High frequency link DC-AC converter for UPS with a new voltage clamper

Author

Yamato, Ikuo ; Tokunaga, Norikazu ; Matsuda, Yasuo ; Suzuki, Yutaka ; Amaro, H.

Author_Institution

Hitachi Ltd., Ibaraki, Japan

fYear

1990

fDate

0-0 1990

Firstpage

749

Lastpage

756

Abstract

A power conversion system for a UPS (uninterruptible power supply) using a high-frequency link is described. The proposed UPS consists of a high-frequency inverter, a high-frequency transformer, and a cycloconverter with a new voltage clamper. The clamper effectively reduces the power loss of the conversion system. The voltage clamper gave an improved DC-AC conversion efficiency of about 10% more than when a conventional RC snubber was used. When source-commutation was used, DC-AC conversion efficiency was improved by about 5%. When the voltage clamper was used both DC-AC conversion efficiency and the output voltage characteristic without the automatic voltage regulator were improved to source commutation. Fabrication of a 10 kVA high-frequency-link DC-AC power converter is described and its loss reduction effect is demonstrated.<>

Keywords

cycloconvertors; high-frequency transformers; invertors; power convertors; uninterruptible power supplies; 10 kVA; DC-AC power convertors; HF; UPS; cycloconverter; efficiency; high-frequency link; high-frequency transformer; inverter; output voltage characteristic; power loss; source-commutation; uninterruptible power supply; voltage clamper; Capacitors; Diodes; Filters; Frequency conversion; Inductance; Inductors; Rectifiers; Switches; Uninterruptible power systems; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1990. PESC '90 Record., 21st Annual IEEE

Conference_Location

San Antonio, TX, USA

Type

conf

DOI

10.1109/PESC.1990.131264

Filename

131264