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 fundamen - Electrical Engineering NAT PYQs Based test 24: Power Electronics | ExamTest.live

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1 mark

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 75% of DC voltage, the required pulse width in degrees (round off up to one decimal place) is __________.

Correct Answer

112.5-113.2

Solution & Step-by-step Explanation

Concept: The output voltage of a single-phase full-bridge voltage source inverter is controlled by unipolar PWM with one pulse per half cycle. V_{o} = n = 1, 3 \dots \sum \infty {\frac{4 V _{s}}{nπ} sin \frac{nπ}{2} sin n d} sin nω t RMS value of the fundamental component V_{01} = {\frac{4 V _{s}}{π} sin \frac{π}{2} sin d} \frac{1}{2} \Rightarrow V_{01} = \frac{2 2 V _{s}}{π} sin d Calculation: Given that, V₀₁ = 75% of Vₛ \Rightarrow 0.75 V_{s} = \frac{2 2 V _{s}}{π} sin d \Rightarrow d = 56.41° pulse width = 2d = 112.82°

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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 75% of DC voltage, the required pulse width in degrees (round off up to one decimal place) is __________.

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