IEC 63563-1:2025

Qi Specification version 2.0 - Part 1: Introduction

IEC 63563-1:2025 introduces the Qi Specification, which applies to flat surface devices such as mobile phones and tablets that use up to 15 W of power

General Information

• Status: Published
• Publication Date: 09-Feb-2025
• ICS: 29.240.99 - Other equipment related to power transmission and distribution networks
• ICS: 35.240.99 - IT applications in other fields
• Technical Committee: TA 15 - Wireless Power Transfer
• Drafting Committee: WG 1 - TC 100/TA 15/WG 1
• Current Stage: PRVD - Preparation of RVD
• Start Date: 17-Jan-2025
• Due Date: 17-Jan-2025
• Completion Date: 17-Jan-2025

Standards Content (Sample)

IEC 63563-1 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
Qi Specification version 2.0 –
Part 1: Introduction
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.

IEC Just Published - webstore.iec.ch/justpublished
Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.

Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need

further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 63563-1 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
Qi Specification version 2.0 –

Part 1: Introduction
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.99; 35.240.99 ISBN 978-2-8327-0182-9

 ,(&‹,(&
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
QI SPECIFICATION VERSION 2.0 –
Part 1: Introduction
FOREWORD
 The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprisingall
national electrotechnical committees (IEC National Committees). The object of IEC is to promote internationalco-
operation on all questions concerning standardization in the electrical and electronic fields. To this end andin addition
to other activities, IEC publishes International Standards, Technical Specifications, TechnicalReports, Publicly
Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Theirpreparation is entrusted to
technical committees; any IEC National Committee interested in the subject dealt withmay participate in this
preparatory work. International, governmental and non-governmental organizationsliaising with the IEC also
participate in this preparation. IEC collaborates closely with the InternationalOrganization for Standardization
(ISO) in accordance with conditions determined by agreement between the twoorganizations.
 The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
 IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
 In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence betweenany IEC
Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
 IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
 All users should ensure that they have the latest edition of this publication.
 No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage orother
damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) andexpenses
arising out of the publication, use of, or reliance upon, this IEC Publication or any other IECPublications.
 Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
 IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights inrespect
thereof. As of the date of publication of this document, IEC had notreceived notice of (a) patent(s),which may be
required to implement this document. However, implementers are cautioned that this may notrepresent the latest
information, which may be obtained from the patent database available athttps://patents.iec.ch. IEC shall
not be held responsible for identifying any or all such patent rights.
IEC 635-1 has been prepared by technical area 15: Wireless Power Transfer, of IEC
technical committee 100: Audio, video and multimedia systems and equipment. It is an
International Standard.
It is based on Qi Specification version 2.0, Introduction and was submitted as a Fast-Track
document.
The text of this International Standard is based on the following documents:
Draft Report on voting
//FDIS /RVD
,(&‹,(& 
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
The structure and editorial rules used in this publication reflect the practice of the organization
which submitted it.
This document was developed in accordance with ISO/IEC Directives, Part 1 and ISO/IEC
Directives, IEC Supplement available at www.iec.ch/members_experts/refdocs. The main
document types developed by IEC are described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
x reconfirmed,
x withdrawn, or
x revised.
 ,(&‹,(&
WIRELESS POWER
CONSORTIUM
Qi Specification
Introduction
Version 2.0
April 2023
,(&‹,(& 
DISCLAIMER
Theinformationcontainedhereinisbelievedtobeaccurateasofthedateofpublication,
butisprovided“asis”andmaycontainerrors.TheWirelessPowerConsortiummakesno
warranty,expressorimplied,withrespecttothisdocumentanditscontents,includingany
warrantyoftitle,ownership,merchantability,orfitnessforaparticularuseorpurpose.
NeithertheWirelessPowerConsortium,noranymemberoftheWirelessPower
Consortiumwillbeliableforerrorsinthisdocumentorforanydamages,includingindirect
orconsequential,fromuseoforrelianceontheaccuracyofthisdocument.For any further
explanation of the contents of this document, or in case of any perceived inconsistency or ambiguity
of interpretation, contact: [e-mail].
RELEASE HISTORY
Specification Version Release Date Description
2.0 April 2023 Initial release of the v2.0 Qi Specification.

 ,(&‹,(&
Table of Contents
1  About the Wireless Power Consortium. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2  What is the Qi wireless power transfer system? . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3  How Qi wireless power transfer works. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Basic concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Examples of Qi wireless products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4  Qi wireless power transfer features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Power levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Operating frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Charging area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.4 Coupling requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5 Communication protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.6 Foreign object handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5  Structure of the Qi Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

,(&‹,(& 
1 About the Wireless Power Consortium
The Wireless Power Consortium (WPC) is a worldwide organization that develops and promotes
the global interface standard for wireless power transfer called Qi . Interface standards ensure the
interoperability of devices that conform to that standard. Supported by more than 600 companies
and with thousands of certified products, Qi has become the international wireless-charging
standard for hand-held consumer electronics.
This document introduces the QiSpecification, which applies to flat surface devices such as mobile
phones and tablets that use up to 15 W of power.
The WPC actively investigates new applications for wireless power transfer, such as a cordless
kitchen solution that uses Power Transmitters installed underneath countertops and tables that
enable a variety of kitchen appliances and smart cookware to operate without power cords.
Qi (Ề ; qì) is pronounced “chee,” and is the Chinese word for energy flow or life force.
Version 1.2 of the QiSpecification introduced fast charging, which covers transmitter and
receiver products that use up to 15 W of power. However, the architectural limit of the extended
power profile is about 30 W, which will accommodate a growing family of Qi product designs.

 ,(&‹,(&
2 What is the Qi wireless power transfer system?
The powering of hand-held devices is continuing to evolve. Originally, electrical devices had to be
plugged directly into outlets, and the range of operation was limited by the length of the power
cord. Next came disposable batteries that severed the power cord’s range restriction.
Figure 1. Corded appliance (c. 1950) to battery-powered consumer electronics (c. 1955)
In recent years, rechargeable batteries have all but replaced disposable batteries, eliminating the
need to purchase, store, and throw large quantities of these batteries into landfills. But for
frequently-used devices—smartphones in particular—recharging became a daily ritual of plugging
and unplugging charging cables.
A new era of convenience emerged in 2011 when the first Qi wireless smartphone case was
introduced, followed shortly thereafter by smartphones with built-in Qi wireless support. Qi
wireless devices need only to be set down on a Qi wireless charger for recharging to occur. The
device remains unplugged and ready to be picked up and used at any moment. With the
deployment of Qi chargers in cars, enterprises, and public locations, it becomes possible to no
longer worry about running out of charge or carrying charger cables.
Figure 1 and Figure 2 show the evolution of corded power to wirelessly-charged portable devices.

,(&‹,(& 
Figure 2. Plug-in rechargeable mobile phones (c. 1999) to wirelessly-charged smartphones (since
2012)
The adoption of the Qi standard has grown significantly since the first products were introduced. In
a 2014 consumer survey conducted by IHS Inc., 36% of consumers in China, the UK, and the U.S.
said they had heard of wireless charging. One year later that number doubled, reaching 76%
consumer awareness. In 2015 more than 150 million Qi systems have been ship
...