Foreign object detection in a wireless power transfer system
US-2024372410-A1 · Nov 7, 2024 · US
Wireless power feeder and wireless power transmission system
US9058928B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9058928-B2 |
| Application number | US-97989610-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 28, 2010 |
| Priority date | Dec 14, 2010 |
| Publication date | Jun 16, 2015 |
| Grant date | Jun 16, 2015 |
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Abstract
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A wireless power feeder 116 feeds power from a feeding coil L 2 to a receiving coil L 3 by wireless based on a magnetic field resonance phenomenon between the feeding coil L 2 and receiving coil L 3 . A power transmission control circuit 200 supplies AC current at a drive frequency fo to the feeding coil L 2 . The feeding coil L 2 outputs AC power in substantially a non-resonant state with respect to circuit elements on the power feeding side. Then, power is supplied to a receiving coil circuit 130 by a magnetic field resonance between the feeding coil L 2 and receiving coil L 3.
First claim
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What is claimed is: 1. A wireless power feeder comprising: a feeding coil, to which no capacitor is connected, is magnetically coupled to a receiving coil; a power transmission control circuit that supplies AC power at a drive frequency to the feeding coil and controls the drive frequency; and a phase detection circuit that detects the phase difference between voltage and current phases of the AC power, wherein the feeding coil forms a resonance circuit together with the rec…
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- What does patent US9058928B2 cover?
- A wireless power feeder 116 feeds power from a feeding coil L 2 to a receiving coil L 3 by wireless based on a magnetic field resonance phenomenon between the feeding coil L 2 and receiving coil L 3 . A power transmission control circuit 200 supplies AC current at a drive frequency fo to the feeding coil L 2 . The feeding coil L 2 outputs AC power in substantially a non-resonant state w…
- Who is the assignee on this patent?
- Urano Takashi, Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F38/14. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 16 2015 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).