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Power conversion device

  • US 8,754,549 B2
  • Filed: 07/23/2009
  • Issued: 06/17/2014
  • Est. Priority Date: 07/24/2008
  • Status: Expired due to Fees
First Claim
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1. A power conversion device comprising:

  • an inverter circuitincluding a plurality of single-phase inverters which each include at least one semiconductor switch device and a DC voltage source, and which are connected in series at their AC sides, andhaving an AC side connected in series to an output of a DC power supply thereby to superimpose a total sum of outputs of the single-phase inverters onto an output of the DC power supply;

    a smoothing capacitor configured to smooth an output from the inverter circuit which is connected to the inverter circuit in its subsequent stage via a first switch configured to switch between conduction and non-conduction; and

    a shorting switch which has one end connected to the inverter circuit, and the other end connected to a negative terminal of the smoothing capacitor, whereinDC/DC conversion is performed by utilizing charge/discharge of DC power in the inverter circuit, andthe inverter circuit is configured to control each single-phase inverter and the shorting switch such that reception and delivery of electric power of each DC voltage source of each single-phase inverter, is balanced.

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