Abstract: A power transmitter includes: a first resonator configured to wirelessly supply power to a power receiver and having an impedance that changes in response to a foreign material being proximate to the power transmitter; a second resonator having an impedance that changes in response to the foreign material being proximate to the power receiver; and controller configured to select either one of the first resonator and the second resonator in response to a wireless charging control, and to determine whether the foreign material is proximate to the power transmitter, based on a change in the impedance of the selected one of the first resonator and the second resonator.

Abstract: There are provided a non-contact power supply device and a non-contact power supply method, in which a short beacon is transmitted to recognize a power receiving device, a long beacon is transmitted to wake-up a communications circuit of the power receiving device, and charging power is transmitted in a contactless manner, wherein at least one of signal levels of the short beacon and signal levels of the long beacon is varied.

Abstract: A non-contact type power supplying apparatus may be capable of detecting another power receiving apparatus even during the charging. The non-contact type power supplying apparatus may include: a first output unit outputting a detection signal detecting a power receiving apparatus; and a second output unit outputting a wake-up signal waking-up a communications circuit of the detected power receiving apparatus when the power receiving apparatus is detected, thereby making it possible to supply power to the detected power receiving apparatus using a non-contact type method.

Abstract: A wireless power transmitting method performed in a wireless power transmitting apparatus wirelessly transmitting power includes determining reception strength of a short-range wireless communication channel, adjusting an interval of a short beacon signal in response to a change in reception strength; and transmitting the short beacon signal at the interval.

Abstract: A power transmitter includes: a first resonator configured to wirelessly supply power to a power receiver and having an impedance that changes in response to a foreign material being proximate to the power transmitter; a second resonator having an impedance that changes in response to the foreign material being proximate to the power receiver; and controller configured to select either one of the first resonator and the second resonator in response to a wireless charging control, and to determine whether the foreign material is proximate to the power transmitter, based on a change in the impedance of the selected one of the first resonator and the second resonator.

Abstract: A non-contact type power transceiving apparatus may include: a non-contact type power transmitting apparatus adjusting bias power setting a level of transmission power based on a request and transmitting one of a first power and a second power having a power level higher than that of the first power in a non-contact scheme; and a non-contact type power receiving apparatus requesting one of the first power and the second power from the non-contact type power transmitting apparatus and varying a set temperature level determining an abnormal state based on the requested power.

Abstract: A wireless power transmitting method performed in a wireless power transmitting apparatus wirelessly transmitting power includes determining reception strength of a short-range wireless communication channel, adjusting an interval of a short beacon signal in response to a change in reception strength; and transmitting the short beacon signal at the interval.

Abstract: A wireless power transmitter includes a controller configured to output a control signal in response to detected light, and a power transmitting circuit which is configured to wirelessly radiate power in response to the control signal.

Abstract: A non-contact type power transceiving apparatus may include: a non-contact type power transmitting apparatus adjusting bias power setting a level of transmission power based on a request and transmitting one of a first power and a second power having a power level higher than that of the first power in a non-contact scheme; and a non-contact type power receiving apparatus requesting one of the first power and the second power from the non-contact type power transmitting apparatus and varying a set temperature level determining an abnormal state based on the requested power.

Abstract: A coil device may be capable of varying the gap of a coil so that several devices may be wirelessly charged simultaneously or a single device may be wirelessly charged with concentrated power. The coil device may include: a case having a reception space and varying a charging area upon a user's selection; and a coil part, having, in the reception space of the case, a coil body formed of a wound conductor having a predetermined length. A gap of the wound conductor of the coil body varies as the charging area of the case varies.

Abstract: A coil device may be capable of varying the gap of a coil so that several devices may be wirelessly charged simultaneously or a single device may be wirelessly charged with concentrated power. The coil device may include: a case having a reception space and varying a charging area upon a user's selection; and a coil part, having, in the reception space of the case, a coil body formed of a wound conductor having a predetermined length. A gap of the wound conductor of the coil body varies as the charging area of the case varies.

Abstract: An electronic tag may include a wireless power receiving unit receiving power in a wireless power transmission scheme, a battery being charged with the power received from the wireless power receiving unit, a monitoring unit monitoring a power state of the battery, a display unit displaying information on the power state of the battery from the monitoring unit on a screen, and a first wireless communications unit wirelessly transmitting the information on the power state of the battery from the monitoring unit together with tag identification information in a first wireless communications scheme.

Abstract: There are provided a non-contact power supply device and a non-contact power supply method, in which a short beacon is transmitted to recognize a power receiving device, a long beacon is transmitted to wake-up a communications circuit of the power receiving device, and charging power is transmitted in a contactless manner, wherein at least one of signal levels of the short beacon and signal levels of the long beacon is varied.

Abstract: A non-contact type power supplying apparatus may be capable of detecting another power receiving apparatus even during the charging. The non-contact type power supplying apparatus may include: a first output unit outputting a detection signal detecting a power receiving apparatus; and a second output unit outputting a wake-up signal waking-up a communications circuit of the detected power receiving apparatus when the power receiving apparatus is detected, thereby making it possible to supply power to the detected power receiving apparatus using a non-contact type method.

Abstract: There are provided a wireless power relay apparatus capable of improving charging efficiency by relaying wireless power within a wireless charging system, and a case including the same. The wireless power relay apparatus may include: a substrate; a coil formed on the substrate; and a circuit unit including at least one electronic element and electrically connected to the coil.

Abstract: There is provided an electronic device including: a power reception unit having a plurality of power receiving coils and receiving a wireless power signal from a wireless power transmission device; a switching unit controlling an ON/OFF switching operation of the plurality of power receiving coils; and a control unit obtaining reception sensitivity of the power reception unit and controlling the switching unit based on the obtained reception sensitivity.