prEN IEC 63758-1-2:2026

• Status: Not Published
• Publication Date: 23-Feb-2028
• Technical Committee: CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
• Current Stage: 4020 - Enquiry circulated - Enquiry
• Start Date: 18-Sep-2026
• Completion Date: 18-Sep-2026
• Directive: 2014/53/EU - Directive 2014/53/EU of The European Parliament and of the Council of 16 April 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC
• Mandate: M/607 - COMMISSION IMPLEMENTING DECISION of C(2025)1207 on a Standardisation Request M/607 as regards charging interface and charging communication protocol for radio equipment capable of being recharged by means of wireless charging in relation with Article 3(4), sixth subparagraph, of Directive 2014/53/EU of the European Parliament and of the Council.
• Ref Project: oSIST prEN IEC 63758-1-2:2026 - Qi specification - Version 2.3 - Part 1-2: General - Glossary (Fast Track)

prEN IEC 63758-1-2:2026 is the CLC fast-track draft glossary for the Qi specification, Version 2.3, Part 1-2. It defines the terms, acronyms and symbols used across Qi wireless power documents, including Power Transmitter (PTx), Power Receiver (PRx), authentication, foreign object detection and the notation used for electrical quantities. Engineers, test labs, quality teams and buyers can use it as the shared vocabulary for Qi-compatible wireless power products and related documentation.

What does prEN IEC 63758-1-2:2026 specify?

prEN IEC 63758-1-2:2026 specifies the official Qi vocabulary and symbol conventions for Version 2.3. The document is organized into three clauses: Clause 1 Definitions, Clause 2 Acronyms and Clause 3 Symbols.

Clause 1 gathers the main technical terms used in Qi wireless power transfer, from physical parts such as coils and shielding to security, power negotiation and foreign object detection. Clause 2 lists the abbreviations used throughout Qi documents. Clause 3 sets out the notation rules and the named symbols used for quantities such as power, current, voltage, inductance, quality factor, timing windows and frequency.

What are the key requirements of prEN IEC 63758-1-2:2026?

The key content of prEN IEC 63758-1-2:2026 is the terminology and notation that other Qi parts rely on. In practice, it helps designers, test engineers and certification teams use the same words and symbols when describing a product, a test result or a negotiated power transfer.

Clause 1: the core Qi terms

Clause 1 defines the main building blocks of a Qi system, including Power Transmitter, Power Receiver, PowerSignal, InterfaceSurface, AirGap, OperatingVolume and PowerTransferContract. These terms matter because they describe where power transfer happens, how far the products are apart and what settings govern the transfer.

Clause 1 also defines product and circuit terms such as PrimaryCell, PrimaryCoil, SecondaryCoil, ControlPoint, LoadPower and ReceivedPower. This gives implementers a common way to describe how electrical energy moves from the transmitter to the receiver and then into the load.

Clause 1: security, identity and certificates

Clause 1 defines Authentication, Certificate, CertificateChain, CertificateAuthority, LeafCertificate, RootCertificate, ProductUnitCertificate, ManufacturerCACertificate, Revocation and RevocationList. These terms are used when a Qi device proves identity or when a certificate is withdrawn.

In practice, these definitions support interoperability and traceability. They tell a manufacturer or integrator how to speak about device identity, signed certificates and trust relationships without ambiguity.

Clause 1: foreign object detection and ping terms

Clause 1 defines ForeignObject, ForeignObjectDetection (FOD), FriendlyMetal, CriticalRadius, AnaloguePing, DigitalPing and Open-airPing. These terms describe the Qi methods used to detect objects that may heat up during power transfer and to check for a receiver before transfer starts.

This matters for safety work and validation. Teams use these definitions when they design detection behavior, interpret test results and explain what happens before a receiver is allowed to draw power.

Clause 1: power profiles and protocol terms

Clause 1 defines PowerProfile, BaselinePowerProfile, ExtendedPowerProfile, BaselineProtocol and ExtendedProtocol. It also defines BaselinePowerProfile and ExtendedPowerProfile as supported PowerProfile entries.

These terms help teams identify the compliance level or protocol family a device supports. They are the labels used in product descriptions, interoperability planning and implementation choices.

