This document discusses different types of passive filters that can be used for rectifier output, including shunt capacitor filters, choke input (LC) filters, and Pi (π) filters. It provides information on the characteristics, advantages, and disadvantages of each filter type. Shunt capacitor filters are low cost but draw more current. Choke input filters have reduced ripples at the output but are bulky. Pi filters provide more output voltage and less ripple but are larger in size and higher cost.

1. RECTIFIER OUTPUT
TYPES
 Many types of passive filters are in use
• Shunt capacitor filter
• Chock input (LC) filter
• Pi(π) filter or CLC filter or capacitor input filter

2. CAPACITOR FILTER
XC = 1/2πfC
If frequency = 0
XC becomes ἀ

3. ADVANTAGES
DISADVANTAGE
• Low cost
 Capacitor draws more
current size and weight
• Small
• Good characteristics
• Can be connected for both HW and FW
rectifiers
• Improved d.c output

4. CHOKE INPUT FILTER
XL = 2πfL
If frequency = 0
XL becomes 0

5. OUTPUT

6. ADVANTAGES
DISADVANTAGE
••
••
•
Low output voltage the output
Reduced ripples at
Bulky andindependent of load current
Action is large in size
Not suit to connect with HWR

7. π - FILTER OR CLC FILTER
 XC = 1/2πfC
If frequency = 0
XC becomes ἀ
 XL = 2πfL
If frequency = 0
XL becomes 0

8. ADVANTAGES
DISADVANTAGE
•
•
Large in size andvoltage
• More output weight
High cost less output
• Ripple
• Suitable to be used with both HWR and FWR

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