Title :
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
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;
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
DOI :
10.1109/INTLEC.2009.5351976
