1、Road vehicles Electrical disturbances from conduction and coupling Part 5: Enhanced definitions and verification methods for harmonization of pulse generators according to ISO 7637 PD ISO/TR 7637-5:2016 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewo
2、rd This Published Document is the UK implementation of ISO/TR 7637-5:2016. The UK participation in its preparation was entrusted to Technical Committee AUE/32, Electrical and electronic components and general system aspects (Road vehicles). A list of organizations represented on this committee can b
3、e obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 91677 9 ICS 43.040.10 Com
4、pliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 November 2016. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD ISO/TR
5、7637-5:2016 ISO 2016 Road vehicles Electrical disturbances from conduction and coupling Part 5: Enhanced definitions and verification methods for harmonization of pulse generators according to ISO 7637 Vhicules routiers Perturbations lectriques par conduction et par couplage Partie 5: Amlioration de
6、s dfinitions et des mthodes de vrification pour lharmonisation des gnrateurs dimpulsions selon la norme ISO 7637 TECHNICAL REPORT ISO/TR 7637-5 Reference number ISO/TR 7637-5:2016(E) First edition 2016-11-01 PD ISO/TR 7637-5:2016 ISO/TR 7637-5:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECT
7、ED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
8、written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org PD IS
9、O/TR 7637-5:2016 ISO/TR 7637-5:2016(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Test pulse generator description 1 4.1 Existing generator description 1 4.2 Test setups for generator verification . 2 4.2.1 General 2 4.2.2 Existing verification setup
10、s 2 4.2.3 Extended verification setups . 4 4.3 Generator verification . 5 4.3.1 General 5 4.3.2 Verification results with existing setup definitions . 6 4.3.3 Verification results with extended setup definitions . 8 4.4 Verification summary Missing generator definitions leading to different results
11、.10 5 Proposal of extended definitions for pulse generators and verification methods .11 5.1 General 11 5.2 Test procedure adaptation .11 5.3 Tolerance definition for generator evaluation 11 5.4 Extended generator definition .11 5.4.1 Decoupling network . 11 5.4.2 Coupling network .12 5.5 Generator
12、models for simulation .13 Annex A (informative) Investigation summary of existing pulse generators14 Bibliography .40 ISO 2016 All rights reserved iii Contents Page PD ISO/TR 7637-5:2016 ISO/TR 7637-5:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation
13、 of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee.
14、International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and thos
15、e intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (s
16、ee www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the doc
17、ument will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms a
18、nd expressions related to conformit y assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html. The committee responsible for this document is ISO/TC 22, Road
19、 vehicles, Subcommittee SC 32, Electrical and electronic components and general system aspects. A list of all parts in the ISO/TR 7637 series can be found on the ISO website.iv ISO 2016 All rights reserved PD ISO/TR 7637-5:2016 ISO/TR 7637-5:2016(E) Introduction Pulses in vehicles are generated by d
20、ifferent switching events of electrical loads connected to the supply system and coupled via the wiring harness to other components or wires. For test purpose, these pulse phenomena are simulated by pulse generators and coupled via coupling structures to the wiring of a device under test. The test p
21、ulses are not real pulses but representatives for the wide range of pulse shapes, amplitudes, source resistances and pulse energy observed in vehicles. The definition of the test pulses and the coupling structures are described in ISO 7637-1, ISO 7637-2 and ISO 7637-3. Based on the standard definiti
22、on, test equipment has been developed and is commercially available. The experience with existing test equipment shows some difficulties in terms of result reproducibility for the same DUT dependent on the used generator, which is caused by different realization of test generators coupling and decou
23、pling networks. The intention of this document is to describe the background for these variances and to define methods for harmonization of different generator behaviour. ISO 2016 All rights reserved v PD ISO/TR 7637-5:2016 Road vehicles Electrical disturbances from conduction and coupling Part 5: E
24、nhanced definitions and verification methods for harmonization of pulse generators according to ISO 7637 1 Scope This document proposes extended definitions for pulse generators and verification methods necessary for harmonization of different generators used for pulse testing in accordance to ISO 7
25、637-2 to ensure the comparability and reproducibility of test results independent on generator types. It presents generator verification results based on current definitions of ISO 7637-2, which shows significant differences depending on the used generator type and explains the technical background
26、of the variances. This document is based on ISO 7637-1, ISO 7637-2 and ISO 7637-3. 2 Normative references There are no normative references in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological data
27、bases 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 device under test DUT one single component or a combination of components as defined to be tested 3.2 groun
28、d plane GP flat conductive surface whose potential is used as a common reference Note 1 to entry: Where applicable, the test voltage should also be referenced to the ground plane. 4 Test pulse generator description 4.1 Existing generator description The main parts of pulse generators are the pulse s
29、haping and coupling networks, (important for generating and applying the test pulses to the DUT) and the decoupling network (important for protecting the connected power supply and effecting the pulse coupling to DUT). A block diagram is shown in Figure 1. TECHNICAL REPORT ISO/TR 7637-5:2016(E) ISO
