Abstract: The present invention provides a method of tin-plating a copper alloy for electric or electronic parts and automobile parts which has excellent insertion force, heat-resistant peeling, and solderability, and a tin-plating material of a copper alloy manufactured therefrom.

Abstract: A wireless power transmitter includes: a converter including switching elements forming a bridge circuit and configured to output an alternating current (AC) voltage in response to control signals; a resonator including a resonant capacitor and a resonant coil, and configured to receive the AC voltage to transmit power wirelessly; and a controller configured to set a dead time at which a magnitude of the AC voltage is substantially zero in response to a signal received from a wireless power receiver.

Abstract: A wireless power transmitter includes: a first power transmitting unit including first switching elements forming a first bridge circuit, and configured to receive input DC voltage and transmit a first power by switching operations of the first switching elements; and a second power transmitting unit including second switching elements forming a second bridge circuit, and configured to receive the input DC voltage and transmit second power by switching operations of the second switching elements. The first power transmitting unit steps-up the input DC voltage according to a duty ratio of one or more of the first switching elements, and applies the stepped-up input DC voltage to the first bridge circuit. The second power transmitting unit steps-up or steps-down the input DC voltage according to a duty ratio of one or more of the second switching elements, and applies the stepped-up or stepped-down input DC voltage to the second bridge circuit.

Abstract: A wireless power transmitter includes a first resonance circuit having first resonance characteristics; a second resonance circuit having second resonance characteristics different from the first resonance characteristics; a first inverter configured to provide alternating current (AC) power to the first resonance circuit using an input direct current (DC) power; a second inverter configured to provide the AC power to the second resonance circuit using the input DC power; and a controller configured to control the first inverter and the second inverter to cause the first resonance circuit to wirelessly transmit power, and to cause the second resonance circuit to transmit an external object sensing signal while the first resonance circuit wirelessly transmits power.

Abstract: A wireless power transmitter includes: a power supply configured to supply a driving power; a first power transmitter including first bridge switching elements forming a first bridge circuit, and configured to receive the driving power to transmit a first power, wherein a magnitude of a first input voltage applied to the first bridge circuit is determined by a duty of at least one of the first bridge switching elements; a second power transmitter including second bridge switching elements forming a second bridge circuit, and configured to receive the driving power to transmit a second power, wherein a magnitude of a second input voltage applied to the second bridge circuit is determined by a duty of at least one of the second bridge switching elements; and a controller configured to output first and second power transmitting control signals respectively controlling the first bridge switching elements and the second bridge switching elements.

Abstract: A wireless power transmitter includes a common bridge circuit configured to apply a first alternating current (AC) voltage to a terminal of each of a first resonator and a second resonator of the resonators, a first sub-bridge circuit configured to apply a second alternating current (AC) voltage to another terminal of the first resonator while the first alternating current (AC) voltage is being applied to the terminal of the first resonator, and a second sub-bridge circuit configured to apply a third alternating current (AC) voltage to another terminal of the second resonator while the first alternating current (AC) voltage is being applied to the terminal of the first resonator.

Abstract: Provided is a carbon fiber reinforced plastic machining method using a monitoring sensor which includes the step (S10) of electrically connecting a spindle and the monitoring sensor by a computer numerical control (CNC) device, the step (S20) of determining a start position in relation to machining of the spindle and a machining finish position, and the step (S30) of controlling the movement speed and rotation speed of the spindle in accordance with the determination result.

Abstract: A sleeve type smart device comprises: a cylindrical flexible display panel which displays seamless continuous images on an outer surface thereof, and has a sleeve-shaped form of which the inside is empty; a sensing unit located at an inner surface of the flexible display panel so as to recognize an entity located inside the flexible display panel; a mode selection unit for automatically selecting an operation mode corresponding to the recognized entity; and a control unit for controlling so as to operate in the operation mode selected by the mode selection unit. Accordingly, the implementation of the seamless images is possible and one device could be used in various ways according to an installation state.

Abstract: An embodiment of the present disclosure, provides a method of optical inspection on a carbon fiber reinforced plastics (CFRP) component in which performs an inspection, by maintaining the focal distance for a surface of an object to be inspected, and making a light axis of an image device and a normal line of the surface of the object to be inspected to be identical.

