GENERALLY, a single-inductor, single-switch boost
converter topology and its variations exhibit a satisfactory
performance in the majority of applications where the
output voltage is greater than the input voltage. Nevertheless,
in a number of high-power applications, the performance
of the boost converter can be improved by implementing a
boost converter with multiple switches and/or multiple boost
inductors. Usually, multiple-switch and/or multiple-inductor
boost topologies are employed in high input-current and/or
high input-to-output voltage conversion applications. So far,
a number of isolated and nonisolated multiple-switch and/or
multiple-inductor topologies have been proposed, analyzed,
and evaluated [1]–[10].
As an example, an interleaved boost topology is sometimes
used in high-power applications to eliminate reverse-recovery
losses of the boost rectifier by operating the two boost converters
at the boundary of continuous-conduction mode (CCM) and discontinuous-conduction
mode (DCM) so that the boost switches
are turned on when the current through the corresponding boost
rectifier is zero [1]–[4]. Generally, interleaving is employed to
reducetheinputcurrentrippleand,therefore,tominimizethesize
of the input filter that would be relatively large if a single DCM
boost converter were used. However, to achieve the operation at
the CCM/DCM boundary under varying line and load-current
conditions, the interleaved boost converter requires variable
switching frequency control which is often more complex to
implement than constant-frequency control [1]–[4]. In addition,
variable-frequency control in some applications is not desirable.
Another multiswitch boost converter is proposed in [5] for
high-power applications that require an isolated PFC implementation.
The circuit can also be employed in applications that re