GATE EE 2018 Set 1 — Question 13
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Power Electronics → AC-DC Converters → Semi & Full Converters (1φ)
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Question
A single phase fully controlled rectifier is supplying a load with an anti-parallel diode as shown in the figure. All switches and diodes are ideal. Which one of the following is true for instantaneous load voltage and current?
Correct answer
(C) vₒ ≥ 0 & iₒ ≥ 0
Solution
In the given circuit, a freewheeling diode (anti-parallel diode) is connected across the load.
1.Load Voltage (): The freewheeling diode conducts whenever the load voltage tries to go negative (due to the inductive nature of the load when thyristors are turned off). This clamps the load voltage to approximately zero during those intervals. Therefore, the instantaneous load voltage can never be negative, i.e., .
2.Load Current (): The thyristors in the full-bridge rectifier and the freewheeling diode only allow current to flow in one direction through the load (downwards in the diagram). Unidirectional switches ensure that the current cannot reverse. Therefore, .
Thus, and , which corresponds to option (C).Continue learning with Success Tracker
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