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Single phase redundant power supply systems for reducing phase current imbalances

  • US 9,891,679 B2
  • Filed: 12/22/2011
  • Issued: 02/13/2018
  • Est. Priority Date: 12/22/2011
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a first AC/DC power supply having an input coupled to a first phase voltage in a polyphase power distribution system, and an output coupled to a load for supplying an amount of DC power to the load;

    a second AC/DC power supply having an input for coupling to a second phase voltage in the polyphase power distribution system, and an output coupled to the load for supplying an amount of DC power to the load; and

    a controller for controlling one of the first AC/DC power supply and the second AC/DC power supply;

    wherein the output of the first AC/DC power supply is coupled in parallel with the output of the second AC/DC power supply; and

    wherein the controller is configured to reduce phase current imbalances in the polyphase power distribution system by adjusting the amount of DC power supplied to the load by the first AC/DC power supply and the amount of DC power supplied to the load by the second AC/DC power supply so the amount of DC power supplied to the load by the first AC/DC power supply is different than the amount of DC power supplied to the load by the second AC/DC power supply when the number of power supplies per phase of the polyphase power distribution system is the same.

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