30、2016 All rights reserved 1 PD ISO/TR 7637-5:2016 ISO/TR 7637-5:2016(E) Key 1 power supply 2 decoupling network 3 pulse shaping and coupling network 4 DUT (or verification load) Figure 1 Pulse generator principle The generator description in the current edition of ISO 7637-2 defines only: “The test p
31、ulse generator shall be capable of producing the open circuit test pulses described in 5.6.1 to 5.6.4 at the maximum value of |U s |. U sshall be adjustable within the limits given in Tables 2 to 6. The timing (t) tolerances and internal resistance (R i ) tolerance shall be 20% unless otherwise spec
32、ified.” Beyond that, only timing diagrams of the open circuit voltage and the internal resistor are defined. 4.2 Test setups for generator verification 4.2.1 General The test setup for generator verification is intended to represent typical load conditions applied to the test generator out of the in
33、finite range of test applications. For the different setups, the test generator is expected to show a linear behaviour without resonance effects, under- or over-swing effects. The setup is defined to evaluate relevant data of the test generator with minimal effect to the tolerance scheme of the comp
34、lete test environment. 4.2.2 Existing verification setups The actual test setup and generator verification procedure are described in ISO 7637-2:2011, Annex C and limits the verification to open and matched termination with resistive load (load resistor equal to generator internal pulse source imped
35、ance) as shown in Table 1 and Figure 2. The verification defines and requires U a= 0 V, open load condition with 10 % magnitude tolerance for pulses 1, 2a, 3a, 3b, 20 % of duration for pulses 1, 2a and 30 % duration for pulses 3a, 3b, matched load condition with 20 % tolerance of magnitude for pulse
36、s 1, 2a, 3a, 3b, 20 % of duration for pulses 1, 2a and 30 % duration for pulses 3a, 3b, matching load resistor with 1 % tolerance.2 ISO 2016 All rights reserved PD ISO/TR 7637-5:2016 ISO/TR 7637-5:2016(E) Table 1 Test pulse 1 parameters Test pulse 1 (Nominal 12 V system) Test pulse 1 V s t r t d No
37、load -100 V 10 V , 2 000 s 400 s 10 load -50 V 10 V 1 500 s 300 s Test pulse 1 (Nominal 24 V system) Test pulse 1 V s t r t d No load -600 V 60 V , 1 000 s 200 s 50 load -300 V 60 V 1 000 s 200 s Key 1 oscilloscope or equivalent 2 voltage probe 3 test pulse generator with internal resistance R i 4 D
38、UT disconnected 5 ground plane 6 ground connection; maximum length for test pulse 3 is 100 mm Figure 2 Generator verification setup In addition, ISO 7637-2:2011, Annex D provides equations for voltage, current and energy calculation of a simple RC discharging network, consisting of a storage capacit
39、or, internal and external resistor. ISO 2016 All rights reserved 3 PD ISO/TR 7637-5:2016 ISO/TR 7637-5:2016(E) With these setup and tolerance definitions, all existing pulse generators can be verified successfully. But the limited definitions and wide tolerances lead to different test results with d
40、ifferent test generators and especially under load conditions as described in 4.3.3 and Annex A. Resonances and nonlinear behaviour of test generators, occurring when a real DUT is connected and powered via the pulse generator, cannot be detected with the existing verification method. Hence, more de
41、tailed definitions of pulse shaping, coupling and decoupling network and an enhanced verification definition are necessary. 4.2.3 Extended verification setups Extended verification setups represent a wider range of application load impedances. These may be expected in real applications and enable to
42、 determine the available power. Based on the existing verification setup, an extended set of termination impedances is defined and the pulses are described with closer tolerances. The following set of verification impedances is defined in Table 2: open load conditions; matched resistor to generator
43、source impedance; low resistive load to simulate applications with high current consumption; resistive-capacitive load, to simulate low power loads (e.g. sensors). This set of termination networks define the relevant values for the frequency spectra of the pulses. Table 2 Generator verification cond
44、ition and load definition Supply Load 1 2a 3a 3b unsupplied U a= 0 V open load defined defined defined defined matched load defined defined defined defined supplied U a= U N open load new tbd tbd matched load new tbd tbd 1 new new 100nF|1k new new 4 ISO 2016 All rights reserved PD ISO/TR 7637-5:2016
45、 ISO/TR 7637-5:2016(E) An enhanced generator verification setup is described in Figure 3. Key 1 oscilloscope or equivalent 2 voltage probe 3 test pulse generator with internal resistance R i 4 verification load 5 ground plane 6 ground connection; max. length for test pulse 3 is 100 mm 7 battery or p
46、ower supply Figure 3 Enhanced generator verification setup 4.3 Generator verification 4.3.1 General The performances of 16 pulse generators, specified for pulse immunity test according to ISO 7637, have been verified in order to check the compliance with the standard and the behaviour under real tes
47、t conditions with supply and typical loads. In the first step, the test setups for generator verification defined in ISO 7637 were used and the compliance with the specification was checked. In the second step, the generator input was connected to a power supply and the pulse generator output was lo
48、aded with different load impedances as given by real devices under test (DUT). In both setups, the pulse waveform and the specified pulse parameters were monitored. ISO 2016 All rights reserved 5 PD ISO/TR 7637-5:2016 ISO/TR 7637-5:2016(E) 4.3.2 Verification results with existing setup definitions F
49、or verification of the compliance with the standardized values, the maximal pulse voltage and the pulse width at three different test levels for pulse 1 were measured and the deviation to the standardized value was evaluated. Table 3 shows the verification results. Table 3 Generator verification result summary pulse 1 Test-pulse Supply U a Load Generator voltage U s Pulse voltage U s (min/max
