IEC 62827-2:2017

Wireless power transfer - Management - Part 2: Multiple device control management

IEC 62827-2:2017, defines a wireless power management protocol for wireless power transfer to multiple devices in a wireless power management system. Various functions of wireless power management systems are justified. The wireless power management frames and messages that work between the management block of a power source and the management block or the coupler block of a device, or the coupler block of a power source, are defined as well to execute various functions. Also, the procedures for each functionality are described based on its frames and messages.

Transfert de puissance sans fil - Gestion - Partie 2: Gestion du contrôle de dispositifs multiples

L'IEC 62827-2:2017 définit un protocole de gestion de puissance sans fil pour le transfert de puissance sans fil à plusieurs dispositifs dans un système de gestion de puissance sans fil. Plusieurs fonctions de systèmes de gestion de puissance sans fil sont expliquées. Les trames et messages de gestion de puissance sans fil qui fonctionnent entre le bloc de gestion d’une source d’alimentation et le bloc de gestion ou le bloc coupleur d’un dispositif, ou le bloc coupleur d’une source d’alimentation, sont également définis afin d’exécuter différentes fonctions. Les procédures pour chaque fonctionnalité sont également décrites en fonction de leurs trames et messages.

General Information

• Status: Published
• Publication Date: 18-Jun-2017
• ICS: 29.240.99 - Other equipment related to power transmission and distribution networks
• ICS: 33.160.99 - Other audio, video and audiovisual equipment
• ICS: 35.100.01 - Open systems interconnection 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: 30-Jun-2017
• Completion Date: 19-Jun-2017

Overview

IEC 62827-2:2017 - Wireless power transfer - Management - Part 2: Multiple device control management specifies a wireless power management protocol for coordinating wireless power transfer (WPT) to multiple devices within a wireless power management system (WPMS). The standard defines the roles and interactions of the management block of a power source and the management or coupler block of devices (and coupler block of the source), the structure of management frames and messages, and the procedures required to perform multiple-device control functions.

Keywords: IEC 62827-2:2017, wireless power transfer, multiple device control management, wireless power management protocol, WPMS.

Key Topics and Technical Requirements

• Functional scope: Initialization, association, WPT eligibility checks, general charging management (simultaneous, sequential, foaming, compound WPT), inter-device WPT, abnormal-status handling, and termination procedures.
• Protocol elements: Definition of frame formats, payload structure, frame types (data, acknowledgement), and data block types (request, response, notification).
• Identification and addressing: ID structures including unique coupler ID (UCID), group ID, WPMS ID and device ID for addressing and group management.
• Procedural rules: Step‑by‑step procedures for association, Group ID setup, scheduling/control of coils, sensing (current/voltage), full-charge and termination notifications, and abnormal condition management.
• Interoperability focus: Compatibility modes (direct and indirect control) and message APIs between application, management (MGMT), MAC, and coupler blocks to support multi-vendor implementations.
• Security & robustness (protocol-level): Authentication and management messages for safe WPT session establishment and abnormal-state handling (as described in message and procedure clauses and annexes).

Practical Applications

IEC 62827-2:2017 is applicable wherever a power source needs to manage wireless charging of multiple devices reliably and safely:

• Multi-device wireless charging pads and furniture-integrated chargers
• Public or commercial charging surfaces (airports, cafés, retail)
• Device hubs and docking stations managing several client devices
• Smart home and office surfaces that coordinate simultaneous or scheduled charging
• Systems requiring inter-device power transfer or device-to-device charging coordination

These use cases benefit from the standard’s definitions for scheduling, group control, device status reporting, and termination notifications.

Who should use this standard

• Hardware and firmware engineers designing WPMS controllers, coupler modules and power-source management blocks
• System integrators and product managers building multi-device wireless charging products
• Test laboratories and certification bodies validating interoperability and protocol compliance
• Standards bodies and technical leads aligning product families to IEC wireless-power management practices

Related Standards

• Other parts of the IEC 62827 series and complementary IEC/industry wireless power standards (refer to IEC catalogue for latest cross-references).

Standards Content (Sample)

IEC 62827-2 ®
Edition 1.0 2017-06
INTERNATIONAL
STANDARD
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Wireless power transfer – Management –
Part 2: Multiple device control management

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IEC 62827-2 ®
Edition 1.0 2017-06
INTERNATIONAL
STANDARD
colour
inside
Wireless power transfer – Management –

Part 2: Multiple device control management

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.99; 33.160.99; 35.100.01 ISBN 978-2-8322-4445-6

– 2 – IEC 62827-2:2017 © IEC 2017

CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 9
3.1 Definitions. 9
3.2 Abbreviated terms . 11
4 Overview . 11
5 Functionalities . 13
5.1 General . 13
5.2 Compatibility . 13
5.2.1 General . 13
5.2.2 Indirect control . 14
5.2.3 Direct control . 14
5.3 Initialization . 14
5.3.1 General . 14
5.3.2 Frequency band scan . 14
5.3.3 Initiation power transfer . 14
5.4 Association . 14
5.4.1 General . 14
5.4.2 Communication connection . 14
5.4.3 WPT eligibility check . 14
5.5 General charging management . 15
5.5.1 General . 15
5.5.2 Simultaneous WPT . 15
5.5.3 Sequential WPT . 15
5.5.4 Foaming WPT . 15
5.5.5 Compound WPT . 15
5.6 Abnormal status management . 15
5.6.1 General . 15
5.6.2 Source status detection . 16
5.6.3 Device status detection . 16
5.7 Inter–device WPT management . 16
5.8 Termination . 17
6 Protocols . 17
6.1 General . 17
6.2 ID structure . 17
6.2.1 Unique coupler ID . 17
6.2.2 Group ID . 18
6.2.3 Wireless Power management system ID . 18
6.2.4 Device ID . 18
6.3 Frame format . 18
6.3.1 General . 18
6.3.2 Frame header . 19
6.3.3 Frame body . 19

