Die Rolle von amperometrischen Kondensatoren in Stromversorgungsschaltungen
Safety-rated capacitors are used in such a way that the failure of the capacitor will not lead to electric shock and will not endanger personal safety. Safety-regulated capacitors are usually used only for filtering in anti-interference circuits.
The discharge of the safety-regulated capacitor is different from the ordinary capacitor. The ordinary capacitor will keep the charge for a long time after the external power supply is disconnected, and if you touch it with your hand, you will be electrocuted, while the safety-regulated capacitor does not have this problem. For safety reasons and EMC considerations, it is generally recommended to add the safety capacitor at the power inlet.
In the AC power supply input, generally need to add three safety capacitors to suppress EMI conducted interference. They are used in the power supply filter to play the role of power supply filtering, respectively, the common mode, differential mode interference to play a filtering role.