Embodiments of this application disclose a wireless charging system. The wireless charging system includes a first electronic device, a wireless charging device, and a second electronic device. The wireless charging device is located between the first electronic device and the second electronic device. The wireless charging device is an auxiliary device of the first electronic device and is physically connected to the first electronic device, the wireless charging device includes a receiver circuit and a housing, the receiver circuit includes a receiver coil, and the receiver coil is located on an inner side of the housing. The first electronic device is configured to: charge the wireless charging device, charge the second electronic device through the wireless charging device, and receive power from the second electronic device through the wireless charging device.

A receiver system for a wireless charging system includes a receiver antenna forming a first planar layer; a shielding material adjacent to the receiver antenna, the shielding material forming a second planar layer; and a dielectric separation material layer disposed between the receiver antenna and the shielding material layer, wherein the dielectric separation material comprises a thickness of 0.1 mm or higher and a dissipation factor of 0.01 or lower at a 1 MHz frequency, and wherein the dielectric separation material is configured to maintain an intrinsic quality factor “Q” value of the receiver antenna above a target intrinsic Q value.

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.

According to one aspect of the present disclosed subject matter, a receiver inductively powered by a transmitter for powering a load, the receiver comprising: a resonance circuit capable of tuning its resonance frequency for coupling with the transmitter and generate AC voltage; a power supply section configured to rectify the AC voltage and adjust a DC current and a DC voltage to the load; and a control and communication section designed to set parameters for the receiver and communicate operation points (OP) to the transmitter, wherein the parameters and the OP derived from determining a minimal power loss of the receiver.

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.

A power transmitter for wireless power transfer includes a control and communications unit, an inverter circuit, a coil, and a shielding. The control and communications unit is configured to provide power control signals to control a power level of a power signal configured for transmission to a power receiver, receive a receiver power request from a power receiver, provide a power request to an external power supply, based on the receiver power request, determine if a power signal at the coil is compliant with the receiver power request, and, if the power signal at the coil is compliant with the receiver power request, continue to operate for wireless power transmission. The coil is configured to transmit the power signal to a power receiver. The shielding comprises a ferrite core.

A wireless charging system for recharging batteries in a medical environment includes a charging station. The charging station may include an opening to receive batteries and an outlet for dispensing charged batteries, wherein the outlet comprises a slot in a front cover. The charging station also includes a wireless power transmitter having a transmitting antenna.

Discussed is a wireless charging device which can change the direction of a magnetic field, generated in a transmission coil, through a vertically and horizontally rotatable repeater, and can hold a user terminal in parallel with the repeater, thereby transmitting wireless power in various directions and at various angles. The wireless charging device includes a case, a flat plate core disposed in the case, multiple transmission coils arranged parallel to each other on the flat plate core, a terminal holder including a repeater therein and disposed on the top surface of the case while sloping with respect to the top surface of the case, and a moving member for moving the terminal holder in the direction in which the plurality of transmission coils are arranged.

A shielded inductor and a method of making a shielded inductor are provided. The shielded inductor includes a core body surrounding a conductive coil, leads in electrical communication with the coil, and a shield covering at least parts of the outer surface of the core body. An insulating material may be provided between parts of the core body and parts of the shield. A method of making a shielded inductor is also provided.

A method for manufacturing a ferrite sheet is provided. A method for manufacturing a ferrite sheet comprises the steps of: preparing a ferrite block body having a shape of a cylindrical or polygonal column; and cutting the ferrite block body to be separated into plate-shaped sheets having a predetermined thickness.