Why should a filter capacitor be added to the power supply? |Focus on mid-to-high-end brand capacitor manufacturers

The ideal power supply is a constant voltage power supply. The outlet of this power supply does not need to be filtered, but there is a big gap between ideal and reality. The main purpose of the filter capacitor in the power circuit is to make the output DC voltage smoother, charging the capacitor at the peak of the pulsating DC, and discharging the load at the trough, so that one input and one output achieves the role of a filter capacitor. In general, our conventional practice is to use large and small capacitors in parallel, large capacitors filter out low-frequency pulsation components, and small capacitors filter high-frequency interference signals. The filter capacitor can reduce the AC impedance of the power supply. In reality, the power supply always has internal resistance, and adding a filter capacitor to the output end of the power supply can instantly increase the current. A larger part of these instantaneous currents do not need to pass through the internal resistance of the power supply, but are directly exchanged on the capacitor, so the AC impedance of the power supply can be reduced.

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