The filter inductor is generally made of a ferrite material

The filter inductor is generally made of a ferrite material, which can be easily combined with a feedthrough capacitor to form a composite filter. In a high performance filter, a wound inductor is also used. However, it should be noted that ferrite materials undergo magnetic saturation at high currents, reducing filter performance.
Commonly used filter circuits are passive filtering and active filtering. The main forms of passive filtering are capacitive filtering, inductive filtering and complex filtering (including inverted L-type, LC filtering, LCπ-type filtering and RCπ-type filtering, etc.). The main form of active filtering is active RC filtering, also known as electronic filters. The magnitude of the pulsating component in the direct current is represented by a pulsation coefficient. The larger the value, the worse the filtering effect of the filter.
The RC-π filter circuit is essentially composed of a RC filter circuit based on the capacitor filter. The function of the resistor R is to drop the residual ripple voltage across the resistor and finally bypass it by C2. . In the case where the value of ω is constant, the larger the R is, the larger the C2 is, the smaller the pulsation coefficient is, that is, the better the filtering effect is. When the value of R increases, the DC voltage drop across the resistor will increase, which increases the internal loss of the DC power supply; if the capacitance of C2 is increased, the volume and weight of the capacitor will increase, and the implementation will not be realized. reality. This type of circuit is generally used in applications where the load current is relatively small.

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