Consideration of energy efficiency in wireless power transfer technology

IEC TR 63231:2019 describes the technical background of current energy efficiency efforts related to wireless power transfer (WPT) technology and commercially available products related to related to audio, video and multimedia systems and equipment. This Technical Report examines use cases, standardization efforts of other standards development organizations (SDOs) and known national regulations. This document concludes with observations and recommendations for the potential future technical standards development activities within the scope of TC 100.

General Information

Status
Published
Publication Date
21-Aug-2019
Current Stage
PPUB - Publication issued
Completion Date
22-Aug-2019
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IEC TR 63231
Edition 1.0 2019-08
TECHNICAL
REPORT
colour
inside
Consideration of energy efficiency in wireless power transfer technology
IEC TR 63231:2019-08(en)
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---------------------- Page: 2 ----------------------
IEC TR 63231
Edition 1.0 2019-08
TECHNICAL
REPORT
colour
inside
Consideration of energy efficiency in wireless power transfer technology
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.99 33.160.99 ISBN 978-2-8322-7240-4

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TR 63231:2019  IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions and abbreviated terms ........................................................................ 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Abbreviated terms ................................................................................................... 6

4 Overview of the WPT system ........................................................................................... 6

4.1 General ................................................................................................................... 6

4.2 Magnetic induction WPT systems ............................................................................ 7

4.3 Magnetic resonance WPT systems.......................................................................... 7

4.4 Microwave (RF) used in WPT systems .................................................................... 7

4.5 Capacitive wireless power transfer (CPT)................................................................ 7

5 WPT product use cases ................................................................................................... 7

5.1 General ................................................................................................................... 7

5.2 Receivers ............................................................................................................... 8

5.2.1 Smartphones ................................................................................................... 8

5.2.2 Smartwatches .................................................................................................. 8

5.2.3 Laptops ........................................................................................................... 8

5.3 Transmitters ............................................................................................................ 8

5.3.1 Vertical figure product...................................................................................... 8

5.3.2 Car-installed product ....................................................................................... 8

5.3.3 Car-mounted product ....................................................................................... 9

5.4 Furniture ................................................................................................................. 9

6 Overview of various organization’s activities including standardization ............................ 9

6.1 General ................................................................................................................... 9

6.2 National movement ............................................................................................... 10

6.2.1 Europe........................................................................................................... 10

6.2.2 United States of America ............................................................................... 10

6.2.3 Korea ............................................................................................................ 10

6.2.4 China ............................................................................................................. 11

6.2.5 Japan ............................................................................................................ 11

6.3 SDO movements ................................................................................................... 11

6.3.1 Wireless Power Consortium (WPC) ................................................................ 11

6.3.2 AirFuel Alliance ............................................................................................. 11

6.3.3 Consumer Technology Association (CTA) ...................................................... 11

6.3.4 European Telecommunications Standards Institute (ETSI) ............................. 11

7 Areas to consider .......................................................................................................... 12

7.1 How to pair WPT Tx and WPT Rx ......................................................................... 12

7.2 Placement of WPT Rx on a WPT Tx charger ......................................................... 12

7.3 Testing equipment ................................................................................................ 12

8 New standard requirements ........................................................................................... 12

Annex A (informative) Overview of ANSI/CTA-2042.3, Methods of Measurement for

Power Transfer Efficiency and Standby Power of Wireless Power Systems (CTA) ......... 13

A.1 Overview............................................................................................................... 13

A.2 Power transfer efficiency – use cases ................................................................... 13

A.3 Power transfer efficiency – test procedure overview .............................................. 13

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IEC TR 63231:2019  IEC 2019 – 3 –

Bibliography .......................................................................................................................... 14

Figure 1 – Example of vertical charging pad............................................................................ 8

Figure 2 – Example of car-installed product ............................................................................ 8

Figure 3 – Example of car mounted product ............................................................................ 9

Figure 4 – Example of furniture charging product .................................................................... 9

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– 4 – IEC TR 63231:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONSIDERATION OF ENERGY EFFICIENCY
IN WIRELESS POWER TRANSFER TECHNOLOGY
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 international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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The main task of IEC technical committees is to prepare International Standards. However, a

technical committee may propose the publication of a technical report when it has collected

data of a different kind from that which is normally published as an International Standard, for

example "state of the art".

IEC TR 63231, which is a technical report, has been prepared by TA15: Wireless Power

Transfer, of IEC technical committee TC 100: Audio, video and multimedia systems and

equipment.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
100/3186/DTR 100/3262/RVDTR

Full information on the voting for the approval of this technical report 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.

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IEC TR 63231:2019  IEC 2019 – 5 –

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.
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IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

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of its contents. Users should therefore print this document using a colour printer.

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– 6 – IEC TR 63231:2019  IEC 2019
CONSIDERATION OF ENERGY EFFICIENCY
IN WIRELESS POWER TRANSFER TECHNOLOGY
1 Scope

This Technical Report (TR) describes the technical background of current energy efficiency

efforts related to wireless power transfer (WPT) technology and commercially available

products related to related to audio, video and multimedia systems and equipment. This

Technical Report examines use cases, standardization efforts of other standards development

organizations (SDOs) and known national regulations. This document concludes with

observations and recommendations for the potential future technical standards development

activities within the scope of TC 100.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and abbreviated terms
For the purposes of this document, the following terms and definitions 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 Terms and definitions
3.1.1
WPT Tx
wireless power transfer transmitter
device that transmits power to the receiver

Note 1 to entry: Examples of WPT Tx are charging pads, which are portable, car-mounted, or furniture-mounted.

3.1.2
WPT Rx
wireless power transfer receiver
device that receives power from the transmitter, which is a charging pad
Note 1 to entry: Examples of Rx are smartphones, laptops, smartwatches.
3.2 Abbreviated terms
WPT wireless power transfer
DTBC device to be charged
4 Overview of the WPT system
4.1 General

Clause 4 describes an overview of WPT systems, which include WPT technologies, applications

and coupling methods.
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IEC TR 63231:2019  IEC 2019 – 7 –
4.2 Magnetic induction WPT systems

An alternating electric current flowing through a coil (source) generates a magnetic field that

acts on a receiver coil to produce a current within it, and thus electric power is transferred

between the source and device-to-be-charged (DTBC) coils.

Tight magnetic coupling between the two coils helps achieve high transfer efficiency. Because

the electric power transfer distance is short, typically measured in the mm range, the WPT by

the e
...

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