A system includes: a power transmission coil in each of power supply spaces where electric vehicles can park in line one behind another from a head side to a tail side of the power supply spaces, and a power supply circuit supplying power to the electric vehicle via the power transmission coil when the power transmission coil faces a power reception coil in the electric vehicle. The system further includes: a controller making the electric vehicles park in line one behind another from the head side, moving one electric vehicle parked in a leading power supply space of the power supply spaces to a boarding area after stopping the power supply to the one electric vehicle, and moving another electric vehicle located behind the one electric vehicle to a power supply space at the head side.

A method of detecting a wirelessly powered vehicle on a roadway uses detection of induced voltages or currents in coils provided in the roadway. Once the vehicle has been detected the appropriate coils can be energised to power the vehicle.

A method of detecting a wirelessly powered vehicle on a roadway uses detection of induced voltages or currents in coils provided in the roadway. Once the vehicle has been detected the appropriate coils can be energised to power the vehicle.

A power transmission device includes a power transmission coil, a magnetically shielded space created by a power transmission-side cancel coil arranged outside the power transmission coil, a moving member configured to move a metal foreign substance, and a moving mechanism configured to move a part or all of an upper surface of the moving member from an area outside the magnetically shielded space into the magnetically shielded space.

Embodiments are disclosed of a transportation pathway in the form of a road (10), which comprises a pavement sub-base material (12) located at surrounding ground (14), which has a layer which includes a conductive material. In one example, the layer is located on an uppermost surface (16) of the pavement sub-base (12). In the embodiment shown, the conductive material is in the form of a layer of asphalt (18) containing dispersed particulate conductive particles (20) in the form of graphene. A sufficient quantity of the conductive particles (20) is located a short depth from the uppermost road surface (22) of the asphalt layer (18), so that when the surface (22) is exposed to a primary magnetic field (28) generated by an external magnetic source positioned above the pathway, for example a powered hoverboard (24) or other vehicle, these conductive particles (20) create an induced magnetic field (26) which repels the primary magnetic field (28) being generated by the hoverboard (24). The opposing magnetic fields (26, 28) create a suspension of the hoverboard (24) above the road surface (22) known as magnetic levitation.

A wireless power reception system includes a power transmission device, a power reception device, a wheel with a rim, and a tire mounted on the rim. The tire includes a bead core and a bead filler, a tire width direction cross-sectional area S1 of the bead filler is one to eight times a tire width direction cross-sectional area S2 of the bead core, the power transmission device can transmit electric power with a frequency of 1000 kHz or less wirelessly, the power reception device is disposed farther inward in the tire radial direction than a tread portion of the tire, the power reception device receives the electric power wirelessly from the power transmission device in a state such that the power transmission device is located farther outward in the tire radial direction than the tire, and the tread portion of the tire is formed from a non-magnetic material.

A coil device according to one aspect of the present disclosure includes a coil generating a magnetic field, a casing accommodating the coil, a conductive part including an input part, an output part, and a conductive pattern connecting the input part to the output part, the conductive part being provided on the casing, and electrically insulated from the casing, and a detection part electrically connected to the input part and the output part, energizing the conductive pattern via the input part and the output part, and detecting deformation in the casing based on an energized state of the conductive pattern.

A method and system include determining a resonant frequency of a vehicle system operably coupled with an external power source that provides voltage and current to the vehicle system. A first filter extracts a phase or a frequency component from the voltage provided by the external power source to generate a stabilizing voltage component. A second filter extracts a phase or a frequency component from the current provided by the external power source to generate a stabilizing current component. The stabilizing voltage component is out of phase with the stabilizing current component. A control input of a converter device of the vehicle system is determined based on the stabilizing voltage component, the stabilizing current component, and the resonant frequency. The stabilizing voltage component, the stabilizing current component, and the control input are communicated with the converter device to change the resonant frequency of the vehicle system.

A power transmitting device includes a power transmitting coil for providing output power to a power receiving coil, a thermal sensor that detects a temperature around the power transmitting coil, and a power transmission control circuit that controls the power transmitting device. The power transmission control circuit causes the power transmitting coil to provide first output power, the power transmitting coil to provide second output power to the power receiving coil for charging a battery connected to the power receiving coil, the thermal sensor to detect the temperature around the power transmitting coil, and, if the detected temperature is equal to or higher than a threshold because of existing a metal foreign object, the power transmitting coil to reduce a level of the output power or stop the output power. The level of the first output power is lower than the level of the second output power

A power transmitting device includes a power transmitting coil for providing output power to a power receiving coil, a thermal sensor that detects a temperature around the power transmitting coil, and a power transmission control circuit that controls the power transmitting device. The power transmission control circuit causes the power transmitting coil to provide first output power, the power transmitting coil to provide second output power to the power receiving coil for charging a battery connected to the power receiving coil, the thermal sensor to detect the temperature around the power transmitting coil, and, if the detected temperature is equal to or higher than a threshold because of existing a metal foreign object, the power transmitting coil to reduce a level of the output power or stop the output power. The level of the first output power is lower than the level of the second output power