CEPT
Doc. ECC/SE(15)012
ECC
Electronic Communications Committee
Working Group SE
69th Meeting of WG SE
Salzburg, Austria, 26 – 30 January 2015
Date issued:
20. February 2015
Source:
Portugal
Subject:
WPT – Wireless Power Transfer
Password protection required? (Y/N)
Summary:
Proposal:
Background:
N
Last WGSE meeting it was presented a summary of the work in ITU-R in
relation to Wireless Power Transfer (WPT), namely the approval of ITU-R
Report SM.2303. Also, ETSI ERM has been circulated through the NSO a
new version of the standard EN 300 330, which incorporates WPT.
This document provides an overview of the discussions in different fora,
including IEC and CENELEC.
To be discussed and decide if a LS can be sent to CENELEC, in order to
ask for an update of the discussions in relation to WPT.
The European framework to be applied to WPT is being discussed from
several years (since 2012), however, from the information made available
at ITU and IEC and CENELEC level it seems that no consensus is being
achieved yet.
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1. Introduction
Wireless Power Transfer (WPT) is being discussed in different fora. Last WGSE meeting it was
presented information in relation to the ITU-R work, namely the approval of the ITU-R Report
SM.2303.
This document presents a brief summary on the work performed in other fora.
2. Work performed at ETSI level
At its 61st meeting, WGSE has received from ETSI TC ERM a copy from their letter to EC DGENT TCAM in relation to the European compliance framework for Wireless Charger devices.
In this letter, ETSI ERM answers to the following questions from TCAM, and identified three
relevant cases
Case 1) when the charging device operates without a communication function between the
charger and the charge receiving device, then the EMC standards can define an adequate path for
compliance.
Case 2) when a communication function exists between the charger and the charge receiving
device at the same frequency as the charging energy transfer, then additionally the R&TTE
(SRD) framework and applicable EN can provide an adequate path for compliance.
Case 3) when a communication function exists between the charger and the charge receiving
device at a different frequency to the charging energy transfer, then the R&TTE (SRD)
framework applicable to the frequency band/technology in use could apply to the
communications path whilst the EMC standards can apply to the charger function as for Case 1
above.
The table below summarises the situation observed by ETSI ERM:
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Case
Applicable
Directive
Operating freq
range
Essential requirement
EMF
ISM bands
1
EMC-D
(EN 62479)
9kHz<band<30MHz
R&TTE-D
30MHz<band<1GHz
1GHz<band<40GHz
EMC-D
(wireless
charger
part)
EN 55022
(non ISM eq)
N/A
NO
EN 55022
(non ISM eq)
YES (no radiated
emission limits below
30 MHz)
EN 55011
(ISM eq)
EN 62311
(EN 62479)
EN 301 4891/3
Further consideration
required?
YES (no radiated
emission limits outside
the ISM frequency ranges
defined below 30 MHz for
ISM Group 1 devices –
See NOTE)
EN55011 (ISM
eq)
Non ISM bands
(< 30 MHz)
2
Radio
EN 55011
EN 62311
Non ISM bands
(> 30 MHz)
EMC
EN 300 330
NO
EN 300 220
NO
EN 300 440
NO
Rules for Case 1 apply
YES (no radiated
emission limits outside
the ISM frequency ranges
defined below 30 MHz for
ISM Group 1 devices)
NO
YES (no radiated
emission limits below
30 MHz)
3
NO
R&TTE-D
(communica
tion part)
Depends on the communication technology (e.g. Bluetooth ->
EN 301 489-1/17 ; EN 300 328)
NO
NO
Also, it has been circulated – until October 2014 - the version v.1.8.0 of EN 300 330-1 and EN
300 330-2, where inductive WPT is included. The scope of this standard covers only the Case 2
of the above table, i.e. systems which consist of:
1) A power transmitter, with additional communication capability to control the charge
function in conjunction with the receiving part. The power transmitter could also be named
as charger.
2) A receiver, which supplies the received energy to a battery and performs a
control/supervision function for the battery status and charge operation.
In this standard a Product Class was created, specifically for WPT (Product Class 5), where a set
of requirements are established. In addition the EMC test of the system has to run under EN 301
498-1 and EN 301 498-3.
