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What is a rectifier? Explain the working of semi-conductor diode as a full waverectifier with a necessary circuit diagram. Also give the input and output waveforms for the same |
Answer» Solution : Rectifier : Rectifier is an electronic device which converts AC into DC Fig shows the circuit diagram of a FULL wave rectifier. It makes use of two diodes `D_1` and `D_2`with a CENTRE TAPPED transformer. `R_L`is the load resistor across which the output is taken. When VOLTAGE at A with respect to the centre tap at any instant is positive, at that instant voltage at B being out of phase will be negative. So `D_1`GET formed forward biased and conducts, `D_2`get reverse biased and does not conduct. Hence during the half cycle we get an output voltage when voltage at A becomes negative with respect to centre tap the voltage at B would be positive. So diode `D_1`. does not conduct and `D_2`conducts. Hence during negative half cycle also, we get an output voltage. Thus output voltage is obtained during both positive and negative half cycles of ac. 
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