Improvement of the temperature and noise parameters of the digitally controlled current source for flux-gate magnetometers

Abstract. The paper discusses the possibility to improve temperature and noise characteristics of fluxgate variometers. The new fluxgate sensor with a Co-based amorphous ring core is described. This sensor is capable to improve the signal-noise ratio at the recording short-period geomagnetic variations. Besides the sensor performance, it is very important to create the high stability compensation field, which is canceling the main Earth magnetic field inside the magnetic cores. For this purpose the new digitally controlled current source with low noise level and high temperature stability is developed.

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System Design of Digitally Controlled Constant Current Source

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.313-314.387 ◽

2013 ◽

Vol 313-314 ◽

pp. 387-390

Author(s):

Ai Jun Zhu ◽

Yin Chao Shao

Keyword(s):

Current Source ◽

Constant Current ◽

Constant Current Source ◽

Digital To Analog Converter ◽

Current Output ◽

Error Ratio ◽

Digitally Controlled ◽

Output Module ◽

System Output ◽

Time Acquisition

In order to provide stable and adjustable current source for portable systems, this paper designs a digitally controlled constant current source. According to the input of independent key, the output of the microcontroller digital volume controls digital-to-analog converter by Voltage-Current conversion module to get the constant current output. The output module consists of the operational amplifier and the power transistor TIP122, which is used for voltage-current conversion. At the same time, the value of output current is obtained by sampling resistor to convert the real-time acquisition and monitor the output of constant current source. The experimental results show that the system output ranges from 0 mA to 240 mA. The value of constant current can be controlled by stepper key, and the measurement error ratio can meet the requirement of design.

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Digitally controlled 4-channel constant current source for LED luminary based on PIC microcontroler

2016 19th International Symposium on Electrical Apparatus and Technologies (SIELA) ◽

10.1109/siela.2016.7543016 ◽

2016 ◽

Cited By ~ 1

Author(s):

Rostislav Kandilarov

Keyword(s):

Current Source ◽

Constant Current ◽

Constant Current Source ◽

Digitally Controlled

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Digitally Controlled Gate Current Source-Based Active Gate Driver for Silicon Carbide MOSFETs

IEEE Transactions on Industrial Electronics ◽

10.1109/tie.2019.2958301 ◽

2020 ◽

Vol 67 (12) ◽

pp. 10121-10133

Author(s):

Yash Sukhatme ◽

Vamshi Krishna Miryala ◽

P. Ganesan ◽

Kamalesh Hatua

Keyword(s):

Silicon Carbide ◽

Current Source ◽

Gate Current ◽

Digitally Controlled ◽

Gate Driver

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Possibilities of further improvement of 1 s fluxgate variometers

Geoscientific Instrumentation Methods and Data Systems ◽

10.5194/gi-6-301-2017 ◽

2017 ◽

Vol 6 (2) ◽

pp. 301-309 ◽

Cited By ~ 9

Author(s):

Andriy Marusenkov

Keyword(s):

Signal To Noise Ratio ◽

Current Source ◽

Temperature Stability ◽

Low Noise ◽

High Temperature Stability ◽

Geomagnetic Variations ◽

Noise Characteristics ◽

Short Period ◽

Earth Magnetic Field ◽

Digitally Controlled

Abstract. The paper discusses the possibility of improving temperature and noise characteristics of fluxgate variometers. The new fluxgate sensor with a Co-based amorphous ring core is described. This sensor is capable of improving the signal-to-noise ratio at the recording short-period geomagnetic variations. Besides the sensor performance, it is very important to create the high-stability compensation field that cancels the main Earth magnetic field inside the magnetic cores. For this purpose the new digitally controlled current source with low noise level and high temperature stability is developed.

Download Full-text