IEC 63254:2022

Management and interfaces for WPT - Device-to-device wireless charging (D2DWC) for mobile devices with wireless power TX/RX module

IEC 63254:2022 defines the specification and the control protocol of the D2DWC module for the use of wireless power TX and RX functions by a single device. The related antenna physical design examples for sharing information are presented in Annex A.
This document proposes the D2DWC module circuit requirement, which consists of the D2DWC main AP, D2DWC IC, the EMT/WPT antenna unit and the PMIC unit. In Clause 5, the register information and message protocols for WPT control are defined in order to implement the WPT TX function.
In this document, the interface and protocol in the wireless power process of the mobile device can be used in accordance with the corresponding wireless power transfer standard. Any wireless power transfer standard working within the 100 kHz to 350 kHz frequency range can be included in the scope of this document.
This document can be used for mobile wireless power transfer in mobile phones and other mobile devices, IoT devices, micro-sensor industries and related application fields.

Gestion et interfaces pour WPT - Chargement sans fil de dispositif à dispositif (D2DWC) pour dispositifs mobiles avec module TX/RX d'énergie sans fil

L'IEC 63254:2022 définit la spécification et le protocole de contrôle du module D2DWC pour l'utilisation des fonctions TX et RX d'énergie sans fil par un dispositif unique. Les exemples de conceptions physiques d'antenne connexes pour le partage d'informations sont donnés à l'Annexe A.
Le présent document établit les exigences relatives au circuit du module D2DWC, qui comprend l'AP D2DWC principal, l'IC D2DWC, l'unité d'antenne EMT/WPT et l'unité PMIC. L'Article 5 définit les informations de registre et les protocoles de message pour le contrôle WPT pour la mise en œuvre de la fonction TX WPT.
Dans le présent document, l'interface et le protocole du processus d'alimentation sans fil du dispositif mobile peuvent être utilisés conformément à la norme de transfert d'énergie sans fil correspondante. Toute norme de transfert d'énergie sans fil applicable dans la plage de fréquences comprise entre 100 kHz et 350 kHz peut être incluse dans le domaine d'application du présent document.
Le présent document peut être utilisé pour le transfert d'énergie sans fil dans les téléphones mobiles et autres dispositifs mobiles, dans les dispositifs d'IoT, les industries de microcapteurs et les domaines d'application connexes.

General Information

• Status: Published
• Publication Date: 27-Sep-2022
• ICS: 29.240.99 - Other equipment related to power transmission and distribution networks
• ICS: 33.160.01 - Audio, video and audiovisual systems in general
• Technical Committee: TA 15 - Wireless Power Transfer
• Drafting Committee: WG 1 - TC 100/TA 15/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 14-Oct-2022
• Completion Date: 28-Sep-2022

Standards Content (Sample)

IEC 63254
®

Edition 1.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Management and interfaces for WPT – Device-to-device wireless charging
(D2DWC) for mobile devices with wireless power TX/RX module

Gestion et interfaces pour WPT – Chargement sans fil de dispositif à dispositif
(D2DWC) pour dispositifs mobiles avec module TX/RX d'énergie sans fil

IEC 63254:2022-09(en-fr)

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63254

®


Edition 1.0 2022-09




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Management and interfaces for WPT – Device-to-device wireless charging

(D2DWC) for mobile devices with wireless power TX/RX module



Gestion et interfaces pour WPT – Chargement sans fil de dispositif à dispositif

(D2DWC) pour dispositifs mobiles avec module TX/RX d'énergie sans fil
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.240.99; 33.160.01 ISBN 978-2-8322-5703-6




