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The Voltage Source Inverter $(VSI)$ shown in the figure below is switched to provide a $50 Hz$, square-wave
ac output voltage $(vo)$ across an $R-L$ load. Reference polarity of $vo$ and reference direction of the output
current $i_0$ are indicated in the figure. It is given that $R$ = 3 $\Omega$, $L$ = 9.55 $mH$

Appropriate transition i.e., Zero Voltage Switching $(ZVS)$/Zero Current Switching $(ZCS)$ of the
$IGBTs$ during turn-on/turn-off is

  1. ZVS during turn-off
  2. ZVS during turn-on
  3. ZCS during turn-off
  4. ZCS during turn-on
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