CN209236130U - Internal pressure monitor in high precision - Google Patents
Internal pressure monitor in high precision Download PDFInfo
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- CN209236130U CN209236130U CN201821616244.2U CN201821616244U CN209236130U CN 209236130 U CN209236130 U CN 209236130U CN 201821616244 U CN201821616244 U CN 201821616244U CN 209236130 U CN209236130 U CN 209236130U
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- pressure sensor
- preamplifier
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- precision
- digital converter
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- 238000012545 processing Methods 0.000 claims abstract description 26
- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
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- 230000009466 transformation Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 239000004065 semiconductor Substances 0.000 abstract description 5
- 230000005284 excitation Effects 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000007917 intracranial administration Methods 0.000 description 1
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Abstract
The utility model discloses the internal pressure monitors of high-precision, are related to medicine and hygiene fields；Including preposition amplification and processing unit, the preposition amplification and processing unit include pressure sensor, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；The pressure sensor is piezoresistive bridge sensor, and the signal output end of pressure sensor is connected to the signal input part of the preamplifier；The signal output end of the preamplifier is connected to the signal input part of the analog-digital converter；The reference resistance RfIt connects with the pressure sensor, reference resistance RfPartial pressure for reference voltage as analog-digital converter；The DC voltage power supply gives pressure sensor and the reference resistance R simultaneouslyfSeries circuit and preamplifier power supply；Various errors and temperature drift can be eliminated under conditions of using conventional excitation power supply and semiconductor material pressure sensor using the technical solution of the utility model, realize high-acruracy survey.
Description
" technical field "
The utility model relates to medicine and hygiene fields, more particularly to a kind of internal pressure monitor of high-precision.
" background technique "
The intracorporal blood of life, tissue and body fluid etc. have certain pressure, such as blood pressure, intracranial pressure, intraspinal tube pressure, wing
Guang pressure, uterine pressure etc..Internal pressure monitoring is divided into noninvasive and invasive two ways.Invasive mode also known as directly measures
Method is to obtain pressure signal using pressure sensor by establishing direct channel with measuring point.Invasive mode is more quasi- because of it
Really reliably clinically generally regarded as being goldstandard.
Sensor used in the direct method of measurement can be divided into fibre optical sensor and piezoresistive bridge sensor.Fibre optical sensor,
Although measurement is accurate, it manufactures complexity, expensive, inconvenient for use, and drainage cannot be taken into account while monitoring pressure, is filled
The treatment function such as note.Piezoresistive bridge sensor is clinically mainly used at present, and because spatial volume and cost are limited, pressure drag bridge
The material of formula sensor is nearly all semiconductor material.
The piezoresistive bridge sensor of semiconductor material have maximum a problem be exactly have because of variation of ambient temperature it is very bright
Aobvious temperature drift.In addition, constituting other electronic components of entire circuit, there is also have temperature drift because of variation of ambient temperature.
It is explained as follows.
It is U in driving voltage, resistance-strain amount caused by pressure is Δ R, and arm resistance is for piezoresistive bridge sensor
Under conditions of R, according to pressure drag electric bridge formula, output signal voltage VoutFor
As it can be seen that make output signal voltage VoutIt is linearly proportional with resistance-strain amount Δ R, then require excitation electricity
It presses U and arm resistance R all invariable or both of which ratios constant is constant.
It, the regulated power supply configured with high-precision and low excursion with temperature if wanting driving voltage invariable.It is such
Regulated power supply design is more complex, and cost is not also low, and precision is also not easy to be made too high.
If wanting arm resistance invariable, it is required that the arm resistance of pressure sensor is high-precision and high stability
, this is just more difficult.Changes will occur for each arm resistance of the piezoresistive bridge sensor of semiconductor material, each bridge arm electricity
Resistance with variation degree it is all inconsistent, eventually led to obviously temperature drift.
If wanting the ratios constant of driving voltage and arm resistance constant, constant-current source circuit can be used.But constant-current source is electric
Road must also have regulated power supply as benchmark.The design of the regulated power supply of high-precision and low excursion with temperature is more complex, and cost is not also low,
And precision is also not easy to be made too high.
