Question

Figure shows a chopper operating from a 150 V dc input, the duty ratio of switch S is 0.4. The average output voltage of the chopper will be

Answer 1

The given chopper is Buck-Boost

$V_0=\frac{V_s\times D}{1-D}$

$V_0=\frac{150\times 0.4}{1-0.4}=\frac{150\times 4}{6}=100V$

But the polarity is opposite in the question.
so, $V_0=-100V$