Author Topic: The uBeam FAQ  (Read 284315 times)

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Offline StillTrying

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Re: The uBeam FAQ
« Reply #1175 on: February 06, 2018, 12:26:18 am »
« Last Edit: February 09, 2018, 09:02:23 am by StillTrying »
 

Offline StillTrying

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Re: The uBeam FAQ
« Reply #1176 on: March 10, 2018, 01:00:34 am »

Offline Howardlong

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Re: The uBeam FAQ
« Reply #1177 on: March 10, 2018, 01:35:32 am »
Ubean decide to try and make PC/mac speakers instead, probably. :horse:

https://twitter.com/meredithperry/status/971321838654705665

https://pbs.twimg.com/media/DXrUDzzWkAEpTlN.jpg

Looks like the air in front of it has gone non-linear.
 

Offline LaserSteve

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Re: The uBeam FAQ
« Reply #1178 on: March 10, 2018, 08:17:46 am »
Too bad its not a blurred video so we could de-convolve it. :-(

Steve
"I've Never Heard of a Nuclear Meltdown Caused by a Buffer Overflow"  filssavi
 

Offline EEVblog

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Re: The uBeam FAQ
« Reply #1179 on: March 16, 2018, 09:14:39 am »
https://www.linkedin.com/in/larrypendergrass/

Another CTO of uBeam has left, for Keysight this time where real practical engineering happens  :-DD

At least he lasted 17 months, that's impressive.
 

Offline Howardlong

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Re: The uBeam FAQ
« Reply #1180 on: March 16, 2018, 09:27:32 pm »
https://www.linkedin.com/in/larrypendergrass/

Another CTO of uBeam has left, for Keysight this time where real practical engineering happens  :-DD

At least he lasted 17 months, that's impressive.

If I were him I'd be very glad to be putting the nonsense behind me, and count myself lucky to be getting back into the real engineering left behind six years ago.
 

Offline Howardlong

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Re: The uBeam FAQ
« Reply #1181 on: March 17, 2018, 05:42:07 pm »
About Theranos, an interesting parallel:

Quote
The SEC summed up what was wrong with Ms Holmes and Theranos in a damning report: "Innovators who seek to revolutionise and disrupt an industry must tell investors the truth about what their technology can do today - not just what they hope it might do someday."

http://www.bbc.co.uk/news/business-43415967

 

Offline Fungus

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Re: The uBeam FAQ
« Reply #1182 on: March 19, 2018, 06:47:02 pm »
Which part of the word "show" am I failing to understand?  :popcorn:





« Last Edit: March 19, 2018, 06:48:45 pm by Fungus »
 

Offline StillTrying

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Re: The uBeam FAQ
« Reply #1183 on: March 24, 2018, 11:27:18 pm »

Offline Cyberdragon

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Re: The uBeam FAQ
« Reply #1184 on: March 25, 2018, 02:20:22 am »
https://twitter.com/meredithperry/status/977102334294605824  :horse:

Translate(str)

Translating:

Hello, we would like to rot more women's brains to decrease the overall intelligence of the female population.

 :palm:
*BZZZZZZAAAAAP*
Voltamort strikes again!
Explodingus - someone who frequently causes accidental explosions
 

Offline Raj

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Re: The uBeam FAQ
« Reply #1185 on: April 17, 2018, 01:53:19 pm »
here's it's copycat-Kill it before it spwans- http://www.wi-charge.com/
 :palm: :scared: :-BROKE
they're trying to seek indian citizen's funding.kill it before that.
« Last Edit: April 18, 2018, 08:42:09 pm by Raj »
 

Online Dubbie

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Re: The uBeam FAQ
« Reply #1186 on: April 17, 2018, 03:08:07 pm »
At least they specify what power they claim to deliver over what distance.
 

Offline Howardlong

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Re: The uBeam FAQ
« Reply #1187 on: April 17, 2018, 07:50:03 pm »
The video showed a phone sleeve with about a 2cm^2 aperture.

Assuming maximum IR is 1kW/m^2, then you'll get 0.2W into a 2cm^2 aperture, but then their own white paper says you need 2W to power a smartphone. That 2W I'd say is too high.

Looking at it another way, 0.2W is about 70mA of charging current. A common battery capacity of a phone is 2400mAh, so it'd take 34 hours to charge, assuming the phone wasn't taking any juice in standby, and that it would even consider charging at that rate.

Let's be generous and say a 2400mAh battery lasts about 10 days in standby, or 240 hours, so the phone standby current draw is 10mA, so net charging current is 60mA, or a 40 hour charge time in standby.

I'm sceptical that this charging rate is enough to gain general acceptance for the prime use case of call phones, but it seems a more practical and cheaper solution compared to uBeam, although I don't know how their beamforming works, I assume it'd be with mechanically adjusted lenses, which begs the question about the complexity for multiple targets.

If on the other hand it used a sleeve with a 5cm x 10 cm aperture on the back of the device, the charge rate would by 25 times that of a 2cm^2 aperture shown in the video, leading to a far more respectable 1.6 hour charge time.

Irrespective, just like uBeam and Energous, I'd say they're a very long way from delivering a useful practical product that fits the significant market they've hoodwinked their investors with.
 

Offline PA0PBZ

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Re: The uBeam FAQ
« Reply #1188 on: April 17, 2018, 09:07:27 pm »
And how do you use it? To power a Qi pad of course!  :-DD

Keyboard error: Press F1 to continue.
 

