Abstract: A wireless power supply unit includes: a power transmitting coil; and a power receiving coil that wirelessly receives electric power from the power transmitting coil. One of the power transmitting coil and the power receiving coil is shaped so that, during use, a central portion thereof is located beyond an outer peripheral portion thereof, as viewed from another one of the power transmitting coil and the power receiving coil.

Abstract: A wireless power and data transmission apparatus includes an inner module and an outer module. The inner module includes: an annular-shaped first antenna disposed around an axis; and an annular-shaped first communication electrode disposed around the axis, the first communication electrode being at a different position from that of the first antenna regarding a direction along the axis. The outer module includes: an annular-shaped second antenna disposed around the axis, the second antenna performing power transmission or power reception with the first antenna via magnetic field coupling or electric field coupling; and an annular-shaped second communication electrode disposed around the axis, the second communication electrode being at a different position from that of the second antenna regarding the direction along the axis, and the second antenna performing communications with the first communication electrode via electric field coupling.

Abstract: The operation of a wireless power transmission system is to be stabilized. A wireless power supply unit includes a power transmitting module and a power receiving module. The power transmitting module includes a transmission coil to send out AC power. The power receiving module includes: a reception coil to receive from the transmission coil at least a portion of the AC power; and a compensation circuit connected to the reception coil, the compensation circuit including at least one compensation element to counteract at least a part of a leakage reactance or an excitation reactance of a coil pair including the transmission coil and the reception coil.

Abstract: In a system for wirelessly transmitting electric power and data, communication quality is improved. A transfer module is for use as a power transmitting module or a power receiving module in a wireless power/data transfer apparatus that wirelessly transmits electric power and data between a power transmitting module and a power receiving module. The transfer module includes: an antenna that performs power transmission or power reception via magnetic field coupling or electric field coupling; a differential transmission line pair to perform transmission or reception via electric field coupling; and a shielding part being located between the antenna and the differential transmission line pair to reduce electromagnetic interference between the antenna and the differential transmission line pair.

Abstract: An object is to improve the communication quality in a system for wirelessly transmitting electric power and data. A transmission module is used as a power transmitting module or a power receiving module in a wireless power data transmission device for wirelessly transferring electric power and data between the power transmitting module and the power receiving module. The transmission module includes: a coil for transmitting or receiving electric power through magnetic field coupling; a communication electrode for transmitting or receiving signals through electric field coupling; a first conductive shield that is located between the coil and the communication electrode; and a second conductive shield that is located between the coil and the first conductive shield.

Abstract: An object of the present invention is to reduce the constraints on the mounting of a wire protecting protector to a wire, while achieving a reduction in the weight of the wire protecting protector. A wire protecting protector is made of a foamed resin and is formed in a shape having a wire housing recess capable of housing a wire, and a surface of the wire protecting protector that includes an inner circumferential surface on the wire housing recess side is a surface formed through molding. Preferably, a reinforcing film is formed on at least a part of the surface of the wire protecting protector.

Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and power transmission control circuitry. The foreign substance detector performs a series of multiple processes to determine whether or not a foreign substance is present between two resonators. The power transmission control circuitry repeats a foreign substance detection period and a power transmission period alternately. The foreign substance detection period is a period in which the foreign substance detector performs one of the series of multiple processes. The power transmission period is a period in which the inverter transmits AC power. The power transmission control circuitry also causes the foreign substance detector to divide the series of multiple processes and determine whether or not the foreign substance is present as a result of performing all of the divided series of multiple processes.

Abstract: An electrodynamic apparatus includes a first arm extending in a first direction, a second arm supported by the first arm, a linear actuator that moves the second arm along the first direction with respect to the first arm, a support extending in a second direction that is different from the first direction and supporting the first arm, and a rotating mechanism that rotates the support about an axis of rotation parallel to the second direction. The first arm includes a power transmission antenna. The second arm includes a power reception antenna. The power transmission antenna supplies electric power to the power reception antenna wirelessly. In rotating the support, the linear actuator moves the center of gravity of the second arm to the axis of rotation first, and then the rotating mechanism rotates the support.

Abstract: A relay apparatus in a wireless power transmission system includes a relay power reception antenna that receives power transmission alternating current power from a power transmission power transmission antenna, a relay rectifier that converts the power transmission alternating current power into relay direct current power, a relay inverter circuit that converts the relay direct current power into relay alternating current power, and a relay power transmission antenna that wirelessly transmits the relay alternating current power. When transmitting data to the power transmission apparatus through amplitude modulation, the relay apparatus varies amplitude of voltage of the power transmission alternating current power received by the relay power reception antenna between a first amplitude and a second amplitude and performs control for eliminating a difference between a third amplitude of the relay alternating current power and a fourth amplitude of the relay alternating current power.

Abstract: A wireless power transmission system includes: a power transmitting device; a power receiving device; and a relay device. In a state where the relay side switch circuit has the relay side rectifier and the relay side load in a non-contact state, and the receiving side switch circuit has the receiving side rectifier and the receiving side load in a non-contact state, power is transmitted from the power transmitting device to the power receiving device via the relay device. After a DC voltage output from the receiving side rectifier reaching a requested voltage of the power receiving device, the receiving side switch circuit connects the receiving side rectifier to the receiving side load at a timing T2 that is different from a timing T1 at which the relay side switch circuit connects the relay side rectifier to the relay side load.

