An electronic device according to an embodiment of the present invention is configured to wirelessly receive electric power from a wireless electric power transfer device. A power reception unit of the electronic device comprises: a core having a predetermined length and having magnetic flux concentration portions formed at lengthwise side portions thereof; and a coil wound along an outer periphery of the core to form magnetic flux density in the magnetic flux concentration portions, the magnetic flux density having a magnitude equal to or larger than a predetermined value.

A full duplex, low latency, near field data link controls a resonant induction, wireless power transfer system for recharging batteries. In an electric vehicle embodiment, an assembly is aligned with respect to a ground assembly to receive a charging signal. The vehicle assembly includes one or more charging coils and a first full duplex inductively coupled data communication system that communicates with a ground assembly including one or more charging coils and a second full duplex inductively coupled data communications system. The charging coils of the ground assembly and the vehicle assembly are selectively enabled based on geometric positioning of the vehicle assembly relative to the ground assembly for charging. As appropriate, the transmit/receive system of the ground assembly and/or the vehicle assembly are adjusted to be of the same type to enable communication of charging management and control data between the ground assembly and the vehicle assembly during charging.

A control system is provided for controlling a power receiving circuit which is configured for receiving power wirelessly and producing an output voltage. The power receiving circuit has a resonant LC circuit including an inductive element and a capacitive element coupled in parallel. The control system includes a switching circuit coupled in parallel to the resonant LC circuit, and a feedback loop circuit configured for regulating the output voltage by controlling duration during which the switching circuit is in a conductive state in each cycle of a voltage developed across the resonant LC circuit.

A wireless power transmitter is provided. The wireless power transmitter includes a power supply unit that supplies Alternating Current (AC) power having a predetermined voltage value, a rectification unit that is connected to the power supply unit, and rectifies the AC power, a voltage adjustment unit that is connected to the rectification unit, and adjusts a magnitude of an output voltage value of the rectified power, and outputs the adjusted power to a power transmission unit, the power transmission unit that generates the adjusted power output from the voltage adjustment unit as a signal in a form in which wireless power transmission is possible, and transmits the generated signal to a wireless power receiver, and a control unit that controls the magnitude of the output voltage value of the rectified power to be adjusted by the voltage adjustment unit in accordance with a predetermined criterion.

A charge calculation apparatus, system and method allow for a controller to administer an electric power charging operation to one or more client devices, such as an electric vehicle. The vehicle provides its ID to the controller, which in turn calculates a tax according to the vehicle making the request, and other factors such as taxing jurisdiction, amount of electricity used, timing, etc. By controlling the charging operation in this way, the taxing authorities are able to collect tax revenue for use in maintaining roads from the users of those roads by monitoring which vehicles are using electricity to operate the vehicles on the roads. By keeping track of the vehicle's movement within different tax jurisdictions, the tax may be apportioned amongst the different taxing authorities.

A charge calculation apparatus, system and method allow for a controller to administer an electric power charging operation to one or more client devices, such as an electric vehicle. The vehicle provides its ID to the controller, which in turn calculates a tax according to the vehicle making the request, and other factors such as taxing jurisdiction, amount of electricity used, timing, etc. By controlling the charging operation in this way, the taxing authorities are able to collect tax revenue for use in maintaining roads from the users of those roads by monitoring which vehicles are using electricity to operate the vehicles on the roads. By keeping track of the vehicle's movement within different tax jurisdictions, the tax may be apportioned amongst the different taxing authorities.

A solid-state transformer (10) that maintains output voltage continuity during maintenance is provided. The solid-state transformer includes an input end (101), a plurality of power units (U1 to UM), and an output end (102). The input end is configured to input first three-phase alternating-current electrical power. The plurality of power units are connected in parallel to the input end and the output end, and each power unit is configured to convert the first three-phase alternating-current electrical power into first direct-current electrical power, and output the first direct-current electrical power from the output end. A power supply system (100) including the foregoing solid-state transformer is further included.

Systems and techniques are provided for a power receiver circuit. A power generating mechanism may include power generating elements that may generate alternating current signals. Rectifier circuit may include rectifiers that may generate a direct current signal from an alternating current signal, and diodes. Group circuits that may connect groups of rectifier circuits in electrical circuits to combine the direct current signals from the rectifier circuits in a group into a single direct current signal. A step down converter may be connected to the group circuits. The step down converter may convert a direct current signal to a direct current signal of a target voltage level. An output switch may be connected to the step down converter. A linear regulator may be connected to the step down converter. A microcontroller may be connected to the linear regulator and the output switch and may control the output switch.

Systems and techniques are provided for a power receiver circuit. A power generating mechanism may include power generating elements that may generate alternating current signals. Rectifier circuit may include rectifiers that may generate a direct current signal from an alternating current signal, and diodes. Group circuits that may connect groups of rectifier circuits in electrical circuits to combine the direct current signals from the rectifier circuits in a group into a single direct current signal. A step down converter may be connected to the group circuits. The step down converter may convert a direct current signal to a direct current signal of a target voltage level. An output switch may be connected to the step down converter. A linear regulator may be connected to the step down converter. A microcontroller may be connected to the linear regulator and the output switch and may control the output switch.

A wireless power transmission device radiating electromagnetic waves is disclosed. The wireless power transmission device can comprise: a first circuit board; a first conductive member mounted on a first surface of the first circuit board; a first ground member mounted on a second surface facing opposite from the first surface; and an electrical circuit disposed on a position, on the second surface of the first circuit board, which does not overlap the first ground member and for controlling the radiation of electromagnetic waves from the first circuit board.