Abstract: A bidirectional DC-DC converter includes a first circuit that is configured to process a first voltage being a DC voltage and that includes a first electronic component including a first switching element; a second circuit that is configured to process a second voltage or a third voltage, the second voltage being a DC voltage supplied to an electric vehicle, the third voltage being a DC voltage generated in an electric vehicle, and that includes a second electric component with a lower withstand voltage than the first electronic component, the second electric component including a second switching element; and a control circuit configured to control switching of at least one of the first switching element and the second switching element wherein the bidirectional DC-DC converter is configured to convert the first voltage into the second voltage or convert the third voltage into the first voltage.

Abstract: Provided is a method for manufacturing a wireless power-transmitting device including a power-transmitter having a transmission coil, and a power-receiver having a reception coil.

Abstract: A wireless power-supplying system includes a power-transmitting coil provided on the ground and a power-receiving coil provided above the power-transmitting coil and wirelessly supplies electric power from the power-transmitting coil to the power-receiving coil. The wireless power-supplying system further includes a flexible cover provided so as to cover the power-transmitting coil and configured to be inflated to occupy a space between the power-transmitting coil and the power-receiving coil. During the inflation of the flexible cover, the flexible cover assumes a specific shape capable of removing a foreign object laid thereon before occupying the space between the power-transmitting coil and the power-receiving coil.

Abstract: A power transmitter includes a power converter that converts power fed from a power source into first DC power, an inverter circuit that converts the first DC power into first AC power, a power transmission coil that generates a magnetic field based on the first AC power, and is magnetically coupled with a power reception coil included in the power receiver, a sensor that detects a current and a voltage of the first DC power, and a controller that controls the power converter, wherein the controller controls the power converter to raise a voltage of the first DC power up to a first voltage lower than a predetermined power feeding time voltage predetermined, and determines whether power is not allowed to be fed to the power receiver based on the current of the first DC power when the voltage of the first DC power is the first voltage.

Abstract: A wireless power supply system includes a power supply coil installed on the ground, an inner balloon in which a power supply coil is mounted and configured to expand and contract to adjust a vertical position of the power supply coil, and an outer balloon provided to cover both the power supply coil and the inner balloon and configured to expand to occupy a space between the power supply coil and a power receiving coil, and wirelessly supplies power from the power supply coil to the power receiving coil.

Abstract: The power transmission system includes a power transmitting device that transmits AC power and a power receiving device that receives the AC power. The power receiving device includes a rectifier that converts the received AC power into DC power, a DC converter that performs DC conversion on the DC power output from the rectifier, and a power-receiving side controller that calculates, based on an input voltage of the DC converter, a current command value making input impedance of the DC converter equal to a preset value and controls the DC converter so that an input current of the DC converter equals the current command value.

Abstract: A wireless power supply system includes a power supply coil installed on the ground, an inner balloon in which a power supply coil is mounted and configured to expand and contract to adjust a vertical position of the power supply coil, and an outer balloon provided to cover both the power supply coil and the inner balloon and configured to expand to occupy a space between the power supply coil and a power receiving coil, and wirelessly supplies power from the power supply coil to the power receiving coil.

Abstract: A shield apparatus is used during wireless power supply from a power-transmitting coil to a power-receiving coil of a vehicle, and includes a multilayer magnetic shield member installed around the power-transmitting coil and arranged so as to surround a space between the power-transmitting coil and the power-receiving coil during supply of electric power.

Abstract: A wireless power supply system includes a power supply coil installed on the ground, an inner balloon in which a power supply coil is mounted and configured to expand and contract to adjust a vertical position of the power supply coil, and an outer balloon provided to cover both the power supply coil and the inner balloon and configured to expand to occupy a space between the power supply coil and a power receiving coil, and wirelessly supplies power from the power supply coil to the power receiving coil.

Abstract: A wireless power-supplying system includes a power-supplying coil installed within a predefined parking space, a balloon provided to cover the power-supplying coil and configured to expand to occupy a space between the power-supplying coil and a power-receiving coil of the vehicle parked in the parking space, and fix the vehicle from below, and a power supply control unit configured to cause the balloon to fix the vehicle until payment of a usage fee of the parking space is completed when the vehicle has been fixed from below by the balloon, wherein power is wirelessly supplied from the power-supplying coil to the power-receiving coil of the vehicle in a state in which the vehicle is fixed to the balloon.

