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3-Phase High Power UPS

  • US 20080197706A1
  • Filed: 02/21/2007
  • Published: 08/21/2008
  • Est. Priority Date: 02/21/2007
  • Status: Active Grant
First Claim
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1. An uninterruptible power supply (UPS) comprising:

  • a plurality of electrical buses;

    a first AC/DC converter coupled to the electrical buses and configured to receive a first input AC voltage and to convert the first input AC voltage to a plurality of DC voltages, the first AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;

    a second AC/DC converter coupled to the electrical buses and configured to receive a second input AC voltage and to convert the second input AC voltage to the plurality of DC voltages, the second AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;

    a third AC/DC converter coupled to the electrical buses and configured to receive a third input AC voltage and to convert the third input AC voltage to the plurality of DC voltages, the third AC/DC converter being configured to convey the plurality of DC voltages to the plurality of electrical buses;

    a DC/DC converter coupled to the plurality of electrical buses and configured to;

    convert the plurality of DC voltages to a battery DC voltage; and

    convert the battery DC voltage to the plurality of DC voltages;

    a first DC/AC converter coupled to the plurality of electrical buses and configured to receive the plurality of DC voltages and to convert the plurality of DC voltages into a first output AC voltage; and

    a DC bus balancer configured to maintain voltages present on the electrical buses at desired levels, the DC bus balancer being configured to transfer energy between the plurality of electrical buses;

    wherein the first, second, and third AC/DC converters are configured such that the first, second, and third AC/DC converters convey the plurality of DC voltages to the plurality of electrical buses when the first, second, and third input AC voltages are within a predetermined threshold; and

    wherein the DC/DC converter is configured such that the DC/DC converter conveys the plurality of DC voltages to the plurality of the electrical buses when the first, second, and third input AC voltages are not within the predetermined threshold.

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