Question

Calculate the r.m.s value of diode current in 1-Φ Full wave semi-converter for the load (Highly inductive) current=.2 A and α=74°. (F.D configuration)

(a) .154 A

(b) .248 A

(c) .128 A

(d) .587 A

This question was posed to me during an internship interview.

This intriguing question comes from Solid-State Switching Circuits topic in division Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct choice is (c) .128 A

Explanation: The r.m.s value of diode current in 1-Φ Full wave semi-converter is Io√(α÷π). It is the r.m.s value of the diode current. Ir.m.s = Io√(α÷π)=.2√(.41)=.128 A.