Abstract: 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.

Abstract: This power transfer device is provided with an alternating current power supply, primary-side coil, control unit, control power supply, and switch. The alternating current power supply has a first converter that converts external power into first direct current power and a second converter that outputs power by converting direct current power into alternating current power at a predetermined frequency. The second converter outputs, as alternating current power, first alternating current power in the cases where the first direct current power is inputted from the first converter, and outputs, as alternating current power, a second alternating current power having a power value smaller than that of the first alternating current power in the cases where second direct current power is inputted from the control power supply.

Abstract: A non-contact power transmission device equipped with a ground-side device and a vehicle-side device. The ground-side device has a primary-side coil to which alternating-current power is input. The vehicle-side device includes a secondary-side coil, a battery, a secondary-side matching device, and a charging device. The secondary-side coil receives alternating-current power from the primary-side coil in a non-contact manner. The secondary-side matching device is provided between the secondary-side coil and the battery, and has a predetermined fixed inductance and fixed capacitance. The charging device has a switching element that performs a switching operation with a prescribed cycle. The charging device adjusts the duty ratio of the switching operation in accordance with the impedance of a load.

Abstract: 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.

Abstract: A receiving device includes: a secondary coil capable of wirelessly receiving alternating current power; a load having an impedance that varies in accordance with a value of input power; a variable impedance conversion unit located between the secondary coil and the load; a plurality of adjusting resistors located at an output side of the variable impedance conversion unit, wherein the adjusting resistors respectively have resistances that are fixed regardless of the value of the input power and differ from each other; and a switch that switches a subject supplied with power output from the variable impedance conversion unit to one of the load and the adjusting resistors. When the impedance of the variable impedance conversion unit is variably controlled, the subject supplied with the power output from the variable impedance conversion unit is switched to one of the adjusting resistors.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A non-contact power transmission device equipped with a ground-side device and a vehicle-side device. The ground-side device has a primary-side coil to which alternating-current power is input. The vehicle-side device includes a secondary-side coil, a battery, a secondary-side matching device, and a charging device. The secondary-side coil receives alternating-current power from the primary-side coil in a non-contact manner. The secondary-side matching device is provided between the secondary-side coil and the battery, and has a predetermined fixed inductance and fixed capacitance. The charging device has a switching element that performs a switching operation with a prescribed cycle. The charging device adjusts the duty ratio of the switching operation in accordance with the impedance of a load.

Abstract: 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.

Abstract: A charging device for a vehicle includes a device-side power line communication (PLC) modem, a device-side control pilot (CPLT) signal generating circuit, a device-side CPLT signal detecting circuit and a device-side low-pass filter (LPF). The device-side PLC modem is used for PLC between the vehicle and the charging device. The device-side CPLT signal generating circuit is used for generating CPLT signals. The device-side CPLT signal detecting circuit is used for detecting the CPLT signals transmitted from the vehicle through the signal line to determine whether or not the vehicle is ready for charging and whether or not the charging is completed. The device-side LPF is connected to an input of the device-side CPLT signal detecting circuit and has such a frequency characteristics that allows the CPLT signals to pass through the device-side LPF but removes signals having frequencies in a frequency band used for PLC.