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Uninterruptible power supply capable of providing sinusoidal-wave output AC voltage

  • US 7,619,323 B2
  • Filed: 10/30/2006
  • Issued: 11/17/2009
  • Est. Priority Date: 04/21/2006
  • Status: Active Grant
First Claim
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1. An uninterruptible power supply for providing a sinusoidal-wave output AC voltage, comprising:

  • a battery pack;

    a DC/DC converter unit coupled to the battery pack for converting a DC voltage provided by the battery pack into a full-wave rectified DC voltage; and

    an inverter coupled to the DC/DC converter unit for converting the full-wave rectified DC voltage into a sinusoidal-wave output AC voltage;

    wherein the DC/DC converter unit comprises a plurality of DC/DC converters having a plurality of input terminals and output terminals, and wherein the plurality of input terminals of the plurality of DC/DC converters are connected in parallel to the battery pack and the plurality of output terminals of the plurality of DC/DC converters are connected in series to the inverter, and wherein each DC/DC converter is configured to convert the DC voltage provided by the battery pack into an output voltage such that the output voltages of the plurality of DC/DC converters are summed up to form the full-wave rectified DC voltage;

    wherein the plurality of DC/DC converters include a first DC/DC converter and a second DC/DC converter, wherein one of the first DC/DC converter and the second DC/DC converter is configured to perform switching regulation with a variable duty cycle and the other DC/DC converter is configured to perform switching regulation with a fixed duty cycle, and wherein the first DC/DC converter is an isolated DC/DC converter which has a transformer and the second DC/DC converter is a non-isolated converter.

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