CONTACTLESS BATTERY CHARGER

• US 20140306655A1
• Filed: 06/24/2014
• Published: 10/16/2014
• Est. Priority Date: 12/27/2011
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: SADAKATA, Hideki, FUJITA, Atsushi, BESSYO, Daisuke
• Application Number:
  US14/313,433
• Publication Number:
  US 20140306655A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• 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 53/126 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: 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: H01F 41/077 Deforming the cross section or shape of the winding material while winding
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• 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 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A contactless battery charger includes a power feeding device having a power feeding coil to generate a magnetic flux using an inputted alternating current and a power receiving device having a power receiving coil disposed so as to confront the power feeding coil. The contactless battery charger supplies an electric power using electromagnetic induction between the power feeding coil and the power receiving coil. Each of the power feeding coil and the power receiving coil is formed by winding a litz wire made up of element wires. A width of the litz wire of the power feeding coil is smaller than a width of the litz wire of the power receiving coil in a first direction along opposing faces of the power feeding and receiving coils. The power receiving coil has an external diameter greater than or equal to that of the power feeding coil.

Claims

1. A contactless battery charger comprising:

a power feeding device having a power feeding coil to generate a magnetic flux using an inputted alternating current; and

a power receiving device having a power receiving coil disposed so as to confront the power feeding coil, wherein

the contactless battery charger is operable to supply an electric power using electromagnetic induction between the power feeding coil and the power receiving coil,

each of the power feeding coil and the power receiving coil is formed by winding a litz wire made up of a plurality of element wires,

a width of the litz wire of the power feeding coil is smaller than a width of the litz wire of the power receiving coil in a first direction along opposing faces of the power feeding coil and the power receiving coil, and

the power receiving coil has an external diameter greater than or equal to that of the power feeding coil.

2. The contactless battery charger according to claim 1, wherein a cross-section of the litz wire of the power feeding coil is flattened in a second direction perpendicular to the opposing faces of the power feeding coil and the power receiving coil.

3. The contactless battery charger according to claim 1, wherein a cross-sectional area of the litz wire of the power feeding coil is greater than a cross-sectional area of the litz wire of the power receiving coil.

4. The contactless battery charger according to claim 2, wherein a cross-sectional area of the litz wire of the power feeding coil is greater than a cross-sectional area of the litz wire of the power receiving coil.

5. The contactless battery charger according to claim 1, wherein a cross-section of the litz wire of the power receiving coil is flattened in the first direction.

6. The contactless battery charger according to claim 1, wherein a cross-sectional area of the litz wire of the power receiving coil is less than a cross-sectional area of the litz wire of the power feeding coil.

7. The contactless battery charger according to claim 5, wherein a cross-sectional area of the litz wire of the power receiving coil is less than a cross-sectional area of the litz wire of the power feeding coil.