6.4 Frame type . 20
6.4.1 General . 20
6.4.2 Data frame . 20
6.4.3 Acknowledgement frame . 20
6.5 Payload format . 21
6.5.1 General . 21
6.5.2 Data frame . 21
6.6 Data block . 22
6.6.1 General . 22
6.6.2 Request block . 22
6.6.3 Response block . 24
6.6.4 Notification block . 25
7 Procedures . 27
7.1 General . 27
7.2 Association . 27
7.3 Group ID Set–up . 28
7.4 General WPT management . 28
7.4.1 Simultaneous WPT . 28
7.4.2 Sequential WPT . 29
7.4.3 Foaming WPT . 30
7.4.4 Compound WPT . 31
7.5 Abnormal situations management . 32
7.5.1 General . 32
7.5.2 Source status detection . 32
7.5.3 Device status detection . 33
7.6 Inter–device WPT management . 34
7.7 Termination . 35
Annex A (informative) Messages . 36
A.1 General . 36
A.2 API between application and APP block . 36
A.2.1 General . 36
A.2.2 ID display . 36
A.2.3 Power status display . 36
A.2.4 WPT mode selection display . 37
A.2.5 Scheduling information display . 38
A.2.6 Abnormal situations display . 39
A.3 Interface between MGMT and MGMT . 39
A.3.1 General . 39
A.3.2 WPMS–D identification . 40
A.3.3 WPT authentication . 40
A.3.4 Zone recognition . 42
A.3.5 WPT mode . 42
A.3.6 Scheduling information . 43
A.3.7 Abnormal situations management . 44
A.3.8 WPMS–D full charge notification . 44
A.3.9 WPT termination notification . 45
A.3.10 Inter–device WPT . 45
A.4 Interface between MGMT block and APP block . 46
A.4.1 General . 46

– 4 – IEC 62827-2:2017 © IEC 2017
A.4.2 Data request . 46
A.5 Interface between APP layer and MAC layer . 47
A.5.1 General . 47
A.5.2 MAC identification request . 48
A.6 Interface between MGMT block and Coupler Block . 48
A.6.1 General . 48
A.6.2 Scheduling control . 48
A.6.3 Current/voltage sensing . 49
A.6.4 Abnormal situation control . 49
A.6.5 WPT termination control . 50
A.6.6 Full charge . 50
A.6.7 Inter-device WPT . 51

Figure 1 – Usage examples of WPMS services . 12
Figure 2 – WPMS structure . 13
Figure 3 – Function of inter–device WPT management . 17
Figure 4 – UCID structure . 17
Figure 5 – Frame format . 19
Figure 6 – Data frame format . 20
Figure 7 – Acknowledgement frame format . 20
Figure 8 – Payload format of data frame . 21
Figure 9 – Block format of device status request . 23
Figure 10 – Block format of WPT request . 23
Figure 11 – Block format of coil control request . 23
Figure 12 – Block format of Group ID set–up request . 23
Figure 13 – Block format of inter–device WPT request . 24
Figure 14 – Block format of connection response . 24
Figure 15 – Block format of device status response . 24
Figure 16 – Block format of WPT response . 24
Figure 17 – Block format of coil control response . 25
Figure 18 – Block format of coil control response . 25
Figure 19 – Block format of inter–device WPT response . 25
Figure 20 – Block format of COM ID notification . 25
Figure 21 – Block format of WPT ID notification . 26
Figure 22 – Block format of WPT mode notification . 26
Figure 23 – Block format of WPT schedule notification . 26
Figure 24 – Block format of WPT termination request . 26
Figure 25 – Block format of full charge notification . 26
Figure 26 – Block format of discharge rate variation notification . 27
Figure 27 – Association . 27
Figure 28 – Group ID set–up . 28
Figure 29 – Simultaneous WPT . 29
Figure 30 – Sequential WPT . 30
Figure 31 – Foaming WPT . 31
Figure 32 – Compound WPT . 32

Figure 33 – Source status detection . 33
Figure 34 – Full charge detection . 34
Figure 35 – Discharge rate variation detection . 34
Figure 36 – Inter–device WPT . 35
Figure 37 – Termination . 35

