IEC TS 61980-2:2019

Electric vehicle wireless power transfer (WPT) systems - Part 2: Specific requirements for communication between electric road vehicle (EV) and infrastructure

IEC TS 61980-2:2019 applies to communication between electric road vehicle (EV) and wireless power transfer (WPT) systems when connected to the supply network, at standard supply voltages per IEC 60038 up to 1000 V AC and up to 1500 V DC.
This document also applies to wireless power transfer equipment supplied from on-site storage systems (e.g. buffer batteries) at standard supply voltages per IEC 60038 up to 1000 V AC and up to 1500 V DC.
The aspects covered in this document include
– standards for operational characteristics and functional characteristics of the WPT communication subsystem,
– communication requirements for WPT system while driving, which are under consideration,
– communication requirements for two- and three-wheel vehicles, which are under consideration, and
– communication requirements for bidirectional power transfer are under consideration
This document does not apply to
– safety aspects related to maintenance, and
– trolley buses, rail vehicles and vehicles designed primarily for use off-road.

General Information

• Status: Replaced
• Publication Date: 12-Jun-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 43.120 - Electric road vehicles
• Technical Committee: TC 69 - Electrical power/energy transfer systems for electrically propelled road vehicles and industrial trucks
• Drafting Committee: WG 7 - TC 69/WG 7
• Current Stage: DELPUB - Deleted Publication
• Start Date: 03-May-2023
• Completion Date: 22-Nov-2019

Relations

• Revised: IEC 61980-2:2023 - Electric vehicle wireless power transfer (WPT) systems - Part 2: Specific requirements for MF-WPT system communication and activities
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TS 61980-2 ®
Edition 1.0 2019-06
TECHNICAL
SPECIFICATION
colour
inside
Electric vehicle wireless power transfer (WPT) systems –
Part 2: Specific requirements for communication between electric road vehicle
(EV) and infrastructure
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IEC TS 61980-2 ®
Edition 1.0 2019-06
TECHNICAL
SPECIFICATION
colour
inside
Electric vehicle wireless power transfer (WPT) systems –

Part 2: Specific requirements for communication between electric road vehicle

(EV) and infrastructure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 43.120 ISBN 978-2-8322-6679-3

– 2 – IEC TS 61980-2:2019  IEC 2019
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
4 Abbreviated terms . 14
5 Communication of WPT systems . 14
5.1 General . 14
5.2 System architecture . 14
5.3 General system requirements . 16
5.3.1 General . 16
5.3.2 Interoperability requirements . 16
5.3.3 System configuration . 16
5.3.4 Communication security . 17
5.3.5 Timing . 17
6 Power transfer process with respect to communication . 17
6.1 General . 17
6.2 Overview of operation process activities . 17
6.3 Activities . 18
6.3.1 Communication setup and service selection . 18
6.3.2 Reject WPT session . 18
6.3.3 Fine positioning . 18
6.3.4 Pairing . 19
6.3.5 Final compatibility check . 19
6.3.6 Initial alignment check . 20
6.3.7 Prepare power transfer . 20
6.3.8 Time scheduled power transfer (informative) . 21
6.3.9 Perform power transfer . 22
6.3.10 Stop power transfer . 23
6.3.11 WPT session . 24
6.3.12 EV leaves WPT spot . 24
6.3.13 Safety monitoring and diagnostics . 24
6.3.14 Terminate communication . 25
6.3.15 Terminate safety monitoring and diagnostics . 25
6.3.16 Wake-up after power outage . 25
7 Control process states . 26
7.1 Supply device state definitions . 26
7.1.1 Supply device state diagram . 26
7.1.2 Stand by (WPT_S_SB) . 27
7.1.3 Service initiated (WPT_S_SI) . 27
7.1.4 WPT session rejected . 28
7.1.5 Awaiting alignment (WPT_S_AA) . 29
7.1.6 Idle (WPT_S_IDLE) . 31
7.1.7 Power transfer (WPT_S_PT) . 32
7.1.8 Service terminated occupied (WPT_S_STO) . 33
7.1.9 Out of service (WPT_S_OOS) . 34

