IEC TS 61980-3:2019

IEC TS 61980-3 ®
Edition 1.0 2019-06
TECHNICAL
SPECIFICATION
colour
inside
Electric vehicle wireless power transfer (WPT) systems –
Part 3: Specific requirements for the magnetic field wireless power transfer
systems
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IEC TS 61980-3 ®
Edition 1.0 2019-06
TECHNICAL
SPECIFICATION
colour
inside
Electric vehicle wireless power transfer (WPT) systems –

Part 3: Specific requirements for the magnetic field wireless power transfer

systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 43.120 ISBN 978-2-8322-6675-5

– 2 – IEC TS 61980-3:2019  IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviations . 13
4 Symbols and abbreviated terms . 13
5 General . 13
6 Classification . 13
7 Interoperability . 15
7 System infrastructure requirements . 15
8 General systems requirements . 24
9 Communication . 24
10 Protection against electric shock . 24
11 Specific requirements for WPT systems . 25
12 Power cable assembly requirements . 26
13 Constructional requirements . 27
14 Strength of materials and parts . 27
15 Service and test conditions . 28
16 Electromagnetic compatibility (EMC) . 28
17 Marking and instructions . 28
101 Test procedure . 28
Annex AA (informative) DD reference EV power circuit (EVPC) for MF-WPT1, MF-
WPT2 and MF-WPT3 . 37
Annex BB (informative) Circular reference EV power circuit (EVPC) for MF-WPT1,
MF-WPT2 and MF-WPT3 . 54
Annex CC (informative) Heavy-duty magnetic field WPT . 73
Annex DD (informative) Coil position in parking spot . 79
Annex EE (informative) Description for system interoperability . 80
Bibliography . 107

Figure 101 – Flush mounted . 11
Figure 102 – Surface mounted . 12
Figure 103 – Components of an MF-WPT system . 16
Figure 104 – Control loop of WPT system . 21
Figure 105 – Illustration of test positions . 30
Figure AA.1 – Mechanical dimensions of the MF-WPT1/Z1 DD reference secondary
device . 38
Figure AA.2 – Schematic of the EV power electronics for the MF-WPT1/Z1 DD
reference EVPC . 39
Figure AA.3 – Mechanical dimensions of the MF-WPT1/Z2 DD reference secondary
device . 40

Figure AA.4 – Schematic of the EV power electronics for the MF-WPT1/Z2 DD
reference EVPC . 41
Figure AA.5 – Mechanical dimensions of the MF-WPT2/Z1 DD reference secondary

device . 42
Figure AA.6 – Schematic of the EV power electronics for the MF-WPT2/Z1 DD
reference EVPC . 43
Figure AA.7 – Mechanical dimensions of the MF-WPT2/Z2 DD reference secondary
device . 44
Figure AA.8 – Schematic of the EV power electronics for the MF-WPT2/Z2 DD

reference EVPC . 45
Figure AA.9 – Mechanical dimensions of the MF-WPT2/Z3 DD reference secondary
device . 46
Figure AA.10 – Schematic of the EV power electronics for the MF-WPT2/Z3 DD
reference EVPC . 47
Figure AA.11 – Mechanical dimensions of the MF-WPT3/Z1 DD reference secondary

device . 48
Figure AA.12 – Schematic of the EV power electronics for the MF-WPT3/Z1 DD
reference EVPC . 49
Figure AA.13 – Mechanical dimensions of the MF-WPT3/Z2 DD reference secondary
device . 50
Figure AA.14 – Schematic of the EV power electronics for the MF-WPT3/Z2 DD

reference EVPC . 51
Figure AA.15 – Mechanical dimensions of the MF-WPT3/Z3 DD reference secondary
device . 52
Figure AA.16 – Schematic of the EV power electronics for the MF-WPT3/Z3 DD
reference EVPC . 53
Figure BB.1 – Mechanical dimensions of the MF-WPT1/Z1 circular reference
secondary device . 55
Figure BB.2 – Schematic of the EV power electronics for the MF-WPT1/Z1 circular
reference EVPC . 56
Figure BB.3 – Mechanical dimensions of the MF-WPT1/Z2 circular reference
secondary device . 57
Figure BB.4– Schematic of the EV power electronics for the MF-WPT1/Z2 circular
reference EVPC . 58
Figure BB.5 – Mechanical dimensions of the MF-WPT1/Z3 circular reference
secondary device . 59
Figure BB.6 – Schematic of the EV power electronics for the MF-WPT1/Z3 circular
reference EVPC . 59
Figure BB.7 – Mechanical dimensions of the MF-WPT2/Z1 circular reference secondary
device . 61
Figure BB.8 – Schematic of the EV power electronics for the MF-WPT2/Z1 circular
reference EVPC . 62
Figure BB.9 – Mechanical dimensions of the MF-WPT2/Z2 circular reference secondary
device . 63
Figure BB.10 – Schematic of the EV power electronics for the MF-WPT2/Z2 circular
reference EVPC . 64
Figure BB.11– Mechanical dimensions of the MF-WPT2/Z3 circular reference
secondary device . 65
Figure BB.12 – Schematic of the EV power electronics for the MF-WPT2/Z3 circular
reference EVPC . 66

