1、BRITISH STANDARD BS EN 61248-4:1997 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 The European Standar
2、d EN61248-4:1997 has the status of a BritishStandard ICS 29.180BSEN61248-4:1997 This BritishStandard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15November1997 BSI 04-2000 ISBN 0 580 28
3、432 8 National foreword This BritishStandard is the English language version of EN61248-4:1997. It is identical with IEC61248-4:1996. The UK participation in its preparation was entrusted to Technical Committee EPL/51, Transformers, inductors, magnetic components and ferrite materials, which has the
4、 responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the U
5、K. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one n
6、umbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications
7、. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard do
8、es not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an ins
9、ide front cover, pagesi andii, theEN title page, pages2 to17 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date Comm
10、entsBSEN61248-4:1997 BSI 04-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61248-4 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61248-4 August 1997 ICS 29.180 Descriptors: Power transformers for switched mode power supplies (SMPS), sectional specific
11、ation, capability approval, preparation of the detail specification, inspection requirements, detail specification English version Transformers and inductors for use in electronic and telecommunication equipment Part4: Sectional specification for power transformers for switched mode power supplies (
12、SMPS) on the basis of the capability approval procedure (IEC 61248-4:1996) Transformateurs et inductances destins aux quipements lectroniques et de tlcommunications Partie 4: Spcification intermdiaire pour les transformateurs de puissance pour alimentations dcoupage (SMPS) sur la base de la procdure
13、 de lagrment de savoir-faire (CEI 61248-4:1996) Transformatoren und Drosseln fr elektronische und nachrichtentechnische Einrichtungen Teil 4: Rahmenspezifikation fr Leistungstransformatoren fr Schaltnetzteile (SMPS) mit Befhigungsanerkennung (IEC 61248-4:1996) This European Standard was approved by
14、CENELEC on1997-07-01. 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 stan
15、dards 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 not
16、ified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland a
17、nd United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any
18、means reserved worldwide for CENELEC members. Ref. No. EN 61248-4:1997 EEN61248-4:1997 BSI 04-2000 2 Foreword The text of the International Standard IEC61248-4:1996, prepared by IEC TC51, Magnetic components and ferrite materials, was submitted to the Unique Acceptance Procedure and was approved by
19、CENELEC as EN61248-4 on1997-07-01 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A and Annex ZA are normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International
20、Standard IEC61248-4:1996 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of the detail specification 3 3.1 General 4 3.2 Ratings and characteristics 4 3.3 Outline drawings and winding schematic diagram
21、 4 3.4 Information essential for correct system operation 4 4 Inspection requirements to be listed in the detail specification 4 4.1 Conformance inspection 4 4.2 Design verification 4 5 Detail specification 5 Blank detail specification 5 Annex A (normative) Measurement of no-load loss 11 Annex ZA (n
22、ormative) Normative references to international publications with their corresponding European publications 16 Figure A.1 Bridge circuit for no-load loss measurement 11 Figure A.2 Multiplying voltmeter method of measuring no-load loss 13 Figure A.3 Oscilioscope method of measuring no-load loss 14 la
23、test date by which the ENhas to be implemented at national level by publication of an identical national standard or by endorsement (dop)1998-06-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow)1998-06-01EN61248-4:1997 BSI 04-2000 3 1 Scope This part of
24、 IEC1248 specifies how to prepare detail specifications for SMPS power transformers to be released under the terms of IEC1248-1 (QC260000) capability approval. It includes a blank detail specification (BDS), which shows the format and indicates which tests are considered to be appropriate to this ty
25、pe 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. The components covered by this part of IEC1248 are used for the transfer of power in conjunction w
26、ith 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 text, constitute provisions of this part of IEC12
27、48. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC1248 are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. Memb
28、ers of IEC and ISO maintain registers of currently valid International Standards. IEC Guide 102:1989, Electronic components Specification structures for quality assessment (Qualification approval and capability approval). IEC QC 001001:1986, Basic rules of the IEC Quality Assessment System for Elect
