SIST EN IEC 61980-3:2023
(Main)Electric vehicle wireless power transfer (WPT) systems - Part 3: Specific requirements for the magnetic field wireless power transfer systems (IEC 61980-3:2022)
Electric vehicle wireless power transfer (WPT) systems - Part 3: Specific requirements for the magnetic field wireless power transfer systems (IEC 61980-3:2022)
This part of IEC 61980 applies to the off-board supply equipment for wireless power transfer via magnetic field (MF-WPT) 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 voltage ratings per IEC 60038 up to 1 000 V AC and up to 1 500 V DC from the supply network. The power transfer takes place while the electric vehicle (EV) is stationary.
Off-board supply equipment fulfilling the requirements in this document are intended to operate with EV devices fulfilling the requirements described in ISO 19363.
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 MF111 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 MF-WPT systems for two- and three-wheel vehicles,
- requirements for MF-WPT systems supplying power to EVs in motion, and
- requirements for bidirectional power transfer.
- requirements for flush mounted primary devices
- requirements for MF-WPT systems for heavy duty vehicles
- requirements for MF-WPT systems with inputs greater than 11,1 kVA
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.
Kontaktlose Energieübertragungssysteme (WPT) für Elektrofahrzeuge - Teil 3: Besondere Anforderungen für die kontaktlosen Energieübertragungssysteme mit Magnetfeld (IEC 61980-3:2022)
Systèmes de transfert de puissance sans fil (WPT) pour véhicules électriques - Partie 3: Exigences spécifiques pour les systèmes de transfert de puissance sans fil par champ magnétique (IEC 61980-3:2022)
L'IEC 61980-3:2022 s'applique au matériel d'alimentation non embarqué pour le transfert de puissance sans fil par champ magnétique (MF-WPT) aux véhicules électriques routiers, afin d'assurer l'alimentation en énergie électrique du RESS (système de stockage d'énergie rechargeable) et/ou d'autres systèmes électriques embarqués. Le système MF-WPT fonctionne aux tensions d'alimentation assignées normalisées selon l'IEC 60038, jusqu'à 1 000 V en courant alternatif et jusqu'à 1 500 V en courant continu, du réseau d'alimentation. Le transfert de puissance a lieu lorsque le véhicule électrique (VE) est immobile.
Un matériel d'alimentation non embarqué qui satisfait aux exigences du présent document est prévu pour fonctionner avec des dispositifs de VE qui satisfont aux exigences décrites dans l'ISO 19363.
Le présent document couvre:
– les caractéristiques et les conditions de fonctionnement;
– le niveau exigé de sécurité électrique;
– les exigences de communication de base pour les questions de sécurité et de processus, si un système MF WPT l'exige;
– les exigences de positionnement pour assurer un transfert de puissance MF-WPT efficace et sûr; et
– les exigences de compatibilité électromagnétique (CEM) spécifiques aux systèmes MF WPT.
Les aspects suivants sont à l'étude pour les documents ultérieurs:
– les exigences relatives aux systèmes MF-WPT pour véhicules à deux et trois roues;
– les exigences relatives aux systèmes MF-WPT qui alimentent les VE en mouvement;
– les exigences relatives au transfert de puissance bidirectionnel;
– les exigences relatives aux dispositifs principaux encastrés;
– les exigences relatives aux systèmes MF-WPT pour véhicules utilitaires lourds; et
– les exigences relatives aux systèmes MF-WPT avec des puissances d'entrée supérieures à 11,1 kVA.
Le présent document ne s'applique pas
– aux aspects de sécurité relatifs à la maintenance; et
– aux trolleybus, aux véhicules ferroviaires et aux véhicules conçus principalement pour une exploitation non routière.
L'IEC 61980-3:2022 doit être utilisée conjointement avec l'IEC 61980-1:2020.
Brezžični sistemi za prenos električne energije za električna vozila (WPT) - 3. del: Posebne zahteve za sistem brezžičnega prenosa energije z magnetnim poljem (IEC 61980-3:2022)
Ta del standarda IEC 61980 se uporablja za vgradno napajalno opremo za brezžični prenos energije prek magnetnega polja (MF-WPT) v električna cestna vozila za namene dovajanja električne energije sistemu RESS (sistemu za shranjevanje energije z možnostjo polnjenja) in/ali drugim električnim sistemom v vozilih. Sistem MF-WPT deluje s standardnimi nazivnimi napajalnimi napetostmi v skladu s standardom IEC 60038 do 1000 V izmenične napetosti in do 1500 V enosmerne napetosti iz napajalnega omrežja. Prenos energije poteka, ko električno vozilo (EV) miruje.
