scholarly journals Development of a Current Sensor with Broad Current Measurement Range Using High- and Low-Range Parts

2019 ◽  
Author(s):  
JungWon shin ◽  
Shinwon Kang ◽  
SaeWan Kim
Keyword(s):  
Magnetic Force ◽  
Measurement Range ◽  
Current Measurement ◽  
Field Analysis ◽  
Current Sensor ◽  
High Current ◽  
Type Device ◽  
Shaped Part ◽  
Sensor Modeling ◽  
A Current

The measurement range of a conventional current sensor is narrow because it is used with signals relative to the rated values of the measurement range from a voltage-type device. Consequently, multiple current sensors must be used in accordance with the measurement range. To address this problem, this paper proposes a new current sensor with a clamp-shaped part for low current measurement and a simple straight structure for high current measurement. The output signals of the proposed current sensor are amplified with a Hall element using the magnetic force of a rectangular air gap inside the clamp. To verify the characteristics of the proposed current sensor, a current was applied to an external load, and the value determined by the current sensor noted. Then, electromagnetic field analysis was performed through current sensor modeling and the results obtained compared to the actual sensor results. The proposed sensor had a 1% linearity in the output signals and exhibited dynamic characteristics over a wide current range.

scholarly journals Designing and analyzing two non-invasive current sensors using Ampere Force Law (AFL)

2019 ◽  
Author(s):  
Mohammad Reza Zamani Kouhpanji
Keyword(s):  
Power Consumption ◽  
Magnetic Force ◽  
Permanent Magnets ◽  
Current Sensor ◽  
Single Wire ◽  
Non Invasive ◽  
Ampere Force ◽  
The Wire ◽  
Current Sensors ◽  
A Current

Here two different non-invasive current sensors are proposed, modeled and analyzed. The current sensors are based on the Ampere Force Law (AFL), defining the magnetic force between two parallel wire carrying currents. These current sensors can be used for detecting/sensing DC and AC currents as well as their combination in a single wire or multiple wires, and they do not rely on any permanent magnets for operation. In the first configuration, there are two microbeams, in which one of them is at the vicinity of the wire and undergoes the mechanical vibrations due to the magnetic force between the wire and the microbeam. The movement of the microbeam while it is generating a magnetic field induces a current inside another microbeam, which is stationary, as the output signal of the current sensor. In the second configuration, a single composite piezoelectric microbeam is used. The magnetic force between the wire and the piezoelectric microbeam leads the piezoelectric microbeam to move, thus it produces a voltage. Both configurations present extremely low power consumption, which is not dependent on the sensitivity of the current sensors. The dynamic response, sensitivity and power consumption of the current sensors are investigated, compared and discussed.

scholarly journals Nonintrusive Installation of the TMR Busbar DC Current Sensor

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
X. P. Xu ◽  
T. Z. Liu ◽  
M. Zhu ◽  
J. G. Wang
Keyword(s):  
Supply Voltage ◽  
Development Trend ◽  
Measurement Range ◽  
Current Measurement ◽  
Base Stations ◽  
Current Sensor ◽  
Electronic Systems ◽  
Power Electronic ◽  
Power Stations ◽  
Dc Current

In recent years, new energy vehicles, photovoltaic power stations, communication base stations, energy storage systems, and other power electronic systems have developed rapidly. The development of these systems has the trend of continuously increasing the power density per unit area, reducing the system volume, and continuously increasing using the busbars. More and more new current sensors will be used in these systems and play a key role. Traditional current sensor cannot meet the development trend of power electronic systems due to their large size and high cost. In this paper, a new small coreless tunnel junction magnetoresistance (TMR) busbar dc current sensor adopted differential scheme which improves the sensor’s anti-interference ability that is designed. The current sensor adopts an open-closed structure for easy nonintrusive installation. Four TMRs which adopted differential structure are placed on the edges of the busbar. The peak current measurement range is ±600 A, the rated current measurement range is ±300 A, and the supply voltage is 5 V.

Intelligent High Current Sensor for Various Frequency

2020 ◽  
Author(s):  
Bohumil Skala ◽  
Vladimir Kindl ◽  
Pavel Turjanica ◽  
Ales Vobornik ◽  
Libor Polacek ◽  
...  
Keyword(s):  
Current Sensor ◽  
High Current

Study of MFM Application in Semiconductor Failure Analysis

2004 ◽  
Author(s):  
Way-Jam Chen ◽  
Lily Shiau ◽  
Ming-Ching Huang ◽  
Chia-Hsing Chao
Keyword(s):  
Magnetic Field ◽  
Failure Analysis ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Current Flow ◽  
Force Microscopy ◽  
The Magnetic Field ◽  
A Current

Abstract In this study we have investigated the magnetic field associated with a current flowing in a circuit using Magnetic Force Microscopy (MFM). The technique is able to identify the magnetic field associated with a current flow and has potential for failure analysis.

High Current 270 VDC Contactor and Current Sensor System Design and Development

1998 ◽  
Author(s):  
Sean Sande ◽  
Karl Kitts ◽  
Robert Shanebrook ◽  
Dennis Timm ◽  
Tuan N. Tran
Keyword(s):  
System Design ◽  
Sensor System ◽  
Current Sensor ◽  
High Current ◽  
Design And Development ◽  
Sensor System Design

A Current Sensor Based on Capillary Microresonator Filled With Terfenol-D Nanoparticles

2021 ◽  
Vol 33 (5) ◽  
pp. 239-242
Author(s):  
Chang-Qiu Yu ◽  
Rui Niu ◽  
Zhong-Di Peng ◽  
Hai Li ◽  
Yong-Ming Luo ◽  
...  
Keyword(s):  
Current Sensor ◽  
A Current

scholarly journals Measuring Current in a Power Converter Using Fuzzy Automatic Gain Control

2021 ◽  
Vol 11 (13) ◽  
pp. 5793
Author(s):  
Bartosz Dominikowski
Keyword(s):  
High Resolution ◽  
Fuzzy Controller ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Measurement Range ◽  
Power Converter ◽  
Current Measurement ◽  
Dc Power ◽  
Programmable Gain ◽  
Electric Loads

The accuracy of current measurements can be increased by appropriate amplification of the signal to within the measurement range. Accurate current measurement is important for energy monitoring and in power converter control systems. Resistance and inductive current transducers are used to measure the major current in AC/DC power converters. The output value of the current transducer depends on the load motor, and changes across the whole measurement range. Modern current measurement circuits are equipped with operational amplifiers with constant or programmable gain. These circuits are not able to measure small input currents with high resolution. This article proposes a precise loop gain system that can be implemented with various algorithms. Computer analysis of various automatic gain control (AGC) systems proved the effectiveness of the Mamdani controller, which was implemented in an MCU (microprocessor). The proposed fuzzy controller continuously determines the value of the conversion factor. The system also enables high resolution measurements of the current emitted from small electric loads (≥1 A) when the electric motor is stationary.

scholarly journals Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1561
Author(s):  
Hao Chen ◽  
Zhongnan Qian ◽  
Chengyin Liu ◽  
Jiande Wu ◽  
Wuhua Li ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Current Measurement ◽  
Current Sensor ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Current Sensing ◽  
Self Powered

Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.

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