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Battery reversal protection

  • US 4,423,456 A
  • Filed: 11/13/1981
  • Issued: 12/27/1983
  • Est. Priority Date: 11/13/1981
  • Status: Expired due to Fees
First Claim
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1. A polarity reversal protection circuit connectable between a pair of source lines and a pair of load lines comprising:

  • first and second field-effect transistors of a first channel type having their source-drain paths connected in series across said source lines; and

    ,third and fourth field-effect transistors of a second channel type having their source-drain paths connected in series across said source lines and in parallel with the source-drain paths of said first and second transistors; and

    ,wherein the gate electrodes of said first and third transistors are directly coupled together and to only one of said source lines and the gate electrodes of said second and fourth transistors are directly coupled together and to only the other of said source lines; and

    ,one of said load lines is connected to the junction point of the drains of said first and second transistors; and

    ,the other of said load lines is connected to the junction point of the drains of said third and fourth transistors.

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