Clause 3: symbol and notation rules

Clause 3 says that uppercase symbols represent average or root-mean-square quantities, while lowercase symbols represent peak quantities. It also states that a primed symbol indicates a quantity that changes with the relative positions of a Power Transmitter, Power Receiver or ForeignObject(s).

This is important when reading equations, tables and test data. The clause also assigns units to many named quantities, including power, current, voltage, frequency, inductance, resistance, quality factor and timing windows, so readers can compare values consistently.

What terms does prEN IEC 63758-1-2:2026 define?

• ActiveArea - the part of the InterfaceSurface through which enough magnetic flux passes during power transfer.
• AirGap - the distance between the transmitter top surface and the receiver bottom surface, including any extra spacing from user-added accessories.
• OperatingVolume - the set of receiver positions where the transmitter can sustain power transfer.
• PowerTransferContract - the collection of settings and limits that governs a power transfer.
• ForeignObjectDetection (FOD) - the process used to determine whether a ForeignObject is present in the OperatingVolume and could heat beyond safe limits.
• WPID - a 48-bit number that uniquely identifies a Qi-compliant device.

Who uses prEN IEC 63758-1-2:2026?

Qi product designers use prEN IEC 63758-1-2:2026 when they need to describe transmitter and receiver behavior consistently. Test laboratories use it when they write test reports or interpret terms such as FOD, OperatingVolume, Q-test and Authentication.

Manufacturers of Power Transmitter and Power Receiver products use it for specifications, user documentation and certification files. Quality managers and buyers use it to check that product claims, technical documents and compliance statements use the same Qi terms.

Which standards are used with prEN IEC 63758-1-2:2026?

The glossary points readers to Qi Specification, Communications Protocol for data packet mnemonics. That companion part is the place to look when a Qi document uses packet-level shorthand that is not expanded in the glossary.

What does the prEN IEC 63758-1-2:2026 document contain?

prEN IEC 63758-1-2:2026 contains a long list of defined Qi terms, acronyms and symbols rather than test procedures or worked examples. Clause 1 covers device parts, operating geometry, power quantities, security objects, detection terms, profiles and protocol names.

Clause 2 lists acronyms such as PTx, PRx, FOD, BPP, EPP, ASK, FSK, NFC and WPC. Clause 3 gives the symbol conventions and the named quantities with their units, covering electrical, timing and geometric values used across Qi implementation and testing.

SLOVENSKI STANDARD
01-november-2026
Specifikacija Qi - Različica 2.3 - 1-2. del: Splošno - Slovar (hitri postopek)
Qi specification - Version 2.3 - Part 1-2: General - Glossary (Fast Track)
Ta slovenski standard je istoveten z: prEN IEC 63758-1-2:2026
ICS:
01.040.29 Elektrotehnika (Slovarji) Electrical engineering
(Vocabularies)
29.240.99 Druga oprema v zvezi z Other equipment related to
omrežji za prenos in power transmission and
distribucijo električne energije distribution networks
33.160.99 Druga avdio, video in Other audio, video and
avdiovizuelna oprema audiovisual equipment
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

100/4537/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63758-1-2 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-09-18 2026-12-11
SUPERSEDES DOCUMENTS:
IEC TC 100 : AUDIO, VIDEO AND MULTIMEDIA SYSTEMS AND EQUIPMENT
SECRETARIAT: SECRETARY:
Japan Ms Mahiru Uehara
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 106,TC 108
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Qi Specification - Version 2.3 - Part 1-2: General - Glossary (Fast Track)

PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
As this is a fast-track process offered by WPC, the Word file is not provided.
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electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

QiSpecification
Glossary
Version2.3
PublishDate:08December2025
DISCLAIMER
Theinformationcontainedhereinisbelievedtobeaccurateasofthedateofpublication,butisprovided“asis”andmay
containerrors.TheWirelessPowerConsortiummakesnowarranty,expressorimplied,withrespecttothisdocument
anditscontents,includinganywarrantyoftitle,ownership,merchantability,orfitnessforaparticularuseorpurpose.
NeithertheWirelessPowerConsortium,noranymemberoftheWirelessPowerConsortiumwillbeliableforerrorsin
thisdocumentorforanydamages,includingindirectorconsequential,fromuseoforrelianceontheaccuracyofthis
document.Foranyfurtherexplanationofthecontentsofthisdocument,orincaseofanyperceivedinconsistencyor
ambiguityofinterpretation,contact:[e-mail].

