Select the parameters required for the safety capacitor in the switching power supply

The safety capacitors in the switching power supply are believed to be very familiar to everyone, and the safety capacitors are still patrons! Why do you say this? Compared with ordinary capacitors, the safety capacitor does not cause damage to the human body after it fails. There is a guaranteed capacitor. Therefore, the safety capacitor is favored by everyone.

In the switching power supply, the safety capacitor is used for common mode filtering. It is connected between L or ground and N to ground, and filters the common mode signal of L to ground or N to ground. The Y capacitor is usually used symmetrically. Bypass; decoupling; filtering; energy storage. The electromagnetic interference generated by the common mode and differential mode generated can be suppressed according to the operating frequency of the switching power supply, and the safety capacitance can be calculated by the common mode and differential mode suppression inductance parameters.

The quality of the safety capacitor parameter in the switching power supply is generally as large as possible. If the fixed frequency harmonic is removed, it can be calculated by f=L/2π*C. You can choose the appropriate safety capacitor according to the above. Or go to the regular capacitor manufacturer to provide model selection. If you have technical questions, please contact us and we will try our best to solve it for you.