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Drawa labelled diagram of a full-wave rectifier circuit and briefly explain its working, Show the input-output waveforms. Or A student wants to use two p-n junction diodes to convert a.c. into d.c. Draw the labelled circuit diagram she would use and explain how it works. |
Answer» Solution :The circuit arrangement of a ful-wave rectifier using two diodes `D_(1)` and `D_(2)` has been shown in . We USE a centre tap transformer having its SECONDARY wound into two equal parts such that voltages at any instant at A (input of diode `(D_(1))` and B (input of diode `(D_(2))` are out of phase with each other. Let initially input voltage at A is positive then it will be negative voltage at B at that instant. Consequently diode `D_(1)` being in forward bias, conducts while `D_(2)`, being in reverse bias, does not conduct. We get output CURRENT and hence output voltage ACROSS load resistance R, joined between X and Y due to `D_(1)` . After half-cycle of a.c. input, voltage at A becomes negative and thatat B positive. Now diode `D_(1)` does not conduct but `D_(2)` conducts and output voltage is again OBTAINED across `R_(L)` in the same direction. Thus, output i obtained throughout the input wave cycle. The input and output waveforms have been shown in . 
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