CN108088472A - Signal sampling device, method and electrical equipment - Google Patents
Signal sampling device, method and electrical equipment Download PDFInfo
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- CN108088472A CN108088472A CN201711297804.2A CN201711297804A CN108088472A CN 108088472 A CN108088472 A CN 108088472A CN 201711297804 A CN201711297804 A CN 201711297804A CN 108088472 A CN108088472 A CN 108088472A
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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
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
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Abstract
The invention discloses a kind of signal sampling device, method and electrical equipment, wherein, signal sampling device includes：Sensor unit, sensor unit include feeder ear, and sensor unit by detecting parameter to be measured to export detection signal in real time；AD conversion unit, AD conversion unit is connected with sensor unit, AD conversion unit includes reference voltage end, reference voltage end is connected after being connected with the feeder ear of sensor unit with default reference power source, and AD conversion unit to detection signal by carrying out analog-to-digital conversion with output digit signals；Micro-control unit, micro-control unit are connected with AD conversion unit, and micro-control unit obtains the real signal value of parameter to be measured according to digital signal.The reference voltage and sensor unit of the AD conversion unit of the device are powered using common power supply, so as to so that measurement result substantially increases measurement accuracy, and cost is relatively low from the influence of reference power source.
Description
Technical field
The present invention relates to technical field of electric appliances, more particularly to a kind of signal sampling device, a kind of electrical equipment and a kind of letter
Number method of sampling.
Background technology
In correlation technique, signal sampling device generally uses structure as shown in Figure 1.ADC(Analog-to-Digital
Converte, analog-digital converter) gather the detection signal (voltage signal or current signal) that sensor unit exports, MCU
The detection signal output measured value that (Microcontroller Unit, micro-control unit) is exported according to ADC.
Wherein, as shown in Figure 1, the reference voltage and sensor unit of ADC have corresponding power supply (VCC1 respectively
And VCC2).The measurement result of ADC and precision, the stability of the power supply VCC1 of reference voltage have direct relation, sensing
The output result of device unit and precision, the stability of its power supply VCC2 have direct relation, therefore, the measured value of MCU outputs
Measurement accuracy influenced by the precision and stability of VCC1 and VCC2.
In order to improve measurement accuracy, although the power supply of higher precision and stability can be used, which is used
Measurement accuracy to be promoted be also limited, and cost of hardware design can be increased.
The content of the invention
The present invention is that the understanding of problems with and research are made based on inventor：
In correlation technique, as shown in Figure 1, signal sampling device can include sensor unit, ADC and MCU, sensor list
Member gathers the power of parameter (pressure, temperature etc.) to be measured, and exports electric signal VO to ADC.ADC is according to electric signal VO with code
Form output digit signals OUTCOAD is to MCU, so that MCU obtains the real signal value Vm of parameter to be measured according to digital signal.
Under normal circumstances, the ratio of VO and VCC2 is multiplied by the real signal value Vm that range is parameter to be measured, i.e.,：
Vm=(VO/V2) * A (1)
Wherein, Vm is the real signal value (such as pressure value, temperature value) of parameter to be measured, and VO is the output of sensor unit
Electric signal, A be sensor unit Full-span output value, V2 be sensor unit power supply voltage value.
And electric signal VO general satisfactions the following formula (2) of the output of sensor unit：
VO=(OUTCODE/ACODE) * V1 (2)
Wherein, VO is the electric signal of the output of sensor unit, and OUTCODE is digital signal, and ACODE is full scale number
Signal value output, V1 are the voltage value of the power supply of the reference voltage of ADC.It will be apparent that the reference voltage of ADC
The stability and precision of power supply VCC1 determines that MCU collects the stability and precision of digital signal OUTCODE.
Formula (2) is substituted into formula (1) can obtain the following formula (3)：
Wherein, Vm is the real signal value of parameter to be measured, and OUTCODE is digital signal, and ACODE is full scale digital signal
Output valve, V1 are the voltage value of the power supply of the reference voltage of ADC, and V2 is the voltage of the power supply of sensor unit
Value.
