Title :
A Single Phase Uninterruptible Power System with a Gradationally Controlled Voltage Inverter
Author :
Mori, Osamu ; Yamada, Masaki ; Iwata, Akihiko ; Maruyama, Shinichiro ; Okada, Joji ; Hatakeyama, Yoshihiro
Author_Institution :
Mitsubishi Electr. Corp., Hyogo
Abstract :
We have developed a gradationally controlled voltage inverter which is capable of outputting a high-precision waveform even at low switching frequencies and have succeeded in putting it to practical use. This inverter uses plural inverters which have a binary or ternary DC-link voltage ratio with one another, and are connected in series to output the sum of their output voltages. The waveform of the resultant output voltage is quasi-sinusoidal. In this paper, a new UPS applying this technology is explained. The UPS with the high efficiency of 97% and the thin size of 29 mm/kVA has been realized by the miniaturization of the LC output filter and the loss reduction of the power devices
Keywords :
invertors; power filters; switching convertors; uninterruptible power supplies; DC-link voltage ratio; LC output filter; UPS; gradationally controlled voltage inverter; high-precision waveform; plural inverters; single phase uninterruptible power system; Control systems; Electrical equipment industry; Filters; Industrial control; Network servers; Pulse width modulation inverters; Switching frequency; Uninterruptible power systems; Voltage control; Voltage fluctuations;
Conference_Titel :
IEEE Industrial Electronics, IECON 2006 - 32nd Annual Conference on
Conference_Location :
Paris
Print_ISBN :
1-4244-0390-1
DOI :
10.1109/IECON.2006.347466