Device for Inductively Transmitting Power

• US 20150015086A1
• Filed: 09/29/2014
• Published: 01/15/2015
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: KRAMMER, Josef, BERGER, Jens
• Granted Patent: US 9,912,167 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 3/0069 relating to the isolation, e.g. ground fault or leak current
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: G01V 3/10 using induction coils
• 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 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• 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 system is provided for inductive power transmission. The system includes a primary unit having a primary coil and a secondary unit having a secondary coil. The primary coil generates a magnetic transmission field in a transmission area between the primary unit and the secondary unit. The system includes a metal detector, and the metal detector is suitable for the detection of a metallic object situated in the transmission area.

Claims

1. A system for inductive power transmission, the system comprising:

a primary unit having a primary coil;

a secondary unit haying a secondary coil;

a metal detector, wherein

the primary coil generates a magnetic transmission field in a transmission area between the primary unit and the secondary unit, and

the metal detector is configured to detect metallic objects in the transmission area.

2. The system according to claim 1, wherein the metal detector comprises:

at least one pair of coils, said pair of coils comprising a transmitter coil and a signal coil.

3. The system according to claim 2, wherein:

the signal coil has at least two coil elements,

the two coil elements are wound in opposite directions,

the two coil elements are electrically connected in series, and

the two coil elements are symmetrical with respect to an axis along the magnetic transmission field is oriented in the transmission area.

4. The system according to claim 3, wherein the metal detector is configured to operate according to a pulse measuring method and/or an alternating-current measuring method with an alternating frequency.

5. The system according to claim 1, wherein the metal detector is configured to operate according to a pulse measuring method and/or to an alternating-current measuring method with an alternating frequency.

6. The system according to claim 4, wherein:

the primary coil of the primary unit generates the magnetic transmission field with a defined transmission frequency, and

the defined transmission frequency is multiple times greater than or multiple times less than the alternating frequency of the metal detector.

7. The system according to claim 5, wherein:

the primary coil of the primary unit generates the magnetic transmission field with a defined transmission frequency, and

the defined transmission frequency is multiple times greater than or multiple times less than the alternating frequency of the metal detector.

8. An arrangement for power transmission, the arrangement comprising:

a vehicle;

a power transmission system, the power system transmission comprising;

a primary unit having a primary coil;

a secondary unit having a secondary coil;

a metal detector, wherein

the primary coil generates a magnetic transmission field in a transmission area between the primary unit and the secondary unit,

the metal detector is configured to detect metallic objects in the transmission area,

the secondary unit is a part of the vehicle and is arranged in an area of an underbody of the vehicle,

the primary unit is arranged externally with respect to the vehicle,

electric power is inductively transmittable to the vehicle, and

the metal detector is a part of either the primary unit or the secondary unit.

9. The arrangement according to claim 8, wherein the metal detector comprises:

at least one pair of coils, said pair of coils comprising a transmitter coil and a signal coil.

10. The arrangement according to claim 9, wherein:

the signal coil has at least two coil elements,

the two coil elements are wound in opposite directions,

the two coil elements are electrically connected in series, and

the two coil elements are symmetrical with respect to an axis along which the magnetic transmission field is oriented in the transmission area.

11. The arrangement according to claim 10, wherein the metal detector is configured to operate according to a pulse measuring method and/or an alternating current measuring method with an alternating frequency.

12. The arrangement according to claim 11, wherein:

the primary coil of the primary unit generates the magnetic transmission field with a defined transmission frequency, and

the defined transmission frequency is multiple times greater than or multiple times less than the alternating frequency of the metal detector.