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matthew_mercury
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re: London Calling: Forget wireless charging
matthew_mercury   6/26/2013 1:47:07 AM
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Though in terms of energy efficiency, wireless charging is not that good. Under those cases where energy efficiency is not of major concern, it is still unforgettable. 1) In some situations, we cannot apply contact charging, for example, those electronics embedded in human bodies. To power those devices under these applications, wireless charging is, at least, one of the choices. 2) When a lot of charging devices are considered, the amount of chargers can sometimes be reduced with wireless charging. We need different adaptors for devices of different voltages. A wireless charger only provides the primary side coupling coil while the devices with secondary coils determine the voltages required. This caters for devices with different operating voltages. 3) For wireless charging, no connector and so, no plugging/unplugging mechanical reliability issue. So, a small portion of wireless charging may still be required.

Traces
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re: London Calling: Forget wireless charging
Traces   5/30/2013 6:58:37 PM
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This is dense--a high efficiency heat pump is ~ 300% efficient (It doesn't create heat, it just moves it around). How can a lightbulb compare to this?

Peter Clarke
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re: London Calling: Forget wireless charging
Peter Clarke   3/8/2013 9:28:31 AM
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@tpfj I gave the hard numbers "70 percent to 80 to 85 percent" in the article. Those numbers came from the chairman of the Wireless Power Consortium in October 2012.

Peter Clarke
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re: London Calling: Forget wireless charging
Peter Clarke   3/8/2013 9:24:02 AM
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@resistion No 180 degree turn. I was excited about Splashpower because it was a UK startup and something for me to write about in a novel area. Didn't mean I was going to use the product. Similarly if a company emerged today with an innovative wireless charging offering I would be interested to learn about it and write about it.

EG_RealWorld
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re: London Calling: Forget wireless charging
EG_RealWorld   3/8/2013 4:17:23 AM
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I have designed wireless and it will never be as efficient as wired everything being equal. Wired can more easily detect load and shut itself down. If the manufactures can use a standard for wireless they could create a standard for a couple of common plugs for different power levels. I believe parts of Europe require common chargers for cell phones. Think of all the land fills saved and the energy saved in not making extra chargers. Also no EMI pollution.

tpfj
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re: London Calling: Forget wireless charging
tpfj   3/7/2013 8:21:49 PM
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All of you talk about the inefficiencies, but none have given any hard numbers. You are all going on gut, which is mostly good, but best you get some hard facts from an actual pad or pad company with each of the competing technologies (inductive or resonant, or etc) before you start spouting a religion.

chrisshore
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re: London Calling: Forget wireless charging
chrisshore   3/6/2013 8:55:50 AM
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I came across Splashpower right at the beginning as I used to work with its first first CEO. I agree that the potential of wireless charging seemed fantastic. They were talking about pads in coffee shops, hotels, bars, cars, bedrooms, kitchen worktops etc. The ability to walk into almost any room and drop all my devices on a pad was (and still is) very attractive from a convenience point of view. I think it foundered, and possibly will continue to founder, on two things. One is the need for ubiquitous pads; the other is the need for universal and seamless interworking across products and manufacturers. I suspect that the first will never happen due to the cost and the second because of competing interests. I am happy to be corrected by events on both counts! I admit that I had not considered the "green" aspect before but it is clear that any wireless charging solution is going to be less energy-efficient (for all sorts of reasons - transmission loss and being left on all the time to name but two). Peter's aspiration to used a wired brick and always unplug it when not in use is admirable but 99% of us (myself included) will _never_ do it! Chris

old account Frank Eory
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re: London Calling: Forget wireless charging
old account Frank Eory   3/6/2013 8:36:56 AM
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These things operate at around 100 kHz. You're worried about the health effects of EM waves at 100 kHz? Should we have the same concerns about high power audio amps that operate up to 20 kHz?

resistion
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re: London Calling: Forget wireless charging
resistion   3/6/2013 6:57:48 AM
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Wow, Peter, this is first time I've seen such an explicit 180 from you. There must be a lot of info that's covered up or ignored by marketing then?

Sparky_Watt
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re: London Calling: Forget wireless charging
Sparky_Watt   3/5/2013 11:32:32 PM
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You can't violate the laws of physics. There is no way to wirelessly transfer energy that doesn't leak. And the larger the gap the larger the leak. A charging mat will have a large gap by necessity. And the leak does not become heat, it is a radio wave, that will leave the Earth taking its energy with it. The idea of charging a car or bus from the road scares me, that is a six inch, unsheilded gap! People talk about the convenience of these kinds of things (undoubtedly true), but we already must find an alternative to fossil fuels, and are struggling to find safe energy sources to replace them. We are also struggling to up our infrastructure to allow electricity to take over for fossil fuels. Now you want to add a 20% hit to that?

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