Design and Simulation of a magnetic balance weak current sensor based on TMR

sensor used in DC ground fault detection system according to measurement method can be divided into low frequency AC signal detecting and DC signal detecting of leakage current . It greatly affect the accuracy of the earth fault signal because of the existence of capacitance in the detecting of low frequency AC signal and it doesnt have online measurement DC current sensor in the market when we want to measure load leakage current. Caliper DC ammeter cant meet the requirements in DC system ground fault diction in terms of resolution, accuracy, range, on-line installation and on-line measurement.

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Theoretical analysis of novel weak current sensor using FeCuNbSiB single nanocrystalline toroidal core and double-winding

Frontiers of Mechanical Engineering in China ◽

10.1007/s11465-006-0054-7 ◽

2006 ◽

Vol 1 (4) ◽

pp. 439-442

Author(s):

Bing-hao Bao ◽

Da-qi Zhu ◽

Jian-ning Ding ◽

Chang-sheng Li

Keyword(s):

Theoretical Analysis ◽

Current Sensor ◽

Weak Current

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Semiconductor Magnetoresistive Current Sensor for Weak Current Detection

Electronics Science Technology and Application ◽

10.18686/esta.v2i1.5 ◽

2015 ◽

Vol 2 ◽

pp. 23

Author(s):

Qi Zhou

Keyword(s):

Effect Of Temperature ◽

Current Sensor ◽

Semiconductor Film ◽

Operating Characteristics ◽

Weak Current ◽

Temperature Drift ◽

Coupling Capacitance ◽

Current Detection ◽

The Magnetic Field ◽

Resistance Value

<p>Made up by the combination of InSb-In eutectic magnetoresistive (MR) components, the newly designed semiconductor film magnetoresistive current sensor (MRCS) was to detect weak current with its circuit controlled by signals. This kind of current sensor simultaneously alters the resistance value of two InSb-In magnetoresistive components. Through this way, it could eliminate the coupling capacitance of ultra-large capacity and reduce the volume capacity as well as improve the frequency characteristics. Set a specified parameter through accurate calculation, and make current generate signals which form direct proportion against the magnetic field generated by the weak current of magnetoresistive alteration, reaching the goals of detecting weak current. The test analyzed this current sensor’s operating characteristics with the testing pass bands as 7-1800 Hz. It was found that the weak current reached at 10 mA and could control the effect of temperature drift effectively.</p>

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RESEARCH ON TEMPERATURE COMPENSATION FOR MAGNETIC BALANCE CURRENT SENSOR

Material Engineering and Mechanical Engineering ◽

10.1142/9789814759687_0106 ◽

2016 ◽

Author(s):

Li-Heng Wang ◽

Zhi-Hui Chen

Keyword(s):

Temperature Compensation ◽

Current Sensor ◽

Magnetic Balance

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Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

Light & Engineering ◽

10.33383/2018-70 ◽

2020 ◽

pp. 99-107

Author(s):

Erdal Sehirli

Keyword(s):

Integrated Circuit ◽

Closed Loop ◽

Input Voltage ◽

Open Loop ◽

Current Sensor ◽

Switching Frequency ◽

Led Driver ◽

Advantages And Disadvantages ◽

Led Drivers ◽

Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

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