From formula (3), the measurement accuracy of the real signal value Vm of parameter to be measured by VCC1 and VCC2 precision with it is steady
Surely the influence spent.In practical application, ripple, temperature coefficient, null offset of VCC1 and VCC2 etc. can be to VCC1 and VCC2
Precision is formed with stability to be influenced, so as to which measurement result can be caused inaccurate.
It is contemplated that it solves at least some of the technical problems in related technologies.For this purpose, the present invention
First purpose is to propose a kind of signal sampling device, the reference voltage and sensor of the AD conversion unit of the device
Unit is powered using common power supply, so as to so that measurement result substantially increases survey from the influence of reference power source
Accuracy of measurement, and cost is relatively low.
Second object of the present invention is to propose a kind of electrical equipment.
Third object of the present invention is to propose a kind of signal sampling method.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of signal sampling device, including：Sensor
Unit, the sensor unit include feeder ear, and the sensor unit exports detection letter by detecting parameter to be measured in real time
Number；AD conversion unit, the AD conversion unit are connected with the sensor unit, and the AD conversion unit includes benchmark
Reference voltage end, the reference voltage end be connected with the feeder ear of the sensor unit after with default reference power source phase
Even, the AD conversion unit to the detection signal by carrying out analog-to-digital conversion with output digit signals；Micro-control unit, institute
It states micro-control unit with the AD conversion unit to be connected, the micro-control unit obtains described to be measured according to the digital signal
The real signal value of parameter.
Signal sampling device according to embodiments of the present invention detects parameter to be measured by sensor unit to export inspection in real time
Survey signal, the reference voltage end of AD conversion unit bag be connected with the feeder ear of sensor unit after with default with reference to electricity
Source is connected, and AD conversion unit carries out detection signal analog-to-digital conversion with output digit signals, and micro-control unit is believed according to number
Number obtain the real signal value of parameter to be measured.The reference voltage of the AD conversion unit of the device and sensor list as a result,
Member is powered using common power supply, so as to so that measurement result substantially increases measurement from the influence of reference power source
Precision, and cost is relatively low.
In addition, the signal sampling device that above-described embodiment proposes according to the present invention can also have following supplementary technology spy
Sign：
According to one embodiment of present invention, the sensor unit includes temperature sensor and/or pressure sensor.
According to one embodiment of present invention, the parameter to be measured includes temperature and/or pressure.
According to one embodiment of present invention, the detection signal is voltage signal or current signal.
According to one embodiment of present invention, the real signal value of the parameter to be measured meets the following formula：Vm=
(OUTCODE/ACODE) * A, wherein, Vm is the real signal value of the parameter to be measured, and OUTCODE is the digital signal,
ACODE is full scale digital signal output valve, and A is Full-span output value.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of electrical equipment, including the present invention the
Signal sampling device described in one side embodiment.
The electrical equipment of the embodiment of the present invention passes through above-mentioned signal sampling device, the reference of AD conversion unit
Voltage and sensor unit are powered using common power supply, so as to so that measurement result from power supply influence,
Measurement accuracy is substantially increased, and cost is relatively low.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of signal sampling method, including following step
Suddenly：Parameter to be measured is detected in real time by sensor unit to export detection signal, wherein, the sensor unit includes power supply
End；Analog-to-digital conversion is carried out with output digit signals to the detection signal by AD conversion unit, wherein, the analog-to-digital conversion
Unit include reference voltage end, the reference voltage end be connected with the feeder ear of the sensor unit after with it is default
Reference power source be connected；The real signal value of the parameter to be measured is obtained according to the digital signal.
Signal sampling method according to embodiments of the present invention, first, detected in real time by sensor unit parameter to be measured with
Output detection signal, then analog-to-digital conversion is carried out with output digit signals, analog-to-digital conversion to detection signal by AD conversion unit
The reference voltage end of unit is connected after being connected with the feeder ear of sensor unit with default reference power source, finally, according to
Digital signal obtains the real signal value of parameter to be measured.This method can make influence of the measurement result from power supply as a result,
Measurement accuracy is substantially increased, and cost is relatively low.
