Wireless charging device for charging a plurality of wireless power receiving apparatus and charging method thereof

• US 9,793,743 B2
• Filed: 07/14/2015
• Issued: 10/17/2017
• Est. Priority Date: 07/14/2015
• Status: Active Grant

• Current Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Original Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Inventors: Chien, Feng-Lung, Chen, Mao-Chun, Lin, Chien-Hung, Hsu, Sheng-Tai, Lai, Ni-Ni, Hsu, Hsiang-Huims
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US14/799,077
• Publication Number:
  US 20170018947A1
• Time in Patent Office: 826 Days
• Field of Search: 320107, 320108, 320114, 320115, 307104
• CPC Class Codes: H01F 27/02 Casings
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless charging device includes a transmitting-end ferrite core and a transmitting-end coil, wherein the transmitting-end ferrite core have a bottom plate and two upright plates for forming a U-shaped structure defining a charging space therein. One or more wireless power receiving apparatus is put in the charging space. The wireless power receiving apparatus includes a receiving-end coil and a receiving-end ferrite plate, wherein the receiving-end ferrite plate is vertical to the two upright plates. When electrical current flows through the transmitting-end coil to generate an electromagnetic field in the charging space, the electromagnetic field via the two upright plates goes through each of the receiving-end ferrite plates to form an electromagnetic loop. Each of the receiving-end coils generates a charging electrical current induced by the electromagnetic field. Therefore, the present invention can achieve wireless charging to more than one wireless power receiving apparatus at the same time.

Claims

1. A wireless charging device capable of wireless charging a plurality of wireless power receiving apparatus, the wireless charging device comprising:

at least one transmitting-end ferrite core comprising a bottom plate and two upright plates to form a U-shaped structure, the transmitting-end ferrite core defining a charging space therein to accommodate the plurality of wireless power receiving apparatus,

wherein the wireless charging device has a plurality of transmitting-end ferrite cores including at least one inner transmitting-end ferrite core and an outer transmitting-end ferrite core, the inner transmitting-end ferrite core is stacked on the outer transmitting-end ferrite core, the inner transmitting-end ferrite core has two upright plates and the outer transmitting-end ferrite core has two upright plates longer than the upright plates of the inner transmitting-end ferrite core; and

at least one transmitting-end coil,

wherein each of the wireless power receiving apparatus has a receiving-end coil and a receiving-end ferrite plate and the plurality of wireless power receiving apparatus are arranged in the charging space vertical to the upright plates of the transmitting-end ferrite core;

when electrical current flows through the transmitting-end coil to generate an electromagnetic field in the charging space, the electromagnetic field via the two upright plates goes through each of the receiving-end ferrite plates to form an electromagnetic loop, whereby each of the receiving-end coils generates a charging electrical current induced by the electromagnetic field.

2. The wireless charging device in claim 1, wherein the transmitting-end coil comprises at least one concentric spiral planar coil wound on an inner face of the bottom plate and/or at least one the upright plates.

3. The wireless charging device in claim 1, wherein the wireless power receiving apparatus is arranged in the charging space and parallel to the bottom plate.

4. The wireless charging device in claim 1, wherein the wireless power receiving apparatus is arranged in the charging space and vertical to the bottom plate.

5. The wireless charging device in claim 4, wherein the wireless power receiving apparatus has a longer side and a shorter side and the wireless power receiving apparatus is arranged in the charging space with the longer side vertical to the bottom plate.

6. The wireless charging device in claim 4, wherein the wireless power receiving apparatus has a longer side and a shorter side and the wireless power receiving apparatus is arranged in the charging space with the shorter side vertical to the bottom plate.

7. The wireless charging device in claim 1, wherein the wireless power receiving apparatus is arranged in the charging space and non-parallel or non-vertical or slanting to the bottom plate.

8. The wireless charging device in claim 1, wherein the upright plates of the outer transmitting-end ferrite core are bent inward to form L shaped cross section.

9. The wireless charging device in claim 1, wherein the wireless charging device has a plurality of transmitting-end ferrite coils and each of the transmitting-end ferrite coils is corresponding to one transmitting-end ferrite core.

10. The wireless charging device in claim 1, further comprising a charging stage made of non-metal material and being of box shape with one opened side, the charging stage having a bottom part and two sidewalls, the bottom plate and the upright plates of the transmitting-end ferrite core are respectively arranged on the bottom part and the sidewalls of the charging stage.

11. The wireless charging device in claim 10, wherein the charging stage has a plurality of parallel baffle plates to define a plurality of accommodating slots, each of the accommodating slot accommodates wireless power receiving apparatus.

12. The wireless charging device in claim 10, wherein each of the upright plates of the charging stage has a plurality of sliding grooves extended from the opened side to the bottom plate, the wireless power receiving apparatus is arranged into the charging space with lateral edges thereof fit into the sliding grooves.

13. The wireless charging device in claim 10, wherein bottom part of the charging stage has a plurality of parallel ridges to define a plurality of locking grooves on inner face of the bottom plate, the wireless power receiving apparatus is placed in the charging space with one side of the wireless power receiving apparatus embedded into the locking groove and the wireless power receiving apparatus is erected in the charging space.

