The last cars without electronic have been built in the sixties, since that time the electronic devices invade the cars. Started from a simple AM/FM Radio until today where autonomous driving and talking to the driver becomes standard for next generation cars.
However already the in the early sixties the manufacturers was facing EMI (electro-magnetic-interferences) generated from the ignition coils and interfere with radio reception.
The “magic” solution to cancel the noise was to use a rod core inductor to filter those sparks generated RF harmonics.
Later in the nineties, the cell phones boom was the one who made interferences with the audio systems generating unwanted sound.
Today the noise sources is almost impossible to avoid and should be considered already in the early design stage. Therefore, is need to know the harmonics generated and to be filtered close as possible to the noise source. As well, the signals must be immune to interferences to avoid fails at the final EMC testing of the car.
In my presentation, I will consider a 100W buck-boost converter as a noise source and give details about 3 different design concepts using almost the same BOM (bill of material) but different layout to achieve the EMC requirements as well conducted and radiated emissions.
Live Q&A session with the speaker at the end of the presentation.
Presentation: How to select the right ferrite bead for filtering
