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Method for contactless measurement of a resistance arranged in the secondary circuit of a transformer and device for carrying out the method

  • US 4,973,912 A
  • Filed: 04/17/1989
  • Issued: 11/27/1990
  • Est. Priority Date: 04/15/1988
  • Status: Expired due to Fees
First Claim
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1. Method for the contactless measuring of a resistance arranged in a secondary circuit of a transformer with inductively coupled coils having a primary and secondary side in a motor vehicle, comprising the steps of:

  • exciting a resonant circuit, which is connected to a resistance to be measured on the secondary side of the transformer, by an excitation signal from a primary side of the transformer,interrupting the excitation signal,sensing a decaying excitation response at the primary side anddetermining, as a function of time constant of the decaying excitation response sensed at the primary side, a value of the resistance to be measured.

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