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Device and process for protection against excessive voltage and/or current in systems having USB connections and the like

  • US 9,153,954 B2
  • Filed: 10/31/2012
  • Issued: 10/06/2015
  • Est. Priority Date: 10/31/2011
  • Status: Active Grant
First Claim
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1. An apparatus for electrically protecting a vehicle diagnostic circuit, comprising:

  • a plurality of electrical conductors, including a first power line, a first ground point, a second ground point, and a first data line, wherein the first data line has a first portion and a second portion;

    a common ground line positioned between the first ground point and the second ground point;

    a first voltage limiting device electrically arranged within a vehicle control interface between an external connection and a vehicle and connected to the first power line, the first ground point, and the first portion of the first data line, the first voltage limiting device having a first Zener diode directly connected to the common ground line; and

    a plurality of current limiting devices, wherein a first current limiting device is electrically connected to the first ground point and to the second ground point, and a second current limiting device is electrically connected to the first portion of the first data line and to the second portion of the first data line.

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