According to the ETSI standard, the limits in magnetic field established for inductive systems
are also applied for WPT. In relation to the test method:
- it is independent on the power which will be transferred;
- communication + charging frequency must be in the same frequency range;
- the test has to be done in the typical mechanical orientations / setup the WPT systems
(worst case if there are more than one mechanical orientations possible);
- all mode of the system - communication, charging, stand-by,… (parallel or separated) –
must be tested;
For those systems, the following limits apply:
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Finally, it is to be noted that a Technical Report is being developed by ERM TG28.
3. Work performed at IEC level
In August 2012 was approved (after consultation through the NSO’s) a new work item in TC100
with the following title: “Management Protocol of Wireless Power Transfer for Multi-devices
(TC 100)”. In this proposal of new WI, the following overview was given:
“MDWCS is Multi Device Wireless Charging System which stands for provide wireless power
transfer to multi-devices. As shown in Figure 2, Multi Device Wireless Charging System Charger (MDWCS-C) recognizes all Multi Device Wireless Charging System – Devices
(MDWCS-Ds) in MDWCS by wireless communication, and is capable of providing those
MDWCS-Ds with efficient power sharing with management protocol based on collected
charging information by wireless communication and sensors.”
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For more details, see 100/1961/NP of TC 100.
In May 2013, a Draft Technical Report was approved (100/2134/DTR - IEC/TR 62869/Ed.1:
Activities and considerations related to Wireless Power Transfer (WPT) for audio, video and
multimedia systems and equipment), which contains the research undertaken and information
gathered from a survey responses including:
a) terms and definitions used for WPT by IEC TC 100 members;
b) regulations, national laws, public policies and industry practices related to WPT;
c) status of activities and discussions in various organizations relating to regulatory
activities, standards projects, and market research;
d) potential topics to be addressed in IEC TC 100 TR, and
e) potential role for IEC TC 100 in the domain of WPT technical standards development.
In April 2014 was established a TF WPT (Wireless Power Transfer) in CISPR/B. The ToR of
this task are as follows:
1. Determination of focal points of work for power electronic WPT equipment during the
maintenance cycle for the next edition of CISPR 11
a) To check whether the CISPR methods of measurement and the limits for group 2
equipment specified in CISPR 11 in the range 150 kHz up to 18 GHz fit the purpose of
future-proof application to power electronic WPT equipment, and to propose/initiate
adjustments where necessary. At present the methods of measurement and limits apply to
power electronic WPT equipment by default.
b) To determine limits for conducted and radiated disturbances from power electronic WPT
equipment in the range 9 kHz to 150 kHz for incorporation in the future edition of CISPR
11, for equipment that use frequencies in that range for wireless power (and
supplementary data) transfer.
NOTE: In investigating the emission limits below 150 kHz, the trends in other
IEC activities should be considered, such as the establishment of electromagnetic
compatibility levels in SC77A WG8.
c) To investigate in practical measurement arrangements and artificial loads for type tests of
power electronic WPT equipment at standardized test sites for incorporation in the future
edition of CISPR 11.
2. Support of standardization work in TC 69 for WPT equipment for power supply and charging
of electric vehicles (EVs)
a) To check upcoming drafts of the IEC 61980 standards series and to support respective
WGs and PTs in TC 69 with expertise from CISPR/B, in identification and possible
adaption of emission requirements as in CISPR 11 concerning special measurement
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arrangements, test beds, preferred methods of measurement and definition of artificial
loads
b) To assist in keeping coherence between the upcoming EMC product standards of TC 69
for conductive power transfer (CPT) and for wireless power transfer (WPT) of power
supply and charging systems for EVs, as well as with the established emission
requirements in CISPR 11.
c) To gather information on typical technical properties of WPT power supply and charging
equipment for EVs, such as preferred operation frequencies (and frequency ranges),
typical power transmission rates, and trends in practical implementation of different
WPT technologies.
