A method for transmitting wireless power in a wireless charging system and a wireless power transmitting unit (PTU) are provided. The method for transmitting wireless power in a wireless charging system includes receiving information related to a voltage from each of a plurality of power receiving units (PRUs), identifying a voltage ratio of each of the plurality of PRUs based on the received information where the voltage ratio is a current voltage relative to a first voltage, determining a PRU among the plurality of PRUs based on the identified voltage ratio, and adjusting transmission power according to a voltage setting value of the determined PRU.

In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: an antenna configured to enable wireless communication with an external device; a charging unit configured to charge the external device by transferring power to said external device through said antenna; a detection unit configured to detect whether the external device is a passive NFC device; a controller configured to control the charging unit in dependence on an output of the detection unit, wherein said output indicates whether the external device is a passive NFC device. In accordance with a second aspect of the present disclosure, a corresponding method of operating a near field communication (NFC) device is conceived.

A polling processing unit executes a polling process for detecting a device that performs NFC communication. An NFC communication processing unit executes a communication process of performing NFC communication with a mobile device detected by the polling process. Power consumption associated with execution of the communication process is larger than power consumption associated with execution of the polling process. When authentication of the mobile device by an authentication processing unit is completed, or when the execution of the communication process continues for a prescribed time period, the NFC communication processing unit executes a stop process of stopping the communication process until the execution of the communication process is permitted.

A disclosed wireless power transmitting apparatus comprises: a plate; a transmitting coil that transmits wireless power to a cooking device disposed on the plate; a driving circuit that applies a current to the transmitting coil; a communication module that communicates with the cooking device; and a control unit that controls the driving circuit such that the wireless power is periodically transmitted on the basis of a transmission period of the wireless power determined by discharge characteristics of the cooking device when the cooking device enters a standby mode.

A wireless power transfer system includes an antenna base having a charger surface configured substantially as a concave spherical section and a first antenna comprising a spiral wire coil conforming to the charger surface of the antenna base. A target item includes an interface surface configured as a convex spherical section substantially matching the concave spherical section of the charger base. A second antenna is located within the target item and adjacent to the interface surface such that when the target item is placed in the antenna base with the interface surface mated to the charger surface, the first and second antennas are within inductive coupling range for wireless power transfer between the antennas.

An inventive rotatable optical short-range transceiver has: a support which is rotatable around a rotation axis, an optical receiver which is arranged at the support on the rotation axis to receive an optical reception signal from a first direction, an optical transmitter which is arranged at the support to be adjacent to the optical receiver to emit an optical transmission signal in a second direction, and an optical transmission/reception unit which is configured to allow interruption-free rotatable optical data communication, wherein the optical transmission/reception unit is arranged at the support above the optical receiver and extends over the optical receiver and the optical transmitter, and wherein the optical transmission/reception unit has a support structure for mounting at the support, which is implemented integrally with the optical transmission/reception unit.

The present disclosure provides a range-finding system capable of data communication. The range-finding system includes a rangefinder for acquiring ranging data, a magnetic ring unit having at least two communication channels, and a data processing and control unit. Each communication channel includes a magnetic ring. The magnetic ring unit transmits the ranging data as downlink data from the rangefinder to the data processing and control unit via one or more of the communication channels.

A mobile device includes a smartcard controller that does not rely on power received from an interrogating RF field. The mobile device also includes a small inductive device capable of inductive coupling with an RFID reader. The smartcard controller includes circuitry to modulate an impedance of a port coupled to the inductive element when in the presence of an interrogating RF field at substantially 13.56 MHz.

Systems and methods for detecting fraud. One method includes providing an input device, the input device having processing circuitry, a memory, and at least one information receiving module for receiving information associated with a user of the input device. The method also includes providing a sensor in electronic communication with the processing circuitry. The sensor has a sensor coil, and the sensor coil is disposed proximate the at least one information receiving module. Further, the method includes flowing alternating electrical current through the sensor coil to generate a magnetic field, measuring at least one electrical characteristic of the sensor, and providing first information representative of the at least one electrical characteristic to the processing circuitry. Finally, the method includes storing in the memory second information representative of at least one predetermined value of the at least one electrical characteristic and comparing the first information with the second information.

An earbud includes a housing that includes a driver assembly positioned within the housing forming a front volume in front of the driver and a back volume behind the driver. An acoustic insert is positioned behind the driver assembly and attached to an interior surface of the housing such that it forms a bass channel that is routed from the back volume to a vent in the housing.