Zunanja napajalna oprema, ki izpolnjuje zahteve iz tega dokumenta, je namenjena delovanju z napravami električnega vozila, ki izpolnjujejo zahteve, opisane v standardu ISO 19363.
V tem dokumentu so zajeti naslednji vidiki:
– lastnosti in pogoji delovanja;
– zahtevana raven električne varnosti;
– zahteve za osnovno komunikacijo za varnostne in procesne zadeve, če jih zahteva sistem MF111 WPT;
– zahteve glede položaja za zagotavljanje učinkovitega in varnega prenosa energije MF-WPT; in
– posebne zahteve glede elektromagnetne združljivosti sistemov MF-WPT.
Za morebitno vključitev v prihodnje dokumente se obravnavajo naslednji vidiki:
– zahteve za sisteme MF-WPT za dvo- in trikolesna vozila;
– zahteve za sisteme MF-WPT, ki napajajo električna vozila v gibanju;
– zahteve za dvosmerni prenos energije;
– zahteve za vgrajene primarne naprave;
– zahteve za sisteme MF-WPT za težka motorna vozila;
– zahteve za sisteme MF-WPT z vhodno energijo nad 11,1 kVA.
Ta standard se ne uporablja za:
– varnostne vidike v povezavi z vzdrževanjem; in
– trolejbuse, železniška vozila in vozila, ki so namenjena predvsem za uporabo zunaj cestišč.
OPOMBA: Izrazi, uporabljeni v tem dokumentu, veljajo posebej za sisteme MF-WPT.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 61980-3:2023
01-februar-2023
Nadomešča:
SIST-TS CLC IEC/TS 61980-3:2020
Brezžični sistemi za prenos električne energije za električna vozila (WPT) - 3. del:
Posebne zahteve za sistem brezžičnega prenosa energije z magnetnim poljem (IEC
61980-3:2022)
Electric vehicle wireless power transfer (WPT) systems - Part 3: Specific requirements
for the magnetic field wireless power transfer systems (IEC 61980-3:2022)
Kontaktlose Energieübertragungssysteme (WPT) für Elektrofahrzeuge - Teil 3:
Besondere Anforderungen für die kontaktlosen Energieübertragungssysteme mit
Magnetfeld (IEC 61980-3:2022)
Systèmes de transfert de puissance sans fil (WPT) pour véhicules électriques - Partie 3:
Exigences spécifiques pour les systèmes de transfert de puissance sans fil par champ
magnétique (IEC 61980-3:2022)
Ta slovenski standard je istoveten z: EN IEC 61980-3:2022
ICS:
43.120 Električna cestna vozila Electric road vehicles
SIST EN IEC 61980-3:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 61980-3:2023
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SIST EN IEC 61980-3:2023
EUROPEAN STANDARD EN IEC 61980-3
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2022
ICS 43.120 Supersedes CLC IEC/TS 61980-3:2020
English Version
Electric vehicle wireless power transfer (WPT) systems - Part 3:
Specific requirements for magnetic field wireless power transfer
systems
(IEC 61980-3:2022)
Systèmes de transfert de puissance sans fil (WPT) pour Kontaktlose Energieübertragungssysteme (WPT) für
véhicules électriques - Partie 3: Exigences spécifiques pour Elektrofahrzeuge - Teil 3: Besondere Anforderungen für die
les systèmes de transfert de puissance sans fil par champ kontaktlosen Energieübertragungssysteme mit Magnetfeld
magnétique (IEC 61980-3:2022)
(IEC 61980-3:2022)
This European Standard was approved by CENELEC on 2022-12-22. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61980-3:2022 E
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SIST EN IEC 61980-3:2023
EN IEC 61980-3:2022 (E)
European foreword
The text of document 69/857/FDIS, future edition 1 of IEC 61980-3, prepared by IEC/TC 69 "Electrical
power/energy transfer systems for electrically propelled road vehicles and industrial trucks" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61980-3:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-09-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-12-22
document have to be withdrawn
This document supersedes CLC IEC/TS 61980-3:2020 and all of its amendments and corrigenda (if
any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 61980-1:2021.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61980-3:2022 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60038 NOTE Harmonized as EN 60038
IEC 61786-1 NOTE Harmonized as EN 61786-1
ISO 15118-1:2019 NOTE Harmonized as EN ISO 15118-1:2019 (not modified)
2
