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A level conversion circuit for small signal change detection

A technology of change detection and conversion circuit, which is applied in the field of electricity to achieve the effect of small measurement error

Inactive Publication Date: 2016-09-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no such circuit that can amplify the variation, and obtain the polarity and specific value of the variation, and the magnification can be adjusted and the specific magnification value can be known

Method used

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  • A level conversion circuit for small signal change detection
  • A level conversion circuit for small signal change detection
  • A level conversion circuit for small signal change detection

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Embodiment Construction

[0013] figure 1 It is a schematic diagram of the principle of the level conversion circuit for small signal change detection of the present invention. As shown in the figure, the level conversion circuit for small signal change detection includes:

[0014] The first operational amplifier A1, the second operational amplifier A2, the third operational amplifier A3, the fourth operational amplifier A4, the fifth operational amplifier A5, the first switch S1, the second switch S2, the first resistor R1, the second resistor R2, The third resistor R3, the fourth resistor R4, the fifth resistor R5, the variable resistor R6, and the reference voltage generating device, wherein the non-inverting input terminal of the first operational amplifier receives the input signal Uin, and the inverting input terminal of the first operational amplifier terminal is connected to its output terminal, and the output terminal of the first operational amplifier is respectively connected to the inverti...

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Abstract

The invention relates to a level switching circuit for small-signal change detection. The level switching circuit for small-signal change detection comprises a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a fifth operational amplifier, a first switch, a second switch, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a variable resistor and a reference voltage generating device. According to the level switching circuit for small-signal change detection, the polarity of the output voltage of a measured sensor can be obtained, the variable voltage can be amplified, the number of amplification times can be adjusted and obtained, and therefore the output value of the sensor can be obtained through direct calculation according to a measurement value.

Description

technical field [0001] The present invention relates to the field of electricity, and more specifically, relates to a level conversion circuit for small signal change detection. Background technique [0002] In the process of actually using a sensor that outputs a DC signal, it is often encountered that the variation of the output voltage is small with the measured change. If the output voltage is directly amplified, a large voltage will be obtained, but in our actual use It is desirable to amplify only the portion where the voltage changes. [0003] At present, there is no such circuit that can amplify the change amount, obtain the polarity and specific value of the change amount, and can adjust the magnification and know the specific magnification value. Contents of the invention [0004] In order to solve the above technical problems, the present invention provides a level conversion circuit for small signal change detection, which includes: [0005] The first operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/34
Inventor 刘喆颉杨建新黄耀雄李晓光贺晓宏
Owner TAIYUAN UNIV OF TECH