Abstract: A power receiving device includes plural antenna groups each including at least one antenna to receive a power transmission signal transmitted for contactless power transfer from a power transmitting device and respectively having different directivities, a transmitter that transmits a beacon signal to the power transmitting device for each of the antenna groups, a switching unit that switches to a receiving antenna group to receive the power transmission signal that is selected from the antenna groups, and a control unit that searches for the receiving antenna group for which a power value obtained by converting the power transmission signal transmitted from the power transmitting device based on the transmission of the beacon signal is not less than a predetermined threshold value, retransmits the beacon signal corresponding to the searched receiving antenna group, and charges a charging target by receiving the power transmission signal transmitted toward the receiving antenna group.

Abstract: A photovoltaic power supply device includes a base and a solar cell panel. The base is removably attached to a mobile terminal and includes a base surface (front surface). The solar cell panel is electrically connected to the base and includes a light receiving surface on an outer surface on one side in a thickness direction. Power generated by the solar cell panel is supplied to the mobile terminal via the base. The solar cell panel is supported by the base with a shaft. The position of the solar cell panel with respect to the base is variable. The position includes a retracted position in which the entirety of the solar cell panel overlaps with the base surface from the outside of the base, and a use position in which the solar cell panel does not overlap with the base surface outside the base and is tiltable about the shaft.

Abstract: A charger includes a power receiving unit, a power storage unit, and a power transmission unit. The power receiving unit is configured to receive, through wireless power supply via radio waves, power transmitted from a power transmitting device disposed in a vehicle. The power storage unit is configured to be supplied and charged with the power received by the power receiving unit. The power transmission unit is configured to transmit, through wireless power supply via electromagnetic induction, the power stored in the power storage unit to an electrical device that is to be charged.

Abstract: A wirelessly rechargeable power supply device includes a circuit board, a power storage device, two or more antennas configured to receive power, a housing that accommodates the circuit board, the power storage device, and the two or more antennas, and a charging circuit that is mounted on the circuit board and is configured to charge the power storage device with the power received by the two or more antennas. The two or more antennas include a first antenna and a second antenna. A direction in which a sensitivity of the first antenna is lowest and a direction in which a sensitivity of the second antenna is lowest are different from each other.

Abstract: A power receiving device includes a power receiving antenna, a rectifier circuit, and a bias circuit. The power receiving antenna is configured to receive radio waves for supplying power. The rectifier circuit includes a rectifier diode and is configured to convert radio waves received by the power receiving antenna into a DC power. The bias circuit is configured to apply a DC bias to the rectifier diode.

Abstract: A portable charging device includes a housing, a power storage device, a charging interface, and a circuit board. The housing includes a power receiving-side wall and a charging-side wall. The power receiving-side wall and the charging-side wall include two surfaces of the housing that face each other. The charging interface is configured to supply power of the power storage device to an external device. A power receiving antenna is mounted on the circuit board. The power storage device and the charging interface are disposed so as to face the charging-side wall. The circuit board is disposed such that the power receiving antenna faces the power receiving-side wall.

Abstract: A power transmitting device includes a power transmitting unit configured to perform power transmission to the power receiving device through contactless power supply, and a memory unit that stores appropriate power supply information, and processing circuitry that is configured to switch a power transmission mode of the power transmitting unit. The processing circuitry is configured to acquire power supply information in a surrounding environment at execution of the power transmission, determine whether the power supply information and the appropriate power supply information are different from each other, set the power transmission mode to a limit mode when determining that the power supply information and the appropriate power supply information are different from each other, and set the power transmission mode to a normal-output mode when determining that the power supply information and the appropriate power supply information are not different from each other.

Abstract: A power transmitting device performs power transmission to a power receiving device. The power receiving device is provided in a space that a person can enter or exit. The power transmitting device includes a power transmitting unit, a processing circuitry, and a reception unit. The power transmitting unit is configured to perform power transmission to the power receiving device through contactless power supply. The processing circuitry is configured to switch a power transmission mode of the power transmitting unit between a normal-output mode and a limit mode in which a transmitted power is more limited than in the normal-output mode. The reception unit is configured to receive a limit instruction for the power transmission given by the person. The processing circuitry is configured to set the power transmission mode to the limit mode when the reception unit receives the limit instruction.

Abstract: A power transmitting device includes a power transmitting unit. The power transmitting unit is configured to transmit power through wireless power supply to a power receiving device disposed in a cabin of a mobile unit. At least one front seat and a rear seat are provided in the cabin to be aligned in a front-rear direction of the mobile unit. The interior of the cabin includes a first region that includes a region in which the front seat is disposed and a region on a front side, and a second region that includes a region in which the rear seat is disposed and a region on a rear side. The power transmitting unit is disposed such that a central axis of a power transmittable range in which the power can be transmitted is contained within the second region.

Abstract: An auxiliary power receiving device includes a power receiving unit, a notification unit, and a notification controlling unit. The power receiving unit receives power from a power transfer signal, which is used to supply power from a power transmitting device to a power receiving device. The notification unit may be provided on a main surface of a plate-shaped member. The notification controlling unit controls a notification performed by the notification unit in accordance with a power reception condition of the power transfer signal at the power receiving unit.

