Abstract: A wireless power receiver receiving power from a wireless power transmitter is provided. The receiver includes a resonance circuit, a rectifier circuit, and a driver circuit. The resonance circuit includes first and second coils and a first capacitor. The rectifier circuit includes first and second rectifier circuits. The first rectifier circuit includes first through fourth MOSFETs. Sources of the first and second MOSFETs are connected to ends of a resonator including the first coil and the first capacitor. Sources of the third and fourth MOSFETs are connected to ground. The driver circuit is connected to gates of the first through fourth MOSFETs, When the driver circuit switches off the first and second MOSFETs and switches on the third and fourth MOSFETs, as currents are induced in the resonator and the second coil, the resonance circuit receives the wireless power, and the current induced in the second coil is rectified by the second rectifier circuit.

Abstract: Disclosed is an annular resonator including a conductor formed on a surface of an annular shaped structure and having a first end and a second end opposite to the first end, and a capacitor having a first end and a second end opposite to the first end, wherein a radius of curvature of a first side facing a center portion of the annular shaped structure is smaller than a radius of curvature of a second side facing an outer periphery of the annular shaped structure, and wherein the first end and the second end of the conductor are electrically connected to the first end and the second end of the capacitor, respectively.

Abstract: According to an embodiment, an electronic device may include a battery, a resonance circuit, a rectifier, a DC/DC converter, a charger, a switch, an overvoltage protection circuit configured to perform an overvoltage protection operation or to stop the overvoltage protection operation based on the voltage at the output terminal of the rectifier, a control circuit, and a communication circuit, and the control circuit may be configured to: based on a periodic repetition of a performance of the overvoltage protection operation and a stop of the overvoltage protection while the switch is in an off state, identify a first period during which the overvoltage protection operation is stopped, based on the first period, identify an expected voltage at an output terminal of the rectifier, to be expected, wherein the expected voltage is a voltage if the switch is in an on state, based on the expected voltage, identify whether an occurrence of an overvoltage is expected if the switch is in the on state, and control the c

Abstract: An electronic device for wirelessly transmitting power may include a first resonator including a first coil, a second resonator including a second coil having a different size from the first coil, an impedance matching circuit including at least one capacitor connected through a switch, and a controller. The controller may be configured to identify which one of a first electronic device not mounted on the electronic device and a second electronic device mounted on the electronic device power is to be transmitted to. The controller may be configured to, when power is to be transmitted to the first electronic device, transmit power through the first resonator by opening the switch. The controller may be configured to, when power is to be transmitted to the second electronic device, transmit power through the second resonator by closing the switch.

Abstract: The disclosure provides a wireless power transmitting apparatus and a method for wirelessly transmitting power by the wireless power transmitting apparatus. The wireless power transmitting apparatus according to an example embodiment comprises: a power amplifier; a coil connected to the power amplifier and configured to generate an electromagnetic field based on power received from the power amplifier; an impedance sensing circuit connected between the power amplifier and the coil; at least one auxiliary coil electromagnetically coupled to the coil; and a controller, wherein the controller may be configured to: identify a change in impedance, from a signal sensed through the impedance sensing circuit, and adjust an operation setting of the at least one auxiliary coil based on the identified change in impedance.

Abstract: According to various embodiments, a method of operating a wireless power reception device may comprise: confirming information about the location of the wireless power reception device with respect to a wireless power transmission device based on a first signal received from the wireless power transmission device using at least one communication module of the wireless power reception device; confirming information about a first charging range of the wireless power transmission device based on a second signal received from the wireless power transmission device using the at least one communication module; and displaying the location of the wireless power reception device as a first icon and the first charging range as a line or a plane on a display of the wireless power reception device based on the information about the location of the wireless power reception device and the information about the first charging range of the wireless power transmission device.

