kSIST FprEN IEC 63254:2022

Management and Interfaces for WPT - Device to device wireless charging (D2DWC) for mobile devices with wireless power TX/RX module (TA 15)

This standard defines specification and control protocol of D2DWC module for using wireless power TX and RX functions by only one single device. And the related antenna physical design examples are presented in Annex A for sharing information. This standard propose D2DWC module circuit requirement which are consisted with the D2DWC main AP, D2DWC IC, EMT/WPT Antenna Unit and PMIC unit. In the Chapter 5, ‘Specifications and control protocol of D2DWC’, the register information and message protocols for WPT control are defined in order to implement the WPT TX function. In this standard, 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 inside 100 - 350 kHz frequency range can be included from the scope of this standard. This standard can be used to mobile wireless power transfer in mobile phones and other mobile devices, IoT, and micro-sensor industries and related application fields.

Management und Schnittstellen für WPT – Drahtloses Laden von Gerät zu Gerät (D2DWC) für mobile Geräte mit drahtlosem Power TX/RX-Modul

Gestion et interfaces pour WPT - Chargement sans fil de dispositif à dispositif (D2DWC) pour dispositifs mobiles avec module TX/RX d'énergie sans fil (TA 15)

Upravljanje in vmesniki za WPT - Brezžično polnjenje med napravami (D2DWC) za mobilne naprave z brezžično napajalno močjo modula TX/RX (TA 15)

General Information

• Status: Not Published
• Public Enquiry End Date: 28-Mar-2021
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• ICS: 33.160.01 - Audio, video and audiovisual systems in general
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 22-Jul-2022
• Due Date: 09-Sep-2022
• Ref Project: FprEN IEC 63254:2022 - Management and Interfaces for WPT - Device to device wireless charging (D2DWC) for mobile devices with wireless power TX/RX module

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN IEC 63254:2021
01-marec-2021
Upravljanje in vmesniki za WPT - Brezžično polnjenje med napravami (D2DWC) za
mobilne naprave z brezžično napajalno močjo modula TX/RX (TA 15)

Management and Interfaces for WPT - Device to device wireless charging (D2DWC) for

mobile devices with wireless power TX/RX module (TA 15)

Gestion et interfaces pour WPT - Chargement sans fil de dispositif à dispositif (D2DWC)

pour dispositifs mobiles avec module TX/RX d'énergie sans fil (TA 15)
Ta slovenski standard je istoveten z: prEN IEC 63254:2021
ICS:
29.200 Usmerniki. Pretvorniki. Rectifiers. Convertors.
Stabilizirano električno Stabilized power supply
napajanje
33.160.01 Avdio, video in avdiovizualni Audio, video and audiovisual
sistemi na splošno systems in general
oSIST prEN IEC 63254:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 63254:2021
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oSIST prEN IEC 63254:2021
100/3534/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63254 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-01-08 2021-04-02
SUPERSEDES DOCUMENTS:
100/3415/CD, 100/3478A/CC
IEC TA 15 : WIRELESS POWER TRANSFER
SECRETARIAT: SECRETARY:
Korea, Republic of Mr Ock-Woo Nam
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

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.
TITLE:

Management and Interfaces for WPT - Device to device wireless charging (D2DWC) for mobile devices

with wireless power TX/RX module (TA 15)
PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:

Copyright © 2020 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

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.
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oSIST prEN IEC 63254:2021
IEC CDV 63254 © IEC 2020 2 100/3534/CDV
Rev Date Description
01 2018.12.14 Circulation to experts for review
02 2019.05.31 Circulation after modifying as DoC
03 2020.02.14 Circulation after modification as following 1 WD CRM
04 2020.08.03 Circulation after modification as following 1 CD
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oSIST prEN IEC 63254:2021
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20 CONTENTS

22 1. Scope ............................................................................................................................... 7

23 2. Normative references ....................................................................................................... 7

24 3. Definitions and terminology .............................................................................................. 7

25 4. Operation scenarios ......................................................................................................... 9

26 4.1. Architecture ............................................................................................................. 9

27 4.2. Communication procedure for D2DWC .................................................................. 10

28 4.2.1 Total operation scenario of D2DWC....................................................................... 10

29 TX operation scenario of D2DWC .......................................................................... 11

30 4.2.2 11

31 4.2.3 RX operation scenario of D2DWC .......................................................................... 12

