Combining Signals of Hall Sensor & Rogowski Coil

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Discussion Overview

The discussion revolves around the design and functionality of a circuit that combines the signals from a Hall sensor and a Rogowski coil. Participants explore the theoretical and practical aspects of the circuit, including component selection and the behavior of the amplifiers involved. The conversation includes technical details about signal processing, time constants, and the integration of multiple sensors.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • Glenn seeks clarification on the purpose of the lower op-amp in the circuit, suggesting it may be a summing amplifier, and asks for guidance on determining various component values.
  • Tom explains that the lower amplifier maintains the output of the upper amplifier centered around the recent average of flux, emphasizing the role of the Hall sensor in detecting DC components.
  • Old Jim elaborates on the AC and DC balance within the circuit, detailing how the components interact to achieve the desired signal processing, and highlights the importance of time constants in the design.
  • Glenn expresses a desire to connect multiple Hall sensors and seeks advice on resistor values and transfer functions for the circuit design, questioning the assumptions about time constants and component selection.
  • Another participant questions the completeness of the information provided and seeks clarification on the roles of various resistors and capacitors in the circuit's transfer function.

Areas of Agreement / Disagreement

Participants generally agree on the roles of the amplifiers and the importance of balancing AC and DC components. However, there is no consensus on the specific values for components or the exact transfer functions needed for the circuit design, indicating multiple competing views and uncertainties in the design process.

Contextual Notes

Participants mention specific time constants and component values, but there are unresolved assumptions regarding the characteristics of the Hall sensor and Rogowski coil, as well as the overall transfer function of the circuit.

Who May Find This Useful

Individuals interested in circuit design, particularly in the context of signal processing from sensors, as well as those exploring the integration of multiple sensor outputs in electronic applications.

  • #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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