Zero-current soft-switching bidirectional DC-DC converter for high efficiency DC uninterruptible power supply

Author

Choi, Woo-Young ; Ju, Ju-Hong ; Park, Sung-Jun ; Kim, Kwang-Heon ; Lim, Young-cheol

Author_Institution

Bradley Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

fYear

2009

fDate

18-22 Oct. 2009

Firstpage

1

Lastpage

3

Abstract

The usual way to avoid a computer shutdown during a mains failure is to connect an ac uninterruptible power supply (UPS). Alternatively, in this paper, a simple and high efficiency dc UPS is presented by proposing an isolated bidirectional soft-switching dc-dc converter. The bidirectional dc-dc converter operates under zero-current switching (ZCS) condition by utilizing the leakage inductor of the transformer. ZCS operation is achieved in battery-backup and charging modes which significantly reduces the power losses in the bidirectional converter. Also, high efficiency is achieved in backup and charging modes because there is only a single dc-dc conversion in each mode. A 1 kW prototype system has been built and tested for a PC power system.

Keywords

DC-DC power convertors; computer power supplies; inductors; uninterruptible power supplies; zero current switching; PC power system; ZCS; bidirectional DC-DC converter; dc UPS; dc uninterruptible power supply; leakage inductor; power losses; zero-current soft-switching DC-DC converter; Batteries; Circuits; DC-DC power converters; Diodes; Power supplies; Rectifiers; Switches; Uninterruptible power systems; Voltage; Zero current switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Energy Conference, 2009. INTELEC 2009. 31st International

Conference_Location

Incheon

Print_ISBN

978-1-4244-2490-0

Electronic_ISBN

978-1-4244-2491-7

Type

conf

DOI

10.1109/INTLEC.2009.5351976

Filename

5351976