The GATE Grind

GATE 2019 EE – Question 47

Power Electronics · DC to DC conversion: Buck, Boost and Buck-Boost Converters · 2 marks · Multiple choice

A DC-DC buck converter operates in continuous conduction mode. It has 48 V input voltage, and it feeds a resistive load of $24\ \Omega$. The switching frequency of the converter is 250 Hz. If switch-on duration is 1 ms, the load power is

  1. 6 W
  2. 12 W
  3. 24 W
  4. 48 W

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Show answer and explanation

Correct answer: (A) 6 W

Explanation

The period is $\frac{1}{250}=4$ ms, so $D=\frac14$ and $V_o=0.25\times48=12$ V. The load power is $\frac{12^2}{24}=6$ W.