Abstract: A wireless power transmitter may include a power amplifier configured to output an amplified signal based on an input signal and a driving voltage, a first LC resonant circuit connected in parallel to the power amplifier, a matching circuit, and a transmission coil connected to the matching circuit. The matching circuit may include a second LC resonant circuit including a first inductor and a first capacitor connected in series to the first inductor, and having one end connected to an output terminal of the power amplifier and one end of the first LC resonant circuit, and a second capacitor and a third capacitor respectively connected to the other end of the second LC resonant circuit. The first inductor may be configured to have an inductance value leading to an impedance of the second LC resonant circuit equal to or greater than a first predetermined magnitude at at least one second or higher harmonic frequency of an operating frequency of the input signal.

Abstract: The disclosure provides a variable wireless power transmitter including a plurality of resonators and a method of controlling the variable wireless power transmitter.

Abstract: An electronic device may include: a battery, a resonant circuit including a receiving coil, at least one capacitor and at least one switch, a rectifier circuit; a DC/DC converter, a charge control circuit; and a controller, wherein the controller may be configured to check the voltage outputted from the rectifier circuit, control the at least one switch so that the receiving coil and the at least one capacitor form a serial resonant circuit, if the voltage output from the rectifier circuit is greater than or equal to a threshold voltage, and control the at least one switch so that the receiving coil and the at least one capacitor form a parallel resonant circuit, if the voltage output from the rectifier circuit is less than the threshold voltage.

Abstract: According to various embodiments, an example wireless power transmitter may include a transistor configured to output an amplified signal based on an input signal and a driving voltage, a first capacitor coupled to the transistor in parallel, a first LC resonant circuit coupled to the transistor in parallel and including a first inductor and a second capacitor coupled to the first inductor in series, a third capacitor having a first end coupled to an output terminal of the transistor and the first LC resonant circuit, a feeding coil coupled to a second end of the third capacitor in series, and having at least a part configured to form a second LC resonant circuit with the third capacitor, and a transmission resonator including a transmission coil and a fourth capacitor coupled to the transmission coil in series.

Abstract: A wireless power transmitting device includes: a transistor configured to output a signal corresponding to a set operating frequency, based on an input signal and a driving voltage; a matching circuit connected with the transistor; a transmission coil connected with the matching circuit; an LC resonance circuit connected in parallel between the transistor and the matching circuit and configured to transfer a signal corresponding to at least one harmonic frequency of the operating frequency; and an impedance sensing circuit connected with the LC resonance circuit and configured to sense a load impedance of the wireless power transmitting device based on the signal corresponding to the at least one harmonic frequency transferred through the LC resonance circuit. The matching circuit is configured to provide impedance matching with the sensed load impedance by adjusting an impedance of the matching circuit or an impedance of the transmission coil.

Abstract: The disclosure provides a wireless power transmitting device and a method for detecting an approaching object by the wireless power transmitting device.

Abstract: An annular resonator and a wireless power transmitter are provided. The annular resonator includes upper and lower surfaces, outer and inner surfaces arranged along an annular shape, a plurality of conductors, and a plurality of capacitors connected to the plurality of conductors, respectively. Each conductor includes a first section arranged on the upper surface, a second section extending from the first section and arranged on the outer surface, a third section extending from the second section and arranged on the lower surface, and a fourth section extending from the third section and arranged on the inner surface. A first section of each of a first conductor, a second conductor, a third conductor, and a fourth conductor are sequentially arranged along the upper surface. A second section of each of the second conductor, the third conductor, the fourth conductor, and the first conductor are sequentially arranged along the outer surface.

Abstract: An electronic device may include: a resonance circuit which comprises a battery, a coil and a capacitor, and receives power wirelessly; a rectifier which rectifies AC power, provided from the resonance circuit, to DC power; a DC/DC converter which converts and outputs the DC power provided from the rectifier; a charger which charges the battery by using the converted power provided from the DC/DC converter; a first OVP circuit which selectively connects the coil to the capacitor; a second OVP circuit which is connected in parallel to the first OVP circuit; a detection circuit which detects a rectified voltage; a control circuit; and a communication circuit, wherein the control circuit, on the basis that the detected rectified voltage is equal to or greater than a first threshold voltage, controls the first OVP circuit so as to be in an off state so that the coil is not connected to the capacitor, and on the basis that the detected rectified voltage is less than a second threshold voltage, controls the first O

