High frequency inductive components - Electrical characteristics and measuring methods - Part 2: Rated current of inductors for DC to DC converters (IEC 62024-2:2008)

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 standard 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 standard (no larger than 12 mm × 12 mm footprint approximately). These inductors are typically used in DC to DC converters built on PCB, 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 (IEC 62024-2:2008)

Composants inductifs à haute fréquence - Caractéristiques électriques et méthodes de mesure - Partie 2: Courant assigné des bobines d’induction des convertisseurs continus-continus (IEC 62024-2:2008)

La CEI 62024-2:2008 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 valeurs nominales permettent aux utilisateurs de comparer précisément les valeurs nominales courantes figurant dans les différents recueils de données fabricants. La présente norme s'applique aux bobines d'induction à sorties et pour montage en surface dont les dimensions sont conformes à la CEI 62025-1 et dont généralement le courant assigné est inférieur à 22 A, même si des bobines d'induction de courant assigné supérieur à 22 A sont disponibles et s'intègrent dans les restrictions de dimensions de cette norme (empreinte ne dépassant pas 12 mm x 12 mm, approximativement). Ces bobines d'induction sont typiquement utilisées dans des convertisseurs continus-continus 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.

Visokofrekvenčni induktivni sestavni deli - Električne karakteristike in merilne metode - 2. del: Odvisni tok tuljav za DC/DC presmernik (IEC 62024-2:2008)

General Information

Status
Published
Publication Date
22-Feb-2009
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Feb-2009
Due Date
16-Apr-2009
Completion Date
23-Feb-2009

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Induktive Hochfrequenz-Bauelemente - Elektrische Eigenschaften und Messmethoden - Teil 2: Bemessungsstrom von Drosselspulen für DC/DC-Wandler (IEC 62024-2:2008)Composants inductifs à haute fréquence - Caractéristiques électriques et méthodes de mesure - Partie 2: Courant assigné des bobines d’induction des convertisseurs continus-continus (IEC 62024-2:2008)High frequency inductive components - Electrical characteristics and measuring methods - Part 2: Rated current of inductors for DC to DC converters (IEC 62024-2:2008)29.100.10Magnetne komponenteMagnetic componentsICS:Ta slovenski standard je istoveten z:EN 62024-2:2009SIST EN 62024-2:2009en01-april-2009SIST EN 62024-2:2009SLOVENSKI

STANDARD
SIST EN 62024-2:2009
EUROPEAN STANDARD EN 62024-2 NORME EUROPÉENNE
EUROPÄISCHE NORM January 2009

CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC -

All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62024-2:2009 E
ICS 29.100.10
English version
High frequency inductive components -
Electrical characteristics and measuring methods -
Part 2: Rated current of inductors for DC to DC converters (IEC 62024-2:2008)
Composants inductifs à haute fréquence - Caractéristiques électriques
et méthodes de mesure -
Partie 2: Courant assigné
des bobines d’induction
des convertisseurs continus-continus (CEI 62024-2:2008)
Induktive Hochfrequenz-Bauelemente -
Elektrische Eigenschaften
und Messmethoden -
Teil 2: Bemessungsstrom
von Drosselspulen für DC/DC-Wandler (IEC 62024-2:2008)

This European Standard was approved by CENELEC on 2008-12-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

SIST EN 62024-2:2009
EN 62024-2:2009
- 2 -

Foreword The text of document 51/937/FDIS, future edition 1 of IEC 62024-2, prepared by IEC TC 51, Magnetic components and ferrite materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62024-2 on 2008-12-01. The following dates were fixed: – latest date by which the EN has to be implemented

at national level by publication of an identical
national standard or by endorsement
(dop)
2009-09-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)

2011-12-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 62024-2:2008 was approved by CENELEC as a European Standard without any modification. __________

SIST EN 62024-2:2009
- 3 - EN 62024-2:2009 Annex ZA
(normative)

Normative references to international publications with their corresponding European publications

The following referenced documents are indispensable for the application 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

