FILTER CIRCUIT

FILTER CIRCUIT

1. A filter circuit is a device which removes the a.c. component of rectifier output but allows the d.c. component to reach the load.

   • filter circuit should be installed between the rectifier and the load
     • A filter circuit is generally a combination of inductors (L) and capacitors (C)
       • • A capacitor passes a.c. readily but does not pass d.c. at all.
         • An inductor opposes a.c. but allows d.c. to pass through it.
         • Types of Filter circuits
           • capacitor filter
             • It consists of a capacitor C placed across the rectifier output in parallel with load RL.
           • choke input filter
             • It consists of a choke L connected in series with the rectifier output and a filter capacitor C across the load.
           • capacitor input filter or π-filter
             • It consists of a filter capacitor C1 connected across the rectifier output, a choke L in series andanother filter capacitor C2 connected across the load.

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