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Pulse width modulated inverter for unbalanced and variable power factor loads

  • US 4,507,724 A
  • Filed: 10/17/1983
  • Issued: 03/26/1985
  • Est. Priority Date: 10/17/1983
  • Status: Expired due to Fees
First Claim
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1. In an n-phase inverter for generating polyphase AC power from a DC source having two terminals coupled to the inverter through bus lines, the inverter having rails coupled to the bus lines and outputs connected to a load, the improvement comprising:

  • a first switch connected between one of the bus lines and one of the rails;

    a second switch coupled between the one rail and the other bus line;

    means coupled to the one rail for sensing the direction of current therein, such current being in a particular direction when power developed by the load attempts to return to the DC source; and

    means coupled to the sensing means and to the first and second switches for operating the switches whereby the first switch is opened and the second switch is closed to shunt current through the second switch from the one rail when the current in the one rail flows in the particular direction to thereby prevent such current from being returned to the DC source.

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