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Weak current detection device

A detection device and weak current technology, which is applied in the direction of measuring devices, parts of electrical measuring instruments, measuring electricity, etc., can solve the problems that weak current detection devices cannot achieve high speed, high accuracy, high sensitivity and wide range, etc. Achieve high sensitivity and stable detection effect

Pending Publication Date: 2022-06-28
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the traditional weak current detection device cannot achieve high speed, high precision, high sensitivity and wide range, and now provides a weak current detection device

Method used

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specific Embodiment approach 1

[0032] Specific implementation mode 1: refer to figure 1 and figure 2 Specifically describing this embodiment, a weak current detection device described in this embodiment includes: a transimpedance amplifier circuit 1 , a conditioning circuit 2 , an analog-to-digital conversion circuit 3 , a processor 4 , an inner shielding structure and an outer shielding structure.

[0033] The transimpedance amplifying circuit 1 and the conditioning circuit 2 are all located in the inner shielding structure, and the inner shielding structure, the analog-to-digital conversion circuit 3 and the processor 4 are all located in the outer shielding structure.

[0034] The amplified signal output end of the transimpedance amplifier circuit 1 is connected to the signal input end of the conditioning circuit 2, the conditioning signal output end of the conditioning circuit 2 is connected to the signal input end of the analog-to-digital conversion circuit 3, and the digital signal output end of the ...

specific Embodiment approach 2

[0039] Specific implementation two: refer to image 3 and Figure 4 This embodiment is specifically described. This embodiment is a further description of the weak current detection device described in Embodiment 1. In this embodiment, the composite operational amplifier circuit includes: a field effect transistor Q100, a field effect transistor Q101A, a field effect transistor Q101A, a field effect transistor Q101A, a field effect transistor Effect tube Q101B, resistors R100~R108, resistor R113, polar capacitor CP100, capacitors C100~C103, diode CR100, diode CR101, amplifier U100 and constant current source circuit.

[0040] The gate of the field effect transistor Q101A is used as the inverting input terminal of the composite operational amplifier circuit. The source of the field effect transistor Q101A is connected to one end of the resistor R108 and the gate of the field effect transistor Q100 respectively. The source of the transistor Q100 and the drain of the FET Q100 ar...

specific Embodiment approach 3

[0045] Specific implementation mode three: refer to Figure 5 to Figure 8 This embodiment is described in detail. This embodiment is a further description of the weak current detection device described in Embodiment 1 or 2. In this embodiment, the transimpedance selection circuit includes a monostable double-contact relay and an NPN type relay. Transistor D1.

[0046] The 2-pin and 5-pin of the monostable double-contact relay are connected with one end of the gain resistor R2, and the 4-pin and 7-pin of the monostable double-contact relay are connected with one end of the gain resistor R1. The 6-pin of the contact relay is used as the micro-current input terminal of the transimpedance selection circuit, the 8-pin of the monostable double-contact relay is connected to the collector of the triode D1, and the base of the triode D1 is used as the range switching signal of the transimpedance selection circuit At the input end, the emitter of the triode D1 is connected to the power...

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Abstract

A weak current detection device relates to the technical field of weak signal processing. The invention aims to solve the problem that the traditional micro-current signal detection device cannot simultaneously realize high accuracy, high sensitivity and wide range. The transimpedance amplification circuit is connected with the conditioning circuit, the conditioning circuit is connected with the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected with the processor, the processor controls the transimpedance amplification circuit to switch ranges, the transimpedance amplification circuit collects micro current, and the processor outputs a current value; the transimpedance amplification circuit comprises a transimpedance selection circuit and a composite operational amplifier circuit, the transimpedance selection circuit switches ranges, and two range output ends of the transimpedance selection circuit are connected with an output end of the composite operational amplifier circuit and serve as an amplification signal output end of the transimpedance amplification circuit; the micro-current input end of the transimpedance selection circuit and the inverted input end of the composite operational amplifier circuit are connected and jointly serve as the micro-current input end of the transimpedance amplification circuit, and the two measuring range output ends of the transimpedance selection circuit are respectively connected with gain resistors with different resistance values in series.

Description

technical field [0001] The invention belongs to the technical field of weak signal processing. Background technique [0002] With the continuous development of science and technology, electronic products have been popularized in all aspects of people's lives. In the process of large-scale use of integrated circuits, many circuit modules involve the amplification and detection of weak current signals. [0003] Because the weak current signal itself is very weak, and there is always the interference of noise and leakage current in the detection circuit, how to amplify and accurately detect the weak current signal has become a topic that has attracted much attention. At present, a large number of fields put forward higher and higher requirements for the sensitivity, accuracy, sampling frequency and detection range of weak current signal amplification and detection. However, the traditional weak current detection device has the problem that high speed, high accuracy, high sens...

Claims

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Application Information

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IPC IPC(8): G01R19/25G01R1/30
CPCG01R19/25G01R1/30
Inventor 盖建新王亚立
Owner HARBIN UNIV OF SCI & TECH
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