When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

Publication Year Title EN/HD Year
IEC 60068-1 -1) Environmental testing -
Part 1: General and guidance EN 60068-1 19942)
IEC 62025-1 -1) High frequency inductive components -
Non-electrical characteristics and measuring methods -

Part 1: Fixed, surface mounted inductors for use in electronic and telecommunication equipment EN 62025-1 20072)

1) Undated reference. 2) Valid edition at date of issue. SIST EN 62024-2:2009
SIST EN 62024-2:2009
IEC 62024-2Edition 1.0 2008-10INTERNATIONAL STANDARD

High frequency inductive components – Electrical characteristics and measuring methods –

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

INTERNATIONAL ELECTROTECHNICAL COMMISSION PICS 29.100.10 PRICE CODEISBN 2-8318-1003-7

® Registered trademark of the International Electrotechnical Commission SIST EN 62024-2:2009

– 2 – 62024-2 © IEC:2008(E) 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 Measurement circuit and 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 Measurement jig......................................................................................................9 6.3.1 Printed-wiring board method........................................................................9 6.3.2 Lead wire method......................................................................................11 6.4 Measuring method and calculation........................................................................12 6.4.1 Resistance-substitution method.................................................................12 6.4.2 Thermo-couple method..............................................................................13 6.5 Quality conformance inspection.............................................................................14 7 Determination of rated current........................................................................................14 8 Information to be given in the detail specification............................................................14 8.1 Measuring method of DC saturation limited current...............................................14 8.2 Measuring method of temperature rise limited current...........................................15 Annex A (informative)

Example of recommended description on product specification sheets and catalogues..........................................................................................................16

Figure 1 – Inductance measurement circuit under application of DC saturation condition.................................................................................................................................7 Figure 2a) – Example of printed-wiring board for SMD type..................................................10 Figure 2b) – Example of printed-wiring board for leaded type................................................11 Figure 2 – Example of printed-wiring board...........................................................................11 Figure 3 – Temperature rise measurement circuit by resistance substitution method.............12 Figure 4 – Temperature rise measurement circuit by thermo-couple method.........................13

Table 1 – Width of circuits......................................................................................................9 Table 2 – Wire size of circuits...............................................................................................12

SIST EN 62024-2:2009

62024-2 © IEC:2008(E) – 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 the 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 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 and ferrite materials. The text of this standard is based on the following documents: FDIS Report on voting 51/937/FDIS 51/941/RVD

Full information on the voting for the approval of this standard 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. A list of all parts of IEC 62024 series, under the general title High frequency inductive components – Electrical characteristics and measuring methods, can be found on the IEC website. SIST EN 62024-2:2009

– 4 – 62024-2 © IEC:2008(E) The committee has decided that the contents of this publication will remain unchanged until the maintenance result 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

• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended. A bilingual version of this publication may be issued at a later date.

SIST EN 62024-2:2009
62024-2 © IEC:2008(E) – 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 standard 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 standard (no larger than 12 mm × 12 mm footprint approximately). These inductors are typically used in DC to DC converters built on PCB, 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 referenced documents are indispensable for the application 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, 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. 3.1

DC saturation limited current allowable value of DC current for which the decrease of the inductance is within the specified value 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 SIST EN 62024-2:2009

– 6 – 62024-2 © IEC:2008(E) 4 Standard atmospheric conditions 4.1 Standard atmospheric conditions for testing Standard atmospheric conditions for testing shall be as follows (see 5.3.1 of IEC 60068-1): – 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 5.2 of IEC 60068-1 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 results from the peak current of the superposition of AC on DC current. In this standard, the saturation current is measured as DC current offsetting a small signal AC current. NOTE It is not practical to set a standard for AC saturation limited current, because there are an unlimited number of different ways to apply AC current in an application. Therefore, manufacturers and users have generally defined DC saturation limited current as a common point of reference. This standard does the same. 5.2 Test conditions Unless otherwise specified in the detail specification, the test conditions shall be in accordance with Clause 4. NOTE The variation of the value of DC saturation lim

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