Analysis and design of DCM SEPIC PFC with adjustable output voltage

Author

Rui Chen ; Jih-sheng Lai

fYear

2015

fDate

15-19 March 2015

Firstpage

477

Lastpage

484

Abstract

In this paper, a non-isolated hard switching DCM SEPIC PFC with adjustable output voltage is analyzed and designed. With PWM switching averaged model, DC-DC and PFC operation are discussed first. Then with coupled inductor model, a winding scheme is proposed to control the coupling coefficient of coupled inductors in SEPIC. With carefully designed coupling coefficient, the equivalent input inductance can be implemented with much smaller number of winding turns. For the voltage follower control scheme of DCM PFC, controller and notch filter design are discussed. With the notch filter or the PR controller in another word, THD of the input current can be greatly reduce. The analysis and design are verified by experimental results from a 1kW prototype.

Keywords

control system synthesis; notch filters; power factor correction; power filters; voltage control; PR controller; PWM switching averaged model; THD; adjustable output voltage; controller design; coupled inductor model; coupling coefficient; dc-dc operation; equivalent input inductance; non-isolated hard switching DCM SEPIC PFC; notch filter design; power 1 kW; power factor correction; voltage follower control scheme; winding turns; Couplings; Inductance; Inductors; Rectifiers; Switches; Voltage control; Windings; Coupled Inductor; DCM; Notch Filter; PFC; PR controller; Ripple Steering; SEPIC;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE

Conference_Location

Charlotte, NC

Type

conf

DOI

10.1109/APEC.2015.7104393

Filename

7104393