The selection methods of the safety-regulated capacitors are as follows.
(1) Withstand voltage selection.
x-type stabilized capacitors are divided into X1, X2 and X3 according to the withstand voltage. The permissible peak pulse voltage super potential level in the safety level of stabilized capacitors: 2.5kV<X1≤4.0kV, X2≤2.5kV, X3≤1.2kV.
Select different voltage withstand values of stabilizing capacitors according to the circuit, not too large or too small, x capacitors mostly choose X2 capacitors.
(2) Certification type
No matter what category of electronic devices, is to be formal must have verification, safety certification also contains commodity safety verification, environmental certification, power energy verification, different countries have different electrical safety requirements, some require a ccc certification, verification there are many, such as China’s CQC certification, France’s VDE certification, the United States UL certification, the EU countries ENEC verification, Japan’s KC verification, etc. . The selection of safety capacitor case should be based on different places not the same in our country to select different verification of electronic devices.