7.1.10 Sleep mode WPT_S_SLP . 34
7.2 Supply device state transitions . 35
7.3 EV device state definitions . 36
7.3.1 EV device state diagram . 36
7.3.2 Stand by (WPT_V_SB) . 37
7.3.3 Service initiated (WPT_V_SI) . 38
7.3.4 Awaiting alignment (WPT_V_AA) . 39
7.3.5 Idle (WPT_V_IDLE) . 40
7.3.6 Power transfer active (WPT_V_PT) . 40
7.3.7 Off (WPT_V_OFF) . 40
7.4 EV state transitions . 40
7.5 Exception handling. 41
7.5.1 General . 41
7.5.2 Supply device exception handling (WPT_S_ERR) . 41
7.5.3 EV device exception handling (WPT_V_ERR) . 41
7.5.4 Exception descriptions . 42
8 Communication parameter for WPT systems . 42
8.1 General . 42
8.2 General parameters . 42
8.3 Communication setup . 42
8.4 Service selection . 43
8.5 Fine positioning . 45
8.5.1 General . 45
8.5.2 Starting fine positioning . 45
8.5.3 Fine positioning data exchange . 45
8.5.4 Terminating fine positioning . 46
8.6 Pairing . 46
8.6.1 General . 46
8.6.2 Start pairing . 46
8.7 Initial alignment check . 47
8.7.1 General . 47
8.7.2 Initial alignment check request/response . 47
8.8 Prepare power transfer . 48
8.8.1 General . 48
8.8.2 Final compatibility check . 48
8.9 Perform power transfer . 49
8.10 Stop power transfer . 50
8.11 Terminate communication . 50
8.12 Exception handling. 50
9 Message sequences of communication with WLAN . 51
9.1 General . 51
9.2 Messages of communication for power transfer . 51
9.3 Communication setup . 51
9.4 Service selection . 51
9.5 Fine positioning . 52
9.6 Pairing . 52
9.7 Final compatibility check . 52
9.8 Initial alignment check . 52
9.9 Prepare power transfer . 53

– 4 – IEC TS 61980-2:2019  IEC 2019
9.10 Perform power transfer . 53
9.11 Stop power transfer . 54
9.12 Terminate communication . 54
Annex A (informative)  Use cases . 55
A.1 General . 55
A.2 Use case descriptions . 57
A.2.1 UC select supply device . 57
A.2.2 UC service selection . 59
A.2.3 UC fine positioning . 60
A.2.4 UC prepare power transfer . 62
A.2.5 UC safety monitoring and diagnostics . 64
A.2.6 UC perform power transfer . 64
A.2.7 UC stop power transfer . 65
A.2.8 UC sleep mode (optional) . 67
Annex B (informative) Physical definition of links and signals. 69
B.1 General . 69
B.2 System architecture . 69
B.3 WLAN . 69
B.4 SR signal . 69
B.5 LF signal (EV device to supply device) . 70
B.6 Magnetic vector (EV device to supply device) . 72
B.7 LPE (supply device to EV device) . 72
Annex C (informative) Usage of supplemental signals . 73
C.1 General . 73
C.2 Fine positioning . 73
C.2.1 General . 73
C.2.2 Manual . 73
C.2.3 Low power excitation (LPE) . 73
C.2.4 LF signal . 74
C.2.5 Magnetic vector . 77
C.3 Pairing . 77
C.3.1 General . 77
C.3.2 Coding pattern specification. 77
C.3.3 Low power excitation (LPE) . 78
C.3.4 SR signal . 79
C.3.5 LF signal . 79
C.3.6 Magnetic vector . 79
C.4 Initial alignment check . 80
C.4.1 General . 80
C.4.2 LPE target current check . 80
C.4.3 RSSI method . 81
C.5 Continuous alignment check . 82
C.5.1 General . 82
C.5.2 System anomaly check . 82
C.5.3 SR signal . 83
C.6 Emergency shutdown . 83
C.6.1 General . 83
C.6.2 RF signal . 83
C.6.3 Power termination . 83

