Wireless Power Receiving Unit For Receiving Power, A Wireless Power Transferring Unit For Transferring Power, A Wireless Power Transferring Device And Use Of Wireless Power Transferring Device

• US 20130082539A1
• Filed: 11/21/2012
• Published: 04/04/2013
• Est. Priority Date: 05/26/2010
• Status: Active Grant

• Current Assignee: ABB BV (ABB Limited)
• Original Assignee: ABB Research Ltd. (ABB Limited)
• Inventors: Tengner, Tomas
• Granted Patent: US 8,829,732 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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: 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: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• 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 wireless power transferring device, a wireless power transferring unit and a wireless power receiving unit for transferring and receiving power. The power receiving unit includes an induction coil adapted to be subjected to an alternating magnetic field so that an alternating current is induced in the induction coil, a receiving concentrator core adapted to concentrate the magnetic field wherein the receiving concentrator core is surrounded by a medium, and a receiving guide member arranged to provide a smooth transition for the magnetic field between the medium and the concentrator core, and abutting the receiving concentrator core. The receiving guide member has a magnetic permeability in the range between the magnetic permeability of the receiving concentrator core and the medium.

Claims

1. A wireless power receiving unit for receiving power, wherein the power receiving unit comprises:

an induction coil, which induction coil is adapted to be subjected to power in the form of an alternating magnetic field from a power transferring unit so that an alternating current is induced in the induction coil, and

a receiving concentrator core for concentrating the magnetic field towards the induction coil, wherein the receiving concentrator core is surrounded by a medium,

characterized in that

the power receiving unit comprises a receiving guide member arranged to provide a transition for the magnetic field between the medium and the receiving concentrator core, and abutting the receiving concentrator core, which receiving guide member has a magnetic permeability in the range between the magnetic permeability of the receiving concentrator core and the medium.

2. The wireless power receiving unit according to claim 1, characterized in that the receiving guide member at least partly surrounds the receiving concentrator core.

3. The wireless power receiving unit according to claim 1, characterized in that the receiving guide member comprises an inner part abutting the receiving concentrator core and an outer part abutting the surrounding medium.

4. The wireless power receiving unit according to claim 3, characterized in that the magnetic permeability of the receiving guide member is decreasing from the inner part to the outer part.

5. The wireless power receiving unit according to claim 3, characterized in that the magnetic permeability of the receiving guide member is decreasing continuously from the inner part to the outer part.

6. The wireless power receiving unit according to claim 1, characterized in that the receiving guide member comprises an inner ring abutting the receiving concentrator core and an outer ring abutting the surrounding medium, wherein the magnetic permeability of the inner ring is higher than the outer ring.

7. The wireless power receiving unit according to claim 1, characterized in that the induction coil comprises a center axis and the receiving concentrator core comprises an envelope surface, which envelope surface is directed away from the center axis, wherein the receiving guide member is abutting the envelope surface of the receiving concentrator core.

8. The wireless power receiving unit according to claim 1, characterized in that the power receiving unit comprises a shield member adapted to shield the magnetic field, wherein the shield member comprises a conductive non-magnetic material.

9. The wireless power receiving unit according to claim 8, characterized in that the shield member is adapted to be located in between the induction coil and an arrangement comprising a ferromagnetic conductive material.

10. The wireless power receiving unit according to claim 1, characterized in that the power receiving unit is adapted to be connected to a battery unit, wherein the alternating current induced in the induction coil is adapted to charge the battery unit.

11. The wireless power receiving unit according to claim 1, characterized in that the power receiving unit is adapted to be arranged at vehicle and directed towards the power transferring unit arranged at the ground.

12. A wireless power transferring unit for transferring power, wherein the power transferring unit comprises:

a generating coil, which generating coil is adapted to generate power in the form of an alternating magnetic field that is subjected to a power receiving unit, and

a transferring concentrator core for concentrating the magnetic field towards the power receiving unit, wherein the transferring concentrator core is surrounded by a medium,

characterized in that

the power transferring unit comprises a transferring guide member arranged to provide a transition for the magnetic field between the medium and the transferring concentrator core, and at least partly abutting the transferring concentrator core, which transferring guide member has a magnetic permeability in the range between the magnetic permeability of the transferring concentrator core and the medium.

13. The wireless power transferring unit according to claim 12, characterized in that the transferring guide member at least partly surrounds the transferring concentrator core.

14. A wireless power transferring device comprising;

a wireless power transferring unit for transferring power, wherein the power transferring unit comprises;

a generating coil, which generating coil is adapted to generate power in the form of an alternating magnetic field that is subjected to a power receiving unit, and

a transferring concentrator core for concentrating the magnetic field towards the power receiving unit, wherein the transferring concentrator core is surrounded by a medium,

characterized in that

the power transferring unit comprises a transferring guide member arranged to provide a transition for the magnetic field between the medium and the transferring concentrator core, and at least partly abutting the transferring concentrator core, which transferring guide member has a magnetic permeability in the range between the magnetic permeability of the transferring concentrator core and the medium; and

a wireless power receiving unit, wherein the power receiving unit comprises;

an induction coil, which induction coil is adapted to be subjected to power in the form of an alternating magnetic field from a power transferring unit so that an alternating current is induced in the induction coil, and

a receiving concentrator core for concentrating the magnetic field towards the induction coil, wherein the receiving concentrator core is surrounded by a medium, characterized in that

the power receiving unit comprises a receiving guide member arranged to provide a transition for the magnetic field between the medium and the receiving concentrator core, and abutting the receiving concentrator core, which receiving guide member has a magnetic permeability in the range between the magnetic permeability of the receiving concentrator core and the medium.

15. Use of a wireless power transferring device for transferring power to a vehicle comprising:

a wireless power transferring unit for transferring power, wherein the power transferring unit comprises;

a generating coil, which generating coil is adapted to generate power in the form of an alternating magnetic field that is subjected to a power receiving unit, and

a transferring concentrator core for concentrating the magnetic field towards the power receiving unit, wherein the transferring concentrator core is surrounded by a medium,

characterized in that

the power transferring unit comprises a transferring guide member arranged to provide a transition for the magnetic field between the medium and the transferring concentrator core, and at least partly abutting the transferring concentrator core, which transferring guide member has a magnetic permeability in the range between the magnetic permeability of the transferring concentrator core and the medium; and

a wireless power receiving unit, wherein the power receiving unit comprises;

an induction coil, which induction coil is adapted to be subjected to power in the form of an alternating magnetic field from a power transferring unit so that an alternating current is induced in the induction coil, and

a receiving concentrator core for concentrating the magnetic field towards the induction coil, wherein the receiving concentrator core is surrounded by a medium, characterized in that

the power receiving unit comprises a receiving guide member arranged to provide a transition for the magnetic field between the medium and the receiving concentrator core, and abutting the receiving concentrator core, which receiving guide member has a magnetic permeability in the range between the magnetic permeability of the receiving concentrator core and the medium.