• Title/Summary/Keyword: Hall Effect current sensor

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Lifetime estimation for current sensor by accelerated life test (가속수명시험을 통한 전류센서의 수명 예측)

  • Kim, Je-Min;Choi, Sung-Soon;Ma, Byung-Jin;Lee, Kwan-Hun;Song, Byeong-Suk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.11a
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    • pp.257-258
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    • 2008
  • Hall-type current sensors have been widely used in many fields such as elevator and train system. To estimate lifetime of hall-type current sensors, an accelerated life test with real-time monitoring system simultaneously was designed and performed in high temperature environment with three different temperatures. From the experimental results, activation energy was about 0.9 eV, and acceleration factor was about 450 based on Arrhenius model. As a results, $B_{10}$ lifetime of hall-type current sensor is estimated to be 65,460 hours.

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DIFFUSION CURRENT EFFECT ON THE HALL COEFFICIENT IN A MAGNETIC FIELD SENSOR (자기센서내에서 확산 전류가 홀 계수에 미치는 영향)

  • Lee, Seung-Ki;Kang, Uk-Song;Oh, Kwang-Hoon;Jhun, Kuk-Jin;Han, Min-Koo
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.187-190
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    • 1991
  • The analytical model to investigate the effects of the drift and diffusion carrier transport upon the Hall effect is presented and applied to the general PN junction structure. The diffusion current effect on the Hall coefficient can not be considered in the conventional model, which produces the conversion of the direction of the induced Hall field between measured and calculated values. The proposed analytical model which considers the diffusion current effect provides the coincident results with the previous experimental results.

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Magnetic Sensitivity Improvement of 2-Dimensional Silicon Vertical Hall Device (2 차원 Si 종형 Hall 소자의 자기감도 개선)

  • Ryu, Ji-Goo
    • Journal of Sensor Science and Technology
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    • v.23 no.6
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    • pp.392-396
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    • 2014
  • The 2-dimensional silicon vertical Hall devices, which are sensitive to X,Y components of the magnetic field parallel to the surface of the chip, are fabricated using a modified bipolar process. It consists of the thin p-layer at Si-$SiO_2$ interface and n-epi layer to improve the sensitivity and influence of interface effect. Experimental samples are a sensor type K with and type J without $p^+$ isolation dam adjacent to the center current electrode. The results for both type show a more high sensitivity than the former's 2-dimensional vertical Hall devices and a good linearity. The measured non-linearity is about 0.8%. The sensitivity of type J and type K are about 66 V/AT and 200 V/AT, respectively. This sensor's behavior can be explained by the similar J-FET model.

Development of Position Sensor Detection Circuit using Hall Effect Sensor (Hall Effect Sensor를 이용한 위치센서 검출회로개발)

  • Jeong, Sungin
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.21 no.2
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    • pp.143-149
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    • 2021
  • BLDC motors are getting better performance due to the improvement of material technology including high performance of permanent magnets, advancement of driving IC technology with high integration and high functionality, and improvement of assembly technology such as high point ratio. While having the advantage of such a square wave driven BLDC motor, interest in the design and development of a square wave driven BLDC permanent magnet motor and development of a position detection circuit and driver is increasing in order to more meet the needs of users. However, in spite of the cost and functional advantages due to reduced efficiency, switching loss and vibration, noise, etc., the application is somewhat limited. Therefore, in this paper, we study a position detection circuit that generates a sinusoidal signal in proportion to the magnetic flux of a BLDC motor rotor using a Hall Effect Sensor that generates a sinusoidal wave to increase the efficiency of the motor, reduce ripple, and drive a sinusoidal current with excellent speed and torque characteristics.

Implementation of Low Noise Current Sensor using Low Pass FIR Filter (저역통과 FIR필터를 이용한 저잡음 전류 센서 구현)

  • Kim, Jeong-Hwan;Lee, Seong-Jin;Choi, Yong-geon;Han, Seong-Gye;Kwon, Se-Ik;Kim, Nam-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.05a
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    • pp.499-502
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    • 2017
  • The needs of efficient electricity use and current measurement for electrical safety have been increased. Hence, the current sensor is used, especially non-contact current sensor which can measure the current without blocking the circuit using hall effect. However, the accurate measuring of the current sensor is inhibited due to the inflow of various noises in this current sensor. In this article, a stronger current sensor against the noise is proposed using low pass FIR filter to the existing current sensor. FIR filter was designed to block the range over the certain frequency at the output of the current sensor to eliminate the external noises, and so on. As a result, more accurate and close measurements were possible.

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Magnetic Properties of InSb Hall Devices (InSb 출소자의 자기적 특성)

  • 이우선;최권우;조준호;정용호;김상용
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2000.11a
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    • pp.49-52
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    • 2000
  • In the current development of magnetic sensors based on the Hall effect, the following two approaches can be distinguished. The first, one tries to build better sensor based on conventional Hall devices. The innovations come through a better understand of the details If the operating principle and secondary effects, and through the application If ever-improving microelectronics technology. In the second approach, one hopes to build better sensors by making use of the Hall effect in active devices, such as magneto-transistors and MAGFET. In this paper, we study magnetic properties of Hall device fabricated with series and parallel multilayers.

