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Three level power converting apparatus having means for balancing DC component thereof

  • US 5,627,742 A
  • Filed: 09/01/1994
  • Issued: 05/06/1997
  • Est. Priority Date: 09/01/1993
  • Status: Expired due to Term
First Claim
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1. A power converting apparatus comprising:

  • a plurality of capacitors connected in series across a DC voltage source, converter for converting DC voltages supplied from the capacitors to an AC phase voltage having three potentials, including a positive, zero, and negative potential, andzero-voltage adjuster for adjusting a zero-voltage duration of the AC phase voltage on a basis of an output current polarity of the power converting apparatus and a value representing a voltage difference between the voltages of the capacitors connected in series so as to balance the voltages.

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