POWER CONVERSION EQUIPMENT

  • US 20110025236A1
  • Filed: 07/27/2010
  • Published: 02/03/2011
  • Est. Priority Date: 07/31/2009
  • Status: Active Grant
First Claim
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1. Power conversion equipment comprising:

  • a first DC power supply, the first DC power supply comprisingan electric power feeding section,an electric power input section, for receiving electric power fed fromthe electric power feeding section, anda DC electric power converting section for converting the electric power fed to the electric power input section to DC electric power;

    a second DC power supply comprising a capacitor connected in parallel to the first DC power supply;

    a smoothing circuit section for smoothing the DC electric power fed from the first DC power supply and DC electric power fed from the second DC power supply;

    an electric power converting section connected to the smoothing circuit section, the electric power converting section for converting the DC electric power to multiphase AC electric power and feeding the converted multiphase AC electric power to a multiphase AC motor;

    a first short-circuit section comprising a first switch inserted therein, the first switch being disposed between a multiphase AC output point of the electric power input section in the first DC power supply and a multiphase AC output point of the electric power converting section;

    a second short-circuit section comprising a second switch inserted therein, the second switch being disposed between at least one of the electric power feeding section and the electric power input section in the first DC power supply or the multiphase AC output point of the electric power converting section and the multiphase AC motor; and

    a switch control section, the switch control section for controlling the first switch and the second switch for preventing the first switch and the second switch from being closed simultaneously.

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