Online uninterruptible power supply topology
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United States of America Patent
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Nov 14, 2017
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app pub date -
Aug 7, 2013
filing date -
Sep 20, 2012
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Abstract
An uninterruptible power supply (UPS) includes a rectifier circuit coupled to an AC input and configured to produce a DC voltage between first and second DC buses, an inverter circuit coupled to the first and second DC buses and configured to produce an AC voltage at the AC output. The UPS further includes an auxiliary power circuit comprising third and fourth DC buses configured to be coupled to a DC power source and third and fourth capacitors coupled between respective ones of the third and fourth DC buses and the neutral and respective first and second switches configured to couple and decouple respective ones of the third and fourth DC buses to and from respective ones of the first and second DC buses. The third and fourth capacitors may have capacitances greater than capacitances of the first and second capacitors.
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