WIRELESS POWER FEEDER, WIRELESS POWER RECEIVER, AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20110198940A1
• Filed: 04/18/2011
• Published: 08/18/2011
• Est. Priority Date: 10/19/2009
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Urano, Takashi
• Granted Patent: US 8,901,776 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Power is fed from a feeding coil to a receiving coil using magnetic resonance. The feeding coil is wound in a first layer substrate 144 of a multilayer substrate 116 with a space provided between the coil conductor thereof and further wound in a second later substrate 146 with a space provided between the coil conductor thereof. The feeding coil is wound such that a coil conductor 106a in the first layer and a coil conductive wire 106b in the second layer do not overlap each other as viewed in the axial direction (z-axis direction).

Claims

1. A wireless power feeder that feeds power from a feeding coil to a receiving coil by wireless using a magnetic field resonance phenomenon between the feeding coil and receiving coil, said feeder comprising:

a feeding coil circuit that includes the feeding coil; and

a power supply circuit that supplies AC power to the feeding coil, wherein

the feeding coil being wound in a first layer and in a second layer with a space between coil conductors ensured, and the coil conductor in the first layer and coil conductor in the second layer being alternately arranged as viewed in the axial direction of the feeding coil.

2. The wireless power feeder according to claim 1, wherein

the feeding coil is wound on a multilayer substrate having the first and second layers, and

both or one of the first and second layers of the multilayer substrate have a groove for accommodating the coil conductor of the feeding coil within the substrate.

3. The wireless power feeder according to claim 1, wherein

a hollow portion is formed in the center portion of the multilayer substrate and a cut portion is formed in a part of the hollow portion, and

the coil conductor in the first layer and coil conductor in the second layer connect with each other through the cut portion.

4. The wireless power feeder according to claim 1, wherein

the space is larger than the coil conductor diameter of the feeding coil.

5. The wireless power feeder according to claim 1, further comprising an exciting circuit including an exciting coil magnetically coupled to the feeding coil, wherein

the exciting circuit supplies the AC power supplied from the power supply circuit from the exciting coil to feeding coil, and

the exciting coil is wound inside the feeding coil.

6. The wireless power feeder according to claim 1, wherein

the power supply circuit makes the feeding coil that does not substantially resonate with circuit elements on the power feeding side feed the AC power to the receiving coil.

7. The wireless power feeder according to claim 1, wherein

the feeding coil does not form, together with circuit elements on the power feeding side, a resonance circuit having a resonance point corresponding to the resonance frequency of the receiving coil.

8. The wireless power feeder according to claim 1, wherein

no capacitor is connected in series or in parallel to the feeding coil.

9. The wireless power feeder according to claim 1, wherein

the feeding coil circuit is a circuit that resonates at the resonance frequency of the receiving coil.

10. A wireless power receiver that receives, at a receiving coil, AC power fed from a feeding coil by wireless using a magnetic field resonance phenomenon between the feeding coil and receiving coil, said receiver comprising:

a receiving coil circuit that includes a receiving coil and a capacitor; and

a loading circuit that includes a loading coil that is magnetically coupled to the receiving coil to receive the AC power from the receiving coil and a load to which the AC power is supplied from the loading coil, wherein

the receiving coil being wound in a first layer and in a second layer with a space between coil conductors ensured, and the coil conductor in the first layer and coil conductor in the second layer being alternately arranged as viewed in the axial direction of the receiving coil.

11. The wireless power receiver according to claim 10, wherein

the receiving coil is wound on a multilayer substrate having the first and second layers, and

both or one of the first and second layers of the multilayer substrate have a groove for accommodating the coil conductor of the receiving coil within the substrate.

12. The wireless power receiver according to claim 10, wherein

a hollow portion is formed in the center portion of the multilayer substrate and a cut portion is formed in a part of the hollow portion, and

the coil conductor in the first layer and coil conductor in the second layer connect with each other through the cut portion.

13. The wireless power receiver according to claim 10, wherein

the receiving coil circuit is a circuit that resonates at the resonance frequency of the feeding coil circuit.

14. A wireless power transmission system for feeding power from a feeding coil to a receiving coil by wireless using a magnetic field resonance phenomenon between the feeding coil and receiving coil, said system comprising:

a power supply circuit that supplies AC power to the feeding coil;

a feeding coil circuit that includes the feeding coil;

a receiving coil circuit that includes a receiving coil and a capacitor; and

a loading circuit that includes a loading coil that is magnetically coupled to the receiving coil to receive the AC power from the receiving coil and a load to which the AC power is supplied from the loading coil,

both or one of the feeding coil and receiving coil being wound in a first layer and in a second layer with a space between coil conductors ensured, and the coil conductor in the first layer and coil conductor in the second layer being alternately arranged as viewed in the power feeding direction.