Talk:Qi (standard)

Why this discussion has been opened
The wireless power consortium have one standard so it asks the question if the organisation and the standard have a one to one relationship should they have their own articles?

--Back ache

Yes, I agree. I've merged the Wireless Power Consortium article into this one.

InternetMeme (talk) 08:57, 21 October 2012 (UTC)

Pronunciation of article subject?
First line - "pronounced chee" - chee like "cheese" with a [tʃ] or like "khee" with a [x] c'mon guys, seriously? I came here to find out what this thing is (followed a link from wireless charging) and all you fat cat corporate editors can't even get someone to tell you the IPA symbols for your product? 5telios (talk) 18:07, 17 February 2013 (UTC)

Proposed edits
--Menno WPC (talk) 16:13, 13 December 2011 (UTC) I am the chairman of the Wireless Power Consortium. I suggest making the following update to the page:

Established in 2008, the WPC is an open-membership cooperation of Asian, European, and American companies in diverse industries, including electronics manufacturers and original equipment manufacturers (OEMs). WPC is working toward the global standardization of wireless charging technology.

The WPC’s standard for wireless power, called “Qi” (pronounced “chee”) creates interoperability between the device providing power (power transmitter, charging station) and the device receiving power (power receiver, portable device). Using the Qi standard, a range of mobile electronics will be able to use magnetic induction to recharge simply by being near a single power transmitter.

Since no objections have been raised I am going to make this update to the article. --Menno WPC (talk) 15:07, 21 December 2011 (UTC)

Logitech currently (10/2/2009) is not shown on wireless power consortium's official website.

who can confirm it? --Menno WPC (talk) 16:13, 13 December 2011 (UTC)Logitech is indeed not a member of the Wireless Power Consortium.

I propose to make additional changes to this page as follows. --Menno WPC (talk) 15:47, 5 January 2012 (UTC)

History
Established December 17, 2008, the WPC is in the process of creating a universal wireless power charging standard that allows electronic products and charging stations to be compatible with one another. Founding member companies include: ConvenientPower Limited, Fulton Innovation LLC, Logitech SA, National Semiconductor Corporation, Royal Philips Electronics N.V., Sanyo Electric Co. Ltd., Shenzhen Sang Fei Consumer Communications Co. Ltd. and Texas Instruments Incorporated.

In 2009, Nokia joined the WPC. Huawei and Visteon became members of the WPC in 2011.

The WPC published the Qi low power specification in August 2009.

In 2011, the Wireless Power Consortium began to extend the Qi specification to medium power.

The low-power specification delivers up to 5 watts; the medium-power specification will deliver up to 120 watts.

Members
WPC member companies represent several industries, including wireless power (e.g., Fulton Innovation, ConvenientPower, Sanyo, Powerkiss, Powermat), semiconductors (e.g., Texas Instruments, Freescale, ST Ericsson, MediaTek), infrastructure (e.g., Leggett & Platt, Continental Automotive, PLDS, Johnson Controls, Visteon), operators (e.g., Verizon Wireless, Orange, Softbank), testing and certification companies (e.g., TUV Rheinland, UL, NTS), electronic manufacturing services and original equipment manufacturers (e.g., Compal, Promax, Sang Fei) and consumer brands (e.g., Samsung, Huawei, HTC, Philips, Energizer).

