GATE EE 2014 Set 1 — Question 63
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Power Electronics → AC-DC Converters → Output Voltage & Ripple
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Question
The figure shows the circuit diagram of a rectifier. The load consists of a resistance and an inductance connected in series. Assuming ideal thyristor and ideal diode, the thyristor firing angle (in degree) needed to obtain an average load voltage of is ______
Correct answer
69 to 70
Solution
Step 1 - the circuit. The thyristor feeds the R-L load from the source V, so V. The diode across the load is a freewheeling diode.Step 2 - output voltage waveform. From the firing instant to the thyristor conducts and the load voltage equals the source voltage. When the source goes negative, the load inductance forces the current through the freewheeling diode, which clamps the load voltage to 0 (and if the current dies out the load voltage is also 0). The thyristor is reverse biased until it is fired again at . So the load voltage never goes negative, and its average does not depend on :Step 3 - solve for .Answer: (any value from to is accepted)
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