GATE EE 2020 Set 1 — Question 61
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Power Electronics → AC-DC Converters → Firing, Extinction & Overlap Angles
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Question
A single-phase, full-bridge, fully controlled thyristor rectifier feeds a load comprising a resistance in series with a very large inductance. The rectifier is fed from an ideal , sinusoidal source through cables which have negligible internal resistance and a total inductance of . If the thyristors are triggered at an angle , the commutation overlap angle in degree (rounded off to 2 decimal places) is ________.
Correct answer
4.51 to 5.1
Solution
Given:
, , For a full-bridge rectifier with source inductance and constant load current :
Since :
Now, use the overlap formula:
.
, , For a full-bridge rectifier with source inductance and constant load current :
Since :
Now, use the overlap formula:
.
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