Showing papers by "Satoshi Shimokawa published in 2016"

Power receiver, power source, and wireless power transfer system

Abstract: A power receiver includes a power receiver coil, a secondary battery, a load resistor, a switch, and a power receiver controller. The power receiver coil is configured to wirelessly receive power from a power source, and the secondary battery is configured to be charged by power from the power receiver coil. The switch is configured to selectively connect the power receiver coil to the secondary battery or the load resistor, and the power receiver controller is configured to control the switch in accordance with a power supply state of the power source based on the power receiver coil, and a charged state of the secondary battery.

Power transmitting apparatus

Abstract: A power transmitting apparatus includes a plurality of primary-side resonant coils disposed along a conveyance path of a plurality of electronic devices and configured to utilize magnetic field resonance to transmit electric power to secondary-side resonant coils of the respective electronic devices conveyed along the conveyance path; and a plurality of phase adjusters connected between an alternating-current source and the respective primary-side resonant coils and configured to respectively adjust phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source, so as to uniform the phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source.

Center-Constricted Magnetic Core-Coil Structures for Resonant Wireless Power Transfer

Abstract: Magnetic core-coil structures for resonant wireless power transfer are proposed to enhance power transfer efficiency between opposed flat coils. A central region in the direction perpendicular to the plane of a magnetic core plate is constricted with a coil wound closely around the region to increase the figure of merit kQ, the product of the coupling coefficient k and the quality factor Q. The proposed effect is analyzed in terms of a magnetic circuit model. Electromagnetic field simulation of the systems determines the equivalent circuit parameters and confirms quantitatively the increase in kQ by the center-constricted structures.