Methods and systems for providing an asset communication system are described. One asset communication system includes an active communication subsystem including a first radio transceiver, a passive communication subsystem including a second radio transceiver configured to transmit and receive data using radio waves for communication and power, and a sensory subsystem. The sensory subsystem can include one or more sensors, for example, an ambient environment sensor. The asset communication system further includes a synchronous trigger controller for activating the active communication subsystem according to a schedule, and an asynchronous trigger controller for activating the active communication subsystem based on a signal received from a sensor or the second radio transceiver.

The present disclosure relates to a detection method or device, by a first NFC device generating an electromagnetic field for recharging a battery of a second NFC device, of a disruptive condition, in which thresholds (MHTH, MLTH, PHTH, PLTH) for detection of a variation of the field are adjusted in real time during the recharging.

The present invention discloses a current phase locking and driver pulse generation method for wireless charging for electric vehicles. By monitoring the resonant current i.sub.L2 of the receiving coil, the proposed method generates the synchronization signal accurately based on the phase of the current i.sub.L2. Moreover, it controls the phases of driver pulses of switching transistors according to the synchronization signal so as to control the turn-on moment and turn-off moment of the switching transistors in the secondary rectifier. As a result, by using the proposed method, the pulse losing of the switching transistors in the secondary active rectifier can be avoided; the stable and reliable phase locking of the high-frequency resonant current and generation of driver pulses can be achieved; the anti-interference capability can be greatly enhanced, and the stability and reliability of the wireless charging system for electric vehicles can also be improved.

A rectifying circuit (10, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6) comprising a first circuit branch (20) and a second circuit branch (30) in parallel between an output node (Out) and a reference node (GND), each circuit branch (20, 30) comprising an inductive element (L1, L2) in series with an electric current controlling element (23, 33) and an input node (In1, In2) arranged between the inductive element (L1, L2) and the electric current controlling element (23, 33), a voltage that is variable over time being applied between the input nodes (In1, In2) during the operation of the rectifying circuit.

An interactive poster includes one or more first near-field communications (NFC) antennas, a memory to store first content, and a controller control operation of a display. The NFC antennas may be located at predetermined positions, and the controller changes display of first content to second content when one or more of the antennas are tapped by a user device including an NFC circuit.

Concepts and technologies directed to wireless power transfer network management are disclosed herein. Embodiments of a system can include an optical beamforming transmitter, a processor, and a memory that stores computer-executable instructions that configure a processor to perform operations. The operations can include receiving a power charge message that requests wireless power transfer to charge a battery system of a wirelessly chargeable equipment. The operations can include detecting that the wirelessly chargeable equipment is within a power transfer range of the optical beamforming transmitter. The operations can include determining that the wirelessly chargeable equipment is not stationary. The operations can include tracking movement of the wirelessly chargeable equipment and activating the optical beamforming transmitter that provides wireless power transfer to the wirelessly chargeable equipment while the wirelessly chargeable equipment is within the power transfer range.

Provided is a wireless power transfer antenna core. In the wireless power transfer antenna core according to an exemplary embodiment of the present invention, a conductive member configured to serve as an antenna for transmitting or receiving wireless power is wound multiple times along a longitudinal direction. The wireless power transfer antenna core is made of a magnetic body and comprises: a first portion having a first cross-sectional area; and a second portion extending with a predetermined length from an end of the first portion and second cross-sectional area that is relatively larger than the first cross-sectional area, wherein the conductive member is wound multiple times on the first portion.

A method and device for wireless power transfer provide the ability for concurrent power transfer on two widely separated bands. A wireless power transmitting device includes two coils respectively configured for transmission at two separate wireless power transmission frequencies. A dedicated current or voltage driver is provided for each of said two coils. A controller causes the current or voltage drivers to selectively or concurrently generate an AC magnetic field at either of the frequencies or both frequencies. A method includes concurrently driving two coils arranged with respect to each other to reduce losses at two separate wireless power transmission frequencies while suppressing eddy currents in the path of one of the two coils.

A power transmission device includes a communication unit that transmits a power capability information transmission request via a communication channel and receives power capability information in response to the power capability information transmission request. The power transmission device also includes a processing unit that sets a parameter based on the power capability information. Further, the power transmission device includes a power transmission unit that wirelessly transmits power using the parameter. The communication unit transmits the power capability information transmission request before the power transmission unit wirelessly transmits the power.

An inductive power transfer system is arranged to transfer power from a power transmitter to a power receiver via a wireless power signal. The system supports communication from the power transmitter to the power receiver based on load modulation of the power signal. The power receiver transmitting a first message to the power transmitter which comprises a standby power signal requirement for the power signal during a standby phase. The power transmitter receives the message, and when the system enters the standby phase, the power transmitter provides the power signal in accordance with the standby power signal requirement during. A power receiver configurable standby phase is provided which may for example allow devices to maintain battery charge or to provide fast initialization of the power transfer phase.