Abstract: A wireless power transmitter includes a wireless power controller configured to receive an alternating current (AC) voltage, to convert the AC voltage into a direct current (DC) voltage, and to generate an induced current from the DC voltage according to a switching control for a transformer; and a resonator configured to be resonated by the induced current to wirelessly output charging power.

Abstract: A wireless power transmission device including a resonant circuit magnetically coupled to a wireless power reception device and being configured to wirelessly transmit power, an alternating current (AC) generator including switches and being configured to receive a direct current (DC) voltage and to generate an AC current, according to a switching operation of the switches, to be supplied to the resonant circuit, and a variable capacitor connected to an output terminal of the AC generator and having a first capacitance, when a load state of the wireless power reception device is provided as a full load state and a second capacitance lower than the first capacitance, when the load state is provided as a light load state.

Abstract: A wireless power transmitter includes: a converter including a first switch and a second switch, and configured to output alternating current (AC) power to an AC node between the first switch and the second switch; a common resonance capacitor connected to the AC node; and resonators connected to the common resonance capacitor, wherein each of the resonators includes a series capacitor, a resonance coil, and a sub-switch, connected to each other in series, and wherein the resonance coil is configured to transmit the power in a non-contact manner.

Abstract: A wireless power transmitter includes an inverter member comprising transistors configured to convert input power into alternating current (AC) power; a resonating member comprising a capacitor and a coil, and connected to an outer terminal of the inverter member; a controller configured to provide a switching signal to the plurality of transistors to control the inverter member; and a current limiting part configured to limit a level of a current applied to the inverter member by the input power.

Abstract: A wireless power transmitter includes: a converter including switching elements forming a bridge circuit and configured to output an alternating current (AC) voltage in response to control signals; a resonator including a resonant capacitor and a resonant coil, and configured to receive the AC voltage to transmit power wirelessly; and a controller configured to set a dead time at which a magnitude of the AC voltage is substantially zero in response to a signal received from a wireless power receiver.

Abstract: Provided is a carbon fiber reinforced plastic machining method using CAM which includes the step (S10) of determining machining grade in accordance with a machining target and the step (S20) of determining machining grade in accordance with a machining process, in which the machining grade is a processing condition which is determined in accordance with the rotational speed and the feeding speed of a spindle as a machining tool.

Abstract: Provided is a carbon fiber reinforced plastic machining method using a monitoring sensor which includes the step (S10) of electrically connecting a spindle and the monitoring sensor by a computer numerical control (CNC) device, the step (S20) of determining a start position in relation to machining of the spindle and a machining finish position, and the step (S30) of controlling the movement speed and rotation speed of the spindle in accordance with the determination result.

Abstract: A wireless power transmitter includes: a converter including switching elements forming a bridge circuit, wherein the converter is configured to output an alternating current (AC) voltage including a frequency determined according to an operating frequency of at least one switching element among the switching elements; a resonator including an inductor and a capacitor, and configured to receive the AC voltage to wirelessly transmit power; and a controller configured to output control signals controlling the switching elements so that the converter performs a first mode operation in which an operating duty cycle is fixed and the operating frequency is varied, and an operation of the converter is switched from the first mode operation to a second mode operation in which the operating frequency is fixed and the operating duty cycle is varied, in response to the operating frequency reaching a first reference frequency.

Abstract: A wireless power transmitter includes a wireless power controller configured to receive an alternating current (AC) voltage, to convert the AC voltage into a direct current (DC) voltage, and to generate an induced current from the DC voltage according to a switching control for a transformer; and a resonator configured to be resonated by the induced current to wirelessly output charging power.

Abstract: A wireless power transmitter includes a common bridge circuit configured to apply a first alternating current (AC) voltage to a terminal of each of a first resonator and a second resonator of the resonators, a first sub-bridge circuit configured to apply a second alternating current (AC) voltage to another terminal of the first resonator while the first alternating current (AC) voltage is being applied to the terminal of the first resonator, and a second sub-bridge circuit configured to apply a third alternating current (AC) voltage to another terminal of the second resonator while the first alternating current (AC) voltage is being applied to the terminal of the first resonator.

Abstract: An embodiment of the present disclosure, provides a method of optical inspection on a carbon fiber reinforced plastics (CFRP) component in which performs an inspection, by maintaining the focal distance for a surface of an object to be inspected, and making a light axis of an image device and a normal line of the surface of the object to be inspected to be identical.