RC and LC Filters - Circuit Diagram, Waveforms and Working Principle - MyClassBook
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December 7, 2013
RC And LC Filters – Circuit Diagram,Waveforms And Working Principle
RC And LC Filters:i friends, today we are going to learn some basic filter circuits like RC filterand LC filter.
RC Filter:
RC filter
In the above figure two sections of RC filter are shown. These are connected betweenthe input capacitor and the load resistor. The value of R should be at least 10 timesgreater than the capacitive reactance Xc. Therefore the ripple is dropped across theseries resistors instead of across the load resistor. Each section reduces the ripple bya factor of 10. Therefore ac components are removed and at the output we get asteady dc voltage.
The main disadvantage of RC filter is the loss of dc voltage across each R. ThereforeRC filter is suitable only for light loads. i.e. small load current.
LC Filters:
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11/12/2015 RC and LC Filters Circuit diagram, waveforms and working principle MyClassBook
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About Me
MayureshJoshi
(Assistant System
Engineer in TCS)
LC filter
In this type inductor L is in series and capacitor C is in shunt with load. The choke(L) allows the dc component to pass through easily because its dc resistance R is verysmall. The capacitive reactance Xc is very high for dc and it acts as open circuit. Alldc current passes through across which dc output voltage is obtained.
The inductive reactance XL = 2πfL is high for ac components. Therefore the ripplesare reduced. Even if any ac current passes through L, it flows through the capacitorbecause of its low capacitive reactance.
Advantages Of LC Filter:1) In choke input filter, current flows continuously. Therefore the transformer is usedmore efficiently.
2) Ripple content at the output is low.
3) It is less dependent on the load current.
4) DC voltage drop across L is much smaller because its de resistance R is very small.
Disadvantages Of LC Filter:1) Large size and weight of inductors,
2) More cost,
3) External hold is produced by inductor.
For providing smoothest output voltage π type (capacitor input) filtercan be used.
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