CN108226646A - sensitive resistance measuring device and measuring method - Google Patents
sensitive resistance measuring device and measuring method Download PDFInfo
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- CN108226646A CN108226646A CN201810046191.3A CN201810046191A CN108226646A CN 108226646 A CN108226646 A CN 108226646A CN 201810046191 A CN201810046191 A CN 201810046191A CN 108226646 A CN108226646 A CN 108226646A
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- resistance
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- sensitive resistance
- sensitive
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- 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 present invention provides a kind of sensitive resistance measuring device and measuring method, including MCU circuits, measuring circuit；MCU circuits include：For acquiring the ADC units of measuring circuit voltage value, for the power supply I/O interface powered for measuring circuit；Wherein, ADC units include：First voltage acquisition channel circuit, second voltage acquisition channel circuit；Measuring circuit includes：The sensitive resistance branch and measuring resistance branch being connected in parallel；Wherein, sensitive resistance branch includes the sensitive resistance RT being connected in series with and measuring resistance R；Preferred circuit branch includes two measuring resistance R being connected in series with；First voltage acquisition channel circuit is used to acquire the voltage value being connected in series between the sensitive resistance RT being connected in series with and measuring resistance R a little；Voltage value a little is connected in series between two measuring resistance R that second voltage acquisition channel circuit is connected in series with for acquisition.The sensitive resistance measuring device can effectively improve the accuracy of sensitive resistance resistance value measurement.
Description
Technical field
The present invention relates to measuring technique more particularly to a kind of sensitive resistance measuring devices and measuring method.
Background technology
Sensitive resistance is a kind of special resistance to the analog quantitys such as intensity of illumination, pressure, humidity and temperature sensitivity.For example,
Thermistor is the element that a kind of resistance value changes with temperature, and is divided into posive temperature coefficient thermistor and negative temperature coefficient heat-sensitive
Resistance；Humistor is the element that a kind of resistance value changes with humidity, and humidity is converted into electric signal；In addition to it is above-mentioned to temperature/
The resistance of humidity sensitive, also numerous other types of sensitive resistance.
In the prior art, sensitive resistance is measured generally using analog-digital converter (Analog to Digital
Converter, referred to as " ADC ") directly electric resistance partial pressure scheme, as shown in Figure 1, sensitive resistance measuring device 10 include microcontroller
Unit 101 (Microcontroller Unit, referred to as " MCU ") and measuring circuit 102.MCU101 includes 1011 He of ADC units
Power supply I/O interface 1012, wherein, ADC units 1011 are used to acquire the electric signal of sensitive resistance RT, and convert electrical signals to number
Word signal carries out Computer display；Power supply I/O interface 1012 is for being that provide voltage be V to measuring circuit 102ioPower supply power supply.It surveys
Amount circuit 102 is made of two resistance, and wherein sensitive resistance RT one end is grounded, and one end is connect with measuring resistance R.Measuring resistance R
One end is connect with sensitive resistance RT, and other end connection power supply I/O interface 1012, is measuring circuit 102 by power supply I/O interface 1012
Power supply.As shown in Figure 1, the voltage Vx, measuring resistance R connection power supplys IO of sensitive resistance RT one end are acquired using ADC units 1011
Another terminal voltage of interface 1012 is Vio, according to Ohm's law：
(Vio-Vx)/RR=Vx/RRT (1)
It is obtained according to formula (1)：
RRT=Vx╳RR/(Vio-Vx) (2)
According to formula (2) it is found that the error impact factor for influencing sensitive resistance RT resistance values includes：Vx, R and Vio, wherein, it is right
In VioFor：The voltage V that power supply I/O interface 1012 exportsioOther than measuring circuit 102 is given to power, sensitive resistance survey is returned
Other circuit modules power supply in device 10 is measured, each circuit module working condition of different time is different, i.e. VioLoad be dynamic
Variation, in addition being interfered etc. by surrounding influences, VioValue can generate larger fluctuation, generate error；In addition, for Vx：
Due to the reference voltage V of ADC units 1011bThere may be error, the absolute voltage value V that ADC units 1011 is caused to measurex
There may be errors；For R：Measuring resistance R is influenced by production technology and material, it is also possible to be existed certain
Error.Therefore there are larger errors for the resistance value of sensitive resistance RT obtained by above method measurement.
It is related with temperature/humidity parameter to be measured if sensitive resistance is temperature/humidity sensitive resistance；If sensitive electrical
Hinder measured value there are error, then can influence the accuracy of temperature/humidity parameter of acquisition, therefore, there is an urgent need for it is a kind of can accurately measure it is quick
The sensitive resistance measuring device and measuring method of the resistance value of sensing resistor, to ensure the accuracy of temperature/humidity parameter acquisition.
Invention content
The present invention provides a kind of sensitive resistance measuring device and measuring method, to solve the resistance of sensitive resistance in the prior art
Value measures the technical issues of inaccurate, error is larger.
One aspect of the invention provides a kind of sensitive resistance measuring device, including：
MCU circuits, measuring circuit；
The MCU circuits include：For acquiring the ADC units of the measuring circuit voltage value, for measuring electricity to be described
The power supply I/O interface of road power supply；Wherein, the ADC units include：First voltage acquisition channel circuit, second voltage acquisition channel
Circuit；The first voltage acquisition channel circuit is identical with the reference voltage of the second voltage acquisition channel circuit；
The measuring circuit includes：The sensitive resistance branch and measuring resistance branch being connected in parallel；Wherein, the sensitive electrical
Resistance branch includes the sensitive resistance RT being connected in series with and measuring resistance R；The preferred circuit branch includes two be connected in series with
Measuring resistance R；
The first voltage acquisition channel circuit is used to acquire the sensitive resistance RT being connected in series with and the mark
Voltage value a little is connected in series between quasi- resistance R；
The second voltage acquisition channel circuit is gone here and there between being used to acquiring two measuring resistance R being connected in series with
Join the voltage value of tie point.
