The last cars without electronic have been built in the sixties, since that time the electronic devices invade the cars. 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.
Design 1: low cost as possible; Design 2: compromise Cost vs. Efficiency; Design 3: no budget limits (a dream of any design engineer). All 3 design’s concepts must fulfill 95% efficiency and pass true the EMC test in the lab