Table 1 – Group ID . 18
Table 2 – ID structure . 18
Table 3 – Frame type value . 20
Table 4 – Data codes . 22
Table A.1 – Values for ID display . 36
Table A.2 – Values for power status display . 37
Table A.3 – Values for WPT mode selection display. 38
Table A.4 – Values for scheduling information display . 38
Table A.5 – Values for abnormal situation display . 39
Table A.6 – Values for WPMS–D identification . 40
Table A.7 – Values for WPT authentication . 41
Table A.8 – Values for WPMS–D power status information . 41
Table A.9 – Values for zone recognition . 42
Table A.10 – Values for WPT mode . 43
Table A.11 – Values for scheduling information . 43
Table A.12 – Values for abnormal situations management . 44
Table A.13 – Values for WPMS–D full charge notification . 45
Table A.14 – Values for WPT termination notification . 45
Table A.15 – Values for inter-device WPT . 46
Table A.16 – Values for data request . 47
Table A.17 – Values of MAC identification . 47
Table A.18 – Mac Type code. 48
Table A.19 – Values for scheduling control . 48
Table A.20 – Values for current/voltage sensing . 49
Table A.21 – Values for abnormal situation control . 50
Table A.22 – Values for WPT termination control . 50
Table A.23 – Value for full charge notification . 51
Table A.24 – Values for inter-device WPT . 51

– 6 – IEC 62827-2:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIRELESS POWER TRANSFER – MANAGEMENT –

Part 2: Multiple device control management

FOREWORD
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International Standard IEC 62827-2 has been prepared by technical area 15: Wireless power
transfer, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
100/2900/FDIS 100/2939/RVD
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– 8 – IEC 62827-2:2017 © IEC 2017
INTRODUCTION
The IEC 62827 (Wireless Power Transfer – Management) series provides the management
protocol for a wireless power transfer system in which power sources can deliver power to
receivers at a distance. The IEC 62827 series consists of the following parts:
• Part 1: Common components
• Part 2: Multiple device control management
• Part 3: Multiple source control management
Part 1 of IEC 62827 defines the definition and functionality for wireless power transfer
systems.
Part 2 of IEC 62827 specifies the management protocol of wireless power transfer for multiple
devices.
Part 3 of IEC 62827 specifies the management protocol of wireless power transfer for multiple
sources.
WIRELESS POWER TRANSFER – MANAGEMENT –

Part 2: Multiple device control management

1 Scope
This part of IEC 62827 defines a wireless power management protocol for wireless power
transfer to multiple devices in a wireless power management system. Various functions of
wireless power management systems are justified. The wireless power management frames
and messages that work between the management block of a power source and the
management block or the coupler block of a device, or the coupler block of a power source,
are defined as well to execute various functions. Also, the procedures for each functionality
are described based on its frames and messages.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 62827-1, Wireless power transfer – Management – Part 1: Common components
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms and definitions given in IEC 62827-1 and the
following 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 Definitions
3.1.1
COM ID
ID which is allocated to power a receiver within the wireless data communication zone of the
wireless power source
3.1.2
wireless data communication zone
area where a wireless power source can transfer data to wireless power receivers without
physical contact
3.1.3
wireless power management frame
format of the data which is exchanged between a wireless power source and a wireless power
receiver
– 10 – IEC 62827-2:2017 © IEC 2017
3.1.4
wireless power management message
data which is exchanged between a wireless power source and a wireless power receiver
3.1.5
wireless power management protocol
set of rules which determines how a wireless power source communicates with wireless power
receivers in the wireless power management system
3.1.6
wireless power management system
management system that is capable of transferring electric power from either one or multiple
wireless power source(s) to either one or multiple wireless power device(s) with wireless
communication
Note 1 to entry: In the event that areas or regions, where both data and power can be transferred, are
emphasized, the term “Wireless Power Transfer Network” may be used.
3.1.7
wireless power management system
wireless power receiver that can receive electric power from wireless power sources
3.1.8
wireless power management system
wireless power relay transmitter that can transfer electric power from one or
multiple wireless power source(s) to one or multiple wireless power receiver(s)
3.1.9
wireless power management system
wireless power source that can transfer electric power to a number of wireless
power receivers or relay transmitters
3.1.10
wireless power receiver
device that receives electric power wirelessly
3.1.11
wireless power source
transmitter that delivers electric power to power receiver
3.1.12
wireless power transfer
transfer of electric power without the physical contact of electrodes
3.1.13
wireless power transfer system
system that wirelessly transfers electric power from a wireless power source to a wireless
power receiver
3.1.14
wireless power transfer zone
area where a wireless power source can transfer electric power to wireless power receivers
without physical contact
3.1.15
WPT ID
ID which is allocated to the device within the wireless power transfer zone of wireless power
source
3.2 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply:
ABNR abnormal
API application programming interface
APP application
DMTC device management to coupler
DST destination
ELGB eligibility
MAC medium access control
MFAN magnetic field area network
MGMT management
MTM MGMT to MGMT
NFC near field communication
PHY physical
RFID radio frequency identification
RSSI received signal strength indicator
RX receiving
RxPower received power
SCHDL scheduling
SMTA source management to application
SRC source
UCID unique coupler ID
WDCZ wireless data communication zone
WPMS wireless power management system
WPMS–D wireless power management system – device
WPMS ID wireless power management system identification
WPMS–R wireless power management system – repeater
WPMS–S wireless power management system – source
WPT wireless power transfer
WPTS wireless power transfer system
WPTZ wireless power transfer zone
4 Overview
WPMS, which is defined in IEC 62827-1, is a management protocol system for wireless power
transfer to a number of WPMS–Ds. WPT is a technology that replaces the conventional wired
charging method with wireless charging. It utilizes the characteristics of magnetic fields and
electric fields to deliver power wirelessly. In the market, there are a large number of wireless
charging devices, designed under various kinds of protocols, which are not interoperable. The
inconvenience it causes to users could cost an unnecessary large sum of money, and
uneconomical expenditure. WPMS aims to provide consumers of wireless charging devices an
option to be able to fully utilize a system that is compatible with a number of existing
technologies. Also, to break away from conventional 1:1 wireless charging (1:1 WPT), WPMS
will be managing power transfer to multiple WPMS–Ds at a time (1:N WPT), using various
WPT modes.
– 12 – IEC 62827-2:2017 © IEC 2017