Optionally, it further includes：Power supply branch；
The power supply branch is accessed in circuit of the power supply I/O interface for measuring circuit power supply；
The power supply branch includes：Selecting switch, capacitance；
The selecting switch includes two switch contacts；First switch contact is used to connect the capacitance and the power supply IO
The circuit of interface, so that the power supply I/O interface is the capacitor charging；Second switch contact is used to connect the capacitance and institute
The circuit of measuring circuit is stated, so that the capacitance is powered for the measuring circuit.
Optionally, one end of the measuring resistance R in the sensitive resistance branch is connect with the power supply I/O interface, the other end
It is connect respectively with the sensitive resistance RT and the first voltage acquisition channel circuit；
Alternatively,
One end of sensitive resistance RT in the sensitive resistance branch is connect with the power supply I/O interface, the other end with it is described
Measuring resistance R and the first voltage acquisition channel circuit connect respectively.
Optionally, one end of the measuring resistance R in the sensitive resistance branch and the second switch contact portion, it is another
End is connect respectively with the sensitive resistance RT and the first voltage acquisition channel circuit；
Alternatively,
One end of sensitive resistance RT in the sensitive resistance branch and the second switch contact portion, the other end and institute
It states measuring resistance R and the first voltage acquisition channel circuit connects respectively.
Optionally, the measuring resistance R is fixed value resistance.
Another aspect of the invention provides a kind of sensitive resistance measuring method, and the method is surveyed using aforementioned sensitive resistance
Device is measured to implement to measure, including：
Receive sensitive resistance measurement instruction；
According to the sensitive resistance measurement instruction, the first voltage acquisition channel circuit measuring obtains is obtained respectively
The second voltage value that one voltage value and the second voltage acquisition channel circuit measuring obtain；
According to the resistance value, the first voltage value, the second voltage value of the measuring resistance R, the sensitive electrical is determined
Hinder the resistance value of RT.
Optionally, it is another if one end of the measuring resistance R in the sensitive resistance branch is connect with the power supply I/O interface
End is connect respectively with the sensitive resistance RT and the first voltage acquisition channel circuit, wherein, described sensitive resistance RT one end
Ground connection；Then the first voltage value is the voltage value at the sensitive resistance RT both ends；It is correspondingly, described according to the measuring resistance
The resistance value of R, the first voltage value, the second voltage value determine the resistance value of the sensitive resistance RT, including：
According to RRT=Vx ╳ RR/ (2Vref-Vx) determines the resistance value of the sensitive resistance RT；
Wherein, the RRTRepresent the resistance value of the sensitive resistance RT, the Vx represents the first voltage value, the RRTable
Show the resistance value of the measuring resistance R, the Vref represents the second voltage value.
Optionally, if one end of the sensitive resistance RT in the sensitive resistance branch is connect with the power supply I/O interface, separately
One end is connect respectively with the measuring resistance R and the first voltage acquisition channel circuit, wherein, described measuring resistance R one end
Ground connection；Then the first voltage value is the voltage value at the measuring resistance R both ends；It is correspondingly, described according to the measuring resistance R
Resistance value, the first voltage value, the second voltage value, determine the resistance value of the sensitive resistance RT, including：
According to RRT=(2Vref-Vx) ╳ RR/ Vx determines the resistance value of the sensitive resistance RT；
Wherein, the RRTRepresent the resistance value of the sensitive resistance RT, the Vx represents the first voltage value, the RRTable
Show the resistance value of the measuring resistance R, the Vref represents the second voltage value.
Another aspect of the invention provides a kind of sensitive resistance measuring method, and the method is surveyed using aforementioned sensitive resistance
Device is measured to implement to measure, including：
Receive sensitive resistance measurement instruction；
According to the sensitive resistance measurement instruction, the instruction of first switch contact change-over is sent to the selecting switch；It is described
First switch contact change-over instructs that the selecting switch is made to touch to the second switch from the first switch contact change-over
Point, so that the power supply I/O interface stops to the capacitor charging, the capacitance is powered to the measuring circuit；
The first voltage value that the first voltage acquisition channel circuit measuring obtains is obtained respectively and the second voltage is adopted
The second voltage value that collection channel circuit measurement obtains；
According to the resistance value, the first voltage value, the second voltage value of the measuring resistance R, the sensitive electrical is determined
Hinder the resistance value of RT.
Optionally, it after the resistance value for determining the sensitive resistance RT, further includes：
The instruction of second switch contact change-over is sent to the selecting switch；The second switch contact change-over instructs to make
The selecting switch is from the second switch contact change-over to the first switch contact, so that the capacitance measures electricity with described
Circuit between road disconnects, and the capacitance stops powering to the measuring circuit, between the capacitance and the power supply I/O interface
Circuit communication, the power supply I/O interface is to the capacitor charging.