" utility model content "
Based on the shortcomings of the prior art, the purpose of this utility model is to provide a kind of internal pressure monitorings of high-precision
Instrument, the monitor is under conditions of using conventional excitation power supply and conventional semiconductor material pressure sensor, it will be able to real
Existing high-acruracy survey.
To achieve the above object, the utility model adopts the following technical solutions:
Internal pressure monitor in high precision, it is characterised in that including preposition amplification and processing unit, it is described it is preposition amplification and
Processing unit includes pressure sensor, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；
The pressure sensor is piezoresistive bridge sensor, and the signal output end of the piezoresistive bridge sensor is connected to institute
The signal input part of preamplifier is stated, the pressure sensor is used to the pressure signal monitored being converted to electric signal, institute
The signal output end for stating preamplifier is connected to the signal input part of the analog-digital converter, and the preamplifier is used for will
The electric signal amplification of pressure sensor output；
The reference resistance RfIt connects with the pressure sensor, the reference resistance RfPartial pressure be used for as modulus turn
The reference voltage of parallel operation is connected with two reference voltage input terminals of the analog-digital converter；
The DC voltage power supply connect the pressure sensor and the reference resistance Rf series loop both ends and
The power input of preamplifier, the DC voltage power supply give the pressure sensor and the reference resistance R simultaneouslyf's
Series circuit and preamplifier power supply.
Further, the reference resistance RfThe voltage at both ends is connected to the modulus after zooming in or out and turns
Two reference voltage input terminals of parallel operation.
Further, the reference resistance RfIt is connected on the negative incentive end of the pressure sensor, the reference resistance Rf
One end ground connection, other end connect the negative incentive end of pressure sensor.
Further, the preamplifier further includes a proportion divider circuit, and the proportion divider circuit is through impedance
The common-mode voltage of common-mode voltage after transformation driving as the preamplifier, preamplifier is equal or close to the pressure
The common-mode voltage of force snesor.
Further, the reference resistance RfImpedance value be less than or equal to the pressure sensor equivalent impedance 5%.
Further, the pressure sensor is piezoresistive bridge sensor one build-out resistor of series connection.
It further, further include central processing unit, key operation unit, input/output interface and display unit；It is described
Central processing unit has multiple output ends, input terminal and output input；The output end and key of the analog-digital converter
Operating unit connects an input terminal for being connected respectively to the central processing unit, and the display unit is connected to the centre
Manage an output end of device；The input and output interfaces are connected to an output input of the central processing unit.
Further, the preamplifier and analog-digital converter are integrated chip.
Further, the central processing unit be one be integrated with the preamplifier, the analog-digital converter and
The special chip of the DC voltage power supply.
Further, the special chip is mixed-signal processor.
Further, the DC voltage power supply is integrated into the central processing unit or the preamplifier or institute
It states in analog-digital converter.
The utility model has the beneficial effects that giving pressure sensor and preamplifier simultaneously using the same voltage source
Power supply, can eliminate deviation caused by mains fluctuations；Avoid voltage regulation factor bring large error.By preposition
Set scale bleeder circuit makes the common-mode voltage of preamplifier close to the common-mode voltage of pressure sensor inside amplifier, eliminates
Offset errors caused by sensor common-mode voltage；By by reference resistance RfPartial pressure as analog-digital converter reference electricity
Pressure, avoid arm resistance variation and caused by sensitivity variations and mains voltage variations and caused by sensitivity variations.Ginseng
Examine resistance RfLesser value is taken, ensures that the interchangeability for pressure sensor in this way.Body pressure provided by the utility model
Monitor can be realized as high-acruracy survey using conventional electronic component.
" Detailed description of the invention "
Fig. 1 is the overall structure block diagram of high-precision pressure monitor provided by the embodiment of the utility model.
Fig. 2 is the structural block diagram of preposition amplification and processing unit provided by the embodiment of the utility model.
Fig. 3 is the circuit diagram of preposition amplification and processing unit provided by the embodiment of the utility model.
