CN105865496A - System and method for measuring resistive transducer through bridge circuit - Google Patents
System and method for measuring resistive transducer through bridge circuit Download PDFInfo
- Publication number
- CN105865496A CN105865496A CN201610335280.0A CN201610335280A CN105865496A CN 105865496 A CN105865496 A CN 105865496A CN 201610335280 A CN201610335280 A CN 201610335280A CN 105865496 A CN105865496 A CN 105865496A
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- Prior art keywords
- bridge circuit
- voltage
- resistance
- analog
- voltage source
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
Abstract
The invention discloses a system and a method for measuring a resistive transducer through a bridge circuit. The system comprises the bridge circuit, an analog-digital converter and a voltage source which is used for supplying power to the bridge circuit and a reference voltage interface of the analog-digital converter simultaneously, wherein the bridge circuit comprise precision resistors R1, R2 and R3 as well as a to-be-measured resistor R4. The method comprises the following steps: S1, the voltage source supplies power to the bridge circuit and the reference voltage interface of the analog-digital converter simultaneously; S2, the analog-digital converter samples the voltage difference delta U between two bridge arms of the bridge circuit and converts the voltage difference delta U into a digital signal delta AD; a full-scale digital signal AD0 corresponding to the voltage source U is equal to 2n; S3, a microprocessor calculates the value of the to-be-measured resistor R4 according to a formula shown in the specification. The bridge circuit and the reference voltage interface of the analog-digital converter adopt the same voltage source, the value of the to-be-measured resistor R4 is only related with the digital signal AD0 corresponding to the voltage source and the a digital signal delta AD corresponding to the voltage difference delta U, so that errors caused by fluctuation of system operating voltage is eliminated, and the detection precision is improved.
Description
Technical field
The present invention relates to technical field of sensor measurement, the system of resistance sensor measured by a kind of bridge circuit
And method.
Background technology
The resistance sensors such as thermistor (temperature) sensor, piezoresistive pickup and photosensitive resistance sensor are by measuring
Calculate the value of corresponding resistor, then by tabling look-up or the method for curve matching, inquire about or calculate corresponding temperature, pressure with
And the intensity etc. of light.Resistance sensor generally uses bridge circuit to sample analogue signal, with reference to Fig. 1, externally fed power supply
Becoming system work required voltage V by level conversion, on the one hand system operating voltage is used for powering to bridge circuit, on the other hand
It is converted into ADC reference voltage V through DC/DC transducerref, ADC reference voltage is used for supplying to analog-digital converter reference voltage interface
Electricity；Microprocessor control analog-digital converter is to the voltage difference sampling Δ U between two brachium pontis, and is converted into digital signal Δ AD.
In prior art, bridge circuit sees the voltage at Fig. 2, R4 and R3 two ends and is respectively U1 and U2, then between two brachium pontis
Voltage difference delta U=U1-U2, Obtain:
Set ADC figure place as n, then reference voltage VrefCorresponding full scale digital signal is AD0=2n, analog-to-digital conversion device is adopted
It is Δ AD that voltage difference delta U of sample is converted into digital signal, then obtain:
In conjunction with formula 1 and formula 2:
ADC reference voltage has smaller fluctuation, and the most accurately, but system operating voltage is by environment, power supply
The impact such as the manufacturing process of ripple and voltage chips itself often has larger fluctuation, and system operating voltage is in the range of certain
Fluctuation, rather than certain fixed value.Owing to the error of system operating voltage often leads to the value of the testing resistance R4 that computation and measurement goes out
Inaccuracy.
Summary of the invention
The present invention is directed to the problem that the testing resistance R4 degree of accuracy measured is low, and research design one bridge circuit is measured
The system and method for resistance sensor, the present invention uses same voltage source to bridge circuit and analog-digital converter reference voltage
The method that interface is powered eliminates the measurement error brought because of the instability of system operating voltage.
The technological means of the present invention is as follows:
The invention discloses a kind of bridge circuit and measure the system of resistance sensor, it is characterised in that including:
The bridge circuit being made up of precision resistance R1, R2, R3 and testing resistance R4；
Voltage difference between two brachium pontis of bridge circuit is sampled, is then converted into the analog-digital converter of digital signal；
And the voltage source simultaneously powered to bridge circuit and analog-digital converter reference voltage interface.
Further, described voltage source is system power supply voltage.
Further, described voltage source is the ADC reference voltage that system power supply voltage is converted into through DC/DC transducer.
