GATE EE 2019 Set 1 — Question 35
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Power Electronics → Inverters → Voltage Control Methods
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Question
The output voltage of a single-phase full bridge voltage source inverter is controlled by unipolar PWM with one pulse per half cycle. For the fundamental rms component of output voltage to be of DC voltage, the required pulse width in degrees (round off up to one decimal place) is ________.
Correct answer
111 to 115
Solution
For a single-phase full bridge voltage source inverter with single-pulse PWM (quasi-square wave), the output voltage can be expressed using a Fourier series:where is the pulse width per half cycle.The fundamental peak component () is:The fundamental rms component is:Given that :Taking the inverse sine:Rounding off to one decimal place, the required pulse width is .
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