Anti-Interference Current Sensing with Enhanced Sensitivity Based on Magnetoresistive Sensors

Liu, J; Lee, CK; Pong, PWT

Anti-Interference Current Sensing with Enhanced Sensitivity Based on Magnetoresistive Sensors

Liu, J Lee, CK Pong, PWT

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Publisher:: Institute of Electrical and Electronics Engineers (IEEE)
Publication Type:: Journal Article
Citation:: IEEE Transactions on Instrumentation and Measurement, 2024, 73, pp. 1-10
Issue Date:: 2024-01-01

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Field	Value	Language
dc.contributor.author	Liu, J
dc.contributor.author	Lee, CK
dc.contributor.author	Pong, PWT
dc.date.accessioned	2024-09-13T04:09:57Z
dc.date.available	2024-09-13T04:09:57Z
dc.date.issued	2024-01-01
dc.identifier.citation	IEEE Transactions on Instrumentation and Measurement, 2024, 73, pp. 1-10
dc.identifier.issn	0018-9456
dc.identifier.issn	1557-9662
dc.identifier.uri	http://hdl.handle.net/10453/180812
dc.description.abstract	Medium-voltage (MV) power converts have various intended applications in renewable energy resources integration, power substations, and electrical mobility. The high power and high switching frequency of MV power converters have necessitated the development of a contactless current sensing technique based on magnetoresistive (MR) sensors to provide galvanic isolation, wide bandwidth, and minimum stray inductive on the current path. The prevailing solution involves placing the MR sensor under a straight printed circuit board (PCB) trace. However, this setup suffers reduced sensitivity due to sensor installation errors and inaccurate measurement owing to the nearby interfering conductors. To address these two issues, a double circular PCB trace is proposed to replace the traditional straight PCB trace. In the proposal, two MR sensors are encircled by a circular PCB trace separately. The interference impact is mitigated by subtracting the differential output from the sensors. Additionally, the double circular trace (DC trace) is optimally designed to enhance the position tolerance of sensor installation by providing a uniform magnetic field within the sensing area. The experiment measurement under a 2 mm position error shows that the proposed method improves the sensitivity from 0.1736 V/A in the conventional straight trace to 0.5902 V/A. Moreover, the sensitivity remains consistent even in the presence of interfering conductors.
dc.language	en
dc.publisher	Institute of Electrical and Electronics Engineers (IEEE)
dc.relation.ispartof	IEEE Transactions on Instrumentation and Measurement
dc.relation.isbasedon	10.1109/TIM.2024.3427827
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0299 Other Physical Sciences, 0906 Electrical and Electronic Engineering
dc.subject.classification	Electrical & Electronic Engineering
dc.subject.classification	4006 Communications engineering
dc.subject.classification	4008 Electrical engineering
dc.subject.classification	4009 Electronics, sensors and digital hardware
dc.title	Anti-Interference Current Sensing with Enhanced Sensitivity Based on Magnetoresistive Sensors
dc.type	Journal Article
utslib.citation.volume	73
utslib.for	0299 Other Physical Sciences
utslib.for	0906 Electrical and Electronic Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2024-09-13T04:09:55Z
pubs.publication-status	Published
pubs.volume	73

Abstract:

Medium-voltage (MV) power converts have various intended applications in renewable energy resources integration, power substations, and electrical mobility. The high power and high switching frequency of MV power converters have necessitated the development of a contactless current sensing technique based on magnetoresistive (MR) sensors to provide galvanic isolation, wide bandwidth, and minimum stray inductive on the current path. The prevailing solution involves placing the MR sensor under a straight printed circuit board (PCB) trace. However, this setup suffers reduced sensitivity due to sensor installation errors and inaccurate measurement owing to the nearby interfering conductors. To address these two issues, a double circular PCB trace is proposed to replace the traditional straight PCB trace. In the proposal, two MR sensors are encircled by a circular PCB trace separately. The interference impact is mitigated by subtracting the differential output from the sensors. Additionally, the double circular trace (DC trace) is optimally designed to enhance the position tolerance of sensor installation by providing a uniform magnetic field within the sensing area. The experiment measurement under a 2 mm position error shows that the proposed method improves the sensitivity from 0.1736 V/A in the conventional straight trace to 0.5902 V/A. Moreover, the sensitivity remains consistent even in the presence of interfering conductors.

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http://hdl.handle.net/10453/180812