| Summary: | 博士 === 國立臺灣大學 === 電機工程學系 === 85 === The research of the dissertation focuses on the topologies of
single-phase AC/DC/AC converter with pre-staged power-factor-
correction (PFC). In the beginning, new topologies for PFC-
prestaged AC/DC/AC converter are presented. The introduction of
common-neutral connection simplifies the conventional connection
of AC/DC/AC structure, and gives new topologies that still have
good performance, conform with output safety regulations and
have other advantages such as requiring fewer power devices and
having loweconduction losses. Then a new on-line uninterruptible
power supply (UPS) structure is also presented. It consists of a
dual-functional PFC substituting for an inevitable battery-
voltage booster thereby simplifying the complexity of power
stage. Finally an even simpler topology of power stage for UPS
applications is to be shown. This new single-conversion UPS
mainly consists of a minimized power converter structure which
is capable of providing specified constant output voltage,
phase-controlled battery charr, and input-power-factor
improvement.
|
|---|
