#Pi filter design how to#

The Pi filter is an excellent low pass filter that is much more different than the traditional LC Pi filter. In low pass filter application, Pi filter also called the Capacitor input filter as the capacitor stays across the input side in low pass configuration. The main component of a Pi filter is the capacitor and inductor making it an LC filter. In majority, Pi filters are used for Low pass filter application, but another configuration is also possible. The construction arrangement of all the components creates the shape of the Greek letter Pi (π), thus the name Pi section Filter. Pi Filter is a type of passive filter that consists of mainly three components other than the traditional two-element passive filters.

#Pi filter design how to#

So, let’s get into detail on what these filters are and how to design them. We have already used Pi-Filter in a few of our previous Power supply designs like this 5V 2A SMPS circuit and 12V 1A SMPS Circuit. In this tutorial, we learn another new type of filter called Pi Filter, which is very commonly used in power supply circuit designs. We have already discussed in details about these filters: The active filter uses one or more active components with other passive components while passive filters are solely made using passive components. All these filters can be categorized into two types- Active filters and passive filters. There are many different types of filters used in electronic circuit designs based on the application but the underlying concept of all of them is the same, that is to remove unwanted signals. Filters are commonly used in power and audio electronics to reject unwanted frequencies.