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 63254:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 7
4 Operation scenarios . 8
4.1 Architecture . 8
4.2 Communication procedure for D2DWC . 9
4.2.1 General . 9
4.2.2 Total operation scenario of D2DWC . 9
4.2.3 TX operation scenario of D2DWC . 10
4.2.4 RX operation scenario of D2DWC . 11
5 Specifications and control protocol of D2DWC unit . 12
5.1 General control of a D2DWC unit of the TX-RX combined type . 12
5.1.1 General . 12
5.1.2 Purposes of WPT control of the D2DWC unit . 14
5.1.3 Operation control of the D2DWC unit . 14
5.2 Design guide for D2DWC TX-RX combined power transmitter . 17
5.3 Control protocol of D2DWC unit . 18
5.3.1 General . 18
5.3.2 WPT command . 19
5.3.3 D2DWC control . 20
5.3.4 Reply of D2DWC . 22
5.3.5 D2DWC parameter . 22
Annex A (informative) Antenna design guide for D2DWC TX-RX combined power
transmitter . 24
A.1 5-W-class WPT RX antenna . 24
A.1.1 General . 24
A.1.2 Antenna design guide . 24
A.1.3 Detailed specifications of circuit . 25
A.2 15-W-class WPT RX antenna design guide . 26
A.2.1 General . 26
A.2.2 Detailed specifications of circuit . 27
Annex B (informative) Regulation certification . 29
Bibliography . 30

Figure 1 – Overall architecture of the proposed EMT/WPT module. 8
Figure 2 – Operation scenario of D2DWC . 9
Figure 3 – TX operation scenario of D2DWC using battery power only . 10
Figure 4 – TX operation scenario of D2DWC using constant power supply . 11
Figure 5 – RX operation scenario of D2DWC . 12
Figure 6 – Wireless charging control architecture of the proposed standard . 13
Figure 7 – System operation efficiency . 14
Figure 8 – Operation diagram for D2DWC WPT . 14

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IEC 63254:2022 © IEC 2022 – 3 –
Figure 9 – D2DWC TX operation voltage diagram . 15
Figure 10 – D2DWC TX operation voltage diagram . 16
Figure 11 – D2DWC RX operable voltage/current diagram . 17
Figure 12 – Major function blocks of D2DWC . 18
Figure 13 – D2DWC unit wireless power transfer and control protocol of the MCU . 19
Figure A.1 – D2DWC TX/RX antenna of the 5-W-class WPT RX standard . 24
Figure A.2 – D2DWC TX/RX circuit diagram of the 5-W-class WPT RX specifications . 25
Figure A.3 – D2DWC TX/RX antenna of the 15-W-class WPT RX specifications . 26
Figure A.4 – D2DWC TX/RX circuit diagram of the 15-W-class WPT RX specifications . 27

Table 1 – Specifications for the TX operation of D2DWC unit . 13
Table 2 – WPT CMD fields . 19
Table 3 – WPT subcommands. 19
Table 4 – D2DWC Control Command fields . 20
Table 5 – Determination of the D2DWC wireless power transfer operation . 20
Table 6 – Determination of battery charging amount . 20
Table 7 – D2DWC unit temperature limit . 21
Table 8 – D2DWC unit voltage limit . 21
Table 9 – D2DWC unit current limit . 21
Table 10 – Operation setting when wireless charging stops . 21
Table 11 – Operation setting when an error occurs . 22
Table 12 – Responses of D2DWC Control CMDs . 22
Table 13 – D2DWC parameter command fields . 22
Table 14 – Output voltage field of D2DWC . 22
Table 15 – D2DWC output current field . 23
Table 16 – Current temperature of D2DWC unit . 23
Table 17 – Output current of the battery terminal . 23
Table 18 – Output current of battery terminal . 23
Table 19 – Risk state field of the D2DWC unit . 23
Table 20 – Desired minimum voltage of the D2DWC unit . 23
Table A.1 – D2DWC TX/RX antenna parameters of the 5-W-class WPT RX
specifications . 25
Table A.2 – Electric characteristics of the D2DWC TX/RX circuit of the 5-W-class WPT

RX specifications . 26
Table A.3 – D2DWC TX/RX antenna parameters of the 15-W-class WPT RX
specifications . 27
Table A.4 – Electric characteristics of the D2DWC TX/RX circuit of 15-W-class WPT
RX specifications . 28

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– 4 – IEC 63254:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MANAGEMENT AND INTERFACES FOR WPT –
DEVICE-TO-DEVICE WIRELESS CHARGING (D2DWC) FOR
MOBILE DEVICES WITH WIRELESS POWER TX/RX MODULE

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 63254 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.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3799/FDIS 100/3820/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.

