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BATTERY TESTER WITH AN IMPROVED LOAD CIRCUIT

  • US 3,848,181 A
  • Filed: 09/18/1973
  • Issued: 11/12/1974
  • Est. Priority Date: 09/18/1973
  • Status: Expired due to Term
First Claim
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1. An electrical load circuit for a battery tester for testing batteries having positive and negative terminals and wherein the load current that is allowed to pass through the battery is sensed and controlled, comprising:

  • a. a plurality of test leads, each lead having attached thereto a terminal battery connector;

    b. reverse current means, associated with one of the test leads, for preventing a reverse flow of current;

    c. a plurality of power transistors, associated with the test leads, said power transistors being connected in parallel to each other and in serieS with the reverse current means;

    d. at least a first bus structure associated with the power transistors;

    e. at least a second bus structure associated with the power transistors and electrically insulated at its one end from the first bus structure and electrically connected through its other end to the first bus structure, the bus structures also being electrically connected to one of the test leads; and

    f. at least two emitter bias resistors being connected at a common point to the emitters of each power transistor, the opposite end of one bias resistor being connected to the first bus and the opposite end of the other bias resistor being connected to the second bus.

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