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Power sharing switching circuit

  • US 5,227,666 A
  • Filed: 12/17/1990
  • Issued: 07/13/1993
  • Est. Priority Date: 12/17/1990
  • Status: Expired due to Fees
First Claim
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1. A power selection system comprising:

  • (A) at least one D.C. power source (18) having an output terminal (32);

    (B) a common terminal (26);

    (C) at least one first switching means (30) coupled between said output terminal (32) and said common terminal (26) and responsive to a first signal for connecting between said output terminal and said common terminal and responsive to a second signal for effecting a disconnection between said output terminal and said common terminal;

    (D) second switching means (72, 50,

         42) responsive to the electrical state of said output terminal and a signal source for providing said first signal to said first switching means;

    (E) said signal source (68, 52,

         62) comprising third switching means (68,

         52) responsive to the signal state of said common point (26) for providing a power level from said source to said second switching means, the power level provided to said second switching means decreasing as the voltage at said common terminal increases, whereby said first switching means (30) effects said connection between said output terminal and said common terminal; and

    (F) unidirectional flow means (55) connected across said first switching means (30) and poled to conduct current flow in the same direction as said first switching means but having a voltage drop significantly greater than said first switching means, said unidirectional current flow means providing biasing power to said second and third switching means prior to conductive operation of said first switching means and in the absence of any initial potential on said common point.

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