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Which of the following converter circuit operations will be unstable for a large duty cycle ratio?

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Which of the following converter circuit operations will be unstable for a large duty cycle ratio?

(a) Buck converter

(b) Boost converter

(c) Buck-Boost converter

(d) Boost converter and Buck-Boost converter

The question was asked during an internship interview.

The above asked question is from Dynamics topic in chapter Dynamics of Electrical Drives of Electric Drives

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Correct choice is (d) Boost converter and Buck-Boost converter

To elaborate: The output voltage of the buck converter and buck-boost converter are Vo=Vin ÷ (1-D) and Vo = D×Vin ÷ (1-D) respectively. When the value of the duty cycle tends to 1 output voltage tends to infinity.

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