Magnetic field shaping for inductive power transfer

• US 10,263,466 B2
• Filed: 09/07/2012
• Issued: 04/16/2019
• Est. Priority Date: 09/07/2011
• Status: Active Grant

• Current Assignee: Auckland UniServices Limited (Auckland University)
• Original Assignee: Auckland UniServices Limited (Auckland University)
• Inventors: Boys, John Talbot, Covic, Grant Anthony
• Primary Examiner(s): Fleming, Fritz M
• Assistant Examiner(s): Dhillon, Jagdeep S
• Application Number:
  US14/240,191
• Publication Number:
  US 20140361630A1
• Time in Patent Office: 2,412 Days
• Field of Search: 307 91, 307149, 307104, 307 101, 320107-109, 320116, 320119, 361820, 361818, 361816, 336182, 336178, 336180, 363 28, 363 30, 333 24 R, 333 20, 333 18, 191 10, 191 8
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/30 Constructional details of charging stations
• CPC Class Codes: B60L 53/39 with position-responsive activation of primary coils
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

An IPT system magnetic flux device for generating or receiving a magnetic flux, has a magnetically permeable core and at least one coil magnetically associated with the core. A shield repels magnetic flux and is located on the opposite side of the core such that the shield includes an outer portion that extends beyond at least part of the perimeter of the core.

Claims

1. An IPT system magnetic flux device for generating or receiving a magnetic flux for coupling with another device to transfer power inductively, the magnetic flux device comprising:

a magnetically permeable core;

at least two coils provided on a first side of the core and magnetically associated with the core; and

a flux shaping structure for shaping the magnetic flux for coupling provided on a side of the core opposite to the first side, the flux shaping structure comprising an outer portion that extends beyond at least part of the perimeter of the core, and a lip extending from the outer portion at an angle greater than 90 degrees relative to the outer portion,

wherein the at least two coils are substantially on the same plane.

2. The IPT system magnetic flux device as claimed in claim 1 wherein the outer portion has a peripheral edge, there is a gap between the core perimeter and the peripheral edge, and the gap is filled or partially filled with a non-magnetic material.

3. The IPT system magnetic flux device as claimed in claim 1 wherein the angle is between substantially 90 degrees and 150 degrees relative to the outer portion.

4. The IPT system magnetic flux device as claimed in claim 1 wherein the outer portion substantially circumscribes the core.

5. The IPT system magnetic flux device as claimed in claim 1 wherein the flux shaping structure further comprises a cage for shielding a conductor of at least one of the coils.

6. The IPT system magnetic flux device as claimed in claim 5 wherein the flange comprises a wall of the cage.

7. The IPT system magnetic flux device as claim 1 wherein the device comprises a pad.

8. The IPT system magnetic flux device as claimed in claim 1 wherein the outer portion extends from the device substantially in a plane of the core.

9. The IPT system magnetic flux device as claimed in claim 3 wherein a flange extends from the lip.

10. The IPT system magnetic flux device as claimed in claim 9 wherein the flange is in a plane substantially parallel to a plane that the outer portion lies within.

11. The IPT system magnetic flux device as claimed in claim 10 wherein the flange extends from the lip substantially adjacent to the first side of the core.

12. The IPT system magnetic flux device as claimed in claim 11 wherein the outer portion extends from longitudinal ends of the core.

13. The IPT system magnetic flux device as claimed in claim 1 wherein the flux shaping structure is provided as a layer.

14. The IPT system magnetic flux device as claimed in claim 1 wherein the core comprises pieces of magnetically permeable material.