Abstract: A source device and a method for controlling a magnetic field using two source resonators in a wireless power transmission system are provided. A device configured to control a magnetic field, includes resonators configured to form the magnetic field to transmit power to another device. The device further includes a magnetic field shape determining unit configured to determine a shape of the magnetic field. The device further includes a phase changing unit configured to change a phase of at least one of the resonators to form the magnetic field in the determined shape.

Abstract: A power converter for transmitting a resonance power is provided that includes: an input end that receives a direct current (DC) voltage of a predetermined level; a first power converter that converts the DC voltage of a predetermined level to an alternating current (AC) signal using a first switching pulse signal having substantially the same frequency as a resonant frequency; a second power converter that converts the DC voltage of a predetermined level to an AC signal using a second switching pulse signal having an opposite phase to the first switching pulse signal; a first short circuit that reduces or eliminates an odd harmonic of the AC signal outputted from the first power converter, and provides the AC signal; and a second short circuit that reduces or eliminates an odd harmonic of the AC signal outputted from the second power converter, and provides the AC signal.

Abstract: An apparatus and a method for receiving power wirelessly, and an apparatus and a method for transmitting power wirelessly are provided. The apparatus for transmitting power wirelessly includes: a source resonator configured to transmit power wirelessly to a target resonator through a mutual resonance with the target resonator; a power supply unit configured to supply power to the source resonator; and a matching unit configured to connect a passive device to the power supply unit in series or in parallel to match an output impedance of the power supply unit and an input impedance of the source resonator.

Abstract: A resonance power transmission system, and a method of controlling transmission and reception of a resonance power are provided. According to one embodiment, a method of controlling resonance power transmission in a resonance power transmitter may include: transmitting resonance power to a resonance power receiver, the resonance power having resonance frequencies which vary with respect to a plurality of time intervals; and receiving, from the resonance power receiver, information regarding the resonance frequency having the highest power transmission efficiency among the resonance frequencies used in the time intervals.

Abstract: An apparatus and method for efficiently, wirelessly transmitting a power to a plurality of target devices are provided. A wireless power transmitter may include: a source resonator configured to wirelessly transmit energy to a target device with at least one target resonator, the energy being stored in a capacitor; and a feeding unit configured to generate an induced current flowing in the source resonator in the same direction as a direction of an input current flowing in a transmission line, the feeding unit being electrically connected to the capacitor and forming a closed loop with the source resonator.

Abstract: A wireless power transmission and charging system and method are provided. The wireless power may refer to energy that may be transferred from a wireless power transmitter to a wireless power receiver. The wireless power transmission and charging system may include a source device to wirelessly transmit power, and a target device to wirelessly receive power.

Abstract: Provided is data transmission and reception that transmits and receives data using a wireless power between wireless power transmitter and a wireless power receiver. An in-band data communication apparatus using a wireless power may include a modulating unit configured to modulate data by mixing a predetermined signal and pulse signal-type data; a demodulating unit configured to detect reflected power generated due to impedance mismatching between a source resonator and a target resonator, and to demodulate received data based on a variance of the reflected power; a source resonance unit configured to transmit transmission power including the modulated data to the target resonator, and to receive the reflected power; and a controller to control the pulse signal-type data, and to control impedance matching between the source resonator and the target resonator.

Abstract: A wireless power transmission apparatus includes a measurer configured to measure a value of a current flowing in a source resonator, a communication unit configured to receive a value of a charging current of a battery from a wireless power reception apparatus, and a power controller configured to control an amount of power to be transmitted by the source resonator based on either one or both of the value of the current measured by the measurer and the value of the charging current received by the communication unit. The value of the charging current of the battery varies as the battery is charged.

Abstract: A wireless power transmission apparatus includes a resonance unit including resonators and configured to form a magnetic resonant coupling with another resonator, and a feeding unit configured to transmit alternating current (AC) power to one of the resonators. The wireless power transmission apparatus further includes a controller configured to determine a value of a capacitor connected to one of the resonators, based on a magnitude of a magnetic field formed by the resonance unit.

Abstract: A wireless power transmission system based on cell division is provided. A communication and power control method of the wireless power transmission system, includes setting a magnetic coupling zone. The method further includes detecting a target device in the magnetic coupling zone. The method further includes transmitting a power to the target device. The method further includes adjusting an amount of the power based on a transmission efficiency of the power.

