Patent application number | Description | Published |
20110316553 | ABNORMALITY DETECTION SYSTEM - The abnormality detection system is provided for detecting an abnormality of an object. The abnormality detection system includes a high-frequency power source, a primary coil, a secondary coil and a controller. The high-frequency power source supplies power. The primary coil receives the power supplied from the high-frequency power source. The secondary coil is mounted to the object in noncontact with the primary coil for receiving power supplied from the primary coil. The controller is operable to detect the power received by the secondary coil and also to determine whether or not an abnormality is present in the object based on the detected power. | 12-29-2011 |
20120306265 | POWER FEEDING DEVICE AND VEHICLE POWER FEEDING SYSTEM - A power feeding device includes a network analyzer that measures measurement of S-parameters of a resonant system that includes an electromagnetic induction coil and a resonance coil, and an electronic control unit (ECU). The ECU adjusts the resonant frequency of the resonance coils to the power supply frequency in accordance with the measured S-parameters. Specifically, the ECU controls variable capacitors to adjust the resonant frequency of resonance coils and, after adjusting the resonant frequency, controls an impedance matching device to match the input impedance of the resonant system with the impedance on a high-frequency power supply device side viewed from the input port of the resonant system. | 12-06-2012 |
20150028804 | CONTACTLESS POWER TRANSMISSION DEVICE - A contactless power transmission device includes a switching unit that switches a power transmission line so that a first power is transmitted through the first line when an AC power supply outputs a first AC power and so that a second power is transmitted through a second line when the AC power supply outputs a second AC power. An impedance conversion unit is arranged on the second line that converts an impedance from an output of the AC power supply to a variable load when the second power is transmitted through the second line to approach an impedance from the output of the AC power supply to the variable load when the first power is transmitted through the first line. | 01-29-2015 |
20150200547 | POWER-RECEIVING DEVICE AND POWER TRANSMISSION SYSTEM - A power-receiving device includes a secondary-side coil which can receive a first alternating current power without contact from a power-sending device having a primary side coil into which first alternating current power is input. The power-receiving device comprises a first power transmission path, a second power transmission path, a common path positioned in common with the first and second power transmission paths, and a voltage regulator arranged on the common path. The voltage regulator rectifies the first alternating current power received by the secondary coil or the second alternating current power from a connecting portion, converts the rectified power to a predetermined specific voltage value, and outputs the power. | 07-16-2015 |
20150229132 | POWER RECEIVING DEVICE AND WIRELESS POWER TRANSFER DEVICE - A power-receiving device includes a secondary coil, which wirelessly receives AC power from a power-supply device having a primary coil, a variable load, in which an impedance changes in accordance with the power value of the input power, a PFC circuit having a first switching element, and a DC/DC converter having a second switching element. The PFC circuit rectifies the AC power received by the secondary coil and improves the power factor by adjusting the duty cycle in switching operation of the first switching element in accordance with the impedance fluctuation of the variable load. The DC/DC converter is configured to convert the voltage of the DC power to a different voltage and output the converted voltage to the variable load, and to adjust the duty cycle in switching operation of the second switching element in accordance with the impedance fluctuation of the variable load. | 08-13-2015 |
20150251545 | POWER RECEIVING DEVICE AND WIRELESS POWER TRANSFER APPARATUS - A power receiving device receives alternating current power in a wireless manner from a power supply device including a primary coil that receives the alternating current power. The power receiving device includes a secondary coil, a variable load, a first impedance conversion unit, a second impedance conversion unit, a fixed load, and a switch. The switch switches an output destination, to which the alternating current power received by the secondary coil is output from the first impedance conversion unit, to the fixed load or to the second impedance conversion unit and the variable load. | 09-10-2015 |
20150255991 | POWER RECEIVING DEVICE, POWER SUPPLY DEVICE, AND WIRELESS POWER TRANSFER APPARATUS - A power receiving device receives alternating current power in a wireless manner from a power supply device including an alternating current power supply and a primary coil. The power receiving device includes a secondary coil, a variable load, an impedance conversion unit, and an acknowledgement unit. Under a situation in which the acknowledgement unit acknowledges that the value of the alternating current power output from the alternating current power supply is unvaried, the impedance of the impedance conversion unit is variably controlled when an electrical property that is dependent on a relative position of the primary coil and the secondary coil varies. | 09-10-2015 |
20150280449 | Power Supply Device and Wireless Power Transfer Device - A power supply device is capable of transferring AC power in a noncontact manner to a secondary coil of a power receiving device. The power supply device includes an AC power supply that outputs the AC power. The AC power supply includes a DC/AC conversion unit that converts DC power to the AC power, which has a predetermined frequency. A primary coil receives the AC power. A control unit controls the AC power output from the AC power supply. The control unit is configured to suspend the output of the AC power from the AC power supply or decrease the AC power based on input power, input current value, output power, or output current value of the DC/AC conversion unit and a power factor or a current difference of the input current value and the output current value. | 10-01-2015 |