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chanj0
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Efficiency of Wireless Charging
chanj0   12/16/2013 1:39:12 PM
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The convenience of wireless charging has drawn a lot of attention. What can be better than drop it off when you need to recharge the device and pick it back up after charging is done. Yet, I always wonder the efficiency. How good it can be?

On the other hands, there was powermat that you can literially drop your device on it to get charge and pick it back up. "Wreless Charging In a Box" lacks the convenience. Does it have better charging efficiency? It might have benefit of fast charging and less EMI problem to deal with. Question is whether you will trade fast charging over convenience if you are keen to wireless charging.

Sanjib.A
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RF Energy Harvestiing?
Sanjib.A   12/16/2013 11:55:52 AM
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"The signals are received by electronics built into the charging device and then converted to DC energy"

I am assuming that the "charging device" mentioned here is some kind of RF energy harvesting device which converts RF energy into charging current. What is the kind of RF signal used? I wonder if the electronic gadgets with these "charging devices" would be capable of harvesting RF energy from mobile phones, wireless devices, radios etc. even when not kept inside those charging boxes...possible?

 

Kinnar
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Keeping Electronics will also become power hungry
Kinnar   12/16/2013 4:00:40 AM
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Till today portable electronics was not consumer power, but with this kind of devices being used for charging batteries will be consuming more power than required individually by the actual portable device. Yes it is better that it removes the charging connectors from the devices but at the same time it is equally required to be economical in terms of power consumption.

krisi
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Re: The Larger Question
krisi   12/15/2013 11:35:49 AM
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I think it is a natural market evolution @Dr Quine...some technologies, standards and companies will eventually die...at this point it is not clear who is the winner, BTW,  the winner might be decided by a consumer company like Starbucks not by the technology company...Kris

Sanjib.A
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Re: heat
Sanjib.A   12/15/2013 6:13:25 AM
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I was going through an article on the same topic and learned that the efficiency of RF transmission would be ~90% and above for this device. So 10% of that would be dissipated as heat? Again some more would be dissipated by the receiver, the charging chip on the device being charged...don't know how much that would be.

DrQuine
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The Larger Question
DrQuine   12/14/2013 9:31:37 PM
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It doesn't matter how many ways we develop to send power to a rechargeable device, we still need to have a compatible receiver on the device end. Just when standards are being set to ensure compatible charging cords for mobile phones, we seem to be spiraling into endless combinations and permutations of wireless charging protocols. Consumers probably just need to step away and allow the competition to play out.

krisi
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Re: heat
krisi   12/13/2013 7:01:50 PM
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I realize RF signals will not escape...but the energy has to go somewhere...and energy transfer is not 100%, actually how high is it?

_hm
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There is always better way!
_hm   12/13/2013 5:43:42 PM
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This is wonderful idea and very suitable application. Kudos to them. This technology will proliferate soon. IEEE should consider working on standard for this. It will be very helpful.

 

_hm
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Re: heat
_hm   12/13/2013 5:40:55 PM
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@Krisi: It is Faraday cage. It will not RF escape.

krisi
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heat
krisi   12/13/2013 3:38:03 PM
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I wonder how much heat is dissipated in the process of charging...can I put my coffee on top on the wireless box to keep it warm?

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