GATE EE 2019 Set 1 — Question 63
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Power Electronics → DC-DC Converters → Boost Converter
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Question
In a DC-DC boost converter, the duty ratio is controlled to regulate the output voltage at 48 V. The input DC voltage is 24 V. The output power is 120 W. The switching frequency is 50 kHz. Assume ideal components and a very large output filter capacitor. The converter operates at the boundary between continuous and discontinuous conduction modes. The value of the boost inductor (in ) is __________.
Correct answer
24 to 24
Solution
1.Calculate the duty ratio :
For a boost converter, 2.Calculate the output current :
3.Calculate the average inductor current :
4.Boundary condition:
At the boundary between continuous and discontinuous conduction modes, the peak-to-peak inductor current ripple is twice the average inductor current:5.Calculate the inductor value :
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