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IEC 63254:2022 © IEC 2022 – 5 –
This document was drafted in accordance with ISO/IEC Directives, Part 2, and 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/standardsdev/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
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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– 6 – IEC 63254:2022 © IEC 2022
MANAGEMENT AND INTERFACES FOR WPT –
DEVICE-TO-DEVICE WIRELESS CHARGING (D2DWC) FOR
MOBILE DEVICES WITH WIRELESS POWER TX/RX MODULE



1 Scope
This document defines the specification and the control protocol of the D2DWC module for the
use of wireless power TX and RX functions by a single device. The related antenna physical
design examples for sharing information are presented in Annex A.
This document proposes the D2DWC module circuit requirement, which consists of the D2DWC
main AP, D2DWC IC, the EMT/WPT antenna unit and the PMIC unit. In Clause 5, the register
information and message protocols for WPT control are defined in order to implement the WPT
TX function.
In this document, the interface and protocol in the wireless power process of the mobile device
can be used in accordance with the corresponding wireless power transfer standard. Any
wireless power transfer standard working within the 100 kHz to 350 kHz frequency range can
be included in the scope of this document.
This document can be used for mobile wireless power transfer in mobile phones and other
mobile devices, IoT devices, micro-sensor industries and related application fields.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Terms and definitions
3.1.1
D2DWC
device-to-device wireless charging
wireless charging technology that uses a magnetic field-transmission function between mobile
devices, which can simultaneously perform wireless power TX and RX functions
3.1.2
D2DWC unit
IC that enables wireless power transmission/reception, and includes a magnetic
field-transmission function, mux, which allows the selection of WPT TX, and a transmission
inverter

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IEC 63254:2022 © IEC 2022 – 7 –
3.1.3
WPT
wireless power transfer
technology that wirelessly sends energy to a load with no transmission line by converting
electric energy to electromagnetic waves
Note 1 to entry: To convert electric energy to electromagnetic waves, the electric energy is converted to RF signals
of a specific frequency and the energy is transmitted through the electromagnetic waves generated from them.
3.1.4
EMT
elective magnetic transmission
technology for transmitting elective magnetic waves and is currently used to create and send
magnetic waves for magnetic billing service of mobile phones
3.1.5
PMIC
power-management IC
device for managing battery charging, which includes a boost function
3.1.6
SPI
serial peripheral interface
synchronized serial data connection standard for operation in full-duplex communication mode
3.1.7
UART
universal asynchronous receiver/transmitter
device for receiving and sending data after converting parallel data to serial data
3.1.8
2
I C Bus
inter-integrated circuit bus
protocol for transmitting clocks, data, and commands
3.1.9
WPC Class 0 specification
specification used to load the battery of devices such as mobile phones, tablets, and small
accessories
Note 1 to entry: It has a maximum transmission power of 15 W.
Note 2 to entry: Power class 0 is defined by the WPC (World Power Consortium).
3.2 Abbreviated terms
WPT wireless power transfer
TX transmitter
RX receiver
RFU reserved for future use
MCU micro controller unit