3. Focal point for information to ITU-R and ITU-T regarding power electronic WPT products
a) To consider the material from ITU-R and ITU-T regarding compatibility and coexistence
studies for WPT appliances, radio services and wireline communications.
b) To provide and maintain an overview about typical technical characteristics of modern
power electronic WPT products for further compatibility and coexistence studies with
radio and wireline communications (also considering aspects of power line
communications).
c) To report any needs for adjustments in the established CISPR limits for power electronic
WPT products and their possible impact on the known level of protection of radio
reception.
d) To early announce any needs for international allocation of further dedicated ISM bands
to accommodate present and upcoming power electronic WPT products.
e) To provide the position of CISPR in respect of control of the RFI potential of power
electronic WPT products which use the WPT functionality for basic data transfer.
f) Activities to the 3rd item should result in contributions to ITU-R SG1 study question on
WPT
In June 2014 was approved the standard IEC 61980-1 Ed. 1.0 Electric vehicle wireless power
transfer systems (WPT) - Part 1: General requirements (IEC TC 69 - Electric road vehicles and
electric industrial trucks).
This standard applies to the equipment for the wireless transfer 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 in an operational
state when connected to the supply network, at standard a.c. supply voltages per IEC 60038 up to
1000V a.c. and up to 1500 V d.c. This standard also applies to Wireless Power Transfer (WPT)
equipment supplied from on-site storage systems (e.g. buffer batteries etc.).
The aspects covered in this standard include:
 the characteristics and operating conditions of the off-board supply equipment;
 the specification for required level of electrical safety for the off-board supply
equipment;
 Requirements for basic communication for safety and process matters if required by a
WPT system;
 Requirements for basic positioning for efficiency and process matters if required by a
WPT system.
 Requirements for two- and three-wheel vehicles are under consideration
 Requirements for WPT system while driving are under consideration;
 Requirements for bidirectional power transfer are under consideration
 the connection to installations according to IEC 60364-7-722;
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
Specific EMC requirements for WPT systems to the extent not covered by IEC 6185121-2.
This standard defines limits of the magnetic field strength for WPT systems (for radiated
emissions):
Limits of the magnetic field strength for WPT system (150kHz-30MHz)
Also, this standard defines limits for the radiated emissions on 30-1000MHz, referring to the
existing limits in Table 9 (Class A) or Table 11 (Class B) as well the measurements methods to
and using the test equipment referenced in CISPR 11 as appropriate.
In relation to WPT with vehicle radiated emissions, this standard refers to CISPR 22, applying
the limit of clause 4.
It is to be noted that CISPR 11 do not define any electromagnetic disturbance limits for 9 kHz to
30 MHz for Group 1 (other than Group 2). For Group 2 (transfer of energy used only for the
treatment of material or inspection/analysis purposes) limits are defined for 150 kHz to
1000 MHz. So, for WPT equipment – if classified as Group 2- only limits bellow 150 KHz still
to be defined.
In October 2014 started the circulation through the NSO’s for comments the documents:
 69/322/CD - EC 61980-2/Ed.1: 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; and
 69/321/CD - IEC 61980-3/Ed.1: ELECTRIC VEHICLE WIRELESS POWER TRANSFER
(WPT) SYSTEMS - Part 3: Specific requirements for the magnetic field wireless power
transfer systems).
4. Work performed at ITU level
As referred last WGSE meeting, the report ITU-R SM.2302 was approved at the last ITU-R SG1
meeting in June 2014. This report contains information from different WPT devices, namely the
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application type of WPT, frequency and power ranges. To be noted that only the power transfer
is being analysed in this report, i.e., communications are not discussed.
5. Discussion
From the IEC documents, it is concluded that WPT community is working on standards for WPT
with communication capabilities. Up to now, WPT for electric vehicles (for standard a.c. supply
voltages up to 1000V a.c. and up to 1500 V d.c.) is being standardised.
At its last CENELEC/TC210 meeting (in Brussels 16th to 17th of December, 2014) there wasn’t
much discussion in relation to WPT but only the applicable framework, i.e., if WPT systems will
or not have a communication part.
Finally, it is to be noted that the frequencies to be used by WPT are outside the range identified
in RR 5.138 (subject to special authorization) and RR. 5.150. Therefore, it seems that an
allocation for ISM is being proposed by IEC, and the limits are quite above the limits for out-ofband/spurious presented in ERC/REC 70-03 and EN 300 330.
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