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Magnetic Properties of InSb Hall Devices (InSb 홀소자의 자기적 특성)

  • 이우선;최권우;조준호;정용호;김상용;서용진;김남오
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.49-52
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    • 2000
  • In the current development of magnetic sensors based on the Hall effect, the following two approaches can be distinguished. The first, one tries to build better sensor based on conventional Hall devices. The innovations come through a better understand of the details if the operating principle and secondary effects, and through the application if ever-improving microelectronics technology. In the second approach, one hopes to build better sensors by making use of the Hall effect in active devices, such as magneto-transistors and MAGFET. In this paper, we study magnetic properties of Hall device fabricated with series and parallel multilayers.

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Position Correction Method for Misaligned Hall-Effect Sensor of BLDC Motor using BACK-EMF Estimation (역기전력 추정법을 이용한 브러시리스 직류 전동기의 홀센서 상전류 전환시점 보상 방법)

  • Park, Je-Wook;Kim, Jong-Hoon;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.3
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    • pp.246-251
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    • 2012
  • This paper proposes a new position compensation method for misaligned Hall-effect sensors of BLDCM(Brushless DC Motor). If the Hall-effect sensors are installed at wrong position, the exact rotor position cannot be obtained. Therefore, when the BLDCM is controlled with this wrong position, the torque ripple can be increased and the average torque also decreases. The back-EMF of BLDCM can be obtained by using the voltage equation and by multiplying the back-EMF constant and rotor speed. At a constant speed, the estimated back-EMF by using the multiplication of the back-EMF constant and rotor speed is constant, but the estimated back-EMF from the voltage equation decreases at the commutation point because the line-to-line back-EMF of two conducting phases is start to decrease at this point. Therefore, by using the difference between these two estimated back-EMFs, the commutation point of the phase current can be determined and position compensation can be carried out. The proposed position correction method doesn't require additional hardware circuit and can be easily implemented. The validity of the proposed position compensation method is verified through several experiments.

Design and fabrication of a 300A class general-purpose current sensor (300A급 일반 산업용 전류센서의 설계 및 제작)

  • Park, Ju-Gyeong;Cha, Guee-Soo;Ku, Myung-Hwan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.6
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    • pp.1-8
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    • 2016
  • Current sensors are used widely in the fields of current control, monitoring, and measuring. They have become more popular with the increasing demand for smart grids in a power network, generation of renewable energy, electric cars, and hybrid cars. Although open loop Hall effect current sensors have merits, such as low cost, small size, and weight, they have low accuracy. This paper describes the design and fabrication of a 300A open loop current sensor that has high accuracy and temperature performance. The core of the current sensor was calculated numerically and the signal conditioning circuits were designed using circuit analysis software. The characteristics of the manufactured open loop current sensor of 300 A class was measured at currents up to 300 A. According to the test of the current sensor, the accuracy error and linearity error were 0.75% and 0.19%, respectively. When the temperature compensation was carried out with the relevant circuit, the temperature coefficients were less than $0.012%/^{\circ}C$ at temperatures between $-25^{\circ}C$ and $85^{\circ}C$.

Development and Performance Test of DC Smart Metering System for the DC Power Measurement of Urban Railway (도시철도 직류 전력량 계측을 위한 직류용 스마트미터링 시스템 개발 및 성능시험)

  • Jung, Hosung;Shin, Seongkuen;Kim, Hyungchul;Park, Jongyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.5
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    • pp.713-718
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    • 2014
  • DC urban railway power system consists of DC power network and AC power network. The DC power network supplies electric power to railway vehicles and the AC power network supplies electric power to station electric equipment. Recently, because of power consumption reduction and peak load shaving, intelligent measurement of regenerative energy and renewable energy adapted on DC urban railway is required. For this reason, DC smart metering system for DC power network shall be developed. Therefore, in this paper, DC voltage sensor, current sensor, and DC smart meter were developed and evaluated by performance test. DC voltage sensor was developed for measuring standard voltage range of DC urban railway, and DC current sensor was developed as hall effect split core type in order to install in existing system. DC smart meter possesses function of general intelligent electric power meter, such as measuring electricity and wireless communication etc. And, DC voltage sensor showed average 0.17% of measuring error for 2,000V/50mA, and current sensor showed average 0.21% of measuring error for ${\pm}2,000V/{\pm}4V$ in performance test. Also DC smart meter showed maximum 0.92% of measuring error for output of voltage sensor and current sensor. In similar environment for real DC power network, measuring error rate was under 0.5%. In conclusion, accuracy of DC smart metering system was confirmed by performance test, and more detailed performance will be verified by further real operation DC urban railway line test.