As shown from the above technical solution, sensitive resistance measuring device and measuring method provided by the invention, including MCU electricity
Road, measuring circuit；MCU circuits include：For acquiring the ADC units of measuring circuit voltage value, for what is powered for measuring circuit
Power supply I/O interface；Wherein, ADC units include：First voltage acquisition channel circuit, second voltage acquisition channel circuit；Measure electricity
Road includes：The sensitive resistance branch and measuring resistance branch being connected in parallel；Wherein, sensitive resistance branch includes being connected in series with quick
Sensing resistor RT and measuring resistance R；Preferred circuit branch includes two measuring resistance R being connected in series with；First voltage acquisition channel
Circuit is used to acquire the voltage value being connected in series between the sensitive resistance RT being connected in series with and measuring resistance R a little；Second voltage is adopted
Voltage value a little is connected in series between two measuring resistance R that collection channel circuit is connected in series with for acquisition.The sensitive resistance is surveyed
Amount device is connected in parallel by acquisition and the electricity of two branches of the sensitive resistance branch of resistance symmetric configuration and measuring resistance branch
Pressure realizes that equal proportion variation is presented in the voltage measurement error of two branches, so as to eliminate voltage measurement error to sensitive resistance
The influence of resistance value, the then accuracy for the sensitive resistance resistance value tested by sensitive resistance measuring device provided by the invention are higher.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure diagram of the sensitive resistance measuring device of the prior art；
Fig. 2 is the structure diagram of the sensitive resistance measuring device shown in an exemplary embodiment of the invention；
Fig. 3 is the structure diagram of the sensitive resistance measuring device shown in another exemplary embodiment of the present invention；
Fig. 4 is the structure diagram of the sensitive resistance measuring device shown in another exemplary embodiment of the present invention；
Fig. 5 is the structure diagram of the sensitive resistance measuring device shown in another exemplary embodiment of the present invention；
Fig. 6 is the sensitive resistance measuring method shown in an exemplary embodiment of the invention；
Fig. 7 is the sensitive resistance measuring method shown in another exemplary embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
Fig. 2 is the structure diagram of the sensitive resistance measuring device shown in an exemplary embodiment of the invention, such as Fig. 2 institutes
Show, the present embodiment provides a kind of sensitive resistance measuring device 20, including：MCU circuits 201, measuring circuit 202；MCU circuits 201
Including：For acquiring the ADC units 2011 of measuring circuit voltage value, for the power supply I/O interface powered for measuring circuit 202
2012；Wherein, ADC units 2011 include：First voltage acquisition channel circuit 2011a, second voltage acquisition channel circuit
2011b；The reference voltage V of first voltage acquisition channel circuit 2011a and second voltage acquisition channel circuit 2011bbIt is identical；It surveys
Amount circuit 202 includes：The sensitive resistance branch 2021 and measuring resistance branch 2022 being connected in parallel；Wherein, sensitive resistance branch
2021 include the sensitive resistance RT being connected in series with and measuring resistance R；Preferred circuit branch 2022 includes two be connected in series with marks
Quasi- resistance R；First voltage acquisition channel circuit 2011a is used to acquire between the sensitive resistance RT being connected in series with and measuring resistance R
It is connected in series with voltage value a little；Second voltage acquisition channel circuit 2011b for acquire two measuring resistance R being connected in series with it
Between be connected in series with voltage value a little.
Specifically, that includes for acquiring the ADC units 2011 of 202 voltage value of measuring circuit and be used for for MCU circuits 201
The power supply I/O interface 2012 powered for measuring circuit 202.ADC units 2011 include the circuit there are two collection voltages, i.e., and the
One voltage acquisition channel circuit 2011a and second voltage acquisition channel circuit 2011b, can collect measuring circuit 202 respectively
Two points voltage value, to ADC units 2011 two collection voltages circuit power reference voltage be Vb.Power supply IO connects
Mouth 2012 connects measuring circuits 202, and output supply voltage VioIt powers for measuring circuit 202.
Measuring circuit 202, including the sensitive resistance branch 2021 being connected in parallel and measuring resistance branch 2022.Wherein, it is quick
Sensing resistor branch 2021 is composed in series by measuring resistance R and sensitive resistance RT.The layout relationship of measuring resistance R and sensitive resistance RT
It can be with as shown in Fig. 2, measuring resistance R one end connection power supply I/O interface 2012, other end connection sensitive resistance RT.Sensitive resistance one
End ground connection, other end connection measuring resistance R.It is of course also possible to the two exchanges position (as shown in Figure 4), as long as ensureing that the two is
The relationship of series connection.Measuring resistance branch 2022 is composed in series by two measuring resistance R, the measuring resistance R mono- of two series connection
End is connected with each other, the other end ground connection of a measuring resistance R, the other end connection power supply I/O interface of another measuring resistance R
2012。
Sensitive resistance measuring device 20 provides supply voltage V by power supply I/O interface 2012 for measuring circuit 202io, pass through
Between sensitive resistance RT and measuring resistance R that the first voltage acquisition channel circuit 2011a acquisitions of ADC units 2011 are connected in series with
Voltage value a little is connected in series with, that is, acquires sensitive resistance RT and measuring resistance R in sensitive resistance branch 2021 and is connected with each other one end
Voltage Vx, two measuring resistances being connected in series with are acquired by the second voltage acquisition channel circuit 2011b of ADC units 2011
Voltage value a little is connected in series between R, that is, acquires two serial standard resistance R in measuring resistance branch 2022 and is connected with each other one end
Voltage Vref, according to Ohm's law：
Vio=2 ╳ Vref (3)
(2Vref-Vx)/RR=Vx/RRT (4)
RRT=Vx╳RR/(2Vref-Vx) (5)
From formula (5), it can be seen that the error impact factor for influencing sensitive resistance RT resistance values includes：Vx、VrefAnd RR。
VrefAnd VxThe first voltage acquisition channel circuit 2011a of ADC units 2011 and second voltage acquisition channel circuit can be passed through
2011b is collected, and in order to ensure the stability of measuring resistance R, measuring resistance R can select fixed value resistance, and selected high-precision
The customization resistance of degree, for example, precision is ± 0.5% or ± 1% high-precision fixed value resistance.The first voltage of ADC units 2011
The voltage V of acquisition channel circuit 2011a acquisitionsxWith the V of second voltage acquisition channel circuit 2011b acquisitionsref, two voltage values
Variation can be with reference voltage VbEqual proportion changes.
Specifically, as described in the background art, due to reference voltage VbError, lead to what ADC units 2011 measured
Voltage value VxThere may be errors.But structure as shown in Figure 2, two voltage acquisition channel circuits of ADC units 2011
Same reference voltage V is used when (2011a and 2011b) is measuredb, the ratio of measurement error is identical, therefore, can be eliminated
Fall VxAnd VrefError influence.For example, if first voltage acquisition channel circuit 2011a and second voltage acquisition channel electricity
Road 2011b uses same reference voltage Vb, reference voltage VbUp/down inclined 10%, then correspondingly, first voltage acquisition channel circuit
The voltage while up/down inclined 10% that 2011a and second voltage acquisition channel circuit 2011b are measured.Then according to formula (5) it is found that
Work as VrefAnd VxMeasurement error ratio it is identical, it is assumed that be all in equal proportion inclined 10%, then the voltage value measured is respectively
1.1VrefAnd 1.1Vx, then the resistance value of sensitive resistance RT be：
RRT=1.1Vx╳RR/(2╳1.1Vref-1.1╳Vx)=Vx╳RR/(2Vref-Vx) (6)
Due to V it can be seen from formula (6)xAnd VrefUsing same reference voltage Vb, in measurement error equal proportion partially
10%, therefore V can be eliminatedxAnd VrefError influence, then error of the measurement error of sensitive resistance RT only with measuring resistance R
Correlation, due to measuring resistance R be fixed value resistance, and if its use high-precision fixed value resistance, provide through this embodiment
It is higher that sensitive resistance measuring device 20 tests the obtained resistance value accuracy of sensitive resistance.
