State the need of filters
Ans.
If we look for need of filters , than first of all we need to understand where do filter is used ?
Filters is used in the rectifier bridge circuit or we can say that in other words that it is used in a rectifier bridge device .
So , first of all let's see what is rectifier , rectifier is an electronic device or we can say that , rectifier is an electronics circuit which is used for converting (A.C) voltage or (A.C) current into a unidirectional flow of pulsating (D.C) voltage or (D.C) current .
As we know that rectifier bridge circuit gives output (O/P) pulsating direct current (D.C) but it is no more able to gives pure direct current . So because of this , we no more longer use in a some devices or we can say that some circuit because it may damage the circuit .
So overcome to this problem , we used filters to get pure direct current output (O/P).
1) As we know that , rectifier bridge circuit are used to convert alternate current (A.C) to direct current (D.C) but it not gives pure direct current so here filters play a very significant role to gives output pure direct current output .
2) Most advanced electronics system need pure direct current (D.C) supply to drive the electronics system .
3) To build a good power supply , which gives output pure direct current (D.C) , we need to removed out alternate current (A.C) from the output rectifier bridge circuit or we can say that in other words that , we need to filtered out the alternate current (A.C) from the output (O/P) of the rectifier bridge circuit or we can say that rectifier bridge device .
4) Filters are the electronics device or we can say that , filters are the electronics circuit, which is used along with rectifier in order to get a pure ripple free direct current (D.C) .
5) Filters can connected with any type of rectifier bridge circuit or we can say that rectifier bridge device given as , Half wave rectifier bridge circuit (HWR) and Full wave rectifier bridge circuit (FWR)
6) The filters circuit uses Resistor (R) , Capacitor (C) and Inductor (L) , That's why it is called as passive filters .
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