High frequency inductive components - Electrical characteristics and measuring methods - Part 2: Rated current of inductors for DC to DC converters

This part of IEC 62024 specifies the measuring methods of the rated direct current limits for
small inductors.
Standardized measuring methods for the determination of ratings enable users to accurately
compare the current ratings given in various manufacturers’ data books.
This document is applicable to leaded and surface mount inductors with dimensions according
to IEC 62025-1 and generally with rated current less than 22 A, although inductors with rated
current greater than 22 A are available that fall within the dimension restrictions of this
document (no larger than a 12 mm × 12 mm footprint approximately). These inductors are
typically used in DC-to-DC converters built on PCBs, for electric and telecommunication
equipment, and small size switching power supply units.
The measuring methods are defined by the saturation and temperature rise limitations
induced solely by direct current.

Induktive Hochfrequenz-Bauelemente - Elektrische Eigenschaften und Messmethoden - Teil 2: Bemessungsstrom von Drosselspulen für DC/DC-Wandler

Composants inductifs à haute fréquence - Caractéristiques électriques et méthodes de mesure - Partie 2: Courant assigné des bobines d'induction pour des convertisseurs continus-continus

IEC 62024-2:2020 est disponible sous forme de IEC 62024-2:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 62024-2:2020 spécifie les méthodes de mesure des limites de courant continu assigné pour de petites bobines d'induction. Les méthodes de mesure normalisées pour la détermination des caractéristiques assignées permettent aux utilisateurs de comparer avec précision les caractéristiques assignées courantes figurant dans les différents recueils de données fabricants. Le présent document s'applique aux bobines d'induction à sorties et pour montage en surface dont les dimensions sont conformes à l'IEC 62025-1 et dont le courant assigné est généralement inférieur à 22 A, même si des bobines d'induction de courant assigné supérieur à 22 A sont disponibles et respectent les restrictions de dimensions de ce document (empreinte ne dépassant pas environ 12 mm x 12 mm). Ces bobines d'induction sont habituellement utilisées dans des convertisseurs continu-continu montés sur des cartes à circuit imprimé (CCI), pour des matériels électriques et de télécommunications, ainsi que pour des unités d'alimentation de puissance de commutation de petite taille. Les méthodes de mesure sont définies par les limites de saturation et d'échauffement induites uniquement par le courant continu. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - ajout du Tableau 2 et de la Figure 2 b).

Visokofrekvenčne induktivne komponente - Električne karakteristike in merilne metode - 2. del: Naznačeni tok tuljav za presmernik DC/DC

General Information

Status
Published
Publication Date
03-May-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
15-Apr-2021
Due Date
20-Jun-2021
Completion Date
04-May-2021

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SLOVENSKI STANDARD
SIST EN IEC 62024-2:2021
01-junij-2021
Nadomešča:
SIST EN 62024-2:2009
Visokofrekvenčne induktivne komponente - Električne karakteristike in merilne
metode - 2. del: Naznačeni tok tuljav za presmernik DC/DC

High frequency inductive components - Electrical characteristics and measuring methods

- Part 2: Rated current of inductors for DC to DC converters

Induktive Hochfrequenz-Bauelemente - Elektrische Eigenschaften und Messmethoden -

Teil 2: Bemessungsstrom von Drosselspulen für DC/DC-Wandler

Composants inductifs à haute fréquence - Caractéristiques électriques et méthodes de

mesure - Partie 2: Courant assigné des bobines d'induction pour des convertisseurs

continus-continus
Ta slovenski standard je istoveten z: EN IEC 62024-2:2020
ICS:
29.100.10 Magnetne komponente Magnetic components
SIST EN IEC 62024-2:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62024-2:2021
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SIST EN IEC 62024-2:2021
EUROPEAN STANDARD EN IEC 62024-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 29.100.10 Supersedes EN 62024-2:2009 and all of its amendments
and corrigenda (if any)
English Version
High frequency inductive components - Electrical characteristics
and measuring methods - Part 2: Rated current of inductors for
DC-to-DC converters
(IEC 62024-2:2020)