Offline Daixiwen

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Re: The uBeam FAQ
« Reply #1189 on: April 17, 2018, 11:31:02 pm »
Your calculation also assumes that the receiver is perfectly angled with the transmitter. With the use case they show, phone flat on the table, sender somewhere over the kitchen bench, you'll have less power available per unit of surface.
I really don't get how they can say they send 2W of power on such small surfaces and still pretend it's safe. I'd never try and put my hand between the phone and the sender. (I'll admit it's not a common use case... unless you'd like to.... pick up your phone for example?)
 

Offline Howardlong

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Re: The uBeam FAQ
« Reply #1190 on: April 18, 2018, 01:04:07 am »
Your calculation also assumes that the receiver is perfectly angled with the transmitter. With the use case they show, phone flat on the table, sender somewhere over the kitchen bench, you'll have less power available per unit of surface.
I really don't get how they can say they send 2W of power on such small surfaces and still pretend it's safe. I'd never try and put my hand between the phone and the sender. (I'll admit it's not a common use case... unless you'd like to.... pick up your phone for example?)

Indeed, I agree, I was deliberately giving them the benefit of the doubt! The point is is if it isn't practical in even the best case scenarios, it's a non-starter, unless the point is to extract money from poorly informed or educated investors.

The modus operandi is exactly the same as we've seen before, promise the world on a stick, with fancy marketing and well produced videos, but be permanently just 18 months off from being production ready with what you promised.
 

Offline Raj

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Re: The uBeam FAQ
« Reply #1191 on: April 18, 2018, 08:43:25 pm »
still,even if it's 0.2wt laser,the most efficient solar cell is only efficient upto 44%
and what happens if the laser bending mechanism fails or someone somehow gets his face in the path of laser without the machine noticing it?
 

Offline EEVblog

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Re: The uBeam FAQ
« Reply #1192 on: April 18, 2018, 08:56:03 pm »
The modus operandi is exactly the same as we've seen before, promise the world on a stick, with fancy marketing and well produced videos, but be permanently just 18 months off from being production ready with what you promised.

You can live full time for many years on someone else's dime like this. Then when it fails, rinse and repeat using your new found fame like Meredith's. After all, wasn't she supposed to be the next Elon Musk?
http://fortune.com/2015/07/29/ubeam-meredith-perry-wireless-charging/
I mean, it's Fortune magazine...
 

Offline EEVblog

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Re: The uBeam FAQ
« Reply #1193 on: April 30, 2018, 06:18:00 pm »
More bragging on twitter.
New VP of Engineering:
https://www.linkedin.com/in/larry-starr-2328706/
And a whole host of new hires it seems, burning through the new cash in the pointless pursuit of ultrasonic charging  ::)

https://twitter.com/meredithperry/status/990279009228369920

The attentive eye will note that they aren't the size arrays, so size comparisons are kinda  :palm:





« Last Edit: April 30, 2018, 06:19:43 pm by EEVblog »
 

Offline NANDBlog

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Re: The uBeam FAQ
« Reply #1194 on: May 01, 2018, 04:02:37 am »
https://twitter.com/meredithperry/status/977102334294605824  :horse:

Translate(str)

Translating:

Hello, we would like to rot more women's brains to decrease the overall intelligence of the female population.

 :palm:
Isn't hiring based on gender illegal in the USA anyway?
It would be nice to bring down SJWs with their own weapons in a courtroom.
 
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Offline jancumps

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Re: The uBeam FAQ
« Reply #1195 on: May 01, 2018, 04:13:12 am »
.....


Isn't hiring based on gender illegal in the USA anyway?
It would be nice to bring down SJWs with their own weapons in a courtroom.

Aw com'on, this is a technology debunking thread on an engineering forum. Over tired of trying to pull them into non-techno directions. The blog suffers from it.
 
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Offline Cerebus

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Re: The uBeam FAQ
« Reply #1196 on: May 01, 2018, 05:02:50 am »
.....


Isn't hiring based on gender illegal in the USA anyway?
It would be nice to bring down SJWs with their own weapons in a courtroom.

Aw com'on, this is a technology debunking thread on an engineering forum. Over tired of trying to pull them into non-techno directions. The blog suffers from it.

It does get a bit wearing doesn't it.

I've often wondered if the people who like to moan about "SJWs" at every turn would quieten down if we pointed out at every opportunity that the natural counterpart to the SJW must be the Anti-social Injustice Coward?  >:D
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline EEVblog

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Re: The uBeam FAQ
« Reply #1197 on: May 01, 2018, 09:13:00 pm »
Aw com'on, this is a technology debunking thread on an engineering forum. Over tired of trying to pull them into non-techno directions. The blog suffers from it.

What does that mean?
 

Offline Cerebus

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Re: The uBeam FAQ
« Reply #1198 on: May 01, 2018, 11:21:58 pm »
Aw com'on, this is a technology debunking thread on an engineering forum. Over tired of trying to pull them into non-techno directions. The blog suffers from it.

What does that mean?

I read that as a slip and assumed, just from context, they meant 'forum' rather than 'blog'.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline jancumps

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Re: The uBeam FAQ
« Reply #1199 on: May 02, 2018, 12:21:28 am »
yes, the forum. I meant to say the EEVblog forum, then goofed up :)
 


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