Sensitive resistance measuring device provided in this embodiment, including MCU circuits, measuring circuit；MCU circuits include：With
In the ADC units of acquisition measuring circuit voltage value, for the power supply I/O interface powered for measuring circuit；Wherein, ADC units packet
It includes：First voltage acquisition channel circuit, second voltage acquisition channel circuit；Measuring circuit includes：The sensitive resistance being connected in parallel
Branch and measuring resistance branch；Wherein, sensitive resistance branch includes the sensitive resistance RT being connected in series with and measuring resistance R；Standard
Circuit branch includes two measuring resistance R being connected in series with；First voltage acquisition channel circuit is connected in series with quick for acquisition
Voltage value a little is connected in series between sensing resistor RT and measuring resistance R；Second voltage acquisition channel circuit connects for acquiring series connection
Voltage value a little is connected in series between the two measuring resistance R connect.The sensitive resistance measuring device by acquisition be connected in parallel and
The voltage of two branches of sensitive resistance branch and measuring resistance branch of resistance symmetric configuration realizes the voltage measurement of two branches
Equal proportion variation is presented in error, so as to eliminate influence of the voltage measurement error to sensitive resistance resistance value, then through this embodiment
The accuracy of the sensitive resistance resistance value of the sensitive resistance measuring device test of offer is higher.
Fig. 3 is the structure diagram of the sensitive resistance measuring device shown in another exemplary embodiment of the present invention, such as Fig. 3 institutes
Show, on the basis of embodiment shown in Fig. 2, further include：Power supply branch 203；Power supply branch 203 accesses power supply I/O interface 2012
In the circuit that measuring circuit 202 is powered；Power supply branch 203 includes：Selecting switch 2031, capacitance C；Selecting switch 2031 includes two
A switch contact；First switch contact a is used to connect the circuit of capacitance C and power supply I/O interface 2012, so that power supply I/O interface
2012 charge for capacitance C；Second switch contact b is for connecting capacitance C and the circuit of measuring circuit 202, so that capacitance C is measures
Circuit 202 is powered.
Specifically, that includes for acquiring the ADC units 2011 of 202 voltage value of measuring circuit and be used for for MCU circuits 201
The power supply I/O interface 2012 powered for measuring circuit 202.ADC units 2011 include the circuit there are two collection voltages, i.e., and the
One voltage acquisition channel circuit 2011a and second voltage acquisition channel circuit 2011b, can collect measuring circuit 202 respectively
Two points voltage value, to ADC units 2011 two collection voltages circuit power reference voltage be Vb.Power supply IO connects
Mouth 2012 connects measuring circuits 202, and output supply voltage VioIt powers for measuring circuit 202.
Measuring circuit 202, including the sensitive resistance branch 2021 being connected in parallel and measuring resistance branch 2022.Wherein, it is quick
Sensing resistor branch 2021 is composed in series by measuring resistance R and sensitive resistance RT.The layout relationship of measuring resistance R and sensitive resistance RT
It can be with as shown in figure 3, measuring resistance R one end connects selecting switch 2031, other end connection sensitive resistance RT.Sensitive resistance RT mono-
End ground connection, other end connection measuring resistance R.Measuring resistance branch 2022 is composed in series by two measuring resistance R, two series connection
Measuring resistance R one end is connected with each other, the other end ground connection of a measuring resistance R, the other end connection choosing of another measuring resistance R
Select switch 2031.
Power supply branch 203 includes：Selecting switch 2031 and capacitance C；Selecting switch 2031 includes two switch contacts；It is optional
The switch contact a of connection power supply I/O interface 2012 is selected, connection sensitive resistance branch 2021 and measuring resistance branch also may be selected
2022 switch contact b in parallel.As 2031 connecting valve contact a of selecting switch, by power supply I/O interface 2012 to capacitance C into
Row charging；As 2031 connecting valve contact b of selecting switch, capacitance C starts to discharge, and is sensitive resistance branch 2021 and standard electric
Resistance branch 2022 is powered.When sensitive resistance measuring device 20 is in idle condition, 2031 connecting valve contact a of selecting switch,
It is charged by power supply I/O interface 2012 for capacitance C, stores electric energy；Sensitive resistance RT is carried out when waking up sensitive resistance measuring device 20
During resistance measurement, then 2031 connecting valve contact b of selecting switch, capacitance C start to discharge, and power for measuring circuit 202, start
Acquire VrefAnd VxVoltage value.Therefore, sensitive resistance measuring device 20 shown in Fig. 3 is in addition to that can obtain high quick of accuracy
The resistance value of sensing resistor can also charge to capacitance C when without measuring, perform and stop carrying out capacitance C when measuring
Charging, it is low in energy consumption so as to have the advantages that, meanwhile, because it is capacitance C rather than power supply I/O interface to power for measuring circuit 202
The supply voltage V of 2012 outputsio, so that supply voltage VioThe influence of the suffered fluctuation of load will not feed through to measurement
Circuit 202, so as to further ensure the accuracy of sensitive resistance RT resistance measurements.
