A Guide To Power Electronics Design For Off-Battery Automotive (Part 1): EMC And Line Transient Requirements
by Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, May 13 2022
Focus:
All vehicle original equipment manufacturers (OEMs) and most component suppliers to the
OEMs perform tests to verify the electromagnetic compatibility (EMC) of their devices
including conducted, radiated and electrostatic discharge (ESD) immunity. Engineers
developing voltage regulator designs for embedded automotive applications should
understand these requirements. Part 1 of this article series explains the immunity, ESD
and supply-line transient requirements associated with conventional vehicle electrical
systems, both 12 V and 24 V. It begins by identifying the CISPR and ISO standards that
govern immunity performance at the vehicle, component and subassembly levels. It also
calls out internal specifications required by the various automotive OEMs. The article
then delves into the specific test requirements of ISO 16750-2 for power line quality
(including waterfall, cold-crank and load-dump voltage transients), ISO 7637-2 for
electrical transient conduction along supply lines, and ISO 11452 for narrowband RI and
ISO
10605 for ESD immunity.
What you’ll learn:
- How to understand the requirements for conducted, radiated and ESD immunity in automotive electrical systems
- How to understand what immunity standards apply to automotive voltage regulator designs
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