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Calculate the phase voltage for 3-∅ 120° VSI if the value of DC supply is 26 V.(a) 10.52 V(b) 10.97 V(c) 10.96 V(d) 10.61 VThe question was asked during a job interview.This intriguing question originated from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives

Answer»

The correct answer is (d) 10.61 V

To EXPLAIN I would say: The line voltage for 3-∅ 120° VSI is (VDC÷√6)=10.61 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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