Contents
1. Definitions 4
2. Acronyms 8
3. Symbols 10
1. Definitions
ActiveArea ThepartoftheInterfaceSurfaceofaPowerTransmitterProductorPower
ReceiverProductthroughwhichasufficientlyhighmagneticflux
penetrateswhenthePowerTransmitterProductisprovidingpowertothe
PowerReceiverProduct.
AirGap ThedistancebetweenthetopsurfaceofaPowerTransmitterProductand
thebottomsurfaceofaPowerReceiverProduct.
NOTE:TheAirGapalsocomprisesanyadditionalspacingbetweenaPower
TransmitterProductandaPowerReceiverProductintroducedby
accessoriesaddedbyausertoeitherproduct.
AnaloguePing Ashort-durationPowerSignalappliedbyaPowerTransmitterwiththe
purposeofdetectingthepresenceofanobject,withoutwakingupaPower
Receiver.
Authentication Atamper-resistantprocessofaPowerReceiververifyingtheidentityofa
PowerTransmitter.
BaselinePowerProfile AsupportedPowerProfile.
BaselineProtocol Thecommunicationsprotocolintroducedinversion1.0oftheQi
Specification.
Certificate AdigitalformofidentificationthatprovidesinformationaboutaCertificate
Authority,amanufacturer,oraPowerTransmitterProductUnit,and
certifiesownershipofapublickey.
CertificateAuthority AnorganizationthatissuesCertificates.
CertificateChain AseriesoftwoormoreCertificateswhereeachCertificateissignedbythe
owneroftheprecedingCertificateinthechain.
CommunicationsandControl ThefunctionalpartofaPowerTransmitterorPowerReceiverthatcontrols
Unit thepowertransfer.
ControlPoint Thecombinationofvoltageandcurrentprovidedattheoutputofthe
PowerReceiver,andotherparametersthatarespecifictoaparticular
PowerReceiverimplementation.
CriticalRadius Distancefromthecentreofthecoilthatdefinestheareawithinwhichan
FOwillheatupbeyonditstemperaturelimitswhenthePTxtransfersthe
maximumratedpowertoaPRxatanypositionwithintheactivevolumeat
thatpower.
TheCriticalradiusdependsonthetypeofForeignObject.
DataStreamInitiator APowerTransmitterorPowerReceiverthatcanopenadatatransport
stream.
DataStreamResponder APowerTransmitterorPowerReceiverthatcanacceptadatatransport
stream.
DetectionUnit ThefunctionalpartofaPowerTransmitterthatdetectsthepresenceofa
PowerReceiverontheInterfaceSurface.
DigitalPing APowerSignalappliedbyaPowerTransmitterwiththepurposetowake
upaPowerReceiver.
EvaluationAssuranceLevel Anumericalratingdescribingthedepthandrigourofasecurityevaluation.
ExtendedProtocol Thecommunicationsprotocolintroducedinversion1.2andenhancedin
laterversionsoftheQiSpecification.
ExtendedPowerProfile: AsupportedPowerProfile.
ForeignObject AnobjectthatisneitherpartofaPowerTransmitterProductnorofa
PowerReceiverProductandthatcangenerateheatwhenexposedtoa
PowerSignal.
ForeignObjectDetection AprocessusedbyaPowerTransmitterandPowerReceivertodetermine
whetheraForeignObjectispresentintheOperatingVolumeandcan
generateheatbeyondsafelimits.
FriendlyMetal AnintegralpartofaPowerReceiverProductoraPowerTransmitter
ProductthatcanunintentionallygenerateheatwhenexposedtoaPower
Signal.
GuaranteedLoadPower ALoadPowerlevelagreedbetweenthePowerReceiverandthePower
Transmitter.
InterfaceSurface TheflatpartofthesurfaceofaPowerTransmitterProductthatisclosest
tothePrimaryCoil(s).
IntermediateCertificate ACertificatethatispositionedinaCertificateChainbetweentheRoot
CertificateandtheLeafCertificate.
Issuer ACertificate-providingentitysuchastheWPCCAoraManufacturerCA.
LeafCertificate ThelastCertificateinaCertificateChain.
Load AsubsystemthatcandrawpowerfromaPowerReceiver.
LoadPower ThepowerdissipatedintheLoad.
ManufacturerCACertificate ACertificatethatdescribesamanufacturer.ItissignedbytheCertificate
AuthorityandisusedasanIntermediateCertificate.
ManufacturerCode A16-bitnumberthatidentifiesthemanufacturerofthePowerTransmitter
orPowerReceiver.ThisnumberisalsoreferredtoasthePower
TransmitterManufacturerCode(PTMC)orthePowerReceiver
ManufacturerCode(PRMC).
ModelPowerReceiver AnidealisedPRxproductfromwhichthesystemrequirementsarederived.
ModelPowerTransmitter AnidealisedPTxproductfromwhichthesystemrequirementsarederived.
MPPPowerLossAccounting Anextensiontopowerlossaccounting (usedinBPP),thatusesamodelof
(MPLA) thephysicsofthewirelesspowersystemtoimproveaccuracy.Itenables
thePTxandPRxtotaketemperatureandtheimpactoffriendlymetalinto
account(i.e.,compensateforthese),withalargeecosysteminmind.
Nonce AnumberusedonlyonceinanygivencontextoftheAuthentication
protocol.
Open-airPing Theopen-airQtestprovidesamethodfordetectingForeignObjectsplaced
ontopofaPowerTransmitterProductbeforeaPowerReceiverProductis
broughtintotheOperatingVolume.
OperatingPoint Thecombinationofthefrequency,dutycycle,andamplitudeofthevoltage
thatisappliedtothePrimaryCell.

