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Power conditioning unit with voltage converters

  • US 8,971,082 B2
  • Filed: 01/23/2013
  • Issued: 03/03/2015
  • 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 a mains utility supply, the power conditioning unit comprising:

  • input connection means for connecting to the dc power source;

    output connection means for connecting to the mains utility supply;

    voltage increasing means for increasing a voltage supplied by the dc power source to the input connection means;

    voltage reducing means for reducing a voltage supplied by the voltage increasing means;

    dc-to-ac conversion means for converting a direct current supplied by the voltage reducing means to an alternating current suitable for supplying to the mains utility supply, wherein the voltage reducing means and the dc-to-ac conversion means share an inductor and wherein the inductor is configured to function as an energy storage inductor in the voltage reducing means and as a current smoothing inductor in the dc-to-ac conversion means;

    voltage sensing means for sensing a voltage on the output connection means;

    reference current generation means for generating a reference current responsive to said sensing;

    current sensing means for sensing a supply current in the dc-to-ac conversion means; and

    control means for controlling the voltage reducing means responsive to a difference between the reference current and the supply current.

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