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Power inverter having three or more parallel driven PWM-type power inverting units

  • US 5,852,554 A
  • Filed: 06/12/1997
  • Issued: 12/22/1998
  • Est. Priority Date: 06/12/1996
  • Status: Expired due to Fees
First Claim
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1. A power inverter comprising:

  • three or more PWM-type power inverting units which are so arranged and constructed as to be enabled to be driven in parallel;

    a plurality of integrated interphase reactors , each of which is so arranged and constructed as to synthesize each of the same phase output currents of the respective PWM-type inverting units and supply the synthesized phase output current to a load; and

    a plurality of current balance controllers, each of which is so arranged and constructed as to carry out a retardation correction for a PMW waveform outputted from the respective PWM-type power inverting units in the corresponding phase so that each phase current between the respective PWM-type inverting units is balanced, and wherein each of the integrated interphase reactors includes;

    a magnetic core member having a plurality of juxtaposed leg portions and a plurality of coils, each coil being wound so as to interlink to a corresponding one of the leg portions of the core member, each of same instantaneous polarity indicating terminals of the coils being connected to a corresponding phase output end of each PWM-type inverting unit so that the respective coils operatively generate magnetic fluxes on the juxtaposed leg portions in mutually the same directions in response to output phase currents of the respective PWM-type power inverting units and each of the other terminals thereof being connected together to the load.

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