Triangular wave excited Wheatstone bridge measuring circuit

A technology for measuring circuits and triangular waves, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of complex and expensive circuits for sinusoidal signal amplitude and frequency, and achieve improved measurement Accuracy, the effect of simplifying the subsequent measurement circuit

Inactive Publication Date: 2015-07-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In various Wheatstone bridge measurement methods, a high-precision sine wave constant current source is often required to excite the Wheatstone bridge, but the circuit for generating stable and accurate sinusoidal signal amplitude and frequency is complex and expensive, and the subsequent measurement circuit is also complicated and expensive

Method used

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  • Triangular wave excited Wheatstone bridge measuring circuit
  • Triangular wave excited Wheatstone bridge measuring circuit
  • Triangular wave excited Wheatstone bridge measuring circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see figure 1 , a Wheatstone bridge measurement circuit excited by a triangular wave, 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;

[0041] The microcontroller MCU controls the digital-to-analog converter DAC output such as figure 2 The shown positive and negative periodic symmetric triangular wave voltage signal, the triangular wave voltage signal is converted into a triangular wave current signal I by the voltage-current converter VCC i , triangular wave current signal I i Excite the Wheatstone bridge, the voltage output signal V of the Wheatstone bridge i After being amplified by the amplifier A, it is 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 cycl...

Embodiment 2

[0066] see image 3 , a Wheatstone bridge measurement circuit excited by a triangular wave, 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 differential triangular wave current signal I shown i , differential triangular wave current signal I i Excite the Wheatstone bridge, the voltage output signal V of the Wheatstone bridge i After being amplified by the amplifier A, it is 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 cycles of the triangular wave. That is proportional to the output of the Wheatstone bridge.

[0068] Wherein, the microc...

Embodiment 3

[0071] see Figure 5 , a Wheatstone bridge measurement circuit excited by a triangular wave, comprising: a microcontroller MCU, an integrator, a voltage-current converter VCC, an amplifier A, and an analog-to-digital converter ADC;

[0072] The first general-purpose port line GPIO of the microcontroller MCU 1 And the second general-purpose port line GPIO 2 output as Image 6 The shown two-way square-wave voltage signals are opposite to each other and the duty ratio is 50%. The two-way square-wave voltage signals pass through the integrator (by the first resistor R 1 , the second resistance R 2 and capacitance C 1 Composition, wherein, the integral circuit can convert the square wave signal into a triangular wave signal, and has the function of delay and phase shift) into two triangular wave voltage signals, and the two triangular wave voltage signals are combined into a differential triangular wave through the voltage-current converter VCC Current signal I i , triangular...

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PUM

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Abstract

The invention discloses a triangular wave excited Wheatstone bridge measuring circuit and relates to the field of Wheatstone bridge measurement. The Wheatstone bridge measuring circuit comprises a microprocessor; the microprocessor controls a digital analog converter to output triangular wave voltage signals with symmetrical positive and negative periods; the triangular wave voltage signals are converted to be triangular wave current signals through a voltage and current converter; the triangular wave current signals excite the Wheatstone bridge; voltage output signals of the Wheatstone bridge are input to the digital analog converter after being amplified through an amplifier; the digital analog converter input a conversion result to a microcontroller; the microcontroller results of accumulated sum and subtract of respective data of the positive periods and negative periods of the triangular waves are proportional to output of the Wheatstone bridge through the microcontroller. The Wheatstone bridge measuring circuit reduces complexity of a constant flow source circuit and a follow-up measuring circuit and improves the accuracy of Wheatstone bridge measurement.

Description

technical field [0001] The invention relates to the field of impedance measurement, in particular to a triangular wave excitation Wheatstone bridge measurement circuit. Background technique [0002] A Wheatstone bridge (also known as a single-arm bridge) is an instrument that can make precise measurements. Wheatstone bridges are often used in precision electronic measurements. In various Wheatstone bridge measurement methods, a high-precision sine wave constant current source is often required to excite the Wheatstone bridge, but the circuit for generating stable and accurate sinusoidal signal amplitude and frequency is complex and expensive, and the subsequent measurement circuit is also Complicated and expensive. Contents of the invention [0003] The present invention provides a Wheatstone bridge measurement circuit excited by a triangular wave. The present invention reduces the complexity of the constant current source circuit and the subsequent measurement circuit, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01R17/00
Inventor 林凌刘红艳李泽云杜文芳李刚
Owner TIANJIN UNIV
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