Coil for cordless charging and cordless charging apparatus using the same
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.
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.