" specific embodiment "
In order to which the technical solution of the utility model is more clearly understood, below in conjunction with attached drawing and specific embodiment to this reality
It is described further with novel:
As shown in Fig. 1~2, a kind of internal pressure monitor of high-precision, including preposition amplification and processing unit, central processing
Device, key operation unit, input/output interface and display unit；The preposition amplification and processing unit include pressure sensing
Device, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；
The central processing unit has multiple output ends, input terminal and output input；The analog-digital converter it is defeated
Outlet and key operation unit connection are connected respectively to an input terminal of the central processing unit, the display unit connection
To an output end of the central processing unit；The output that the input and output interfaces are connected to the central processing unit is defeated
Enter end.
The pressure sensor is piezoresistive bridge sensor one build-out resistor of series connection；The piezoresistive bridge sensor it is defeated
Outlet is connected to the signal input part of the preamplifier, and the pressure sensor is used to convert the pressure signal monitored
For electric signal；The signal output end of the preamplifier is connected to the signal input part of the analog-digital converter, described preposition
The electric signal that amplifier is used to export pressure sensor amplifies；
The reference resistance RfIt is connected on the negative incentive end of the pressure sensor, reference resistance RfOne end ground connection, in addition
The negative incentive end of one end connection pressure sensor；The reference resistance RfPartial pressure can through zooming in or out or directly
For the reference voltage as analog-digital converter, it is connected with two input terminals of the reference voltage of the analog-digital converter；With reference to
Resistance RfValue will be much smaller than pressure sensor equivalent input impedance, generally preferably below 5%.Under these conditions, when
When replacement uses the pressure sensor of another input impedance, overall sensitivity is considered as remaining unchanged.It ensures that in this way
For the interchangeability of pressure sensor.
The DC voltage power supply connects the pressure sensor and the reference resistance RfSeries loop both ends and
The power input of preamplifier, the DC voltage power supply give the pressure sensor and the reference resistance R simultaneouslyf's
Series circuit and preamplifier power supply.
Because being powered using the same voltage source while to pressure sensor and preamplifier, power supply can be eliminated
Deviation caused by voltage fluctuation.There is no voltage regulation factor bring large errors.
As shown in figure 3, the central processing unit used in the present embodiment is actually to be integrated with preamplifier, analog-to-digital conversion
The special chip ASIC of device and DC voltage power supply etc..Pressure sensor is piezoresistive bridge sensor one build-out resistor of series connection.
The positive analog input pin AINP of the positive output end connection ASIC of piezoresistive bridge sensor, negative output terminal connect ASIC
Negative sense analog input pin AINN.Reference resistance RfIt is connected on the negative incentive end of piezoresistive bridge sensor, reference resistance RfOne end
Ground connection, other end connect the negative incentive end of piezoresistive bridge sensor.
It is in the same direction to defeated with operational amplifier A1 after positive one electromagnetic interface filter of analog input pin AINP connection of ASIC
Enter end connection, A1 is used to amplify the positive output end of piezoresistive bridge sensor；The negative sense analog input pin AINN of ASIC connection one
It is connect after electromagnetic interface filter with the noninverting input of operational amplifier A2, A2 is used to amplify the negative output of piezoresistive bridge sensor
End；The positive output signal and negative output signal of enlarged piezoresistive bridge sensor are connected respectively to the in the same direction of operational amplifier A3
Input terminal and negative input carry out second and amplify, and second of amplified signal is output to the signal input of analog-digital converter
End, signal and reference resistance R in analog-digital converter by amplifying secondfVoltage-contrast after output digit signals.
When supply voltage becomes smaller, the output signal of piezoresistive bridge sensor just becomes smaller；And simultaneously, because supply voltage becomes
It is small to cause to flow through reference resistance RfElectric current can become smaller, so reference resistance RfOn voltage also become smaller.Final ADC exports knot
Fruit is constant.Vice versa.In this way eliminate mains voltage variations and caused by sensitivity variations.
