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Hybrid distribution transformer having a power electronic module for controlling input power factor and output voltage

  • US 9,768,704 B2
  • Filed: 02/05/2010
  • Issued: 09/19/2017
  • Est. Priority Date: 02/06/2009
  • Status: Active Grant
First Claim
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1. A hybrid transformer having a primary side for receiving an input voltage and a current from a source and a secondary side for providing an output voltage and a current to a load, the hybrid transformer comprising:

  • a ferromagnetic core;

    a first winding, a second winding and a third winding wound around the core, wherein at least one of the first, second and third windings is a primary winding for connection to the source, and at least one of the first, second and third windings is a secondary winding for connection to the load; and

    ,an AC-AC converter comprising;

    a first switching bridge connected to the first winding such that the first switching bridge receives AC power from the first winding and converts the AC power to DC power;

    a second switching bridge including an output connected to the second winding and structured to receive the converted DC power from the first switching bridge, convert the DC power to AC power, and provide the converted AC power to the load in parallel combination with unconverted AC power from the second winding effective to augment the AC power provided to the load;

    a DC bridge connected between the first and second switching bridges; and

    a controller that controls each of the first and second switching bridges to reduce variations in the output voltage in the event of a change in the input voltage, the controller further controlling the first and second switching bridges to continuously control a power factor on the primary side of the hybrid transformer, the controller configured to disconnect the load from the source by opening the first and second switching bridges when the output current exceeds a predetermined limit or when the input voltage drops below a predetermined limit.

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