Wireless charging board and wireless charging device

1. A wireless charging board comprising:

a shielding layer;

a coil pattern disposed on one surface of the shielding layer;

an adhesive layer interposed between the shielding layer and the coil pattern; and

a magnetic pattern disposed on the adhesive layer and entirely within a space of a central part of the coil pattern,

wherein the magnetic pattern is disposed on the same plane as the coil pattern,

wherein a thickness of the magnetic pattern is equal to or less than a thickness of the coil pattern,

wherein a relative permeability of the magnetic pattern is 10 to 100000,

wherein a relative permeability of the shielding layer is 10 to 1000, and

wherein a magnetic flux density of the magnetic pattern is 0.4 to 2.5 Tesla (T).

2. The wireless charging board of claim 1 , wherein an area of the magnetic pattern is 2% to 40% of an area of the one surface of the shielding layer.

3. The wireless charging board of claim 1 , wherein a width of the magnetic pattern is 0.9 to 1.5 mm.

4. The wireless charging board of claim 1 , wherein the magnetic pattern is formed of iron (Fe)-based non-directional electrical steel, Fe-based directional electrical steel, or stainless steel.

5. The wireless charging board of claim 1 , wherein a thickness of the shielding layer is 1 to 600 μm.

6. The wireless charging board of claim 1 , wherein the shielding layer comprises an Fe-based magnetic material.

7. The wireless charging board of claim 1 , wherein an interface between the coil pattern and the shielding layer is free of magnetic material.

8. The wireless charging board of claim 1 , wherein an uppermost surface of the magnetic pattern does not extend past an uppermost surface of the coil pattern.

9. The wireless charging board of claim 1 , wherein the magnetic pattern and an innermost coil winding of the coil pattern both have a rectangular shape.

10. The wireless charging board of claim 1 , wherein an outermost coil winding of the coil pattern has a rounded rectangle shape.

11. The wireless charging board of claim 1 , wherein the magnetic pattern is provided such that a voltage difference detected by a hall sensor of a charge inducing board is equal to or greater than a predetermined voltage, and

wherein the voltage difference being a difference in voltages when the wireless charging board is located in an area which the charge inducing board can reach electrically, and when the wireless charging board is not located in an area which the charge inducing board can reach electrically, respectively.

12. The wireless charging board of claim 11 , wherein a change in the voltage difference detected by the hall sensor based on a distance between the wireless charging board and the charge inducing board is equal to or greater than a predetermined voltage of 120 mV.

13. The wireless charging board of claim 11 , wherein a change in a voltage difference detected by the hall sensor based on a distance between the wireless charging board and the charge inducing board is equal to or less than 200 mV.