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Ride-through protection circuit for a voltage source inverter traction motor drive

  • US 5,127,085 A
  • Filed: 04/01/1991
  • Issued: 06/30/1992
  • Est. Priority Date: 04/01/1991
  • Status: Expired due to Term
First Claim
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1. A motor drive apparatus comprising:

  • a source for developing a DC supply voltage across a pair of DC supply terminals;

    inverter means for supplying alternating current to one or more motor windings from a pair of DC load terminals;

    means including a first thyristor for connecting said DC supply terminals to the DC load terminals of said inverter means, the first thyristor being adapted when supplied with a gate signal to enable said source to supply load current to said inverter means;

    a commutation circuit including a second thyristor and commutation capacitor connected in series across said DC supply terminals, the second thyristor being adapted when supplied with a gate signal to divert said current supplied by said source; and

    control means operative in response to a detected fault condition during the supply of load current to said inverter means for interrupting the gate signal supplied to said first thyristor, and supplying a gate signal to said second thyristor, thereby commutating said first thyristor to isolate said source from said inverter means and temporarily maintaining a current path for said source through said second thyristor.

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