Abstract: According to various embodiments, a wireless power reception device for receiving wireless power from a wireless power transmission device may include a first circuit, a first rectifier circuit, a detuning circuit, and a control circuit. The first circuit may include a first coil. The first rectifier circuit may include a first switch and a second switch among a plurality of switches. The detuning circuit may include at least one detuning capacitor and at least one detuning switch. In response to a voltage at an output terminal of the first rectifier circuit exceeding a first voltage, the control circuit may be configured to form a closed loop including the first coil, the first switch, and the second switch by controlling the at least one detuning switch to an on state and controlling the first switch and the second switch to the on state.

Abstract: An electronic device includes a reception coil configured to wirelessly receive power based on an externally formed magnetic field, a rectifier configured to rectify power generated from the reception coil, an over-voltage protection circuit connected with the rectifier, and an output capacitor connected with the over-voltage protection circuit, wherein the over-voltage protection circuit includes a negative temperature coefficient thermistor (NTC) selectively connected in parallel with the rectifier and the output capacitor and a switch connecting the NTC to the rectifier and the output capacitor when a voltage at an output terminal of the rectifier exceeds a designated threshold, and disconnecting the NTC from the rectifier and the output capacitor when the voltage at the output terminal of the rectifier is less than or equal to the designated threshold.

Abstract: Disclosed is a coil including a first conductor disposed on a first plane, a second conductor disposed on a second plane different from the first plane, and including a first end electrically connected to a first end of the first conductor, and a second end positioned near a second end of the first conductor, and a third conductor disposed on the first plane, and including a first end electrically connected to the second end of the second conductor, and a second end positioned near the first end of the second conductor, wherein a pattern of the first conductor connecting the first end of the first conductor from the second end of the first conductor is in a clockwise or counterclockwise direction when the first plane is viewed from a first side, and wherein a pattern of the third conductor connecting the second end of the third conductor from the first end of the third conductor is in a direction opposite to the direction of the pattern of the first conductor when the first plane is viewed from the first side

Abstract: Disclosed is an annular resonator including a conductor formed on a surface of an annular shaped structure and having a first end and a second end opposite to the first end, and a capacitor having a first end and a second end opposite to the first end, wherein a radius of curvature of a first side facing a center portion of the annular shaped structure is smaller than a radius of curvature of a second side facing an outer periphery of the annular shaped structure, and wherein the first end and the second end of the conductor are electrically connected to the first end and the second end of the capacitor, respectively.

Abstract: Provided is an electronic device including: a battery, a resonant circuit including a coil and a capacitor configured to wirelessly receive power, a rectifying circuit configured to rectify an alternating current power provided from the resonant circuit to a direct current power, a DC/DC converter configured to convert the direct current power provided from the rectifying circuit and to output the converted direct current power, a charging circuit configured to charge the battery using the converted direct current power provided form the DC/DC converter, a controller, and a communication circuit, wherein the controller is configured to: control the charging circuit to set a magnitude of a reference current of the charging circuit to a first value, the first value being less than a maximum value of an output current of the charging circuit, control the charging circuit to set the magnitude of the reference current to a second value greater than the first value, measure a magnitude of an output current of the c

Abstract: A wireless power receiver receiving power from a wireless power transmitter is provided. The receiver includes a resonance circuit, a rectifier circuit, and a driver circuit. The resonance circuit includes first and second coils and a first capacitor. The rectifier circuit includes first and second rectifier circuits. The first rectifier circuit includes first through fourth MOSFETs. Sources of the first and second MOSFETs are connected to ends of a resonator including the first coil and the first capacitor. Sources of the third and fourth MOSFETs are connected to ground. The driver circuit is connected to gates of the first through fourth MOSFETs, When the driver circuit switches off the first and second MOSFETs and switches on the third and fourth MOSFETs, as currents are induced in the resonator and the second coil, the resonance circuit receives the wireless power, and the current induced in the second coil is rectified by the second rectifier circuit.