Wireless charging device with improved charging efficiency and heat generation reduction effect
A wireless charging device is proposed. The wireless charging device may maximize charging efficiency improvement and heat generation reduction effect by appropriately arranging a second magnetic body on a first magnetic body, resulting in an offset of a magnetic flux linkage occurring inside an aluminum shield due to a magnetic field having passed through the first magnetic body.
1 . A wireless charging device comprising:
a first magnetic body having a plane shape;
a second magnetic body having a plane shape and disposed on the first magnetic body;
a coil disposed under the first magnetic body; and
a shield disposed on the second magnetic body,
wherein the shield comprises an aluminum material,
wherein the first magnetic body comprises a soft magnetic material, and
wherein the second magnetic body comprises a hard magnetic material.
2 . The wireless charging device of claim 1 , wherein the first magnetic body comprises:
a central part that extends from a center of the first magnetic body to a predetermined distance outward from the center; and
an edge part that is a remaining region other than the central part of the first magnetic body,
wherein an area of the central part is 20% to 80% of a total area of the first magnetic body.
3 . The wireless charging device of claim 2 , wherein the second magnetic body is disposed on the central part of the first magnetic body and an area of the second magnetic body is 1% to 100% of an area of the coil.
4 . The wireless charging device of claim 2 , wherein the second magnetic body has a frame shape disposed along a boundary of the central part or the edge part of the first magnetic body.
5 . The wireless charging device of claim 2 , wherein the second magnetic body extends along an outer periphery of the edge part of the first magnetic body.
6 . The wireless charging device of claim 2 , wherein the second magnetic body is radially disposed with respect to the center of the first magnetic body.
7 . The wireless charging device of claim 1 ,
wherein the soft magnetic material comprises at least one of Fe, Fe—Si, Fe—Si—Al, Fe—Al, Fe—Co, Fe—Si—Cr, Stainless steel, Ni—Fe, Ni—Fe—Mo, Mn—Zn Ferrite, Ni—Zn Ferrite, Fe—Si—B-based amorphous, Fe—Si—B—Cu—Nb-based nanocrystal grains, or any combination thereof.
8 . The wireless charging device of claim 1 ,
wherein the hard magnetic material comprises a permanent magnet.
9 . The wireless charging device of claim 8 , wherein the permanent magnet comprises at least one of an alnico magnet, a ferrite magnet, a rare earth magnet, a rubber magnet, a plastic magnet, a neodymium (NdFeB) magnet, a FeCrCo magnet, or any combination thereof.
10 . The wireless charging device of claim 1 , wherein the second magnetic body has a residual induction (Br) of 2300 G to 2500 G.
11 . The wireless charging device of claim 1 , wherein the second magnetic body has a coercive force (bHc) of 2100 Oe to 2300 Oe.
12 . The wireless charging device of claim 1 , wherein the second magnetic body has an intrinsic coercive force (iHc) of 3000 Oe to 3200 Oe.
13 . The wireless charging device of claim 1 , wherein the second magnetic body has a maximum energy product ((BH)max) of 1.35 MG·Oe to 1.55 MG·Oe.
14 . The wireless charging device of claim 1 , wherein the second magnetic body has a density of 3.5 g/cm 3 to 3.7 g/cm 3 .
15 . The wireless charging device of claim 1 , wherein the coil comprises a plurality of wires being wound in parallel, and
wherein the plurality of wires constitutes a spiral pattern.
16 . A vehicle comprising:
a wireless charging device comprising:
a first magnetic body having a plane shape,
a second magnetic body having a plane shape and disposed on the first magnetic body,
a coil disposed under the first magnetic body, and
a shield disposed on the second magnetic body,
wherein the shield comprises an aluminum material,
wherein the first magnetic body comprises a soft magnetic material, and
wherein the second magnetic body comprises a hard magnetic material.
17 . The vehicle of claim 16 , wherein the first magnetic body comprises:
a central part that extends from a center of the first magnetic body to a predetermined distance outward from the center; and
an edge part that is a remaining region other than the central part of the first magnetic body,
wherein an area of the central part is 20% to 80% of a total area of the first magnetic body.
18 . The vehicle of claim 17 , wherein the second magnetic body is disposed on the central part of the first magnetic body and an area of the second magnetic body is 1% to 100% of an area of the coil.
19 . The vehicle of claim 16 ,
wherein the soft magnetic material comprises at least one of Fe, Fe—Si, Fe—Si—Al, Fe—Al, Fe—Co, Fe—Si—Cr, Stainless steel, Ni—Fe, Ni—Fe—Mo, Mn—Zn Ferrite, Ni—Zn Ferrite, Fe—Si—B-based amorphous, Fe—Si—B—Cu—Nb-based nanocrystal grains, or any combination thereof.
20 . The vehicle of claim 16 ,
wherein the hard magnetic material comprises a permanent magnet.