Pi Filter Circuit Diagram. A pi filter is a shunt capacitor filter followed by an lc filter which is arranged like the greek letter π hence it is called a pi filter. The below fig shows a typical capacitor input filter or π filter.
This circuit is designed with two filter capacitors namely c1 and c2 and a choke mentioned with l. π filter or capacitance input filter. These three components are arranged in the form of greek letter pi.
It has capacitor at its input and hence it is also called as a capacitor input filter.
The pi filter gives steadier and smoother dc compared to other filters. It consists of a filter capacitor c 1 connected across the rectifier output a choke l in series and another filter capacitor c 2 connected across the load. The pi filter gives steadier and smoother dc compared to other filters. The shunt capacitor c1 does the main filtering.
