Does the switching frequency harmonic of the BMS control board's DC/DC converter cause excessive conducted interference?

The switching action of a DC/DC converter generates abundant switching frequency harmonics, which can easily lead to excessive conducted interference at the corresponding frequencies. The key to suppression lies in input filtering and layout optimization. A π-type filter should be placed near the input port, using a CMZ series common-mode inductor to suppress common-mode noise, and a high-frequency, low-ESR MLCC capacitor in parallel to filter out differential-mode high-frequency harmonics. Simultaneously, the layout must be optimized to minimize the switching loop area, and the MOSFET and inductor nodes should be tightly wired. Furthermore, adding an RC snubber circuit across the switching transistor can mitigate voltage spikes and reduce the generation of high-frequency harmonics. Targeted filtering and optimized layout can effectively suppress conducted interference caused by switching harmonics.