Therefore , the AC output voltage can take on the values Vi , 0 or -- V ( 1 ) i .
Unlike the bipolar PWM technique , the unipolar approach uses states 1 , 2 , 3 and 4 from Table 2 to generate its AC output voltage .
The AC output voltage can take on the values Vi , 0 or -- V ( 1 ) i .
Unlike the bipolar PWM technique , the unipolar approach uses states 1 , 2 , 3 and 4 from Table 2 to generate its AC output voltage .