The ripple factor (r) is an indication of the effectiveness of the filter and is defined as The output frequency of a full-wave rectifier is twice that of a half-wave rectifier.įig 2 : Comparison of ripple voltages for half-wave and full-wave rectified voltages with the same filter capacitor and load and derived from the same sinusoidal input voltage. The capacitor discharges less during the shorter interval between full-wave pulses, as shown in Figure 2.įig 1 : The period of a full-wave rectified voltage is half that of a half-wave rectified voltage. When filtered, the full-wave rectified voltage has a smaller ripple than does a half-wave voltage for the same load resistance and capacitor values. This makes a full-wave rectifier easier to filter because of the shorter time between peaks. Generally, ripple is undesirable thus, the smaller the ripple, the better the filtering action, as illustrated in Below Figure.įig : Half-wave ripple voltage (blue line).įor a given input frequency, the output frequency of a full-wave rectifier is twice that of a half-wave rectifier, as illustrated in Figure 1.
The variation in the capacitor voltage due to the charging and discharging is called the ripple voltage. Ripple Voltage As you have seen, the capacitor quickly charges at the beginning of a cycle and slowly discharges through RL after the positive peak of the input voltage (when the diode is reverse-biased).
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