Power Sources and Supplies: World Class Designs

46

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Chapter 3

and size

of inductor are not necessarily related. However, we will now see that in power

conversion they often do turn out to be so, though rather indirectly.

Looking at Figure 3.6 , we can see that a smaller r will require a higher energy-handling

capability, and thus a larger inductor. Let us now formally go through all the possible

ways of reducing r .

Since we are assuming our application conditions are fi xed, the load current and input/

output voltages are also fi xed. Therefore, I

DC

is fi xed too. The only way we can cause r to

decrease under these circumstances is to make  I smaller. However, 