;

[0034] FIG. 1F shows a placement of an electronic device over the charging coils in accordance with one embodiment of the invention;

[0035] FIG. 1G shows a placement of an electronic device over the charging coils in accordance with one embodiment of the invention;

[0036] FIG. 1H shows a placement of a receiving coil of an electronic device over the charging coils in accordance with one embodiment of the invention;

[0037] FIG. 2A shows a bottom layer with four coils in accordance with one embodiment of the invention;

[0038] FIG. 2B shows an upper layer with five coils in accordance with one embodiment of the invention;

[0039] FIG. 3A is a prospective view of a wireless charger in accordance with one embodiment of the invention;

[0040] FIG. 3B is an exploded view from the top of a wireless charger in accordance with one embodiment of the invention;

[0041] FIG. 3C is an exploded view from the bottom of a wireless charger in accordance with one embodiment of the invention;

[0042] FIG. 3D shows the airflows in the wireless charger caused by a fan in accordance with one embodiment of the invention; and

[0043] FIG. 3E shows the airflows at a side surface of the wireless charger in accordance with one embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0044] It is understood that the following disclosure provides many different embodiments, or examples, for implementing different features of the invention. Specific examples of devices and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features such that the first and second features are not in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

[0045] The present invention discloses a wireless charger with multiple coils stacked into layers for charging electronic devices, wherein the layers of coils forms an active zone of fluxes for charging electronic devices.

[0046] The placement of electronic devices over the multiple coils need not to be fixed in a special direction or a special alignment for convenience of users.

[0047] FIG. 1A is a top view of an structure of coils for a wireless charger 101 in accordance with one embodiment of the invention, wherein the structure of coils comprises a plurality of coils, wherein the plurality of coils are stacked into a plurality of layers 102, 103, 104 with each layer comprising at least two coils. Please refer to FIG. 1C, FIG. 1D, FIG. 1E and FIG. 1F, wherein at least two electronic devices 200, 201 are capable of being placed over the plurality of layers 102, 103, 104 of coils for charging the at least two electronic devices 200, 201.

[0048] As shown in FIG. 1B, the plurality of layers 102, 103, 104 of coils forms an active zone 105 of fluxes for charging electronic devices. Please refer to FIG. 1C, FIG. 1D, FIG. 1E and FIG. 1F, the receiving coils 200a, 201a of the electronic devices 200, 201 can be placed in the active zone 105 for charging through coupling induction between the transmitting coils of the plurality of layers 102, 103, 104 and the receiving coils 200a, 201a of the electronic devices 200, 201 without restrictions on the placement orientation of the electronic device 200, 201.

[0049] In one embodiment, please refer to FIG. 1C, FIG. 1D, FIG. 1E and FIG. 1F, two electronic devices 200, 201 are capable of being placed over the plurality of layers 102, 103, 104 of coils in at least two different orientations for charging the at least two electronic devices. For example, the electronic device 200 can be placed in a vertical direction as shown in FIG. 1C or a horizontal direction as shown in FIG. 1D; and the electronic device 201 can be placed in a vertical direction as shown in FIG. 1E, or a horizontal direction as shown in FIG. 1F.

[0050] In one embodiment, an electronic device is capable of being placed over the coils in at least three different orientations for charging the at least two electronic devices.

[0051] In one embodiment, an electronic device is capable of being placed over the coils in a horizontal, a vertical or a diagonal direction for charging the at least two electronic devices.

[0052] As shown in FIG. 1G, the electronic device can be placed in a diagonal direction.

[0053] In one embodiment, the electronic device is a mobile phone.

[0054] In one embodiment, the plurality of coils are stacked into three layers with each layer comprising at least four coils.

[0055] In one embodiment, the plurality of coils are capable of being divided into two groups with each group comprising multiple coils.

[0056] In one embodiment, the plurality of coils are capable of being divided into two groups with each group comprising nine coils.

[0057] In one embodiment, the plurality of coils comprises eighteen coils stacked into three layers, wherein a bottom layer comprises seven coils, a middle layer comprises four coils, and a top layer comprises seven coils.

[0058] In one embodiment, each of the electronic devices 200, 201 is a mobile phone.

[0059] In one embodiment, as shown in FIG. 1H, when the receiving coil 200a of the electronic device 200 is located between three coils 102a, 103a, 104a of the plurality of layers 102, 103, 104 of coils, a coil of the three coils 102a, 103a, 104a will be selected for charging the electronic device 200 after determining the selected transmitting coil has a higher K coupling with the receiving coil 200a of the electronic device 200. In one embodiment, the top coil 102a of the three coils 102a, 103a, 104a will be selected, because the distance between the top coil 102a and the receiving coil 200a of the electronic device 200 is the shortest and hence has a better coupling coefficient.

[0060] In one embodiment, the wireless charger 101 comprises at least one processor or micro-controller to select the transmitting coil that has a higher K coupling with the receiving coil 200a of the electronic device 200.

[0061] In one embodiment, as shown in FIG. 2A and FIG. 2B, the plurality of coils comprises are stacked into two layers, wherein a bottom layer comprises four coils and a top layer comprises five coils.

[0062] In one embodiment, as shown in FIG. 2A, the four coils of the bottom layer are placed in the four spaces formed by two diagonal lines D1, D2, and the five coils of the top layer are placed on the two diagonal lines D1, D2, as shown in FIG. 2B, such that three coils are passed by in each horizontal direction or vertical direction 1, 2, 3 or each diagonal line D1, D2.

