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METHOD AND APPARATUS FOR DETECTING A SHORT CIRCUIT

  • US 20110221449A1
  • Filed: 03/03/2011
  • Published: 09/15/2011
  • Est. Priority Date: 03/09/2010
  • Status: Active Grant
First Claim
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1. An apparatus for detecting a short-circuit occurring between a signal line (120) and a ground line (130) of a lead wire (110), comprising:

  • a circuit (140) having an output terminal (170), an input terminal (190) and ground, the ground (180) of the circuit (140) being connected to one end of the ground line (130), the other end of the ground line (130) being disconnected;

    a resistive element (150) having a first terminal connected to the output terminal (170) of the circuit (140) and a second terminal connected to one end of the signal line (120), the other end of the signal line (120) being disconnected;

    wherein the circuit (140) is configuredto provide a first voltage via the output terminal (170) and obtain a second voltage via the input terminal (190), the input terminal (190) being connected to a joint (160) of the signal line (120) and the resistive element (150),to provide a third voltage via the output terminal (170) and obtain a fourth voltage via the input terminal (190),to derive an impedance of the lead wire (110) from the first voltage, the second voltage, the third voltage, the fourth voltage and an impedance of the resistive element (150), andto determine whether a short-circuit occurs or not, based on the derived impedance of the lead wire (110) and a predefined impedance.

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