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High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor.

Sungho Lee1, Sungmin Hong2, Wonki Park3

  • 1Korea Electronics Technology Institute, Gyeonggi 13488, Korea. slee@keti.re.kr.

Sensors (Basel, Switzerland)
|July 14, 2018
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Summary
This summary is machine-generated.

This study introduces a novel open-type current sensor utilizing a differential Planar Hall Resistive (PHR) sensor for enhanced accuracy. The design minimizes external magnetic field interference, offering robust performance for precise current measurements.

Keywords:
current sensorhigh accuracymagnetic sensorplanar hall resistive (PHR)post-CMOS processread-out IC (ROIC)

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Conventional open-type current sensors are susceptible to external magnetic field interference.
  • Existing designs often lack robustness against unintended magnetic flux, impacting measurement accuracy.

Purpose of the Study:

  • To develop a high-accuracy open-type current sensor resistant to external magnetic fields.
  • To improve the magnetic sensitivity and robustness of open-type current sensors.

Main Methods:

  • Implementation of a differential structure using Planar Hall Resistive (PHR) sensors.
  • Integration of the PHR sensor and read-out integrated circuit (IC) via a post-Complementary metal-oxide-semiconductor (CMOS) process.
  • Utilizing multi-chip packaging for sensor integration.

Main Results:

  • The differential structure demonstrates robust performance against unwanted magnetic flux.
  • The proposed sensor achieves a 16 kHz bandwidth and high sensitivity.
  • Achieved current nonlinearity is below ±0.5% for a 1 A current level.

Conclusions:

  • The differential PHR sensor offers a high-accuracy and robust solution for open-type current sensing.
  • The integrated PHR sensor and IC provide a reliable method for measuring small current levels.
  • This technology advances the field of magnetic field sensing for current measurement applications.