Does the conflict between multiple power supply grounding on the BMS control board lead to excessive conducted interference?

Improper grounding in multi-power supply systems can lead to grounding conflicts and excessive conducted interference. Return currents from each power supply interfere with each other on a common path, creating ground noise voltage. This noise may modulate at the power supply ports, resulting in excessive conducted interference. The solution is to adopt a star grounding or zoned grounding strategy. This involves converging the power grounds of each power module at a single point at the input capacitor. Digital ground and analog ground are connected at a single point using a ferrite bead or a 0-ohm resistor. It also ensures that high-current and low-current ground paths are separated, reducing common impedance coupling. A clear, low-noise grounding system is fundamental for managing complex power networks and reducing conducted interference.