[0063] FIG. 3A is a prospective view of the wireless charger 101, FIG. 3B an exploded view from the top side of the wireless charger 101 and FIG. 3C is an exploded view from the bottom side of the wireless charger 101 in accordance with one embodiment of the invention.

[0064] Please refer to FIG. 3A-3C, wherein the wireless charger 101 comprises: a metallic housing unit 354, comprising a metallic plate 354a, a first recess 354b is formed on a top side of the metallic housing unit 354 and a second recess 354c is formed on a bottom side of the metallic housing unit 354, wherein the first recess 354b and the second recess 354c are on two opposite sides of the metallic plate 354a; at least one conductive element, such as coils 353, disposed in the first recess 354b; and a circuit board 357 disposed in the second recess 354c and electrically conned to at least one conductive element, such as coils 353.

[0065] In one embodiment, the at least one conductive element comprises a plurality of coils 353, wherein the plurality of coils 353 are stacked into a plurality of layers for charging at least one electronic device, and the plurality of coils are disposed in the first recess 354b.

[0066] In one embodiment, the circuit board 357 has a through-opening 356a, wherein at least one part of the fan 356 is disposed in the through-opening 356a.

[0067] In one embodiment, the fan 356 is located at a corner of the metallic housing unit 354, wherein the fan 356 causes the airflow from a first side 354d of the metallic housing unit 354 into a second side 354e of the metallic housing unit 354, wherein the first side 354d and the second side 354e are two adjacent sides of the metallic housing unit 354.

[0068] Please refer to FIG. 3D, wherein at least one part of the fan 356 is disposed below the circuit board 357, wherein the fan 356 causes the airflows 310a, 310b into the openings 310g, 310h, 310m, 310n at a first side 354d of the wireless charger 101 into a second side 354e of the wireless charger 101, wherein the first side 354d and the second side 354e are two adjacent sides of the wireless charger 101, wherein the openings 310g, 310m can form airflow paths above the circuit board 357 and the openings 310h, 310n can form airflow paths below the circuit board 357.

[0069] Please refer to FIG. 3E, which shows the side view of the airflow at the second side 354e. The fan 356 causes the airflow 301c enter into the second side 354e and the airflow 301d leaves the second side 354e. By doing do, the heat generated by the wireless charger 101 can be dissipated in multiple paths, one path is above the circuit board 357 and another path is below the circuit board 357, so as to lower the temperature of the wireless charger 101 more effectively.

[0070] In one embodiment, at least one heat sink extends along the metallic housing unit 354 in a direction of the airflow.

[0071] In one embodiment, an EMI filter 352 is disposed over the plurality of coils 353.

[0072] In one embodiment, an upper cover 351, which can be a plastic cover, is disposed over the EMI filter 352.

[0073] In one embodiment, a lower cover 358, which can be a metal cover, is disposed over the bottom surface of the circuit board 357, wherein the upper cover 351 and the lower cover 358 are at two opposite sides of the metallic plate 354a.

[0074] In one embodiment, the plurality of coils 353 are stacked into a plurality of layers with each layer comprising at least two coils, wherein at least two electronic devices are capable of being placed over the plurality of coils in at least two different orientations for charging the at least two electronic devices.

[0075] In one embodiment, the plurality of coils 353 comprises eighteen coils stacked into three layers, wherein a bottom layer comprises seven coils, a middle layer comprises four coils, and a top layer comprises seven coils.

[0076] In one embodiment, the metallic plate 354a comprises ADC12, that is, the metallic plate 354a can have a strong mechanical strength to withstand the stress when the wireless charger 101 is under pressure, wherein the ADC12 comprises AlSiCu alloy.

[0077] In one embodiment, the metallic housing unit 354 comprising aluminum or aluminum alloy material.

[0078] In one embodiment, a plurality of fins are located at the inner or outer surface of the metallic housing unit 354, and the plurality of fins extending along the metallic housing unit 354 in a direction of the airflow caused by the fan 356.

[0079] In one embodiment, the surface of the plurality of fins may be roughened.

[0080] In one embodiment, the air inlet is substantially parallel to the air outlet, and the wireless charger may be configured with a filter for filtering the air form the air inlet. In one embodiment, the filter can be made of a hydrophobic material.

[0081] In one embodiment, the wireless charger 101 further includes a fan speed control, which can adjust the fan rotation based on the temperature of the wireless charger 101 or the electronic devices 200, 201.

[0082] In one embodiment, a magnetic material is used to encapsulate the coils, wherein the magnetic material can be metal or alloy magnetic material or ferrite magnetic material. The ferrite magnetic material can be polycrystalline, single crystal or amorphous.

[0083] In one embodiment, the surface of the metallic housing unit 354 is sealed with the coils 353 by the ferrite magnetic material.

[0084] In one embodiment, the metallic housing unit 354 is sealed with the upper cover 351 and the lower cover 358 by the ferrite magnetic material.

[0085] In one embodiment, each of the bottom surface of the upper cover 351 and the coils 353 can be in contact with the ferrite magnetic material for transferring the stress, wherein the upper cover 351, the coils 353, and the ferrite magnetic material are supported by the metallic plate 354a of the metallic housing unit 354.

[0086] From the foregoing, it will be appreciated that, although specific embodiments have been described herein for purposes of illustration, various modifications can be made without deviating from the spirit and scope of the disclosure. Furthermore, where an alternative is disclosed for a particular embodiment, this alternative may also apply to other embodiments even if not specifically stated.