SIST EN 61248-4:2002

Transformers and inductors for use in electronic and telecommunication equipment -- Part 4: Sectional specification for power transformers for switched mode power supplies (SMPS) on the basis of the capability approval procedure

Specifies how to prepare detail specifications for SMPS power transformers. Includes a blank detail specification, which shows the format, and indicates which tests are considered to be appropriate to this type of component.

Transformatoren und Drosseln für elektronische und nachrichtentechnische Einrichtungen -- Teil 4: Rahmenspezifikation für Leistungstransformatoren für Schaltnetzteile (SMPS) mit Befähigungsanerkennung

Transformateurs et inductances destinés aux équipements électroniques et de télécommunications -- Partie 4: Spécification intermédiaire pour les transformateurs de puissance pour alimentations à découpage (SMPS) sur la base de la procédure de l'agrément de savoir-faire

Spécifie comment préparer les spécifications particulières pour les transformateurs de puissance pour alimentations à découpage. Comprend une spécification particulière cadre, qui montre la présentation et indique les essais appropriés à considérer pour ce type de composant.

Transformers and inductors for use in telecommunication and electronic equipment - Part 4: Sectional specification for power transformers for switched mode power supplies (SMPS) on the basis of the capability approval procedure (IEC 61248-4:1996)

General Information

• Status: Published
• Publication Date: 31-Aug-2002
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2002
• Due Date: 01-Sep-2002
• Completion Date: 01-Sep-2002
• Ref Project: EN 61248-4:1997 - Transformers and inductors for use in electronic and telecommunication equipment - Part 4: Sectional specification for power transformers for switched mode power supplies (SMPS) on the basis of the capability approval procedure

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61248-4:2002
01-september-2002
Transformers and inductors for use in telecommunication and electronic
equipment - Part 4: Sectional specification for power transformers for switched
mode power supplies (SMPS) on the basis of the capability approval procedure
(IEC 61248-4:1996)
Transformers and inductors for use in electronic and telecommunication equipment --
Part 4: Sectional specification for power transformers for switched mode power supplies
(SMPS) on the basis of the capability approval procedure
Transformatoren und Drosseln für elektronische und nachrichtentechnische
Einrichtungen -- Teil 4: Rahmenspezifikation für Leistungstransformatoren für
Schaltnetzteile (SMPS) mit Befähigungsanerkennung
Transformateurs et inductances destinés aux équipements électroniques et de
télécommunications -- Partie 4: Spécification intermédiaire pour les transformateurs de
puissance pour alimentations à découpage (SMPS) sur la base de la procédure de
l'agrément de savoir-faire
Ta slovenski standard je istoveten z: EN 61248-4:1997
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 61248-4:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61248-4:2002

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SIST EN 61248-4:2002

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SIST EN 61248-4:2002

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SIST EN 61248-4:2002

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SIST EN 61248-4:2002

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SIST EN 61248-4:2002
NORME CEI
INTERNATIONALE IEC
1248-4
INTERNATIONAL
QC 260300
STAN DARD
Première édition
First edition
1996-06
Transformateurs et inductances destinés
aux équipements électroniques et de
télécommunications –
Partie 4:
Spécification intermédiaire pour les
transformateurs de puissance pour alimentations
à découpage (SMPS) sur la base de la procédure
de l'agrément de savoir-faire
Transformers and inductors for use in electronic
and telecommunication equipment –
Part 4:
Sectional specification for power transformers
for switched mode power supplies (SMPS) on
the basis of the capability approval procedure
CEI 1996 Droits de reproduction réservés — Copyright — all rights reserved
©
Aucune partie de cette publication ne peut étre reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
cédé, électronique ou mécanique, y compris la photocopie et including photocopying and microfilm, without permission
les microfilms, sans raccord écrit de l'éditeur. in writing from the publisher.
Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève, Suisse
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission
PRICE CODE S
IEC
Mericuytapogriae 3neKrporexHHVecKasa KOMHCCHc
Pour prix, voir catalogue en vigueur •
•
For price, see current catalogue

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SIST EN 61248-4:2002
1248-4 © IEC:1996 - 3 -
CONTENTS
Page
FOREWORD 5
Clause
7
1 Scope
7 2 Normative references
9
Preparation of the detail specification
3
11 3.1 General
11
3.2 Ratings and characteristics
13 3.3 Outline drawings and winding schematic diagram
13
3.4 Information essential for correct system operation
13 Inspection requirements to be listed in the detail specification
4
13
4.1 Conformance inspection
13
4.2 Design verification
15
Detail specification 5
Blank detail specification 17
29
Annex A - Measurement of no-load loss

