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Sensors 2018, 18(7), 2231; https://doi.org/10.3390/s18072231

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

1
Korea Electronics Technology Institute, Gyeonggi 13488, Korea
2
Department of Emerging Materials Science, DGIST, Daegu 42988, Korea
3
Department of Information and Communication Engineering, Kyungsung University, Busan 608-736, Korea
*
Author to whom correspondence should be addressed.
Received: 27 May 2018 / Revised: 7 July 2018 / Accepted: 10 July 2018 / Published: 12 July 2018
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, we propose a high accuracy open-type current sensor with a differential Planar Hall Resistive (PHR) sensor. Conventional open-type current sensors with magnetic sensors are usually vulnerable to interference from an external magnetic field. To reduce the effect of an unintended magnetic field, the proposed design uses a differential structure with PHR. The differential structure provides robust performance to unwanted magnetic flux and increased magnetic sensitivity. In addition, instead of conventional Hall sensors with a magnetic concentrator, a newly developed PHR with high sensitivity is employed to sense horizontal magnetic fields. The PHR sensor and read-out integrated circuit (IC) are integrated through a post-Complementary metal-oxide-semiconductor (CMOS) process using multi-chip packaging. The current sensor is designed to measure a 1 A current level. The measured performance of the designed current sensor has a 16 kHz bandwidth and a current nonlinearity of under ±0.5%. View Full-Text
Keywords: current sensor; high accuracy; magnetic sensor; planar hall resistive (PHR); post-CMOS process; read-out IC (ROIC) current sensor; high accuracy; magnetic sensor; planar hall resistive (PHR); post-CMOS process; read-out IC (ROIC)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Lee, S.; Hong, S.; Park, W.; Kim, W.; Lee, J.; Shin, K.; Kim, C.-G.; Lee, D. High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor. Sensors 2018, 18, 2231.

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