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SIST EN IEC 61980-3:2023
EN IEC 61980-3:2022 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60529 - Degrees of protection provided by - -
enclosures (IP Code)
IEC 61439-1 2020 Low-voltage switchgear and controlgear EN IEC 61439-1 2021
assemblies - Part 1: General rules
IEC 61439-7 2018 Low-voltage switchgear and controlgear - -
assemblies - Part 7: Assemblies for specific
applications such as marinas, camping sites,
market squares, electric vehicle charging
stations
IEC 61980-1 2020 Electric vehicle wireless power transfer EN IEC 61980-1 2021
(WPT) systems - Part 1: General
requirements
1 2
IEC 61980-2 — Electric vehicle wireless power transfer EN IEC 61980-2 —
(WPT) systems - Part 2: Specific
requirements for communication between
electric road vehicles (EV) and infrastructure
with respect to wireless power transfer
(WTP) systems
ISO 19363 2020 Electrically propelled road vehicles - EN ISO 19363 2021
Magnetic field wireless power transfer -
Safety and interoperability requirements
ISO 20653 - Road vehicles - Degrees of protection (IP - -
code) - Protection of electrical equipment
against foreign objects, water and access
ICNIRP - ICNIRP guidelines for limiting exposure to - -
time-varying electric and magnetic fields
(1 Hz – 100 kHz), Health Physics
99(6):818‐836; 2010
1
Under preparation. Stage at the time of publication: IEC/AFDIS 61980-2:2022.
2
Under preparation. Stage at the time of publication: prEN IEC 61980-2:2021.
3
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SIST EN IEC 61980-3:2023
EN IEC 61980-3:2022 (E)
Publication Year Title EN/HD Year
Recommendation 2019 Guidance on frequency ranges for operation
ITU-R SM.2110-1 of nonbeam wireless power transmission for
electric vehicles
4
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SIST EN IEC 61980-3:2023
IEC 61980-3
®
Edition 1.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electric vehicle wireless power transfer (WPT) systems –
Part 3: Specific requirements for magnetic field wireless power transfer systems
Systèmes de transfert de puissance sans fil (WPT) pour véhicules électriques –
Partie 3: Exigences spécifiques pour les systèmes de transfert de puissance
sans fil par champ magnétique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 43.120 ISBN 978-2-8322-6023-4
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 61980-3:2023
– 2 – IEC 61980-3:2022 © IEC 2022
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
4 Abbreviated terms . 15
5 General . 15
6 Classification . 15
7 General supply device requirements . 17
7.1 General architecture . 17
7.2 Power transfer requirements . 18
7.3 Efficiency . 21
7.4 Alignment . 22
7.5 Activities provided by WPT system . 22
8 Communication . 24
9 Power transfer interoperability . 24
10 Protection against electric shock . 25
10.1 General requirements . 25
10.2 Degree of protection against access to hazardous-live-parts . 25
11 Specific requirements for WPT systems . 25
12 Power cable requirements . 29
13 Constructional requirements . 30
13.1 Supply device dimensions and installation requirements . 30
13.4 IP degrees . 30
14 Strength of materials and parts . 30
15 Service and test conditions . 31
16 Electromagnetic compatibility (EMC) . 32
16.1 Load and operating conditions . 32
17 Marking and instructions . 38
Annex A (normative) Circular reference EVPC . 54
A.1 Circular reference EVPCs for MF-WPT1 . 54
A.2 Circular reference EVPCs for MF-WPT1/MF-WPT2 . 63
A.3 Circular reference EVPCs for MF-WPT3 . 72
Annex B (informative) Examples of other secondary devices. 82
B.1 DD secondary device for MF-WPT1/Z1 . 82
B.2 DD secondary device for MF-WPT1/Z2 . 83
B.3 DD secondary device for MF-WPT2/Z1 . 83
B.4 DD secondary device for MF-WPT2/Z2 . 84
B.5 DD secondary device for MF-WPT2/Z3 . 85
B.6 DD secondary device for MF-WPT3/Z1 . 86
B.7 DD secondary device for MF-WPT3/Z2 . 87
B.8 DD secondary device for MF-WPT3/Z3 . 88
Annex C (informative) Coil position in parking spot . 90
C.1 General . 90
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C.2 Width of vehicles and parking spots . 90
