The role of amperometric capacitors in power supply circuits
Sikkerhedskondensatorer anvendes på en sådan måde, at et svigt i kondensatoren ikke fører til elektrisk stød og ikke bringer den personlige sikkerhed i fare. Sikkerhedsregulerede kondensatorer bruges normalt kun til filtrering i anti-interferens kredsløb.
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.