TransferJet: Accelerating Wireless Charging

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_hm
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Re: Wireless charging
_hm   1/26/2013 8:09:58 PM
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Thanks for information. I would say it is link efficiency. If wire charger link efficiency is 100%, wireless is 70% or better. This is quite high to my surprise. I would consider it as green. I will employ more wireless charger.

Michell Prunty
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Re: Wireless charging
Michell Prunty   1/26/2013 3:17:05 PM
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@ _hm

How low do you expect the percentage to be?  Here is a link for Toshiba that mentions their (74%) efficiency: http://www.toshiba.com/taec/news/press_releases/2012/wrls_12_656.jsp

EVWireless is the company that claims a 90% efficiency, though that is for electric vehicle wireless charging. The efficiency rate depends on what the manufacturer uses to replace the copper coils with.

I haven't been able to do an in-person comparison of wired vs wireless, so maybe someone who has can chime in which actual charging times. 

The reason why wireless charging could be considered "green" is that as we add in more coils for more devices, the standby power remains the same vs the scenario where we have 2+ adapters kept constantly plugged in for 2x the standby power consumption. 

pocharle
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Re: Wireless charging
pocharle   1/26/2013 11:43:40 AM
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I agree. The health implications are a huge factor.

_hm
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Re: Wireless charging
_hm   1/26/2013 7:51:34 AM
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@Prunty: This looks quite misguiding numbers! Please check with manufacturer. For your information, dc/dc converter also has efficiency close to 90%. Please check again efficienct must be much lower.

 

Michell Prunty
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Re: Wireless charging
Michell Prunty   1/25/2013 6:29:27 PM
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Hi all,

Regarding efficiency, this system can be 75% efficient, though it does depend on which components the manufacturer uses.  Some vendors are claiming up to 90% efficiency.  Considering how young this market is, its kind of remarkable.

Also - these products do work with Qi, the standard for wireless charging developed by the WPC

_hm
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Re: Wireless charging
_hm   1/24/2013 8:09:23 PM
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Is it possible to get the efficiency of this wireless charger? Also, health hazard may be hidden and some prominent third party must get it certified.

 

Bolaji Ojo
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Re: Wireless charging
Bolaji Ojo   1/24/2013 9:54:53 AM
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Remember asbestos? People weren't aware it was really dangerous until years later. However, constant monitoring of people's health might have given us earlier the first hints about the dangers involved.

This is happening today with wireless devices. The industry has trade bodies that have conducted research into this and said it is not harmful but more research is being done by academic bodies and others. Stay alert but so far so good.

mfbertozzi
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Wireless spectrum
mfbertozzi   1/24/2013 8:27:23 AM
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@H_H: not so easy a proper answer; in order to share more our opinion about, I can report a recent prediction from Deloitte that focuses on the wireless spectrum crunch...

Hospice_Houngbo
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Re: Wireless charging
Hospice_Houngbo   1/24/2013 6:55:52 AM
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@Mr. Roques,

"I'm more worried about cellphones near my head. Which frequencies are more dangerous?"

There is no serious proof to support that assumption. We don't reaally know whether cellphone radiations are harmful or not. But I do agree that we should be aware that a long exposure to radio frequencies over time can have a harmful effect.

Hospice_Houngbo
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Re: Wireless charging
Hospice_Houngbo   1/24/2013 6:43:25 AM
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@_hm,

"Wireless charging is quite inefficient and may not be consider green tech."

It is true that we are far from "cutting the power cable". But we can't deny that there have been some (good) improvements in wireless charging research and transfertJet is just one step closer to implementing wireless charging functionality on mobile devices.

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