32 5. Specifications and control protocol of D2DWC unit ......................................................... 13

33 5.1. General Control of D2DWC unit of the TX-RX combined type ................................ 13

34 5.1.1. Purposes of WPT control of the D2DWC unit ............................................. 15

35 5.1.2. Operation control of the D2DWC unit ......................................................... 15

36 5.2. Design guide for D2DWC TX-RX combined power transmitter ............................... 18

37 5.3. Control protocol of D2DWC unit ............................................................................. 19

38 5.3.1. WPT command .......................................................................................... 20

39 5.3.2. D2DWC control .......................................................................................... 21

40 5.3.3. Reply of D2DWC ....................................................................................... 24

41 5.3.4. D2DWC parameter .................................................................................... 24

42 Annex A (informative) Antenna Design guide for D2DWC TX-RX combined power

43 transmitter ...................................................................................................................... 28

44 A.1 5-W-class WPT RX antenna .................................................................................. 28

45 A.1.1 Antenna design guide ................................................................................ 28

46 A.1.2 Detailed specifications of circuit ................................................................ 29

47 A.2 15-W-class WPT RX antenna ................................................................................ 30

48 A.2.1 Detailed specifications of circuit ................................................................ 31

49 Figure 1 — Overall architecture of the proposed EMT/WPT module proposed in the

50 D2DWC technical standard ................................................................................................... 10

51 Figure 2 — Operation scenario of D2DWC ............................................................................ 11

52 Figure 3 — TX operation scenario of D2DWC using battery power only ................................ 11

53 Figure 4 — TX operation scenario of D2DWC using constant power supply .......................... 12

54 Figure 5 — RX operation scenario of D2DWC ....................................................................... 13

55 Figure 6 — Wireless charging control architecture of the proposed standard ........................ 14

56 Figure 7 — System operation efficiency defined in the proposed standard ............................ 15

57 Figure 8 — Operation diagram for D2DWC WPT of the proposed standard ........................... 15

58 Figure 9 — D2DWC TX operation voltage diagram of the proposed standard ........................ 16

59 Figure 10 — D2DWC TX operation voltage diagram of the proposed standard ...................... 17

60 Figure 11 — D2DWC RX operable voltage/current diagram of the proposed standard ........... 18

61 Figure 12 — Major function blocks of D2DWC of the proposed standard ............................... 19

62 Figure 13 — D2DWC unit wireless power transfer and control protocol of the MCU of

63 the proposed standard .......................................................................................................... 20

64 Figure A.1 — D2DWC TX/RX antenna of the 5-W-class WPT RX standard ........................... 28

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65 Figure A.2 — D2DWC TX/RX circuit diagram of the 5-W-class WPT RX specifications .......... 29

66 Figure A.2 — D2DWC TX/RX antenna of the 15-W-class WPT RX specifications .................. 30

67 Figure A.3 — D2DWC TX/RX circuit diagram of the 15-W-class WPT RX specifications ........ 31

69 Table 1 – Specifications for the TX operation of D2DWC unit ................................................ 14

70 Table 2 – WPT CMD fields .................................................................................................... 20

71 Table 3 – WPT subcommands .............................................................................................. 20

72 Table 4 – D2DWC Control Command fields ........................................................................... 21

73 Table 5 – Determination of the D2DWC wireless power transfer operation ............................ 21

74 Table 6 – Determination of battery charging amount ............................................................. 22

75 Table 7 – D2DWC unit temperature limit ............................................................................... 22

76 Table 8 – D2DWC unit voltage limit ....................................................................................... 22

77 Table 9 – D2DWC unit current limit D2DWC unit voltage limit ............................................... 23

78 Table 10 – Operation setting when wireless charging stops .................................................. 23

79 Table 11 – Operation setting when an error occurs ............................................................... 23

80 Table 12 – Responses of D2DWC Control CMDs .................................................................. 24

81 Table 13 – D2DWC parameter command fields ..................................................................... 24

82 Table 14 – Output voltage field of D2DWC ............................................................................ 24

83 Table 15 – D2DWC output current field ................................................................................. 25

84 Table 16 – Current temperature of D2DWC unit .................................................................... 25

85 Table 17 – Output current of the battery terminal .................................................................. 25

86 Table 18 – Output current of battery terminal ........................................................................ 25

87 Table 19 – Risk state field of the D2DWC unit....................................................................... 26

88 Table 20 – Desired minimum voltage of the D2DWC unit ...................................................... 26

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90 INTERNATIONAL ELECTROTECHNICAL COMMISSION
91 ____________
93 MANAGEMENT AND INTERFACES FOR WPT - DEVICE TO DEVICE
94 WIRELESS CHARGING (D2DWC) FOR MOBILE DEVICES
95 WITH WIRELESS POWER TX/RX MODULE
97 FOREWORD

98 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national

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127 shall not be held responsible for identifying any or all such patent rights.

