prEN IEC 63758-12:2026

• 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 63758-12:2026 - Qi Specification - Version 2.3 - Part 12: Active alignment system (Fast Track)

prEN IEC 63758-12:2026 is a CLC committee draft for the Qi Specification, Version 2.3, Part 12: Active alignment system. It specifies the Active Alignment Power Profile (APP) for Qi products that use the magnetic protocol and active alignment. In practice, it tells transmitter-side product designers, compliance engineers, and test teams what an APP-compliant PTx product has to do for alignment, power transfer, communications, and foreign object detection.

What does prEN IEC 63758-12:2026 specify?

prEN IEC 63758-12:2026 defines the requirements of the active alignment power profile and allows use of the magnetic protocol for PTx products that use active alignment. The focus is on how a transmitter product detects alignment, corrects misalignment, and keeps operating within the Qi system model.

The document is organized into four main clauses:

• Clause 1 covers general rules, scope, compliance wording, references, and notation.
• Clause 2 introduces the terms used in the active alignment system.
• Clause 3 explains the system model, including coil design, coordinates, initial alignment, misalignment detection, cloaked alignment, and renewed alignment.
• Clause 4 gives the requirements for alignment behavior, LQK, power delivery, communications physical layer behavior, foreign object detection, and communications protocol identification.

Clause 1 also defines how numbers, tolerances, data packet fields, text strings, and shorthand packet references are written. That matters because the rest of the specification uses those conventions when defining data and behavior.

What are the key requirements of prEN IEC 63758-12:2026?

prEN IEC 63758-12:2026 is centered on a few practical requirements that shape product design and compliance testing. The most important points are the alignment target, the timing for alignment and realignment, and the need to remain compatible with the related Qi books for magnetics, power delivery, communications, and foreign object detection.

Alignment behavior and timing

• After active alignment is completed, the distance between the coil centers shall be 2 mm or less. This is the basic performance target: the transmitter has to bring the receiver coil into a close enough position for reliable power transfer.
• When a PRx product is mated to a PTx product, the PTx product shall execute and finish active alignment within 5 seconds. This sets the expected user-facing response time after placement.
• After a misalignment event, the PTx product shall execute and finish active alignment within 5 seconds. In practice, the system must recover quickly when the receiver moves.
• If a misalignment event does not cause loss of communications, the PTx product shall finish active alignment in the cloak phase of the magnetic protocol, with cloak reason “generic.” That means the design must support silent recovery without breaking the charging session.
• If a misalignment event causes loss of communications, the PTx product shall finish active alignment within 7 seconds. In that case, the system treats the situation as a renewed alignment and starts again from initial alignment.

System model and misalignment detection

Clause 3 describes the physical model behind APP-compliant PTx products. The system model is the same as for MPP-compliant products, except that the magnet ring and permeable magnet shunt are not present, and the distance from the top surface of the coil to the interface surface is 2 mm to accommodate a moving coil mechanism.

Clause 3.2 and 3.4 explain that the PTx product uses coordinates to track the PRx coil position. The transmitter stores the initial coordinates after mating, then compares later readings to detect movement. A change in inverter voltage above a threshold triggers cloak phase so the system can distinguish misalignment from foreign object effects. For implementers, this means alignment logic is tied to both electrical sensing and position tracking.

Compatibility with the rest of the Qi system

An APP-compliant PTx product shall comply with the LQK requirements detailed in MPPMagneticsDesign, specifically the magnetic boundary requirements for aligned and misaligned conditions. It also has to comply with the power delivery, communications physical layer, foreign object detection, and communications protocol requirements named in the related Qi books.

That matters because active alignment is not a stand-alone feature. A product has to work inside the wider Qi ecosystem and still meet the same power, signaling, and safety expectations as other compliant products.

Identification and protocol signaling

Clause 4.6.1 requires an APP-compliant PTx product to set the APP bit to ONE in the PTxXID data packet. This is the identification step that tells the rest of the system that the transmitter supports the active alignment profile. For interoperability, that bit is part of how receivers and other system elements know what behavior to expect.

What terms does prEN IEC 63758-12:2026 define?

• ActiveAlignment - The process of aligning the center of the PTx coil to the center of the PRx coil.
• ActiveAlignmentPowerProfile (APP) - The power profile used by PTx products that operate with the magnetic protocol and active alignment.
• MisalignmentEvent - An event that causes the center of the PRx coil to move out of alignment with the PTx coil.
• cloak phase - The phase of the magnetic protocol used while the transmitter distinguishes misalignment from other causes and, if possible, realigns without ending the session.
• renewed alignment - The recovery case used when communications are lost and the transmitter must treat the situation as a new mating instance.
• LQK - The magnetic boundary condition referenced by the APP requirements through MPPMagneticsDesign.
• PTxXID data packet - The packet used to identify the transmitter, including the APP bit required by this document.

