Title :
DC-AC converter with high frequency DC link for UPS applications
Author :
Horta H., S. ; Cardenas G., V.M.
Author_Institution :
Centro Nacional de Investigacion y Desarrollo Tecnologico, Madrid
Abstract :
An uninterruptible power supply (UPS) is an emergency power source. It continues the supply of power after the mains supply has failed. The majority of UPSs are AC; they produce a supply like the AC mains supply. This paper deals with the DC-AC power stage design, as an integral part of a UPS. The input voltage for the power converter is supplied by a set of backup batteries, while the output voltage has the following characteristics: sinusoidal waveform with THD <3% (total linear load); synchrony with mains power supply; and high frequency isolation. The authors show the principal considerations used for optimum configuration selection, inverter PWM technique, power devices, dead time effect compensation and total system efficiency. Theoretical and experimental results show good agreement for both voltage and current waveforms under different load conditions
Keywords :
DC-AC power convertors; PWM invertors; harmonic distortion; load (electric); power system harmonics; secondary cells; uninterruptible power supplies; DC-AC power convertor; THD; backup batteries; current waveforms; dead time effect compensation; efficiency; emergency power source; high frequency isolation; inverter PWM technique; load conditions; mains power supply; output voltage; power devices; power stage design; sinusoidal waveform; total linear load; uninterruptible power supply; voltage waveforms; Batteries; Emergency power supplies; Ferroresonance; Frequency conversion; Power supplies; Pulse width modulation; Pulse width modulation converters; Student members; Uninterruptible power systems; Voltage;
Conference_Titel :
Power Electronics Congress, 1994. Technical Proceedings. CIEP '94., 3rd International
Conference_Location :
Puebla
Print_ISBN :
0-7803-2068-9
DOI :
10.1109/CIEP.1994.494410
