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 conversion device includes a first detection circuit that acquires input information about an AC voltage and/or an alternating current which are inputted to the power conversion device from an AC power supply, a rectifier circuit, an inverter circuit including a switch, and a control circuit that generates a pulse signal for the switch while the control circuit (A) determines, based on the input information, whether the rectifier circuit is in a state in which the rectifier circuit allows switching noise to propagate from the switch to the AC power supply and (B) changes a frequency of the pulse signal with time at least in a period in which the rectifier circuit is in the state.
Abstract:
An electric generator includes a magnetic flux generating unit that generates a magnetic flux, a rotation unit that rotates about a rotation axis, and an induction coil unit including a winding. The magnetic flux generating unit, the rotation unit, and the induction coil unit are arranged along the rotation axis. The rotation unit is disposed between the magnetic flux generating unit and the induction coil unit. The rotation unit includes a magnetic flux changing part. The magnetic flux changing part passes across a space through which the magnetic flux linked to the winding passes, by a rotation of the rotation unit. A density of the magnetic flux linked to the winding is changed by the magnetic flux changing part passing across the space. An electromotive force is induced in the induction coil unit in accordance with the change in the density of the magnetic flux linked to the winding.
Abstract:
Disclosed is a coil structure including: a first wire rod including a first coil portion and a first lead wire connected to the first coil portion, the first coil portion winding around a coil axis in a first space; a second wire rod including a second coil portion, the second coil portion winding around the coil axis in a second space, the second space being aligned with the first space along the coil axis; and an insulating structure including a first insulating section that insulates the first coil portion from the second coil portion. The first lead wire portion extends through the second space. The insulating structure fixes the first lead wire portion at a position that is away from the second coil portion by not less than a minimum creepage distance between the first and second coil portions, the minimum creepage distance being defined by the first insulating section.