29、ronic Components (IECQ). Amendment 2 (1994) IEC QC001002:1986, Rules of procedure of the IEC Quality Assessment System for Electronic Components (IECQ). Amendment 2 (1994) IEC QC 001004, Specifications list. IEC QC001005:, Register of firms, products and services approved under the IECQ System, incl
30、uding ISO9000. IEC 68-2, Environmental testing Part 2: Tests. IEC 68-2-6:1982, Environmental testing Part2:Tests Test Fc and guidance: Vibration (sinusoidal). IEC 68-2-20:1979, Environmental testing Part2:Tests Test T: Soldering. Amendment 2 (1987) IEC 68-2-21:1983, Environmental testing Part2:Tests
31、 Test U: Robustness of terminations and integral mounting devices. Amendment 2 (1991), Amendment 3 (1992) IEC 68-2-27:1987, Environmental testing Part2:Tests Test Ea and guidance: Shock. IEC 68-2-29:1987, Environmental testing Part2:Tests Test Eb and guidance: Bump. IEC 317-4:1990, Specifications fo
32、r different types of winding wires Part4: Solderable polyurethane enamelled round copper wires, class130. IEC 367-1:1982, Cores for inductors and transformers for telecommunications Part1:Measuring methods. IEC 410:1973, Sampling plans and procedures for inspection by attributes. IEC 1007:1994, Tran
33、sformers 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 Part1: Generic specification. ISO 128:1982, Technical drawings General principles of p
34、resentation. 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 u
35、nder the terms of IEC1248-1 (QC260000) 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 spe
36、cifications (DS); b) a capability approved manufacturer of SMPS power transformers wishing to prepare specifications for his own products which are within the scope of his capability approval. NOTE 1The detail specification should take the form of the BDS shown in clause5, particularly in respect of
37、 the front page format and, in principle, in respect of the presentation of the inspection requirements.EN61248-4:1997 4 BSI 04-2000 NOTE 2Unless 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 IEC1007. Those shown und
38、erlined concern operating characteristics of fundamental importance, and it is strongly recommended that these are selected by the specification writer for inclusion in the detail specification. The tests shown in plain type are listed for the convenience of the specification writer, and tests shoul
39、d be selected from them according to the particular application of the component. NOTE 3The specification writer may specify tests and sampling levels different from, less than, or additional to those given in the BDS. 3.1 General 3.1.1 Where additional tests of a type not defined or invoked in this
40、 specification or IEC1007 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)”. NOTEThe use of this notation is not illustrated in the BDS. 3.1.3 Tests
41、shall be grouped in the schedule according to the level of sampling required and, unless otherwise indicated see4.1 b), in the order of testing required. Where100% testing is not required, inspection levels and acceptable quality levels shall be selected from IEC410. 3.1.4 The completed detail speci
42、fication shall be allocated a component identity number and issue status by the originator. NOTE 1This number is chosen by the originator (manufacturer or customer) within his own system. It is thus not subject to any external rules or codification. NOTE 2In the special case of a manufacturers detai
43、l specification for a standard catalogue item which the manufacturer wishes to be listed in IEC QC001004, 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 c
44、omprising this specification number, his factory identification code letters, and a unique number within his registration system, for example QC260300/PQR/1234. NOTEAfter a detail specification has been allocated the manufacturers reference number in accordance with3.1.5, it is to be considered a co
45、ntractual part of the order. Copies of all such detail specifications are to be retained by the manufacturers chief inspector. 3.2 Ratings and characteristics 3.2.1 Ratings In the case of customer-originated detail specifications, customer and manufacturer agreement shall be obtained on the ratings
46、to be ascribed to the component in the detail specification. These ratings shall not exceed the scope of the manufacturers capability approval (seealso1.12 of IEC1248-1). 3.2.2 Characteristics A customer shall prescribe in the detail specification any characteristic required for a component. 3.3 Out
47、line drawings and winding schematic diagram 3.3.1 The detail specification shall incorporate a drawing of the transformer showing important features, such as those dimensions affecting interchangeability, restrictions on mounting, and marking requirements. 3.3.2 The detail specification shall incorp
48、orate a schematic diagram showing all windings, screens, taps and phasings, and giving termination identification. 3.4 Information essential for correct system operation 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 c
49、haracteristics, shall be specified in an annex attached to the detail specification. NOTEThis 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: a) sampling inspections shall be carried out in accordance with IEC410, normal inspection; b) tests