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SIST EN 61248-4:2002
1248-4 © I EC:1996 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
TRANSFORMERS AND INDUCTORS FOR USE IN ELECTRONIC
AND TELECOMMUNICATION EQUIPMENT —
Part 4: Sectional specification for power transformers for
switched mode power supplies (SMPS)
on the basis of the capability approval procedure
FOREWORD
The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
1)
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
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. The IEC
collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
The formal decisions or agreements of the IEC on technical matters express as nearly as possible an
2)
international consensus of opinion on the relevant subjects since each technical committee has
representation from all interested National Committees.
The documents produced have the form of recommendations for international use and are published in the
3)
form of standards, technical reports or guides and they are accepted by the National Committees in that
sense.
In order to promote international unification, IEC National Committees undertake to apply IEC International
4)
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
5)
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 1248-4 has been prepared by IEC technical committee 51:
Magnetic components and ferrite materials.
This standard is intended for use in the IEC Quality Assessment System for Electronic
Components (IECQ).
The operation of the IECQ is governed by IEC QC 001001 and IEC QC 001002. Specifi-
cations written for components assessed under this scheme, and their use in the scheme,
are the subject of IEC Guide 102.
The text of this standard is based on the following documents:
FDIS Report on voting
51 /430/RV D
51/401/FDIS
Full information on the voting for the approval of this standard can be found in the report
on voting indicated in the above table.
The QC number that appears on the front cover of this publication is the specification
number in the IECQ System.
Annex A forms an integral part of this standard.

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SIST EN 61248-4:2002
1248-4 ©IEC:1996 – 7 –
TRANSFORMERS AND INDUCTORS FOR USE IN ELECTRONIC
AND TELECOMMUNICATION EQUIPMENT —
Part 4: Sectional specification for power transformers for
switched mode power supplies (SMPS)
on the basis of the capability approval procedure
1 Scope
of IEC 1248 specifies how to prepare detail specifications for SMPS power trans-
This part
formers to be released under the terms of IEC 1248-1 (QC 260000) capability approval. It
includes a blank detail specification (BDS), which shows the format and indicates which
tests are considered to be appropriate to this type of component, although the final
selection of tests to be included in the inspection schedule is at the discretion of the
specification writer. It also lists appropriate ratings and characteristics.
of IEC 1248 are used for the transfer of power in
The components covered by this part
conjunction with semi-conductor devices working in a switched mode where the input
waveform is sinusoidal or non-sinusoidal, symmetrical or asymmetrical.
2 Normative references
The following normative documents contain provisions, which, through reference in this
of IEC 1248. At the time of publication, the editions
text, constitute provisions of this pa rt
indicated were valid. All normative documents are subject to revision, and parties to
of IEC 1248 are encouraged to investigate the possibility of
agreements based on this pa rt
applying the most recent editions of the normative documents listed below. Members of
IEC and ISO maintain registers of currently valid International Standards.
Electronic components – Specification structures for quality assess-
IEC Guide 102: 1989,
ment (Qualification approval and capability approval)
Basic rules of the IEC Quality Assessment System for Electronic
IEC QC 001001: 1986,
Components (IECQ)
Amendment 2 (1994)
Rules of procedure of the IEC Quality Assessment System for
IEC QC 001002: 1986,
Electronic Components (IECQ)
Amendment 2 (1994)
IEC QC 001004: Specifications list
ices approved under the IECQ
rv
IEC QC 001005: Register of firms, products and se
System, including ISO 9000
Environmental testing – Part 2: Tests
IEC 68-2:

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SIST EN 61248-4:2002
1248-4 ©IEC:1996 - 9 -
IEC 68-2-6: 1982, Environmental testing - Part 2: Tests - Test Fc and guidance: Vibration
(sinusoidal)
IEC 68-2-20: 1979, Environmental testing - Part 2: Tests - Test T: Soldering
Amendment 2 (1987)
IEC 68-2-21: 1983, Environmental testing - Part 2: Tests - Test U: Robustness of ter-
minations and integral mounting devices
Amendment 2 (1991), Amendment 3 (1992)
Environmental testing - Part 2: Tests - Test Ea and guidance: Shock
IEC 68-2-27: 1987,
IEC 68-2-29: 1987, Environmental testing - Part 2: Tests - Test Eb and guidance: Bump
IEC 317-4: 1990, Specifications for different types of winding wires - Part 4: Solderable
polyurethane enamelled round copper wires, class 130
IEC 367-1: 1982, Cores for inductors and transformers for telecommunications - Part 1:
Measuring methods
IEC 410: 1973, Sampling plans and procedures for inspection by attributes
IEC 1007: 1994, Transformers and inductors for use in electronic and telecommunication
equipment - Measuring methods and test procedures
IEC 1248-1: 1996, Transformers and inductors for use in electronic and telecommunication
equipment - Part 1: Generic specification
ISO 128: 1982, Technical drawings - General principles of presentation
ISO 129: 1985, Technical drawings - Dimensioning - General principles, definitions,
methods of execution and special indications
3 Preparation of the detail specification
This standard is intended to be used for the preparation of detail specifications for SMPS
power transformers released under the terms of IEC 1248-1 (QC 260000) capability
approval procedure.
It is intended for use by the following originators:
a) a customer wishing to procure SMPS power transformers that are within the scope
of the approved capability of his supplying component manufacturer, for example for
detail specifications (DS);
a capability approved manufacturer of SMPS power transformers wishing to prepare
b)
specifications for his own products which are within the scope of his capability
approval.
NOTES
1 The detail specification should take the form of the BDS shown in clause 5, particularly in respect of
the front page format and, in principle, in respect of the presentation of the inspection requirements.
2 Unless otherwise specified, all the tests shown in the BDS, with the exception of the no-load loss test
given in annex A, are taken from IEC 1007. Those shown underlined concern operating characteristics of
fundamental importance, and it is strongly recommended that these are selected by the specification writer.

