This disclosure relates to the inductive charging of portable electronic devices. In particular, a charging assembly is disclosed that allows a portable electronic device to be charged in multiple orientations with respect to a charging device. The charging assembly includes two or more separate inductive receiving coils. The inductive receiving coils can be arranged orthogonally with respect to one another by wrapping one or more secondary receiving coils around an antenna. By orienting the receiving coils orthogonally with respect to one another, the likelihood of at least one of the receiving coils being aligned with a charging field emitted by a charging device increases substantially.

Charging method for a superconductor magnet system with reduced stray field, weight and space includes: arranging the system within a charger magnet bore; with T.sub.main>T.sub.main.sup.crit and T.sub.shield>T.sub.shield.sup.crit, applying a current I.sub.charger to the charger magnet and increasing I.sub.charger to a first current I.sub.1>0; lowering a main superconductor bulk magnet temperature T.sub.main to an operation temperature T.sub.main.sup.op, with T.sub.main.sup.op<T.sub.main.sup.crit, while keeping T.sub.shield>T.sub.shield.sup.crit; lowering I.sub.charger to a second current I.sub.2<0, thereby inducing a persistent current IP.sub.main in the main magnet; lowering a shield magnet temperature T.sub.shield to an operation temperature T.sub.shield.sup.op, with T.sub.shield.sup.op<T.sub.shield.sup.crit; increasing I.sub.charger to zero, thereby inducing a persistent current IP.sub.shield in the shield magnet; removing the magnet system from the charger bore, and keeping T.sub.main≤T.sub.main.sup.op with T.sub.main.sup.op<T.sub.main.sup.crit and T.sub.shield≤T.sub.shield.sup.op with T.sub.shield.sup.op<T.sub.shield.sup.crit; where: T.sub.main.sup.crit: main magnet critical temperature and T.sub.shield.sup.crit: shield magnet critical temperature.

Charging method for a superconductor magnet system with reduced stray field, weight and space includes: arranging the system within a charger magnet bore; with T.sub.main>T.sub.main.sup.crit and T.sub.shield>T.sub.shield.sup.crit, applying a current I.sub.charger to the charger magnet and increasing I.sub.charger to a first current I.sub.1>0; lowering a main superconductor bulk magnet temperature T.sub.main to an operation temperature T.sub.main.sup.op, with T.sub.main.sup.op<T.sub.main.sup.crit, while keeping T.sub.shield>T.sub.shield.sup.crit; lowering I.sub.charger to a second current I.sub.2<0, thereby inducing a persistent current IP.sub.main in the main magnet; lowering a shield magnet temperature T.sub.shield to an operation temperature T.sub.shield.sup.op, with T.sub.shield.sup.op<T.sub.shield.sup.crit; increasing I.sub.charger to zero, thereby inducing a persistent current IP.sub.shield in the shield magnet; removing the magnet system from the charger bore, and keeping T.sub.main≤T.sub.main.sup.op with T.sub.main.sup.op<T.sub.main.sup.crit and T.sub.shield≤T.sub.shield.sup.op with T.sub.shield.sup.op<T.sub.shield.sup.crit; where: T.sub.main.sup.crit: main magnet critical temperature and T.sub.shield.sup.crit: shield magnet critical temperature.

Charging devices according to embodiments of the present technology may include a housing including an input configured to receive power from a power source and provide power to internal components of the charging device. The charging devices may include a ferrite. The ferrite may be coupled with electrical ground. The charging devices may also include a conductive coil seated in the ferrite. The conductive coil may be configured to generate an electromagnetic field from an AC signal.

Charging devices according to embodiments of the present technology may include a housing including an input configured to receive power from a power source and provide power to internal components of the charging device. The charging devices may include a ferrite. The ferrite may be coupled with electrical ground. The charging devices may also include a conductive coil seated in the ferrite. The conductive coil may be configured to generate an electromagnetic field from an AC signal.

A method of designing a magnetic shield comprising a structure enclosing a space, the structure comprising passive magnetic shielding material and a winding configured to produce a specified magnetic within the structure when current is passed through the winding, is disclosed. The method comprises determining an optimised configuration of the winding accounting for the presence of the passive magnetic shield material by implementing one or more boundary conditions at the surface of the passive magnetic shielding material.

A nanocrystalline magnetic conductive sheet for wireless charging and a preparation method therefor are provided. The nanocrystalline magnetic conductive sheet includes a composition of Fe.sub.(100-x-y-z-α-β-γ)M.sub.xCu.sub.yM′.sub.zSi.sub.αB.sub.βX.sub.γ, saturation magnetic induction is greater than or equal to 1.25 T. The preparation method includes preparing an alloy with a preset composition of into an alloy strip with an initial state of amorphousness by a single roll rapid quenching method, annealing an amorphous alloy strip according to a preset annealing process, to obtain a nanocrystalline strip, performing a magnetic fragmentation process on the nanocrystalline strip, to obtain the nanocrystalline magnetic conductive sheet for wireless charging.

A nanocrystalline magnetic conductive sheet for wireless charging and a preparation method therefor are provided. The nanocrystalline magnetic conductive sheet includes a composition of Fe.sub.(100-x-y-z-α-β-γ)M.sub.xCu.sub.yM′.sub.zSi.sub.αB.sub.βX.sub.γ, saturation magnetic induction is greater than or equal to 1.25 T. The preparation method includes preparing an alloy with a preset composition of into an alloy strip with an initial state of amorphousness by a single roll rapid quenching method, annealing an amorphous alloy strip according to a preset annealing process, to obtain a nanocrystalline strip, performing a magnetic fragmentation process on the nanocrystalline strip, to obtain the nanocrystalline magnetic conductive sheet for wireless charging.

This application provides a dry-type transformer and a winding method thereof. The dry-type transformer includes a magnetic core, a first coil, a second coil, and a shielding component. The first coil is disposed around the exterior of the magnetic core, and the second coil is disposed around the exterior of the first coil. In a direction from the iron core to the second coil, the shielding component includes a first conducting layer, a second conducting layer, a third conducting layer, and a fourth conducting layer that are sequentially disposed at intervals, the first coil is disposed between the magnetic core and the first conducting layer, and the second coil is disposed between the second conducting layer and the third conducting layer.

Electromagnetic shields, vehicles, wireless charging systems, and related methods are disclosed. An electromagnetic shield includes a shield member including a coil side to face one or more inductive coils. The electromagnetic shield also includes one or more perimeter shield members configured in a loop proximate to a perimeter of the coil side of the shield member. The shield member and the one or more perimeter shield members are configured to shield electromagnetic radiation emitted by the one or more inductive coils.