Title :
High frequency link DC/AC converter with PWM cycloconverter
Author :
Kawabata, Takao ; Honjo, Kenji ; Sashida, Nobuo ; Sanada, Kazunori ; Koyama, Masato
Author_Institution :
Mitsubishi Electr. Corp., Hyogo, Japan
Abstract :
A high-frequency link DC/AC converter developed for flexible, compact, and high-efficiency uninterruptible power supply (UPS) systems is discussed. The DC/AC converter consists of a 50% duty ratio rectangular voltage output inverter, a high-frequency transformer, a pulse-width modulation (PWM) cycloconverter, and an LC filter. For this converter, a three-phase output DC/AC converter can be easily realized with only one inverter and one three-phase cycloconverter. Conversion efficiency is inherently high because the inverter can utilize zero-current switching to minimize the switching loss. Output waveform control is improved because the dead time in the cycloconverter PWM can be eliminated. The main circuit configuration, the PWM method of the cycloconverter used to obtain a sinusoidal output voltage and the switching method of the inverter are described. The experimental results of a 1 kVA DC/AC converter using a high-frequency link of 20 kHz in both single-phase and three-phase output are discussed.<>
Keywords :
cycloconvertors; power convertors; pulse width modulation; uninterruptible power supplies; 1 kVA; 20 kHz; DC/AC converter; LC filter; PWM cycloconverter; UPS; high-efficiency; high-frequency link; high-frequency transformer; pulse-width modulation; rectangular voltage output inverter; single-phase; switching loss minimisation; three-phase; uninterruptible power supply; zero-current switching; Analog-digital conversion; Filters; Frequency conversion; Pulse inverters; Pulse transformers; Pulse width modulation; Pulse width modulation converters; Pulse width modulation inverters; Pulsed power supplies; Uninterruptible power systems;
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
DOI :
10.1109/IAS.1990.152325