Sensitive resistance measuring device 20 shown in Fig. 3, the course of work are：It is carried by capacitance C electric discharges for measuring circuit 202
Power supply source voltage Vio, acquired in sensitive resistance branch 2021 by the first voltage acquisition channel circuit 2011a of ADC units 2011
Sensitive resistance RT connect the voltage V of one end with measuring resistance Rx, pass through the second voltage acquisition channel circuit of ADC units 2011
The voltage that two series resistances are connected with each other one end in 2011b acquisition measuring resistances branch 2022 is Vref, ADC units 2011
Two voltage acquisition channels use same reference voltage V when implementing to measureb, the error rate measured is identical, can be disappeared
Except VxAnd VrefError influence, then the measurement error of sensitive resistance RT is only related to the error of measuring resistance R, due to standard electric
High-precision fixed value resistance may be used in resistance R, then the sensitivity that the sensitive resistance measuring device 20 provided through this embodiment is tested
The precision of resistance RT resistance values is higher.Wherein, the computing the resistor value method of sensitive resistance RT and sensitive resistance measuring device shown in Fig. 2
20 is identical, when first voltage acquisition channel circuit 2011a and second voltage acquisition channel circuit 2011b uses same reference voltage
Vb, reference voltage Vb up/down inclined 10%, then correspondingly, first voltage acquisition channel circuit 2011a and second voltage acquisition channel
The voltage while up/down inclined 10% that circuit 2011b is measured.Then according to formula (5) it is found that working as VrefAnd VxMeasurement error ratio
It is identical, it is assumed that be all in equal proportion inclined 10%, then the voltage value measured is respectively 1.1VrefAnd 1.1Vx, then sensitive resistance
The resistance value of RT is：
RRT=1.1Vx╳RR/(2╳1.1Vref-1.1╳Vx)=Vx╳RR/(2Vref-Vx) (6)
Due to V it can be seen from formula (6)xAnd VrefUsing same reference voltage Vb, in measurement error equal proportion partially
10%, therefore V can be eliminatedxAnd VrefError influence, then error of the measurement error of sensitive resistance RT only with measuring resistance R
Correlation, due to measuring resistance R be fixed value resistance, and if its use high-precision fixed value resistance, provide through this embodiment
It is higher that sensitive resistance measuring device 20 tests the obtained resistance value accuracy of sensitive resistance.Meanwhile branch 203 of powering also provides not
It charges when measuring to capacitance C, stops the function of charging to capacitance C during measurement, have the advantages that low in energy consumption；And due to using
Capacitance C substitute electric powers I/O interface 2012 is powered to measuring circuit 202 so that supply voltage VioThe influence of the suffered fluctuation of load
Measuring circuit 202 will not be fed through to, further ensure the accuracy of sensitive resistance RT resistance measurements.
Fig. 4 is the structure diagram of the sensitive resistance measuring device shown in another exemplary embodiment of the present invention, such as Fig. 4 institutes
Show, on the basis of embodiment shown in Fig. 2, by the position of the measuring resistance R in sensitive resistance branch 2021 and measuring resistance R
It exchanges.That is, in sensitive resistance measuring device 20 shown in Fig. 2, one of measuring resistance R in sensitive resistance branch 2021
End is connect with power supply I/O interface 2012, and the other end is connect respectively with sensitive resistance RT and first voltage acquisition channel circuit 2011a；
In sensitive resistance measuring device 20 shown in Fig. 4, one end and the power supply IO of the sensitive resistance RT in sensitive resistance branch 2021 connect
Mouth 2012 connects, and the other end is connect respectively with measuring resistance R and first voltage acquisition channel circuit 2011a.
Specifically, the sensitive resistance that sensitive resistance measuring device 20 and Fig. 2 that the present embodiment is provided is provided is measured and is filled
The difference part for putting 20 is that the position of the measuring resistance R and sensitive resistance RT of sensitive resistance branch 2021 are different, sensitive resistance
RT one end connection power supply I/O interface 2012, other end connection measuring resistance R.Measuring resistance R one end is grounded, and other end connection is sensitive
Resistance RT.
As shown in Figure 4, by power supply I/O interface 2012 supply voltage V is provided for measuring circuit 202io, pass through ADC units
Sensitive resistance RT and measuring resistance R connects in 2011 first voltage acquisition channel circuit 2011a acquisition sensitive resistances branch 2021
The voltage Vx of one end is met, measuring resistance branch 2022 is acquired by the second voltage acquisition channel circuit 2011b of ADC units 2011
In two series resistance R be connected with each other the voltage of one end as Vref, according to Ohm's law：
Vio=2 ╳ Vref (7)
(2Vref-Vx)/RRT=Vx/RR (8)
RRT=(2Vref–Vx)╳RR/Vx (9)
Due to reference voltage VbError, ADC units 2011 measure voltage value there may be errors.ADC units 2011
Two voltage acquisition channel measurements when use same reference voltage Vb, the error rate measured is identical, can eliminate Vx
And VrefError influence.Such as first voltage acquisition channel circuit 2011a and second voltage acquisition channel circuit 2011b is used
Same reference voltage Vb, reference voltage VbUp/down inclined 10%, then first voltage acquisition channel circuit 2011a and second voltage acquisition
The voltage while up/down inclined 10% that channel circuit 2011b is measured.According to formula (9) it is found that working as VxAnd VrefError rate phase
Together, it is assumed that be all in equal proportion inclined 10%, then the voltage value measured is respectively 1.1VrefAnd 1.1Vx, then sensitive resistance RT
Resistance value RRTFor：
RT=(2 ╳, 1.1 ╳ Vref -1.1Vx) ╳ R/1.1Vx=(2Vref-Vx) ╳ R/Vx (10)
Due to V it can be seen from formula (10)xAnd VrefUsing same reference voltage Vb, in measurement error equal proportion partially
10%, therefore V can be eliminatedxAnd VrefError influence, then mistake of the measurement error of sensitive resistance RT only with measuring resistance R
Fixed value resistance may be used in difference correlation, measuring resistance R, it is furthermore preferred that using high-precision fixed value resistance, then through this embodiment
The precision for the sensitive resistance RT resistance values that the sensitive resistance measuring device 20 of offer is tested is higher.
Fig. 5 is the structure diagram of the sensitive resistance measuring device shown in another exemplary embodiment of the present invention, such as Fig. 5 institutes
Show, on the basis of embodiment shown in Fig. 3, by the position of the measuring resistance R in sensitive resistance branch 2021 and measuring resistance R
It exchanges.That is, in sensitive resistance measuring device 20 shown in Fig. 3, one of measuring resistance R in sensitive resistance branch 2021
End is connect with second switch contact b, and the other end is connect respectively with sensitive resistance RT and first voltage acquisition channel circuit 2011a；
In sensitive resistance measuring device 20 shown in fig. 5, one end of the sensitive resistance RT in sensitive resistance branch 2021 and second switch
Contact b connections, the other end are connect respectively with measuring resistance R and first voltage acquisition channel circuit 2011a.
