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

US4973912A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Detlef Kaminski · Kornwestheim, DE
• Bernd-Heinrich Schmitfranz · Eßlingen, DE
• Rolf Adomat · Eriskirch, DE
• Walter Ulke · Stuttgart, DE
• Burkhard Voigt · Mannheim, DE

Key dates

• Filing date: Apr 17, 1989
• Grant date: Nov 27, 1990
• Expiry date: Apr 17, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/2829
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and a device for transmitting and for measuring resistance values, is particularly provided for use in motor vehicles, for the constant control of airbag systems. In the method and device an exciter signal coupled into a secondary-side resonant LCR circuit from the primary side via inductively coupled coils is interrupted, transmitted back to the primary side of the transformer and is there used for determining the resistance value by evaluating the time constant of the exciter response.