In addition, the signal sampling method that above-described embodiment proposes according to the present invention can also have following supplementary technology spy
Sign：
According to one embodiment of present invention, the sensor unit includes temperature sensor and/or pressure sensor, institute
Stating parameter to be measured includes temperature and/or pressure.
According to one embodiment of present invention, the detection signal is voltage signal or current signal.
According to one embodiment of present invention, the real signal value of the parameter to be measured meets the following formula：Vm=
(OUTCODE/ACODE) * A, wherein, Vm is the real signal value of the parameter to be measured, and OUTCODE is the digital signal,
ACODE is full scale digital signal output valve, and A is Full-span output value.
Description of the drawings
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein,
Fig. 1 is the block diagram of signal sampling device in correlation technique；
Fig. 2 is the block diagram of signal sampling device according to an embodiment of the invention；And
Fig. 3 is the flow chart of signal sampling method according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the signal sampling device, electrical equipment and signal sampling method of the embodiment of the present invention are described.
Fig. 2 is the block diagram of signal sampling device according to an embodiment of the invention.As shown in Fig. 2, the device
Including：Sensor unit 10, AD conversion unit 20 and micro-control unit 30.
Wherein, sensor unit 10 includes feeder ear U1, and sensor unit 10 by detecting parameter to be measured to export in real time
Detect signal VO.AD conversion unit 20 is connected with sensor unit 10, and AD conversion unit 20 includes reference voltage end
U2, reference voltage end U2 are connected after being connected with the feeder ear U1 of sensor unit with default reference power source VCC, and modulus turns
Unit 20 is changed by carrying out analog-to-digital conversion to detection signal VO with output digit signals OUTCOAD.Micro-control unit 30 and modulus
Converting unit 20 is connected, and micro-control unit 30 obtains the real signal value Vm of parameter to be measured according to digital signal.
In an embodiment of the present invention, it can be voltage signal or current signal to detect signal.The actual letter of parameter to be measured
Number value Vm meets the following formula (4)：
Vm=(OUTCODE/ACODE) * A (4)
Wherein, Vm is the real signal value of parameter to be measured, and OUTCODE is digital signal, and ACODE is full scale digital signal
Output valve, A are Full-span output value.
Specifically, real signal value Vm general satisfactions the following formula (1) of parameter to be measured：
Vm=(VO/V2) * A (1)
Wherein, Vm is the real signal value (such as pressure value, temperature value) of parameter to be measured, and VO is the output of sensor unit
Electric signal, A be sensor unit Full-span output value, V2 be sensor unit power supply voltage value.
And electric signal VO general satisfactions the following formula (2) of the output of sensor unit：
VO=(OUTCODE/ACODE) * V1 (2)
Wherein, VO is the electric signal of the output of sensor unit, and OUTCODE is digital signal, and ACODE is full scale number
Signal value output, V1 are the voltage value of the power supply of the reference voltage of ADC (AD conversion unit 20).It will be apparent that ADC
The stability and precision of the power supply VCC1 of the reference voltage of (AD conversion unit 20) determines MCU (micro-control units
30) stability and precision of digital signal OUTCODE is collected.
Formula (2) is substituted into formula (1) can obtain the following formula (3)：
Wherein, Vm is the real signal value of parameter to be measured, and OUTCODE is digital signal, and ACODE is full scale digital signal
Output valve, V1 are the voltage value of the power supply of the reference voltage of AD conversion unit 20 (ADC), and V2 is sensor unit
The voltage value of 10 power supply.
And in an embodiment of the present invention, as shown in Fig. 2, sensor unit 10 and AD conversion unit 20 use jointly
Reference power source VCC powers, i.e. V1=V2, therefore, the real signal value Vm of parameter to be measured meet the following formula (4)：
Vm=(OUTCODE/ACODE) * A (4)
Wherein, Vm is the real signal value of parameter to be measured, and OUTCODE is digital signal, and ACODE is full scale digital signal
Output valve, A are Full-span output value.
From formula (4), the real signal value Vm of parameter to be measured from sensor unit 10 power supply and modulus
The power supply of the reference voltage of converting unit 20 influences, so as to avoid the ripple due to power supply, temperature system
Number, null offset etc., which form the precision and stability of measurement result, to be influenced, without being equipped with the power supply of higher precision and stability
Power supply can not only improve measurement accuracy, can also reduce hardware spending, cost-effective.
