Apparatus for Inductive Power Transmission

• US 20150015199A1
• 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 9,840,152 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• 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 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• 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 50/10 using inductive coupling
• 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: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• 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

Apparatus for inductively transmitting power, which apparatus comprises a primary unit with a primary coil and a secondary unit with a secondary coil, and in which the primary coil induces a magnetic transmission field in a transmission area between the primary unit and the secondary unit, and which has an even number of detector coil elements which are wound in opposite directions in pairs and form a detector pair.

Claims

1. An apparatus for inductively transmitting power, comprising a primary unit with a primary coil and a secondary unit with a secondary coil, wherein, the primary coil induces a magnetic transmission field in a transmission area between the primary unit and the secondary unit, and wherein

the apparatus has an even number of detector coil elements, and

the detector coil elements are wound in opposite directions in pairs and form a detector pair for detecting an induction voltage.

2. The apparatus as claimed in claim 1, wherein the detector pairs are electrically connected to one another in at least one series circuit,

the at least one series circuit forms at least one detector unit,

at least one measuring means for measuring an induction voltage at the detector unit is assigned to the at least one detector unit, and

the at least one detector unit can he introduced or has been introduced into the transmission area.

3. The apparatus as claimed in claim 2, wherein

the at least one detector unit is de-energized or the induction voltage is low in the case of a homogeneous transmission field, and

the induction voltage is increased at the at least one detector unit in the case of an inhomogeneous transmission field.

4. The apparatus as claimed claim 1, wherein

the at least one detector unit can he moved within a movement range perpendicular to the orientation of the transmission field in the transmission area, and

the movement range covers the transmission area.

5. The apparatus as claimed claim 2, wherein

the at least one detector unit can he moved within a movement range perpendicular to the orientation of the transmission field in the transmission area, and

the movement range covers the transmission area.

6. The apparatus as claimed claim 3, wherein

the at least one detector unit can be moved within a movement range perpendicular to the orientation of the transmission field in the transmission area, and

the movement range covers the transmission area.

7. The apparatus as claimed in one of claim 1, wherein the apparatus has a plurality of detector units in the transmission area, and the detector units cover the entire transmission area in a manner perpendicular to the orientation of the transmission field.

8. The apparatus as claimed in one of claim 2, wherein the apparatus has a plurality of detector units in the transmission area, and the detector units cover the entire transmission area in a manner perpendicular to the orientation of the transmission field.

9. The apparatus as claimed in one of claim 3, wherein the apparatus has a plurality of detector units in the transmission area, and the detector units cover the entire transmission area in a manner perpendicular to the orientation of the transmission field.

10. The apparatus as claimed in one of claim 4, wherein the apparatus has a plurality of detector units in the transmission area, and the detector units cover the entire transmission area in a manner perpendicular to the orientation of the transmission field.

11. The apparatus as claimed in claim 1, wherein the spatial extent of a detector coil element is adjustable.

12. A system having an apparatus as claimed in claim 1 and having a vehicle in order to inductively transmit power to the vehicle, wherein

the secondary unit is included in the vehicle and is situated in the region. of the underbody of the vehicle,

the primary unit is situated outside the vehicle, and

the at least one detector unit is included in the primary unit or the secondary unit.

13. The system as claimed in claim 12, wherein, with respect to the apparatus,

the detector pairs are electrically connected to one another in at least one series circuit,

the at least one series circuit forms at least one detector unit,

at least one measuring means for measuring an induction voltage at the detector unit is assigned to the at least one detector unit, and

the at least one detector unit can be introduced or has been introduced into the transmission area.

14. The system as claimed in claim 13, wherein, with respect to the apparatus,

the at least one detector unit is de-energized or the induction voltage is low in the case of a homogeneous transmission field, and

the induction voltage is increased at the at least one detector unit in the case of an inhomogeneous transmission field.

15. The system as claimed in claim 12, wherein, with respect to the apparatus,

the at least one detector unit can be moved within a movement range perpendicular to the orientation of the transmission field in the transmission area, and

the movement range covers the transmission area.

16. The system as claimed in claim 12, wherein the apparatus has a plurality of detector units in the transmission area, and the detector units cover the entire transmission area in a manner perpendicular to the orientation of the transmission field.

17. The system as claimed in claim 12, wherein the spatial extent of a detector coil element is adjustable.