A non-contact power reception apparatus is provided, in which a power reception coil for a charging system and a loop antenna for an electronic settlement system are mounted on a battery pack and a cover case of a portable terminal such that the power reception coil is arranged in the center thereof and the loop antenna is disposed outside the power reception coil, so that a mode of receiving a wireless power signal and a mode of transmitting and receiving data are selectively performed, thereby preventing interference from harmonic components and enabling non-contact charging and electronic settlement using a single portable terminal. A jig for fabricating a core to be mounted to the non-contact power reception apparatus is provided.

An inductor coil includes a wire which is wound in alternating layers such that the surface area of the wire in each winding viewed from above or below the coil is substantially equal in each half of the coil defined by a line bisecting the center point in each layer. The layers are also wound in a serpentine fashion to balance the capacitance between layers. The substantially equal surface area of wire in each half of a coil layer and in adjacent coil layers results in a balanced capacitance of the coil which, in turn, results in reduced common mode noise.

An inductor coil includes a wire which is wound in alternating layers such that the surface area of the wire in each winding viewed from above or below the coil is substantially equal in each half of the coil defined by a line bisecting the center point in each layer. The layers are also wound in a serpentine fashion to balance the capacitance between layers. The substantially equal surface area of wire in each half of a coil layer and in adjacent coil layers results in a balanced capacitance of the coil which, in turn, results in reduced common mode noise.

An electro-magnetic device is provided, including a first winding set of nested windings, and a second winding set of nested windings positioned adjacent to the first winding set. A method of making an electro-magnetic device including a first winding set of nested windings, and a second winding set of nested windings positioned adjacent to the first winding set is also provided.

An electro-magnetic device is provided, including a first winding set of nested windings, and a second winding set of nested windings positioned adjacent to the first winding set. A method of making an electro-magnetic device including a first winding set of nested windings, and a second winding set of nested windings positioned adjacent to the first winding set is also provided.

A transformer includes a hollow bobbin, a coil and a magnetic core. The hollow bobbin has a first end surface and a second end surface opposite to each other. In a direction perpendicular to the normals of the first end surface and the second end surface of the hollow bobbin, the hollow bobbin is not configured with any blocking plates extending laterally from the first end surface and the second end surface. The coil is wound on the hollow bobbin to form a bobbin assembly. The magnetic core has an accommodating space, wherein the bobbin assembly is disposed in the accommodating space. A manufacturing method of the transformer is also provided.

A coil unit may include coil holding member configured to hold a coil; and a coil held by the coil holding member and formed by a conducting wire in a wound state. A direction perpendicular to a length direction of the conducting wire is a thickness direction of the coil. The coil holding member may include an abutment surface configured to abut against one end surface in the thickness direction of the coil, a convex unit protruding from the abutment surface and around which the conducting wire is wound, and a coil pressing unit extending from a front end surface of the convex unit and configured to press the other end surface in the thickness direction of the coil.

A coil unit may include coil holding member configured to hold a coil; and a coil held by the coil holding member and formed by a conducting wire in a wound state. A direction perpendicular to a length direction of the conducting wire is a thickness direction of the coil. The coil holding member may include an abutment surface configured to abut against one end surface in the thickness direction of the coil, a convex unit protruding from the abutment surface and around which the conducting wire is wound, and a coil pressing unit extending from a front end surface of the convex unit and configured to press the other end surface in the thickness direction of the coil.

A coil unit may include an even number of coils comprising a first coil and a second coil; and a coil holding member which holds the even number of the coils. An outer peripheral face of the coil holding member may include a side-face pair comprising a first side face and a second side face which are substantially parallel to each other. The first side face may be formed with a first protruded part around which the first coil is wound, the first protruded part being protruded to an outer peripheral side with respect to the coil holding member. The second side face may be formed with a second protruded part around which the second coil is wound, the second protruded part being protruded to an outer peripheral side with respect to the coil holding member. The first coil and the second coil may be structured from one conducting wire.

A coil unit may include an even number of coils comprising a first coil and a second coil; and a coil holding member which holds the even number of the coils. An outer peripheral face of the coil holding member may include a side-face pair comprising a first side face and a second side face which are substantially parallel to each other. The first side face may be formed with a first protruded part around which the first coil is wound, the first protruded part being protruded to an outer peripheral side with respect to the coil holding member. The second side face may be formed with a second protruded part around which the second coil is wound, the second protruded part being protruded to an outer peripheral side with respect to the coil holding member. The first coil and the second coil may be structured from one conducting wire.