Question

Calculate the phase voltage for 3-∅ 180° VSI if the value of DC supply is 20 V.

(a) 9.40 V

(b) 9.42 V

(c) 9.18 V

(d) 9.78 V

I got this question in final exam.

Question is from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct choice is (b) 9.42 V

The best explanation: The phase voltage for 3-∅ 180° VSI is (√2÷3)×VDC=.471×20=9.42 V. In 3-phase 180° VSI each phase conducts for 180° and only two switches from different phases conduct at a single time.