Abstract: A coil alignment method performed in a coil alignment apparatus coupled to a VA controller includes: sensing magnetic field intensities induced from a ground assembly (GA) coil through a first auxiliary coil and a second auxiliary coil which are fixedly coupled to a VA coil; comparing a first magnetic field intensity sensed through the first auxiliary coil with a second magnetic field intensity sensed through the second auxiliary coil; moving the VA coil or the GA coil to a position where there is a predetermined difference or less between the first magnetic field intensity and the second magnetic field intensity; and moving at least one of the VA coil and the GA coil in a direction facing each other, so that a center point of the VA coil and a center point of the GA coil are located within a shortest distance of each other or within a certain error range of the shortest distance, while maintaining the predetermined difference or less between the first magnetic field intensity and the second magnetic field in

Abstract: Disclosed are alignment methods and apparatuses for power transmission/reception coils in an electric vehicle wireless power transfer system. An alignment method may comprise moving a primary coil such that a reference center point of the primary coil sequentially passes through a plurality of measurement points located on the primary coil or located outside the primary coil; measuring physical quantities induced in the primary coil by a power or a magnetic field of a secondary coil magnetically coupled with the primary coil at the reference center point and the plurality of measurement points; and calculating a relative position of the primary coil with respect to the secondary coil based on the measured physical quantities.

Abstract: A coil alignment method performed in a vehicle-side coil alignment apparatus coupled to a vehicle assembly (VA) controller includes: moving a light-blocking unit protruding from a vehicle parked in a wireless charging area in a first direction toward the ground facing one side of a vehicle-side wireless power transfer pad which is mounted on the vehicle and includes a VA coil, where the light-blocking unit protrudes from the one side of the vehicle-side wireless power transfer pad; stopping movement of the light-blocking unit in response to a first stop signal from a ground assembly (GA) controller; moving the light-blocking unit in a second direction perpendicular to the first direction; and stopping movement of the light-blocking unit in response to a second stop signal from the GA controller.

Abstract: Disclosed herein are a wireless power transfer apparatus, a method for wireless power transfer and a method of detecting a resonant frequency used in a wireless power charging system or a wireless power transfer. The wireless power transfer apparatus includes a plurality of transmission coils, each of which transmits power to a receiver coil through magnetic resonance; a signal generator transmitting signals having different resonant frequencies to the plurality of transmission coils, the signal generator being connected to the plurality of transmission coils; and a feedback unit transferring information on amounts of powers which are respectively output by the plurality of transmission coils to the signal generator.

Abstract: A coil alignment method performed in a vehicle-side coil alignment apparatus coupled to a vehicle assembly (VA) controller includes: moving a light-blocking unit protruding from a vehicle parked in a wireless charging area in a first direction toward the ground facing one side of a vehicle-side wireless power transfer pad which is mounted on the vehicle and includes a VA coil, where the light-blocking unit protrudes from the one side of the vehicle-side wireless power transfer pad; stopping movement of the light-blocking unit in response to a first stop signal from a ground assembly (GA) controller; moving the light-blocking unit in a second direction perpendicular to the first direction; and stopping movement of the light-blocking unit in response to a second stop signal from the GA controller.

Abstract: A coil alignment method performed in a coil alignment apparatus coupled to a VA controller includes: sensing magnetic field intensities induced from a ground assembly (GA) coil through a first auxiliary coil and a second auxiliary coil which are fixedly coupled to a VA coil; comparing a first magnetic field intensity sensed through the first auxiliary coil with a second magnetic field intensity sensed through the second auxiliary coil; moving the VA coil or the GA coil to a position where there is a predetermined difference or less between the first magnetic field intensity and the second magnetic field intensity; and moving at least one of the VA coil and the GA coil in a direction facing each other, so that a center point of the VA coil and a center point of the GA coil are located within a shortest distance of each other or within a certain error range of the shortest distance, while maintaining the predetermined difference or less between the first magnetic field intensity and the second magnetic field in

Abstract: Disclosed are alignment methods and apparatuses for power transmission/reception coils in an electric vehicle wireless power transfer system. An alignment method may comprise moving a primary coil such that a reference center point of the primary coil sequentially passes through a plurality of measurement points located on the primary coil or located outside the primary coil; measuring physical quantities induced in the primary coil by a power or a magnetic field of a secondary coil magnetically coupled with the primary coil at the reference center point and the plurality of measurement points; and calculating a relative position of the primary coil with respect to the secondary coil based on the measured physical quantities.

Abstract: A wireless charging system for a vehicle may include: a power transmitter having a plurality of transmitting coils; and a controller configured to measure a current and a voltage of each of the plurality of transmitting coils and to apply charging power only to a subset of the plurality of transmitting coils based on a magnitude of the measured current and voltage of each of the plurality of transmitting coils.

Abstract: Disclosed herein are a wireless power transfer apparatus, a method for wireless power transfer and a method of detecting a resonant frequency used in a wireless power charging system or a wireless power transfer. The wireless power transfer apparatus includes a plurality of transmission coils, each of which transmits power to a receiver coil through magnetic resonance; a signal generator transmitting signals having different resonant frequencies to the plurality of transmission coils, the signal generator being connected to the plurality of transmission coils; and a feedback unit transferring information on amounts of powers which are respectively output by the plurality of transmission coils to the signal generator.

Abstract: A wireless charging system for a vehicle may include: a power transmitter having a plurality of transmitting coils; and a controller configured to measure a current and a voltage of each of the plurality of transmitting coils and to apply charging power only to a subset of the plurality of transmitting coils based on a magnitude of the measured current and voltage of each of the plurality of transmitting coils.

Abstract: Provided are a method of controlling a wireless power transmission system capable of controlling the wireless power transmission system in a wireless power receiving apparatus, a wireless power receiving apparatus, and a method of transmitting wireless power. The method of controlling the wireless power transmission system, which is performed on the wireless power receiving apparatus in a vehicle, includes receiving a plurality of transmission signals output from a plurality of transmission coils connected to a wireless power transmission apparatus in a charging station, in a receiving coil mounted on the vehicle, extracting power transmission efficiency for the plurality of transmission signals based on a power transmission parameter by the plurality of transmission signals, and transmitting transmission coil operation control information based on the power transmission parameter or the power transmission efficiency to the wireless power transmission apparatus.

Abstract: An error operation in a white balance circuit is prevented from occurring. This error operation occurs when a white balance control is mistakenly executed upon recognizing that a color temperature of the environment is changed during a counter light correction either when an iris is adjusted or when an amplifying gain in an amplifying stage is controlled. The counter light correcting function is executed in order to account for the fact that an object appears shaded in the vicinity of a bright background. The error operation is prevented by maintaining the white balance correction at a present state when a voltage from a counter light correction circuit becomes greater than a reference voltage.

Abstract: A circuit for a video camera for color separation and contour correction which can perform color separation and contour correction of a signal from a charge coupled device image sensor specifically utilizing two 1H (1 horizontal period) delay elements. The circuit adds a 2H delayed chrominance signal from a delay unit and a current input chrominance signal. This sum is then decreased by one-half. The circuit separates red and blue components of the chrominance signals decreased by half and from the 1H delayed chrominance signal from the delay unit. Next, vertical and horizontal contour correcting signals are generated in response to the 1H delayed chrominance signal from the delay unit and in response to the output of an amplifying unit. Thus, the present invention uses two 1H delay elements to perform color separation as well as contour correction to thereby simplify the overall circuit design.