Induction coil structure for wireless charging device
An induction coil structure for a wireless charger includes at least one first coil, at least one second coil, a first magnetic conductor and a second magnetic conductor. The first coil is disposed in a first layer of an induction coil. The second coil is disposed in a second layer of the induction coil. The first magnetic conductor is located between the first coil and the second coil, wherein a first surface and a second surface of the first magnetic conductor are superposed on the first coil and the second coil, respectively. The second magnetic conductor is superposed on a surface of the second coil that is not superposed on the first magnetic conductor. The first magnetic conductor includes a hole, and a wire for winding the first coil extends from the first layer to the second layer via the hole, to wind the second coil.
1. An induction coil structure for a wireless charger, comprising:
at least one first coil, disposed in a first layer of an induction coil;
at least one second coil, disposed in a second layer of the induction coil;
a first magnetic conductor, located between the at least one first coil and the at least one second coil, wherein a first surface of the first magnetic conductor is superposed on the at least one first coil and a second surface of the first magnetic conductor is superposed on the at least one second coil; and
a second magnetic conductor, superposed on a surface of one of the at least one second coil wherein the surface is not superposed on the first magnetic conductor;
wherein the first magnetic conductor comprises a hole, and a wire for winding a first coil of the at least one first coil extends from the first layer to the second layer via the hole, to wind a second coil of the at least one second coil;
wherein the at least one first coil comprises two first coils, which have same winding numbers and are superposed on each other, and the at least one second coil comprises a single second coil, which is formed by attaching two wires respectively corresponding to the two first coils and winding the two wires on a same plane between the first magnetic conductor and the second magnetic conductor.
2. The induction coil structure of claim 1 , wherein the first magnetic conductor comprises:
a first sheet body, of which a side comprises a first notch; and
a second sheet body, of which a side comprises a second notch;
wherein the side of the first sheet body comprising the first notch and the side of the second sheet body comprising the second notch are connected to form the first magnetic conductor with a sheet shape, and the first notch and the second notch are combined together to form the hole.
3. The induction coil structure of claim 1 , wherein areas of the first surface and the second surface of the first magnetic conductor are large enough to let the at least one first coil and the at least one second coil to be completely superposed on the first surface and the second surface of the first magnetic conductor respectively.
4. The induction coil structure of claim 1 , wherein the second magnetic conductor comprises:
a sheet body, of which an area of a surface is large enough to let the at least one second coil to be completely superposed on the surface.
5. The induction coil structure of claim 1 , wherein the first magnetic conductor and the second magnetic conductor are respectively a magnetic material with high magnetic permeability.
6. The induction coil structure of claim 5 , wherein the magnetic material is a Mn—Zn core, a Ni—Zn core, an iron powder core, a molypermalloy powder (MPP) core, a sendust core, a ferrite core or a high flux core.