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A capacitive humidity sensor interface circuit

A technology of humidity sensor and interface circuit, applied in the field of sensors, can solve the problem of no signal output, etc., to achieve the effect of detection

Active Publication Date: 2020-05-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional switched capacitor circuits have no signal output during the sampling phase

Method used

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  • A capacitive humidity sensor interface circuit
  • A capacitive humidity sensor interface circuit
  • A capacitive humidity sensor interface circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention proposes a capacitive humidity sensor interface circuit, which adopts the alternate sampling method of double operational amplifiers, so that the circuit can continuously output amplified signals, such as figure 1As shown, the following setting method is specially adopted: including detection branch, reference branch, two-stage amplification branch, the detection branch and the reference branch are connected together and respectively connected to the input side of the two-stage amplification branch, and the two-stage amplification The output side of the branch is connected together and forms the output of the interface circuit, and a capacitive feedback branch connected to the input side and the output side is also provided on the two-stage amplification branch; the circuit works in a time-sharing manner through clock control, using The capacitive feedback form and the charge accumulation effect convert the change of capacitance into the change of v...

Embodiment 2

[0030] This embodiment is further optimized on the basis of the above embodiments, such as figure 1 As shown, further in order to better realize the present invention, the following arrangement is adopted in particular: the detection branch includes a humidity-sensitive capacitor Cs and a clock logic circuit, and a reference capacitor Cr and a clock logic circuit are also arranged on the reference branch; One end of the humidity sensitive capacitor Cs and one end of the reference capacitor Cr are all connected to the clock logic circuit, and the other end of the humidity sensitive capacitor Cs is connected to the other end of the reference capacitor Cr and is connected to the input side of the two-stage amplifying branch; The humidity-sensitive capacitor Cs changes its capacitance value by detecting changes in external humidity. The reference capacitor Cr adopts the same structure as the humidity-sensitive capacitor Cs, but its capacitance value does not change with humidity. ...

Embodiment 3

[0032] This embodiment is further optimized on the basis of any of the above embodiments, such as figure 1 As shown, further in order to better realize the present invention, the following setting method is adopted in particular: the clock logic circuit includes logic switch S1, logic switch S2, logic switch S1B, logic switch S2B, and logic switch S1 and logic switch S2 Commonly connected, logic switch S1B and logic switch S2B are commonly connected, and the common connection terminal of logic switch S1 and logic switch S2 is connected to reference capacitor Cr, and the common connection terminal of logic switch S1B and logic switch S2B is connected to humidity sensitive capacitor Cs.

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Abstract

The invention discloses a capacitive humidity sensor interface circuit, which includes a detection branch, a reference branch, and a two-stage amplification branch. The detection branch and the reference branch are connected together and are respectively connected to the input side of the two-stage amplification branch. The output sides of the two-stage amplifying branches are connected together and form the output of the interface circuit, and a capacitive feedback branch connected to the input side and the output side is also provided on the two-stage amplifying branches; the circuit is based on the switched capacitor circuit principle, through The time-sharing operation of two operational amplifiers solves the shortcoming of no output in the sampling stage of the traditional switched capacitor circuit, and is suitable for most capacitive sensors, thereby better realizing the detection of tiny capacitors.

Description

technical field [0001] The invention relates to the fields of sensor technology and the like, and specifically relates to a capacitive humidity sensor interface circuit. Background technique [0002] As the tentacles of human beings to detect information in nature, sensors can convert various non-electrical information that people need to detect into measurable electrical information, and provide conditions and basis for people to recognize and control corresponding objects. With the continuous development of modern measurement, control and automation technology, sensor technology has been paid more and more attention by people, and communication technology and computer technology constitute the three pillars of modern information industry, which is an important foundation of information industry. , semiconductor technology, computer technology, information processing technology, microelectronics, optics, acoustics, precision machinery, bionics and materials science and many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/22
CPCG01N27/223G01N27/228
Inventor 周云李小飞刘宇星卢云龙吕坚阙隆成田雷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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