Detection and amplification device for micro current

Abstract

The invention discloses a detection and amplification device for micro current, comprising a sampling circuit, an MCU (Micro Control Unit) control circuit and an amplification circuit, wherein the MCU control circuit controls sampling voltage; the amplification circuit amplifies the sampling voltage output by the sampling circuit; a filtering amplitude limiting circuit is connected between the sampling circuit and the amplification circuit; the amplification circuit comprises a first amplification circuit and a second amplification circuit; the filtering amplitude limiting circuit comprises afirst filtering amplitude limiting circuit and a second filtering amplitude limiting circuit; the MCU control circuit controls the first path of sampling voltage output by the sampling circuit to be filtered by the first filtering amplitude limiting circuit, and the first path of sampling voltage is input into a first path of amplification circuit for amplifying; and the MCU control circuit controls the second path of sampling voltage output by the sampling circuit to be filtered by the second filtering amplitude limiting circuit, and then, the second path of sampling voltage is input to the second amplification circuit for amplifying. The detection and amplification device has the advantages of accurate sampling, adjustable amplification multiple, simple circuit, reasonable design, strong practicality, simplified use and operation and strong anti-interference performance, and is simple and easy to realize.

Description

technical field [0001] The invention relates to a micro-current detection and amplification device. technical background [0002] Micro-currents are becoming more and more frequent in daily detection processing, which requires detection and amplification of micro-currents. But ordinary amplifiers can no longer be used because their input offset voltages are above hundreds of microvolts. It is enough to drown the signal. Even if the offset The voltage can be adjusted to zero, but the drift is difficult to eliminate, so a special circuit is required for the detection and amplification of micro-current. SUMMARY OF THE INVENTION [0003] In order to overcome the above technical defects, the present invention provides a micro-current detection and amplification device with simple circuit, reasonable design, strong practicability, simplified operation and strong anti-interference. [0004] In order to achieve the above purpose, the specific technical solutions are: [0005] Th...

AI Technical Summary

Problems solved by technology

[0002] Micro-currents are becoming more and more frequent in daily detection and processing, which requires the detection and amplification of micro-currents. But ordinary amplifiers can no longer be used because their input offset voltage is above hundreds of microvolts. It is enough to drown the signal. Even if the offset The voltage can be adjusted to zero, but the drift is difficult to eliminate, so a special circuit is required for the detection and amplification of the micro current

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