IEC
Figure 1 – Usage examples of WPMS services
• The WPMS technology can be applied to the following industry fields, and others that
require a constant power supply. WPMS services can be provided as shown in Figure
1.Mobile terminals: charging services can be provided within mobile terminals anytime and
anywhere.
• Home appliances: to make entangled cable mess neat and convenient, the use of WPMS
technology can offer the benefits of minimal wiring and freedom of furniture arrangement.
In order to provide effective WPT to multiple WPMS–Ds, a proper management protocol shall
be thoroughly structured as shown in Figure 2. This protocol enables WPMS–S or WPMS–R
to control WPMS–Ds for efficient WPT process, regardless of MAC and PHY types. Under the
structure of WPMS, it will be able to incorporate both out-band WPT systems, which use Wi-Fi,
Bluetooth, ZigBee, NFC, RFID etc., and in-band WPT systems, which use MFAN etc. The
WPMS can exchange the messages between such blocks as APP block, MGMT block and
coupler block. See Annex A for additional information. It shall have the system structure
shown in Figure 2.
WPMS-S TPnneling WPMS-D
APP block APP block
APP APP
MAC MAC
MGMT MGMT
Layer Layer
PHY PHY
Coupler Coupler
Coupler Coupler
block block
OPt of
Scope
IEC
Figure 2 – WPMS structure
In order to efficiently provide WPT services to multiple WPMS–Ds, a proper signalling system
is required; it shall be incorporated for the exchange of WPT data and control signals. For the
compatibility of the WPT, users may select various frequency bands for the WPT as well.
Within the WPMS's range, WPMS–Ss or WPMS–Rs can provide WPTs with several watts to
several hundred watts. The closer the distance between WPMS–Ss and WPMS–Ds, the
greater the efficiency becomes. As shown in Figure 1, provided that enough infrastructure is
installed, an omnipresent charging environment is created.
Functions like optimal WPT mode selection are included for the best WPT efficiency. Also, the
WPMS includes emergency controls that provide counter-measures to contingencies, such as
sudden WPMS–D detection and disappearance. General WPT environments are controlled by
WPMS–Ss, which manage connection, separation, and release of WPMS–Ds. In order to
increase the efficiency of WPMS, WPTS can use in band communication which utilizes the
frequency to transfer data as well as power.
5 Functionalities
5.1 General
In order to design a management protocol that can construct reliable and efficient WPTS for
multiple WPMS–Ds, it needs to include all the fundamental functions, yet not repetitively. In
WPMSs, there are two ways of controlling compatibility: indirect control and direct control.
Also, functions are categorized into six distinctive functions. They are initialization,
association, general WPT management, abnormal WPT management, inter–device WPT
management, and termination.
5.2 Compatibility
5.2.1 General
There are two ways of control, depending on the compatibility with WPTS and WPMS. If
WPTS does not support WPMS, WPMS will control indirectly; otherwise, it will control directly.

– 14 – IEC 62827-2:2017 © IEC 2017
5.2.2 Indirect control
Under indirect control, a WPMS-S detects nearby a WPMS-D through a frequency scan. Once
detected, a WPMS-S will at least acknowledge the number and type of WPMS-Ds within its
range. WPMS-S will manage WPMS-Ds only as they are defined in each WPTS specification.
5.2.3 Direct control
If WPMS application is compatible with WPTS, direct control can be used. In this case, the
application can communicate with WPTS to receive various pieces of information from it. As a
consequence, a WPMS-S can manage the entire WPMS more effectively. In order to fully
utilize direct control, there shall be appropriate adjustments to each WPTS specification.
5.3 Initialization
5.3.1 General
Before a WPMS-S can initiate a WPT service to multiple WPMS–Ds, establishing
communication with WPMS-Ds should precede.
5.3.2 Frequency band scan
To identify WPMS-Ds within the WPTZ, the WPMS-S periodically broadcasts connection
requests to match with all WPMS-Ds of diverse frequency bands. The broadcasting is
processed in in-band and out-band scans in order to support diverse types of WPMS-Ds.
5.3.3 Initiation power transfer
When there is not a single WPMS-D detected from the frequency band scan, the WPMS-S
considers the possibility of a powered down WPMS-D. To wake up powered down WPMS-Ds
if there are any, the WPMS-S periodically transfers initiation power in several frequencies,
when there is no WPMS-D associated to the WPMS-S. When there are WPMS-Ds in the
WPMS that is currently receiving the WPT, the ongoing WPT may wake up powered down
WPMS-Ds.
5.4 Association
5.4.1 General
Once WPMS-Ds have been initiated, they need to be associated by WPMS-S to be properly
scheduled for efficient WPT.
5.4.2 Communication connection
Once WPMS–Ds are detected from frequency band scans, the WPMS–S sends connection
requests to WPMS–Ds. WPMS–Ds that have received a connection request will reply back to
WPMS–S with their addresses. The WPMS–S will check on the received device address, and
register the address. Accordingly, the WPMS–S will allocate a COM ID to each WPMS–D.
5.4.3 WPT eligibility check
As a WPMS–D is connected to the WPMS–S and allocated a COM ID, the WPMS–S will
request it’s the device status of the WPMS–D – frequency, battery information, received
signal strength, and so on. The WPMS–D will return information in response data. With the
data, the WPMS–D calculates eligibility with various factors, such as the distance to WPMS–
Ds. Consequently, the WPMS–S will inform the WPMS–Ds whether they are eligible for WPT
or not. According to the result of the eligibility check, the final candidate for WPT service will
be determined, and receive WPT ID.

