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Power transistor module wiring structure

  • US 5,616,955 A
  • Filed: 04/22/1994
  • Issued: 04/01/1997
  • Est. Priority Date: 04/23/1993
  • Status: Expired due to Term
First Claim
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1. A power transistor module comprising:

  • a circuit substrate;

    at least one pair of power transistor chips on the circuit substrate, respectively comprising a first (Tr1) and a second (Tr2) power transistor electrically interconnected in series as upper and lower arms of a bridge circuit;

    first (D1) and second (D2) freewheel diodes connected antiparallel to the first (Tr1) and second (Tr2) power transistor, respectively;

    separate first and second circuit patterns on the circuit substrate for the respective first (Tr1) and second (Tr2) power transistors, the first circuit pattern comprising a first emitter pattern and the second circuit pattern comprising a second collector pattern;

    first (C1), second (C2E1) and third (E2) output terminals, and first (G1) and second (G2) gate terminals taken out from the first and second circuit patterns;

    a bridge shaped internal connecting terminal interconnecting the first emitter pattern and the second collector pattern; and

    a signal terminal (e1) connected to the internal connecting terminal as an auxiliary emitter terminal, at a point at which a desired internal wiring inductance is provided between the internal connecting terminal and the first emitter pattern.

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