128 International Standard IEC XXX has been prepared by subcommittee XX: TITLE, of IEC technical

129 committee XX:
130 The text of this standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
131

132 Full information on the voting for the approval of this standard can be found in the report on voting

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134 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

135 The committee has decided that the contents of this publication will remain unchanged until the stability

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137 publication. At this date, the publication will be
138 • reconfirmed,
139 • withdrawn,
140 • replaced by a revised edition, or
141 • amended.

142 The National Committees are requested to note that for this publication the stability date is ....

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143 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE DELETED AT THE

144 PUBLICATION STAGE.
145
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146 Management and Interfaces for WPT - Device to device wireless charging
147 (D2DWC) for mobile devices with wireless power TX/RX module
148
149 1. Scope

150 This standard defines specification and control protocol of D2DWC module for using wireless

151 power TX and RX functions by only one single device. And the related antenna physical

152 design examples are presented in Annex A for sharing information. This standard propose

153 D2DWC module circuit requirement which are consisted with the D2DWC main AP, D2DWC

154 IC, EMT/WPT Antenna Unit and PMIC unit. In the Chapter 5, ‘Specifications and control

155 protocol of D2DWC’, the register information and message protocols for WPT control are

156 defined in order to implement the WPT TX function. In this standard, the interface and

157 protocol in the wireless power process of the mobile device can be used in accordance with

158 the corresponding wireless power transfer standard. Any wireless power transfer standard

159 working inside 100 – 350 kHz frequency range can be included from the scope of this

160 standard. This standard can be used to mobile wireless power transfer in mobile phones and

161 other mobile devices, IoT, and micro-sensor industries and related application fields.

162
163 2. Normative references
164 Not applicable.
165
166 3. Definitions and terminology

167 For the purposes of this document, the following terms, definitions, and abbreviations apply.

168
169 3.1. Definitions and terminology
170 3.1.1.
171 D2DWC (Device-to-Device Wireless Charging)

172 D2DWC is wireless charging technology that uses a magnetic field-transmission function

173 among mobile devices, which can simultaneously perform wireless power TX and RX

174 functions.
175
176 3.1.2.
177 D2DWC unit

178 The D2DWC unit is an IC that enables wireless power transmission/reception, and includes a

179 magnetic field-transmission function, Mux, which allows the selection of WPT TX, and a

180 transmission inverter.
181
182 3.1.3.
183 WPT (Wireless Power transfer)

184 WPT is a technology that wirelessly sends energy to a load with no transmission line by

185 converting electric energy to electromagnetic waves. To convert electric energy to

186 electromagnetic waves, the electric energy is converted to RF signals of a specific frequency

187 and the energy is transmitted through the electromagnetic waves generated from them.

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188
189 3.1.4.
190 EMT (Elective Magnetic Transmission)

191 EMT is a technology for transmitting elective magnetic waves and is currently used to create

192 and send magnetic waves for magnetic billing service of mobile phones.
193
194 3.1.5.
195 PMIC (Power-Management IC)

196 PMIC is a power-management IC for battery charging and includes the boost function.

197
198 3.1.6.
199 SPI (Serial Peripheral Interface)

200 SPI is a synchronized serial data connection standard for operation in full-duplex

201 communication mode.
202
203 3.1.7.
204 UART (Universal Asynchronous Receiver/Transmitter)

205 UART is a universal asynchronous receiver/transmitter for receiving and sending data after

206 converting parallel data to serial data.
207
208 3.1.8.
209 I C Bus (Inter-Integrated Circuit Bus)

