Soft Transition Operation of UPS in High-Power-Factor Mode of Three-Phase Front-End Rectifier

A three-phase to single-phase ac-to-ac converter, with soft-transition of switches is presented. The converter has THD less than 4% and operates at almost unity-power-factor for wide variations in load, due to high frequency current injection, at the input of front-end- rectifier. A small filter is required at the output for filtering the high-frequency content. Sinusoidal PWM technique is used for controlling the output voltage. DSP is used for generating the desired gate pulses. The converter has high efficiency, low EMI emissions, high power packing density and suitable for UPS system. A Simulation and experimentation is carried out on a 3 kW converter and experimental results are in good agreement with simulation results.

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