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Which of the following statements is FALSE regarding a boost (step-up) converter design? (3) pts) a. High input voltage leads to high inductor ripple current b. Increasing duty ratio reduces the inductor current ripple c. Increasing switching frequency reduces the inductor current ripple d. Output voltage ripple is dependent on the load resistance 11. Which of the following statements is FALSE regarding a buck-boost converter? (2 pts) a. One way of designing buck-boost converter is by simply cascading buck and boost converters b. Cuk converter is one of the buck-boost converter topologies with inverted (negative) output voltage c. Cuk converter is a fundamentally different and new converter topology that it cannot be derived from the conventional buck-boost converter topologies d. Buck-boost converter is becoming more important due to increasing number of energy storages (e.g., batteries in smartphone, vehicles, and laptop) and necessity for bidirectional power flow

Answer :

Regarding the boost (step-up) converter design, the FALSE statement is c. Increasing switching frequency reduces the inductor current ripple.

In a boost converter design, a high input voltage indeed leads to high inductor ripple current(statement a).

The inductor ripple current is determined by the input voltage, output voltage, and switching frequency. Increasing the duty ratio, which is the ratio of the ON time to the total switching period, reduces the inductor current ripple (statement b).

By increasing the duty ratio, the ON time of the switch is increased, resulting in a smaller change in the inductor current. However, increasing the switching frequency does not reduce the inductor current ripple (statement c).

The switching frequency only affects the time available for the inductor current to change. Finally, the output voltage ripple in a boost converter is dependent on the load resistance (statement d). A higher load resistance leads to a larger output voltage ripple.

Therefore, the FALSE statement regarding a boost converter design is c. Increasing switching frequency reduces the inductor current ripple.

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