Which of the following does NOT happen when inductance increases?Question 4Select one:a.Movement from DCM (Discontinuous Conduction Mode) to CCM (Continuous Conduction Mode)b.Output voltage decreases (In DCM)c.Current ripple increasesd.Voltage ripple decreases
Question
Which of the following does NOT happen when inductance increases?Question 4Select one:a.Movement from DCM (Discontinuous Conduction Mode) to CCM (Continuous Conduction Mode)b.Output voltage decreases (In DCM)c.Current ripple increasesd.Voltage ripple decreases
Solution
The answer is c. Current ripple increases.
Here's why:
a. When inductance increases, the system can indeed move from Discontinuous Conduction Mode (DCM) to Continuous Conduction Mode (CCM). This is because a higher inductance can store more energy, reducing the chances of the current dropping to zero (which characterizes DCM).
b. In DCM, an increase in inductance can cause the output voltage to decrease. This is because the inductor resists changes in current, and a larger inductor will resist these changes more. This can result in a lower average current, and thus a lower output voltage.
c. However, an increase in inductance does not necessarily cause the current ripple to increase. In fact, it's more likely to decrease. The current ripple is the variation in current around its average value. A larger inductor can store more energy and thus smooth out these variations, leading to a smaller current ripple.
d. Similarly, a larger inductor can also reduce the voltage ripple, which is the variation in voltage. This is because the inductor can store energy and release it when the voltage drops, thus smoothing out the voltage variations.
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