IEC TS 62700:2014

IEC TS 62700 ®
Edition 1.0 2014-02
TECHNICAL
SPECIFICATION
colour
inside
DC power supply for notebook computers

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IEC TS 62700 ®
Edition 1.0 2014-02
TECHNICAL
SPECIFICATION
colour
inside
DC power supply for notebook computers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 29.120; 35.180 ISBN 978-2-8322-1401-5

– 2 – TS 62700 © IEC:2014(E)
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions. 8
3.2 Abbreviations . 8
4 Electrical specification (performance characteristics) . 9
4.1 AC input rating . 9
4.2 Inrush current . 9
4.3 DC output load condition and voltage regulation . 9
4.4 DC output ripple and noise . 9
4.5 Output transient response and capacitor load . 9
4.6 Power supply timing . 9
4.6.1 Turn on delay time . 9
4.6.2 Hold-up time . 9
4.6.3 Rise time of output voltage . 9
4.7 Protection . 10
4.7.1 Over-current protection . 10
4.7.2 Short-circuit protection . 10
4.8 Over shoot . 10
5 DC power supply identification and communication method for notebook
computers . 10
6 Connectors for DC power supply for notebook computer . 12
6.1 General . 12
6.2 Specification for DC connectors . 13
6.2.1 General . 13
6.2.2 Shape and dimension of DC connectors . 13
6.2.3 Voltage polarity and electrical specification of DC connectors . 13
6.3 Cable qualities . 13
6.3.1 General . 13
6.3.2 Special considerations for an AC adapter with replaceable cable . 13
Annex A (informative) Summary of discussion in project team IEC 62700 . 14
Annex B (informative) Ad-hoc activities. 16
Annex C (informative) AC adapters used with notebook computers – Areas to be
investigated . 20
C.1 Safety . 20
C.2 EMC . 20
C.3 Future trends in connectivity and power delivery . 20
Annex D (informative) Expected issues when any adapter is connected to any host
PC . 21
D.1 Safety issues . 21
D.1.1 Over-voltage protection . 21
D.1.2 Over-current protection and short circuit protection . 21

TS 62700 © IEC:2014(E) – 3 –
D.1.3 Leakage current. 21
D.1.4 Peak current . 21
D.1.5 Surge and ringing . 21
D.1.6 Surface temperature of enclosure of AC adapters . 21
D.1.7 Risk of electric shock . 21
D.2 EMC issues . 22
D.2.1 Load change . 22
D.2.2 Input power circuit of PC . 22
D.3 Environment issues . 22
D.3.1 Inrush current . 22
D.3.2 General specifications . 22
D.3.3 High-efficiency technology . 22
D.4 Reliability and quality issues . 22
D.4.1 Life time . 22
D.4.2 Extraordinary noise . 23
D.5 Standards issues . 23
D.5.1 Environments . 23
D.5.2 EMC evaluation . 23
D.5.3 EMC class . 23
D.5.4 Safety evaluation . 23
D.5.5 LPS requirements . 23
D.5.6 Plug . 23
D.5.7 Marking of electrical ratings on PC . 23
D.6 Other issues . 24
Annex E (informative) Electrical specification . 25
E.1 DC output load condition and voltage regulation . 25
E.2 Over-current protection . 26
Bibliography . 27

Figure 1 – Shape of the plug . 12
Figure B.1 – Radiated emission . 17
Figure B.2 – Conducted emission . 18
Figure B.3 – Conducted emission . 19

Table 1 – Dimensions of the plug . 12

– 4 – TS 62700 © IEC:2014(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DC POWER SUPPLY FOR NOTEBOOK COMPUTERS

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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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 62700, which is a technical specification, has been prepared by technical area 14:
Interfaces and methods of measurement for personal computing equipment of IEC technical
committee 100: Audio, video and multimedia systems and equipment.

