Lg Innotek Co., Ltd.

Scramoge Technology Limited

Su Ho Bae

Dong Ho Yong

Ki Min Lee

Jong Heon Lee

Do Hyun Won

Yu Ri Park

Woo Kil Jung

Hyoung Rae Kim

A zero voltage switching circuit includes a zero voltage switching unit which forms a full-bridge circuit at the primary side of a converter and comprises a plurality of switches for zero voltage switching; an adjustable inductor which performs zero voltage switching in resonance with a parasitic capacitor of the zero voltage switching unit, and is adjusted according to control of a control unit; and the control unit which controls inductance of the adjustable inductor according to an input voltage of the zero voltage switching unit or an electric current flowing in the adjustable inductor.

Zero voltage switching circuit and converter comprising same

Disclosed are a wireless power transmitting apparatus and a method thereof. The wireless power transmitting apparatus wirelessly transmits power to a wireless power receiving apparatus. The wireless power transmitting apparatus detects a wireless power transmission state between the wireless power transmitting apparatus and the wireless power receiving apparatus, and generates a control signal to control transmit power based on the detected wireless power transmission state. The wireless power transmitting apparatus generates the transmit power by using first DC power based on the control signal, and transmits the transmit power to a transmission resonance coil through a transmission induction coil unit based on an electromagnetic induction scheme.

Wireless power transmitting apparatus and method thereof

The present invention relates to a wireless power transmission method and apparatus therefor. A wireless power transmitter according to an embodiment may comprise: a plurality of transmission coils; an alternating current power generator for generating a plurality of alternating current power signals applied to the plurality of transmission coils; a power source for supplying direct current power to the alternating current power generator; and a controller for controlling the phases of the plurality of alternating current power signals, wherein the controller changes the phase of at least one of the plurality of alternating current power signals to control transmission power output through the plurality of transmission coils. Therefore, the present invention provides an advantage in that a wireless power transmitter including a plurality of transmission coils can more precisely control wireless power.

Wireless power control method and apparatus

A wireless power control method in a wireless power transmission device for wirelessly transmitting power to a wireless power reception device. The method includes receiving a first control signal from the wireless power reception device at a first time interval; sensing a current within the wireless power transmission device to generate a second control signal at a second time interval; and controlling a wireless power based on the first control signal and the second control signal, and in which the first time interval is longer than the second time interval.

Wireless power control method and device

An electromagnetic resonance-type wireless power transmitter according to one embodiment of the present invention may comprise: a power conversion unit including a converter capable of converting a voltage received from a power supply unit into a particular voltage; a power transmission unit including a wireless power transmission coil for receiving the particular voltage from the power conversion unit and wirelessly transmitting power, using a particular resonance frequency; a communication unit capable of performing data communication with a wireless power receiver; and a control unit for controlling the power conversion unit, the power transmission unit, and the communication unit, wherein the wireless power transmission coil may comprise an outer coil part having a first loop shape, and an inner coil part disposed within the first loop shape and having a second loop shape, the direction of a current flowing through the outer coil part may be opposite to that of a current flowing through the inner coil part adjacent to the outer coil part, and the direction of a magnetic field generated by the outer coil part may be identical to that of a magnetic field generated by the inner coil part in a first area between the outer coil part and the inner coil part adjacent to the outer coil part.

Shape of wireless power transmission coil and coil configuration method

A wireless power transmission apparatus can include a coil unit including a first layer including a first wireless power transmission coil having an asymmetric shape, and a second layer including a second wireless power transmission coil having an asymmetric shape, the first and second wireless power transmission coils being connected in parallel and partially overlapping with each other; and first and second terminals configured to simultaneously apply current to the first and second wireless power transmission coils connected in parallel, in which the first wireless power transmission coil and the second wireless power transmission coil have line symmetry with respect to an imaginary line extending between the first and second terminals and between the first and second layers.

Wireless power transmission apparatus

A mouse pad includes a wireless power transmission apparatus including at least a first transmission coil and a second transmission coil and configured to wirelessly transmit power to a mouse placed on the mouse pad; and a controller configured to directly receive determination information for selecting one transmission coil among the first transmission coil and the second transmission coil according to a movement of the mouse on the mouse pad from a power supply connected to the mouse pad, and enable the second transmission coil and disable the first transmission coil when the movement of the mouse indicates the mouse is moving on the mouse pad from the first transmission coil to the second transmission coil.

Mouse pad comprising wireless power transmission apparatus and mouse

Disclosed are a wireless power transmitter and a method of controlling power thereof. A wireless power transmitter includes a power supply device to supply AC power to the wireless power transmitter; and a transmission coil to transmit the AC power to a reception coil of a wireless power receiver by resonance. The wireless power transmitter controls transmission power to be transmitted to the wireless power receiver based on a coupling state between the transmission coil and the reception coil.

Wireless power transmitter and method of controlling power thereof

A method of supplying power in a wireless power receiver can include receiving an AC power via a reception coil in the wireless power receiver; rectifying the AC power to a DC power; transferring the DC power to a load during a charging mode when a voltage of the DC power is equal to or greater than a first threshold voltage corresponding to a target charging power for charging the load; and when the DC power being transferred to the load is less than the target charging power, maintaining the load in the charging mode while the voltage of the DC power is equal to or greater than a second threshold voltage in a state of the charging mode, in which the first threshold voltage is greater than the second threshold voltage.

Wireless power receiver with improved power transmission efficiency and power control method thereof

The present invention relates to a method for identifying a wireless power receiver and devices therefor. According to an embodiment of the present invention, a wireless power transmission device for transmitting power wirelessly to a wireless power reception device may comprise: a power conversion unit for converting, to a specific direct current power, a direct current power received from a power supply unit; and a feedback circuit for controlling an output voltage of the power conversion unit so that intensity of current that is input to the power conversion unit is maintained constant. Therefore, the present invention is advantageous in that the present invention enables transmission of appropriate power to a wireless power receiver even in a situation where a coupling coefficient between transmission/reception coils changes abruptly.

The present invention relates to a wireless charging system using a wireless charging system, and a device therefor. A wireless power receiving device according to one embodiment of the present invention may comprise: first to Nreceiving coils disposed to be partially overlapped on the same plane so as to receive wireless power signals; first to Noutput terminals formed to enable both ends of each of the first to Nreceiving coils to be connected thereto so as to transfer alternating current power induced by at least any one among the first to Nreceiving coils; and a rectifier for converting, into direct current power, the alternating current power to be input from the first to Noutput terminals. Therefore, the present invention has an advantage of minimizing charging interruptions and minimizing manufacturing costs of a wireless power transmitting device.

Wireless charging system and device therefor

A method of supplying power in a wireless power receiver can include receiving an AC power via a reception coil in the wireless power receiver; rectifying the AC power to a DC power; entering a charging mode by transferring the DC power to a load when a voltage of the DC power is equal to or greater than a first threshold voltage; and maintaining the load in the charging mode when the voltage of the DC power is equal to or greater than a second threshold voltage in a state of the charging mode, in which the first threshold voltage is greater than the second threshold voltage.

A wireless power receiver for transferring a power received from a wireless power transmitter to a load, the wireless power receiver including a receiving coil configured to receive an AC power from the wireless power transmitter, a rectifier configured to rectify the AC power into a DC power and a controller configured to monitor a DC voltage at an output of the rectifier, in which the wireless power receiver transceives information with the wireless power transmitter through an in-band communication, and the controller creates a control signal to adjust the AC power received from the wireless power transmitter and continuously is configured to charge the load when a charging state is changed.

Growing community of inventors

Seoul, South Korea

Su Ho Bae