5.5 General charging management
5.5.1 General
When more than one authenticated WPMS–D is within the WPTZ, the WPMS–S initiates the
WPT service. Distinctively, there are four modes for WPT in WPMS: simultaneous WPT mode,
sequential WPT mode, foaming WPT mode, and compound WPT mode. The user may
configure any of the modes according to charging status of WPT.
5.5.2 Simultaneous WPT
When there is one WPMS–D for WPT, or if the user wishes to transfer power with multiple
WPMS–Ds, simultaneous WPT mode will be selected. In this mode, WPMS–S broadcasts
wireless power to all WPMS–Ds within the WPTZ at the same time. For fine tuning, test power
is transferred to WPMS–Ds before proper WPT. The efficiency is calculated after receiving
reception power level from WPMS–Ds. Accordingly, the WPMS–S calculates optimal
impedance matching, and WPT is performed to all WPMS–Ds within the WPTZ. The process
continues unless WPT is terminated.
5.5.3 Sequential WPT
When there are multiple WPMS–Ds, the user may choose to precede WPT in sequential WPT
mode. In this mode, the WPMS–S will divide WPT period into several time slots, and allocate
each time slot to each WPMS–D to maximize WPT efficiency. The WPMS–S will inform the
WPMS–Ds of the WPT schedule: when to turn on and off the coupler antenna. For each
individual WPT in each time slot, an optimal impedance matching is carried out for maximum
efficiency. The sequential WPT cycle is terminated when the WPT of the last time slot is
completed.
5.5.4 Foaming WPT
When there are multiple WPMS–Ds, the user may choose to precede WPT in foaming WPT
mode. In this mode, power is transferred to multiple WPMS–Ds, but it is focused onto
designated WPMS–Ds with a greater efficiency. The WPMS–S with received device statuses
calculates priority and transfers power according to the priority, either by sequential or
simultaneous WPT mode. It can be done by allocating various time divisions, using a different
number of coils, and so on. A foaming WPT cycle is terminated at the same point as where
simultaneous and sequential WPT modes are completed.
5.5.5 Compound WPT
When there are multiple WPMS–Ds, the user may choose to precede WPT in compound WPT
mode, a combination of simultaneous, sequential, and foaming WPT. In this mode, a WPMS–
S may und
...

IEC 62827-2 ®
Edition 1.0 2017-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wireless power transfer – Management –
Part 2: Multiple device control management

Transfert de puissance sans fil – Gestion –
Partie 2: Gestion du contrôle de dispositifs multiples

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IEC 62827-2 ®
Edition 1.0 2017-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wireless power transfer – Management –

Part 2: Multiple device control management

Transfert de puissance sans fil – Gestion –

Partie 2: Gestion du contrôle de dispositifs multiples

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.240.99; 33.160.99; 35.100.01 ISBN 978-2-8322-9452-9

– 2 – IEC 62827-2:2017 © IEC 2017

CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 9
3.1 Definitions. 9
3.2 Abbreviated terms . 11
4 Overview . 11
5 Functionalities . 13
5.1 General . 13
5.2 Compatibility . 13
5.2.1 General . 13
5.2.2 Indirect control . 14
5.2.3 Direct control . 14
5.3 Initialization . 14
5.3.1 General . 14
5.3.2 Frequency band scan . 14
5.3.3 Initiation power transfer . 14
5.4 Association . 14
5.4.1 General . 14
5.4.2 Communication connection . 14
5.4.3 WPT eligibility check . 14
5.5 General charging management . 15
5.5.1 General . 15
5.5.2 Simultaneous WPT . 15
5.5.3 Sequential WPT . 15
5.5.4 Foaming WPT . 15
5.5.5 Compound WPT . 15
5.6 Abnormal status management . 15
5.6.1 General . 15
5.6.2 Source status detection . 16
5.6.3 Device status detection . 16
5.7 Inter–device WPT management . 16
5.8 Termination . 17
6 Protocols . 17
6.1 General . 17
6.2 ID structure . 17
6.2.1 Unique coupler ID . 17
6.2.2 Group ID . 18
6.2.3 Wireless Power management system ID . 18
6.2.4 Device ID . 18
6.3 Frame format . 18
6.3.1 General . 18
6.3.2 Frame header . 19
6.3.3 Frame body . 19

