Why should a resistor be added to the filter circuit of the capacitor? |Focus on mid-to-high-end brand capacitor manufacturers

A resistor is also added to the capacitor filter circuit, the purpose of which is to obtain a better filtering effect. In pure capacitor filtering, when the pulsating current arrives, the capacitor is charged quickly, and the voltage and the power supply voltage reach a high point at the same time, and then when the power supply voltage is lower than the current charged voltage of the capacitor, the capacitor is discharged through the load, and the load has a certain resistance, so The discharge is slower (the voltage is gentle), and if the cycle continues, the voltage will tend to be gentle. The problem with this circuit is that due to the fast charging speed, the voltage fluctuates during this stage of charging. However, if a resistor is added to the capacitor filter circuit to form an RC filter, the addition of the resistor makes the capacitor slower when charging, so the voltage is flat. The RC 'Pie' i-type filter combined in the previous two circuits can achieve a better filtering effect.

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