It should be noted that in an embodiment of the present invention, sensor unit 10 can include temperature sensor and/or pressure
Force snesor, parameter to be measured can include temperature and/or pressure.Certainly, sensor unit 10 can also include velocity sensor,
Liquid level sensor, acceleration transducer etc., parameter to be measured can also include speed, liquid level, acceleration etc., not do specific limit herein
System.
Signal sampling device according to embodiments of the present invention detects parameter to be measured by sensor unit to export inspection in real time
Survey signal, the reference voltage end of AD conversion unit bag be connected with the feeder ear of sensor unit after with default with reference to electricity
Source is connected, and AD conversion unit carries out detection signal analog-to-digital conversion with output digit signals, and micro-control unit is believed according to number
Number obtain the real signal value of parameter to be measured.The reference voltage of the AD conversion unit of the device and sensor list as a result,
Member is powered using common power supply, so as to so that measurement result substantially increases measurement from the influence of reference power source
Precision, and cost is relatively low.
In addition, the embodiment of the present invention also proposes a kind of electrical equipment, including above-mentioned signal sampling device.
The electrical equipment of the embodiment of the present invention, by above-mentioned signal sampling device, sensor unit and analog-to-digital conversion list
Member is powered using common reference power source, so as to so that measurement result substantially increases measurement from the influence of power supply
Precision, and cost is relatively low.
Fig. 3 is the flow chart of signal sampling method according to an embodiment of the invention.As shown in figure 3, the signal sampling
Method comprises the following steps：
S1 detects parameter to be measured by sensor unit to export detection signal VO in real time.
Wherein, sensor unit can include temperature sensor and/or pressure sensor, and parameter to be measured can include temperature
And/or pressure.Certainly, sensor unit can also include velocity sensor, liquid level sensor, acceleration transducer etc., to be measured
Parameter can also include speed, liquid level, acceleration etc., do not do and specifically limit herein.
It can be voltage signal or current signal to detect signal VO.
S2 carries out analog-to-digital conversion with output digit signals OUTCOAD by AD conversion unit to detection signal.Wherein,
As shown in Fig. 2, AD conversion unit includes reference voltage end, reference voltage end and the feeder ear phase of sensor unit
It is connected after even with default reference power source VCC.
S3 obtains the real signal value Vm of parameter to be measured according to digital signal OUTCOAD.
In an embodiment of the present invention, the real signal value of parameter to be measured meets the following formula (4)：
Vm=(OUTCODE/ACODE) * A (4)
Wherein, Vm is the real signal value of parameter to be measured, and OUTCODE is digital signal, and ACODE is full scale digital signal
Output valve, A are Full-span output value.
Specifically, real signal value Vm general satisfactions the following formula (1) of parameter to be measured：
Vm=(VO/V2) * A (1)
Wherein, Vm is the real signal value (such as pressure value, temperature value) of parameter to be measured, and VO is the output of sensor unit
Electric signal, A be sensor unit Full-span output value, V2 be sensor unit power supply voltage value.
Electric signal VO general satisfactions the following formula (2) of the output of sensor unit：
VO=(OUTCODE/ACODE) * V1 (2)
Wherein, VO is the electric signal of the output of sensor unit, and OUTCODE is digital signal, and ACODE is full scale number
Signal value output, V1 are the voltage value of the power supply of the reference voltage of AD conversion unit (ADC).It will be apparent that modulus
The stability and precision of the power supply VCC1 of the reference voltage of converting unit (ADC) determines that micro-control unit (MCU) is adopted
Collect the stability and precision of digital signal OUTCODE.
Formula (2) is substituted into formula (1) can obtain the following formula (3)：
Wherein, Vm is the real signal value of parameter to be measured, and OUTCODE is digital signal, and ACODE is full scale digital signal
Output valve, V1 are the voltage value of the power supply of the reference voltage of AD conversion unit (ADC), and V2 is sensor unit
The voltage value of power supply.
