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SINGLE PHASE UPS SYSTEM WITH IMPROVED EFFICIENCY AND SINUSOIDAL INPUT CURRENT
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| Author(s) |
Nándor Burány; Aleksandar Jelic |
| Abstract |
A new topology of on line uninterruptible power supply (UPS) system is proposed. The main features of the system are high efficiency and high input power factor. Efficiency is improved by the elimination of the line frequency input and output transformers and reducing the number of converter stages. Power factor correction is obtained by active wave shaping of the input current. By the proposed UPS topology the lead is never supplied from the mains, so amplitude and frequency variations are not transferred from the input to the output. Switching from line operation to battery operation is without static bypass switches and without break in the output power. A laboratory prototype of the UPS system based on the proposed topology is built and tested. Detailed description of the converter stages and the control circuitry is given. The active harmonic filter is modeled using the averaged model of the pulse-width modulated switch. Simulation and experimental results are presented. |
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| Filename: | Unnamed file |
| Filesize: | 2.714 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-15 by System |
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