There are more than 100 member companies in the WPC.
 * Alps Electric Co., Ltd.
 * AudioDev
 * AVID Technology
 * Belkin International, Inc
 * Bothhand Enterprise Inc.
 * Callpod
 * Cetecom GmbH
 * Chicony Power Technology Co., Ltd.
 * Compal
 * Continental Automotive
 * ConvenientPower
 * D.L.S. Electronic Systems, Inc.
 * Delta Energy Systems (Arizona) Inc.
 * Denso Corporation
 * E & E Magnetic Products
 * Energizer
 * Ever Win
 * Fairchild Semiconductor
 * Faraday Technology Corporation
 * France Telecom SA
 * Freescale Semiconductor
 * Fulton Innovation
 * Funkwerk Dabendorf
 * Haier
 * Hanrim Postech Co., Ltd.
 * Hosiden Corporation
 * HTC Corporation
 * Huawei Technologies Co., Ltd.
 * Hubei Pine Tum Electronics Technology Co. Ltd.
 * IB-Lenhardt AG — Preceding unsigned comment added by 78.109.62.242 (talk) 09:50, 22 April 2022 (UTC)
 * IMST GmbH
 * Integrated Device Technology
 * Intersil Corporation
 * Jeckson Electric Co. Ltd.
 * Johnson Controls
 * KEMA Quality
 * Leggett & Platt
 * LG Electronics
 * Logah Technology Corp.
 * LS Cable
 * MapTech Co. Ltd
 * Maxim Integrated Products
 * MCM
 * MediaTek
 * Mizco International
 * Modelabs
 * Monolithic Power Systems
 * mophie LLC
 * Motorola Mobility Inc.
 * Ndigo Business B.V.
 * NEC Corporation
 * Nokia
 * NTS
 * Onkyo Corporation
 * OPENTECH INC.
 * Panasonic
 * Pantech Co., Ltd.
 * paragon AG
 * Philips
 * Powerkiss
 * Powermat Ltd.
 * Primax Electronics Ltd.
 * radius co., ltd.
 * Rasta Banana Co., Ltd.
 * Rohm Co., Ltd.
 * RRC power solutions GmbH
 * Salcomp Plc
 * Samsung
 * Samsung Electro-Mechanics Co. Ltd.
 * Sang Fei
 * Scosche Industries
 * SCUD (Fujian) Electronics Co., Ltd.
 * Softbank BB Corp.
 * Sony-Ericsson
 * Spectrum Brands Inc.
 * ST-Ericsson
 * Stanley Black & Decker
 * Technocel
 * Telecommunication Metrology Center of MIIT
 * TennRich International Corp.
 * Testronic Laboratories
 * Texas Instruments
 * Tokai Rika Co., Ltd.
 * Toko, Inc.
 * Topseed Technology Corp.
 * Triune Systems
 * TÜV Product Service
 * TUV Rheinland
 * U-Way Corporation
 * UL
 * Verizon Wireless
 * Visteon
 * Winchance Solar (Fujian) Technology Co., Ltd.
 * Wisepower
 * Xentris Wireless

I propose to add the following sections to this page as follows: --Menno WPC (talk) 16:16, 24 January 2012 (UTC)

Mission
The WPC’s mission is to create and promote wide market adoption of Qi the international wireless power standard for interoperability across rechargeable electronic devices.

Leadership and Governance
The Wireless Power Consortium is a cooperation of independent companies. The cooperation is governed by a Consortium Charter that defines rules for confidentiality, intellectual property and decision making. Five work groups oversee different functions of the WPC.

The Steering Group, comprised of representatives from regular member companies, manages the WPC. Menno Treffers serves as both the chairman of the WPC and of the Steering Group.

The Low Power Work Group maintains the technical specification of the Qi low power wireless power standard.

The Medium Power Work Group creates the technical specification of the Qi medium power wireless power standard, up to 120 Watts.

The Promotion Work Group is responsible for the external communication of the consortium.

The Associate Communication Team is responsible for the communication with WPC Associate Members.

Qi Technology
The name "Qi" comes from the "qi" concept of energy flow from Chinese medicine, and is pronounced "chee." Qi works by generating an electromagnetic field between a charger and a device through magnetic induction. Qi chargers have a built-in transmitting coil that communicates with Qi devices using a specific electromagnetic frequency, so any Qi device will work with any Qi charger.

Under the Qi specification, "low power" for wireless transfer means a draw of 0 to 5 W. Systems that fall within the scope of this standard are those that use inductive coupling between two planar coils to transfer power from the power transmitter to the power receiver. The distance between the two coils is typically 5 mm. Regulation of the output voltage is provided by a digital control loop where the power receiver communicates with the power transmitter and requests more or less power. Communication is unidirectional from the power receiver to the power transmitter via backscatter modulation. In backscatter modulation, the power-receiver coil is loaded, changing the current draw at the power transmitter. These current changes are monitored and demodulated into the information required for the two devices to work together.

