Peak inverse voltage PIV is the maximum reverse voltage that

Peak inverse voltage (PIV) is the maximum reverse voltage that a diode experiences in a circuit and should be smaller than its breakdown voltage. What is the PIV of the diode in a half-wave rectifier with a capacitive filter? What is the PIV of the diodes in a full-wave bridge rectifier with a capacitive filter?

Solution

1)In a halfwave rectifier, for the reverse bias there is no current flow in load resitance. so the secondary transformer Voltage is fully applied to the diode(-Vp), and capacitor will discharge(vp which stores in postive cycle) through Diode.

the max voltage across diode PIV=Vp-(-Vp)=2Vp

2)In a fullwave Bridge rectifier, the capacitor discharge time is slow compare to applied freq.in both cycles

The PIV of Brige rectifier will be Vp