Tf. Wu et Yk. Chen, Analysis and design of an isolated single-stage converter achieving power-factor correction and fast regulation, IEEE IND E, 46(4), 1999, pp. 759-767
This paper presents the analysis and design of an isolated single-stage con
verter achieving high-power-factor correction and fast regulation. By using
the technique suggested by Wu et at, a buck-boost converter and a flyback
converter can be integrated to form the discussed converter. The buck-boost
semistage working in the discontinuous conduction mode (DCM) functions as
a power-factor corrector, and the flyback semistage operating in the DCM is
a voltage regulator which is controlled, theoretically, to be independent
of load variation. An approximated small-signal model of the converter oper
ating in the DCM is developed, Design of a peak-current feedback loop with
an optimal proportional integral controller is also presented. A prototype
is implemented to verify that the analysis and design are effective and fea
sible.