Abstract: A wireless power transmission system, and a method for controlling a resonance impedance and a resonance frequency of the wireless power transmission system are provided. According to one aspect, a wireless power transmitter may include: a power generator configured to generate tracking power using a resonance frequency, the tracking power being used for a resonance frequency tracking; a source resonator configured to transmit the tracking power to a target resonator; a mismatching detector configured to detect a mismatching between the target resonator and the source resonator; and a controller configured to adjust the resonance frequency, or an impedance of a repeater resonator when the mismatching is detected, the repeater resonator being used to perform an impedance matching between the target resonator and the source resonator.

Abstract: A source device and a method for controlling a magnetic field using two source resonators in a wireless power transmission system are provided. A device configured to control a magnetic field, includes resonators configured to form the magnetic field to transmit power to another device. The device further includes a magnetic field shape determining unit configured to determine a shape of the magnetic field. The device further includes a phase changing unit configured to change a phase of at least one of the resonators to form the magnetic field in the determined shape.

Abstract: A protector that protects a rectifier, and a wireless power receiver including the protector are provided. In one embodiment, a protector for an electronic device may include: a switch configured to control current flow to a rectifier of the electronic device; and a switch controller configured to: compare, with a predetermined threshold value, a voltage difference between an output voltage of the rectifier and a voltage of the electronic device; and transmit a control signal to the switch (i) to discontinue current flow to the rectifier when the voltage difference is greater than the predetermined threshold value, and (ii) to enable current flow to rectifier when the voltage difference is less than or equal to the predetermined threshold value.

Abstract: An apparatus and method are described that may enable a target device to communicate with a source device using a wireless power. The communication apparatus receives a wireless power from a source resonator through a magnetic coupling between the source resonator and a target resonator. The communication apparatus transmits a message, and modulates the message based on the received wireless power and impedance mismatch between the source device and the target device. The communication apparatus controls the impedance mismatch by changing an impedance of the target device.

Abstract: Provided is an apparatus and method to control a resonance frequency of a device subject to wireless power transmission interference. The apparatus and method include supplying power from a printed circuit board (PCB) to an integrated circuit (IC) during exposure to a wireless power transmission environment experiencing mutual resonance. The apparatus and method also include a resonance frequency of the PCB based on a change in the supply of power.

Abstract: A wireless power transmission and charging system, and a communication method of the wireless power transmission and charging system are provided. In one embodiment, a resonance frequency control method of a wireless power transmitter may include: generating communication power used for communication in a plurality of target devices using a reference resonance frequency; transmitting communication power to the plurality of target devices; transmitting charging power to the plurality of target devices; and adjusting the reference resonance frequency based on a reflected wave of the charging power, the amount of power received by one or more of the target devices, the amount of the charging power, the transmission efficiency of the charging power, or any combination thereof.

Abstract: Provided is an apparatus and method that may stably perform wireless transmission. According to one general aspect, a power supply for a wireless power transmitter may include: a detecting unit configured to detect voltage, current, or both supplied to a power amplifier (PA); a controller configured to determine power supplied to the PA based on the detected voltage, the detected current, or both, and to determine a reference current based on the determined power supplied to the PA; and a breaker configured to cut off the power supplied to the PA based on a comparison of current supplied to the PA and the reference current.

Abstract: An apparatus and method of protecting a power receiver of a wireless power transmission system are provided. A wireless power receiver includes a rectifier comprising an input and an output, and configured to receive a signal through the input, to rectify the signal to produce a rectified signal, and to output the rectified signal through the output, and a capacitor connected to the output of the rectifier and to ground. The wireless power receiver further includes a direct current-to-direct current (DC/DC) converter connected to the output of the rectifier and to a load, and configured to convert the rectified signal to a power, and to provide the power to the load, and a device configured to create a short circuit to protect the rectifier and/or the capacitor when a voltage greater than a threshold voltage is applied to the input of the rectifier and/or the output of the rectifier.

Abstract: An apparatus and a method for wireless power reception are provided. A wireless power receiver includes a receiving unit configured to wirelessly receive a power. The wireless power receiver further includes a power consuming unit configured to consume the power, until a voltage applied to a load reaches a predetermined value, so that an amount of a power transferred from the receiving unit to the load is less than or equal to an initial accommodation power amount of the load.

Abstract: An apparatus and method for controlling a magnetic field when power is wirelessly transmitted are provided. According to one general aspect, a wireless power transmitter may include: a source resonator configured to wirelessly transmit power to a target device including at least one sub-resonator located there within; and a magnetic field distribution controller configured to control the distribution of the magnetic field within the resonator based the resonance frequency of the at least one sub-resonator and the resonance frequency of the source resonator.