Half wave Rectifier:
Single phase half wave rectifier is shown in the figure 1.
Fig. 1 Fig. 2
In the positive half cycle, D is forward biased and conducts. Thus output voltage is same as input voltage. In negative half cycle, D is reverse biased, and thus output voltage is zero. The output voltage waveform is shown in the figure 2.
The average output voltage of rectifier can be given by
The average output current can be given by
When diode is reverse biased, the entire transformer voltage appears across diode. Maximum voltage across the diode is Vm. The diode should be capable to withstand this voltage. So PIV half wave rating of the diode should be equal to Vm in case of the single-phase rectifiers. The average current rating should be greater than Iavg
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