How to Effectively Protect the Power Port of an Infusion Pump from Conducted Interference and Surges?

The power port is the primary entry path for transient pulses generated by grid fluctuations and the startup/shutdown of high-power equipment. Protection requires a multi-stage strategy. At the AC input, varistors or dedicated lightning protection modules should be used as the first stage of coarse protection to absorb high-energy lightning surges and switching transients. Following this, a π-type or LC filter network should be deployed to suppress low-frequency conducted interference. For critical internal DC power rails, such as 24V or 5V buses, it is necessary to use common-mode chokes at the power entry point to filter out common-mode noise, and pair them with TVS diodes that have precise clamping voltages to provide overvoltage protection for downstream precision circuits.