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Semiconductor module for a power conversion device

  • US 5,801,936 A
  • Filed: 06/07/1995
  • Issued: 09/01/1998
  • Est. Priority Date: 12/20/1990
  • Status: Expired due to Term
First Claim
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1. A power conversion device having a predetermined number of phases comprising:

  • an intermediate node at a potential intermediate between potentials of a pair of d.c. terminals;

    a.c. terminals equal in number to the number of phases of the power conversion device;

    a plurality of arms each connected between one of said d.c. terminals and one of said a.c. terminals, each of said arms comprising two parallel circuits connected in series, each parallel circuit including a switching device and a diode opposite in conductive direction to said switching device; and

    a plurality of diodes each connected between said intermediate node and a node between said two parallel circuits,wherein different lifetimes are set for said switching device and said diode of each of said parallel circuits to decrease power loss in the power conversion device,wherein lifetimes of said diodes and said switching devices are set to equalize recovery losses and forward voltage losses for said diodes, or switching losses and on-state voltage losses for said switching devices in the power conversion device.

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