GATE 2017 EE (EE2) – Question 26

Power Electronics · Single and three-phase configuration of uncontrolled rectifiers · 1 mark · Numerical answer

A controlled rectifier is fed by a 230 V, 50 Hz single-phase source through a 10:1 ideal transformer. All devices are ideal; T1 and T2 fire at 90° and 270° respectively. For the shown resistive load, rms current in diode D3, in amperes, is ________.

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Correct answer: 0 to 0

Explanation

D3 is the freewheeling diode across the load. A purely resistive load stores no magnetic energy, so its current becomes zero whenever the bridge stops supplying a positive load voltage.

During bridge conduction D3 is reverse-biased; outside conduction there is no stored-energy current to freewheel through it. Consequently D3 carries no current at any time in this ideal R-load circuit, and its rms current is **0 A**.

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