Battery supply simulation

Apart from EMC testing such as transient testing on vehicle battery supply lines and RF conducted and radiated immunity, battery supply simulation for electrical loads connected to the 12 V, 24 V or future 42 V supply is becoming more and more important. Vehicle manufacturers specifically do a large number of such tests exceeding by far what ISO 16750-2 requires. Looking at vehicle manufacturers' specifications there are a large number of additional tests like micro-interruptions, dips and drops, all with considerable fast rise and fall times, voltage variations, over voltage and under voltage tests and reverse voltage tests. With each edition of manufacturers' specifications it is possible that you could find some modified or new test requirements. Looking at such extensive requirements, it is obvious that manufacturer's consider battery supply simulation to be at least as important as transient testing to ensure proper, save and reliable function of all parts and systems in a vehicle. We will give an overview of such requirements and make cross references between international standards and manufacturer requirements.