OperatingVolume ThesetofPowerReceiverspatialpositionsatwhichthePowerTransmitter
cansustainapowertransfer.
NOTE:TheOperatingVolumevarieswiththePowerReceiverdesignaswellas
withthepowerlevel.
Policy AsetofrulesdefiningthebehaviourofaPowerReceiverdependingonthe
outcomeofAuthentication.
PotentialLoadPower ThehighestGuaranteedLoadPowerlevelthePowerTransmittercan
negotiate.
PowerConversionUnit ThefunctionalpartofaPowerTransmitterthatconvertselectricalenergy
toaPowerSignal.
PowerPick-upUnit ThefunctionalpartofaPowerReceiverthatconvertsaPowerSignalto
electricalenergy.
PowerProfile AsetoffeaturesthatdefineacompliancelevelofaPowerTransmitterora
PowerReceiver.
TheGeneralSectionofthebooksintheQiSpecificationliststhedefined
PowerProfiles.
PowerReceiver AsubsystemthatcanextractelectricpowerfromaPowerSignal.
PowerReceiverProduct AdevicecontainingaPowerReceiver.
PowerSignal Analternatingmagneticfield.
PowerTransferContract
Acollectionofsettingsandlimitsgoverningapowertransfer.
PowerTransmitter AsubsystemthatcangenerateaPowerSignal.
PowerTransmitterProduct AdevicecontainingoneormorePowerTransmitters.
PowerTransmitterProductUnit APowerTransmitterProductwithauniqueidentity.
PrimaryCell AsinglePrimaryCoiloracombinationofPrimaryCoilsthatareusedto
provideasufficientlyhighmagneticfluxthroughtheActiveArea.
PrimaryCoil AcomponentofaPowerTransmitterthatconvertselectriccurrentto
magneticflux.
ProductUnitCertificate ACertificatethatdescribesaPowerTransmitterProductUnit.Itonly
occursasaLeafCertificate.
Q-deflection VariationoftheQ-factorofPTxfromitsvaluewheninfreeair.
Q-test AlgorithmthatcalculatesQ-deflection.
ReceivedPower ThepowerfromthePowerSignaldissipatedbyanycomponentthatisan
integralpartofthePowerReceiverProduct.
ReferenceQualityFactor ThelowestqualityfactorofareferencePowerTransmitter'stankcircuit,
measuredwithaPowerReceiverpositionedinthereferencePower
Transmitter'sOperatingVolumeatfivereferencepositions.
NOTE:TheReferenceQualityFactorisadesignpropertyofthePowerReceiver
andapplieswiththePowerReceiverswitchedoff.

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