Coil for cordless charging and cordless charging apparatus using the same

• US 9,355,766 B2
• Filed: 03/11/2013
• Issued: 05/31/2016
• Est. Priority Date: 12/28/2012
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Han, Chang Mok, Nam, Hyeon Gil, Sung, Jae Suk, Cho, Hyung Wook, Chang, Ki Won, Park, Sung Heum, Cho, Sung Eun, Jeon, Dae Seong
• Primary Examiner(s): Williams, Arun
• Application Number:
  US13/793,651
• Publication Number:
  US 20140184151A1
• Time in Patent Office: 1,177 Days
• Field of Search: 320/108
• US Class Current: 1/1
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 5/00 Coils superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00
• CPC Class Codes: H01F 5/04 Arrangements of electric connections to coils, e.g. leads
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

There are provided a coil for cordless charging, which may be formed as a thin coil in spite of the presence of a plurality of coils included therein, and a cordless charging apparatus using the same. The cordless charging apparatus includes: a coil unit including coil substrates having a coil pattern and a connection substrate having one end interposed between the coil substrates and electrically connected to the coil pattern and the other end electrically connected to the outside; and a case accommodating the coil unit therein.

Claims

1. A coil for cordless charging, the coil comprising:

first and second coil substrates having a coil pattern; and

a connection substrate having one end interposed between the first and second coil substrates and electrically connected to the coil pattern and the other end electrically connected to the outside,

wherein each of the first coil substrate and the second coil substrate is printed on a printed circuit board having rigidity, and the connection substrate is a thin film circuit board having flexibility.

2. The coil of claim 1, wherein the coil pattern comprises coil strands formed on both surfaces of the respective coil substrates, and the coil strands are connected in parallel.

3. The coil of claim 1, wherein the coil pattern comprises a plurality of coil strands formed on the coil substrates, and the plurality of coil strands are uniformly or equally distributed based on the center of the connection substrate.

4. The coil of claim 1, wherein the connection substrate does not have a coil pattern.

5. A cordless charging apparatus comprising:

a coil unit comprising first and second coil substrates having a coil pattern and a connection substrate having one end interposed between the first and second coil substrates and electrically connected to the coil pattern and the other end electrically connected to the outside; and

a case accommodating the coil unit therein,

wherein each of the first coil substrate and the second coil substrate is printed on a printed circuit board having rigidity, and the connection substrate is a thin film circuit board having flexibility.

6. The cordless charging apparatus of claim 5, wherein the coil pattern is formed by disposing a plurality of coil strands in line abreast within the coil substrates.

7. The cordless charging apparatus of claim 5, wherein the coil unit comprises the coil pattern formed on at least one of both surfaces of the coil substrate, and a contact pad is formed at both ends of the coil pattern and electrically connected to the connection substrate.

8. The cordless charging apparatus of claim 7, wherein the connection substrate comprises a connection pad formed in a position corresponding to the contact pad and electrically connected to the contact pad.

9. The cordless charging apparatus of claim 5, wherein the coil pattern comprises coil strands formed to have the same shape on both surfaces of the respective coil substrates.

10. The cordless charging apparatus of claim 9, wherein the coil substrates comprise conductive vias formed at positions at which ends of the coil pattern are disposed, and the coil strands formed on both surfaces of the respective coil substrates are electrically connected by the conductive vias.

11. The cordless charging apparatus of claim 5, wherein the coil pattern comprises coil strands formed on both surfaces of the respective coil substrates, and the coil strands are connected in parallel.

12. The cordless charging apparatus of claim 5, further comprising a magnetic unit attached to one surface of the coil unit to form a magnetic path.

13. The cordless charging apparatus of claim 12, wherein the magnetic unit is formed to have a flat plate-like shape, and comprises at least any one of a ferrite sheet, a metal composite sheet, and an amorphous sheet.

14. The cordless charging apparatus of claim 13, further comprising an adhesive unit interposed between the magnetic unit and the coil unit and attaching the magnetic unit and the coil unit.

15. The cordless charging apparatus of claim 5, further comprising a voltage conversion unit converting AC power supplied from the outside to an AC voltage having a particular frequency, and providing the converted AC voltage to the coil unit.

16. The cordless charging apparatus of claim 5, wherein the connection substrate does not have a coil pattern.