Further, described resistance R1 one end connects the positive pole of voltage source, and the other end connects resistance R4；Described resistance R4's
The other end connects the negative pole of voltage source；One end of described resistance R2 connects the positive pole of voltage source, and the other end connects R3；Described resistance
The other end of R3 connects the negative pole of voltage source；Voltage difference between two brachium pontis is voltage and the resistance R3 two ends at resistance R4 two ends
Difference in voltage.
Further, described system also includes: control analog-digital converter to the voltage difference between two brachium pontis of bridge circuit
Sampling, and accept the microprocessor of the digital signal of sampling.
The invention also discloses a kind of method that resistance sensor measured by bridge circuit, it is characterised in that include following
Step:
S1, voltage source power to bridge circuit and analog-digital converter reference voltage interface simultaneously；
Voltage difference delta U between two brachium pontis of bridge circuit is sampled by S2, analog-digital converter, and is converted into digital signal Δ
AD；Described analog-digital bit is n, then corresponding for voltage source voltage U full scale digital signal is AD0=2n, then
S3, microprocessor are according to formulaCalculate testing resistance R4
Value.
Further, R1=R2=R3=R, then
Compared with the prior art, the system and method for bridge circuit of the present invention measurement resistance sensor has
Provide the benefit that: voltage and the voltage of analog-digital converter reference voltage interface employing that bridge circuit uses are same voltage
Source, the digital signal AD that the value of testing resistance R4 is the most corresponding with voltage source0The digital signal Δ AD corresponding with voltage difference delta U has
Close, eliminate the error brought because of the fluctuation of system operating voltage V, reduce cost, improve accuracy of detection.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the system schematic of prior art bridge-type resistance measurement resistance sensor；
Fig. 2 is prior art and embodiment Bridge 1 formula circuit；
Fig. 3 is the embodiment of the present invention 1 system schematic；
Fig. 4 is the embodiment of the present invention 2 system schematic；
Fig. 5 is embodiment of the present invention Bridge 2 formula circuit.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Embodiment 1
The system of bridge-type resistance measurement resistance sensor as shown in Figure 3, in conjunction with Fig. 2, externally fed power supply is by electricity
Flat turn changes system work required voltage V into, and on the one hand system operating voltage is used for powering to bridge circuit, on the other hand gives modulus
Converter voltage reference interface is powered；Microprocessor control analog-digital converter between two brachium pontis voltage difference sample Δ U, and
It is converted into digital signal Δ AD.
The voltage at R4 and R3 two ends is respectively U1 and U2, then voltage difference delta U=U1-U2 between two brachium pontis, Obtain:
It is AD that initialization system running voltage V changes into digital signal0, voltage difference delta U of analog-to-digital conversion device sampling is converted into
Digital signal is Δ AD, then obtain:
In conjunction with formula 4 and formula 5:
Then:
As a kind of preferred implementation of the present invention, choose R1=R2=R3=R, then can draw:
Concrete measuring method is:
S1, system operating voltage V power to bridge circuit and analog-digital converter reference voltage interface simultaneously；
Voltage difference delta U between two brachium pontis of bridge circuit is sampled by S2, analog-digital converter, and is converted into digital signal Δ
AD；Analog-digital bit is n, then corresponding for system operating voltage V full scale digital signal is AD0=2n, then
S3, microprocessor are according to formulaCalculate testing resistance R4
Value.
Optional R1=R2=R3=R, then microprocessor is according to formulaCalculate electricity to be measured
Resistance R4.
Embodiment 2
The system of bridge-type resistance measurement resistance sensor as shown in Figure 4, in conjunction with Fig. 5, externally fed power supply is by electricity
Flat turn changes system work required voltage V into, and system operating voltage is converted into ADC reference voltage V by DC/DC transducerref, ADC
Reference voltage VrefOn the one hand it is used for powering to bridge circuit, powers on the other hand to analog-digital converter reference voltage interface；Micro-place
Reason device control analog-digital converter is to the voltage difference sampling Δ U between two brachium pontis, and is converted into digital signal Δ AD.