TS 62700 © IEC:2014(E) – 5 –
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
100/2170/DTS 100/2231/RVC
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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International Standard,
• 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.
– 6 – TS 62700 © IEC:2014(E)
INTRODUCTION
In consideration of global discussion on reducing e-waste and improving re-usability of power
supplies, this Technical Specification addresses the common electro-mechanical
characteristics for AC adapters used with a specified array of notebook computers.
In the current market, hundreds of millions of notebook computers are shipped every year
with AC adapters which can typically be shared between generations of OEM notebook
computers. A wide range of notebook computers are designed to meet unique market
requirements and specific purposes. Each AC adapter is tuned and designed to optimally
satisfy the requirements and specifications of the target notebook computers.
Specific combinations of OEM supplied AC adapters and notebook computers are tested and
certified as a system in compliance with existing regulations and standards. Failing
combinations are not shipped by the OEM to the consumer. This approach promotes
consumer satisfaction, safety, and product reliability, while reducing the encroachment of
poorly designed or manufactured aftermarket substitutes which may affect the operation of
the notebook computer in compliance with regulatory requirements. Additionally, arbitrary
combinations of AC adapters and notebook computers have been known to present functional
and regulatory safety and EMC compliance issues for the notebook computer. These risks
should be considered in any development or adoption of specifications for common AC
adapters.
The objective of a common DC power supply is to support global interoperability of adapters
for a specific range of notebook computers. This Technical Specification describes design
considerations for the common adapters and identifies technical areas that require further
development for interoperability with existing notebook computer technologies. The open
technical and regulatory compliance issues identified within this Technical Specification which
affect both AC adapters and the host notebook computers should be resolved before this
specification can be considered as a normative within other standards or regulatory policies
and before IEC standardization of the subject matter can be completed.
This Technical Specification also identifies important considerations required to maintain the
high standard of safety, compliance and performance expected by users of notebook
computers and global regulatory agencies.
The development of this Technical Specification is described in Annex A. Annexes C, D and E
describe additional important areas which are required to be resolved in further
standardization work.
The objective for future IEC standardization work will be to complete the development of the
technical specifications which incorporates considerations for consumer safety, product
reliability, system performance, regulatory compliance and technical innovations.

TS 62700 © IEC:2014(E) – 7 –
DC POWER SUPPLY FOR NOTEBOOK COMPUTERS

1 Scope
This Technical Specification states the minimum requirements for DC power supply for
notebook computers. Specifically, it gives
– an electrical specification (performance characteristics),
– an ID pin method,
– a connector for DC power output.
The no-load power and power efficiency are outside the scope of this Technical Specification.
Note that safety requirements are covered by IEC 60950-1 and EMC requirements are
covered by CISPR 22 and CISPR 24. CISPR 32 may be used in place of CISPR 22 for this
purpose. These requirements are neither re-stated nor challenged by this Technical
Specification but the designer should give due consideration to the performance of the power
supply when used with a compatible notebook computer.
NOTE Applications for use in aerospace, military, medical, or smart grid are not addressed in this Technical
Specification.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60950-1:2005, Information technology equipment – Safety – Part 1: General
requirements
Amendment 1:2009
Amendment 2:2013
IEC 61076-2-102, Connectors for electronic equipment – Part 2-102: Circular connectors
with assessed quality – Detail specification for plugs and jacks for external low voltage power
supply
IEC 61204:1993, Low-voltage power supply devices, d.c. output – Performance
characteristics
Amendment 1:2001
CISPR 22, Information technology equipment – Radio disturbance characteristics – Limits
and methods of measurement
CISPR 24, Information technology equipment – Immunity characteristics – Limits and
methods of measurement
CISPR 32, Electromagnetic compatibility of multimedia equipment – Emission requirements

– 8 – TS 62700 © IEC:2014(E)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60950-1 as well as
the following apply.
3.1.1
notebook computer
lightweight compactly designed computer with a screen and attached keyboard that is capable
of running on battery power for extended periods of time and is relatively easy to transport
from one location to another by a single individual
3.1.2
DC power supply
adapter
AC adapter
external power supply which provides DC to the notebook computer
3.1.3
DC output connector
connecting body to connect and disconnect the electrical interface between DC power supply
and the notebook computer
3.1.4
DC output plug
male connector of DC output connectors for connecting the DC power supply
3.1.5
identification signal
ID signal
signal which enables communication between a DC power supply to a notebook computer
3.1.6
identification signal connector pin
ID pin
electrical connector pin to transport ID signal
3.2 Abbreviations
AC Alternating Current
CPU Central Processing Unit
EIAJ Electronic Industries Association of Japan
EMC Electromagnetic Compatibility
EMI Electro Magnetic Interference
EUT Equipment Under Test
LPS Limited Power Supply
OEM Original Equipment Manufacturer
PSE Product Safety Electrical appliance and material
SPM Smart Power Management
VCC Voltage at the Common Collector

