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Multilevel inverter device and method

  • US 9,806,529 B2
  • Filed: 07/28/2016
  • Issued: 10/31/2017
  • Est. Priority Date: 05/10/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • providing an inverter comprising;

    a first boost apparatus having an input coupled to a positive dc bus;

    a second boost apparatus having an input coupled to a negative dc bus;

    a first switch coupled to an input of an L-C filter and the first boost apparatus;

    a second switch coupled to the input of the L-C filter and the second boost apparatus;

    a third switch coupled between the positive dc bus and the first switch, wherein an output of the first boost apparatus is directly connected to a common node of the first switch and the third switch;

    a fourth switch coupled between the negative dc bus and the second switch, wherein an output of the second boost apparatus is directly connected to a common node of the second switch and the fourth switch; and

    an isolation switch coupled between the input of the L-C filter and ground;

    during a first time period of a half switching cycle, switching a voltage at the input of the L-C filter back and forth between the positive dc bus and ground;

    during a second time period of the half switching cycle, switching the voltage at the input of the L-C filter back and forth between an output voltage of the first boost apparatus and ground in at least two consecutive switching pulses; and

    during a third time period of the half switching cycle, switching the voltage at the input of the L-C filter back and forth between the positive dc bus and ground, wherein the second time period is between the first time period and the third time period.

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