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Safety arrangement

  • US 5,373,193 A
  • Filed: 07/24/1992
  • Issued: 12/13/1994
  • Est. Priority Date: 07/25/1991
  • Status: Expired due to Fees
First Claim
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1. An ignition circuit for an air-bag, comprisinga series connection of a first switch, a second switch and an igniting squib for an air-bag, the series connection connected between a potential of a power supply and a potential of a ground;

  • a disable means, coupled to the power supply, for disabling the power supply;

    a first safety device, coupled to a first node in the series connection to derive a first potential from the series connection, for activating the disable means for disabling the power supply when the first potential at the first node is less than a first predetermined potential and is greater than a second predetermined potential; and

    a second safety device, comprising a first comparator coupled to a first reference potential and to the first node in the series connection, for activating the disable means for disabling the power supply when the first potential is different from the first reference potential.

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