Semiconductor Diode as Half Wave Rectifier.
Semiconductor Diode as Half Wave Rectifier
Principle
It is based on the principle that in a pn junction diode the current flows only if it is forward biased and negligible current flows if it is reverse biased.
Circuit arrangement
The basic circuit for half wave rectifier is shown in fig. Most electronic equipments have transformer at the input. The transformer allows us to step the voltage up or down to get desired level of d.c. voltage and can provide isolation from the power line and thus reduces the risk of electrical shock. The a.c. supply to be rectified is applied to the primary (P) of a transformer. The secondary (S) is connected in series with the diode and the load resistance RL.
Theory
The a.c. voltage across the secondary changes polarities after every half cycle.
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