CAPACITANCE FILTERS these are nothing
more than large capacitors
across the output of the rectifier section. Because of the large size of the
capacitors, fast charge paths, and slow discharge paths, the capacitor will
charge to average value, which will keep the pulsating DC output from
reaching zero volts.
INDUCTOR FILTERS - uses an inductor called a choke to filter the pulsating DC
input. Because of the impedance offered to circuit current, the output of the
filter is at a lower amplitude than the input.
PI-TYPE FILTERS - uses capacitive and inductive filters connected in a pi-type
configuration. By combining filtering devices, the ability of the pi filter to
remove ripple voltage is superior to that of either the capacitance or inductance
23 June 2005