Peak Inverse Voltage of Center Tap Rectifier

Peak Inverse Voltage Each diode in the full-wave rectifier is alternately forward-biased and then reverse-biased. The maximum reverse voltage that each diode must withstand is the peak secondary voltage Vp(sec). This is shown in Figure where D2 is assumed to be reverse-biased (red) and D1 is assumed to be forward-biased (green) to illustrate the concept.

Peak Inverse Voltage of Center Tapped Transformer Rectifier

Fig : Diode reverse voltage ( D2 Reverse Biased & D1 Forward Biased )

When the total secondary voltage Vsec has the polarity shown, the maximum anode voltage of D1 is Vp(sec)> 2 and the maximum anode voltage of D2 is -Vp(sec)>2. Since D1 is assumed to be forward-biased, its cathode is at the same voltage as its anode minus the diode drop; this is also the voltage on the cathode of D2.

The peak inverse voltage across D2 is

Center Tapped Full Wave Rectifier PIV

Therefore, by substitution, the peak inverse voltage across either diode in a full-wave center tapped rectifier is

Peak inverse Voltage Formula

 

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