Question

In a single phase full bridge PWM inverter, $V_d$ varies in a range of 295 – 325 V. Output of inverter is desired to be 200 V(rms) and the maximum load current is 10 A (rms) at the fundamental frequency. The value of switch utilization ratio assuming ideal operating conditions will be_________.

• A. 0.11

Answer 1

The correct option is A 0.11
$V_T=V_{dmax}=325V$

$I_T=\sqrt{2}\times I_O=\sqrt{2}\times 10=14.14A$

For 1-$\varphi$ FBI, number of switches = 4

The maximum output volt-ampere

$V_{01}\times I_{01max}=200\times 10=2000VA$

Switch utilization ratio $=\frac{V_{01}{I}_{01max}}{q{V}_T{I}_T}=\frac{2000}{4\times 325\times 14.14}=0.11$