Who uses prEN IEC 63758-12:2026?

prEN IEC 63758-12:2026 is used by companies and teams developing Qi wireless power transmitters with active alignment. That includes product designers, hardware engineers, firmware engineers, and test laboratories that need to verify coil positioning, alignment timing, and protocol signaling.

It is also relevant to quality managers, certification teams, and buyers who need to check whether a transmitter product is intended to support APP-compliant operation. The introduction places the work in the wider wireless power market, including flat-surface devices such as mobile phones and chargers, so the document is especially relevant to consumer electronics and accessory manufacturers.

Which standards are used with prEN IEC 63758-12:2026?

prEN IEC 63758-12:2026 is used together with these named Qi books and related references:

• Glossary, Acronyms, and Symbols - provides shared terminology used across the Qi specification set.
• MPPMagneticsDesign - supplies the LQK requirements and the magnetic boundary rules referenced by this part.
• MPPPowerDelivery - provides the power delivery requirements, including the PRx detection system mentioned in the system model.
• MPPCommunicationsPhysicalLayer - provides the physical-layer requirements for FSK and ASK behavior.
• MPPForeignObjectDetection - provides the foreign object detection requirements referenced for APP-compliant PTx products.
• MPPCommunicationsProtocol - provides the communications protocol rules, including the PTxXID data packet.
• ISO/IEC Directives, Part 2 - supplies the rules used here for verbal forms such as shall, should, may, and can.

What does the prEN IEC 63758-12:2026 document contain?

The document contains the general rules and notation for the Qi specification, then introduces the active alignment terminology and system model. It includes a simple coordinate-based model for coil alignment, plus figures showing initial alignment, misalignment detection, cloak phase behavior, and renewed alignment.

Clause 1 includes a table for verbal forms, a table and figure for data packet field interpretation, and examples of how numbers, text strings, and shorthand packet names are written. Clause 3 includes the coil assembly dimensions and several figures that illustrate the alignment process and the coordinate relationships.

Clause 4 is the technical core. It collects the active alignment requirements and links them to the related Qi books for magnetics, power delivery, communications physical layer behavior, foreign object detection, and transmitter identification.

SLOVENSKI STANDARD
01-november-2026
Specifikacija Qi - Različica 2.3 - 12. del: Sistem aktivnega poravnanja (hitri
postopek)
Qi Specification - Version 2.3 - Part 12: Active alignment system (Fast Track)
Ta slovenski standard je istoveten z: prEN IEC 63758-12:2026
ICS:
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.

100/4555/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63758-12 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
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
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 12: Active alignment system (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.

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
ActiveAlignmentSystem
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. General 5
1.1 StructureoftheQi Specification 5
1.2 Scope 6
1.3 Compliance 6
1.4 References 6
1.5 Conventions 7
1.5.1 Notationofnumbers 7
1.5.2 Tolerances 7
1.5.3 Fieldsinadatapacket 7
1.5.4 Notationoftextstrings 8
1.5.5 Short-handnotationfordatapackets 8
2. Introduction 9
2.1 Terminology 9
3. SystemModel 10
3.1 CoilDesign 10
3.2 CoordinateSystem 11
3.3 InitialAlignment 12
3.4 MisalignmentEventDetection 13
3.5 CloakedAlignment 14
3.6 RenewedAlignment 15
4. Requirements 16
4.1 ActiveAlignmentRequirements 16
4.1.1 TAAX001-ActiveAlignment 16
4.1.2 TAAX002-InitialAlignment 16
4.1.3 TAAX003-Realignment 16
4.1.4 TAAX004-CloakedAlignment 16
4.1.5 TAAX005-RenewedAlignment 16
4.2 LQK Requirements 17
4.3 PowerDeliveryRequirements 18
4.3.1 OperatingFrequency 18
4.3.2 DigitalPing 18
4.3.3 KEstimation 19
4.3.4 GainMeasurement 19
4.3.5 PowerTransferControl 19
4.3.6 MitigationofSideEffectsofCdatMPPFrequency 19
4.4 CommunicationsPhysicalLayerRequirements 20
4.4.1 FSK 20
4.4.2 ASK 20
4.5 ForeignObjectDetectionRequirements 21

4.5.1 MatedQ-DeflectionTest 21
4.5.2 MPPPowerLossAccounting 21
4.5.3 DPLOSS 22
4.6 CommunicationsProtocolRequirements 23
4.6.1 TCFG001-APP PTxIdentifier 23

