Wits Co., Ltd.

Industry-university Cooperation Foundation Hanyang University

Keun Soo Ha

Seung Won Park

Eun Young Shin

Dae Sik Kim

Joung Ho Son

Yun Ki Hong

Jae Hoon Kim

Mu Seon Woo

Rea Young Kim

Min Jae Ahn

Jung Ho Son

Kwang Hun Yang

A wireless power transmitter includes a converter comprising at least one switching element, and configured to generate boosted input power; a resonator and a controller. The resonator is configured to receive the boosted input power as an alternating current (AC) power, and transmit a ping signal in a detection mode for determining whether any one or both of an external object approaching and a type of the external object. The controller is configured to control the switching element, and gradually increase a duty cycle of a gate signal provided to the switching element, in the detection mode.

Wireless power transmitter

A wireless power transmitter includes a converter, a resonator, and a controller. The converter includes switching elements forming a bridge circuit, and is configured to output an alternating current (AC) voltage in response to control signals. The resonator includes a resonant capacitor and a resonant coil, and is configured to receive the AC voltage to wirelessly transmit power. The controller is configured to perform a first mode operation in which a duty of the control signals is fixed, a frequency of one of the control signals is varied and the control signals are output, and a second mode operation in which a frequency of the control signals is fixed, a duty of one of the control signals is reduced and the control signals are output.

A wireless power transmitter includes: a power transmitting coil configured to receive alternating current (AC) power applied thereto and wirelessly transmit the AC power; a sensing device configured to output one or more sensing signals having magnitudes that are variable based on an approach of an object; and a circuitry configured to determine whether an acknowledgement signal has been received from a wireless power receiver and whether a foreign object has entered a region of the wireless power transmitter based on a change in the magnitudes of the one or more sensing signals, and configured to control transmission of the AC power through the power transmitting coil based on a result of the determining of whether the acknowledgement signal has been received from the wireless power receiver and whether the foreign object has entered the region of the wireless power transmitter.

There is provided an apparatus for driving a motor including: a converter applying an input voltage to each phase winding of the motor; and a processor controlling a phase current flowing to the phase winding to which the input voltage is applied to be increased or decreased in a preset reference range and controlling phase commutation of the motor based on a change in the phase current.

Apparatus for driving motor and controlling method thereof

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Suwon-si, South Korea

Keun Soo Ha