DC power supply filtering principle and introduction Circuit principle The signal obtained after the AC signal passes through the rectification circuit (half-wave, full-wave and bridge rectification) is a DC signal, but this DC signal is a pulsating DC and cannot be used as a stable DC power supply for the circuit. Therefore, the rectified signal needs to pass through the filtering circuit to obtain a stable DC signal. Here, capacitors are used to achieve the filtering effect. The filtering effect of the filtering circuit is related to the load, input signal and filter capacitor value. The larger the load, the larger the filter capacitor needs to be to obtain a stable DC power supply. The following figure 1 is a filter circuit formed by a full-wave rectifier circuit and a filter capacitor sealed at the load end.
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