Title :
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
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;
Conference_Titel :
Power Electronics Specialists Conference, 1990. PESC '90 Record., 21st Annual IEEE
Conference_Location :
San Antonio, TX, USA
DOI :
10.1109/PESC.1990.131264
