Qi wireless power specification to standardize wireless charging


July 27, 2010

The finalization of the Qi low power standard means products sporting the Qi logo could soon be appearing in stores

The finalization of the Qi low power standard means products sporting the Qi logo could soon be appearing in stores

As the number of portable electronic devices we carry around has multiplied, so too have the chargers we need to keep them running. Over the last couple of years wireless chargers such as the PowerDisc and Powermat have started popping up to save users the hassle of dealing with a mass of charger cables, but these require specific adapters for the different devices being charged. A business alliance of 20 firms has banded together to form the Wireless Power Consortium (WPC) to develop open standards for wireless charging and has just finalized its Qi low power standard that is aimed at delivering wireless charging stations that can charge a range of compatible devices.

Based on the principle of magnetic induction, wireless charging technology allows power to be transmitted efficiently to devices over short distances – a couple of centimeters. The Qi low power standard delivers up to 5 Watts into wireless power receivers, which should be enough for most portable consumer devices, such as those charged via USB ports which max out at 2.5W.

The Qi power specification consists of three documents with the first currently available only to consortium members. However, it will be made publicly available as a free download on August 30, 2010. This document defines the interface for contactless power transfer between a power transmitter and a power receiver, based on near field magnetic induction between coils.

The test specification will be used to determine whether a product is compliant or not. Only products that pass muster and work according to the specification will be able to carry the Qi logo, which is designed to give consumers a simple way to determine which products will work together.

“Our customers will see the Qi logo and know: this product works with my other Qi products,” says Menno Treffers, a senior director of standardization at Philips who works with the consortium. “That promise holds if the logo is used on properly tested products. No Qi logo on products that don’t work! To protect Qi’s promise, the logo is trademarked and you need a license to use the logo. That license makes the use of the logo dependent on certification by an independent test lab.”

The WPC will begin certification testing of products this August, so products sporting the Qi logo could start appearing this fall.

Via ars technica

About the Author
Darren Quick Darren's love of technology started in primary school with a Nintendo Game & Watch Donkey Kong (still functioning) and a Commodore VIC 20 computer (not still functioning). In high school he upgraded to a 286 PC, and he's been following Moore's law ever since. This love of technology continued through a number of university courses and crappy jobs until 2008, when his interests found a home at Gizmag. All articles by Darren Quick

So basically this thing would need to be powered up at all times and drawing more electricity than your average wall wart, unless there\'s some method of sensing if there are any devices on it. Plus the losses inherent in induction charging. Just what we need, more waste of electricity.


While I like it, and it was pretty much inevitable for this to happen.

The fact is, the whole \"multiplying electronic\" thing is not true anymore, that trend is reversing. Now your cell phone, is also your mp3 player, and your camera. I just got the droid Incredible, and have over 30 gigs of space & an 8MP camera...


I think wireless electricity is going to be a major new trend. I am sure you must have heard how a few years ago, scientists at MIT had managed to successfully transmit power through air. Check out this link about wireless power. Has some really neat information :

Vivek Ranjan

Awesome idea. Now if only there was a consortium that made a standard connection/protocol for MP3 players, phones ect. that was an IPOD dock alternative.


someone calculate the field intensity this thing gives off

tell me it isn;t 10000 times more than power lines that people are afraid to live under

or ''having a tv in the bedroom, even turned off''


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