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SIST EN 61248-4:2002
1248-4 ©IEC:1996 – 11 –
for inclusion in the detail specification. The tests shown in plain type are listed for the convenience of the
specification writer, and tests should be selected from them according to the particular application of the
component.
The specification writer may specify tests and sampling levels different from, less than, or additional to
3
those given in the BDS.
3.1 General
3.1.1 Where additional tests of a type not defined or invoked in this specification or
IEC 1007 are required, these shall be fully specified in the detail specification.
3.1.2 Any tests considered as being destructive shall be so denoted in the test schedule
by the addition of the notation "(D)".
NOTE – The use of this notation is not illustrated in the BDS.
3.1.3 Tests shall be grouped in the schedule according to the level of sampling required
and, unless otherwise indicated (see 4.1 b)), in the order of testing required. Where 100 %
testing is not required, inspection levels and acceptable quality levels shall be selected
from IEC 410.
3.1.4 The completed detail specification shall be allocated a component identity number
and issue status by the originator.
NOTES
This number is chosen by the originator (manufacturer or customer) within his own system. It is thus
1
not subject to any external rules or codification.
2 In the special case of a manufacturer's detail specification for a standard catalogue item which the
manufacturer wishes to be listed in IEC QC 001004, the national committee will allocate an appropriate
number from its register.
3.1.5 A number allocated by the component manufacturer shall be additionally included
in the detail specification comprising this specification number, his factory identification
code letters, and a unique number within his registration system, for example
QC 260300/PQR/1234.
NOTE – After a detail specification has been allocated the manufacturer's reference number in
accordance with 3.1.5, it is to be considered a contractual part of the order. Copies of all such detail specifi-
cations are to be retained by the manufacturer's chief inspector.
Ratings and characteristics
3.2
3.2.1 Ratings
In the case of customer-originated detail specifications, customer and manufacturer
agreement shall be obtained on the ratings to be ascribed to the component in the detail
specification. These ratings shall not exceed the scope of the manufacturer's capability
approval (see also 1.12 of IEC 1248-1).

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SIST EN 61248-4:2002
1248-4 © I EC:1996 - 13 -
3.2.2 Characteristics
A customer shall prescribe in the detail specification any characteristic required for a
component.
Outline drawings and winding schematic diagram
3.3
3.3.1 The detail specification shall incorporate a drawing of the transformer showing
impo rtant features, such as those dimensions affecting interchangeability, restrictions on
mounting, and marking requirements.
3.3.2 The detail specification shall incorporate a schematic diagram showing all
windings, screens, taps and phasings, and giving termination identification.
Information essential for correct system operation
3.4
3.4.1 Tolerances shall be given where applicable.
3.4.2 The type of drive and output, together with the required output and load character-
istics, shall be specified in an annex attached to the detail specification.
NOTE — This information is essential since the design of this component is intimately bound up with the
configuration and characteristics of the circuit in which it is incorporated.
4 Inspection requirements to be listed in the detail specification
4.1 Conformance inspection
The detail specification shall incorporate the following notes:
sampling inspections shall be carried out in accordance with IEC 410, normal
a)
inspection;
tests in a group may be carried out in any order, except where otherwise indicated
b)
(see 3.1.3);
components submitted to any tests marked (D) may not be released under IEC 1248-1
c)
capability approval (D = destructive);
the values given for measurement limits are absolute values: measurement un-
d)
certainty is to be taken into account.
4.2 Design verification
The tests to be detailed under this heading are those which the specification writer con-
siders to be inappropriate to lot-by-lot release, but appropriate to the verification of new
and original designs. Accordingly, they are to be performed only when specifically so
stated in the order, and the detail specification shall carry a statement to this effect.

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SIST EN 61248-4:2002
1248-4 ©I EC:1996 – 15 –
If design verification is required, the number of specimens and the requirement that there
shall be no failures shall be stated in the detail specification.
NOTE — Two specimens should normally be provided, unless otherwise stated.
5 Detail specification
The BDS which follows, when completed in accordance with clause 3, shall form the rele-
vant detail specification.
NOTE — The front page of the BDS has been based upon the need for a customer's detail specification.
Where a manufacturer's detail specification is required, some changes will be necessary, but the basic for-
mat should be retained.

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