Tire monitoring sensor, system and conrol method thereof, and vehicle having the same
US-2024416687-A1 · Dec 19, 2024 · US
Wireless power transfer system
US12597805B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12597805-B2 |
| Application number | US-202418804204-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 14, 2024 |
| Priority date | Feb 18, 2022 |
| Publication date | Apr 7, 2026 |
| Grant date | Apr 7, 2026 |
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Abstract
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A wireless power transfer system includes a cavity resonator entirely surrounded by an electromagnetic wave shielding member having appropriate conductivity and frequency selectivity; at least one power reception unit; at least one power transmission unit; and at least one resonator (e.g., a resonant network). In an equivalent circuit of the wireless power transfer system from a power transmission circuit of the power transmission unit to a power reception circuit of the power reception unit, N (N≥2) resonators including the cavity resonator are connected in series via an inverter on a power transmission route from the power transmission circuit to the power reception circuit.
First claim
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What is claimed is: 1 . A wireless power transfer system comprising: a cavity resonator entirely surrounded by an electromagnetic wave shield having appropriate conductivity and frequency selectivity; at least one power receiver; at least one power transmitter; and at least one resonator, wherein in an equivalent circuit of the wireless power transfer system from a power transmission circuit of the power transmitter to a power reception circuit of the power receiver, N (N≥2) resonators including the cavity resonator are connected in series via an inverter on a power transmission route from the power transmission circuit to the power reception circuit, and the at least one resonator includes one or more resonators between the cavity resonator and the power transmission circuit. 2 . A wireless power transfer system comprising: a cavity resonator entirely surrounded by an electromagnetic wave shield having appropriate conductivity and frequency selectivity; at least one power receiver; at least one power transmitter; and at least one resonator, wherein in an equivalent circuit of the wireless power transfer system from a power transmission circuit of the power transmitter to a power reception circuit of the power receiver, N (N≥2) resonators including the cavity resonator are connected in series via an inverter on a power transmission route from the power transmission circuit to the power reception circuit, and the at least one resonator includes one or more resonators between the cavity resonator and the power reception circuit, and also includes one or more resonators between the cavity resonator and the power transmission circuit, thus satisfying N≥3. 3 . The wireless power transfer system according to claim 1 , wherein the at least one resonator excluding the cavity resonator is an LC parallel resonator. 4 . The wireless power transfer system according to claim 1 , wherein when the cavity resonator is an m th resonator counted from the power transmitter side, a shunt element between the power transmission circuit and an (m+1) th resonator is grounded to the cavity resonator, and a shunt element in a region from the (m+1) th resonator to the power reception circuit is connected to the ground of the power receiver. 5 . The wireless power transfer system according to claim 1 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2. 6 . The wireless power transfer system according to claim 2 , wherein the at least one resonator excluding the cavity resonator is an LC parallel resonator. 7 . The wireless power transfer system according to claim 2 , wherein when the cavity resonator is an m th resonator counted from the power transmitter side, a shunt element between the power transmission circuit and an (m+1) th resonator is grounded to the cavity resonator, and a shunt element in a region from the (m+1) th resonator to the power reception circuit is connected to the ground of the power receiver. 8 . The wireless power transfer system according to claim 3 , wherein when the cavity resonator is an m th resonator counted from the power transmitter side, a shunt element between the power transmission circuit and an (m+1) th resonator is grounded to the cavity resonator, and a shunt element in a region from the (m+1) th resonator to the power reception circuit is connected to the ground of the power receiver. 9 . The wireless power transfer system according to claim 6 , wherein when the cavity resonator is an m th resonator counted from the power transmitter side, a shunt element between the power transmission circuit and an (m+1) th resonator is grounded to the cavity resonator, and a shunt element in a region from the (m+1) th resonator to the power reception circuit is connected to the ground of the power receiver. 10 . The wireless power transfer system according to claim 2 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2. 11 . The wireless power transfer system according to claim 3 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2. 12 . The wireless power transfer system according to claim 4 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2. 13 . The wireless power transfer system according to claim 6 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2. 14 . The wireless power transfer system according to claim 7 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2. 15 . The wireless power transfer system according to claim 8 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2. 16 . The wireless power transfer system according to claim 9 , wherein a conductor line of the power receiver and a conductor line of the power transmitter are each open-ended at one end, and a product of a phase constant β and a conductor line length L is smaller than π/2.
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- What does patent US12597805B2 cover?
- A wireless power transfer system includes a cavity resonator entirely surrounded by an electromagnetic wave shielding member having appropriate conductivity and frequency selectivity; at least one power reception unit; at least one power transmission unit; and at least one resonator (e.g., a resonant network). In an equivalent circuit of the wireless power transfer system from a power transmiss…
- Who is the assignee on this patent?
- Murata Mfg Co Ltd, National Univ Corporation Toyohashi Univ Of Technology
- What technology area does this patent fall under?
- Primary CPC classification H02J50/12. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 07 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).