Wireless power transmitting method and apparatus using dual-loop in-phase feeding

• US 9,837,830 B2
• Filed: 04/27/2015
• Issued: 12/05/2017
• Est. Priority Date: 04/25/2014
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Yun, Je Hoon, Kim, Seong Min, Moon, Jung Ick, Cho, In Kui
• Primary Examiner(s): Lam, Tuan T
• Application Number:
  US14/696,562
• Publication Number:
  US 20150311728A1
• Time in Patent Office: 953 Days
• Field of Search: None
• 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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

Provided are wireless power transmitting method and apparatus using dual-loop in-phase feeding. The wireless power transmitting apparatus includes a generator configured to generate a Radio Frequency (RF) signal, an amplifier configured to amplify the generated RF signal, a matching circuit configured to be connected to the amplifier to perform impedance matching, a first resonator configured to comprise a first feeding loop connected to the matching circuit and transmit wireless power using a signal provided through the first feeding loop, and a second resonator configured to comprise a second feeding loop connected to the matching circuit and transmit wireless power using a signal provided through the second feeding loop, wherein the first and second feeding loops are formed in a manner that allows magnetic fields respectively generated by the first and second resonators to be excited in the same direction and in phase.

Claims

1. A wireless power transmitting apparatus comprising:

a generator configured to generate a Radio Frequency (RF) signal;

an amplifier configured to amplify the generated RF signal;

a matching circuit configured to be connected to the amplifier to perform impedance matching;

a first resonator configured to comprise a first feeding loop connected to the matching circuit and transmit wireless power using a signal provided through the first feeding loop; and

a second resonator configured to comprise a second feeding loop connected to the matching circuit and transmit wireless power using a signal provided through the second feeding loop,

wherein the first and second feeding loops are formed in a manner that allows magnetic fields respectively generated by the first and second resonators to be excited in the same direction and in phase without switch control of the first and second feeding loops.

2. The wireless power transmitting apparatus of claim 1, wherein current are flow on the same direction in the first and second feeding loops.

3. The wireless power transmitting apparatus of claim 1, wherein a charging area is formed between the first and second resonators.

4. The wireless power transmitting apparatus of claim 1, wherein the first and second resonators are connected to the matching circuit in parallel, and the first and second feeding loops are at the same distance from a point where an RF signal is separated to be provided to each of the first and second feeding loops.

5. The wireless power transmitting apparatus of claim 4, wherein the first and second resonators and the matching circuit are connected to one another using a “

T”

-shaped connector.

6. The wireless power transmitting apparatus of claim 1, wherein the first and second resonators are connected to the matching circuit in serial.

7. The wireless power transmitting apparatus of claim 1, wherein at least one of the first and second resonators comprises a resonant coil.

8. The wireless power transmitting apparatus of claim 1, further comprising:

a controller configured to control, based on information received from a wireless power receiving apparatus, a magnitude of wireless power to be transmitted to each of the first and second resonators.

9. A wireless power transmitting method which is implemented by a wireless power transmitting apparatus, the method comprising:

generating a Radio Frequency (RF) signal;

amplifying the generated RF signal;

performing impedance matching on the amplified signal;

providing a resultant signal to a first resonator using a first feeding loop and to a second resonator using a second feeding loop; and

transmitting wireless power to a wireless power receiving apparatus by using the first and second resonators,

wherein the first and second feeding loops are formed in a manner that allow magnetic fields respectively generated by the first and second resonators to be excited in the same direction and in phase without switch control of the first and second resonators.

10. The wireless power transmitting method of claim 9, wherein current flow in the same direction in the first and second feeding loops.

11. The wireless power transmitting method of claim 9, wherein a charging area is formed between the first and second resonators.

12. The wireless power transmitting method of claim 9, wherein the first and second resonators are connected in parallel to a matching circuit that performs the impedance matching, and the first and second feeding loops are at the same distance from a point where an RF signal is separated to be provided to each of the first and second feeding loops.

13. The wireless power transmitting method of claim 12, wherein the first and second resonators and the matching circuit are connected to one another using a “

T”

-shaped connector.

14. The wireless power transmitting method of claim 9, wherein the first and second resonators are connected in serial to a matching circuit that performs the impedance matching.

15. The wireless power transmitting method of claim 9, wherein at least one of the first and second resonators comprises a resonant coil.

16. The wireless power transmitting method of claim 9, further comprising:

controlling, based on information received from a wireless power receiving apparatus, a magnitude of wireless power transmitted from each of the first and second resonators.

17. A wireless power receiving apparatus comprising:

a plurality of resonators, each configured to receive wireless power from a wireless power transmitting apparatus based on magnetic resonance;

a matching circuit configured to be connected to the plurality of resonators to perform impedance matching; and

a rectifier configured to rectify current input through the matching circuit,

wherein the plurality of resonators are formed in a manner that allows magnetic fields respectively generated by the plurality of resonators to be excited in the same direction and in phase without switch control of the plurality of resonators.

18. The wireless power receiving apparatus of claim 17, wherein current flow in the same direction in the plurality of resonators.

19. The wireless power receiving apparatus of claim 17, wherein the plurality of resonators are connected in parallel to the matching circuit, and cables connecting the matching circuit to each of the plurality of resonators have the same length.

20. The wireless power receiving apparatus of claim 17, wherein the plurality of resonators are connected to the matching circuit in serial.