F.2
F.3
Alternatively,
which can be arranged as
which is Eq. (19.11).
Boost converter
For a boost converter (see Figure 19.9 (b)) in the on mode the voltage across the inductor
can be expressed as
where V d is the voltage level to be converted. In the on mode, the increase of current in the
inductor can be written as
Similarly, during the off mode, the voltage across the inductor can be expressed as
while the decrease of current in the inductor can be written as
In steady-state operation the flow of current across the inductor has to be zero,
or, alternatively,
This equation can be rearranged as
which is the same expression as Eq. (19.15)
Buck-boost converter