DocumentCode :
1161642
Title :
Quasi-active power factor correction with a variable inductive filter: theory, design and practice
Author :
Wölfle, Werner Hugo ; Hurley, William Gerard
Author_Institution :
Dept. of Electron. Eng., Nat. Univ. of Ireland, Galway, Ireland
Volume :
18
Issue :
1
fYear :
2003
fDate :
1/1/2003 12:00:00 AM
Firstpage :
248
Lastpage :
255
Abstract :
The mains current in an AC/DC converter contains periodic current pulses, due to the action of the rectifier and the output buffer capacitor. The high current peaks cause harmonic distortion of the supply current and low power factor. Introducing active power factor correction in the form of a boost pre-regulator can reduce the level of harmonics. Passive power factor correction in the form of an input filter inductor is less expensive but the component is bulky because it must be sized to handle the full power range of the supply. This paper investigates the use of variable inductance (the inductance varies with current), which provides adequate harmonic reduction. Three types of inductors are investigated: an inductor with a fixed air-gap operating with a saturated core, a swinging inductor which has a stepped gap and a novel inductor construction with a sloped air-gap (SAG). Results are presented for a 200 W power supply and it is shown that the SAG inductor has the best performance in terms of harmonic response and size.
Keywords :
AC-DC power convertors; air gaps; harmonics suppression; inductance; inductors; power conversion harmonics; power factor correction; power supplies to apparatus; rectifying circuits; AC/DC converter; active power factor correction; boost pre-regulator; fixed air-gap inductor; harmonic distortion; harmonic reduction; high current peaks; input filter inductor; low power factor; output buffer capacitor; passive power factor correction; periodic current pulses; power supply; quasi-active power factor correction; rectifier; sloped air-gap inductor; supply current; variable inductance; variable inductive filter; Active filters; Air gaps; DC-DC power converters; Filtering theory; Inductance; Inductors; Power factor correction; Power harmonic filters; Power system harmonics; Rectifiers;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2002.807135
Filename :
1187344
Link To Document :
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