Described herein are improved capabilities for a source resonator having a Q-factor Q 1 >100 and a characteristic size x 1 coupled to an energy source, and a second resonator having a Q-factor Q 2 >100 and a characteristic size x 2 coupled to an energy drain located a distance D from the source resonator, where the source resonator and the second resonator are coupled to exchange energy wirelessly among the source resonator and the second resonator.

Wireless energy transfer systems

Described herein are improved configurations for a wireless power converter that includes at least one receiving magnetic resonator configured to capture electrical energy received wirelessly through a first oscillating magnetic field characterized by a first plurality of parameters, and at least one transferring magnetic resonator configured to generate a second oscillating magnetic field characterized by a second plurality of parameters different from the first plurality of parameters, wherein the electrical energy from the at least one receiving magnetic resonator is used to energize the at least one transferring magnetic resonator to generate the second oscillating magnetic field.

Wireless energy transfer converters

Disclosed is an apparatus for use in wireless energy transfer, which includes a first resonator structure configured for energy transfer with a second resonator structure over a distance D larger than characteristic sizes, [insert formula] and [insert formula], of the first and second resonator structures. A power generator is coupled to the first structure and configured to drive the first resonator structure or the second resonator structure at an angular frequency away from the resonance angular frequencies and shifted towards a frequency corresponding to an odd normal mode for the resonator structures to reduce radiation from the resonator structures by destructive far-field interference.

Wireless energy transfer, including interference enhancement

A variable type magnetic resonator includes an array of resonators each having one of at least two substantially different magnetic dipole moment orientations and at least one power and control circuit configured to selectively connect to and energize at least one of the array of resonators.

Wireless energy transfer using variable size resonators and system monitoring

Described herein are improved configurations for a device for wireless power transfer that includes a conductor forming at least one loop of a high-Q resonator, a capacitive part electrically coupled to the conductor, and a power and control circuit electrically coupled to the conductor, the power and control circuit providing two or more modes of operation and the power and control circuit selecting how the high-Q resonator receives and generates an oscillating magnetic field.

Wireless energy transfer using repeater resonators

A magnetic resonance power transmitter of a magnetic resonance wireless power transmission system includes a resonance coil, an alternating current power source configured to cause the resonance coil to generate an alternating current, and a frequency changer configured to change, based on communication data, a frequency of the alternating current that the alternating current power source causes the resonance coil to generate.

Magnetic resonance power transmitter and magnetic resonance power receiver

Disclosed is a magnetic-resonant-coupling power transmission apparatus provided with communication function, wherein the cost thereof is reduced. The magnetic-resonant-coupling power transmission apparatus (100) of a magnetic-resonant-coupling wireless power transmission system (10) is provided with a resonance coil (110), an AC power supply (130) that generates an AC current on the resonance coil (110), and a frequency varying unit (140) that varies the frequency of the AC current to be generated by the AC power supply (130) on the resonance coil (110), on the basis of communication data.

Magnetic-resonant-coupling power transmission apparatus and magnetic-resonant-coupling power reception apparatus

A power transmission device has: a plurality of power transmission units which perform wireless power transmission of strong-coupling system; a communication unit which, when the plurality of power transmission units transmit power at different timings to a power reception device, receives from the power reception device a plurality of reception power values of power each received by the power reception device and posture information of the power reception device; and a control unit which calculates a plurality of efficiencies based on power values of power transmitted by the plurality of power transmission units and the received plurality of reception power values, obtains a plurality of equal efficiency surfaces with respect to the plurality of power transmission units based on the plurality of efficiencies and the received posture information, and estimates that the power reception device is present at a position where the plurality of equal efficiency surfaces intersect.

Power transmission device and power transmission and reception system

A portable apparatus includes a case, a coil situated inside the case, a circuit disposed inside the case to receive power based on a first frequency via the coil and to perform communication based on a second frequency higher than the first frequency, and a magnetic shield having a first portion and a second portion stacked one over another in a direction perpendicular to the coil between the coil and an inside of the case, the second portion being closer to the coil than the first portion, wherein permeability of the first portion is higher than permeability of the second portion situated toward the coil with respect to the first frequency.

Portable apparatus and feed system

A power transmission device includes: a power supply circuit that generates an alternating voltage; a power transmission coil that receives an alternating voltage generated by the power supply circuit to thereby generate a magnetic field; a power transmission resonator that includes: a resonant coil; and a resonant capacitor and through which electromagnetic induction causes an electric current to flow when a magnetic field is generated by the power transmission coil to enter a resonance state; and a control circuit that controls the position or the orientation of the power transmission coil with respect to the power transmission resonator in the direction in which a standing wave ratio in a transmission line from the power supply circuit to the power transmission coil decreases.

Akiyoshi Uchida

Papers

Magnetic resonance power transmitter and magnetic resonance power receiver

Magnetic-resonant-coupling power transmission apparatus and magnetic-resonant-coupling power reception apparatus

Power transmission device and power transmission and reception system

Portable apparatus and feed system

Power transmission device