A contactless power supply system includes a first power transmission coil, a plug power reception coil, a plug power transmission coil, and a first power reception coil. The first power transmission coil and the plug power reception coil are configured to satisfy a relational equation of (L.sub.2a/L.sub.1).sup.1/2=G1/K1=N.sub.2a/N.sub.1, where L.sub.1 represents a self-inductance of the first power transmission coil, L.sub.2a represents a self-inductance of the plug power reception coil, N.sub.1 represents a winding number of the first power transmission coil, N.sub.2a represents a winding number of the plug power reception coil, K1 represents a coupling coefficient of the first power transmission coil and the plug power reception coil, and G1 represents a voltage conversion gain of the voltage applied to the plug power transmission coil relative to the voltage applied to the first power transmission coil.

A wireless electrical energy transmission system is provided. The system comprises a wireless transmission base configured to wirelessly transmit electrical energy or data via near field magnetic coupling to a receiving antenna configured within an electronic device. The wireless electrical energy transmission system is configured with at least one transmitting antenna and a transmitting electrical circuit positioned within the transmission base. The transmission base is configured so that at least one electronic device can be wirelessly electrically charged or powered by positioning the at least one device external and adjacent to the transmission base.

A wireless electrical energy transmission system is provided. The system comprises a wireless transmission base configured to wirelessly transmit electrical energy or data via near field magnetic coupling to a receiving antenna configured within an electronic device. The wireless electrical energy transmission system is configured with at least one transmitting antenna and a transmitting electrical circuit positioned within the transmission base. The transmission base is configured so that at least one electronic device can be wirelessly electrically charged or powered by positioning the at least one device external and adjacent to the transmission base.

A method and an apparatus for wireless charging of batteries of electronic accessing devices. A method includes establishing a first connection between a battery of an accessing device and a receiver and a second connection between the accessing device and a transmitter, the transmitter and the receiver being associated with each other. The method further includes determining a charging status of the battery of the accessing device and communicating the charging status of the battery to the transmitter on determining that the charging status of the battery reaches below a predefined threshold value via the second connection. The method also includes charging the battery of the accessing device with power from the receiver using the first connection, wherein the receiver receives the power from the transmitter over the air.

A method and an apparatus for wireless charging of batteries of electronic accessing devices. A method includes establishing a first connection between a battery of an accessing device and a receiver and a second connection between the accessing device and a transmitter, the transmitter and the receiver being associated with each other. The method further includes determining a charging status of the battery of the accessing device and communicating the charging status of the battery to the transmitter on determining that the charging status of the battery reaches below a predefined threshold value via the second connection. The method also includes charging the battery of the accessing device with power from the receiver using the first connection, wherein the receiver receives the power from the transmitter over the air.

A wireless power transmission system, and a method for controlling wireless power transmission and wireless power reception are provided. According to an aspect, a method for controlling a wireless power transmission may include: detecting a plurality of target devices used to wirelessly receive power; selecting a source resonating unit from among a plurality of source resonating units, based on the amount of power to be transmitted to one or more of the plurality of target devices, a coupling factor associated with one or more of the plurality of target devices, or both; and wirelessly transmitting power to a target device using the selected source resonating unit.

Provided is a device and method for wirelessly transmitting power, and a wireless power transmission device that may control an electrical connection between a power charger and a transmitter to charge a source resonator with power and transmit the charged power to a target resonator through mutual resonance.

A method of configuring a metamaterial structure comprising a plurality of electrical resonators (110) that support magnetoinductive waves is disclosed. The method comprises: powering at least one of the electrical resonators (110) with an alternating current at an excitation frequency, the at least one powered electrical resonator providing a source of magnetoinductive waves in the structure; adjusting parameters of the metamaterial structure to create constructive interference of one- two- or three-dimensional magnetoinductive waves at one or more target resonators of the electrical resonators (110), to improve power transfer from the at least one powered electrical resonator to the one or more target resonators (110).

A compact surveillance system (CSS) includes a power input configured to provide power to the system; one or more sensors configured to measure a measurand; a receiver configured to receive an external signal; and a processor configured to generate information, the processor being in electrical communication with: the one or more sensors; an information storage device configured to store the information; a source transducer configured to transfer the information; wherein the information is generated based on the measurand so as to reduce a transfer energy.

Embodiments of the present application provide a wireless energy transmission method and device. A method includes: generating a visible light communication signal according to wireless energy transmission intensity between a wireless energy sending device and a wireless energy receiving device; and sending the visible light communication signal. A signal can be transmitted (or received) related to wireless energy transmission intensity through visible light communication, to enable a user to easily obtain information about wireless energy transmission intensity.