Magnetic vs Electromagnetic - confusion
The article currently states: "Qi works by generating an electromagnetic field between a charger and a device through magnetic induction. Qi chargers have a built-in transmitting coil that communicates with Qi devices using a specific electromagnetic frequency"

If Qi uses magnetic induction, then the field would be magnetic, note electromagnetic. A frequency is a frequency and not a "electromagnetic frequency"

A clear technology explanation would be useful here: is the field magnetic or electromagnetic, what frequency, what field strength, ... and keep the pseudo technical marketing blah blah away please. — Preceding unsigned comment added by 194.213.3.4 (talk) 10:03, 6 September 2012 (UTC)
 * Same difference. A changing magnetic field will generate electricity in a conductor.--195.137.93.171 (talk) 04:48, 25 October 2013 (UTC)


 * It's more fundamental than that. If you have a changing magnetic field, then it is accompanied by a changing electric field (and vice versa). Only when each field is in a steady state can you have one without the other. 86.146.209.211 (talk) 18:42, 7 February 2019 (UTC)

Efficiency
This article says nothing about efficiency. Presumably it is much less efficient than microUSB since inductive energy would easily be lost to the surroundings. Some efficiency figures should be included in the article. — James Haigh (talk) 2013-06-01 T 16:28:42Z


 * http://www.wirelesspowerconsortium.com/technology/total-energy-consumption.html 2018 Archive
 * A link I found on their website. I will continue to look for a more scientific research or something. May be useful to email a tech website and see if they know of anything. Buffalodan (talk) 14:56, 4 June 2013 (UTC)


 * http://www.wirelesspowerconsortium.com/technology/comparison-of-power-savings.html 2017 Archive
 * And another. I am not a fan of their math however. I don't leave a wired charger plugged in all the time. Buffalodan (talk) 14:58, 4 June 2013 (UTC)


 * I'm not a fan of self-verification. Some of those figures look to be manipulated in their favour. Any independent sources? — James Haigh (talk) 2013-06-27 T 17:08:15Z


 * Added some web archive links Xp fun (talk)

Disadvantages/Problems
Are there any disadvantages or problems? For example, is there any potential for the energy transmission to affect the battery or electronics of the device? Does the Qi system contribute to EMF pollution or have the potential to affect tissue like police radar or excessive cell phone use? What is the efficiency of energy transfer of the Qi system (specifically Qi, and not other generic or experimental systems). I was hoping to get a more complete picture here in this article. Since these devices are being proliferated all over the world, I would have hoped these questions would be easily answered. N0w8st8s (talk) 11:13, 21 December 2013 (UTC)n0w8st8s

Yes, there are some advantages of course. But I will answer the Questions before talking about the Disadvantages. If the receiver part is well designed, then it will not affect the battery or electronic very much; And EMF problem is not a big deal in Qi system; Qi now has the highest Eff = 80% at 5V 1A; Now I will tell you what are the real disadvantages: 1st is high temperature rise when charging, and the 2nd is too big and thick, and the 3rd is not waterproof. Once you have try the traditional Qi charger, you will admit what I said and find you make a wrong dealing. Once there are Questions, and there will be answers too. There will be a new type of Qi charger Call "Mil" show out in Sep 2014, which give user ultra cool charging experience, and Ultra Thin with waterproof. — Preceding unsigned comment added by Nxyt (talk • contribs) 12:17, 25 June 2014 (UTC)

Patent coverage? License fees?
One of the most important aspect of a "standard" is the limitations and costs of using it in products (e.g. see https://en.wikipedia.org/wiki/MP3#Licensing,_ownership_and_legislation . Just because something is published doesn't mean that it is freely usable by all comers (e.g. see https://opensource.com/law/11/1/open-standards-and-royalty-problem ).

Unfortunately, there is no mention of patent coverage or license fees in this article, and the only reference to "license" calls it an "open standard", which article states "There is no single definition and interpretations vary with usage". The closest thing I could find is the statement that "the Qi specification can be downloaded freely after registration", which is interesting, but beside the point (all it says is that the technology isn't a secret).

So, questions that should be addressed:

- Is this technology covered by any patents? (I'd have to assume "yes"...) - Are there fees or other costs involved in using it in products? - Who governs the process for labeling your product as "Qi-compatible"?

-- Dan Griscom (talk) 12:15, 17 August 2018 (UTC)


 * «Is this technology covered by any patents?»
 * MPEG-LA says so https://www.mpegla.com/programs/qi-wireless-power/
 * Even with royalties.
 * Doesn't that void the "open standard" thing? Or maybe the patent claims are an attempt to troll like with DisplayPort and AV1?
 * Which means status remains unclear until court case happens right?
 * https://en.wikipedia.org/wiki/DisplayPort#Cost
 * https://en.wikipedia.org/wiki/AV1#Patent_claims
 * --Tuxayo (talk) 16:02, 1 April 2020 (UTC)