The AC component gets blocked by the inductor, now the capacitor C2, which is in parallel with the load filter out the AC component which inductor failed to block. The capacitor C1, which is in parallel with the source, has low reactance towards AC components of the input signal while having high resistance towards the DC component of the input signal, resulting in most of the Ac component of the signal passing through capacitor C1 and the DC component moving towards the inductor of the circuit. Low pass LC pi filter has an inductor in series with the load, and two capacitors, one capacitor in parallel with the source and another capacitor in parallel with the load. The pi filter is used where the high dc output voltage is required on small current drains because of its high voltage gain. Image Credit: “SparkX Pi-Filter” by SparkFunElectronics is licensed under CC BY 2.0 Low pass LC pi filter Cut off frequency(fc) = 1/ᴫ(LC) 1/2 Value of the Capacitance is (C) = 1/Z 0ᴫfc Value of the inductance (L1) = Z 0/ᴫfc Where, the Z 0 is the impedance characteristic in ohms and fc is the cut off frequency. LC pi filter formula For low pass LC pi filter formula: Image: Low Pass LC Pi filter circuit. LC filter is used at high frequency because it can eliminate AC ripples with the highest efficiency than other filters and can provide a smooth DC signal as output. Nowadays, more sensitive circuits, high-speed logic and more electrical noise at the high frequency require highly efficient filtering of noises for proper operations. Why LC filters are used at high frequency LC pi filter can also be known as CLC filter due to its design or components in use. This filter is also known as a capacitor input filter because the output of the rectifier is directly fed into the capacitor, which is connected in parallel with the rectifier. The pi filter is a type of LC passive filter, which is constructed using an inductor and capacitor forming the shape of a greek letter (pie) that’s why it’s known as a pi filter. It can also be used as a high pass filter configuration. The Pi filter is majorly used as a low pass filter, which consists of three components. Image Credit: T type filter, SpinningSpark real life identity: SHA-1 commitment ba62ca25da3fee2f8f36c101994f571c151abee7, Lattice filter, unbalanced T, CC BY-SA 3.0 What is Pi type filter LC filters can be classified by different designs or configurations: An LC filter can be a high pass filter (HPF), low pass filter (LPF) or a bandpass filter (BPF). LC filter circuit is an LC circuit that is used as a filter, which consists of an inductor and capacitor LC filter can cut or pass signal from a certain frequency range. The unique characteristics of the inductor and the capacitor are used to remove noise in a different configuration. This article will discuss about LC PI filter in detail.
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