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Inverter circuit

  • US 5,280,228 A
  • Filed: 03/20/1991
  • Issued: 01/18/1994
  • Est. Priority Date: 03/20/1990
  • Status: Expired due to Term
First Claim
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1. A three-phase bridge inverter circuit receiving electric power from a DC power supply and converting the DC power into AC power, comprising:

  • six switching elements constituting said inverter;

    six diodes;

    a drive circuit controlling a conductive state and a cut-off state of said switching elements for different phases;

    a level shift circuit for converting a signal with reference to a low potential side electrode of said DC power supply into a signal with reference to one of main electrodes of the switching elements on a high potential side among said switching elements;

    means for detecting the state of said switching elements; and

    means for detecting the temperature of the inverter circuit;

    wherein at least said six switching elements are isolated from one another by forming them in a semiconductor region isolated by a dielectric body, all of which are formed together in the form of a monolithic IC.

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