– 4 – IEC TS 61980-3:2019  IEC 2019
Figure BB.13 – Mechanical dimensions of the MF-WPT3/Z1 circular reference
secondary device . 67
Figure BB.14 – Schematic of the EV power electronics for the MF-WPT3/Z1 circular
reference EVPC . 68
Figure BB.15 – Mechanical dimensions of the MF-WPT3/Z2 circular reference
secondary device . 69
Figure BB.16 – Schematic of the EV power electronics for the MF-WPT2/Z2 circular
reference EVPC . 70
Figure BB.17 – Mechanical dimensions of the MF-WPT3/Z3 circular reference
secondary device . 71
Figure BB.18– Schematic of the EV power electronics for the MF-WPT3/Z3 circular
reference EVPC . 72
Figure CC.1 – Mechanical dimensions of the MF-WPT5 heavy-duty WPT reference
primary device . 75
Figure CC.2 – Schematic of supply power electronics for the heavy-duty WPT
reference primary device . 76
Figure CC.3 – Mechanical dimensions of the MF-WPT5 heavy-duty WPT reference
secondary device . 77
Figure CC.4 – Schematic of the EV power electronics for the MF-WPT5 heavy-duty
WPT secondary reference device . 78
Figure DD.1 – Coil position in parking spot . 79
Figure EE.1 – General schematic of the concept showing the coil system and the ports
at which the parameters are defined . 81
Figure EE.2 – Example of GA impedance zone with stimulationi results for different
reference primary devices and secondary devices . 89
Figure EE.3 – Schematic to explain impedance . 91
Figure EE.4 – Behaviour of the reflected impedance . 92
Figure EE.5 – Position of measurement points . 95
Figure EE.6 – Coaxial gauge device . 97
Figure EE.7 – Transversal gauge device . 99
Figure EE.8 – Design of winding for the transversal gauge device . 100
Figure EE.9 – Exemplary test bench setup for secondary interoperability tests . 101
Figure EE.10 – Exemplary test bench setup for primary device interoperability tests . 103
Figure EE.11 – Test set-up for electric interoperability design testing . 105
Figure EE.12 –Test set-up for electric interoperability design testing . 105

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

Part 3: Specific requirements for the magnetic field wireless power
transfer systems
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
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 61980-3, which is a Technical Specification, has been prepared by IEC technical
committee 69: Electric road vehicles and electric industrial trucks.

– 6 – IEC TS 61980-3:2019  IEC 2019
The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
69/554A/DTS 69/616B/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/IEC Directives, Part 2.
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.
This part is to be used in conjunction with IEC 61980-1:2015.
The clauses of the particular requirements in this document supplement or modify the
corresponding clauses in IEC 61980-1:2015. Where the text indicates an "addition" to or a
"replacement" of the relevant requirement, test specification or explanation of
IEC 61980-1:2015, these changes are made to the relevant text of IEC 61980-1:2015, which
then becomes part of the standard. Where no change is necessary, the words "Clause xx of
IEC 61980-1:2015 is applicable" are used. Additional items to those of IEC 61980-1:2015 are
numbered starting 101. Additional annexes are lettered from AA onwards.
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 this document. Further parts of the IEC 61980 series will describe
other technologies such as power transfer via electric field (EF-WPT) 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 reason 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 reason 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.
– 8 – IEC TS 61980-3:2019  IEC 2019
ELECTRIC VEHICLE WIRELESS POWER TRANSFER (WPT) SYSTEMS –

