APPARATUS FOR TRANSFERRING ELECTROMAGNETIC ENERGY

• US 20150001950A1
• Filed: 07/01/2013
• Published: 01/01/2015
• Est. Priority Date: 07/01/2013
• Status: Abandoned Application

• Current Assignee: City University of Hong Kong
• Original Assignee: City University of Hong Kong
• Inventors: Chung, Shu Hung Henry, Chen, Nan, Chow, Po Wa Jeff, Chan, Lai Hang Leanne
• Application Number:
  US13/932,353
• Publication Number:
  US 20150001950A1
• 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 50/005 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 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

An apparatus for transferring electromagnetic energy includes a coil arrangement operable to transmit magnetic flux to a receiver or to receive magnetic flux from a transmitter, wherein the coil arrangement includes a main coil and at least one auxiliary coil electrically combined with the main coil such that the combination of the main coil and the at least one auxiliary coil is arranged to alter an electromagnetic coupling between the coil arrangement and the transmitter or the receiver to increase an operation alignment range between the coil arrangement and the transmitter or the receiver.

Claims

1. An apparatus for transferring electromagnetic energy comprising a coil arrangement operable to transmit magnetic flux to a receiver or to receive magnetic flux from a transmitter, wherein the coil arrangement includes a main coil and at least one auxiliary coil electrically combined with the main coil such that the combination of the main coil and the at least one auxiliary coil is arranged to alter an electromagnetic coupling between the coil arrangement and the transmitter or the receiver to increase an operation alignment range between the coil arrangement and the transmitter or the receiver.

2. An apparatus in accordance with claim 1, wherein each of the main coil and the at least one auxiliary coil is operable to transmit magnetic flux to the receiver or to receive magnetic flux from the transmitter.

3. An apparatus in accordance with claim 1, wherein the increased operation alignment range between the coil arrangement and the transmitter or the receiver includes an increased displacement and/or angular alignment between the coil arrangement and the transmitter or the receiver.

4. An apparatus in accordance with claim 1, wherein each of the main coil and the at least one auxiliary coil have different spatial orientations.

5. An apparatus in accordance with claim 1, wherein the electromagnetic coupling between the coil arrangement and the transmitter or the receiver defines an overall mutual coupling.

6. An apparatus in accordance with claim 5, wherein the electrical combination of the main coil and each of the at least one auxiliary coil is interchangeable depending on a misalignment condition between the coil arrangement and the transmitter or the receiver so as to maximize the overall mutual coupling.

7. An apparatus in accordance with claim 6, wherein the main coil and the at least one auxiliary coil each defines a plane, the planes being arranged to be defined by one or more intersections of the main coil with the at least one auxiliary coil.

8. An apparatus in accordance with claim 1, wherein the main coil and the at least one auxiliary coil are electrically connected in series.

9. An apparatus in accordance with claim 1, wherein the main coil and the at least one auxiliary coil are electrically connected in parallel.

10. An apparatus in accordance with claim 7, wherein the plane defined by the main coil is orthogonal to at least one of the plane defined by the at least one auxiliary coil.

11. An apparatus in accordance with claim 1, wherein the main coil and the at least one auxiliary coil are simultaneously energized.

12. An apparatus in accordance with claim 1, wherein the main coil and the at least one auxiliary coil each comprises at least one turn.

13. An apparatus in accordance with claim 1, wherein the main coil and the at least one auxiliary coil each resembles a circular, square, rectangular, triangular, polygonal, spiral or any irregular shape.

14. An apparatus in accordance with claim 1, wherein litz wires are used in the main coil and/or the at least one auxiliary coil.

15. An apparatus in accordance with claim 1, wherein the main coil and/or the at least one auxiliary coil is defined by a single core wire, multi core wire, printed circuit board (PCB) track or any combination thereof.

16. An apparatus in accordance with claim 1, wherein the coil arrangement defines a first inductance and a first resistance and the transmitter or the receiver defines a second inductance and a second resistance;

and the coil arrangement is coupled with the transmitter or the receiver through a third inductance defined by the electromagnetic coupling between the coil arrangement and the transmitter or the receiver.

17. An apparatus in accordance with claim 1, wherein a load is connected to the coil arrangement when the coil arrangement is arranged to receive electromagnetic energy from the transmitter.

18. An apparatus in accordance with claim 17, wherein the coil arrangement is further connected with a capacitive component arranged to resonate with the first inductance of the coil arrangement on an operating frequency so as to increase an energy transfer efficiency between the coil arrangement and the transmitter.

19. An apparatus in accordance with claim 18, wherein the capacitive component is connected in series with the load.

20. An apparatus in accordance with claim 18, wherein the capacitive component is connected in parallel with the load.

21. An apparatus in accordance with claim 1, wherein each of the at least one auxiliary coil is transposed vertically, horizontally or both vertically or horizontally about an axis of the main coil.

22. An apparatus in accordance with claim 1, wherein the main coil and the at least one auxiliary coil have a spiral, solenoid or rectangular winding structure.

23. A wireless inductive link arranged to transfer electromagnetic energy comprising a receiver and a transmitter, wherein at least one of the transmitter or the receiver is an apparatus in accordance with claim 1.