6.4 Frame type . 20
6.4.1 General . 20
6.4.2 Data frame . 20
6.4.3 Acknowledgement frame . 20
6.5 Payload format . 21
6.5.1 General . 21
6.5.2 Data frame . 21
6.6 Data block . 22
6.6.1 General . 22
6.6.2 Request block . 22
6.6.3 Response block . 24
6.6.4 Notification block . 25
7 Procedures . 27
7.1 General . 27
7.2 Association . 27
7.3 Group ID Set–up . 28
7.4 General WPT management . 28
7.4.1 Simultaneous WPT . 28
7.4.2 Sequential WPT . 29
7.4.3 Foaming WPT . 30
7.4.4 Compound WPT . 31
7.5 Abnormal situations management . 32
7.5.1 General . 32
7.5.2 Source status detection . 32
7.5.3 Device status detection . 33
7.6 Inter–device WPT management . 34
7.7 Termination . 35
Annex A (informative) Messages . 36
A.1 General . 36
A.2 API between application and APP block . 36
A.2.1 General . 36
A.2.2 ID display . 36
A.2.3 Power status display . 36
A.2.4 WPT mode selection display . 37
A.2.5 Scheduling information display . 38
A.2.6 Abnormal situations display . 39
A.3 Interface between MGMT and MGMT . 39
A.3.1 General . 39
A.3.2 WPMS–D identification . 40
A.3.3 WPT authentication . 40
A.3.4 Zone recognition . 42
A.3.5 WPT mode . 42
A.3.6 Scheduling information . 43
A.3.7 Abnormal situations management . 44
A.3.8 WPMS–D full charge notification . 44
A.3.9 WPT termination notification . 45
A.3.10 Inter–device WPT . 45
A.4 Interface between MGMT block and APP block . 46
A.4.1 General . 46

– 4 – IEC 62827-2:2017 © IEC 2017
A.4.2 Data request . 46
A.5 Interface between APP layer and MAC layer . 47
A.5.1 General . 47
A.5.2 MAC identification request . 48
A.6 Interface between MGMT block and Coupler Block . 48
A.6.1 General . 48
A.6.2 Scheduling control . 48
A.6.3 Current/voltage sensing . 49
A.6.4 Abnormal situation control . 49
A.6.5 WPT termination control . 50
A.6.6 Full charge . 50
A.6.7 Inter-device WPT . 51

Figure 1 – Usage examples of WPMS services . 12
Figure 2 – WPMS structure . 13
Figure 3 – Function of inter–device WPT management . 17
Figure 4 – UCID structure . 17
Figure 5 – Frame format . 19
Figure 6 – Data frame format . 20
Figure 7 – Acknowledgement frame format . 20
Figure 8 – Payload format of data frame . 21
Figure 9 – Block format of device status request . 23
Figure 10 – Block format of WPT request . 23
Figure 11 – Block format of coil control request . 23
Figure 12 – Block format of Group ID set–up request . 23
Figure 13 – Block format of inter–device WPT request . 24
Figure 14 – Block format of connection response . 24
Figure 15 – Block format of device status response . 24
Figure 16 – Block format of WPT response . 24
Figure 17 – Block format of coil control response . 25
Figure 18 – Block format of coil control response . 25
Figure 19 – Block format of inter–device WPT response . 25
Figure 20 – Block format of COM ID notification . 25
Figure 21 – Block format of WPT ID notification . 26
Figure 22 – Block format of WPT mode notification . 26
Figure 23 – Block format of WPT schedule notification . 26
Figure 24 – Block format of WPT termination request . 26
Figure 25 – Block format of full charge notification . 26
Figure 26 – Block format of discharge rate variation notification . 27
Figure 27 – Association . 27
Figure 28 – Group ID set–up . 28
Figure 29 – Simultaneous WPT . 29
Figure 30 – Sequential WPT . 30
Figure 31 – Foaming WPT . 31
Figure 32 – Compound WPT . 32

Figure 33 – Source status detection . 33
Figure 34 – Full charge detection . 34
Figure 35 – Discharge rate variation detection . 34
Figure 36 – Inter–device WPT . 35
Figure 37 – Termination . 35

Table 1 – Group ID . 18
Table 2 – ID structure . 18
Table 3 – Frame type value . 20
Table 4 – Data codes . 22
Table A.1 – Values for ID display . 36
Table A.2 – Values for power status display . 37
Table A.3 – Values for WPT mode selection display. 38
Table A.4 – Values for scheduling information display . 38
Table A.5 – Values for abnormal situation display . 39
Table A.6 – Values for WPMS–D identification . 40
Table A.7 – Values for WPT authentication . 41
Table A.8 – Values for WPMS–D power status information . 41
Table A.9 – Values for zone recognition . 42
Table A.10 – Values for WPT mode . 43
Table A.11 – Values for scheduling information . 43
Table A.12 – Values for abnormal situations management . 44
Table A.13 – Values for WPMS–D full charge notification . 45
Table A.14 – Values for WPT termination notification . 45
Table A.15 – Values for inter-device WPT . 46
Table A.16 – Values for data request . 47
Table A.17 – Values of MAC identification . 47
Table A.18 – Mac Type code. 48
Table A.19 – Values for scheduling control . 48
Table A.20 – Values for current/voltage sensing . 49
Table A.21 – Values for abnormal situation control . 50
Table A.22 – Values for WPT termination control . 50
Table A.23 – Value for full charge notification . 51
Table A.24 – Values for inter-device WPT . 51