1. General
TheWirelessPowerConsortium(WPC)isaworldwideorganizationthataimstodevelopandpromoteglobalstandards
forwirelesspowertransferinvariousapplicationareas.Animportantapplicationareacomprisesflat-surfacedevices
suchasmobilephonesandchargersoperatingatpowerlevelsupto25W.
1.1 StructureoftheQi Specification
Generaldocuments
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Introduction
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Glossary,Acronyms,andSymbols
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TechnicalSystemOverview
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PowerProfiles
Systemdescriptiondocuments
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Mechanical,Thermal,andUserInterface
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PowerDelivery
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CommunicationsPhysicalLayer
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CommunicationsProtocol
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ForeignObjectDetection
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NFCTagProtection
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AuthenticationProtocol
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MPPCommunicationsProtocol
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MPPMagneticsDesign
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MPP PowerDelivery
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MPP CommunicationsPhysicalLayer
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MPP ForeignObjectDetection
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MPP DesignGuidelines(Informative)
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MagneticCovers
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ActiveAlignmentSystem
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ThermalManagementProtocol
1.2 Scope
TheQiSpecification,ActiveAlignment System(this document)definestherequirementsoftheactivealignmentpower
profile,allowinguseofthemagneticprotocolforPTxproductsthatuseactivealignment.
1.3 Compliance
AllprovisionsintheQiSpecificationaremandatory,unlessspecificallyindicatedasrecommended,optional,note,
example,orinformative.VerbalexpressionofprovisionsinthisSpecificationfollowtherulesprovidedinISO/IEC
Directives,Part2.
Table1-Verbalformsforexpressionsofprovisions
Provision Verbalform
requirement “shall”or“shallnot”
recommendation “should”or“shouldnot”
permission “may”or“maynot”
capability “can”or“cannot”
1.4 References
Forundatedreferences,themostrecentlypublisheddocumentapplies.ThemostrecentWPCpublicationscanbe
downloadedfromhttp://www.wirelesspowerconsortium.com.

1.5 Conventions
1.5.1 Notationofnumbers
l
Realnumbersusethedigits0to9,adecimalpoint,andoptionallyanexponentialpart.
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Integernumbersindecimalnotationusethedigits0to9.
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Integernumbersinhexadecimalnotationusethehexadecimaldigits0to9andAtoF,andareprefixedby"0x"
unlessexplicitlyindicatedotherwise.
l
SinglebitvaluesusethewordsZEROandONE.
1.5.2 Tolerances
Unlessindicatedotherwise,allnumericvaluesintheQiSpecificationareexactlyasspecifiedanddonothaveany
impliedtolerance.
1.5.3 Fieldsinadatapacket
Anumericvaluestoredinafieldofadatapacketusesabig-endianformat.Bitsthataremoresignificantarestoredata
lowerbyteoffsetthanbitsthatarelesssignificant.Table2andFigure1provideexamplesoftheinterpretationofsuch
fields.
Table2-Exampleoffieldsinadatapacket(table)
b b b b b b b b
7 6 5 4 3 2 1 0
B (msb)
B 16-bitNumericDataField (lsb)
B OtherField
(msb)
B 16-bitNumericDataField (lsb)
Field
Figure1-Examplesoffieldsinadatapacket

1.5.4 Notationoftextstrings
TextstringsconsistofasequenceofprintableASCIIcharacters(i.e.intherangeof0x20to0x7E)enclosedindouble
quotes(").Textstringsarestoredinfieldsofdatastructureswiththefirstcharacterofthestringatthelowestbyte
offset,andarepaddedwithASCIINUL(0x00)characterstotheendofthefieldwherenecessary.
EXAMPLE: Thetextstring“WPC”isstoredinasix-bytefieldsasthesequenceofcharacters'W','P','C',NUL,NUL,and
NUL.Thetextstring“M:4D3A”isstoredinasix-bytefieldasthesequence'M',':','4','D','3',and'A'.
1.5.5 Short-handnotationfordatapackets
Inmanyinstances,theQiSpecificationreferstoadatapacketusingthefollowingshorthandnotation:
/
Inthisnotation,referstothedatapacket'smnemonicdefinedintheQiSpecification,Communications
Protocol,andreferstoaparticularvalueinafieldofthedatapacket.Thedefinitionsofthedatapacketsin
theQiSpecification,CommunicationsProtocol,listthemeaningsofthemodifiers.
Forexample,EPT/ccreferstoanEndPowerTransferdatapackethavingitsEndPowerTransfercodefieldsetto0x01.

2. Introduction
TheActiveAlignment System(thisbook)describesthesystemmodelandrequirementsforAPP-compliantPTxproducts,
thebenefitsofwhichinclude:
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Theexpansionofthemagneticprotocoltothewiderecosystem.
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EnsuringusersofMPP-compliantPRxproductsreceiveasimilarchargingexperienceregardlessofwhethera
...