Coil unit, wireless power feeding device, wireless power receiving device, and wireless power transmission device

Patent metadata

Field	Value
Publication number	US-2016254706-A1
Application number	US-201615049245-A
Country	US
Kind code	A1
Filing date	Feb 22, 2016
Priority date	Feb 24, 2015
Publication date	Sep 1, 2016
Grant date	—

Abstract

A coil unit, a wireless power feeding device, a wireless power receiving device, and a wireless power transmission device are provided that are capable of reducing high voltage induced on the metal part. A coil unit Lu 1 includes a power transmission coil L 1, a first reactance circuit X 10 that is connected to one end portion of the winding of the power transmission coil L 1 and forms a resonant circuit together with the power transmission coil L 1, a metal part SD disposed on the same side as the back side of the power transmission coil L 1, and a first adjustment capacitor C 10 connected between the other end portion of the winding of the power transmission coil L 1 and the metal part SD.

First claim

What is claimed is:

1 . A coil unit comprising:
a power transmission coil; a first reactance circuit that is connected to one end portion of a winding of the power transmission coil, and forms a resonant circuit together with the power transmission coil; a metal part disposed on a same side as a back side of the power transmission coil; and a first adjustment capacitor connected between another end portion of the winding of the power transmission coil and the metal part.

2 . The coil unit according to claim 1 ,
wherein the winding of the power transmission coil is wound continuously in a layered manner, and wherein the coil unit further comprises a second adjustment capacitor, the second adjustment capacitor being connected to an end portion of the winding in a layer of the power transmission coil that is farthest from the metal part.

3 . The coil unit according to claim 1 ,
wherein the power transmission coil is wound continuously in a layered manner such that the other end portion of the winding is located in a layer that is farthest from the metal part, and wherein the coil unit further comprises a second reactance circuit, the second reactance circuit being connected to the other end portion of the winding of the power transmission coil and forming a resonant circuit together with the power transmission coil.

4 . A coil unit comprising:
a power transmission coil having a winding that is wound continuously in a layered manner; a metal part disposed on a same side as a back side of the power transmission coil; a first adjustment capacitor connected between one end portion of the winding of the power transmission coil, and the metal part; and a second adjustment capacitor connected between another end portion of the winding of the power transmission coil, and the metal part.

5 . The coil unit according to claim 4 ,
wherein the first adjustment capacitor and the second adjustment capacitor are connected in series with each other, and wherein the first adjustment capacitor and the second adjustment capacitor are connected to the metal part via a midpoint of connection between the first adjustment capacitor and the second adjustment capacitor.

6 . The coil unit according to claim 4 , further comprising:
a first reactance circuit that is connected to the one end portion of the winding of the power transmission coil, and forms a resonant circuit together with the power transmission coil; and a second reactance circuit that is connected to the other end portion of the winding of the power transmission coil, and forms a resonant circuit together with the power transmission coil.

7 . A coil unit comprising:
a power transmission coil; a reactance circuit that forms a resonant circuit together with the power transmission coil; a metal part disposed on a same side as a back side of the power transmission coil; and an adjustment capacitor that reduces a difference between a value of voltage applied via a parasitic capacitance created between a winding of the power transmission coil and the metal part, and a value of voltage applied across the reactance circuit.

8 . A wireless power feeding device comprising
a power feeding coil unit, wherein the power feeding coil unit is the coil unit according to claim 1 .

9 . A wireless power receiving device comprising
a power receiving coil unit, wherein the power receiving coil unit is the coil unit according to claim 1 .

10 . A wireless power transmission device comprising:
a wireless power feeding device having a power feeding coil unit; and a wireless power receiving device having a power receiving coil unit, wherein at least one of the power feeding coil unit and the power receiving coil unit is the coil unit according to claim 1 .

11 . A wireless power feeding device comprising
a power feeding coil unit, wherein the power feeding coil unit is the coil unit according to claim 4 .

12 . A wireless power receiving device comprising
a power receiving coil unit, wherein the power receiving coil unit is the coil unit according to claim 4 .

13 . A wireless power transmission device comprising:
a wireless power feeding device having a power feeding coil unit; and a wireless power receiving device having a power receiving coil unit, wherein at least one of the power feeding coil unit and the power receiving coil unit is the coil unit according to claim 4 .

14 . A wireless power feeding device comprising
a power feeding coil unit, wherein the power feeding coil unit is the coil unit according to claim 7 .

15 . A wireless power receiving device comprising
a power receiving coil unit, wherein the power receiving coil unit is the coil unit according to claim 7 .

16 . A wireless power transmission device comprising:
a wireless power feeding device having a power feeding coil unit; and a wireless power receiving device having a power receiving coil unit, wherein at least one of the power feeding coil unit and the power receiving coil unit is the coil unit according to claim 7 .

Assignees

• Tdk Corp

Inventors

• Saen Tsunehiro
• Nishiyama Tetsuya
• Suzuki Mitsunari

Classifications

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• B60L53/122

  Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• Y02T90/14

  Plug-in electric vehicles · CPC title