ISO 21782-4:2021

Electrically propelled road vehicles - Test specification for electric propulsion components - Part 4: Performance testing of the DC/DC converter

This document specifies performance tests and each evaluation for the DC/DC converter in the voltage class B electric propulsion system of electrically propelled road vehicles.

Véhicules à propulsion electrique — Spécification d'essai pour les composants de propulsion électrique — Partie 4: Essais de performance pour le convertisseur DC/DC

General Information

• Status: Published
• Publication Date: 16-May-2021
• ICS: 43.120 - Electric road vehicles
• Technical Committee: ISO/TC 22/SC 37 - Electrically propelled vehicles
• Drafting Committee: ISO/TC 22/SC 37/WG 4 - Systems and components connected to electric propulsion systems
• Current Stage: 6060 - International Standard published
• Start Date: 17-May-2021
• Due Date: 11-Dec-2021
• Completion Date: 17-May-2021

Overview

ISO 21782-4:2021 - Electrically propelled road vehicles - Test specification for electric propulsion components - Part 4: Performance testing of the DC/DC converter - defines standardized performance tests for DC/DC converters used in voltage class B electric propulsion systems. The standard specifies test objectives, diagrams, operating points, environmental and cooling conditions, measurement procedures and the required test report format to verify converter loss, efficiency and thermal behaviour.

Key topics and requirements

• Scope and context
  • Applies to DC/DC converters in voltage class B propulsion systems; uses definitions and ambient/test-condition references from ISO 21782-1:2019 and voltage sub-classing in ISO 21498-1.
• Measurement of loss and efficiency
  • Test setup and diagram for DUT, supply, load and power meters.
  • Operating points defined in Annex B (p1…p18) cover combinations of output currents (0.2×I to I) and input voltages (maximum, rated, minimum) for long (1 800 s) and short (2 or 10 s) durations.
  • Record averages of input and output power (averaged over the last 1 s of each operating time).
  • Loss and efficiency are calculated from measured input and output power (efficiency = output power / input power × 100%).
• Temperature rise (thermal) test
  • Test diagram with temperature measurement points and thermometers.
  • Measure temperature at power-semiconductor/electrode parts and at coolant/air inlet and outlet (liquid or air cooling).
  • Recommended coolant temperature is 65 °C where technically feasible; coolant examples: ethylene or propylene glycol.
• Test conditions and reporting
  • Ambient conditions per ISO 21782-1; specified coolant flow/air flow minimums.
  • Test report content and templates provided in Annex A (common conditions, measured values, calculated results).

Applications

• Performance validation of automotive DC/DC converters during design verification and production acceptance.
• Thermal design verification and cooling-system validation for converters in electric vehicles (EVs).
• Supplier qualification, component characterization, and laboratory certification tests.
• Benchmarking efficiency and loss maps for system-level energy management and range optimization.

Who should use this standard

• EV OEMs, powertrain and electronics engineers
• DC/DC converter manufacturers and suppliers
• Independent test laboratories and certification bodies
• R&D teams focused on converter efficiency and thermal reliability

Related standards

• ISO 21782-1:2019 - General test conditions and definitions
• ISO 21498-1 - Specification of voltage sub-classes for voltage class B

Keywords: ISO 21782-4:2021, DC/DC converter, electrically propelled road vehicles, performance testing, efficiency, temperature rise, voltage class B, test specification, operating points, loss measurement.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 21782-4
First edition
2021-05
Electrically propelled road vehicles —
Test specification for electric
propulsion components —
Part 4:
Performance testing of the DC/DC
converter
Véhicules à propulsion electrique — Spécification d'essai pour les
composants de propulsion électrique —
Partie 4: Essais de performance pour le convertisseur DC/DC
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 1
5 Tests . 1
5.1 Measurement of loss and efficiency . 1
5.1.1 General. 1
5.1.2 Test diagram . 1
5.1.3 Test conditions. 2
5.1.4 Test procedure . 3
5.2 Temperature rise test . 3
5.2.1 General. 3
5.2.2 Test diagram . 3
5.2.3 Test conditions. 4
5.2.4 Test procedure . 5
6 Test report . 5
Annex A (informative) Test report . 6
Annex B (normative) Operating points . 8
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).
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 document 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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 37,
Electrically propelled vehicles.
A list of all parts in the ISO 21782 series can be found on the ISO website.
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.
iv © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 21782-4:2021(E)
Electrically propelled road vehicles — Test specification
for electric propulsion components —
Part 4:
Performance testing of the DC/DC converter
1 Scope
This document specifies performance tests and each evaluation for the DC/DC converter in the voltage
class B electric propulsion system of electrically propelled road vehicles.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 21782-1:2019, Electrically propelled road vehicles — Test specification for electric propulsion
components — Part 1: General test conditions and definitions
ISO 21498-1, Electrically propelled road vehicles — Specification of voltage sub-classes for voltage class B
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21782-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in ISO 21782-1 apply.
5 Tests
5.1 Measurement of loss and efficiency
5.1.1 General
The purpose of this test is to operate the DC/DC converter under the specified conditions and to
measure the loss and the efficiency of the
...