Abstract: A power transmitting device includes a power transmission unit using contactless power supply, processing circuitry configured to switch a power transmission mode of the power transmission unit between a normal output mode and a limit mode, and a transmission-side communication unit configured to execute communication with a power receiving device. The processing circuitry is configured to determine whether the power receiving device is a registered power receiving device based on information related to the power receiving device obtained from the transmission-side communication unit, determine whether the registered power receiving device is located inside a power transmission range of the power transmission unit, set the power transmission mode to the normal output mode when determining that the registered power receiving device is located inside the range, and set the power transmission mode to the limit mode when determining that the registered power receiving device is not located inside the range.

Abstract: A charger includes a power receiving unit, a power storage unit, and a power transmission unit. The power receiving unit is configured to receive, through wireless power supply via radio waves, power transmitted from a power transmitting device disposed in a vehicle. The power storage unit is configured to be supplied and charged with the power received by the power receiving unit. The power transmission unit is configured to transmit, through wireless power supply via electromagnetic induction, the power stored in the power storage unit to an electrical device that is to be charged.

Abstract: A power transmitting device includes a power transmission unit using contactless power supply, processing circuitry configured to switch a power transmission mode of the power transmission unit between a normal output mode and a limit mode, and a transmission-side communication unit configured to execute communication with a power receiving device. The processing circuitry is configured to determine whether the power receiving device is a registered power receiving device based on information related to the power receiving device obtained from the transmission-side communication unit, determine whether the registered power receiving device is located inside a power transmission range of the power transmission unit, set the power transmission mode to the normal output mode when determining that the registered power receiving device is located inside the range, and set the power transmission mode to the limit mode when determining that the registered power receiving device is not located inside the range.

Abstract: A power receiving device includes a power receiving antenna, a rectifier circuit, and a bias circuit. The power receiving antenna is configured to receive radio waves for supplying power. The rectifier circuit includes a rectifier diode and is configured to convert radio waves received by the power receiving antenna into a DC power. The bias circuit is configured to apply a DC bias to the rectifier diode.

Abstract: A power transmitting device includes a power transmitting unit configured to perform power transmission to the power receiving device through contactless power supply, and a memory unit that stores appropriate power supply information, and processing circuitry that is configured to switch a power transmission mode of the power transmitting unit. The processing circuitry is configured to acquire power supply information in a surrounding environment at execution of the power transmission, determine whether the power supply information and the appropriate power supply information are different from each other, set the power transmission mode to a limit mode when determining that the power supply information and the appropriate power supply information are different from each other, and set the power transmission mode to a normal-output mode when determining that the power supply information and the appropriate power supply information are not different from each other.

Abstract: An electronic device includes a power receiving device, a reception-side power storage unit configured to store power received by the power receiving device, a drive unit configured to be activated together with the power receiving device by the power stored in the reception-side power storage unit, a notification unit configured to notify a user of a state of the power in the reception-side power storage unit, a first power measurement unit configured to measure supplied power, a second power measurement unit configured to measure power consumption, and circuitry configured to change a notification mode in the notification unit based on a relationship between the supplied power and the power consumption.

Abstract: A power transmitting device performs power transmission to a power receiving device. The power receiving device is provided in a space that a person can enter or exit. The power transmitting device includes a power transmitting unit, a processing circuitry, and a reception unit. The power transmitting unit is configured to perform power transmission to the power receiving device through contactless power supply. The processing circuitry is configured to switch a power transmission mode of the power transmitting unit between a normal-output mode and a limit mode in which a transmitted power is more limited than in the normal-output mode. The reception unit is configured to receive a limit instruction for the power transmission given by the person. The processing circuitry is configured to set the power transmission mode to the limit mode when the reception unit receives the limit instruction.

Abstract: A contactless power supply system includes one or more power receiving devices, a power transmitting device, and a determining unit. The power receiving devices each include a transmitting unit and a power receiving unit. The power transmitting device includes a receiving unit and a power supplying unit. The determining unit is configured to determine, based on a prevention condition information that represents a prevention condition, whether the power receiving device that has transmitted the beacon signal satisfies the prevention condition. The power received by the power receiving device is prevented from increasing when the prevention condition is satisfied. The power supplying unit is configured to reduce power supply to the power receiving device that satisfies the prevention condition based on a determination result of the determining unit.

Abstract: A power transmitting device is configured to perform contactless power supply using a power transfer signal to a power receiving device that supplies power to a power supply target. The power transmitting device includes a power transmitting antenna, a region indicator unit, and processing circuitry. The power transmitting antenna is configured to transmit a power transfer signal to the power receiving device. The region indicator unit emits a visible beam. Based on a transmitted power that is transmitted as the power transfer signal, the processing circuitry derives a power receivable region, in which the power receiving device is capable of receiving the power transfer signal as a received power greater than or equal to a specified threshold. The processing circuitry uses the region indicator unit to emit the visible beam toward at least a part of the power receivable region.

Abstract: A contactless power supply system includes power receiving devices, a power transmitting device, and a determining unit. The power receiving devices each include a transmitting unit and a power receiving unit. The power transmitting device includes a receiving unit and a power supplying unit. Efficiency condition information is defined that includes an efficiency condition that indicates that the power transmitting device can transmit power to a power receiving device efficiently. The determining unit is configured to determine, based on the efficiency condition information, the power receiving device that satisfies the efficiency condition as the power receiving device to which the power transmitting device transmits power, among the power receiving devices from which the receiving unit has received the beacon signals. The power supplying unit is configured to supply power to the power receiving device that has been determined by the determining unit.