WIRELESS POWER TRANSMISSION MODULE AND ELECTRONIC DEVICE INCLUDING THE SAME
A wireless power transmission module includes a coil portion having a spiral form and including a hollow portion; and a magnetic portion including a coil accommodation portion in which the coil portion is disposed, the coil accommodation portion being formed as a hollow space in an upper surface of the magnetic portion, and having a bowl form having a greatest width at the upper surface of the magnetic portion; and a magnetic field concentration portion protruding upwardly from a central portion of the coil accommodation portion through the hollow portion of the coil portion.
1 . A wireless power transmission module comprising:
a coil portion having a spiral form and comprising a hollow portion; and
a magnetic portion comprising:
a coil accommodation portion in which the coil portion is disposed, the coil accommodation portion being formed as a hollow space in an upper surface of the magnetic portion, and having a bowl form having a greatest width at the upper surface of the magnetic portion; and
a magnetic field concentration portion protruding upwardly from a central portion of the coil accommodation portion through the hollow portion of the coil portion.
2 . The wireless power transmission module of claim 1 , wherein an end portion of the magnetic field concentration portion is coplanar with the upper surface of the magnetic portion.
3 . The wireless power transmission module of claim 1 , wherein at least a portion of the coil portion is disposed on an internal surface of the coil accommodation portion.
4 . The wireless power transmission module of claim 3 , wherein a portion of the coil portion is wound around at least a portion of an outer circumferential surface of the magnetic field concentration portion.
5 . The wireless power transmission module of claim 1 , wherein a cross-sectional area of the magnetic field concentration portion increases or decreases in a direction toward an end portion of the magnetic field concentration portion.
6 . The wireless power transmission module of claim 1 , wherein the magnetic portion comprises:
a base portion forming a bottom of the coil accommodation portion; and
a sidewall portion disposed along a perimeter of the base portion and forming an external side surface of the coil accommodation portion.
7 . The wireless power transmission module of claim 6 , wherein the coil portion comprises:
a spiral portion having a spiral form; and
an outlet portion extending from opposite ends of the spiral portion and exiting from the magnetic portion; and
the magnetic portion comprises either one or both of an outlet groove and an outlet hole enabling the outlet portion to exit from the magnetic portion.
8 . The wireless power transmission module of claim 7 , wherein the outlet hole penetrates through the sidewall portion of the magnetic portion.
9 . The wireless power transmission module of claim 7 , wherein the outlet hole penetrates through the base portion of the magnetic portion.
10 . The wireless power transmission module of claim 9 , further comprising a guide groove formed in a bottom surface of the magnetic portion and connecting the outlet hole to an outer circumferential surface of the sidewall portion.
11 . The wireless power transmission module of claim 6 , wherein a material of the magnetic field concentration portion is different from either one or both of a material of the base portion and a material of the sidewall portion.
12 . The wireless power transmission module of claim 1 , wherein the coil accommodation portion comprises an inclined side surface and a flat bottom surface.
13 . The wireless power transmission module of claim 1 , wherein the magnetic field concentration portion comprises a flat end portion.
14 . A wireless power transmission module comprising:
a coil portion having a solenoid form and comprising a hollow portion, wherein an upper end and a lower end of the coil portion have different internal diameters; and
a magnetic portion combined with the coil portion and comprising a magnetic field concentration portion combined with the coil portion and having a pillar form penetrating through the hollow portion of the coil portion. wherein a height of the magnetic field concentration portion is equal to a height of the coil portion.
15 . An electronic device comprising:
a case; and
a wireless power transmission module disposed in the case and comprising:
a coil portion having a solenoid form and comprising a hollow portion, wherein an upper end and a lower end of the coil portion have different internal diameters; and
a magnetic portion comprising:
a coil accommodation portion in which the coil portion is disposed, the coil accommodation portion being formed as a hollow space in an upper surface of the magnetic portion, and having a bowl form having a greatest width at the upper surface of the magnetic portion; and
a magnetic field concentration portion protruding upwardly from a central portion of the coil accommodation portion through the hollow portion of the coil portion.
16 . The electronic device of claim 15 , wherein a portion of the coil portion is wound around at least a portion of an outer circumferential surface of the magnetic field concentration portion.
17 . A wireless power transmission module comprising:
a magnetic portion comprising:
a coil accommodation portion formed as a hollow space in an upper surface of the magnetic portion, wherein a cross-sectional area of the hollow space increases in a direction from a bottom of the hollow space to the upper surface of the magnetic portion; and
a magnetic field concentration portion disposed on a bottom surface of the coil accommodation portion; and
a coil portion disposed on a surface of the coil accommodation portion without covering an upper end of the magnetic field concentration portion.
18 . The wireless power transmission module of claim 17 , wherein the hollow space has a conical form in which a diameter of the hollow space linearly increases from the bottom of the hollow space to the upper surface of the magnetic portion.
19 . The wireless power transmission module of claim 17 , wherein a cross-sectional area of the magnetic field concentration portion increases or decreases from a lower end of the magnetic field concentration portion disposed on the bottom surface of the coil accommodation portion to an upper end of the magnetic field concentration portion.
20 . The wireless power transmission module of claim 17 , further comprising a voltage converting portion configured to convert AC or DC power received from an external source to AC power having a wireless power transmission frequency, and apply the AC power having the wireless power transmission frequency to the coil portion to transmit wireless power.