The inverter is using unbipolar square puls modulation. Uh$=$formula gives you the harmonic components in the figur. Applied voltage Udinn$=12$V

Maximum supplied current IN$=25$A

Internal DC$-$link voltage ud$=?$

Supplied voltage Us$=230$V

Maximum emitted power PN$=300$W

Interval without supplied voltage u$=$pi$/6$

For DC supply to the converter I have:

Voltage U$=12$V

Maximum load current IN$=11\mathrm{.}3$ A

$1)$ Find the necessary Ud for the given basic harmonic effective value of the square pulse voltage Us$=230$V$,$ on the assumption that the converter is a full$-$bridge converter.

$2)$ find the rms value of the $5$ most dominant harmonic components in the voltage

$3)$ calculate THD for a converter with pure $($Bipolar$)$ square pulse voltage and the same DC$-$link voltage.

$4)$ Calculate THDu for unibipolar square pulse voltage with u $=$ pi$/6$