GATE EE 2017 Set 2 — Question 39
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Power Electronics → Inverters → Sinusoidal PWM
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Question
The figure below shows a half-bridge voltage source inverter supplying an RL-load with and . The desired fundamental frequency of the load voltage is . The switch control signals of the converter are generated using sinusoidal pulse width modulation with modulation index, . At , the RL-load draws an active power of . The value of DC source voltage in volts is
Correct answer
(C) 500√(2)
Solution
1.Calculate the load impedance at :
2.Determine the RMS current from active power:
3.Calculate the RMS value of the fundamental output voltage:
4.Relate to for a half-bridge inverter with SPWM:
In a half-bridge inverter, the peak fundamental voltage is (where is the voltage of one of the split sources).Thus, the correct option is (C).
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