Bibliography . 84

Figure 1 – Possible elements of combination in a communication subsystem . 15
Figure 2 – WPT site with a single supply device . 16
Figure 3 – Operation process of activities for the WPT . 17
Figure 4 – Supply device state diagram . 26
Figure 5 – Activity communication setup . 27
Figure 6 – Activity service selection . 28
Figure 7 – Activity reject WPT session . 29
Figure 8 – Activity from fine positioning to initial alignment check . 30
Figure 9 – Activity prepare power transfer . 31
Figure 10 – Activity terminate WPT session . 32
Figure 11 – Activity Sleep . 32
Figure 12 – Activity stop power transfer . 33
Figure 13 – Activity EV leave WPT spot . 34
Figure 14 – Activity wake-up . 35
Figure 15 – EV device state diagram . 37
Figure 16 – Activity communication setup (EV device state) . 38
Figure 17 – Activity service selection (EV device state) . 38
Figure 18 – Activity from fine positioning to initial alignment check (EV device state) . 39
Figure 19 – Activity prepare power transfer (EV device state) . 40
Figure A.1 – Use cases particularly for wireless power transfer . 55
Figure A.2 – Use cases from ISO 15118-1 reusable for WPT systems. 56
Figure A.3 – Activity diagram for UC select supply device . 58
Figure A.4 – Activity diagram for UC fine positioning . 61
Figure A.5 – Activity diagram for UC prepare power transfer . 63
Figure A.6 – Activity diagram for UC perform power transfer . 65
Figure A.7 – Activity diagram for UC stop power transfer . 66
Figure A.8 – Activity diagram for UC sleep mode . 68
Figure B.1 – Example arrangement of the auxiliary LF antennas for the primary device
(left) and the vehicle (right) . 71
Figure B.2 – Example arrangement of the auxiliary LF antennas for the primary device
(left) and the EV (right) . 72
Figure C.1 – Explanation of parameters for LF fine positioning . 76
Figure C.2 – Coding pattern timing and examples . 78
Figure C.3 – Symmetrical antenna configuration for signal comparison with zero offset . 81
Figure C.4 – Symmetrical antenna configuration for signal comparison with given offset . 82

Table 1 – Supply device state transitions . 35
Table 2 – EV device state transitions . 41
Table 3 – Exception handling . 42
Table 4 – Service selection EVCC request parameters . 43
Table 5 – Service selection SECC response parameters . 43
Table 6 – Method list for fine positioning . 44

– 6 – IEC TS 61980-2:2019  IEC 2019
Table 7 – Method list for pairing . 45
Table 8 – Method list for initial alignment . 45
Table 9 – Fine positioning response . 45
Table 10 – Pairing start request . 46
Table 11 – Pairing start response . 46
Table 12 – Pairing confirmation request . 47
Table 13 – Pairing confirmation response . 47
Table 14 – Initial alignment check request . 47
Table 15 – Initial alignment check response . 47
Table 16 – Final compatibility check request parameters . 48
Table 17 – Final compatibility check response parameters . 48
Table 18 – Perform power transfer request parameters . 49
Table 19 – Perform power transfer response parameters . 49
Table 20 – Error request parameters . 50
Table 21 – Error respond parameters . 50
Table A.1 – UC select supply device . 57
Table A.2 – UC service selection . 59
Table A.3 – UC fine positioning . 60
Table A.4 – UC prepare power transfer . 62
Table A.5 – UC safety monitoring and diagnostics . 64
Table A.6 – UC perform power transfer . 64
Table A.7 – UC stop power transfer . 65
Table A.8 – UC sleep mode . 67
Table C.1 – Data of the antenna arrangement at EV to send to SECC . 74
Table C.2 – Data of the antenna arrangement at primary device to send to EVCC . 75
Table C.3 – Data exchanged between EVCC and SECC during fine positioning . 76

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC VEHICLE WIRELESS POWER TRANSFER (WPT) SYSTEMS –

Part 2: Specific requirements for communication between electric road
vehicle (EV) and infrastructure

FOREWORD
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC TS 61980-2, which is a Technical Specification, has been prepared by IEC technical
committee TC 69: Electric road vehicles and electric industrial trucks.
The text of this Technical Specification is based on the following documents:

– 8 – IEC TS 61980-2:2019  IEC 2019
Draft TS Report on voting
69/529/DTS 69/585B/RVDTS
Full information on the voting for the approval of this Technical Specification can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO Directives, Part 2.
In this Technical Specification, the following print types are used:
• conformity statements: in italic type;
• states and messages: bold type.
A list of all parts of the IEC 61980 series, published under the general title Electric vehicle
wireless power transfer (WPT) systems, can be found on the IEC website.
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.

