GATE EE 2020 Set 1 — Question 21
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Power Electronics → AC-DC Converters → Line Current Harmonics
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Question
A single-phase, full-bridge diode rectifier fed from a , sinusoidal source supplies a series combination of finite resistance, , and a very large inductance, . The two most dominant frequency components in the source current are:
Correct answer
(C) 50 Hz, 150 Hz
Solution
For a single-phase full-bridge diode rectifier supplying a series load with a very large inductance , the load current tends to be almost constant (DC). The source current drawn from the AC supply by such a rectifier is a square wave that is in phase with the input voltage. The Fourier series expansion of a square wave contains the fundamental frequency and its odd harmonics. If the input source frequency is , then the frequency components in the source current will be .Therefore, the dominant frequency components in the source current will be:
1.The fundamental frequency:
2.The third harmonic frequency:
These are the two most dominant frequency components. The component (DC) is present in the load current, but not typically considered a dominant component in the AC source current itself, which is ideally an alternating waveform.The final answer is Continue learning with Success Tracker
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