Part 3: Specific requirements for the magnetic field wireless power
transfer systems
1 Scope
This part of IEC 61980, which is a Technical Specification, applies to the equipment for the
magnetic field wireless power transfer (MF-WPT) of electric power from the supply network to
electric road vehicles for purposes of supplying electric energy to the RESS (rechargeable
energy storage system) and/or other on-board electrical systems. The MF-WPT system
operates at standard supply voltages ratings per IEC 60038 up to 1 000 V AC and up to
1 500 V DC The power transfer takes place while the electric vehicle (EV) is stationary.
This document also applies to MF-WPT equipment supplied from on-site storage systems (e.g.
buffer batteries) at standard supply voltages ratings per IEC 60038 up to 1 000 V AC and up
to 1 500 V DC.
The aspects covered in this document include
– the characteristics and operating conditions,
– the required level of electrical safety,
– requirements for basic communication for safety and process matters if required by a MF-
WPT system,
– requirements for positioning to assure efficient and safe MF-WPT power transfer, and
– specific EMC requirements for MF-WPT systems.
The following aspects are under consideration for future documents:
– requirements for two- and three-wheel vehicles,
– requirements for MF-WPT systems supplying power to EVs in motion, and
– requirements for bidirectional power transfer.
This standard does not apply to
– safety aspects related to maintenance, and
– trolley buses, rail vehicles and vehicles designed primarily for use off-road.
NOTE The teRMS used in this document are specifically for MF-WPT.
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 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 61008-1, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules

IEC 61009-1, Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) – Part 1: General rules
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
with respect to wireless power transfer (WPT) systems
IEC 62423, Type F and type B residual current operated circuit-breakers with and without
integral overcurrent protection for household and similar uses
DIN 7405:1963, Wire staple 24/6 for office-staplers
EN 10130, Cold rolled low carbon steel flat products for cold forming – Technical delivery
conditions
ICNIRP Guidelines 1998, ICNIRP guidelines for limiting exposure to time-varying electric,
magnetic and electromagnetic fields (up to 300 GHz), International commission on non-
ionizing radiation protection, published in: Health Physics 74(4):494‐522; 1998
ICNIRP Guidelines 2010, ICNIRP guidelines for limiting exposure to time-varying electric and
magnetic fields (1 Hz – 100 kHz), International commission on non-ionizing radiation
protection, published in: Health Physics 99(6):818‐836; 2010
UL 2251, Standard for plugs, receptacles, and couplers for electric vehicles
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
Additional terms and definitions:
3.101
primary coil
component of the primary device according IEC 61980-1 comprising one or more electrical
windings generating a magnetic field for wireless power transfer (MF-WPT)
3.102
secondary coil
component of the secondary device according IEC 61980-1 comprising one or more electrical
windings generating a magnetic field for wireless power transfer (MF-WPT)
3.103
system frequency
frequency range over which the system is designed to transfer power
Note 1 to entry: The bandwidth is a frequency range above and below the nominal frequency, and need not be
centred at the nominal frequency. Spurious harmonics are not included in the bandwidth.

