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 section filter, please visit: Choke Input or L Section Filter.
For more details on rectifier filter, please visit: Rectifier Filter
For more details on various electronics circuit, please visit: It’s All About Electronics.

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