INTRODUCTION
The IEC 61980 series is published in separate parts according to the following structure:
– IEC 61980-1 covers general requirements for electric road vehicle (EV) wireless power
transfer (WPT) systems including general background and definitions. (e.g. efficiency,
electrical safety, EMC);
– IEC TS 61980-2 covers specific requirements for communication between electric road
vehicle (EV) and wireless power transfer (WPT) systems including general background
and definitions;
– IEC TS 61980-3 covers specific requirements for electric road vehicle (EV) magnetic field
wireless power transfer (MF-WPT) systems including general background and definitions
(e.g. efficiency, electrical safety, EMC).
The requirements described in IEC 61980-1 are general. The technical requirements for the
various wireless power transfer (WPT) technologies are very different; they are specified in
the technology specific parts of the IEC 61980 series. A list of possible WPT technologies is
listed in IEC 61980-1. The requirements for magnetic field-wireless power transfer systems
(MF-WPT) are described in IEC TS 61980-3. Further parts of the IEC 61980 series will
describe other technologies such as power transfer via electric field or via electromagnetic
field wireless power transfer systems (EF-WPT) or electromagnetic field-WPT systems, also
named microwave-WPT systems (MW-WPT).
Reference to "technology specific parts" always refers to each parts of the IEC 61980 series.
The structure of the "technology specific parts" follows the structure of IEC 61980-1.
WPT systems are still under development. For this reason, there is the future but not
immediate possibility of an agreement to publish an International Standard. The committee
has decided, by following the procedure set out in ISO/IEC Directives, Part 1:2018, 2.3, that
the publication of a Technical Specification is appropriate. The reasons for publishing the
Technical Specification is a high market need for a first basic technical description.
IEC TS 61980-2, also published as a Technical Specification for the same reasons as
IEC TS 61980-3, deals with communication and for this reason has an independent structure.
The numbering of the clauses does not follow the numbering of the other parts of the
IEC 61980 series.
The electric road vehicles (EV) requirements of the MF-WPT system are covered by
ISO/PAS 19363.
– 10 – IEC TS 61980-2:2019  IEC 2019
ELECTRIC VEHICLE WIRELESS POWER TRANSFER (WPT) SYSTEMS –

Part 2: Specific requirements for communication between electric road
vehicle (EV) and infrastructure

1 Scope
This Part of IEC 61980, which is a Technical Specification, applies to communication between
electric road vehicle (EV) and wireless power transfer (WPT) systems when connected to the
supply network, at standard supply voltages per IEC 60038 up to 1000 V AC and up to
1500 V DC.
This document also applies to wireless power transfer equipment supplied from on-site
storage systems (e.g. buffer batteries) at standard supply voltages per IEC 60038 up to
1000 V AC and up to 1500 V DC.
The aspects covered in this document include
– standards for operational characteristics and functional characteristics of the WPT
communication subsystem,
– communication requirements for WPT system while driving, which are under consideration,
– communication requirements for two- and three-wheel vehicles, which are under
consideration, and
– communication requirements for bidirectional power transfer are under consideration
This document does not apply to
– safety aspects related to maintenance, and
– trolley buses, rail vehicles and vehicles designed primarily for use off-road.
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 61980-1, Electric vehicle wireless power transfer (WPT) systems – Part 1: General
requirements
IEC TS 61980-3:2019, Electric vehicle wireless power transfer (WPT) systems – Part 3
Specific requirements for the magnetic field wireless power transfer systems
ISO 15118 (all parts), Road vehicles – Vehicle to grid communication interface
ISO 15118-2, Road vehicles – Vehicle to grid communication interface – Part 2: Network and
application protocol requirements
—————————
Second edition under preparation. Stage at the time of publication: ISO/DIS 15118-2:2019.