210 I C Bus is an inter-integrated circuit bus protocol for transmitting clocks, data, and commands.

211
212 3.1.9.
213 WPC Class 0 specification

214 Power class 0 is defined by WPC (Wireless Power Consortium). This class 0 specification is

215 used to load the battery of devices such as mobile phones, tablets, and small accessories. It

216 has a maximum transmission power of 15W.
217
218 3.2. Abbreviations
219 For the purposes of this document, the following abbreviations apply:
220 3.2.1.
221 WPT
222 Wireless Power Transmitter
223 3.2.2.
224 TX
225 Transmitter
226 3.2.3.
227 RX
228 Receiver
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229 3.2.4.
230 RFU
231 Reserved for Future Use
232
233 4. Operation scenarios
234 4.1. Architecture

235 This standard proposes the physical definition and control information of modules for wireless

236 power transfer (WPT) among mobile devices that are operated by batteries instead of a

237 constant power supply and simultaneously support wireless power TX and RX. The total

238 architecture for the D2DWC technical standard proposed herein is shown in figure 1.

239 To implement the features of the D2DWC, the following components are required: 1) D2DWC

240 unit for performing magnetic field transmission function and wireless charging TX/RX among

241 mobile devices, 2) PMIC unit for battery charging, 3) EMT/WPT antenna unit for both EMT

242 function and WPT TX/RX, and 4) microcontroller unit (MCU) for monitoring and controlling the

243 D2DWC unit.

244 Among them, the D2DWC unit consists of an EMT module, WPT TX/RX module, EMP/WPT

245 TX Mux, and Power Amp module. The EMT module can control and transmit magnetic

246 waveforms, and uses the same bandwidth as that of the frequencies specified in the WPT for

247 use in billing services, etc. The WPT TX/RX module has the functions to perform wireless

248 power transfer and reception. For WPT, it determines which magnetic field waveform to send

249 through the EMT module and Mux. The EMT/WPT TX Mux selects the waveform after

250 selecting the EMT and WPT TX signals. Finally, the Power Amp module sends the magnetic

251 field waveforms during EMT or WPT TX.

252 To examine each IC and module, for WPT, the D2DWC unit uses the Mux to select and send

253 EMT and WPT TX, and a transmission inverter to generate and transmit magnetic fields,

254 which is shared between EMT and WPT. Furthermore, the WPT module can selectively

255 perform the TX/RX function. Outside of the D2DWC unit, there is one EMT/WPT antenna that

256 must be used for three functions, for which the EMT and WPT functions must be performed

257 with the same frequency. The antenna is shared for EMT and WPT functions, but the antenna

258 can be switched selectively depending on the EMT frequency. At a given frequency, the same

259 antenna may be used for both EMT and WPT TX. The optional EMT antenna is indicated to

260 show the selective change in the antenna length according to the impedance matching

261 between the TX and RX. Finally, the D2DWC unit is externally connected to the PMIC for

262 battery charging, and battery charging/discharging occurs during the wireless power transfer

263 and reception.
264
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265 Figure 1 — Overall architecture of the proposed EMT/WPT module proposed in the D2DWC

266 technical standard
267
268 4.2. Communication procedure for D2DWC

269 In the D2DWC standard, WPT can be controlled in accordance with the WPT standard used

270 by the user, and the class-0 WPT in the WPC standard is used as an example. For this case,

271 the total operation procedure of the D2DWC and the WPT TX/RX operations are presented in

272 this section.
273 4.2.1 Total operation scenario of D2DWC

274 The total operation scenario of D2DWC is shown in figure 2. The user first makes contact

275 between the coil parts of the TX and RX devices to perform WPT. The D2DWC then sends a

276 command to drive the WPT function to the D2DWC unit connected via the I2C interface. The

277 D2DWC unit reports the current charging amount to the user, who checks the charging

278 amount of his/her device battery and determines the desired charging amount and speed.

279 Once charging starts, the WPT TX device draws power from the battery and applies power to

280 the WPT TX coil and the power is cut off in the RX coil. Wireless charging is performed

281 between the WPT TX and RX devices, which are controlled in accordance with the mobile

282 TX/RX combined device environment proposed in this standard. Finally, when the power is

283 transmitted for the amount set in the command, wireless charging is stopped in the WPT TX.

