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Power converter and vehicle driving system

  • US 10,148,166 B2
  • Filed: 08/28/2014
  • Issued: 12/04/2018
  • Est. Priority Date: 08/28/2014
  • Status: Active Grant
First Claim
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1. A power converter comprising:

  • a power converting unit including a switching element, the power converting unit converting DC power into AC power; and

    a control unit including a modulated-wave generating unit to generate a modulated wave synchronized with an output voltage command of the power converting unit and a carrier-wave generating unit to output a carrier wave having a frequency higher than a frequency of the modulated wave, the control unit controlling the power converting unit by comparing the modulated wave and the carrier wave to output a switching signal for driving the switching element, whereinwhen a modulation factor in converting the DC power into the AC power is equal to or higher than a mode switching modulation factor and is lower than π

    /4, the power converting unit converts the DC power into the AC power in an over-modulation mode, in which switching of the switching element is stopped for a period longer than one cycle of the carrier wave and a ratio of the first period in one cycle of the AC output voltage increases as the modulation factor increases, in a first period in which an AC output voltage is positive and timing of a positive peak value of the AC output voltage is included.

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