IEC 62024-2-2008 High frequency inductive components - Electrical characteristics and measuring methods - Part 2 Rated current of inductors for DC to DC convert.pdf

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1、 IEC 62024-2 Edition 1.0 2008-10 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 haute frquence Caractristiques lectriques et mthodes de me

2、sure Partie 2: Courant assign des bobines dinduction pour des convertisseurs continus-continus IEC 62024-2:2008 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized i

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16、nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62024-2 Edition 1.0 2008-10 INTERNATIONAL STANDARD NORME INTERNATIONALE High frequency inductive com

17、ponents Electrical characteristics and measuring methods Part 2: Rated current of inductors for DC to DC converters Composants inductifs haute frquence Caractristiques lectriques et mthodes de mesure Partie 2: Courant assign des bobines dinduction pour des convertisseurs continus-continus INTERNATIO

18、NAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE Q ICS 29.100.10 PRICE CODE CODE PRIX ISBN 2-8318-1031-8 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 62024-2 IEC:2008 CONTENTS FOREWORD.

19、3 1 Scope.5 2 Normative references .5 3 Terms and definitions .5 4 Standard atmospheric conditions6 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 conditions6 5.3 Measurement circuit and calcu

20、lation7 5.4 Attachment jig of inductor8 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 conditions9 6.3 Measurement jig9 6.3.1 Printed-wiring board method9 6.3.2 Lead wire method11 6.4 Measuring method and c

21、alculation 12 6.4.1 Resistance-substitution method.12 6.4.2 Thermo-couple method13 6.5 Quality conformance inspection.14 7 Determination of rated current 14 8 Information to be given in the detail specification14 8.1 Measuring method of DC saturation limited current .14 8.2 Measuring method of tempe

22、rature 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) Exam

23、ple of printed-wiring board for leaded type11 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 circu

24、its.12 62024-2 IEC:2008 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 organiz

25、ation 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

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34、ations 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 Stan

35、dard IEC 62024-2 has been prepared IEC technical committee 51: Magnetic components and ferrite materials. This bilingual version, published in 2009-02, corresponds to the English version. The text of this standard is based on the following documents: FDIS Report on voting 51/937/FDIS 51/941/RVD Full

36、 information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 62024-2 IEC:2008 A list

37、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. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date ind

38、icated 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. 62024-2 IEC:2008 5 HIGH FREQUENCY INDUCTIVE COMPONENTS ELECTRICAL CHARACTERISTICS AND MEA

39、SURING 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 curr

40、ent 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 th

41、e 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

42、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 refe

43、renced 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 telecommunicati

44、on 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 val

45、ue of DC current for which the self-generation heat of the inductor results in temperature rise within the specified value 6 62024-2 IEC:2008 4 Standard atmospheric conditions 4.1 Standard atmospheric conditions for testing Standard atmospheric conditions for testing shall be as follows (see 5.3.1 o

46、f 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

47、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 Whe

48、n 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,

49、 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