And in an embodiment of the present invention, as shown in Fig. 2, sensor unit and AD conversion unit use common reference
Power supply VCC powers, i.e. V1=V2, therefore, the real signal value Vm of parameter to be measured meet the following formula (4)：
Vm=(OUTCODE/ACODE) * A (4)
Wherein, Vm is the real signal value of parameter to be measured, and OUTCODE is digital signal, and ACODE is full scale digital signal
Output valve, A are Full-span output value.
From formula (4), the real signal value Vm of parameter to be measured turns from the power supply and modulus of sensor unit
Changing the power supply of the reference voltage of unit influences, so as to avoid the ripple due to power supply, temperature coefficient, zero
Point drift etc., which forms the precision of measurement result with stability, to be influenced, without being equipped with the power supply of higher precision and stability,
Measurement accuracy can be not only improved, hardware spending can also be reduced, it is cost-effective.
Signal sampling method according to embodiments of the present invention, first, detected in real time by sensor unit parameter to be measured with
Output detection signal, then analog-to-digital conversion is carried out with output digit signals, analog-to-digital conversion to detection signal by AD conversion unit
The reference voltage end of unit is connected after being connected with the feeder ear of sensor unit with default reference power source, finally, according to
Digital signal obtains the real signal value of parameter to be measured.This method can make influence of the measurement result from reference power source as a result,
Measurement accuracy is substantially increased, and cost is relatively low.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features contact directly or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments described in this specification or example and different embodiments or exemplary feature
It closes and combines.
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of signal sampling device, which is characterized in that including：
Sensor unit, the sensor unit include feeder ear, the sensor unit by detect in real time parameter to be measured with
Output detection signal；
AD conversion unit, the AD conversion unit are connected with the sensor unit, and the AD conversion unit includes base
Quasi- reference voltage end, the reference voltage end be connected with the feeder ear of the sensor unit after with default reference power source
It is connected, the AD conversion unit to the detection signal by carrying out analog-to-digital conversion with output digit signals；
Micro-control unit, the micro-control unit are connected with the AD conversion unit, and the micro-control unit is according to the number
The real signal value of parameter to be measured described in word signal acquisition.
2. signal sampling device as described in claim 1, which is characterized in that the sensor unit includes temperature sensor
And/or pressure sensor.
3. signal sampling device as claimed in claim 2, which is characterized in that the parameter to be measured includes temperature and/or pressure.
4. such as the signal sampling device any one of claim 1-3, which is characterized in that the detection signal is believed for voltage
Number or current signal.
5. signal sampling device as described in claim 1, which is characterized in that the real signal value of the parameter to be measured meet with
Lower formula：
Vm=(OUTCODE/ACODE) * A,
Wherein, Vm is the real signal value of the parameter to be measured, and OUTCODE is the digital signal, and ACODE is full scale number
Signal value output, A are Full-span output value.
6. a kind of electrical equipment, which is characterized in that including the signal sampling device as any one of claim 1-5.
7. a kind of signal sampling method, which is characterized in that comprise the following steps：
Parameter to be measured is detected in real time by sensor unit to export detection signal, wherein, the sensor unit includes power supply
End；
Analog-to-digital conversion is carried out with output digit signals to the detection signal by AD conversion unit, wherein, the modulus turns
Changing unit includes reference voltage end, after the reference voltage end is connected with the feeder ear of the sensor unit and pre-
If reference power source be connected；
The real signal value of the parameter to be measured is obtained according to the digital signal.
8. signal sampling method as claimed in claim 7, which is characterized in that the sensor unit includes temperature sensor
And/or pressure sensor, the parameter to be measured include temperature and/or pressure.
9. signal sampling method as claimed in claim 7 or 8, which is characterized in that the detection signal is voltage signal or electricity
Flow signal.
10. signal sampling method as claimed in claim 7, which is characterized in that the real signal value of the parameter to be measured meets
The following formula：
Vm=(OUTCODE/ACODE) * A,
Wherein, Vm is the real signal value of the parameter to be measured, and OUTCODE is the digital signal, and ACODE is full scale number
Signal value output, A are Full-span output value.
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