System and method for detecting and characterizing an object for wireless charging
US-2017033591-A1 · Feb 2, 2017 · US
Wireless power transmitter and method of error detection during use thereof
US10673249B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10673249-B2 |
| Application number | US-201916439943-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 13, 2019 |
| Priority date | Oct 2, 2014 |
| Publication date | Jun 2, 2020 |
| Grant date | Jun 2, 2020 |
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- Title
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Abstract
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A method of detecting a foreign object presence between a wireless power transmitter and a wireless power receiver, the wireless power transmitter comprising a primary coil for transferring power wirelessly to a secondary coil of the wireless power receiver, comprises: transmitting a calibration ping signal; measuring and recording decay time of the calibration ping signal; transmitting test ping signal; measuring and recording decay time of the test ping signal; and determining the foreign object presence if the decay time of the test ping signal is smaller than decay time of the calibration ping signal and if an absolute value of a difference between them is above a threshold. In addition, or alternatively, a self-frequency of a decaying calibration ping signal is measured and recorded; a self-frequency of a decaying test ping signal is measured and recorded; and the foreign object presence is determined if a difference between the self-frequency of the decaying test ping signal and the self-frequency of the decaying calibration ping signal falls outside a predetermined value.
First claim
Opening claim text (preview).
We claim: 1. A method of detecting a foreign object presence between a wireless power transmitter and a wireless power receiver, said wireless power transmitter comprising a primary coil for transferring power wirelessly to a secondary coil of said wireless power receiver, the method comprising: transmitting a calibration ping signal; measuring and recording decay time of said calibration ping signal; transmitting test ping signal; measuring and recording decay time of said test ping signal; and determining said foreign object presence if the decay time of said test ping signal is smaller than decay time of said calibration ping signal and if a value of a difference between them is above a threshold. 2. A method of detecting a foreign object presence between a wireless power transmitter and a wireless power receiver, said wireless power transmitter comprising a primary coil for transferring power wirelessly to a secondary coil of said wireless power receiver, the method comprising: transmitting a calibration ping signal; measuring and recording a self-frequency of a decaying said calibration ping signal; transmitting test ping signal; measuring and recording a self-frequency of a decaying said test ping signal; and determining said foreign object presence if a difference between the self-frequency of the decaying said test ping signal and the self-frequency of the decaying said calibration ping signal falls outside a predetermine value.
Assignees
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Classifications
Electricity · mapped topic
Electricity · mapped topic
- H02J5/005Primary
Electricity · mapped topic
Electricity · mapped topic
using inductive coupling · CPC title
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- What does patent US10673249B2 cover?
- A method of detecting a foreign object presence between a wireless power transmitter and a wireless power receiver, the wireless power transmitter comprising a primary coil for transferring power wirelessly to a secondary coil of the wireless power receiver, comprises: transmitting a calibration ping signal; measuring and recording decay time of the calibration ping signal; transmitting test pi…
- Who is the assignee on this patent?
- Powermat Tech Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02J5/005. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 02 2020 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).