Specifically, the sensitive resistance that sensitive resistance measuring device 20 and Fig. 3 that the present embodiment is provided is provided is measured and is filled
The difference part for putting 20 is that the position of the measuring resistance R and sensitive resistance RT of sensitive resistance branch 2021 are different, sensitive resistance
RT one end connects selecting switch 2031, other end connection measuring resistance R.Measuring resistance R one end is grounded, other end connection sensitive electrical
Hinder RT.Wherein, the computing the resistor value method of sensitive resistance RT is identical with sensitive resistance measuring device 20 shown in Fig. 4, first voltage
Acquisition channel circuit 2011a and second voltage acquisition channel circuit 2011b uses same reference voltage Vb, reference voltage VbUp/down
Inclined 10%, then the voltage that first voltage acquisition channel circuit 2011a and second voltage acquisition channel circuit 2011b are measured is simultaneously
Up/down inclined 10%.According to formula (9) it is found that working as VxAnd VrefError rate it is identical, it is assumed that be all in equal proportion inclined 10%, then
The voltage value measured is respectively 1.1VrefAnd 1.1Vx, then the resistance value R of sensitive resistance RTRTFor：
RT=(2 ╳, 1.1 ╳ Vref -1.1Vx) ╳ R/1.1Vx=(2Vref-Vx) ╳ R/Vx (10)
Due to V it can be seen from formula (10)xAnd VrefUsing same reference voltage Vb, in measurement error equal proportion partially
10%, therefore V can be eliminatedxAnd VrefError influence, then mistake of the measurement error of sensitive resistance RT only with measuring resistance R
Fixed value resistance may be used in difference correlation, measuring resistance R, it is furthermore preferred that using high-precision fixed value resistance, then through this embodiment
The precision for the sensitive resistance RT resistance values that the sensitive resistance measuring device 20 of offer is tested is higher.
Fig. 6 is the sensitive resistance measuring method shown in an exemplary embodiment of the invention, as shown in fig. 6, the present embodiment
Sensitive resistance measuring method can be based on Fig. 2 or shown in Fig. 4 sensitive resistances measuring device 20 and implement to measure, measuring method tool
Body includes：
Step 601 receives sensitive resistance measurement instruction.
Step 602, according to sensitive resistance measurement instruction, obtain that first voltage acquisition channel circuit measuring obtains respectively the
The second voltage value that one voltage value and second voltage acquisition channel circuit measuring obtain.
Step 603, resistance value, the first voltage value, second voltage value according to measuring resistance R, determine the resistance of sensitive resistance RT
Value.
Specifically, for receiving the place that the processor of the sensitive resistance measurement instruction can be integrated in MCU circuits 201
The processor outside device or the sensitive resistance measuring device 20 is managed, is kept in communication interaction with MCU circuits 201, so that
The instruction that MCU circuits 201 manage device according to this performs corresponding operation, for example, processor receives sensitive resistance measurement instruction
Afterwards, it triggers the MCU circuits 201 to power to measuring circuit 202, so that ADC units 2011 acquire sensitive resistance branch 2021 and mark
The voltage of quasi- resistance branch 2022 is to obtain the resistance value of sensitive resistance RT.
Based on sensitive resistance measuring device shown in Fig. 2, that is, if one of measuring resistance R in sensitive resistance branch 2021
End is connect with power supply I/O interface 2012, and the other end is connect respectively with sensitive resistance RT and first voltage acquisition channel circuit 2011a,
Wherein, sensitive resistance RT one end is grounded；Then the first voltage value is the voltage value at sensitive resistance RT both ends；Then correspondingly, step 603
Middle resistance value, the first voltage value, second voltage value according to measuring resistance R determines that the resistance value of sensitive resistance RT specifically includes：
According to RRT=Vx ╳ RR/ (2Vref-Vx) determines the resistance value of sensitive resistance RT；Wherein, RRTRepresent sensitive resistance RT
Resistance value, Vx represent the first voltage value, RRRepresent the resistance value of measuring resistance R, Vref represents second voltage value.
Sensitive resistance measuring device based on shown in Fig. 4, that is, if one of sensitive resistance RT in sensitive resistance branch 2021
End is connect with power supply I/O interface 2012, and the other end is connect respectively with measuring resistance R and first voltage acquisition channel circuit 2011a,
Wherein, measuring resistance R one end is grounded；Then the first voltage value is the voltage value at measuring resistance R both ends；Then correspondingly, in step 603
According to the resistance value, the first voltage value, second voltage value of measuring resistance R, determine that the resistance value of sensitive resistance RT specifically includes：
According to RRT=(2Vref-Vx) ╳ RR/ Vx determines the resistance value of sensitive resistance RT；Wherein, RRTRepresent sensitive resistance RT
Resistance value, Vx represent the first voltage value, RRRepresent the resistance value of measuring resistance R, Vref represents second voltage value.
The sensitive resistance measuring method of the present embodiment, based on sensitive resistance measuring device, which includes MCU circuits, surveys
Measure circuit；MCU circuits include：For acquiring the ADC units of measuring circuit voltage value, for the power supply IO to power for measuring circuit
Interface；Wherein, ADC units include：First voltage acquisition channel circuit, second voltage acquisition channel circuit；Measuring circuit includes：
The sensitive resistance branch and measuring resistance branch being connected in parallel；Wherein, sensitive resistance branch includes the sensitive resistance being connected in series with
RT and measuring resistance R；Preferred circuit branch includes two measuring resistance R being connected in series with；First voltage acquisition channel circuit is used
Voltage value a little is connected in series between the sensitive resistance RT and measuring resistance R that are connected in series in acquisition；Second voltage acquisition channel
Voltage value a little is connected in series between two measuring resistance R that circuit is connected in series with for acquisition.By above device, obtain respectively
It gets the first voltage value that first voltage acquisition channel circuit measuring obtains and second voltage acquisition channel circuit measuring obtains
Second voltage value, due to sensitive resistance branch and the parallel-connection structure of measuring resistance branch, and the resistance of two branches is symmetrical,
So that equal proportion variation is presented in the voltage measurement error of two voltage values, sensitive resistance is hindered so as to eliminate voltage measurement error
The influence of value so that the accuracy of sensitive resistance resistance value that the sensitive resistance measuring device based on the present embodiment is tested carries
It rises.
