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This paper proposes a three-phase six-inductor double-switch PFC circuit which is suitable for high frequency UPS application. This PFC circuit not only achieves high power factor correction in grid-connected mode of UPS, but also improves bus voltage in battery mode of UPS. This new PFC removes the independent boost design in common UPS and the whole cost can be reduced. The topology structure and...
An uninterruptible power supply (UPS) with high power factor and two conversion stages is suggested. The double-conversion configuration has three stages, but normally, only two stages are operating at the same time. The first stage of the proposed scheme integrates the power-factor-correction stage and the battery charger of the double-conversion configuration, obtaining a two-stage UPS. The second...
The paper analyzed in detail the operation principle, mathematical modes and distinct control manner using synchronous reference frame (SRF) of a three-phase series-parallel double conversion UPS system. The proposed control strategy can make this kind of UPS carry out all of the control goals: sinusoidal input current with unit power factor and sinusoidal output voltage with normal value in the case...
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