IEC 63563-3:2025

Qi Specification version 2.0 - Part 3: Mechanical, Thermal, and User Interface

IEC 63563-3:2025 identifies basic physical design requirements and guidelines for Power Transmitter and Power Receiver Products, including product and system dimensions, alignment of the products, surface temperature rise, and indications to the user.

Spécification Qi version 2.0 - Partie 3 : Mécanique, thermique et interface usager

IEC 63563-3:2025 identifie les exigences et lignes directrices de base en matière de conception physique pour les produits émetteurs et récepteurs de puissance, y compris les dimensions du produit et du système, l'alignement des produits, l'élévation de la température de surface et les indications destinées à l'usager.

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: PPUB - Publication issued
• Start Date: 10-Feb-2025
• Completion Date: 07-Mar-2025

Overview

IEC 63563-3:2025 - Qi Specification version 2.0, Part 3: Mechanical, Thermal, and User Interface defines the basic physical, thermal and user-interface requirements and guidance for wireless power products. Published by IEC and based on the Wireless Power Consortium (WPC) Qi v2.0 documentation, the standard covers product and system dimensions, alignment aids, interface surface temperature behaviour, and user indications for Power Transmitter and Power Receiver products.

Key topics and requirements

• Scope and compliance
  • Establishes mandatory design provisions (unless called out as informative or recommended) and follows ISO/IEC directives for normative language.
• Mechanical design
  • Recommended Interface Surface sizes for good user experience:
    • Baseline Power Profile (BPP): at least 107 × 177 mm.
    • Extended Power Profile (EPP): recommended 439 × 329 mm.
  • Guidance to mark or otherwise indicate Active Area(s) on the transmitter (visual markings, lighting, logos).
  • Power Receiver form-factor guidance (X,Y dimensions) aligned to the same profile limits.
• Alignment and coil placement
  • Power Receiver designs must include a Secondary Coil and Interface Surface. The distance from the Secondary Coil to the Interface Surface shall not exceed 2.5 mm across the bottom face of the coil.
  • Alignment aids for both transmitter and receiver are described to improve user experience and charging efficiency.
• Thermal (interface surface temperature rise)
  • The document specifies requirements and test guidance related to the interface surface temperature rise during wireless power transfer and how to indicate thermal states to users (section on surface temperature rise is normative).
• User interface requirements
  • Defines required user interactions and indications for both transmitter and receiver products (status, alignment, thermal warnings, etc.) to ensure predictable behavior and safety.
• Power Profiles
  • Clarifies BPP and EPP capabilities and related mechanical expectations (compatibility between transmitter and receiver).

Applications and who uses this standard

• Product designers and mechanical engineers building wireless chargers, mobile devices, wearables, accessories, automotive or furniture-integrated charging surfaces.
• Thermal engineers responsible for interface surface temperature compliance and testing.
• UX/UI designers implementing alignment cues and user indications (LEDs, haptics, displays).
• Compliance and certification labs, manufacturers, and system integrators ensuring interoperability with Qi ecosystems and IEC conformity.

Related standards

• Other parts of the Qi Specification series: Power Delivery, Communications Physical Layer, Communications Protocol, Foreign Object Detection, NFC Tag Protection, Authentication Protocol (see the Qi Specification structure in IEC 63563 series).
• ISO/IEC Directives referenced for editorial and compliance conventions.

Keywords: IEC 63563-3:2025, Qi Specification version 2.0, wireless power, power transmitter, power receiver, mechanical design, thermal, user interface, alignment, interface surface temperature.

Standards Content (Sample)

IEC 63563-3 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
Qi Specification version 2.0 –
Part 3: Mechanical, Thermal, and User Interface

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IEC 63563-3 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
Qi Specification version 2.0 –

Part 3: Mechanical, Thermal, and User Interface

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.99; 35.240.99 ISBN 978-2-8327-0186-7

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
QI SPECIFICATION VERSION 2.0 –
Part 3: Mechanical, Thermal, and User Interface
FOREWORD
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IEC 635-3 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, Mechanical, Thermal, and User Interface 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
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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.
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specific document. At this date, the document will be
x reconfirmed,
x withdrawn, or
x revised.
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WIRELESS POWER
CONSORTIUM
Qi Specification
Mechanical, Thermal, and User
Interface
Version 2.0
April 2023
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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.

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Table of Contents
1  General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Structure of the Qi Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 Power Profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2  Power Receiver design requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3  Mechanical design guidelines (Informative). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Power Transmitter Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Power Receiver Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Power Transmitter Product Alignment Aid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Power Receiver Product Alignment Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4  Interface Surface temperature rise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5  User Interface requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 User interaction with a Power Transmitter Product. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 User interaction with a Power Receiver Product. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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1 General
The Wireless Power Consortium (WPC) is a worldwide organization that aims to develop and
promote global standards for wireless power transfer in various appl
...