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Resistance measurement circuit of raising preset level triangular wave excitation

A preset level, resistance measurement technology, applied in the measurement of electrical variables, resistance/reactance/impedance, measurement devices and other directions, can solve the problems of low signal-to-noise ratio of digital signals, affecting the accuracy of signal acquisition, etc., to achieve large information measurement , easy debugging, high-precision measurement effect

Inactive Publication Date: 2017-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, when a pure triangular wave is used as the excitation signal, the signal-to-noise ratio of the digital signal obtained in the low-level part of the triangular wave is very low, thereby affecting the acquisition accuracy of the signal

Method used

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  • Resistance measurement circuit of raising preset level triangular wave excitation
  • Resistance measurement circuit of raising preset level triangular wave excitation
  • Resistance measurement circuit of raising preset level triangular wave excitation

Examples

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Embodiment 1

[0035] see figure 1 , a resistance measurement circuit for raising a preset level triangular wave excitation, comprising: a microcontroller MCU, a digital-to-analog converter DAC, a voltage-current converter VCC, an amplifier A, and an analog-to-digital converter ADC;

[0036] The microcontroller MCU controls the digital-to-analog converter DAC output such as figure 2 The shown positive and negative cycles symmetrically raise the preset level triangular wave voltage signal, and the raised preset level triangular wave voltage signal is converted into a raised preset current value triangular wave current signal I through the voltage-current converter VCC i , increase the preset current value triangular wave current signal I i Excite the measured resistance Z x , generating a voltage signal V i =I i Z x , the voltage signal is amplified by the amplifier A and then input to the analog-to-digital converter ADC, and the analog-to-digital converter ADC inputs the conversion res...

Embodiment 2

[0066] see image 3 , a resistance measurement circuit for raising a preset level triangular wave excitation, comprising: a microcontroller MCU, a current digital-to-analog converter IDAC, an amplifier A, and an analog-to-digital converter ADC;

[0067] The microcontroller MCU controls the current digital-to-analog converter IDAC output as Figure 4 The positive and negative periodic symmetric triangular wave current signal I shown i , triangular wave current signal I i Excite the measured resistance Z x , generating a voltage signal V i =I i Z x , the voltage signal is amplified by the amplifier A and then input to the analog-to-digital converter ADC, and the analog-to-digital converter ADC inputs the conversion result to the microcontroller MCU, and the microcontroller MCU accumulates and subtracts the respective data of the positive and negative half periods of the triangular wave The result obtained is proportional to the measured resistance Z x , the measured resis...

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Abstract

The invention discloses a resistance measurement circuit of raising preset level triangular wave excitation, and relates to the field of resistance measurement. The resistance measurement circuit comprises a microcontroller which controls a digital-to-analog converter to output raising preset level triangular wave voltage signals of which the positive and negative cycles are symmetric. The raising preset level triangular wave voltage signals are converted into raising preset current value triangular wave current signals through a voltage and current converter. The raising preset current value triangular wave current signals excite the measured resistor to generate voltage signals. The voltage signals are inputted to an analog-to-digital converter through amplification of an amplifier, and the analog-to-digital converter inputs the conversion result to the microcontroller. The microcontroller enables the result of accumulation and subtraction of the respective data of the positive and negative half cycles of the raising preset level triangular waves to be proportional to the measured resistor so as to calculate the resistance value of the measured resistor. The complexity of a constant current source circuit and a subsequent measurement circuit can be reduced and the accuracy of resistance measurement can be enhanced.

Description

technical field [0001] The invention relates to the field of resistance measurement, in particular to a resistance measurement circuit for raising a preset level triangular wave excitation. Background technique [0002] The measurement of resistance is very common. Among various resistance measurement methods, voltammetry is widely used because of its high precision. Voltammetry measures resistance by using Ohm's law: R=U / I. Apply a known excitation voltage (constant voltage source circuit) to the measured resistance, then measure the current in the measured resistance, or apply a known excitation current (constant current source circuit) to the measured resistance, and then measure the voltage in the measured resistance , the resistance value of the unknown resistor can be calculated. [0003] In order to improve the quality of signal acquisition, the patent application in the prior art with the announcement number of CN 104808063A and the announcement date of July 29, 20...

Claims

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Application Information

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IPC IPC(8): G01R27/14
CPCG01R27/14
Inventor 林凌李淑娟李刚
Owner TIANJIN UNIV
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