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What is Rectification? Describe with a circuit diagram the working of a p-n junction diode as half wave rectifier with input and output waveforms. |
Answer» Solution :The process of converting ac into dc is called rectification   The diode D in series with a load resistor `R_(L)` is connected to the secondary of the transformer. The ac voltage to be rectified is applied to the primary of the transformer. The secondary of a transformer supplies the DESIRED ac voltage across terminals A and B. The output dc voltage is taken across the load `R_(L)`. WORKING: During the POSITIVE half cycle of input ac voltage, the end A becomes positive with respect to the end B. As a result the diode becomes forward biased and conducts the current. The current flows in the direction `ADR_(L)BA`. During the negative half cycle of input ac voltage, the end A becomes negative with respect to teh end B. As a result the diode becomes reverse biased and does not conducts the current. Thus the current flows through the diode during positive half cycle only. The current flows through the load `R_(L)` ALWAYS in the same direction. HENCE dc output is obtained. |
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