TRANSMITTER COILS FOR CONTACTLESS ENERGY TRANSMISSION SYSTEMS WITH COUPLING ENHANCEMENT AND STRAY FIELD REDUCTION

• US 20170047162A1
• Filed: 11/26/2015
• Published: 02/16/2017
• Est. Priority Date: 11/27/2014
• Status: Active Grant

• Current Assignee: BRUSA Elektronik AG
• Original Assignee: BRUSA Elektronik AG
• Inventors: MUNTEAN, Adina
• Granted Patent: US 9,905,360 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• 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: 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

The invention relates to a transmitter coil (1, 1a . . . 1f) for a contactless energy transmission system (8), comprising a winding (2) with a number of turns of at least one conductor. The winding (2) occupies a ring area (3) between an outer larger unequilateral rectangle (4) and an inner smaller unequilateral rectangle (5). The ring area (3) is wider on the longer side (x₁) of the outer rectangle (4) than it is on the shorter side (x₂) thereof. Moreover a transmitter (6) with such a transmitter coil (1, 1a . . . 1f) is proposed, which comprises a number of conductors and a number of power supplies (7, 7a, 7b) which can be switched and/or controlled independently of each other. Finally the invention also relates to an energy transmission system (8) with such a transmitter coil (1a . . . 1f)/such a transmitter (6) as well as a receiver coil (10) installed in a motor vehicle (9).

Claims

1. A transmitter coil (1, 1a, . . . 1f) for a contactless energy transmission system (8), comprising a winding (2) with a number of turns of at least one conductor, which occupies a ring area (3) between an outer larger unequilateral rectangle (4) and an inner smaller unequilateral rectangle (5),

characterised in that the ring area (3) is wider on the longer side (x₁) of the outer rectangle (4) than on the shorter side (x₂) thereof.

2. The transmitter coil (1, 1a . . . 1f) according to claim 1, characterised in that the turns of the winding (2) in the corners of the ring area (3) all comprise essentially the same radius (r).

3. The transmitter coil (1, 1a . . . 1f) according to claim 1 or 2, characterised in that adjacent turns of the winding (2) are at a larger distance from each other on the longer side of the outer rectangle (4) than on the shorter side thereof.

4. The transmitter coil (1, 1a . . . 1f) according to claim 1 or 2, characterised in that adjacent turns of the winding (2) are spaced apart from each other on the longer side (x₁) of the outer rectangle (4) and in contact with each other on the shorter side (x₂) thereof.

5. The transmitter coil (1, 1a . . . 1f) according to claim 1 or 2, characterised in that adjacent turns of the winding (2), on the longer side (x₁) and on the shorter side (x₂) of the outer rectangle (4), are all essentially at the same distance from each other or in contact with each other.

6. The transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 5, characterised in that the cross-section (Q) of the at least one conductor of the winding (2) is wider on the longer side (x₁) of the outer rectangle (4) than on the shorter side (x₂) of the outer rectangle (4).

7. The transmitter coil (1, 1a . . . 1f) according to claim 6, characterised in that the cross-section area of the at least one conductor of the winding (2) on the longer side (x₁) of the outer rectangle (4) is essentially the same size as on the shorter side (x₂) of the outer rectangle (4).

8. The transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 7, characterised in that the winding (2) on the longer side (x₁) of the outer rectangle (4) has fewer layers than on the shorter side (x₂) thereof.

9. The transmitter coil (1, 1a . . . 1f) according to claim 8, characterised in that in that the winding (2) on the longer side (x₁) of the outer rectangle (4) is of single-layer construction and on the shorter side (x₂) thereof is of two-layer construction.

10. The transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 9, characterised in that the winding (2) comprises a number of conductors.

11. The transmitter coil (1, 1a . . . 1f) according to claim 10, characterised in that the conductors of the winding (2) are twisted against each other by 90°

respectively, in the corners of the ring area (3).

12. The transmitter coil (1, 1a . . . 1f) according to claim 11, characterised in that the conductors of the winding (2), in each corner of the ring area (3), are twisted in alternate directions of rotation, respectively.

13. The transmitter coil (1, 1a . . . 1f) according to claim 11, characterised in that the conductors of the winding (2), in each corner of the ring area (3), are twisted in the same direction of rotation, respectively.

14. The transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 13, characterised in that an inner circle inscribed in a cross-section (Q) of at least one conductor lies within a range of 2 mm to 8 mm inclusively.

15. The transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 14, characterised in that the longer side (x₁) of the outer rectangle (4) lies within a range of 400 mm to 800 mm inclusively and/or the shorter side (x₂) of the outer rectangle (4), lies within a range of 200 mm to 600 mm inclusively.

16. A transmitter (6) of an energy transmission system (8) comprising a transmitter coil (1, 1a . . . 1f) according to one of claims 10 to 15, characterised in that the conductors of the winding (2) are connected to several different power supplies (7, 7a, 7b) which can be switched and/or controlled independently of one another.

17. An energy transmission system (8), characterised by a transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 15 or a transmitter (6) according to claim 16 as well as a receiver coil (10) installed in a motor vehicle (9).

18. The energy transmission system (8) according to claim 17, characterised by a transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 15 or a transmitter (6) according to claim 16 as well as motor vehicle (9) with a receiver coil (10) installed therein.

19. A use of a transmitter coil (1, 1a . . . 1f) according to one of claims 1 to 15 or a transmitter (6) according to claim 16 for charging a battery (11) arranged in a motor vehicle (9).