National foreword

This British Standard is the UK implementation of ISO 21780:2020.

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 be obtained on request to its committee manager.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2020.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation 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. 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 those 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 (see www.iso.org/directives).

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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32, Electrical and electronic equipment and general system aspects.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

1 Scope

This document covers requirements and tests for the electric and electronic components in road vehicles equipped with an electrical system operating at a nominal voltage of 48 V DC.

This includes the following:

general requirements on 48 V DC electrical systems;
voltage ranges;
slow voltage transients and fluctuations (not including EMC).

2 Normative references

3 Terms and definitions

4 Functional status

4.1 General

4.2 Functional status 1 (FS1)

4.3 Functional status 2 (FS2)

4.4 Functional status 3 (FS3)

4.5 Functional status 4 (FS4)

4.6 Functional status 5 (FS5)

5 Supply voltage range

6 Functional categories

7 Operating modes

8 General tests conditions

8.1 Standard tolerances

8.2 General values

8.3 Sampling rate and value resolution

8.4 Description of interfaces

8.5 Restrictions on performing the tests

8.6 Number of tested samples

8.7 Test voltages

8.8 Test procedure

8.9 Parameter check

8.10 Continuous parameter monitoring with drift analysis

8.11 Physical analysis

9 General requirements

9.1 General

9.2 Prerequisites regarding the system in which the component is applied

9.3 Component requirements

10 Tests and requirements

10.1 Test-01: nominal voltage range

10.2 Test-02: lower and upper transitory voltage ranges

10.3 Test-03: short term overvoltage

10.4 Test-04: supply component load dump control test

10.5 Test-05: starting profile

10.6 Test-06: long term overvoltage

10.7 Test-07: overvoltage with consumer components which may supply electrical energy

10.8 Test-08: decrease and increase of supply voltage

10.9 Test-09: voltage ripples

10.10 Test-10: reinitialisation

10.11 Test-11: discontinuities in supply voltage

10.12 Test-12: ground loss

10.13 Test-13: fault current

10.14 Test-14: ground offset

10.15 Test-15: short circuit in signal line and load circuit

10.16 Test-16: quiescent current

BS ISO 21780:2020

Road vehicles. Supply voltage of 48 V. Electrical requirements and tests

Current, Under Review

Published:

31 Aug 2020