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– 8 – IEC 63254:2022 © IEC 2022
4 Operation scenarios
4.1 Architecture
This document proposes the physical definition and control information of modules for wireless
power transfer (WPT) between mobile devices that are operated by batteries instead of a
constant power supply and simultaneously support wireless power TX and RX. The total
architecture for the D2DWC technical standard proposed herein is shown in Figure 1.
To implement the features of the D2DWC, the following components are required:
a) D2DWC unit for performing magnetic field transmission function and wireless charging
TX/RX among mobile devices,
b) PMIC unit for battery charging,
c) EMT/WPT antenna unit for both EMT function and WPT TX/RX, and
d) microcontroller unit (MCU) for monitoring and controlling the D2DWC unit.
Among these components, the D2DWC unit consists of an EMT module, a WPT TX/RX module,
an EMP/WPT TX mux, and a power amp module. The EMT module can control and transmit
magnetic waveforms, and uses the same bandwidth as that of the frequencies specified in the
WPT for use in billing services, etc. The WPT TX/RX module has the functions to perform
wireless power transfer and reception. For WPT, it determines which magnetic field waveform
to send through the EMT module and mux. The EMT/WPT TX mux selects the waveform after
selecting the EMT and WPT TX signals. Finally, the power amp module sends the magnetic
field waveforms during EMT or WPT TX.
In order to examine each IC and module, for WPT, the D2DWC unit uses the mux to select and
send EMT and WPT TX, and a transmission inverter to generate and transmit magnetic fields,
which is shared between EMT and WPT. Furthermore, the WPT module can selectively perform
the TX/RX function. Outside of the D2DWC unit, there is one EMT/WPT antenna that shall be
used for three functions, for which the EMT and WPT functions shall be performed with the
same frequency. The antenna is shared for EMT and WPT functions, but the antenna can be
switched selectively depending on the EMT frequency. At a given frequency, the same antenna
may be used for both EMT and WPT TX. The optional EMT antenna is indicated to show the
selective change in the antenna length according to the impedance matching between the TX
and RX. Finally, the D2DWC unit is externally connected to the PMIC for battery charging, and
battery charging/discharging occurs during wireless power transfer and reception. Information
related to regulation and certification is presented in Annex B.

Figure 1 – Overall architecture of the proposed EMT/WPT module

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IEC 63254:2022 © IEC 2022 – 9 –
4.2 Communication procedure for D2DWC
4.2.1 General
In this document, WPT can be controlled in accordance with the WPT standard used by the
user, and the class 0 WPT in the WPC standard is used as an example. For this case, the total
operation procedure of the D2DWC and the WPT TX/RX operations are presented in 4.2.
4.2.2 Total operation scenario of D2DWC
The total operation scenario of D2DWC is shown in Figure 2. The user first makes contact
between the coil parts of the TX and RX devices to perform WPT. The D2DWC then sends a
2
command to drive the WPT function to the D2DWC unit connected via the I C interface. The
D2DWC unit reports the current charging amount to the user, who checks the charging amount
of the device's battery and determines the desired charging amount and speed. Once charging
starts, the WPT TX device draws power from the battery and applies power to the WPT TX coil
and the power is cut off in the RX coil. Wireless charging is performed between the WPT TX
and RX devices, which are controlled in accordance with the mobile TX/RX combined device
environment proposed in this document. Finally, when the power is transmitted for the amount
set in the command, wireless charging is stopped in the WPT TX.

Figure 2 – Operation scenario of D2DWC

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– 10 – IEC 63254:2022 © IEC 2022
4.2.3 TX operation scenario of D2DWC
The TX operation scenarios of D2DWC can be classified depending on the use of the boost
circuit of the PMIC module in the mobile device. Figure 3 illustrates the case of using battery
power only for the TX operation of D2DWC.

① When the start of WPT is notified by sending the WPT command to the D2DWC unit, the D2DWC operates in TX
mode.
② The D2DWC unit checks the battery connection to the PMIC interface and draws power for WPT.
③ The D2DWC unit carries out power transfer and communication to the RX through the TX coil in accordance with
the WPT standard.
④ Once the power specified in the WPT command is transmitted, the D2DWC unit stops sending power.
Figure 3 – TX operation scenario of D2DWC using battery power only
The second case of WPT TX operation is to supply constant power to the PMIC module in the
mobile device. Faster and more stable wireless charging is possible when constant power is
supplied. The TX operation scenario using a constant power supply is illustrated in Figure 4.
The difference from the case of using the battery circuit only is that the battery circuit is directly
blocked for wireless charging in the PMIC.

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IEC 63254:2022 © IEC 2022 – 11 –

① The WPT command is sent to the D2DWC unit to indicate the start of wireless charging, and the D2DWC operates
in TX mode.
② When wireless charging command is issued to the D2DWC unit, the PMIC directly blocks the direct connection
of the battery power.
③ The boost ci
...