GATE EE 2015 Set 1 — Question 53
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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 50 Hz. It uses unipolar pulse width modulation with switching frequency of 50 kHz and modulation index of 0.7. For , , , and , the amplitude of the fundamental component in the output voltage (in Volt) under steady-state is ___________.
Correct answer
60 to 64
Solution
For a single-phase full-bridge VSI with unipolar PWM, the peak value of the fundamental component of the inverter output voltage is . The fundamental frequency is , so . The output voltage is obtained after the LC filter. The transfer function is . Substituting , we get . With , , and , we find and . Thus, . The amplitude of the fundamental component of is .
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