Question

An ideal switch S is operated at 100 kHz with a duty ratio of 50%. The ripple current in capacitor, $\Delta i_c$ is 1.6 A peak-to-peak and average power delivered is 80 W. The peak current in switch 'S' is ______ A.

• A. 8.8

Answer 1

The correct option is A 8.8
The average output voltage,

$V_0=\alpha V_s$

$=0.5\times 20$

$=10V$
The power delivered to load = 80 W

Load current $=\frac{80W}{10}=8A$

The ripple current (peak to peak) in capacitor
= 1.6 A

$\therefore$$Peakcurrent=I_0+\frac{\Delta i_c}{2}=8+\frac{1.6}{2}$
= 8 + 0.8 = 8.8 A