Micro-current signal extraction system

A signal extraction and micro-current technology, applied in the field of signal processing, can solve the problem that the accuracy of the weak current acquisition system lags behind foreign countries, and achieve the effects of saving I/O interfaces, reliable data transmission, and suppressing power frequency interference.

Inactive Publication Date: 2014-09-03
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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Problems solved by technology

[0004] The present invention is aimed at the problem that the accuracy of the weak current acquisition system lags behind

Method used

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  • Micro-current signal extraction system

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Embodiment Construction

[0016] The system analyzes the measured signal components, and the micro-current signal extraction module uses high-precision resistance sampling signals to convert current signals into voltage signals for easy extraction. Perform primary amplification, analog filtering and secondary amplification on the converted signal to complete the analog signal pre-conditioning. Considering that the signal contains many noise signals, a 5th-order Butterworth low-pass filter is used to filter out all signals higher than 3HZ. This system chooses MAX7410 chip to realize its function very well. After the filtered signal is amplified twice, the output is A / D converted, and the analog signal is converted into a digital signal, which is convenient for subsequent data processing. This system uses the MAX132 chip, which can realize 18-bit high-precision A / D conversion. Suppress 50HZ power frequency interference, and then go through range processing and MCU digital signal processing, mainly digita...

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Abstract

The invention relates to a micro-current signal extraction system. A signal is sampled by adopting a high-precision resistor, a current signal is transformed into a voltage signal; the voltage signal is transmitted to an analog signal preconditioning circuit, and sequentially passes through a primary amplification circuit, an analog filter circuit and a secondary amplification circuit to complete analog signal preconditioning; the signal which is subjected to analog signal preconditioning is output to a digital signal preconditioning circuit, and sequentially passes through an A/D (analog to digital) conversion circuit and a range switching and digital filter circuit; and a required micro-current signal is output after the digital signal conditioning is completed. According to the micro-current signal extraction system, the analog signal and digital signal conditionings are combined, a chopper-stabilizer integrated operational amplifier with high gain, high input impedance and high common mode rejection ratio is selected for preposed amplification of the system, 50Hz power line interference is inhibited by a dual-integral AD analog-to-digital conversion chip, and the I/O (input/output) interfaces can be greatly saved by virtue of 4-line serial communication, and high-efficiency and reliable data transmission can be realized. The micro-current signal extraction system can realize accurate measurement on micro-current, and can be used for insulation monitoring of electrical equipment.

Description

technical field [0001] The invention relates to a signal processing technology, in particular to a microcurrent signal extraction system. Background technique [0002] Micro-current signal extraction has a wide demand in the online monitoring of electrical equipment in power systems. However, in the power system, the operating environment of electrical equipment is complex, and there are various noise interferences, mainly including power line noise, electrical equipment noise, radio frequency noise, and mechanical origin noise. Power line noise is mainly caused by power frequency electromagnetic fields, peak pulses caused by high-power switch on and off, and grid voltage fluctuations; electrical equipment noise mainly includes power frequency electromagnetic fields generated by equipment, corona discharge spark discharge, arc discharge, etc. Noise interference; radio frequency noise is mainly interference caused by communication tools such as TV, radar, and wireless commun...

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Application Information

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IPC IPC(8): G01R19/25
Inventor 陈炯高亮陈建杰郝永晶
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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