A comparison study of boost and Buck-boost power factor corrector for ultra-wide input voltage range applications

Author

Sheng-Yang Yu ; Hung-Chi Chen

Author_Institution

Texas Instrum., Power Design Services, Dallas, TX, USA

fYear

2014

fDate

14-18 Sept. 2014

Firstpage

2719

Lastpage

2726

Abstract

Due to the potential need for ultra-wide input voltage range power factor correction (PFC) circuit, one may consider Buck-boost converter as a PFC circuit (PFC Buck-boost) instead of Boost converter (PFC Boost). The voltage step-up/down freedom of Buck-boost converter allows a lower output voltage and smaller duty cycle compared to Boost converter. In addition, indirect input/output path limits the startup inrush current of PFC Buck-boost. Unlike PFC Boost, PFC Buck-boost doesn´t need an inrush current limiting circuit, which allows a lower cost PFC circuit by applying Buck-boost converter. This paper conducts a comparison study of PFC Boost and PFC Buck-boost for a two stage system (PFC stage in cascade with an isolated DC-DC converter). Transient mode PFC is selected in this study for low power applications. Two 100W power supply prototypes are made for this comparison. The results show that PFC Buck-boost is able to provide a higher efficiency than PFC Boost under low input voltage with fewer power stage circuit components.

Keywords

current limiters; power convertors; power factor correction; power supply circuits; PFC Boost converter; PFC buck-boost converter inrush current; duty cycle; power 100 W; power supply prototype; transient mode PFC; ultra wide input voltage range power factor correction circuit; voltage step-up-down freedom; Inductors; Limiting; Prototypes; Reactive power; Surges; Switching frequency; Thermistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2014 IEEE

Conference_Location

Pittsburgh, PA

Type

conf

DOI

10.1109/ECCE.2014.6953766

Filename

6953766