The voltage at R4 and R3 two ends is respectively U1 and U2, then voltage difference delta U=U1-U2 between two brachium pontis, Obtain:
It is AD that initialization system running voltage V changes into digital signal0, voltage difference delta U of analog-to-digital conversion device sampling is converted into
Digital signal is Δ AD, then obtain:
In conjunction with formula 9 and formula 10:
Then:
As one preferred embodiment, choose R1=R2=R3=R, then:
Concrete measuring method is:
S1, ADC reference voltage VrefPower to bridge circuit and analog-digital converter reference voltage interface simultaneously；
Voltage difference delta U between two brachium pontis of bridge circuit is sampled by S2, analog-digital converter, and is converted into digital signal Δ
AD；Analog-digital bit is n, then ADC reference voltage VrefCorresponding full scale digital signal is AD0=2n, then
S3, microprocessor are according to formulaCalculate testing resistance R4
Value.
Optional R1=R2=R3=R, then microprocessor is according to formulaCalculate electricity to be measured
Resistance R4.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, according to technical scheme and
Inventive concept equivalent or change in addition, all should contain within protection scope of the present invention.
Claims (7)
1. the system of a bridge circuit measurement resistance sensor, it is characterised in that including:
The bridge circuit being made up of precision resistance R1, R2, R3 and testing resistance R4；
Voltage difference between two brachium pontis of bridge circuit is sampled, is then converted into the analog-digital converter of digital signal；
And the voltage source simultaneously powered to bridge circuit and analog-digital converter reference voltage interface.
The system of resistance sensor measured by bridge circuit the most according to claim 1, it is characterised in that described voltage source
For system power supply voltage.
The system of resistance sensor measured by bridge circuit the most according to claim 1, it is characterised in that described voltage source
The ADC reference voltage being converted into through DC/DC transducer for system power supply voltage.
The system of resistance sensor measured by bridge circuit the most according to claim 1, it is characterised in that described resistance R1
One end connects the positive pole of voltage source, and the other end connects resistance R4；The other end of described resistance R4 connects the negative pole of voltage source；Described
One end of resistance R2 connects the positive pole of voltage source, and the other end connects R3；The other end of described resistance R3 connects the negative pole of voltage source；
Voltage difference between two brachium pontis is the voltage difference in voltage with resistance R3 two ends at resistance R4 two ends.
5. measure the system of resistance sensor according to the bridge circuit described in any one of claim 1-4, it is characterised in that institute
System of stating also includes: controls analog-digital converter and samples the voltage difference between two brachium pontis of bridge circuit, and accepts the number of sampling
The microprocessor of word signal.
6. the method that resistance sensor measured by a bridge circuit, it is characterised in that comprise the following steps:
S1, voltage source U power to bridge circuit and analog-digital converter reference voltage interface simultaneously；
Voltage difference delta U between two brachium pontis of bridge circuit is sampled by S2, analog-digital converter, and is converted into digital signal
ΔAD；Described analog-digital bit is n, then corresponding for U full scale digital signal is AD0=2n, then
S3, microprocessor are according to formulaCalculate the value of testing resistance R4.
The method of resistance sensor measured by bridge circuit the most according to claim 6, it is characterised in that R1=R2=R3
=R, then
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610335280.0A CN105865496A (en) | 2016-05-19 | 2016-05-19 | System and method for measuring resistive transducer through bridge circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610335280.0A CN105865496A (en) | 2016-05-19 | 2016-05-19 | System and method for measuring resistive transducer through bridge circuit |
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| CN105865496A true CN105865496A (en) | 2016-08-17 |
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| CN201610335280.0A Pending CN105865496A (en) | 2016-05-19 | 2016-05-19 | System and method for measuring resistive transducer through bridge circuit |
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Cited By (3)
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| CN107180508A (en) * | 2017-05-22 | 2017-09-19 | 南京英安特科技实业有限公司 | A kind of system and method for alarm defence area multiplication |
| CN108226646A (en) * | 2018-01-17 | 2018-06-29 | 纳思达股份有限公司 | sensitive resistance measuring device and measuring method |
| CN110455870A (en) * | 2018-05-07 | 2019-11-15 | 中国石油化工股份有限公司 | Portable multi-channel gas sensing monitor and its application |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107180508A (en) * | 2017-05-22 | 2017-09-19 | 南京英安特科技实业有限公司 | A kind of system and method for alarm defence area multiplication |
| CN108226646A (en) * | 2018-01-17 | 2018-06-29 | 纳思达股份有限公司 | sensitive resistance measuring device and measuring method |
| CN113589045A (en) * | 2018-01-17 | 2021-11-02 | 珠海极海半导体有限公司 | Sensitive resistance measuring device and measuring method |
| CN110455870A (en) * | 2018-05-07 | 2019-11-15 | 中国石油化工股份有限公司 | Portable multi-channel gas sensing monitor and its application |
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Application publication date: 20160817 |