On/Off Control of Boost PFC Converters to Improve Light-Load Efficiency in Paralleled Power Supply Units for Servers

Author

Hyoung-Suk Kim ; Jae-Kuk Kim ; Ki-Bum Park ; Hyun-Wook Seong ; Gun-Woo Moon ; Myung-Joong Youn

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

Volume

61

Issue

3

fYear

2014

fDate

Mar-14

Firstpage

1235

Lastpage

1242

Abstract

This paper proposes an on/off control of boost power factor correction (PFC) converters to improve the light-load efficiency in paralleled power supply units (PSUs) for servers. The proposed scheme operates the PFC stages of two paralleled PSUs alternately during one cycle of a 60-Hz ac input only at light loads. This improves the light-load efficiency without deteriorating the heavy-load efficiency by reducing load-independent losses such as capacitive turn-on and core losses. In addition, the proposed scheme alleviates the harmonic distortion by reducing the discontinuous conduction mode region. Experimental results from 1.6-kW PFC boost converters are shown to verify the proposed work.

Keywords

harmonic distortion; load regulation; losses; power convertors; power factor correction; power supply circuits; boost PFC converters; discontinuous conduction mode region; frequency 60 Hz; harmonic distortion; light-load efficiency; load-independent losses; on-off control; paralleled PSU; power 1.6 kW; power factor correction; power supply units; Boost converter; light-load efficiency; on/off control; paralleled power supply units (PSUs); power factor correction (PFC); servers;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2013.2258301

Filename

6502697