A non-contact power supply system includes a power receiving unit mounted on a vehicle, a power transmitting unit which is disposed on a plane and which transmits electric power to the power receiving unit in a non-contact manner, and a housing which projects in a vertical direction from the plane and which accommodates the power transmitting unit. The housing has a height in a vertical direction which satisfies a condition that a vertical height of at least part of a gap defined by a bottom surface of the vehicle and an upper surface of the housing is less than 15 cm and equal to or more than 5 cm. Therefore, the non-contact power supply system which satisfies a standard for exposure of a human body to electromagnetic field and which is free from an occurrence of a physical contact with a bottom surface of a vehicle is provided.

When a portable electronic appliance is provided with two systems, a wireless power-feeding system and a wireless communication system, each system requires two power-receiving devices, a coil and an antenna, leading to a problem of increased electronic appliance size and cost. Wireless power feeding employs the resonance method and uses a resonance coil using the resonance method and a power-receiving coil that receives power from the resonance coil. At least one of the resonance coil and the power-receiving coil can also be used as an antenna for wireless communication. Thus, a power-receiving device that can be used for two systems, wireless power feeding and wireless communication, can be provided.

A method of wireless charging of electrical energy storage of a fixed or mobile power consumer includes the step of transmitting electrical energy from a power source to the electrical energy storage of the fixed or mobile power consumer using a controlled and frequency-adjustable electrical current converter for conversion from a power source format to a high frequency AC current format. The method includes the step of including a transmitter and a receiver with magnetic resonance coupling and a current converter for conversion from the high frequency AC current format into a current format required for normal operation of the electrical energy storage being charged. Energy transmission is arranged between the transmitter and the receiver using an electromagnetic field.

The invention relates to a system for transmitting power inductively from a transmitter (11) to a receiver (10), the receiver (10) comprising a signal generator for generating a signal, triggered by an event reflecting that the receiver intends to receive power from the transmitter, wherein said signal intends to activate said transmitter from standby mode to activated mode; and comprising a signal transmitting coil (103) for transmitting said signal to said transmitter; said transmitter (11) comprising a signal receiving coil (112); a detector (114) for detecting said signal received by the receiving coil; and a unit (115) for activating the transmitter from standby mode to activated mode upon the detection of said signal.

An embodiment of the present invention provides a wireless charging apparatus and a method, in which a reception unit can charge even when an inner coil of the reception unit and an inner coil of a transmission unit are not positioned in parallel. An embodiment of the present invention provides a wireless charging apparatus and a method including: a transmission unit that includes a first coil that generates a magnetic field when power is applied; a reception unit that includes a second coil, and that charges a battery using induced current that is induced in the second coil when the magnetic field of the first coil is generated; a position sensing unit that measures position information for the first coil and the second coil; and a conversion unit that converts a direction of the magnetic field according to the position information for the first coil and the second coil.

A converter comprises a first switch, a capacitor and a second switch connected in series between an input voltage source and an output filter, a third switch connected between a common node of the first switch and the capacitor, and a common node of the second switch and the output filter and a fourth switch connected between a common node of the capacitor and the second switch, and ground.

The invention relates to a method for transmitting analog and digital information while transmitting energy between a power transmitter (10) and a power receiver (12) which is galvanically isolated from the power transmitter, having the following steps: a) providing the analog (22a) and digital (24a) information to be transmitted; b) defining the number n.sub.AD of possible values AD.sub.i, i=1 to n.sub.AD which are possible when digitizing the analog information and defining the value range of the values AD.sub.i; c) assigning a digital value D.sub.x (in binary notation) to the digital information; d) defining a minimum number of events n.sub.min to be transmitted; e) determining a maximum number of events n.sub.max to be transmitted; f) defining a first set of values n.sub.low defined by: n.sub.low (AD.sub.i)=n.sub.min+f1(AD.sub.i), i=1 to n.sub.AD; g) defining a second set of values n.sub.low defined by: n.sub.high(ADi)=n.sub.maxf2(AD.sub.i), i=1 to n.sub.AD; h) digitizing the analog information in order to obtain a digital analog value AD.sub.x; i) determining a number of events n.sub.low(ADx)=n.sub.min+f1(AD.sub.x) for the respective digital value D.sub.x bit to be transmitted if the current digital value D.sub.x bit to be transmitted is a 0; and defining a number of events n.sub.high(AD.sub.x)=n.sub.maxf2(AD.sub.x) for the respective digital value D.sub.x bit to be transmitted if the current digital value D.sub.x bit to be transmitted is a 1 or vice versa; and j) transmitting a signal which correlates at least to the number of events determined in step i). The invention further relates to a corresponding device for carrying out the method.

Systems and methods which utilize wireless charging to initiate near field communication (NFC) pairing between mobile systems which utilize wireless charging and wireless charging base stations. Wireless signals sent by a mobile system over a wireless charging channel are used to initiate communication between an NFC reader presented in a base station and a passive NFC tag (or an active NFC tag used in a passive mode) present in the mobile system. Such feature allows the mobile system to act as an initiator for NFC communication without requiring the mobile system to be equipped with an NFC reader. A wireless power receiver of a mobile system may communicate with a wireless power transmitter of a base station using backscatter modulation. Commands of a standard wireless charging protocol may be repurposed to send a request for initiation of an NFC session from a mobile system to a base station.

An electrically conductive material configured having at least one opening of various unlimited geometries extending through its thickness is provided. The opening is designed to modify eddy currents that form within the surface of the material from interaction with magnetic fields that allow for wireless energy transfer therethrough. The opening may be configured as a cut-out, a slit or combination thereof that extends through the thickness of the electrically conductive material. The electrically conductive material is configured with the cut-out and/or slit pattern positioned adjacent to an antenna configured to receive or transmit electrical energy wirelessly through near-field magnetic coupling (NFMC). A magnetic field shielding material, such as a ferrite, may also be positioned adjacent to the antenna. Such magnetic shielding materials may be used to strategically block eddy currents from electrical components and circuitry located within a device.

An electrically conductive material configured having at least one opening of various unlimited geometries extending through its thickness is provided. The opening is designed to modify eddy currents that form within the surface of the material from interaction with magnetic fields that allow for wireless energy transfer therethrough. The opening may be configured as a cut-out, a slit or combination thereof that extends through the thickness of the electrically conductive material. The electrically conductive material is configured with the cut-out and/or slit pattern positioned adjacent to an antenna configured to receive or transmit electrical energy wirelessly through near-field magnetic coupling (NFMC). A magnetic field shielding material, such as a ferrite, may also be positioned adjacent to the antenna. Such magnetic shielding materials may be used to strategically block eddy currents from electrical components and circuitry located within a device.