It's All About Electronics

Capacitor Input or π Filter and R-C Filter Definition: A filter is a device or process that removes some unwanted components or features from a signal. Rectifier filter is an electronic circuit that removes ripple or unwanted AC signal components from the output of a Rectifier. We have already discussed about series inductor filter and shunt capacitor filter in my previous post. Practical filter circuits are derived by combining these two type of filter. One of the most commonly used combinations are capacitor input or π filter.  Capacitor input filter consists of shunt capacitor C1 at the input followed by series inductor L and shunt capacitor C 2 across the load. The later ( series inductor L and shunt capacitor C2 across the load ) makes the L Section Filter. I have already discussed about L Section Filter in my previous post. Major part of filtering is accomplished by  the input capacitor C1 . Most of the remaining ripple is removed by the L Section ...

Choke Input or L Section Filter Definition: A filter is a device or process that removes some unwanted components or features from a signal. Rectifier filter is an electronic circuit that removes ripple or unwanted AC signal components from the output of a Rectifier. We have already discussed about series inductor filter and shunt capacitor filter in my previous post. Practical filter circuits are derived by combining these two types of filter. One of the most commonly used combinations are choke input or L section filter. Choke input filter consists of choke L connected in series with the rectifier and a capacitor C across the load. The choke L allows DC to pass but opposes the flow of AC components as its dc resistance is negligibly small but ac impedance is large. Any AC components in the current even after passing through the choke are largely bypassed around the load by the shunt capacitor because Xc is smaller than R . For more details on choke input or L sect...

Shunt Capacitor Filter Definition: A filter is a device or process that removes some unwanted components or features from a signal. Rectifier filter is an electronic circuit that removes ripple or unwanted AC signal components from the output of a Rectifier. The main question is, “Why we use capacitor as a filter for rectifier circuit?” The reason is, one of the important property of capacitor is, it pass the AC signal but blocks the DC signal. Now what is the meaning of that? The reactance of capacitor is X=1/jwC ( w →angular frequency, C →capacitance of capacitor). For DC signal, w=0, so, X →infinite (theoretically). For AC signal, let’s assume, w = w1 . So, X=1/jw1C . Now if w1 is large, X will be small, then impedance will be low. So, AC signal will pass through the capacitor but not DC signal. This the reason we use Capacitor Filter for Rectifier circuit. For more details on Shunt Capacitor Filter, please visit: Shunt Capacitor Filter . Before study, Shunt Ca...