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Incremental base drive circuit for a power transistor

  • US RE33,378 E
  • Filed: 05/15/1989
  • Issued: 10/09/1990
  • Est. Priority Date: 10/14/1983
  • Status: Expired due to Fees
First Claim
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1. A base drive circuit for a power transistor having base, collector and emitter elements and a load circuit connected in series with the collector and emitter elements, comprising:

  • a source of control signal which represents an operating current level of said transistor wherein said control signal is a digital signal;

    a plurality of discrete current sources for providing increments of base current to the base element of said transistor; and

    means responsive to said control signal for connecting a controlled number of said discrete current sources with the base element of said transistor to provide the desired base current dependent on the operating current level.

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