Provided is a coil structure including an inductor coil having a self-bonding wire structure and including a central hole, a detection coil electromagnetically coupled to the inductor coil, a support unit surrounding at least a portion of an outer periphery of the inductor coil, and a housing including an upper magnetic body and a lower magnetic body facing each other in a vertical direction with the inductor coil therebetween to form an inner space in which the inductor coil and the detection coil are provided, the upper magnetic body and the lower magnetic body each including a protrusion inserted into the central hole of the inductor coil.

The present disclosure provides a magnetic component including a winding, a first magnetic core and a circuit component, and a wireless power-transferring device including the magnetic component. The winding is formed by winding a coil, and having a first penetration portion at a middle portion of the winding. The first magnetic core is disposed at a side of the winding, and a first insulating support portion is disposed between the first magnetic core and the winding. The circuit component is located within the first penetration portion and electrically connected with the winding. Disposing the circuit component within the first penetration portion at the middle portion of the winding can effectively save space.

Sensing methods and systems for transformers, and the construction thereof, are described herein. Example transformer systems and example methods for constructing a core for the system are disclosed. The example system includes a core with a bottom plate, two or more limbs mounted to the bottom plate and a top plate enclosing the core. At least one of the bottom plate, the limbs and the top plate is formed with a sensing component therein. The sensing component can be mounted to a spacer layer assembled within a stack of laminated layers. The sensing component can be mounted within a path defined within the spacer layer, for example. Methods for detecting operating conditions within the transformer are also disclosed.

A wireless power receiving apparatus, according to an example embodiment, may include a receiving coil in which a first wire including a copper core and a second wire not including a copper core are wound around a same axis. The second wire may be located at a pitch of the first wire, and a diameter of the second wire may correspond to the pitch of the first wire.

A watch charging assembly 10 has a coil 22, a membrane 24 and a back plate 12. The coil 22 is configured to pass electric current received at a first or second contact pad 27, 28. The membrane 24 is affixed to the coil 22 forming a membrane and coil assembly 20. The back plate 12 has a pair of conductive inserts 30. Each conductive insert 30 is aligned with and contacts each contact pad 27, 28. The back plate 12 with the coil 22 and membrane 24 form the charging assembly 10. The charging assembly 10 is configured to form a bottom or underside or, alternatively, be attached to a bottom or underside of a rechargeable battery operated wristwatch 100 and when worn, the charging assembly 10 receives electric current from the wearer to charge a rechargeable battery of the wristwatch 100. The coil 22 can be a pancake coil.

A power transmitter for wireless power transfer includes a sensing system, a feedback mechanism and a control and communications unit includes a controller configured to receive object detection data from the sensing system, if a power receiver is detected, reset an alert timer, if the power receiver has been detected and a disconnect is detected, determine if an alert timer value is greater than an alert threshold, if a disconnect is detected and the alert timer value is greater than the alert threshold, instruct the feedback mechanism to output an alert. The power transmitter further includes an inverter circuit configured to receive a direct current (DC) power and convert the input power to a power signal and a coil configured to transmit the power signal to a power receiver, the coil formed of wound Litz wire and including at least one layer, the coil defining, at least, a top face.

An insulating device includes: a first inductor including a first coil layer located in a first plane; a second inductor separated from the first inductor, the second inductor including a second coil layer located in the first plane, a central axis of the second coil layer being positioned inside the first coil layer; and an insulating layer located between the first inductor and the second inductor.

Disclosed herein is a coil component that includes an insulating substrate, a first coil part formed on the first surface of the insulating substrate, and a second coil part formed on the second surface of the insulating substrate. At least an innermost turn of the first coil part is radially separated by spiral-shaped slits into three or more conductor parts. At least an innermost turn of the second coil part is radially separated by spiral-shaped slits into three or more conductor parts. Inner peripheral ends of respective innermost to outermost conductor parts of the three or more conductor parts of the first coil part are connected to inner peripheral ends of the respective outermost to innermost conductor parts of the three or more conductor parts of the second coil part.

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.

Provided are a large area type complex magnetic field shielding sheet and a wireless power transfer module including the same. A large area type complex magnetic field shielding sheet wherein at least one of an overall width, an overall length, and a diameter is 100 mm or more may include a main shielding layer arranged so that a plurality of ferrite block bodies each having a predetermined area are adjacent to each other, and an auxiliary shielding layer formed of at least one magnetic sheet having a predetermined area and laminated on the main shielding layer through an adhesive layer, wherein a boundary region between two ferrite block bodies disposed to be adjacent each other is disposed to be located in an inner region of the magnetic sheet and thus a magnetic field which leaks into a gap between the two ferrite block bodies is blocked by the magnetic sheet.