What is the working principle of the filter capacitor? |Focus on mid-to-high-end brand capacitor manufacturers

Filter capacitor refers to a kind of energy storage device installed at both ends of the rectifier circuit to reduce the ripple coefficient of AC pulsation and improve the smooth DC output. Since the filter circuit requires a large capacity for the energy storage capacitor, most of the filter capacitors are electrolytic capacitors, and electrolytic capacitors are named because they use electrolyte as the electrode (negative electrode). We know that the capacitor has a characteristic: it can pass through and block the DC, it allows the AC component to pass and cuts off the DC component. The filter capacitor uses the principle of charge and discharge, which is reflected in that the voltage across the capacitor cannot change suddenly, making the pulse waveform from steep to flat. As long as the pulse is dense enough (the frequency is high enough) and the capacity of the filter capacitor is large enough, the DC voltage obtained will become relatively stable. However, large-capacity capacitors have large internal inductance and poor high-frequency characteristics, so a small-capacity capacitor must be used in parallel.

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