Opinions on Qi, wireless charging of mobile phones etc. - diyAudio
Go Back   Home > Forums > General Interest > Everything Else
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 2nd January 2013, 11:56 AM   #1
diyAudio Member
Join Date: Apr 2012
Location: Kiel, Germany
Default Opinions on Qi, wireless charging of mobile phones etc.

With the new Nokia Lumia and the JBL Powerup I read more and more about wireless charging and the Qi standard.
It seems that in a few years we will all have our little (5W to 10W) inductive transmitters in the living room and in all kinds of public places.
I was not able to find out which freuquency they will be using.
The idea seems to be to have the transmitter running 24/7 with a moderate standby consumption and energy transfer only taking place when a receiver (coil) is placed in the near field.
How many new power plants will we need to power all these standby consumers?
What happens if I place some metal structure in the near field? Say, a wrist watch or a can of beverage? Eddy currents?
"People with pacemakers please do not enter this café. We have have alternating magnetic fields in here."
When is the first vinyl fan going to complain that his phono pre picks up some strange signals?
  Reply With Quote
Old 2nd January 2013, 12:05 PM   #2
diyAudio Member
Join Date: Apr 2012
Location: Kiel, Germany
Operating frequency is 112kHz to 205kHz. So not very far from the audio band.
Parasitic objects can be detected by the transmitter. A cell-phone will communicate with the transmitter when charged. If energy is lost (due to a metal object) and no comms are established, the transmitter will switch off again.
  Reply With Quote
Old 2nd January 2013, 12:43 PM   #3
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
You probably won't get much energy transfer unless the 'receiver' is resonant, so accidental transfer is unlikely. However, it still seems an inefficient way to charge a battery. People will happily pay for convenience, whatever the energy/financial/ecological cost.

Like everything else we encounter, the electromagnetic spectrum is being steadily polluted by humans and so is rendered less useful than it otherwise could be.
  Reply With Quote
Old 2nd January 2013, 02:23 PM   #4
diyAudio Member
Join Date: Apr 2012
Location: Kiel, Germany
It is interesting how the manage to steal energy from the resonant tank in the receiver. TI are making chips.
  Reply With Quote
Old 2nd January 2013, 03:56 PM   #5
diyAudio Member
firechief's Avatar
Join Date: Sep 2008
Location: Near Seattle Wa
A similar prototype application I worked on involved the charging of batteries inside the human body. These powered a Left Ventricular Assist Device or LVAD that took over part of the function of the human heart. The introduction of any wires into a body results in a serious problem of infection so the designed used low frequency AC charging. Personally I dont like the idea of having batteries in my chest but money was being spent to on the idea. Go figure.
"You can keep your insurance baby nothing is guaranteed" -Tom Petty
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Android based mobile phones as portable music player. rrrremus Digital Source 4 14th September 2011 11:45 AM
What is a virtual machine? (Re: Mobile Phones) rtarbell Everything Else 6 4th January 2010 12:27 AM
Filter RF interference from mobile phones joydivision Chip Amps 0 2nd October 2008 06:39 PM

New To Site? Need Help?

All times are GMT. The time now is 12:15 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2