14. A method for wireless charging, comprising:

providing at least one transmitting-end ferrite core and at least one transmitting-end coil, the transmitting-end ferrite core comprising a bottom plate and two upright plates to form a U-shaped structure, the transmitting-end ferrite core defining a charging space therein, wherein the wireless charging device has a plurality of transmitting-end ferrite cores including at least one inner transmitting-end ferrite core and an outer transmitting-end ferrite core, the inner transmitting-end ferrite core is stacked on the outer transmitting-end ferrite core, the inner transmitting-end ferrite core has two upright plates and the outer transmitting-end ferrite core has two upright plates longer than the upright plates of the inner transmitting-end ferrite core;

placing at least one wireless power receiving apparatus into the charging space, each of wireless power receiving apparatus having a receiving-end coil and a receiving-end ferrite plate, the receiving-end ferrite plate of the wireless power receiving apparatus being vertical to the upright plates of the transmitting-end ferrite; and

conducing electrical current flowing through the transmitting-end coil to generate an electromagnetic field in the charging space, the electromagnetic field via the two upright plates goes through each of the receiving-end ferrite plates to form an electromagnetic loop, whereby each of the receiving-end coils generates a charging electrical current induced by the electromagnetic field.

15. The method in claim 14, wherein the transmitting-end coil comprises at least one concentric spiral planar coil wound on an inner face of the bottom plate and/or at least one the upright plates.

16. The method in claim 14, wherein the wireless power receiving apparatus is arranged in the charging space and parallel to the bottom plate.

17. The method in claim 14, wherein the wireless power receiving apparatus is arranged in the charging space and vertical to the bottom plate.

18. The method in claim 17, wherein the wireless power receiving apparatus has a longer side and a shorter side and the wireless power receiving apparatus is arranged in the charging space with the longer side vertical to the bottom plate.

19. The method in claim 17, wherein the wireless power receiving apparatus has a longer side and a shorter side and the wireless power receiving apparatus is arranged in the charging space with the shorter side vertical to the bottom plate.

20. The method in claim 14, wherein the wireless power receiving apparatus is arranged in the charging space and non-parallel or non-vertical or slanting to the bottom plate.

21. The method in claim 14, wherein the upright plates of the outer transmitting-end ferrite core are bent inward to form L shaped cross section.

22. The method in claim 14, wherein the wireless charging device has a plurality of transmitting-end ferrite coils and each of the transmitting-end ferrite coils is corresponding to one transmitting-end ferrite core.

23. A wireless charging device capable of wireless charging a plurality of wireless power receiving apparatus, the wireless charging device comprising:

a transmitting-end ferrite core comprising a bottom plate and an upright plate surrounding the bottom plate to form a barrel-shaped structure with an opened side, the transmitting-end ferrite core defining a charging space therein to accommodate one or more wireless power receiving apparatus; and

a first transmitting-end coil arranged on an inner face of the upright plate;

wherein each of the wireless power receiving apparatus has a receiving-end coil and a receiving-end ferrite plate and the plurality of wireless power receiving apparatus are arranged in the charging space;

when electrical current flows through the first transmitting-end coil to generate an electromagnetic field in the charging space, each of the receiving-end coils generates a charging electrical current induced by the electromagnetic field.

24. The wireless charging device in 23, wherein the wireless power receiving apparatus is placed in arbitrary position in the charging space.

25. The wireless charging device in 23, further comprising a charging stage made of non-metal material and being of box shape with one opened side, the charging stage having a bottom part and two sidewalls, the bottom plate and the upright plates of the transmitting-end ferrite core are respectively arranged on the bottom part and the sidewalls of the charging stage.

26. The wireless charging device in 25, wherein the first transmitting-end coil is of rectangular box shape with one opened side and corresponding to the charging stage.

27. The wireless charging device in 25, wherein the first transmitting-end coil is of circular or elliptic box shape with one opened side and corresponding to the charging stage.

28. The wireless charging device in 23, further comprising:

a second transmitting-end coil arranged on the bottom plate, the second transmitting-end coil generating electromagnetic field in the charging space when electric current flows through the second transmitting-end coil, whereby the receiving-end coils generates a charging electrical current induced by the electromagnetic field of the second transmitting-end coil.

29. The wireless charging device in 28, wherein the bottom plate is a rectangular ferrite plate and the second transmitting-end coil is wound on an outer face of the bottom plate.

30. A method for wireless charging, comprising:

providing a transmitting-end ferrite core and a first transmitting-end coil, the transmitting-end ferrite core comprising a bottom plate and an upright plate surrounding the bottom plate to form a barrel-shaped structure with an opened side, the transmitting-end ferrite core defining a charging space therein, the first transmitting-end coil arranged on an inner face of the upright plate;

placing one or more wireless power receiving apparatus into the charging space, each of wireless power receiving apparatus having a receiving-end coil and a receiving-end ferrite plate; and

conducing electrical current to the first transmitting-end coil to generate an electromagnetic field in the charging space, each of the receiving-end coils generating a charging electrical current induced by the electromagnetic field.

31. The method in claim 30, wherein the wireless power receiving apparatus is placed in arbitrary position in the charging space.

32. The method in claim 30, wherein the first transmitting-end coil is of rectangular box shape with one opened side and corresponding to the charging stage.

33. The method in claim 30, wherein the first transmitting-end coil is of circular or elliptic box shape with one opened side and corresponding to the charging stage.

34. The method in claim 30, further comprising:

Providing a second transmitting-end coil arranged on the bottom plate; and

Conducting electric current to the second transmitting-end coil to generate electromagnetic field in the charging space, whereby the receiving-end coils generates a charging electrical current induced by the electromagnetic field of the second transmitting-end coil.

35. The method in claim 34, wherein the bottom plate is a rectangular ferrite plate and the second transmitting-end coil is wound on an outer face of the bottom plate.