Abstract: A power-supplying coil and a wheel stopper are installed in a stop area, and distance data showing a distance in front-back direction between a power-receiving coil and a wheel of an electric vehicle is received by a receiver. Based on the distance data, as a controller controls a drive device, the wheel stopper or the power-supplying coil is moved and a distance in an approach direction between the power-supplying coil and the wheel stopper shown by distance data is made equal to the distance in the front-back direction. Accordingly, in a state in which the wheel of the electric vehicle which has entered the stop area touches the wheel stopper and stops, a position of the power-receiving coil coincides with a position of the power-supplying coil in the approach direction.

Abstract: A wireless power-supplying system includes a power-supplying coil disposed on a ground contact surface side, a power-receiving coil mounted on a movable body and to which power is wirelessly supplied from the power-supplying coil, a cover member provided in the movable body and configured to be opened and closed and cover the power-receiving coil in a closed state, and a bag configured to expand and contract and to open and close the cover member.

Abstract: The power transmission system includes a power transmitting device that transmits AC power and a power receiving device that receives the AC power. The power transmitting device includes AC converters, a power-transmitting side resonance coil, and a power-transmitting side controller. The power receiving device includes a power-receiving side resonance coil, a rectifier, a DC converter, a power-receiving side controller, and a power-source circuit.

Abstract: A wireless power-supplying system includes a power-transmitting coil provided on the ground and a power-receiving coil provided above the power-transmitting coil and wirelessly supplies electric power from the power-transmitting coil to the power-receiving coil. The wireless power-supplying system further includes a flexible cover provided so as to cover the power-transmitting coil and configured to be inflated to occupy a space between the power-transmitting coil and the power-receiving coil. During the inflation of the flexible cover, the flexible cover assumes a specific shape capable of removing a foreign object laid thereon before occupying the space between the power-transmitting coil and the power-receiving coil.

Abstract: A wireless power-supplying system includes a power-transmitting coil provided on the ground and a power-receiving coil provided above the power-transmitting coil and wirelessly supplies electric power from the power-transmitting coil to the power-receiving coil. The wireless power-supplying system further includes a flexible cover provided so as to cover the power-transmitting coil and configured to be inflated to occupy a space between the power-transmitting coil and the power-receiving coil. During the inflation of the flexible cover, the flexible cover assumes a specific shape capable of removing a foreign object laid thereon before occupying the space between the power-transmitting coil and the power-receiving coil.

Abstract: A power transmitter includes a power converter that converts power fed from a power source into first DC power, an inverter circuit that converts the first DC power into first AC power, a power transmission coil that generates a magnetic field based on the first AC power, and is magnetically coupled with a power reception coil included in the power receiver, a sensor that detects a current and a voltage of the first DC power, and a controller that controls the power converter, wherein the controller controls the power converter to raise a voltage of the first DC power up to a first voltage lower than a predetermined power feeding time voltage predetermined, and determines whether power is not allowed to be fed to the power receiver based on the current of the first DC power when the voltage of the first DC power is the first voltage.

Abstract: A power-receiving device is provided with a load circuit including a load and a switching element that are connected in series between a pair of output terminals of a power-receiving side power converter. The load of the load circuit has such a resistance value that the voltage of elements of a power-receiving side pad or the power-receiving side power converter does not reach a breakdown voltage before a power-transmission device stops power transmission to the power-receiving device after the power-receiving device and the load device are disconnected from each other.

Abstract: A power transmission system transmits power underwater between a power-transmitting device and a power-receiving device of which at least one is capable of moving freely underwater. In this power transmission system, the power-transmitting device and the power-receiving device are each provided with a resonance coil that performs the power transmission wirelessly underwater by means of magnetic field resonance. At least one of the power-transmitting device and the power-receiving device is provided with a balloon that internally houses the resonance coil of its own device.

Abstract: A shield apparatus is used during wireless power supply from a power-transmitting coil to a power-receiving coil of a vehicle, and includes a multilayer magnetic shield member installed around the power-transmitting coil and arranged so as to surround a space between the power-transmitting coil and the power-receiving coil during supply of electric power.

Abstract: Provided is a method for manufacturing a wireless power-transmitting device including a power-transmitter having a transmission coil, and a power-receiver having a reception coil.