C.3 Placement along the direction of travel . 90
Annex D (informative) Theoretical approach for system interoperability . 92
D.1 General . 92
D.2 Magnetic and electric interoperability . 92
D.3 Compliance test and measurement specifications . 109
Annex E (informative) Determining centre alignment point . 116
E.1 General . 116
E.2 Laboratory procedure for determining the approximate centre alignment
point of a primary device of an SPC with a secondary device of a reference
EVPC . 116
E.3 Laboratory procedure for determining the approximate centre alignment
point of an EVPC with a primary device of a reference SPC . 116
E.4 Determining the centre alignment point for a coil pair through simulation . 116
Bibliography . 117
Figure 101 – Surface mounted . 16
Figure 102 – Flush mounted . 16
Figure 1 – Example of an MF-WPT system . 18
Figure 103 – Test bench protection areas . 27
Figure 104 – Example of test bench setup (version 1) – View from above . 33
Figure 105 – Example of test bench setup (version 2) – View from above . 34
Figure 106 – Side view of test setup shown in Figure 104 . 35
Figure 107 – Example of vehicle test setup (version 1) – View from above . 36
Figure 108 – Example of vehicle test setup (version 2) – View from above . 37
Figure 109 – Side view of test setup shown in Figure 107 . 38
Figure 110 – Illustration of test positions . 41
Figure A.1 – Mechanical dimensions of the MF-WPT1/Z1 reference secondary device . 55
Figure A.2 – Schematic of the EV power electronics for the MF-WPT1/Z1 reference
EVPC . 56
Figure A.3 – Impedance compensation circuit . 56
Figure A.4 – Example of a rectifier circuit . 57
Figure A.5 – Mechanical dimensions of the MF-WPT1/Z2 reference secondary device . 58
Figure A.6 – Schematic of the EV power electronics for the MF-WPT1 reference EVPC . 59
Figure A.7 – Impedance compensation circuit . 59
Figure A.8 – Example of a rectifier circuit . 60
Figure A.9 – Mechanical dimensions of the MF-WPT1/Z3 reference secondary device . 61
Figure A.10 – Schematic of the EV power electronics for the MF-WPT1/Z3 reference
EVPC . 62
Figure A.11 – Impedance compensation circuit . 62
Figure A.12 – Example of a rectifier circuit . 63
Figure A.13 – Mechanical dimensions of the MF-WPT1 and MF-WPT2 Z1 reference
secondary device . 64
Figure A.14 – Schematic of the EV power electronics for the MF-WPT1 and MF-WPT2
Z1 reference EVPC . 65
Figure A.15 – Example of an impedance compensation circuit using variable
reactances . 65
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Figure A.16 – Example of a rectifier circuit . 66
Figure A.17 – Mechanical dimensions of the MF-WPT1 and MF-WPT2 Z2 reference
secondary device . 67
Figure A.18 – Schematic of the EV power electronics for the MF-WPT1 and MF-WPT2
Z2 reference EVPC . 68
Figure A.19 – Example of impedance compensation circuit using variable reactances . 68
Figure A.20 – Example of a rectifier circuit . 69
Figure A.21 – Mechanical dimensions of the MF-WPT1 and MF-WPT2 Z3 reference
secondary device . 70
Figure A.22 – Schematic of the EV power electronics for the MF-WPT1 and MF-WPT2
reference EVPC . 71
Figure A.23 – Example of impedance compensation circuit using variable reactances . 71
Figure A.24 – Example of a rectifier circuit . 72
Figure A.25 – Mechanical dimensions of the MF-WPT3/Z1 reference secondary device . 73
Figure A.26 – Schematic of the EV power electronics for the MF-WPT3 reference
EVPC . 74
Figure A.27 – Example for impedance compensation circuit using variable reactances . 74
Figure A.28 – Example for an output filter and rectifier . 75
Figure A.29 – Mechanical dimensions of the MF-WPT3/Z2 reference secondary device . 76
Figure A.30 – Schematic of the EV power electronics for the MF-WPT3/Z2 reference
EVPC . 77
Figure A.31 – Example for impedance compensation circuit using variable reactances . 77
Figure A.32 – Example of an output filter and rectifier . 78
Figure A.33 – Mechanical dimensions of the MF-WPT3/Z3 reference secondary device . 79
Figure A.34 – Schematic of the EV power electronics for the MF-WPT3 reference
EVPC . 80
Figure A.35 – Example of an impedance compensation circuit using variable
