Combining Signals of Hall Sensor & Rogowski Coil

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SUMMARY

This discussion focuses on the design and implementation of a circuit combining signals from a Hall sensor and a Rogowski coil. The circuit utilizes two operational amplifiers (A1 and A2) to handle different frequency components, with A1 acting as a low-pass integrator for the Hall sensor's DC output and A2 serving as an AC-coupled amplifier for the Rogowski coil. Key parameters include resistor values R1C, R1H, and R2, which determine the amplification levels necessary to achieve a target output voltage of 5V from a 300μV input from four Hall sensors and a 2μV input from the Rogowski coil. The discussion emphasizes the importance of time constants in achieving optimal circuit performance, particularly ensuring that Tv ≥ 100TH, where TH is the Hall sensor's time constant.

PREREQUISITES
  • Understanding of operational amplifier circuits, specifically summing amplifiers.
  • Knowledge of signal processing concepts, including low-pass and high-pass filtering.
  • Familiarity with time constants in electronic circuits and their impact on signal behavior.
  • Basic principles of electromagnetic induction as they relate to Hall sensors and Rogowski coils.
NEXT STEPS
  • Research the design and implementation of summing amplifiers using operational amplifiers.
  • Study the characteristics and applications of Rogowski coils in current measurement.
  • Learn about the HOKA technique for wideband amplifier design and its practical applications.
  • Explore methods for calculating time constants in RC circuits to optimize signal processing.
USEFUL FOR

Electrical engineers, circuit designers, and anyone involved in signal processing or measurement systems utilizing Hall sensors and Rogowski coils will benefit from this discussion.

  • #31
@Glenn Emmers Considering the time/effort expended on this project, a commercially available Rogowski probe that covers your full frequency range should be investigated. Here are some links for wideband ones that may help. (No Hall device needed unless you need DC.)

Some explanation from the Government Printing Office:
(On page 175 et seq. of 428)
https://www.gpo.gov/fdsys/pkg/GOVPU...VPUB-C13-6fc54876ae3cb5ad69ab9d43094650f8.pdf
Here is a link to reference [7] in the above. It is behind a $30 pay wall so I haven't looked at it.
Review of Scientific Instruments 51, 1535 (1980); https://doi.org/10.1063/1.1136119

User Guide:
https://www.keysight.com/main/redir...ey=2925114&lc=eng&cc=US&nfr=-32553.1229528.00

Data Sheet:
https://www.keysight.com/en/pd-2877...23-mhz-3000-a?nid=-32553.1229528&cc=US&lc=eng

Selection Guide:
https://www.keysight.com/en/pc-1000000101:epsg:pgr/oscilloscope-probes?pm=SC&nid=-32564.0&cc=US&lc=eng

("Keysight" used to be "Agilent" used to be "Hewlett Packard")
 
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