Composants inductifs à haute fréquence - Caractéristiques Induktive Hochfrequenz-Bauelemente - Elektrische

électriques et méthodes de mesure - Partie 2: Courant Eigenschaften und Messmethoden - Teil 2:

assigné des bobines d'induction pour des convertisseurs Bemessungsstrom von Drosselspulen für DC/DC-Wandler

continu-continu (IEC 62024-2:2020)
(IEC 62024-2:2020)

This European Standard was approved by CENELEC on 2020-05-05. 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,

Turkey 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

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62024-2:2020 E
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SIST EN IEC 62024-2:2021
EN IEC 62024-2:2020 (E)
European foreword

The text of document 51/1303/CDV, future edition 2 of IEC 62024-2, prepared by IEC/TC 51

"Magnetic components, ferrite and magnetic powder materials" was submitted to the IEC-CENELEC

parallel vote and approved by CENELEC as EN IEC 62024-2:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-02-05

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-05-05

document have to be withdrawn

This document supersedes EN 62024-2:2009 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.

Endorsement notice

The text of the International Standard IEC 62024-2:2020 was approved by CENELEC as a European

Standard without any modification.
---------------------- Page: 4 ----------------------
SIST EN IEC 62024-2:2021
EN IEC 62024-2:2020 (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 60068-1 2013 Environmental testing - Part 1: General and EN 60068-1 2014
guidance
IEC 62025-1 - High frequency inductive components - Non- EN 62025-1 -
electrical characteristics and measuring methods -
Part 1: Fixed, surface mounted inductors for use in
electronic and telecommunication equipment
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SIST EN IEC 62024-2:2021
---------------------- Page: 6 ----------------------
SIST EN IEC 62024-2:2021
IEC 62024-2
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High frequency inductive components – Electrical characteristics and
measuring methods –
Part 2: Rated current of inductors for DC-to-DC converters
Composants inductifs à haute fréquence – Caractéristiques électriques et
méthodes de mesure –
Partie 2: Courant assigné des bobines d'induction pour des convertisseurs
continu-continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-7995-3

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
---------------------- Page: 7 ----------------------
SIST EN IEC 62024-2:2021
– 2 – IEC 62024-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Standard atmospheric conditions ..................................................................................... 6

4.1 Standard atmospheric conditions for testing ............................................................ 6

4.2 Reference conditions .............................................................................................. 6

5 Measuring method of DC saturation limited current .......................................................... 6

5.1 General ................................................................................................................... 6

5.2 Test conditions ....................................................................................................... 6

5.3 Measuring circuit and calculation ............................................................................ 7

5.3.1 Measuring circuit ............................................................................................. 7

5.3.2 Calculation ...................................................................................................... 7

5.4 Attachment jig of inductor ....................................................................................... 8

5.5 Measuring method .................................................................................................. 8

5.6 Quality conformance inspection .............................................................................. 8

6 Measuring method of temperature rise limited current...................................................... 8

6.1 General ................................................................................................................... 8

6.2 Test conditions ....................................................................................................... 9

6.3 Measuring jig .......................................................................................................... 9

6.3.1 General ........................................................................................................... 9

6.3.2 Printed-wiring board method ............................................................................ 9

6.3.3 Lead wire method .......................................................................................... 12

6.4 Measuring method and calculation ........................................................................ 12

6.4.1 General ......................................................................................................... 12

6.4.2 Resistance substitution method ..................................................................... 12

6.4.3 Thermo-couple method .................................................................................. 14

6.5 Quality conformance inspection ............................................................................ 15

7 Determination of rated current ....................................................................................... 15

8 Information to be given in the detail specification ........................................................... 15

8.1 General ................................................................................................................. 15

8.2 Measuring method of DC saturation limited current ............................................... 15

8.3 Measuring method of temperature rise limited current ........................................... 15

Annex A (informative) Example of recommended description on product specification

sheets and catalogues .......................................................................................................... 16

