1、High frequency inductivecomponents Electricalcharacteristics and measuringmethods Part 2: Rated current of inductors for DC to DCconvertersBS EN 62024-2:2009raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsNational forewordThis Bri
2、tish Standard is the UK implementation of EN 62024-2:2009. It isidentical to IEC 62024-2:2008.The UK participation in its preparation was entrusted to Technical CommitteeEPL/51, Transformers, inductors, magnetic components and ferrite materials.A list of organizations represented on this committee c
3、an be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 57267 8ICS 29.100.10BRITISH STANDARDBS EN 62024-2:2009Compliance with a British Standard cannot
4、confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on Amendments issued since publicationAmd. No. Date Text affectedMarch31 2009EUROPEAN STANDARD EN 62024-2 NORME EUROPENNE EUROPISCHE NORM January 2009 CENELEC E
5、uropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr 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 f
6、or 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 haute frquence - Caractristiques le
7、ctriques et mthodes de mesure - Partie 2: Courant assign des bobines dinduction des convertisseurs continus-continus (CEI 62024-2:2008) Induktive Hochfrequenz-Bauelemente - Elektrische Eigenschaften und Messmethoden - Teil 2: Bemessungsstrom von Drosselspulen fr DC/DC-Wandler (IEC 62024-2:2008) This
8、 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 refe
9、rences 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
10、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, Icel
11、and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 62024-2:2009 - 2 - Foreword The text of document 51/937/FDIS, future edition 1 of IEC 62024-2, prepared by IEC TC 5
12、1, 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 o
13、r 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
14、without any modification. _ - 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 c
15、ited 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)E
16、nvironmental 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 r
17、eference. 2)Valid edition at date of issue. 2 62024-2 IEC:2008(E) CONTENTS FOREWORD.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 lim
18、ited current.6 5.1 General .6 5.2 Test conditions6 5.3 Measurement circuit and calculation7 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.
19、3.1 Printed-wiring board method9 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 method13 6.5 Quality conformance inspection.14 7 Determination of rated current 14 8 Information to be given in the detail specification14 8
20、.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
21、condition.7 Figure 2a) Example of printed-wiring board for SMD type 10 Figure 2b) Example 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 cir
22、cuit by thermo-couple method .13 Table 1 Width of circuits 9 Table 2 Wire size of circuits .12 BS EN 62024-2:200962024-2 IEC:2008(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ HIGH FREQUENCY INDUCTIVE COMPONENTS ELECTRICAL CHARACTERISTICS AND MEASURING METHODS Part 2: Rated current of inductors f
23、or 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 concer
24、ning 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
25、 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 clo
26、sely 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 relev
27、ant 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 t
28、echnical 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
29、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 fo
30、r 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 commit
31、tees 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 Publication
32、s. 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
33、 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 5
34、1/937/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 ti
35、tle High frequency inductive components Electrical characteristics and measuring methods, can be found on the IEC website. BS 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
36、 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. BS EN 62024-2:200962024-2 IEC:2
37、008(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 metho
38、ds 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 i
39、nductors 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 sma
40、ll 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 th
41、e 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 Par
42、t 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 i
43、s 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 BS EN 62024-2:2009 6 62024-2 IEC:2008(E) 4 Standard atmospheric conditions 4.1 Standard atmospheri
44、c 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 re
45、feree 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 %;
46、 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 saturat
47、ion 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 nu
48、mber 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 cond
49、itions shall be in accordance with Clause 4. NOTE The variation of the value of DC saturation limited current, as a function of temperature, is dependent on the magnetic material and the structure of the magnetic core of the inductor. However, measurement of DC saturating currents at elevated temperatures is generally not practical for inspection purposes. Therefore, the measurement at room temperature as provided by this standard i