reactances . 80
Figure A.36 – Example of an output filter and rectifier . 81
Figure B.1 – Mechanical dimensions of the MF-WPT1/Z1 DD secondary device. 82
Figure B.2 – Mechanical dimensions of the MF-WPT1/Z2 DD secondary device. 83
Figure B.3 – Mechanical dimensions of the MF-WPT2/Z1 DD secondary device. 84
Figure B.4 – Mechanical dimensions of the MF-WPT2/Z2 DD secondary device. 85
Figure B.5 – Mechanical dimensions of the MF-WPT2/Z3 DD secondary device. 86
Figure B.6 – Mechanical dimensions of the MF-WPT3/Z1 DD secondary device. 87
Figure B.7 – Mechanical dimensions of the MF-WPT3/Z2 DD secondary device. 88
Figure B.8 – Mechanical dimensions of the MF-WPT3/Z3 DD secondary device. 89
Figure D.1 – General schematic of the concept showing the coils with their ports to the
power electronics and the varying parameters . 93
Figure D.2 – Schematic to explain impedance . 100
Figure D.3 – General behaviour of the reflected impedance (example) . 102
Figure D.4 – Impedance space at the primary coil (example) . 107
Figure D.5 – Impedance spaces of the reference primary coil and alternate electronics . 108
Figure D.6 – Test set-up for reference or product primary coil electric interoperability
conformance tests . 110
Figure D.7 – Coaxial coil gauge device "CC325" . 113
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Figure D.8 – Transversal coil gauge device "DD275" . 115
Table 101 – MF-WPT power classes . 16
Table 102 – Supported secondary device ground clearance range . 17
Table 103 – Compatibility class A supply device output power ramp rates . 20
Table 104 – Minimum power transfer efficiency with compatibility class A supply device
and normative reference EV device of same power class . 21
Table 105 – Minimum power transfer efficiency with compatibility class A supply device
and normative reference EV device of different power classes . 21
Table 106 – Minimum power transfer efficiency for a compatibility class B supply
device and specified EVPC . 22
Table 107 – Alignment tolerance of a primary device (compatibility class A) . 22
Table 108 – Summary requirements according to compatibility class . 23
Table 109 – Alignment positions and offset values for primary devices which are part of
compatibility class A supply devices . 42
Table 110 – Compatibility class A test 2 test positions . 44
Table 111 – Example of compatibility class B supply device test 2 test positions . 47
Table 112 – Test bodies for touch hazard . 48
Table 113 – Test objects for ignition risk test . 48
Table 114 – Vehicle detection action. 53
Table A.1 – Values of circuit elements for Figure A.2 . 56
Table A.2 – Range of coupling factors . 57
Table A.3 – Values of circuit elements for Figure A.6 . 59
Table A.4 – Range of coupling factors . 60
Table A.5 – Values of circuit elements for Figure A.10 . 62
Table A.6 – Range of coupling factors . 63
Table A.7 – Values of circuit elements for Figure A.14 . 65
Table A.8 – Values of variable reactances . 66
Table A.9 – Coupling factors and coil current MF- WPT1 and MF-WPT2 Z1 . 66
Table A.10 – Values of circuit elements for Figure A.18 . 68
Table A.11 – Values of variable reactances . 69
Table A.12 – Coupling factors and coil current MF- WPT1 and MF-WPT2 Z2 . 69
Table A.13 – Values of circuit elements for Figure A.22 . 71
Table A.14 – Values of variable reactances . 72
Table A.15 – Coupling factors and coil current MF- WPT1 and MF-WPT2 Z3 . 72
Table A.16 – Values of circuit elements for Figure A.26 . 74
Table A.17 – Values of variable reactances . 75
Table A.18 – Inductance values for Figure A.28 . 75
Table A.19 – Coupling factors and coil current MF- WPT3/Z1 . 75
Table A.20 – Values of circuit elements for Figure A.30 . 77
Table A.21 – Values of variable reactances . 78
Table A.22 – Inductance values for Figure A.32 . 78
Table A.23 – Coupling factors and coil current MF- WPT3/Z2 . 78
Table A.24 – Values of circuit elements for Figure A.17 . 80
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Table A.25 – Values of variable reactances . 80
Table A.26 – Inductance values for Figure A.19 . 81
Table A.27 – Couplin
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