Bifurcated balanced electromagnetic resonator

• US 10,654,365 B2
• Filed: 04/05/2016
• Issued: 05/19/2020
• Est. Priority Date: 04/29/2015
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG (Aptiv PLC)
• Original Assignee: Aptiv Technologies Limited (Aptiv PLC)
• Inventors: Borin, Boris
• Primary Examiner(s): Donovan, Lincoln D
• Assistant Examiner(s): Cheng, Diana J.
• Application Number:
  US15/090,834
• Publication Number:
  US 20160318407A1
• Time in Patent Office: 1,505 Days
• Field of Search: 307104, 320108
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: Y02B 10/30 Wind power
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A bifurcated electromagnetic resonator split into two separate coils, a first coil and a second coil. The inductance value of the first coil is substantially equal to the inductance value of the second coil. A matching network comprising passive electronic components, such as capacitors and inductors, is in series with and intermediate to the first coil and the second coil. This results in a resonator having a balanced circuit topology. The bifurcated resonator may be used as a source and/or capture resonator in a wireless power transfer system.

Claims

1. A bifurcated electromagnetic resonator, comprising:

a first coil;

a second coil, wherein the first coil is disposed within and surrounded by the second coil and wherein the first coil is connected in series and is co-planar with the second coil; and

a matching network comprising passive electronic components, wherein said matching network is connected in series with and intermediate to the first coil and the second coil and wherein a first inductance value of the first coil is substantially equal to a second inductance value of the second coil.

2. The bifurcated electromagnetic resonator according to claim 1, wherein the matching network consists of reactive electronic components.

3. The bifurcated electromagnetic resonator according to claim 2, wherein the matching network consists of capacitive components.

4. The bifurcated electromagnetic resonator according to claim 1, wherein an alternating electric current received by the bifurcated electromagnetic resonator generates an alternating magnetic field.

5. The bifurcated electromagnetic resonator according to claim 1, wherein an alternating magnetic field received by the bifurcated electromagnetic resonator generates an alternating electric current.

6. The bifurcated electromagnetic resonator according to claim 1, wherein the first and second coils are formed by circuit traces on a printed circuit board.

7. The bifurcated electromagnetic resonator according to claim 1, wherein the matching network is not connected directly to ground.

9. The wireless power transfer system according to claim 6, wherein the matching network consists of reactive electronic components.

10. The wireless power transfer system according to claim 6, wherein the matching network consists of capacitive components.

11. The wireless power transfer system according to claim 6, wherein the first and second coils are formed by circuit traces on a printed circuit board.

12. The wireless power transfer system according to claim 6, wherein the matching network is not connected directly to ground.

14. The wireless power transfer system according to claim 11, wherein the matching network consists of reactive electronic components.

15. The wireless power transfer system according to claim 12, wherein the matching network consists of capacitive components.

16. The wireless power transfer system according to claim 11, wherein the first and second coils are formed by circuit traces on a printed circuit board.

17. The wireless power transfer system according to claim 11, wherein the matching network is not connected directly to ground.

18. The bifurcated electromagnetic resonator according to claim 6, wherein the first and second coils are planar coils formed by the circuit traces on the printed circuit board.

19. The wireless power transfer system according to claim 11, wherein the first and second coils are planar coils formed by the circuit traces on the printed circuit board.

20. The wireless power transfer system according to claim 16, wherein the first and second coils are planar coils formed by the circuit traces on the printed circuit board.

8. A wireless power transfer system having a bifurcated source resonator configured to receive an alternating electric current and generate an alternating magnetic field and having a capture resonator configured to receive the alternating magnetic field and generate another alternating electric current, said bifurcated source resonator comprising:

a first coil;

a second coil, wherein the first coil is disposed within and surrounded by the second coil and wherein the first coil is connected in series and is co-planar with the second coil; and

a matching network comprising passive electronic components, wherein said matching network is connected in series with and intermediate to the first coil and the second coil and wherein a first inductance value of the first coil is substantially equal to a second inductance value of the second coil.

13. A wireless power transfer system having a source resonator configured to receive an alternating electric current and generate an alternating magnetic field and having a bifurcated capture resonator configured to receive the alternating magnetic field and generate another alternating electric current, said bifurcated capture resonator comprising:

a first coil;

a second coil, wherein the first coil is disposed within and surrounded by the second coil and wherein the first coil is connected in series and is co-planar with the second coil; and

a matching network comprising passive electronic components, wherein said matching network is connected in series with and intermediate to the first coil and the second coil and wherein a first inductance value of the first coil is substantially equal to a second inductance value of the second coil.