Wireless power supply apparatus
First Claim
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1. A wireless power supply apparatus comprising:
- a power transmitter including a power source that supplies an AC current and a power transmission device electrically connected to the power source;
a power receiver including a load that consumes electrical energy and a power reception device electrically connected to the load;
a power transmission resonance circuit constituted by an inductive impedance and a capacitive impedance of the power transmission device;
a power reception resonance circuit constituted by an inductive impedance and a capacitive impedance of the power reception device; and
a power reception load circuit that is electrically connected to the power reception resonance circuit and that supplies electrical energy produced by an AC current to the load,wherein the power transmitter and the power receiver are disposed with a space provided therebetween;
the power transmission device produces an electromagnetic field that periodically changes using the AC current in a space, and forms a vibrating electromagnetic resonance field in which the space itself has energy;
the power reception device provides an AC current by obtaining electrical energy from the resonance field and forms a new electromagnetic resonance field using the AC current;
the power transmission device or the power reception device is constituted by a differential coil structure in all locations by having a continuous conductor having a Peano curve shape that covers a surface having a given spread by passing through all regions obtained by dividing the surface having a given spread without intersecting with itself, and the electromagnetic field energy of a space where the power transmission device and the power reception device are disposed is increased locally; and
the power source that supplies the AC current provides a relationship of fs=fr±
30% for a frequency fs of the AC current relative to a resonant frequency fr at which an imaginary part X of an equivalent input impedance when a load side is viewed as a whole from the input to which the power source of the power transmission resonance circuit is connected becomes 0.
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Abstract
A power transmitter and a power receiver are disposed with a space provided therebetween, and a power transmission device produces an electromagnetic field that periodically changes using the AC current in a space and forms a vibrating electromagnetic resonance field in which the space itself has energy. By obtaining electrical energy from the resonance field, a power reception device produces a resonance current, and a new electromagnetic resonance field is formed by the resonance current. The power transmission device or the power reception device is constituted of a conductor having a Peano curve shape that covers a surface having a given spread by passing through all regions obtained by dividing the surface having a given spread without intersecting with itself, and the electromagnetic field energy of a space in the periphery of the fractal-shaped device is increased.
12 Citations
21 Claims
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1. A wireless power supply apparatus comprising:
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a power transmitter including a power source that supplies an AC current and a power transmission device electrically connected to the power source; a power receiver including a load that consumes electrical energy and a power reception device electrically connected to the load; a power transmission resonance circuit constituted by an inductive impedance and a capacitive impedance of the power transmission device; a power reception resonance circuit constituted by an inductive impedance and a capacitive impedance of the power reception device; and a power reception load circuit that is electrically connected to the power reception resonance circuit and that supplies electrical energy produced by an AC current to the load, wherein the power transmitter and the power receiver are disposed with a space provided therebetween; the power transmission device produces an electromagnetic field that periodically changes using the AC current in a space, and forms a vibrating electromagnetic resonance field in which the space itself has energy; the power reception device provides an AC current by obtaining electrical energy from the resonance field and forms a new electromagnetic resonance field using the AC current; the power transmission device or the power reception device is constituted by a differential coil structure in all locations by having a continuous conductor having a Peano curve shape that covers a surface having a given spread by passing through all regions obtained by dividing the surface having a given spread without intersecting with itself, and the electromagnetic field energy of a space where the power transmission device and the power reception device are disposed is increased locally; and the power source that supplies the AC current provides a relationship of fs=fr±
30% for a frequency fs of the AC current relative to a resonant frequency fr at which an imaginary part X of an equivalent input impedance when a load side is viewed as a whole from the input to which the power source of the power transmission resonance circuit is connected becomes 0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification
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Current AssigneeMurata Manufacturing Co Limited
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Original AssigneeMurata Manufacturing Co Limited
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InventorsHosotani, Tatsuya, Doi, Tatsuya
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Primary Examiner(s)Cole, Brandon S
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Application NumberUS14/861,324Publication NumberTime in Patent Office1,211 DaysField of Search307 89-112US Class CurrentCPC Class CodesH01F 27/2804 Printed windingsH01F 38/14 Inductive couplings for wir...H02J 50/005 Mechanical details of housi...H02J 50/10 using inductive couplingH02J 50/12 of the resonant typeH02J 50/70 involving the reduction of ...H02J 50/80 involving the exchange of d...
