WIRELESS POWER TRANSMITTING DEVICE

• US 20130207480A1
• Filed: 02/08/2013
• Published: 08/15/2013
• Est. Priority Date: 02/10/2012
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: TOKO Incorporated (Murata Manufacturing Co Limited)
• Inventors: SHENG, Jianxin
• Granted Patent: US 9,391,477 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

There is provided a wireless power transmitting device which can detect relative positions of a power transmitting coil and a power receiving coil with a simple configuration, and reduce cost of components. The wireless power transmitting device has: a power transmitting coil which supplies power to a power receiving coil by way of electromagnetic induction; an excitation coil which excites the power receiving coil; a plurality of detecting coils which are arranged around a center of the power transmitting coil; and notifying units, and each of the detecting coils has a shape which widens apart from the center of the power transmitting coil, and the notifying units notify relative positions of the power transmitting coil and the power receiving coil by detecting an echo signal produced in the power receiving coil through the plurality of detecting coils.

Claims

1. A wireless power transmitting device comprising:

a power transmitting coil which supplies power to a power receiving coil by way of electromagnetic induction;

an excitation coil which excites the power receiving coil;

a plurality of detecting coils which are arranged around a center of the power transmitting coil; and

a notifying unit, wherein

each of the detecting coils comprises a shape which widens apart from the center of the transmitting power coil, and

the notifying unit notifies relative positions of the power transmitting coil and the power receiving coil by detecting an echo signal produced in the power receiving coil through the plurality of detecting coils.

2. The wireless power transmitting device according to claim 1, wherein the detecting coils which are adjacent are formed such that the adjacent detecting coils partially overlap each other.

3. The wireless power transmitting device according to claim 2, wherein the adjacent detecting coils are formed such that an overlapping range increases toward the center of the power transmitting coil.

4. The wireless power transmitting device according to claim 1, wherein an arbitrary detecting coil of the plurality of detecting coils is used.

5. The wireless power transmitting device according to claim 1, wherein the detecting coils which are adjacent are arranged to close to each other.

6. The wireless power transmitting device according to claim 1, wherein the plurality of detecting coils comprise a virtually fan shape obtained by dividing a concentric circle, a center of which is a center of the power transmitting coil, and plurality of detecting coils are arranged around the center of the power transmitting coil.

7. The wireless power transmitting device according to claim 1, wherein the plurality of detecting coils are symmetrically arranged around the center of the power transmitting coil.

8. The wireless power transmitting device according to claim 1, wherein the excitation coil comprises a plurality of coils arranged concentrically with the power transmitting coil and comprising different diameters.

9. The wireless power transmitting device according to claim 1, wherein the notifying unit is a light emitting element which is arranged in an outer circumferential direction of the plurality of detecting coils based on the center of the power transmitting coil.

10. A wireless power transmitting device comprising:

a power transmitting coil which supplies power to a power receiving coil by way of electromagnetic induction;

an excitation coil which excites the power receiving coil;

a plurality of first detecting coils which are arranged around a center of the power transmitting coil;

a second detecting coil; and

a notifying unit, wherein

each of the first detecting coils comprises a shape which widens apart from the center of the transmitting power coil,

the second detecting coil comprises a virtually circular shape which is arranged virtually concentrically with the power transmitting coil, and

the notifying unit notifies relative positions of the power transmitting coil and the power receiving coil by detecting an echo signal produced in the power receiving coil through the plurality of first detecting coils and the second detecting coil.

11. The wireless power transmitting device according to claim 10, wherein the first detecting coils which are adjacent are formed such that the adjacent first detecting coils partially overlap each other.

12. The wireless power transmitting device according to claim 11, wherein the adjacent first detecting coils are formed such that an overlapping range increases toward the center of the power transmitting coil.

13. The wireless power transmitting device according to claim 10, wherein an arbitrary detecting coil of the plurality of first detecting coils is used.

14. The wireless power transmitting device according to claim 10, wherein the first detecting coils which are adjacent are arranged to close to each other.

15. The wireless power transmitting device according to claim 10, wherein the plurality of first detecting coils comprise a virtually fan shape obtained by dividing a concentric circle, a center of which is a center of the power transmitting coil, and plurality of first detecting coils are arranged around the center of the power transmitting coil.

16. The wireless power transmitting device according to claim 10, wherein the plurality of first detecting coils are symmetrically arranged around the center of the power transmitting coil.

17. The wireless power transmitting device according to claim 10, wherein the excitation coil comprises a plurality of coils arranged concentrically with the power transmitting coil and comprising different diameters.

18. The wireless power transmitting device according to claim 10, wherein the notifying unit is a light emitting element which is arranged in an outer circumferential direction of the plurality of detecting coils based on the center of the power transmitting coil.