– 6 – IEC 62827-2:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIRELESS POWER TRANSFER – MANAGEMENT –

Part 2: Multiple device control management

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62827-2 has been prepared by technical area 15: Wireless power
transfer, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
100/2900/FDIS 100/2939/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 8 – IEC 62827-2:2017 © IEC 2017
INTRODUCTION
The IEC 62827 (Wireless Power Transfer – Management) series provides the management
protocol for a wireless power transfer system in which power sources can deliver power to
receivers at a distance. The IEC 62827 series consists of the following parts:
• Part 1: Common components
• Part 2: Multiple device control management
• Part 3: Multiple source control management
Part 1 of IEC 62827 defines the definition and functionality for wireless power transfer
systems.
Part 2 of IEC 62827 specifies the management protocol of wireless power transfer for multiple
devices.
Part 3 of IEC 62827 specifies the management protocol of wireless power transfer for multiple
sources.
WIRELESS POWER TRANSFER – MANAGEMENT –

Part 2: Multiple device control management

1 Scope
This part of IEC 62827 defines a wireless power management protocol for wireless power
transfer to multiple devices in a wireless power management system. Various functions of
wireless power management systems are justified. The wireless power management frames
and messages that work between the management block of a power source and the
management block or the coupler block of a device, or the coupler block of a power source,
are defined as well to execute various functions. Also, the procedures for each functionality
are described based on its frames and messages.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 62827-1, Wireless power transfer – Management – Part 1: Common components
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms and definitions given in IEC 62827-1 and the
following 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 Definitions
3.1.1
COM ID
ID which is allocated to power a receiver within the wireless data communication zone of the
wireless power source
3.1.2
wireless data communication zone
area where a wireless power source can transfer data to wireless power receivers without
physical contact
3.1.3
wireless power management frame
format of the data which is exchanged between a wireless power source and a wireless power
receiver
– 10 – IEC 62827-2:2017 © IEC 2017
3.1.4
wireless power management message
data which is exchanged between a wireless power source and a wireless power receiver
3.1.5
wireless power management protocol
set of rules which determines how a wireless power source communicates with wireless power
receivers in the wireless power management system
3.1.6
wireless power management system
management system that is capable of transferring electric power from either one or multiple
wireless power source(s) to either one or multiple wireless power device(s) with wireless
communication
Note 1 to entry: In the event that areas or regions, where both data and power can be transferred, are
emphasized, the term “Wireless Power Transfer Network” may be used.
3.1.7
wireless power management system
wireless power receiver that can receive electric power from wireless power sources
3.1.8
wireless power management system
wireless power relay transmitter that can transfer electric power from one or
multiple wireless power source(s) to one or multiple wireless power receiver(s)
3.1.9
wireless power management system
wireless power source that can transfer electric power to a number of wireless
power receivers or relay transmitters
3.1.10
wireless power receiver
device that receives electric power wirelessly
3.1.11
wireless power source
transmitter that delivers electric power to power receiver
3.1.12
wireless power transfer
transfer of electric power without the physical contact of electrodes
3.1.13
wireless power transfer system
system that wirelessly transfers electric power from a wireless power source to a wireless
power receiver
3.1.14
wireless power transfer zone
area where a wireless power source can transfer electric power to wireless power receivers
without physical contact
3.1.15
WPT ID
ID which is allocated to the device within the wireless power transfer zone of wireless power
source
3.2 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply:
ABNR abnormal
API application programming interface
APP application
DMTC device management to coupler
DST destination
ELGB eligibility
MAC medium access control
MFAN magnetic field area network
MGMT management
MTM MGMT to MGMT
NFC near field communication
PHY physical
RFID radio frequency identification
RSSI received signal strength indicator
RX receiving
RxPower received power
SCHDL scheduling
SMTA source management to application
SRC source
UCID unique coupler ID
WDCZ wireless data communication zone
WPMS wireless power management system
WPMS–D wireless power management system – device
WPMS ID wireless power management system identification
WPMS–R wireless power management system – repeater
WPMS–S wireless power management system – source
WPT wireless power transfer
WPTS wireless power transfer system
WPTZ wireless power transfer zone
4 Overview
WPMS, which is defined in IEC 62827-1, is a management protocol system for wireless power
transfer to a number of WPMS–Ds. WPT is a technology that replaces the conventional wired
charging method with wireless charging. It utilizes the characteristics of magnetic fields and
electric fields to deliver power wirelessly. In the market, there are a large number of wireless
charging devices, designed under various kinds of protocols, which are not interoperable. The
inconvenience it causes to users could cost an unnecessary large sum of money, and
uneconomical expenditure. WPMS aims to provide consumers of wireless charging devices an
option to be able to fully utilize a system that is compatible with a number of existing
technologies. Also, to break away from conventional 1:1 wireless charging (1:1 WPT), WPMS
will be managing power transfer to multiple WPMS–Ds at a time (1:N WPT), using various
WPT modes.
– 12 – IEC 62827-2:2017 © IEC 2017

