A mobile terminal is provided with a housing, a circuit board included in the housing and having a thickness direction normal to a plane of the circuit board, a battery pack included in the housing, and a non-contact charging module included in the housing. The non-contact charging module includes a charging coil formed of a wound conducting wire; a communication coil arranged adjacent to the charging coil; and a magnetic sheet on which the charging coil and the communication coil are arranged. The magnetic sheet has four edges that collectively define a rectangular profile of the magnetic sheet, and at most three pairs of adjacent edges respectively meet to form at most three corners. At least a portion of the non-contact charging module overlaps with the circuit board as viewed in the thickness direction of the circuit board.

A mobile terminal is provided with a housing, a circuit board included in the housing and having a thickness direction normal to a plane of the circuit board, a battery pack included in the housing, and a non-contact charging module included in the housing. The non-contact charging module includes a charging coil formed of a wound conducting wire; a communication coil arranged adjacent to the charging coil; and a magnetic sheet on which the charging coil and the communication coil are arranged. The magnetic sheet has four edges that collectively define a rectangular profile of the magnetic sheet, and at most three pairs of adjacent edges respectively meet to form at most three corners. At least a portion of the non-contact charging module overlaps with the circuit board as viewed in the thickness direction of the circuit board.

An HMD includes first and second batteries mounted therein, and includes a plurality of power receivers that receive power from the first and second batteries by wireless transmission, a power supply manager that monitors states of the first and second batteries, a communication interface that performs wireless communication with the first and second batteries, and a plurality of limiters that limit the power received by the plurality of power receivers. A controller causes the limiters to limit power, which is supplied to a load, according to a power use state of the load in the device, and the power supply manager acquires information of remaining power storage amounts of the first and second batteries through the communication interface and displays the acquired information on a display. Therefore, since it is possible to supply power required for driving the device while wearing the HMD, the HMD can be continuously used.

A wireless power feeding system is provided, comprising a power transmission apparatus configured to transmit predetermined transmission power and a power reception apparatus configured to receive the transmission power and generate input voltage according to the transmission power, wherein the power transmission apparatus includes a power transmission control unit configured to control an amount of the transmission power, the power transmission control unit is configured to receive a modulation signal from the power reception apparatus, and to reduce the transmission power in a case where the modulation signal is not received for a predetermined period after receiving the previous modulation signal, and the power transmission apparatus and the power reception apparatus are configured to control the input voltage to be larger than a predetermined first threshold and below a second threshold which is larger than the first threshold.

A wireless power feeding system is provided, comprising a power transmission apparatus configured to transmit predetermined transmission power and a power reception apparatus configured to receive the transmission power and generate input voltage according to the transmission power, wherein the power transmission apparatus includes a power transmission control unit configured to control an amount of the transmission power, the power transmission control unit is configured to receive a modulation signal from the power reception apparatus, and to reduce the transmission power in a case where the modulation signal is not received for a predetermined period after receiving the previous modulation signal, and the power transmission apparatus and the power reception apparatus are configured to control the input voltage to be larger than a predetermined first threshold and below a second threshold which is larger than the first threshold.

A stationary induction charging device for wireless energy transfer may include a housing base, a housing cover, a transmitting coil, at least one magnetic field conductor, and a power electronics unit. The housing base and the housing cover may define an installation space and a venting space. The transmitting coil, the magnetic field conductor, and the power electronics unit may be arranged in the installation space. The housing base may include a plurality of coolant channels through which a liquid is flowable such that the housing base forms a heat exchanger. The plurality of coolant channels may be distributed within the housing base such that a region of the housing base arranged opposite the power electronics unit and/or a region of the housing base arranged opposite the venting space has a higher coolant channel density than a region of the housing base arranged opposite the transmitting coil.

A stationary induction charging device for wireless energy transfer may include a housing base, a housing cover, a transmitting coil, at least one magnetic field conductor, and a power electronics unit. The housing base and the housing cover may define an installation space and a venting space. The transmitting coil, the magnetic field conductor, and the power electronics unit may be arranged in the installation space. The housing base may include a plurality of coolant channels through which a liquid is flowable such that the housing base forms a heat exchanger. The plurality of coolant channels may be distributed within the housing base such that a region of the housing base arranged opposite the power electronics unit and/or a region of the housing base arranged opposite the venting space has a higher coolant channel density than a region of the housing base arranged opposite the transmitting coil.

A battery module for a hearing device is configured for inductive resonance charging. The battery module has a secondary cell, a blocking sleeve that encloses the secondary cell and shields the secondary cell against a magnetic field, a jacket formed from permeable material outside the blocking sleeve, and an induction coil outside the jacket for receiving energy inductively. The induction coil and the jacket form a receiving antenna for receiving the energy. The material and/or the geometric structure of the blocking sleeve, the jacket made of permeable material, and/or the induction coil is/are additionally selected in such a way that the battery module, in particular the induction coil, has a quality factor of at least 35 for receiving energy at a predetermined value of a charging frequency that is employed by a charging device that generates a magnetic alternating field.

A battery module for a hearing device is configured for inductive resonance charging. The battery module has a secondary cell, a blocking sleeve that encloses the secondary cell and shields the secondary cell against a magnetic field, a jacket formed from permeable material outside the blocking sleeve, and an induction coil outside the jacket for receiving energy inductively. The induction coil and the jacket form a receiving antenna for receiving the energy. The material and/or the geometric structure of the blocking sleeve, the jacket made of permeable material, and/or the induction coil is/are additionally selected in such a way that the battery module, in particular the induction coil, has a quality factor of at least 35 for receiving energy at a predetermined value of a charging frequency that is employed by a charging device that generates a magnetic alternating field.

The described shielding system comprises a first shield and a second shield. The first shield comprises a first plurality of conductive segments extending from a first location. The first plurality of conductive segments are separated from each other by a first plurality of gaps. The second shield comprises a second plurality of conductive segments extending from a second location. The second plurality of conductive segments are separated from each other by a second plurality of gaps. An insulator may be interposed between the first shield and the second shield. The first plurality of gaps may at least partially align with the second plurality of conductive segments and the second plurality of gaps may at least partially align with the first plurality of conductive segments.