Wireless power transmission system and power receiver

Patent metadata

Field	Value
Publication number	US-2024106277-A1
Application number	US-202318528334-A
Country	US
Kind code	A1
Filing date	Dec 4, 2023
Priority date	Jul 19, 2021
Publication date	Mar 28, 2024
Grant date	—

Abstract

A wireless power transmission system includes a structure surrounded as a whole by an electromagnetic wave-shielding member having an appropriate conductivity, at least one power transmission unit, and at least one power reception unit. A power reception unit includes a power receiver including a dielectric substrate, a rectifier circuit, and a power reception antenna. The power reception antenna includes power reception antenna lines in a same plane on the dielectric substrate. One ends of the power reception antenna lines are connected to the rectifier circuit, and other ends different from the one ends connected to the rectifier circuit are open ends. A planar shape of the dielectric substrate is a 2N-sided polygon with line symmetry (where N is an integer of two or more), and the power reception antenna lines are along N sides that are adjacent to and different from each other of the dielectric substrate.

First claim

What is claimed is:

1 . A wireless power transmission system comprising:
a structure surrounded as a whole by an electromagnetic wave-shielding member having an appropriate conductivity; at least one power transmission unit; and at least one power reception unit, the wireless power transmission system being configured to use a resonant mode in the structure, wherein the power reception unit includes a power receiver including a dielectric substrate, a rectifier circuit, and a power reception antenna, wherein the power reception antenna includes a power reception antenna line in a same plane on the dielectric substrate, one end of the power reception antenna line is connected to the rectifier circuit, of the power reception antenna line, another end different from the one end connected to the rectifier circuit is an open end, a planar shape of the dielectric substrate is a 2N-sided polygon with line symmetry, where N is an integer of two or more, and the power reception antenna line is along N sides that are adjacent to and different from each other of the dielectric substrate.

2 . The wireless power transmission system according to claim 1 , wherein
the planar shape of the dielectric substrate is a rectangle, and the power reception antenna line is along two sides that are adjacent to and different from each other of the dielectric substrate.

3 . The wireless power transmission system according to claim 1 , wherein
the power reception antenna includes two power reception antenna lines, each of which is the power reception antenna line, along a periphery of the dielectric substrate, and other ends of the respective power reception antennas are at different sides of the dielectric substrate.

4 . The wireless power transmission system according to claim 1 , wherein
the power reception antenna includes one power reception antenna line, which is the power reception antenna line, along a periphery of the dielectric substrate.

5 . The wireless power transmission system according to claim 1 , wherein
the power transmission unit is configured to be supplied with power in a monopole mode.

6 . The wireless power transmission system according to claim 5 , wherein
the power transmission unit includes a microstrip antenna.

7 . The wireless power transmission system according to claim 1 , wherein
the power receiver further includes a helical antenna on the dielectric substrate, and the helical antenna is electrically connected to the power reception antenna line at the other end of the power reception antenna line or in a vicinity of the other end.

8 . The wireless power transmission system according to claim 1 , wherein
the power receiver further includes a three-dimensional antenna in a direction orthogonal to the dielectric substrate, and the three-dimensional antenna is electrically connected to the power reception antenna line at the other end of the power reception antenna line or in a vicinity of the other end.

9 . The wireless power transmission system according to claim 1 , wherein
the power receiver further includes a helical antenna on the dielectric substrate, and a three-dimensional antenna in a direction orthogonal to the dielectric substrate, and the helical antenna and the three-dimensional antenna are electrically connected to the respective power reception antenna lines at the other ends of the respective power reception antenna lines or in vicinities of the other ends.

10 . The wireless power transmission system according to claim 7 , wherein
a central axis of the helical antenna is orthogonal to a direction in which the power reception antenna line extends.

11 . The wireless power transmission system according to claim 2 , wherein
the power reception antenna includes two power reception antenna lines, each of which is the power reception antenna line, along a periphery of the dielectric substrate, and other ends of the respective power reception antennas are at different sides of the dielectric substrate.

12 . The wireless power transmission system according to claim 2 , wherein
the power reception antenna includes one power reception antenna line, which is the power reception antenna line, along a periphery of the dielectric substrate.

13 . A power receiver of a wireless power transmission system, the wireless power transmission system including a structure surrounded as a whole by an electromagnetic wave-shielding member having an appropriate conductivity, at least one power transmission unit, and at least one power reception unit and that is configured to use a resonant mode in the structure, the power receiver being configured in the power reception unit, and the power receiver comprising:
a dielectric substrate; a rectifier circuit; and a power reception antenna, wherein the power reception antenna includes a power reception antenna line in a same plane on the dielectric substrate, one end of the power reception antenna line is connected to the rectifier circuit, of the power reception antenna line, another end different from the one end connected to the rectifier circuit is an open end, a planar shape of the dielectric substrate is a 2N-sided polygon with line symmetry, where N is an integer of two or more, and the power reception antenna line is along N sides that are adjacent to and different from each other of the dielectric substrate.

14 . The power receiver according to claim 13 , wherein
the planar shape of the dielectric substrate is a rectangle, and the power reception antenna line is along two sides that are adjacent to and different from each other of the dielectric substrate.

15 . The power receiver according to claim 13 , wherein
the power reception antenna includes two power reception antenna lines, each of which is the power reception antenna line, along a periphery of the dielectric substrate, and other ends of the respective power reception antennas are at different sides of the dielectric substrate.

16 . The power receiver according to claim 13 , wherein
the power reception antenna includes one power reception antenna line, which is the power reception antenna line, along a periphery of the dielectric substrate.

17 . The power receiver according to claim 13 , further comprising:
a helical antenna on the dielectric substrate, wherein the helical antenna is electrically connected to the power reception antenna line at the other end of the power reception antenna line or in a vicinity of the other end.

18 . The power receiver according to claim 13 , further comprising:
a three-dimensional antenna in a direction orthogonal to the dielectric substrate, wherein the three-dimensional antenna is electrically connected to the power reception antenna line at the other end of the power reception antenna line or in a vicinity of the other end.

19 . The power receiver according to claim 13 , further comprising:
a helical antenna on the dielectric substrate; and a three-dimensional antenna disposed in a direction orthogonal to the dielectric substrate, wherein the helical antenna and the three-dimensional antenna are electrically connected to the respective power reception antenna lines at the other ends of the respective power reception antenna lines or in vicinities of the other ends.

20 . The power receiver according to claim 17 , wherein
a central axis of the helical antenna is orthogonal to a direction in which the power reception antenna line extends.

Assignees

• Murata Manufacturing Co

Inventors

• Saeki Hiromasa

Classifications

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J50/005

  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

• H02J50/402

  the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas · CPC title

• H01Q11/08

  Helical antennas · CPC title

• H01Q9/30

  with feed to end of elongated active element, e.g. unipole (H01Q9/44 takes precedence) · CPC title