Resonant Converters 20-21
in the B&B converter (Table 20.4). Taking into account V
o
/V
i
= I
i
/I
o
, the voltage ratio is V
o
/V
i
≤ 1 for the
buck converter, V
o
/V
i
≥ 1 for the boost converter as I
o
≥ I
i
in the buck and I
o
≤ I
i
in the boost converter,
respectively. V
o
/V
i
can be higher or lower than unity for the B&B converter.
e peak value of the capacitor voltage is clamped in the positive channel on V
ip
for buck converter, on
(V
ip
+ V
op
) for B & B converter, and on V
op
for boost converter, respectively (Table 20.4). Similar statement
holds for the negative channel.
An important advantage is the so switching of S and D in DCM. e sinusoidal current in S starts
from zero (zero current turn on). Both in CCM and in DCM the current commutates from