Question

In 3 − ϕ half wave rectifier, dc output voltage is 230v. The peak inverse voltage across each diode is

Answer 1

The peak inverse voltage of the 3 phase half wave rectifier will be 485 volts

Explanation:

For a 3 phase half wave rectifier we know that the DC output is given by the relation:

V₀ = 3√3Vm/2π

where Vm is the peak input voltage.  hence

230 = 3 x √3 x Vm/6.28 = 0.82 Vm

=> Vm = 230/0.82 = 280.5 v

Peak inverse voltage is defined as the maximum voltage a diode can withstand in the negative cycle.

For 3 phase half wave rectifier it is given by

PIV = √3Vm

= 1.732 x 280.5

=> PIV = 485 volts.

Hence the peak inverse voltage of the 3 phase half wave rectifier will be 485 volts.