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Method and circuit arrangement for current measurement

  • US 7,242,177 B2
  • Filed: 08/07/2003
  • Issued: 07/10/2007
  • Est. Priority Date: 08/14/2002
  • Status: Expired due to Fees
First Claim
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1. A method for current measurement through a conductor at a potential which is at a higher value than zero potential, comprising:

  • measuring the voltage drop across a shunt resistance to determine the current value in the form of an analog signal, the shunt resistance being formed by a section of the conductor in which the electrical resistance is increased locally by reducing the cross-section of the conductor;

    converting the analog signal to a digital signal using an analog/digital converter;

    supplying a reference voltage to the analog/digital converter to compensate for a temperature dependence of the shunt resistance, a temperature course of the reference voltage at least approximately corresponding to a temperature course of the shunt resistance; and

    transmitting the digital signal to an evaluation unit which is at ground potential;

    wherein the analog signal is subjected to compression based on a non-linear characteristic of the analog/digital converter, and the digital signal is subjected to expansion after transmission at ground potential.

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