Charging configuration for the inductive wireless emission of energy

• US 10,843,579 B2
• Filed: 09/29/2014
• Issued: 11/24/2020
• Est. Priority Date: 09/27/2013
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Komma, Thomas, Poebl, Monika
• Primary Examiner(s): Dunn, Drew A
• Assistant Examiner(s): Rankine, Tarikh Kanem
• Application Number:
  US14/499,438
• Publication Number:
  US 20150091519A1
• Time in Patent Office: 2,248 Days
• Field of Search: 320108
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• 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: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/34 Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
• 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 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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: 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

A charging configuration for the inductive wireless energy transfer to a receiver coil of an electrically operated vehicle. A first circularly wound electrically conductive coil extends in a plane and has a first central opening in the center of the first coil. A second circularly wound electrically conductive coil extends in a plane, coplanar with the first coil, and has a second central opening formed in its center. A ferrite core is supported on a shielding sheet with a rectangular base plate together with the coplanar coils. The coils are arranged in a coil holder on the shielding sheet such that a distance of between 15 and 25 mm remains between the shielding sheet and the bottom edge of the coils.

Claims

1. A charging configuration for inductive wireless transfer of energy to a receiving coil of an electrically operated vehicle, the charging configuration comprising:

a first circularly wound electrically conductive coil extending in a given plane and having a first central opening formed in a center of said first coil;

a second circularly wound electrically conductive coil extending in a given plane and having a second central opening formed in a center of said second coil;

said first and second coil having a bottom edge and being disposed in a coplanar relationship;

a ferrite core being U-shaped and having a first leg extending into said first central opening of said first coil and a second leg extending into said second central opening of said second coil, said second leg disposed opposite said first leg;

a shielding sheet with a rectangular base plate supporting said ferrite core and said coplanar coils thereon; and

a coil holder configured to hold said first and second coils on said shielding sheet to maintain a distance of between 15 and 25 mm between said shielding sheet and said bottom edge of said coils.

2. The charging configuration according to claim 1, wherein the distance is between 18 mm and 22 mm.

3. The charging configuration according to claim 1, wherein said ferrite core is configured as a planar plate running underneath said coils, said plate has a thickness of between 10 and 20 mm, and a first and second leg portion are connected to said plate.

4. The charging configuration according to claim 3, comprising a base plate arranged beneath said plate of said ferrite core, said base plate having a thickness of between 5 mm and 15 mm.

5. The charging configuration according to claim 4, wherein the thickness of said base plate lies between 6 mm and 10 mm.

6. The charging configuration according to claim 1, which comprises a controllable power supply connected to said first and second coils so as to cause a direction of a current in said second coil to be opposite a direction of a current in said first coil.

7. The charging configuration according to claim 1, wherein said first and second coils are equal in size.

8. The charging configuration according to claim 1, wherein said first and second coils are substantially rectangular.

9. A charging system, comprising:

a charging configuration according to claim 1; and

a receiver coil of an electrically operated vehicle, said receiver coil having a secondary ferrite core with a length dimension and a width dimension amounting to between 30% and 70% of a length dimension and a width dimension respectively of said plate of said ferrite core.