Wireless power transmission apparatus
First Claim
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, anda power receiving switching circuit, electrically connected to the power receiving resonant circuit, including a switch device rectifying a resonance current flowing in a power receiving resonant circuit through on and off operations,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 electromagnetic resonance field and forms a new electromagnetic field resonance field on a basis of the resonant current,wherein the power transmitting device or the power receiving device, when viewed as a geometric figure, is a fractal-shaped device formed of a continuous line conductor pattern through which resonance current flows in which a portion is similar to a whole, and constitutes a differential coil structure in all locations and increases electromagnetic field energy in a space surrounding the fractal-shaped device, andwherein the switching control circuit makes the switching frequency fs satisfy a relationship fs=fr±
30% for a resonant frequency fr at which an imaginary part X of an equivalent input impedance when a whole load side is viewed from input of the power transmitting resonant circuit becomes zero, the input being connected to the power transmitting switching circuit.
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Accused Products
Abstract
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.
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Citations
22 Claims
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1. A wireless power transmission apparatus comprising:
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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 switching circuit, electrically connected to the power receiving resonant circuit, including a switch device rectifying a resonance current flowing in a power receiving resonant circuit through on and off operations, 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 electromagnetic resonance field and forms a new electromagnetic field resonance field on a basis of the resonant current, wherein the power transmitting device or the power receiving device, when viewed as a geometric figure, is a fractal-shaped device formed of a continuous line conductor pattern through which resonance current flows in which a portion is similar to a whole, and constitutes a differential coil structure in all locations and increases electromagnetic field energy in a space surrounding the fractal-shaped device, and wherein the switching control circuit makes the switching frequency fs satisfy a relationship fs=fr±
30% for a resonant frequency fr at which an imaginary part X of an equivalent input impedance when a whole load side is viewed from input of the power transmitting resonant circuit becomes zero, the input being connected to the power transmitting switching circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification