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Multiple battery switchover circuits

  • US 5,764,032 A
  • Filed: 03/06/1997
  • Issued: 06/09/1998
  • Est. Priority Date: 03/06/1997
  • Status: Expired due to Term
First Claim
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1. A multiple battery switchover circuit comprising:

  • a first source of power;

    a second source of power;

    a load;

    and in plurality;

    first, second and third field effect transistors, each having a substrate, a control gate, a source electrode and a drain electrode, the substrate of each field effect transistor being electrically coupled to one of the electrodes of the respective field effect transistor, the substrate and the other electrode of each field effect transistor forming a parasitic body diode electrically coupled between the two electrodes of the respective field effect transistor, the parasitic body diode being electrically conductive when a first of the two electrodes is at a higher voltage than a second of the two electrodes and being substantially nonconductive when the first of the two electrodes is at a lower voltage than the second of the two electrodes;

    first electrode of the first, second and third field effect transistors being coupled together;

    second electrode of the first field effect transistor being coupled to the load and to the first source of power;

    second electrode of the second field effect transistor being coupled to the second source of power;

    second electrode of the third field effect transistor being adapted for coupling to a respective battery.

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