Wireless power transmission system

Patent metadata

Field	Value
Publication number	US-2024022114-A1
Application number	US-202318362692-A
Country	US
Kind code	A1
Filing date	Jul 31, 2023
Priority date	Feb 2, 2021
Publication date	Jan 18, 2024
Grant date	—

Abstract

A wireless power transmission system includes a structure entirely surrounded by an electromagnetic wave shielding member having appropriate conductivity, at least one power transmission unit and at least one power reception unit. The power reception unit is composed of a power receiver including, for example, a power reception antenna wiring line and a rectifier circuit. The power reception antenna wiring line has a wiring structure of two lines which are formed in the same plane and each of which has one end connected to the rectifier circuit, the other ends thereof being open ends which face each other, and the power reception antenna wiring line has a plurality of bent portions in the above wiring structure.

First claim

What is claimed is:

1 . A wireless power transmission system comprising:
a structure entirely surrounded by an electromagnetic wave shielding member having appropriate conductivity, at least one power transmission unit, and at least one power reception unit, wherein the power reception unit comprises a power receiver including a power reception antenna wiring line and a rectifier circuit, the power reception antenna wiring line has a wiring structure of two lines which are in a same plane and each of which has one end connected to the rectifier circuit and another end different from the one end connected to the rectifier circuit, the other ends thereof being open ends which face each other, or a loop-shaped wiring structure of one line which is in a same plane and which has both ends connected to the rectifier circuit, the power reception antenna wiring line having a plurality of bent portions in either wiring structure, when viewed in a direction perpendicular to a direction in which wiring sections divided by the bent portions extend, in three or more pairs of wiring sections, the wiring sections of each pair face each other, among the wiring sections facing each other, wiring portions with a longest facing portion are parallel to each other, and when the respective power reception antenna wiring lines are viewed, a number of bent portions is the same and a number of pairs of wiring sections facing each other on the same wiring line is also the same.

2 . The wireless power transmission system according to claim 1 , wherein
among the wiring sections facing each other, wiring sections with a second longest facing portion are also parallel to each other.

3 . The wireless power transmission system according to claim 1 , wherein
when the power reception antenna wiring line is viewed as being divided into two parts, the number of bent portions is the same and the number of pairs of wiring sections facing each other on the same wiring line is also the same.

4 . The wireless power transmission system according to claim 2 , wherein
when the power reception antenna wiring line is viewed as being divided into two parts, the number of bent portions is the same and the number of pairs of wiring sections facing each other on the same wiring line is also the same.

5 . A wireless power transmission system comprising:
a structure entirely surrounded by an electromagnetic wave shielding member having appropriate conductivity, at least one power transmission unit, and at least one power reception unit, wherein the power transmission unit comprises a power transmitter including a power transmission antenna mounting portion and a power transmission antenna wiring line, the power transmission antenna mounting portion is out of electrical contact with the electromagnetic wave shielding member, the power transmission antenna wiring line has a wiring structure which is inside the structure and parallel to a wall surface made of the electromagnetic wave shielding member and which has one end electrically connected to the power transmission antenna mounting portion and another end that is an open end, the power transmission antenna wiring line having from four to eight bent portions in the wiring structure, when viewed in a direction perpendicular to a direction in which wiring sections divided by the bent portions extend, a wiring section and another wiring section present on the same wiring line are parallel to each other at facing positions, and when observed along a path of the power transmission antenna wiring line from a connection portion with the power transmission antenna mounting portion to the open end, paths of the wiring sections parallel to each other at the facing positions are opposite to each other.

6 . The wireless power transmission system according to claim 5 , wherein
when the power transmission antenna wiring line is viewed from an inside of the structure, an angle θ defined by a first straight line parallel to a floor surface of the structure and a second straight line passing through the connection portion with the power transmission antenna mounting portion and a first bent portion closest to the connection portion satisfies 0°≤θ≤90° or 180°≤θ≤270°.

7 . The wireless power transmission system according to claim 6 , wherein the angle θ satisfies 0°≤θ≤60° or 180°≤θ≤240°.

8 . The wireless power transmission system according to claim 5 , wherein
a first power transmission antenna wiring portion which is a wiring section of the power transmission antenna wiring line from the connection portion with the power transmission antenna mounting portion to a first bent portion closest to the connection portion is parallel to any wall surface of wall surfaces of the structure other than a wall surface on which the power transmission antenna mounting portion is installed, and a second power transmission antenna wiring portion which is a wiring section of the power transmission antenna wiring line from the first bent portion to a second bent portion closest to the connection portion after the first bent portion is parallel to any wall surface of the wall surfaces of the structure other than the wall surface on which the power transmission antenna mounting portion is installed and the wall surface parallel to the first power transmission antenna wiring portion.

9 . The wireless power transmission system according to claim 6 , wherein
a first power transmission antenna wiring portion which is a wiring section of the power transmission antenna wiring line from the connection portion with the power transmission antenna mounting portion to a first bent portion closest to the connection portion is parallel to any wall surface of wall surfaces of the structure other than a wall surface on which the power transmission antenna mounting portion is installed, and a second power transmission antenna wiring portion which is a wiring section of the power transmission antenna wiring line from the first bent portion to a second bent portion closest to the connection portion after the first bent portion is parallel to any wall surface of the wall surfaces of the structure other than the wall surface on which the power transmission antenna mounting portion is installed and the wall surface parallel to the first power transmission antenna wiring portion.

10 . The wireless power transmission system according to claim 7 , wherein
a first power transmission antenna wiring portion which is a wiring section of the power transmission antenna wiring line from the connection portion with the power transmission antenna mounting portion to a first bent portion closest to the connection portion is parallel to any wall surface of wall surfaces of the structure other than a wall surface on which the power transmission antenna mounting portion is installed, and a second power transmission antenna wiring portion which is a wiring section of the power transmission antenna wiring line from the first bent portion to a second bent portion closest to the connection portion after the first bent portion is parallel to any wall surface of the wall surfaces of the structure other than the wall surface on which the power transmission antenna mounting portion is installed and the wall surface parallel to the first power transmission antenna wiring portion.

Assignees

• Murata Manufacturing Co

Inventors

• Saeki Hiromasa

Classifications

• H02J50/005 Primary

  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 title

• H02J50/20 Primary

  using microwaves or radio frequency waves · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H01Q7/00

  Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop · CPC title

• H02J50/70

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