Inductively coupled sensor/actuator system for digital closed-loop control applications at high operating temperatures

  • Authors:

  • Armin Kiefer;Leonhard M. Reindl

  • Affiliations:

  • Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany;Department of Microsystems Engineering (IMTEK), University of Freiburg, Freiburg, Germany

  • Venue:
  • CISST'08 Proceedings of the 2nd WSEAS International Conference on Circuits, Systems, Signal and Telecommunications
  • Year:
  • 2008

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Abstract

This paper presents a sensor/actuator system for high-temperature applications with the complete measurement electronics and sensors integrated into the actuator. The data transmission is implemented as point-to-point Power Line Communication (PLC), between the sensor/actuator system and its control unit. A separable transformer serves as an inductively coupled contactless connector for both power and bidirectional PLC-data, allowing for a perfect hermetic seal. We discuss the increased requirements for the measurement electronics at high operating temperatures and we present a special ratiometric self-calibration technique to eliminate temperature drifts that is also suitable for integration into an Application Specific Integrated Circuit (ASIC).