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Explain the working of p-n junction diode as a full wave rectifier with circuit diagram. Give input and output waveforms. |
Answer» Solution : The circuit connections are made for full wave RECTIFIER as shown in circuit diagram. The circuit contains ac source, step down centre tapped transformer(T), two diodes (`D_(1)` and `D_(2)`) and a load resistance `(R_(L))`. During positive half cycle of input ac, the point A is possitive with respect to the point B. Then `D_(1)` is FORWARD biased and `D_(2)` is REVERSE biased. Thus `D_(1)` allows current `I_(1)` through the load `R_(L)` from M to N. During NEGATIVE half cycle of input ac, the point A is negative with respect to the point B. Then `D_(1)` is reverse biased and `D_(2)` is forward biased. Thus `D_(2)` allows current `I_(1)` through `R_(L)` from A to B. Thus the diodes allows both positive and negative half cycles of input ac through `R_(L)` in the same direction (from M to N). Hence the diode acts as full wave rectifier. Input and output wave forms as below 
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