WIRELESS POWER TRANSMISSION APPARATUS

摘要

A power transmitter and a power receiver are arranged with a space therebetween. A power transmitting device generates a resonant current by taking out electric energy from a DC power supply through an operation of a power transmitting switch circuit, directly creating, in a space, by using the resonant current, an electromagnetic field that periodically changes at a switching frequency, and forms an electromagnetic resonance field in which the space itself has energy and vibrates. A power receiving device generates a resonant current by obtaining electric energy from the resonance field and forms a new electromagnetic field on the basis of this resonant current. The power transmitting device or the power receiving device, when viewed as a geometric figure, is a fractal-shaped device formed of a line conductor pattern in which a portion is similar to the whole, and increases electromagnetic field energy in a space surrounding the fractal-shaped device.

主权项

1. A wireless power transmission apparatus comprising:
a power transmitter including a DC power supply supplying electric energy and a power transmitting device electrically connected to the DC power supply, a power receiver including a load that consumes electric power and a power receiving device electrically connected to the load, a power transmitting resonant circuit formed of an inductive impedance included in the power transmitting device and a capacitive impedance of a resonant capacitor realized by a parasitic capacitance of the power transmitting device or an external capacitor, a power transmitting switching circuit, electrically connected to the power transmitting resonant circuit, including a switch device intermittently providing the power transmitting resonant circuit with the DC power supply through on and off operations and a switch control circuit causing the power transmitting resonant circuit to generate a resonant current through control of the switch device, a power receiving resonant circuit formed of an inductive impedance included in the power receiving device and a capacitive impedance of a resonant capacitor realized by a parasitic capacitance of the power receiving device or an external capacitor, and a power receiving load circuit that is connected to the power receiving resonant circuit and that supplies energy based on a resonant current to the load, wherein the power transmitter and the power receiver are arranged with a space therebetween, wherein the power transmitting device generates a resonant current by taking out electric energy from the DC power supply through an operation of the power transmitting switch circuit, and creates, in a space, by using the resonant current, an electromagnetic field that periodically changes at a switching frequency fs, and forms an electromagnetic resonance field in which the space itself has energy and vibrates, wherein the power receiving device generates a resonant current by obtaining electric energy from the resonance field and forms a new electromagnetic field resonance field on a basis of the resonant current, and wherein the power transmitting device or the power receiving device, when viewed as a geometric figure, is a fractal-shaped device formed of a line conductor pattern in which a portion is similar to a whole, and increases electromagnetic field energy in a space surrounding the fractal-shaped device.