Question

Calculate the line voltage for 3-∅ 180° VSI if the value of DC supply is 22 V.

(a) 18.52 V

(b) 18.12 V

(c) 17.96 V

(d) 15.48 V

This question was posed to me during an online exam.

My question comes from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct option is (c) 17.96 V

Easy explanation: The line voltage for 3-∅ 180° VSI is (√2÷√3)×VDC=.81×22=17.96 V. In 3-phase 180° VSI each phase conducts for 180° and only two switches from different phases conduct at a single time.