IEC
Figure 1 – Usage examples of WPMS services
The WPMS technology can be applied to the following industry fields, and others that require
a constant power supply. WPMS services can be provided as shown in Figure 1:
• mobile terminals: charging services can be provided within mobile terminals anytime and
anywhere;
• Hhome appliances: to make entangled cable mess neat and convenient, the use of WPMS
technology can offer the benefits of minimal wiring and freedom of furniture arrangement.
In order to provide effective WPT to multiple WPMS–Ds, a proper management protocol shall
be thoroughly structured as shown in Figure 2. This protocol enables WPMS–S or WPMS–R
to control WPMS–Ds for efficient WPT process, regardless of MAC and PHY types. Under the
structure of WPMS, it will be able to incorporate both out-band WPT systems, which use Wi-Fi,
Bluetooth, ZigBee, NFC, RFID etc., and in-band WPT systems, which use MFAN etc. The
WPMS can exchange the messages between such blocks as APP block, MGMT block and
coupler block. See Annex A for additional information. It shall have the system structure
shown in Figure 2.
WPMS-S Tunneling WPMS-D
APP block APP block
APP APP
MAC MAC
MGMT MGMT
Layer Layer
PHY PHY
Coupler Coupler
Coupler Coupler
block block
Out of
Scope
IEC
Figure 2 – WPMS structure
In order to efficiently provide WPT services to multiple WPMS–Ds, a proper signalling system
is required; it shall be incorporated for the exchange of WPT data and control signals. For the
compatibility of the WPT, users may select various frequency bands for the WPT as well.
Within the WPMS's range, WPMS–Ss or WPMS–Rs can provide WPTs with several watts to
several hundred watts. The closer the distance between WPMS–Ss and WPMS–Ds, the
greater the efficiency becomes. As shown in Figure 1, provided that enough infrastructure is
installed, an omnipresent charging environment is created.
Functions like optimal WPT mode selection are included for the best WPT efficiency. Also, the
WPMS includes emergency controls that provide counter-measures to contingencies, such as
sudden WPMS–D detection and disappearance. General WPT environments are controlled by
WPMS–Ss, which manage connection, separation, and release of WPMS–Ds. In order to
increase the efficiency of WPMS, WPTS can use in band communication which utilizes the
frequency to transfer data as well as power.
5 Functionalities
5.1 General
In order to design a management protocol that can construct reliable and efficient WPTS for
multiple WPMS–Ds, it needs to include all the fundamental functions, yet not repetitively. In
WPMSs, there are two ways of controlling compatibility: indirect control and direct control.
Also, functions are categorized into six distinctive functions. They are initialization,
association, general WPT management, abnormal WPT management, inter–device WPT
management, and termination.
5.2 Compatibility
5.2.1 General
There are two ways of control, depending on the compatibility with WPTS and WPMS. If
WPTS does not support WPMS, WPMS will control indirectly; otherwise, it will control directly.

– 14 – IEC 62827-2:2017 © IEC 2017
5.2.2 Indirect control
Under indirect control, a WPMS-S detects nearby a WPMS-D through a frequency scan. Once
detected, a WPMS-S will at least acknowledge the number and type of WPMS-Ds within its
range. WPMS-S will manage WPMS-Ds only as they are defined in each WPTS specification.
5.2.3 Direct control
If WPMS application is compatible with WPTS, direct control can be used. In this case, the
application can communicate with WPTS to receive various pieces of information from it. As a
consequence, a WPMS-S can manage the entire WPMS more effectively. In order to fully
utilize direct control, there shall be appropriate adjustments to each WPTS specification.
5.3 Initialization
5.3.1 General
Before a WPMS-S can initiate a WPT service to multiple WPMS–Ds, establishing
communication with WPMS-Ds should precede.
5.3.2 Frequency band scan
To identify WPMS-Ds within the WPTZ, the WPMS-S periodically broadcasts connection
requests to match with all WPMS-Ds of diverse frequency bands. The broadcasting is
processed in in-band and out-band scans in order to support diverse types of WPMS-Ds.
5.3.3 Initiation power transfer
When there is not a single WPMS-D detected from the frequency band scan, the WPMS-S
considers the possibility of a powered down WPMS-D. To wake up powered down WPMS-Ds
if there are any, the WPMS-S periodically transfers initiation power in several frequencies,
when there is no WPMS-D associated to the WPMS-S. When there are WPMS-Ds in the
WPMS that is currently receiving the WPT, the ongoing WPT may wake up powered down
WPMS-Ds.
5.4 Association
5.4.1 General
Once WPMS-Ds have been initiated, they need to be associated by WPMS-S to be properly
scheduled for efficient WPT.
5.4.2 Communication connection
Once WPMS–Ds are detected from frequency band scans, the WPMS–S sends connection
requests to WPMS–Ds. WPMS–Ds that have received a connection request will reply back to
WPMS–S with their addresses. The WPMS–S will check on the received device address, and
register the address. Accordingly, the WPMS–S will allocate a COM ID to each WPMS–D.
5.4.3 WPT eligibility check
As a WPMS–D is connected to the WPMS–S and allocated a COM ID, the WPMS–S will
request it’s the device status of the WPMS–D – frequency, battery information, received
signal strength, and so on. The WPMS–D will return information in response data. With the
data, the WPMS–S calculates eligibility with various factors, such as the distance to WPMS–
Ds. Consequently, the WPMS–S will inform the WPMS–Ds whether they are eligible for WPT
or not. According to the result of the eligibility check, the final candidate for WPT service will
be determined, and receive WPT ID.
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