– 10 – IEC TS 61980-3:2019  IEC 2019
3.104
EV device
on-board component assembly, comprising the secondary device, the EV power electronics
and the on-board communication controller, as well as the mechanical connections between
the assemblies
3.105
complete power
power level which is the lower of the declared primary device input power according to the
specifications listed in 6.3, or of the output power limit specified by the manufacturer for the
EV device
3.106
primary device
off-board component that generates and shapes the magnetic field for power transfer
3.107
secondary device
on-board component that captures the magnetic field
3.108
secondary device ground clearance
vertical distance between the ground surface and the lowest point of the secondary device
Note 1 to entry: The lower surface may not be planar and may not be parallel to the ground surface.
3.109
plug and cable connected supply device
supply device that can be connected to, or disconnected from, the socket-outlet of AC or DC
supply network by the use of a plug
3.110
MF-WPT input power class
power class of a supply device of MF-WPT systems defined from the perspective of the
maximum power drawn from the supply network in order to drive the supply device
3.111
reference supply power circuit
supply power circuit that serves for conformance testing purposes
3.112
reference EVPC
on-board component which implements the communication with the SECC
3.113
EV communication controller
electrical vehicle communication controller
on-board component which implements the communication with the SECC
3.114
EV power circuit
EVPC
on-board component assembly that includes the secondary device and EV power electronics,
as well as the mechanical connections between the components
3.115
EV power electronics
on-board component, that converts the power and frequency needed for the output from the
EVPC
EXAMPLE Impedance matching network (IMN), filter, rectifier, impedance converter.
3.116
supply device
off-board component assembly comprising the primary device, the supply power electronics
and the supply device communication controller, as well as the mechanical connections
between the components necessary for wireless power transfer
3.117
supply power circuit
off-board component assembly comprising the supply power electronics and primary device,
as well as the mechanical connections between the components
3.118
supply equipment communication controller
SECC
off-board component that implements the communication with the EVCC(s)
3.119
supply power electronics
off-board electronics, including all housings and covers, that supply the electric power to the
primary device
EXAMPLE PFC converter, DC-AC inverter, filter, impedance matching network.
3.120
MF-WPT system
system comprising the supply device and the EV device to perform MF-WPT
Note 1 to entry: See also Figure 303.
3.121
flush mounted
mounting of a primary device in such a manner that the top of the covering primary device is
flush with the road surface
SEE Figure 101.
Key
a primary device
b secondary device
1 operational air gap
2 mechanical air gap
3 covering primary device
4 covering secondary device
5 top of road surface
6 secondary device ground clearance
Figure 101 – Flush mounted
– 12 – IEC TS 61980-3:2019  IEC 2019
3.122
surface mounted
mounting of a primary device in such a manner it protrudes above ground up to certain
mounting height
SEE Figure 102.
Key
a primary device
b secondary device
1 operational air gap
2 mechanical air gap
3 covering primary device
4 covering secondary device
5 top of road surface
6 secondary device ground clearance
7 mounting height
Figure 102 – Surface mounted
3.123
fundamental mutual inductance
M
mutual inductance M divided by the primary number of coil turns and divided by the secondary
number of coil turns
Note 1 to entry: The mutual inductance M describes the magnetic interaction and characteristic between the
primary and the secondary coil system.
Note 2 to entry: The value for the fundamental mutual inductance is defined by the geometric coil and ferrite
design and the positioning parameters x, y, z describing the position from the secondary coil system against the
primary coil system. A specific value of the fundamental mutual inductance is valid for a specific position x, y, z.
3.124
gauge device
test device which is intended to verify that a reference primary coils is functioning as designed,
but may be used for testing and development of product devices
3.125
product primary device
primary device intending to prove standard conformance
Note 1 to entry: In symbols, the product primary device is identified by the subscript "P", whereas the reference
primary device is identified by the subscript "R".
3.126
product secondary device
secondary device intending to prove standard conformance

4 Abbreviations
Clause 4 of IEC 61980-1:2015 is applicable except as follows.
Replacement of the title of Clause 4 of IEC 61980-1:2015:
4 Symbols and abbreviated terms
Addition:
Re real of the reflected impedance
Im real and imaginary part of the reflected impedance
C calibration factor of the gauge device as provided by the
TD
gauge device manufacturer
U induced voltage in gauge device, generated by the
i2
primary excitation I × w
1 1
ω
2πf; f = 85 kHz (nominal frequency)
w number of turns of the gauge device
Φ magnetic flux the gauge device is exposed to, excited
1→2
primary coil
M fundamental mutual inductance with w = 1, w = 1
0 1 2
I primary coil current
I × w primary coil specific ampere turns
1 1
Z impedance presented to the secondary device coil by
the secondary device electronics and load
P output power of secondary device measured at the
b,out
RESS (traction battery or adjustable load)
U output voltage of secondary device measured at the
b,out
RESS (traction battery or adjustable load)

5 General
Clause 5 of IEC 61980-1:2015 is applicable except as follows.
Addition:
Unless otherwise specified, all tests shall be carried out in a draft-free location and at an
ambient temperature of 20 °C ± 5 °C.
IEC TS 61980-3 applies to equipment that is designed to be used at an altitude up to 2 000 m.
For equipment designed to be used at altitudes above 2 000 m, it is necessary to take into
account the reduction of the dielectric strength and the cooling effect of the air. Electrical
equipment intended to operate under these conditions is not covered by IEC TS 61980-3 and
should be designed or used in accordance with an agreement between manufacturer and user.
6 Classification
Clause 6 of IEC 61980-1:2015 is applicable except as follows;

– 14 – IEC TS 61980-3:2019  IEC 2019
6.2 Transfer technologies
Addition:
Wireless power transfer between a supply network (mains) and an EV as described in
IEC TS 61980-3 is based on the principle of power transfer via magnetic field between a
primary device and a secondary device and is further referred to as magnetic field wireless
power transfer (MF-WPT).
6.3 Transfer power classes
Replacement:
The manufacturer shall specify the rated input power of the supply device.
A supply device shall be classified according to MF-WPT classes in Table 101.
Table 101 – WPT classes
MF-WPT rated input power
MF-WPT class
kW
MF-WPT1 ≤ 3,7
MF-WPT2 > 3,7 and ≤ 7,7
MF-WPT3 > 7,7 and ≤ 11,1
MF-WPT4 > 11,1 and ≤ 22
MF-WPT5 > 22
NOTE 1 Supply device with MF-WPT input power higher than 11,1 kW are under consideration for further editions
of this document.
NOTE 2 Rated input power can be chosen at any value in the range, for example below 3,7 kW for MF-WPT1, or
in between 3,7 and 7,7 kW for MF-WPT2.
6.5 Installation
Replacement:
The supply device shall be classified according to the type of mounting of the primary device.
– Stationary equipment:
• surface mounting: the primary device is mounted on top of a ground surface;
• flush mounting: the outer casing of the primary device is flush mounted with the ground
surface.
– Non-stationary equipment.
For stationary equipment, see Annex DD for position within the parking spot.
Additional subclauses:
6.101 Z-gap classes
The supply device shall be classified according to their supported secondary device ground
clearances as specified in Table 102.

