Charging-type portable pA micro current monitoring system

A monitoring system and micro-current technology, applied in the direction of measuring only current, battery circuit devices, measuring current/voltage, etc., can solve the problems of large size, high wiring complexity, inconvenient use, etc. Save battery power, reduce thermal noise interference effect

Active Publication Date: 2016-08-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the inconvenience of using the existing pA monitor due to its large volume, heavy wei...

Method used

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  • Charging-type portable pA micro current monitoring system
  • Charging-type portable pA micro current monitoring system
  • Charging-type portable pA micro current monitoring system

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] figure 1 It is a structural principle diagram of the present invention, and the operational amplifier of the I / V conversion circuit used in the present invention is a precision operational amplifier with low bias current and low offset voltage. According to the calculation method of the amplifying circuit, the present invention designs the corresponding circuit schematic diagram, innovatively suspends the welding input end, and draws the printed circuit board. Considering the anti-interference problem of the input terminal, there is no input pad on the printed circuit board, but all the pins connected to the input terminal are soldered in the air to become an independent isolated input module insulated from the surrounding.

[0032] Figure 2.1-2.3 It is the circuit schematic diagram of the circuit board of the present invention. The ...

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Abstract

The invention relates to a charging-type portable pA micro current monitoring system. The system adopts a single lithium battery for a unit for storing and supplying electric energy, a low-power consumption and high-precision operational amplifier and a feedback circuit are adopted, with a pA-level micro current I/V conversion circuit as a core, through multiple anti-interference protection circuits, USB is selected for charging through a charging switch, system power supply is selected through a power supply selection switch, the system power supply comes from the USB in match with the lithium battery, and monitoring on the pA micro current is completed. The charging-type portable pA micro current monitoring system can be used as a portable measurement instrument and can be used indoors, outdoors and other places in need of monitoring, power supply by the lithium battery can be realized both indoors and outdoors, and power supply by the USB is also realized. The size of the monitor of the invention is only the size of a palm, the weight is light, carrying is facilitated, the monitoring precision is high, the price is low, the testing is convenient, and a corresponding conversion voltage value can be tested when to-be-monitored micro current is inserted according to requirements.

Description

technical field [0001] The invention relates to the field of microcurrent monitoring, in particular to a rechargeable portable microcurrent monitoring system. Background technique [0002] The world is composed of many substances, and electrons in the substances are one of the elementary particles, and the movement of electrons will generate electric current. Weak signals commonly exist in human life, such as weak light, weak sound, weak magnetic field, small capacitance, small displacement and micro pressure, etc. With the rapid development of science and technology, the measurement of weak current is inseparable from many fields. In the fields of semiconductor production, insulating materials, weak detection, etc., the generation and testing of micro current plays a very important role, and the measurement range of most weak currents is far below 10- 10 a. Therefore, the technique of measuring microcurrent has wide application prospects in various fields and is of great...

Claims

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Application Information

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IPC IPC(8): H02J7/00G01R19/00
CPCG01R19/0092H02J7/00
Inventor 耿淑琴刘晨何蕴良彭晓宏侯立刚汪金辉袁颖高祥凯
Owner BEIJING UNIV OF TECH
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