What key points should be considered when selecting protection solutions for the power system of anesthesia machines?

The anesthesia machine power supply system features multiple levels coexisting, requiring graded protection settings. At the main AC power inlet, varistors or power surge protection modules should be used to form the first-level coarse protection, absorbing high-energy surges from the grid. On internal DC power buses, such as 24V or 12V rails, fast-response TVS diodes must be selected for secondary clamping protection to suppress internal switching noise and coupled transient voltages. During component selection, the clamping voltage of the TVS must be lower than the maximum withstand voltage of the downstream circuitry, and its power rating should be capable of absorbing the expected surge energy. Additionally, attention must be paid to the layout of protection devices, ensuring coordination with fuses, filter capacitors, and other components to form an effective filtering and energy discharge network.