GATE EE 2015 Set 1 — Question 43
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Power Electronics → Inverters → Sinusoidal PWM
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Question
The single-phase full-bridge voltage source inverter (VSI), shown in figure, has an output frequency of . It uses unipolar pulse width modulation with switching frequency of and modulation index of . For , , , and , the amplitude of the fundamental component in the output voltage (in Volt) under steady-state is ________.
Correct answer
60 to 64
Solution
1.Fundamental component of the inverter output voltage for unipolar PWM is given by .
2.The filter transfer function is .
3.At fundamental frequency , .
4.Calculate impedances: .
5.Calculate .
6.Magnitude of transfer function: .
7.Amplitude of fundamental component in : .
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