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Protection element and method for protecting a circuit

  • US 5,684,663 A
  • Filed: 09/29/1995
  • Issued: 11/04/1997
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Term
First Claim
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1. A protection element for protecting a battery pack having a first battery terminal and a second battery terminal from a faulty condition in a load having a first load terminal and a second load terminal, comprising a first switch, wherein the first switch includes:

  • a first transistor having a control electrode, a first current conducting electrode for coupling to the first battery terminal, and a second current conducting electrode for coupling to the first load terminal;

    a second transistor having a control electrode, a first current conducting electrode coupled to the first current conducting electrode of the first transistor, and a second current conducting electrode coupled to the control electrode of the first transistor;

    a first resistor having a first electrode for coupling to the second battery terminal and to the second load terminal, and a second electrode coupled to the control electrode of the first transistor;

    a second resistor having a first electrode coupled to the second current conducting electrode of the first transistor and a second electrode coupled to the first current conducting electrode of the second transistor; and

    a third resistor having a first electrode coupled to the first electrode of the second resistor and a second electrode coupled to the control electrode of the second transistor.

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