Bibliography .......................................................................................................................... 17

Figure 1 – Inductance measuring circuit under application of DC saturation condition ............ 7

Figure 2 – Example of printed-wiring boards ......................................................................... 12

Figure 3 – Temperature rise measuring circuit by resistance substitution method ................ 13

Figure 4 – Temperature rise measuring circuit by thermo-couple method .............................. 14

Table 1 – Width of circuits ...................................................................................................... 9

Table 2 – Circuit pattern width and thickness ........................................................................ 10

Table 3 – Wire size of circuits ............................................................................................... 12

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SIST EN IEC 62024-2:2021
IEC 62024-2:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH FREQUENCY INDUCTIVE COMPONENTS –
ELECTRICAL CHARACTERISTICS AND MEASURING METHODS –
Part 2: Rated current of inductors for DC-to-DC converters
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

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62024-2 has been prepared IEC technical committee 51: Magnetic

components, ferrite and magnetic powder materials.

This second edition cancels and replaces the first edition published in 2008. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) addition of Table 2 and Figure 2 b).
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1303/CDV 51/1325/RVC
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SIST EN IEC 62024-2:2021
– 4 – IEC 62024-2:2020 © IEC 2020

Full information on the voting for the approval of this International Standard 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.

A list of all parts of IEC 62024 series, published under the general title High frequency

inductive components – Electrical characteristics and measuring methods can be found on the

IEC website.

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.
---------------------- Page: 10 ----------------------
SIST EN IEC 62024-2:2021
IEC 62024-2:2020 © IEC 2020 – 5 –
HIGH FREQUENCY INDUCTIVE COMPONENTS –
ELECTRICAL CHARACTERISTICS AND MEASURING METHODS –
Part 2: Rated current of inductors for DC-to-DC converters
1 Scope

This part of IEC 62024 specifies the measuring methods of the rated direct current limits for

small inductors.

Standardized measuring methods for the determination of ratings enable users to accurately

compare the current ratings given in various manufacturers’ data books.

This document is applicable to leaded and surface mount inductors with dimensions according

to IEC 62025-1 and generally with rated current less than 22 A, although inductors with rated

current greater than 22 A are available that fall within the dimension restrictions of this

document (no larger than a 12 mm × 12 mm footprint approximately). These inductors are

typically used in DC-to-DC converters built on PCBs, for electric and telecommunication

equipment, and small size switching power supply units.

The measuring methods are defined by the saturation and temperature rise limitations

induced solely by direct current.
2 Normative references

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.
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance

IEC 62025-1, High frequency inductive components – Non-electrical characteristics and

measuring methods – Part 1: Fixed, surface mounted inductors for use in electronic and

telecommunication equipment
3 Terms and definitions
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
DC saturation limited current

allowable value of DC current for which the decrease of the inductance is within the specified

value
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SIST EN IEC 62024-2:2021
– 6 – IEC 62024-2:2020 © IEC 2020
3.2
temperature rise limited current

allowable value of DC current for which the self-generation heat of the inductor results in

temperature rise within the specified value
4 Standard atmospheric conditions
4.1 Standard atmospheric conditions for testing

Standard atmospheric conditions for testing shall be as follows (see IEC 60068-1:2013, 4.3):

– temperature: 15 °C to 35 °C;
– relative humidity: 25 % to 75 %;
– air pressure: 86 kPa to 106 kPa.

In the event of dispute or where required, the measurements shall be repeated using the

referee temperatures and such other conditions as given in 4.2.
4.2 Reference conditions

For reference purposes, one of the standard atmospheric conditions for referee tests taken

from IEC 60068-1:2013, 4.2, shall be selected and shall be as follows:
– temperature: 20 °C ± 2 °C;
– relative humidity: 60 % to 70 %;
– air pressure: 86 kPa to 106 kPa.
5 Measuring method of DC saturation limited current
5.1 General

When alternating current in which DC current is superimposed is supplied to an inductor, the

inductance of the inductor decreases according to the DC current value.
In a typical application, the saturation current
...

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