ISO 15118-8:2018, Road vehicles – Vehicle to grid communication interface – Part 8: Physical
layer and data link layer requirements for wireless communication
ISO 15118-20, Road vehicles – Vehicle to grid communication interface – Part 20: 2nd
generation network and application protocol requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61980-1 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
alignment
relative position in x and y direction of the secondary device to the primary device
3.2
centre alignment point
geometrical centre of the alignment tolerance area
Note 1 to entry: The centre alignment point is always relative to the primary and secondary device combination
and is dependent upon magnetic characteristics.
3.3
electric vehicle communication controller
EVCC
on-board component which implements the communication with the SECC
3.4
EV device
on-board component assembly, comprising the secondary device, the EV power electronics
and all on-board communication controllers, as well as the electrical and mechanical
connections between the assemblies
Note 1 to entry: Ancillary systems used for supporting the operation of MF-WPT are also included (e.g.
positioning).
Note 2 to entry: The hardware packaging of the assemblies is up to the discretion of the manufacturer.
3.5
EV device P2PS controller
on-board equipment that controls the EV device's P2PS
3.6
EV power circuit
EVPC
on-board component assembly, comprising the secondary device and EV power electronics,
as well as the electrical and mechanical connections
Note 1 to entry: EVPC is here defined specifically for MF-WPT systems.
—————————
Under preparation. Stage at the time of publication: ISO/DIS 15118-20:2019.

– 12 – IEC TS 61980-2:2019  IEC 2019
3.7
EV signal
P2PS from EV device
3.8
foreign object
object that is not an attached part of the vehicle or the MF-WPT system
3.9
low power excitation
LPE
energizing of the primary device as a P2PS
3.10
MF-WPT system
system comprising the supply device and the EV device to perform MF-WPT
3.11
natural offset
vector from the centre of the primary device to the centre alignment point of the secondary
device in x and y direction
3.12
open systems interconnection
OSI
reference model developed by ISO to enable different or similar systems to dialogue with one
another
Note 1 to entry: This model constitutes a reference framework for describing data exchanges. Each layer
performs a service at the request of the adjacent higher layer, and in turn, requests more basic services from the
lower layers. It is described in 7 layers.
Note 2 to entry: Open systems interconnection (OSI) is an international effort to facilitate communications among
computers of different manufacture and technology.
[SOURCE: ISO 15784-3:2008, 3.17]
3.13
point to point signal
P2PS
unidirectional wireless link between EV device and supply device
3.14
primary device
off-board component that generates and shapes the magnetic field for power transfer
3.15
rechargeable energy storage system
RESS
rechargeable system that stores energy for delivery of electric energy for the electric drive
EXAMPLE Battery, capacitor, flywheel.
[SOURCE: ISO 6469-1:2009, 3.16, modified – The definition has been rephrased, and the
term "flywheel" has been added to the example.]
3.16
secondary device
on-board component that captures the magnetic field

3.17
secondary device ground clearance
vertical distance between the ground surface and the lowest point of the secondary device
including the housing
Note 1 to entry: The lower surface does not need to be planar or parallel to the ground surface.
3.18
SR signal
EV signal with a short range that is intended to be received by only one supply device
3.19
supply device
off-board component assembly, comprising the primary device, the supply power electronics,
and all off-board communication controllers, as well as the electrical and mechanical
connections between the assemblies
Note 1 to entry: Ancillary systems used for supporting the operation of MF-WPT are also included (e.g. LOP,
FOD, positioning).
Note 2 to entry: The hardware packaging of the assemblies is up to the discretion of the manufacturer.
3.20
supply device P2PS controller
off-board equipment that controls the supply device's P2PS
3.21
supply equipment
off-board equipment comprising the SECC and one or multiple supply devices working under
the control of the same SECC
3.22
supply equipment communication controller
SECC
off-board component that implements the communication with the EVCC(s)
Note 1 to entry: One SECC can control multiple supply devices for
...