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Why we need filters in DC power supply
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written 6.1 years ago by |
• Filters are the electronic circuits used along with rectifiers in order to get a pure ripple free dc voltage.
• Till now we have seen that from all the rectifiers we get a "pulsating" dc voltage as shown in Fig.(a).
• But this is not what we want. What we want is a pure dc waveform as shown in Fig. (b).
• In order to obtain it we use filters. A filter is connected at the output of the rectifier as shown in Fig. (c).
• We can connect a filter at the output of any type of rectifier. (HWR,FWR or bridge).
The filter circuits use resistor, capacitor and inductors, Therefore they are called as passive filters