Table 102 – Supply device Z classes
Secondary device ground clearance range
Supply device Z-class
mm
Z1 100 to 150
Z2 100 to 210
Z3 100 to 250
The secondary device ground clearance is shown as item 6 in Figure 101 and Figure 102,
which is identical to the "mechanical air gap" specified in IEC 61980-1:2015, Figure 6, for
flush mounted systems and as the sum of the "mechanical air gap" and "mounting height" in
IEC 61980-1:2015, Figure 7, for surface mounted systems.
7 Interoperability
Clause 7 of IEC 61980-1:2015 is applicable, except as follows.
Replacement of the title of Clause 7 of IEC 61980-1:2015:
7 System infrastructure requirements
Additional subclauses:
7.101 General
MF-WPT is the transfer of electrical energy from a power source to an electrical load via
magnetic field between a primary and a secondary device without current flow over a galvanic
connection. Figure 103 shows the structure of the functional elements as applied throughout
this document.
NOTE 1 The functional elements may be integrated into one enclosure or split up into several enclosures.

– 16 – IEC TS 61980-3:2019  IEC 2019

Key
1 MF-WPT system
11 primary device 21 secondary device
12 supply power electronics 22 EV power electronics
13 supply equipment communication controller (SECC) 23 EV communication controller (EVCC)
14 supply power circuit 24 EV power circuit (EVPC)

15 supply device 25 EV device
100 supply network 200 RESS
a wireless power flow
b communication
NOTE The numbering convention adopted is based on system blocks being assigned a number with the supply
device blocks having numbers of the form "1X" and the EV device blocks of the form "2X". The second digit
identifies equivalent functionality in the supply and EV sub-systems.
Figure 103 – Components of an MF-WPT system
Interoperability of both sides of the MF-WPT system is achieved when the power transfer
mechanism (i.e. magnetic coupling), related functions and the communications can
interoperate efficiently and safely. Therefore, 7.102 to 7.109 specify the requirements for the
interoperability of the power transfer mechanism and related activities.
The requirements for interoperability of the communications are given in IEC 61980-2.
In order to determine power transfer interoperability, this document specifies reference
EVPCs (R-EVPCs) for each power class and Z class in Annexes AA to BB.
A supply power circuit shall be tested according to Clause 101 with the R-EVPCs of the power
and Z classes with which it is designed to operate. One R-EVPC is specified for each power
class and Z class.
NOTE 2 An approach based on testing with gauges is currently being studied and can be found in Informative
Annex EE.
7.102 Interoperability of power classes
For all MF-WPT classes, the supply power circuits shall be able to deliver complete power to
EVPCs of MF-WPT1, MF-WPT2 and MF-WPT3.
NOTE 1 Complete power is defined as the power level which is the lower of the declared primary device input
power according to the specifications listed in 6.3, or of the output power limit specified by the manufacturer for the
EV device.
NOTE 2 Power transfer and efficiency requirements in case of unmatched power class configurations between EV
device and supply devices are under investigation.
7.103 Z-gap classes
To assure interoperability with product secondary devices, the primary device shall operate
across the whole range of Z-values from the minimum secondary coil ground clearance value
to the maximum value of the Z-Class to which it claims compliance.
Universal interoperability for light duty vehicles is assured by having the primary device rated
as being Z3 capable. This universal class is recommended for deployments where general
access to EVs of random Z-gap heights is desired.
Interoperability is required as follows:
• Z1 primary device shall be able to deliver power to Z1 reference EVPC specified in this
document;
• Z2 primary device shall be able to deliver power to Z1 and Z2 reference EVPCs
specified in this document;
• Z3 primary device shall be able to deliver power to Z1, Z2 and Z3 reference EVPCs
specified in this document.
7.104 MF-WPT system efficiency
Power transfer efficiency is determined as the
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