R1 controls surge currents by limiting the current flow to slow the charging of the capacitor. L-section Resistive FiltersĪn L-section resistive filter is a filter that reduces or eliminates the amount of DC ripple at the output of a circuit by using a resistor and capacitor as an RC time constant.Īn L-section resistive filter reduces surge currents by using a current-limiting resistor (R1). Ripple voltage increases when the load increases on the capacitive filter. If the load resistance is large and the capacitance is large, the ripple voltage will be small, resulting in a smooth output. The amount of discharge between voltage peaks is controlled by the resistor-capacitor (RC) time constant of the capacitor and the load resistance. In a capacitive filter, the ripple voltage is the voltage drop before the capacitor begins to charge again. Ripple voltage is the amount of varying voltage present in a DC power supply. A capacitive filter circuit diagram and output waveform.īetween peaks, the capacitor discharges through the resistive load RL, and the voltage gradually drops. As pulsating DC voltage from a rectifier is applied across capacitor C1, it charges to the peak voltage. Since a large capacitor is needed, an electrolytic capacitor is typically used. The capacitive filter provides a maximum voltage output to a load. A capacitive filter is a circuit consisting of a capacitor and a resistor connected in parallel.
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