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Power conditioning unit with voltage converters

  • US 9,831,794 B2
  • Filed: 09/13/2016
  • Issued: 11/28/2017
  • Est. Priority Date: 11/08/2004
  • Status: Active Grant
First Claim
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1. A power conditioning unit for delivering power from a DC power source to an AC grid, the power conditioning unit comprising:

  • a plurality of input terminals for connecting to the DC power source;

    a plurality of output terminals for connecting to the AC grid;

    a DC-DC converter connected to the plurality of input terminals for converting a voltage at the plurality of input terminals to a voltage above an AC grid voltage;

    a DC link connected to an output of the DC-DC converter;

    a current control circuit connected to the DC link, the current control circuit comprising a switch and an inductor;

    a DC-AC converter connected to an output of the current control circuit;

    a reference current generating circuit that generates a sinusoidal reference current synchronized to the AC grid based on an output voltage of the DC-AC converter; and

    a controller that turns the switch on, allowing current to flow, when an output current from the inductor is lower than the sinusoidal reference, and turns the switch off when the output current from the inductor is higher than the sinusoidal reference.

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