ISO TS 7637-4-2020 PDF

Full title and description

St ISO/TS 7637-4:2020 — Road Vehicles — Electrical disturbance by conduction and coupling — Part 4: Electrical transient conduction along shielded high-voltage supply lines only. This Technical Specification defines bench test methods and measurement procedures for evaluating immunity of electrically powered vehicle equipment to conducted transients that propagate along shielded high-voltage supply lines used in modern vehicles (systems >60 V d.c. and <1500 V d.c.). It is intended for components and systems in battery electric, hybrid and plug-in hybrid vehicles whose power supply is isolated from vehicle body.

Abstract

This document specifies test methods and procedures to ensure compatibility to conducted electrical transients along shielded high-voltage supply lines of equipment installed on passenger cars and commercial vehicles fitted with electrical systems with voltages higher than 60 V d.c. and lower than 1 500 V d.c. and a power supply isolated from the vehicle body. It describes bench tests for both injection and measurement of transients and defines relevant waveforms, coupling arrangements and measurement points for Pulse A (pulsed sinusoidal bursts) and Pulse B (low-frequency sinusoidal disturbances), and associated test setups for component-level verification.

General information

• Status: Published (Technical Specification)
• Publication date: May 2020
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 43.040.10 (Electrical and electronic equipment for road vehicles)
• Edition / version: Edition 1 (ISO/TS 7637-4:2020)
• Number of pages: 24 pages (ISO record)

Scope

Applies to electrical and electronic equipment installed on road vehicles that use shielded high-voltage supply lines (nominal DC voltage > 60 V and < 1 500 V) where the power supply is isolated from vehicle body. The specification defines transient waveforms, test levels and test methods for bench-based injection and measurement of electrical transients conducted along shielded HV lines, with the objective of verifying immunity of the equipment under test to switching noise and low-frequency sinusoidal disturbances typical of high-voltage electric propulsion and power-conversion systems.

Key topics and requirements

• Definition of target equipment and applicability for systems between 60 V d.c. and 1 500 V d.c.
• Pulse A — pulsed sinusoidal burst waveforms to simulate high-frequency switching transients (typical frequency range for bursts: ~100 kHz–10 MHz).
• Pulse B — continuous/low-frequency sinusoidal disturbances representing harmonics from drive motors and power converters (typical range: ~3 kHz–300 kHz).
• Test bench configurations for asymmetric and symmetric coupling to shielded HV lines, including coupling networks and balun arrangements where applicable.
• Measurement points, instrumentation requirements and procedures for injection and recording of transient responses.
• Requirements for galvanic isolation, safety and handling of high-voltage test setups.
• Guidance for interpreting test results at component and sub-system level; intended for EMC immunity verification rather than vehicle-level integration testing.

Typical use and users

Used by automotive OEMs, Tier‑1/ Tier‑2 suppliers, electronic module designers, EV powertrain and battery-system engineers, and independent EMC/test laboratories to verify immunity of high-voltage components (inverters, on-board chargers, DC/DC converters, battery management systems, high‑voltage distribution units, traction motors) to conducted transients on shielded HV supply lines. Also used by test-equipment manufacturers to implement compliant generators and coupling hardware.

Related standards

ISO/TS 7637-4 is part of the ISO 7637 series addressing electrical disturbances from conduction and coupling. Closely related documents include ISO 7637-1 (vocabulary and general considerations, updated 2023), ISO 7637-2 (electrical transient conduction along supply lines), ISO 7637-3 (transmission by capacitive and inductive coupling via lines other than supply lines) and ISO/TR/7637-5 (guidance on pulse generator harmonization). Other related automotive EMC and electrical-environment standards include ISO 16750-2 (electrical environment), ISO 11452 series (immunity by radiated and conducted methods) and ISO 10605 (ESD on road vehicles).

Keywords

ISO/TS 7637-4, electrical transients, shielded high-voltage supply lines, automotive EMC, Pulse A, Pulse B, EV, HEV, PHEV, immunity testing, high-voltage systems, bench test methods, coupling networks, transient conduction.

FAQ

Q: What is this standard?

A: ISO/TS 7637-4:2020 is a Technical Specification from ISO that specifies bench test methods and procedures for electrical transient conduction along shielded high-voltage supply lines used in road vehicles.

Q: What does it cover?

A: It covers test waveforms (notably Pulse A and Pulse B), coupling methods, test setups, measurement points and procedures for verifying immunity of equipment powered from shielded HV lines in vehicle systems with nominal DC voltages above 60 V and below 1 500 V.

Q: Who typically uses it?

A: Automotive OEMs, power-electronics and battery module designers, Tier‑1 and Tier‑2 suppliers, and accredited EMC test laboratories that perform high‑voltage conducted transient immunity tests for EV and hybrid vehicle components.

Q: Is it current or superseded?

A: ISO/TS 7637-4 was published in May 2020 (Edition 1). As of March 2, 2026 there is no publicly listed withdrawal or replacement; users should confirm on the ISO catalogue or national standards body for any updates before relying on the standard for certification or contract compliance.

Q: Is it part of a series?

A: Yes — it is part of the ISO 7637 series (Parts 1–5/TR) addressing electrical disturbances from conduction and coupling for road vehicles; Part 4 specifically addresses shielded high-voltage supply lines.

Q: What are the key keywords?

A: electrical transients, shielded high-voltage lines, automotive EMC, Pulse A, Pulse B, immunity testing, EV/HEV/PHEV, coupling networks, high-voltage bench testing.