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Introduction to Filter

The output voltage of a rectifier is a pulsating dc voltage, which consists of dc as well as ac components. Due to the presence of ac components, ripple exists in the output voltage. To get a smooth dc output voltage, the ac components must be removed. This is only possible by using filter.
 
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dc output voltage of a filter
 
The most commonly used filters are given below:
  1. Inductor filter
  2. Capacitor filter
  3. Inductor-capacitor filter
  4. π-filter




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