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Calculate the phase voltage for 3-∅ 120° VSI if the value of DC supply is 78 V.(a) 30.45 V(b) 15.18 V(c) 31.84 V(d) 48.15 VThe question was asked in an international level competition.The origin of the question is Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives

Answer»

Correct CHOICE is (c) 31.84 V

The best I can EXPLAIN: The line voltage for 3-∅ 120° VSI is (VDC÷√6)=31.84 V. In 3-phase 120° VSI each phase conducts for 120° and only three switches from different phases conduct at a SINGLE time.



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