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Method for operating a charger for a voltage-maintaining device, and an apparatus for carrying out the method

  • US 6,512,349 B1
  • Filed: 08/14/2001
  • Issued: 01/28/2003
  • Est. Priority Date: 08/14/2001
  • Status: Expired due to Fees
First Claim
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1. A method for operating a charger (1) for a voltage-maintaining device (2), in which a rectifier (5), connected to phase inputs (PA;

  • PB;

    PC) via a transformer (3) with an electric AC voltage supply system (4), of the charger (1) is driven by means of a drive signal (S) formed from reference charging voltages (ULA, ref;

    ULB, ref;

    ULC, ref) a charging voltage (ULA;

    ULB;

    ULC) for the corresponding phase (A;

    B;

    C) being generated at each phase input (PA;

    PB;

    PC), and a substantially constant DC voltage (UDC) being generated on the DC voltage side of the rectifier (5), characterized in that each charging voltage (ULA;

    ULB;

    . ULC) is generated in such a way that in the corresponding phase (A;

    B;

    C) a charging current (ILA;

    ILB;

    ILC) is injected in a fashion substantially proportional to a phase system voltage (UNA, UNB;

    UNC) of the corresponding phase (A;

    B;

    C) of the electric AC voltage supply system (4).

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