Coil device and wireless power transmission device

Patent metadata

Field	Value
Publication number	US-10284017-B2
Application number	US-201615254331-A
Country	US
Kind code	B2
Filing date	Sep 1, 2016
Priority date	Sep 2, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A coil device and a wireless power transmission device which can detect the happened open fault or short fault reliably in any one of the plurality of capacitor elements constituting the capacitor circuit. Coil device includes coil for power transmission, capacitor circuit connected to coil for power transmission and having a plurality of capacitor elements, conductive metal portion which is disposed close to coil for power transmission, and measuring portion for measuring a voltage or a current generated in metal portion.

First claim

What is claimed is:

1. A coil device comprising,
a coil for power transmission,
a capacitor circuit connected to the coil for power transmission and having a plurality of capacitor elements,
a conductive metal portion which is disposed close to the coil for power transmission, and
a measuring portion connected to the conductive metal portion for measuring a voltage or a current generated in the metal portion.

2. The coil device of claim 1 , wherein,
the capacitor circuit comprises a first capacitor circuit which is connected to one end of the coil for power transmission and a second capacitor circuit which is connected to the other end of the coil for power transmission,
a combined electrostatic capacity of the first capacitor circuit is approximately equal to a combined electrostatic capacity of the second capacitor circuit.

3. The coil device of claim 1 , wherein,
each of the plurality of capacitor elements is composed of a multilayer ceramic capacitor,
and the capacitor circuit comprises a capacitor group in which the plurality of capacitor elements are series-parallel connected.

4. The coil device of claim 1 , wherein,
each of the plurality of capacitor elements is composed of a film capacitor,
and the capacitor circuit comprises a plurality of capacitor portions in which the plurality of capacitor elements are connected in series.

5. A wireless power transmission device comprising,
a wireless power feeding device including a power feeding coil device, and
a wireless power receiving device including a power receiving coil device,
at least one of the power feeding coil device and the power receiving coil device is the coil device of claim 1 .

6. The coil device of claim 2 , wherein,
each of the plurality of capacitor elements is composed of a multilayer ceramic capacitor,
and the capacitor circuit comprises a capacitor group in which the plurality of capacitor elements are series-parallel connected.

7. The coil device of claim 2 , wherein,
each of the plurality of capacitor elements is composed of a film capacitor,
and the capacitor circuit comprises a plurality of capacitor portions in which the plurality of capacitor elements are connected in series.

8. A wireless power transmission device comprising,
a wireless power feeding device including a power feeding coil device, and
a wireless power receiving device including a power receiving coil device,
at least one of the power feeding coil device and the power receiving coil device is the coil device of claim 2 .

9. A wireless power transmission device comprising,
a wireless power feeding device including a power feeding coil device, and
a wireless power receiving device including a power receiving coil device,
at least one of the power feeding coil device and the power receiving coil device is the coil device of claim 3 .

10. A wireless power transmission device comprising,
a wireless power feeding device including a power feeding coil device, and
a wireless power receiving device including a power receiving coil device,
at least one of the power feeding coil device and the power receiving coil device is the coil device of claim 6 .

11. A wireless power transmission device comprising,
a wireless power feeding device including a power feeding coil device, and
a wireless power receiving device including a power receiving coil device,
at least one of the power feeding coil device and the power receiving coil device is the coil device of claim 4 .

12. A wireless power transmission device comprising,
a wireless power feeding device including a power feeding coil device, and
a wireless power receiving device including a power receiving coil device,
at least one of the power feeding coil device and the power receiving coil device is the coil device of claim 7 .

Assignees

• Tdk Corp

Inventors

• Fukuzawa Narutoshi
• Sato Ayako
• Saen Tsunehiro

Classifications

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J50/70

  involving the reduction of electric, magnetic or electromagnetic leakage fields · CPC title

• G01R31/64

  Testing of capacitors · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• B60L53/12

  Inductive energy transfer · CPC title