284
285
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286 Figure 2 — Operation scenario of D2DWC
287
288
289 4.2.2 TX operation scenario of D2DWC

290 The TX operation scenarios of D2DWC can be classified depending on the use of the boost

291 circuit of the PMIC module in the mobile device. Figure 3 illustrates the case of using battery

292 power only for the TX operation of D2DWC. ① When the start of WPT is notified by sending

293 the WPT command to the D2DWC unit, the D2DWC operates in TX mode. ② The D2DWC unit

294 checks the battery connection to the PMIC interface and draws power for WPT. ③ The

295 D2DWC unit carries out power transfer and communication to the RX through the TX coil in

296 accordance with the WPT standard. ④ Once the power specified in the WPT command is

297 transmitted, the D2DWC unit stops sending power.
298
299
300 Figure 3 — TX operation scenario of D2DWC using battery power only
301

302 The second case of WPT TX operation is to supply constant power to the PMIC module in the

303 mobile device. Faster and more stable wireless charging is possible when constant power is

304 supplied. The TX operation scenario using a constant power supply is illustrated in figure 4.

305 The difference from the case of using the battery circuit only is that the battery circuit is

306 directly blocked for wireless charging in the PMIC. ① The WPT command is sent to the

307 D2DWC unit to indicate the start of wireless charging, and the D2DWC operates in TX mode.

308 ② When wireless charging command is issued to the D2DWC unit, the PMIC directly blocks

309 the direct connection of the battery power. ③ The boost circuit of the PMIC powers on and ④

310 the boosted power is input to Vext of the D2DWC unit, preparing for wireless charging. ⑤ The

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311 D2DWC unit carries out power transfer and communication to the RX through the TX coil in

312 accordance with the WPT standard. ⑥ When the specified amount of power has been

313 transmitted in the WPT command, the D2DWC unit stops power transfer.
314
315 Figure 4 — TX operation scenario of D2DWC using constant power supply
316
317 4.2.3 RX operation scenario of D2DWC

318 The RX operation scenario of D2DWC is illustrated in figure 5. The D2DWC unit is always

319 waiting in RX mode until it receives a separate wireless charging command. ① When power

320 reception and communication occur in TX mode, the D2DWC unit starts preparing to receive

321 wireless power. ② When the power stabilizes, the Vout terminal outputs power. ③ Battery

322 charging begins through the charger IC. ④ Charging is carried out until power transfer from

323 the TX stops.
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324
325 Figure 5 — RX operation scenario of D2DWC
326
327 5. Specifications and control protocol of D2DWC unit
328
329 5.1. General Control of D2DWC unit of the TX-RX combined type

330 To aid in understanding, this section uses the class-0 specification of the WPC standard and

331 PMA TX ver. 1.2 standard as examples. The D2DWC unit which supports wireless power

332 TX/RX in a single device requires additional control compared to class-0 of the WPC standard.

333 The D2DWC unit performs WPT in accordance with the WPT standard, but if the TX and RX

334 are combined in one device, conditions such as the voltage, current, and temperature vary

335 and are controlled by the MCU. The D2DWC unit reports the current state to the MCU while

336 carrying out message and data TX and RX for WPT. The MCU monitors the WPT of the

337 D2DWC and stops WPT if the device operates within the scope specified in this standard. The

338 overall architecture is shown in figure 6. During the WPT, the device operates in accordance

339 with the WPT standard. When the D2DWC unit is used, the operations need to be controlled

340 with more detailed specifications because the unit combines WPT TX and RX. This can be

341 controlled by any control unit that can transmit messages, such as I2C, SPI, or UART. In this

342 this standard, a control protocol using I2C is presented as an example in chapter 5.3.

343
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344
345 Figure 6 — Wireless charging control architecture of the proposed standard
346

347 The specifications when the D2DWC IC is operated in TX mode are listed in table 1. The

348 specifications for operation based on experimental values were established in accordance

349 with the specifications of EMT TX and WPC TX class-0 of mobile devices and the PMA TX ver.

350 1.2. Furthermore, the system operation efficiency defined in this standard is presented in

351 figure 7, which is defined by the ratio of the TX input power to the RX output power.

352 In the revised standard, the specifications of the D2DWC unit are redefined for medium-power

353 operation of up to 15 W to support charging from a notebook computer to a mobile phone and

354 fast charging for mobile devices. Furthermore, to support the PMA standard of Airfuel, which

355 is a de facto standardization organization, the frequency operation of 100–350 kHz,

...