2020 전력전자 기말고사 문제지

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2 (10 pts only when you answer them all correctly. No partial credit) Please select the correct answer
for the following questions. Justify your answers.
(a) Imagine that you have a boost converter operating with a given load and a fixed duty cycle. Is it OK
to disconnect the load and leave the boost converter with no load? Why or why not?
(b) Suppose that you want to reduce the size of the output capacitor of a buck converter without
increasing the output voltage ripple. Will you increase or decrease your switching frequency? Why?
(c) Suppose that you build a boost converter. When you test it, you realize that it is operating in the
discontinuous conduction mode. If you want to make it to operate in the continuous conduction
mode and you can only change your inductor design, will you increase or decrease its inductance?
(d) In the overmodulation region of an inverter, as compared with the linear modulation region, is the
switching frequency of the switches decreased or increased?

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