Fig. 7 is the sensitive resistance measuring method shown in another exemplary embodiment of the present invention, as shown in fig. 7, the present embodiment
Sensitive resistance measuring method can be based on Fig. 3 or shown in fig. 5 sensitive resistances measuring device 20 implement measure, the measuring method
It specifically includes：
Step 701 receives sensitive resistance measurement instruction.
Step 702, according to sensitive resistance measurement instruction, send the instruction of first switch contact change-over to selecting switch；First
Switch contact switching command is for making selecting switch from first switch contact change-over to second switch contact, so that power supply I/O interface
Stop to capacitor charging, capacitance is powered to measuring circuit.
Step 703, acquisition first voltage acquisition channel circuit measuring obtains respectively the first voltage value and second voltage are adopted
The second voltage value that collection channel circuit measurement obtains.
Step 704, resistance value, the first voltage value, second voltage value according to measuring resistance R, determine the resistance of sensitive resistance RT
Value.
Specifically, ibid an embodiment, the processor for receiving sensitive resistance measurement instruction can be integrated in MCU electricity
The processor outside processor or the sensitive resistance measuring device 20 in road 201 keeps logical with MCU circuits 201
News interaction, so that the instruction that MCU circuits 201 manage device according to this performs corresponding operation, for example, processor receives sensitive electrical
After hindering measurement instruction, trigger the MCU circuits 201 and send the instruction of first switch contact change-over to selecting switch 2031, so that selection
Switch 2031 is switched to second switch contact b from first switch contact a so that the sensitive resistance measuring device 20 is from idle state
Conversion is in working condition, and when so-called idle state is exactly that first switch contact a is closed, power supply I/O interface 2012 charges to capacitance C,
Store the state of electric energy；When so-called working condition is exactly that second switch contact b is closed, power supply I/O interface 2012 stops to capacitance C
Charging, the state that capacitance C electric discharges are powered for measuring circuit 202；The sensitive resistance measuring device 20 in the operating condition, perform pair
The measurement of the resistance value of sensitive resistance RT, to determine the resistance value of sensitive resistance RT.After the resistance value that sensitive resistance RT is determined, also
The instruction of second switch contact change-over can be sent to selecting switch；The second switch contact change-over instructs to make selecting switch
2031 are switched to first switch contact a from second switch contact b, so that the circuit between capacitance C and measuring circuit 202 disconnects,
Capacitance C stops powering to measuring circuit 202, the circuit communication between capacitance C and power supply I/O interface 2012, power supply I/O interface 2012
It charges to capacitance C.
Based on sensitive resistance measuring device shown in Fig. 3, that is, if one of measuring resistance R in sensitive resistance branch 2021
End is connect with second switch contact b, and the other end is connect respectively with sensitive resistance RT and first voltage acquisition channel circuit 2011a,
Wherein, sensitive resistance RT one end is grounded；Then the first voltage value is the voltage value at sensitive resistance RT both ends；Then correspondingly, step 704
Middle resistance value, the first voltage value, second voltage value according to measuring resistance R determines that the resistance value of sensitive resistance RT specifically includes：According to
RRT=Vx ╳ RR/ (2Vref-Vx) determines the resistance value of sensitive resistance RT；Wherein, RRTRepresent the resistance value of sensitive resistance RT, Vx is represented
The first voltage value, RRRepresent the resistance value of measuring resistance R, Vref represents second voltage value.
Based on sensitive resistance measuring device shown in fig. 5, that is, if one of sensitive resistance RT in sensitive resistance branch 2021
End is connect with second switch contact b, and the other end is connect respectively with measuring resistance R and first voltage acquisition channel circuit 2011a,
In, measuring resistance R one end ground connection；Then the first voltage value is the voltage value at measuring resistance R both ends；Then correspondingly, root in step 704
According to the resistance value, the first voltage value, second voltage value of measuring resistance R, determine that the resistance value of sensitive resistance RT specifically includes：According to RRT=
(2Vref–Vx)╳RR/ Vx determines the resistance value of sensitive resistance RT；Wherein, RRTRepresent the resistance value of sensitive resistance RT, Vx represents first
Voltage value, RRRepresent the resistance value of measuring resistance R, Vref represents second voltage value.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic；
And these modifications or replacement, the range for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of sensitive resistance measuring device, which is characterized in that including：MCU circuits, measuring circuit；
The MCU circuits include：For acquiring the ADC units of the measuring circuit voltage value, for being supplied for the measuring circuit
The power supply I/O interface of electricity；Wherein, the ADC units include：First voltage acquisition channel circuit, second voltage acquisition channel electricity
Road；The first voltage acquisition channel circuit is identical with the reference voltage of the second voltage acquisition channel circuit；
The measuring circuit includes：The sensitive resistance branch and measuring resistance branch being connected in parallel；Wherein, the sensitive resistance branch
Road includes the sensitive resistance RT being connected in series with and measuring resistance R；The preferred circuit branch includes two standards being connected in series with
Resistance R；
The first voltage acquisition channel circuit is used to acquire the sensitive resistance RT being connected in series with and the standard electric
Voltage value a little is connected in series between resistance R；
The second voltage acquisition channel circuit is used for series connection between acquiring two measuring resistance R being connected in series with and connects
The voltage value of contact.
2. sensitive resistance measuring device according to claim 1, which is characterized in that further include：Power supply branch；
The power supply branch is accessed in circuit of the power supply I/O interface for measuring circuit power supply；
The power supply branch includes：Selecting switch, capacitance；
The selecting switch includes two switch contacts；First switch contact is used to connect the capacitance and the power supply I/O interface
Circuit so that the power supply I/O interface be the capacitor charging；Second switch contact is used to connect the capacitance and the survey
The circuit of circuit is measured, so that the capacitance is powered for the measuring circuit.