TS 62700 © IEC:2014(E) – 9 –
4 Electrical specification (performance characteristics)
4.1 AC input rating
The range of AC input rating acceptable by the power supply shall be stated and specified as
(100 to 240) Vrms, 50/60 Hz. Operating tolerance shall be (90 to 264) Vrms at 47 Hz to 63 Hz
to accommodate specific country/regional requirements. No further tolerances shall be
applied.
4.2 Inrush current
The maximum inrush current, from power-on (with power on at any point on the AC sinewave)
and including, but not limited to, three line cycles, shall be less than 220 A. The limit shall be
met at the maximum input voltage and across both cold start (all components at minimum
temperature) and hot start conditions (and after sustained operation at maximum rated power
and ambient temperature).
4.3 DC output load condition and voltage regulation
There are still comments and concerns with respect to the DC output load conditions and
voltage regulations. Informative text is given in Clause E.1.
4.4 DC output ripple and noise
The ripple and noise performance for DC output shall be stated and specified as maximum
600 mV peak-to-peak for steady state, except when no load is attached.
IEC 61204:1993, and its Amendment 1:2001, 3.10 “Periodic and random deviation” is
applicable.
4.5 Output transient response and capacitor load
The transient response at the output terminal and the capacitor load of the power supply shall
be stated. The capacitor load shall be specified as 2 200 μF maximum.
IEC 61204:1993, 3.16 “Transient response to load current changes” is applicable.
4.6 Power supply timing
4.6.1 Turn on delay time
The time taken, after switch-on of the source, for the output voltage to enter the specification
band, shall be stated and specified as less than 3 s maximum under all load conditions.
4.6.2 Hold-up time
The hold-up time shall be stated as more than 10 ms at 110 Vrms/50 Hz.
Note that a reference load should be considered in future work.
4.6.3 Rise time of output voltage
The rise time of output voltage shall be greater than 2 ms and less than 40 ms.
Note that a reference load should be considered in future work.

– 10 – TS 62700 © IEC:2014(E)
4.7 Protection
4.7.1 Over-current protection
There are still comments and concerns with respect to over-current protection. Informative
text is given in Clause E.2.
4.7.2 Short-circuit protection
Short-circuit protection shall comply with IEC 60950-1.
4.8 Over shoot
During power on or power off, the output voltage shall not exceed 21 V peak nor be outside
the regulation requirements for more than 10 ms.
Note that the maximum value shall be verified after further definition of 4.3.
5 DC power supply identification and communication method for notebook
computers
This clause needs further investigation and development and is for information only. The use
of the ID pin should be clearly defined (including pin configuration and communication mode).
This Technical Specification has not addressed any definite method of communication
between the AC adapter and computer, nor has the group yet discussed the scope of the data
to be communicated.
Historically, AC adapters have commonly used mechanical interference of the DC connector
to prevent incompatible combinations of AC adapters and notebook computers. Non-
mechanical electrical methods (digital communication, voltage of the adapter, or analog
reference) are in proprietary use today with some OEMs and work by identifying the AC
adapter to the notebook computer. In general, the identification method is developed by each
individual computer manufacturer and the methods used are different. On the other hand,
there are many PCs and power supplies that do not use any identification protocol.
Further investigation is necessary in order to determine an identification method. To agree to
a data communication protocol, data content and format is a complex task. Measures of
robustness and integrity shall be used to help determine a minimum baseline of
communication and allow for future evolution of this Technical Specification. Questions to
answer are the following.
– Is an ID pin communication mandatory for functionality?
– When should it be acceptable for a computer to reject certain models of AC adapters?
– Which communications standard shall be used?
– What should the system do in the event of a failure of the communication?
– Can a scalable system of both low cost analog and higher function digital approaches be
devised?
– Should the communication be bidirectional, or support networking of multiple devices?
– Which is the minimum information that shall be provided by the AC adapter? Which
obligations does the notebook computer have to the AC adapter?
– What mechanism will allow for OEM specific innovation? To gain acceptance, the
Technical Specification should not exclude innovative or proprietary solutions from
manufacturers.
– What roadmap can be provided for future innovation in the communication method, or
what process can be used for standardizing new data?

TS 62700 © IEC:2014(E) – 11 –
Simple analog methods (such as voltage positioning or presentation of a reference current on
a dedicated pin) may be used to identify a few simple characteristics of the AC adapter (such
as the announcement of the power output capability) to the notebook computer. Digital
communication may be used to communicate more detailed information between the computer
and AC adapter. EMI characteristics, power capabilities, or other details may be
communicated to the computer to identify and even reject the usage of an unqualified AC
adapter.
Health variables (such as reporting an over-temperature of the AC adapter) may require
bidirectional signalling initiated by the AC adapter. Configurability of the AC adapter (for
example, configuring output voltage) will require a read/write capability of the digital data.
Lastly, the communication method may be desired to support proprietary OEM functionality
beyond the scope or imagination of this Technical Specification.
Some typical methods used in notebook computers include
Class 1 ID:
The ID is a simple analog voltage. The adapter output voltage is a DC constant, and the
notebook smart-power management (SPM) may get limited parameters such as voltage,
power level, or even ripple, over-current protection, and over-power protectio
...