Abstract: An object detecting device includes a coil array including coils, short-circuit switches connected in parallel with the coils, an oscillator circuit that outputs, to the coils, a voltage including an alternating current component, selection switches connected between the coils and the oscillator circuit, a detecting circuit that detects an object based on a change in a physical value such as voltage, and a control circuit that opens and closes the short-circuit switches and the selection switches. When a first selection switch is closed, a first short-circuit switch, which is connected to the first selection switch, is opened. The other selection switches are opened, and the other short-circuit switches are closed.

Abstract: An object of the present invention is to reduce the constraints on the mounting of a wire protecting protector to a wire, while achieving a reduction in the weight of the wire protecting protector. A wire protecting protector is made of a foamed resin and is formed in a shape having a wire housing recess capable of housing a wire, and a surface of the wire protecting protector that includes an inner circumferential surface on the wire housing recess side is a surface formed through molding. Preferably, a reinforcing film is formed on at least a part of the surface of the wire protecting protector.

Abstract: An electrodynamic apparatus includes a first arm extending in a first direction, a second arm supported by the first arm, and a first linear actuator that is provided in the first arm or the second arm and moves the second arm along the first direction with respect to the first arm. The first arm includes a first power transmission antenna. The second arm includes a first power reception antenna. The first power transmission antenna supplies electric power to the first power reception antenna wirelessly. The first power reception antenna supplies the supplied electric power to a load electrically connected to the first power reception antenna.

Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and power transmission control circuitry. The foreign substance detector performs a series of multiple processes to determine whether or not a foreign substance is present between two resonators. The power transmission control circuitry repeats a foreign substance detection period and a power transmission period alternately. The foreign substance detection period is a period in which the foreign substance detector performs one of the series of multiple processes. The power transmission period is a period in which the inverter transmits AC power. The power transmission control circuitry also causes the foreign substance detector to divide the series of multiple processes and determine whether or not the foreign substance is present as a result of performing all of the divided series of multiple processes.

Abstract: A relay apparatus in a wireless power transmission system includes a relay power reception antenna that receives power transmission alternating current power from a power transmission power transmission antenna, a relay rectifier that converts the power transmission alternating current power into relay direct current power, a relay inverter circuit that converts the relay direct current power into relay alternating current power, and a relay power transmission antenna that wirelessly transmits the relay alternating current power. When transmitting data to the power transmission apparatus through amplitude modulation, the relay apparatus varies amplitude of voltage of the power transmission alternating current power received by the relay power reception antenna between a first amplitude and a second amplitude and performs control for eliminating a difference between a third amplitude of the relay alternating current power and a fourth amplitude of the relay alternating current power.

Abstract: A power receiving device includes a power receiving antenna that receives AC power from a power transmitting antenna, a rectifier circuit that converts the AC power into DC power, a detection circuit that detects the DC power, a load driven by the DC power, a battery that charges the DC power, a switching circuit that provides i) connection and disconnection between the rectifier circuit and the load and ii) connection and disconnection between the load and the battery, and a control circuit that controls the power receiving device. The control circuit controls the switching circuit to disconnect the rectifier circuit from the load and connect the load to the battery if the DC power is less than or equal to a power threshold value, and drive the load by the DC power charged in the battery.

Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and a power transmission control circuitry. The power transmission control circuitry causes the foreign substance detector to perform a series of multiple processes and determine whether a foreign substance is present before a transmission of first AC power starts, and then causes the inverter to start the transmission of the first AC power. After the transmission starts, a detection period in which foreign substance detecting is performed and a power transmission period in which transmission of the first AC power is performed are repeated. The series of multiple processes is divided and performed in the multiple repeated detecting periods. The foreign substance detector is caused to divide and perform the series of multiple processes using the detecting periods and determine whether a foreign substance is present.

Abstract: A wireless power transmission system includes a power transmitting device, power receiving device, and load. The power transmitting device includes an inverter circuit, power transmitting antenna, power transmission control circuit, and transmitting-side receiver. The power receiving device includes a power receiving antenna, rectifying circuit, and receiving-side transmitter. The power transmission control circuit causes the inverter circuit to output preliminary AC power to activate the power receiving device. The receiving-side transmitter transmits, to the power transmitting device, control information of the power receiving device including (i) a coupling coefficient between the power transmitting antenna and the power receiving antenna, (ii) requested voltage of the power receiving device, and (iii) load impedance of the load.

Abstract: A relay apparatus in a wireless power transmission system includes a relay power reception antenna that receives power transmission alternating current power from a power transmission power transmission antenna, a relay rectifier that converts the power transmission alternating current power into relay direct current power, a relay inverter circuit that converts the relay direct current power into relay alternating current power, and a relay power transmission antenna that wirelessly transmits the relay alternating current power. When transmitting data to the power transmission apparatus through amplitude modulation, the relay apparatus varies amplitude of voltage of the power transmission alternating current power received by the relay power reception antenna between a first amplitude and a second amplitude and performs control for eliminating a difference between a third amplitude of the relay alternating current power and a fourth amplitude of the relay alternating current power.

Abstract: A power transmitter wirelessly transmits electric power to a power receiver that includes a reception antenna. The power transmitter includes: an inverter circuit; a transmission antenna which sends out the AC power having been output from the inverter circuit; and a control circuit which, based on measurement values of voltage and current to be input to the inverter circuit, determines a value of a control parameter defining an output voltage from the inverter circuit and controls the inverter circuit by using the determined value of the control parameter. When at least one of the measurement values of voltage and current to be input to the inverter circuit changes, the control circuit changes the value of the control parameter based on the measurement values of voltage and current so that a voltage to be output from the power receiving circuit is maintained within a predetermined range.