3. sensitive resistance measuring device according to claim 1, which is characterized in that
One end of measuring resistance R in the sensitive resistance branch is connect with the power supply I/O interface, the other end and the sensitivity
Resistance RT and the first voltage acquisition channel circuit connect respectively；
Alternatively,
One end of sensitive resistance RT in the sensitive resistance branch is connect with the power supply I/O interface, the other end and the standard
Resistance R and the first voltage acquisition channel circuit connect respectively.
4. sensitive resistance measuring device according to claim 2, which is characterized in that
One end of measuring resistance R in the sensitive resistance branch and the second switch contact portion, the other end with it is described quick
Sensing resistor RT and the first voltage acquisition channel circuit connect respectively；
Alternatively,
One end of sensitive resistance RT in the sensitive resistance branch and the second switch contact portion, the other end and the mark
Quasi- resistance R and the first voltage acquisition channel circuit connect respectively.
5. according to Claims 1 to 4 any one of them sensitive resistance measuring device, which is characterized in that
The measuring resistance R is fixed value resistance.
6. a kind of sensitive resistance measuring method, the method is implemented to survey using sensitive resistance measuring device described in claim 1
Amount, which is characterized in that including：
Receive sensitive resistance measurement instruction；
According to the sensitive resistance measurement instruction, the first electricity that the first voltage acquisition channel circuit measuring obtains is obtained respectively
The second voltage value that pressure value and the second voltage acquisition channel circuit measuring obtain；
According to the resistance value, the first voltage value, the second voltage value of the measuring resistance R, the sensitive resistance RT is determined
Resistance value.
7. if according to the method described in claim 6, it is characterized in that, one of measuring resistance R in the sensitive resistance branch
End is connect with the power supply I/O interface, and the other end connects respectively with the sensitive resistance RT and the first voltage acquisition channel circuit
It connects, wherein, sensitive resistance RT one end ground connection；Then the first voltage value is the voltage value at the sensitive resistance RT both ends；
Correspondingly, the resistance value, the first voltage value, the second voltage value according to the measuring resistance R, determines the sensitivity
The resistance value of resistance RT, including：
According to RRT=Vx╳RR/ (2Vref-Vx) determines the resistance value of the sensitive resistance RT；
Wherein, the RRTRepresent the resistance value of the sensitive resistance RT, the Vx represents the first voltage value, the RRRepresent institute
The resistance value of measuring resistance R is stated, the Vref represents the second voltage value.
8. if according to the method described in claim 6, it is characterized in that, one of sensitive resistance RT in the sensitive resistance branch
End is connect with the power supply I/O interface, and the other end connects respectively with the measuring resistance R and the first voltage acquisition channel circuit
It connects, wherein, measuring resistance R one end ground connection；Then the first voltage value is the voltage value at the measuring resistance R both ends；Phase
It answers, the resistance value, the first voltage value, the second voltage value according to the measuring resistance R determines the sensitive electrical
The resistance value of RT is hindered, including：
According to RRT=(2Vref-Vx) ╳ RR/ Vx determines the resistance value of the sensitive resistance RT；
Wherein, the RRTRepresent the resistance value of the sensitive resistance RT, the Vx represents the first voltage value, the RRRepresent institute
The resistance value of measuring resistance R is stated, the Vref represents the second voltage value.
9. a kind of sensitive resistance measuring method, the method is implemented to survey using the sensitive resistance measuring device described in claim 2
Amount, which is characterized in that including：
Receive sensitive resistance measurement instruction；
According to the sensitive resistance measurement instruction, the instruction of first switch contact change-over is sent to the selecting switch；Described first
Switch contact switching command is used to make the selecting switch from the first switch contact change-over to the second switch contact, with
The power supply I/O interface is made to stop to the capacitor charging, the capacitance is powered to the measuring circuit；
The first voltage value that the first voltage acquisition channel circuit measuring obtains is obtained respectively and second voltage acquisition is logical
The second voltage value that road circuit measuring obtains；
According to the resistance value, the first voltage value, the second voltage value of the measuring resistance R, the sensitive resistance RT is determined
Resistance value.
10. according to the method described in claim 9, it is characterized in that, after the resistance value for determining the sensitive resistance RT, go back
Including：
The instruction of second switch contact change-over is sent to the selecting switch；The second switch contact change-over instruction is described for making
Selecting switch from the second switch contact change-over to the first switch contact so that the capacitance and the measuring circuit it
Between circuit disconnect, the capacitance stop to the measuring circuit power, the electricity between the capacitance and the power supply I/O interface
Road connects, and the power supply I/O interface is to the capacitor charging.
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| CN201810046191.3A CN108226646B (en) | 2018-01-17 | 2018-01-17 | Sensitive resistance measuring device and measuring method |
| CN202110946707.1A CN113589045A (en) | 2018-01-17 | 2018-01-17 | Sensitive resistance measuring device and measuring method |
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| CN201810046191.3A CN108226646B (en) | 2018-01-17 | 2018-01-17 | Sensitive resistance measuring device and measuring method |
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| CN201810046191.3A Active CN108226646B (en) | 2018-01-17 | 2018-01-17 | Sensitive resistance measuring device and measuring method |
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| CN110488889A (en) * | 2019-07-11 | 2019-11-22 | 湖南明康中锦医疗科技发展有限公司 | A kind of Breathing Suppotion device temperature collection control method and system |
| CN112596569A (en) * | 2020-12-17 | 2021-04-02 | 江苏科大亨芯半导体技术有限公司 | Circuit and method for calibrating internal resistance of photoelectric integrated chip |
| CN113466698A (en) * | 2021-06-24 | 2021-10-01 | 安徽锐能科技有限公司 | Fill CC signal resistance detection circuitry slowly and rifle that charges |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108226646B (en) | 2022-02-22 |
| CN113589045A (en) | 2021-11-02 |
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