When temperature change makes the arm resistance of electric bridge become larger, according to pressure drag electric bridge formula, output signal just becomes smaller；And
Meanwhile because arm resistance, which becomes larger, leads to flow through reference resistance RfElectric current can become smaller, so reference resistance RfOn voltage also become
It is small.Final ADC output result is constant.Vice versa.In this way eliminate arm resistance variation and caused by sensitivity variations.
Other parts in ASIC are unrelated with this patent, are not described.It can be realized by routine techniques.
The embedded software for needing to run in ASIC is unrelated with this patent, is not described.It can be realized by routine techniques.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
Be confined to this, those of ordinary skill in the art within the technical scope disclosed by the utility model, according to the technical side of utility model
Case and design are subject to equivalent substitution or change, should all cover within the protection scope of the present utility model.
Claims (11)
1. the internal pressure monitor of high-precision, which is characterized in that including preposition amplification and processing unit, the preposition amplification and place
Managing unit includes pressure sensor, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；
The pressure sensor is piezoresistive bridge sensor；The signal output end of the piezoresistive bridge sensor be connected to it is described before
Set the signal input part of amplifier；
The signal output end of the preamplifier is connected to the signal input part of the analog-digital converter；
The reference resistance RfIt connects with the pressure sensor, the reference resistance RfPartial pressure be used for be used as analog-digital converter
Reference voltage, be connected with the reference voltage input terminal of the analog-digital converter；
The DC voltage power supply connects the pressure sensor and the reference resistance RfSeries loop both ends and preceding storing
The power input of big device, the DC voltage power supply give the pressure sensor and the reference resistance R simultaneouslyfSeries electrical
Road and preamplifier power supply.
2. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the reference resistance RfThe electricity at both ends
Pressure, is connected to two reference voltage input terminals of the analog-digital converter after zooming in or out.
3. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the reference resistance RfIt is connected on institute
State the negative incentive end of pressure sensor, the reference resistance RfOne end ground connection, other end connect the negative sense of pressure sensor
Motivate end.
4. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the preamplifier further includes one
A proportion divider circuit, common-mode voltage of the proportion divider circuit after impedance transformation driving as the preamplifier,
The common-mode voltage of preamplifier is equal or close to the common-mode voltage of the pressure sensor.
5. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the reference resistance RfImpedance value
Less than or equal to the 1% of the equivalent impedance of the pressure sensor.
6. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the pressure sensor is pressure drag bridge
One build-out resistor of formula sensor series.
7. the internal pressure monitor of high-precision as described in claim 1~6 any one, it is characterised in that: further include center
Processor, key operation unit, input/output interface and display unit；The central processing unit has multiple output ends, defeated
Enter end and output input；Output end and the key operation unit connection of the analog-digital converter are connected respectively in described
One input terminal of central processor, the display unit are connected to an output end of the central processing unit；The output is defeated
Incoming interface is connected to an output input of the central processing unit.
8. the internal pressure monitor of high-precision as described in claim 1~6 any one, it is characterised in that: put before described
Big device and analog-digital converter are integrated chip.
9. the internal pressure monitor of high-precision as claimed in claim 7, it is characterised in that: the central processing unit is a collection
At the special chip of the preamplifier, the analog-digital converter and the DC voltage power supply.
10. the internal pressure monitor of high-precision as claimed in claim 9, it is characterised in that: the special chip is mixing letter
Number processor.
11. the internal pressure monitor of high-precision as claimed in claim 7, it is characterised in that: the DC voltage power supply is integrated
Into the central processing unit or the preamplifier or the analog-digital converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821616244.2U CN209236130U (en) | 2018-09-30 | 2018-09-30 | Internal pressure monitor in high precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821616244.2U CN209236130U (en) | 2018-09-30 | 2018-09-30 | Internal pressure monitor in high precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209236130U true CN209236130U (en) | 2019-08-13 |
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ID=67518838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821616244.2U Active CN209236130U (en) | 2018-09-30 | 2018-09-30 | Internal pressure monitor in high precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209236130U (en) |
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2018
- 2018-09-30 CN CN201821616244.2U patent/CN209236130U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ROYAL FORNIA MEDICAL EQUIPMENT Co.,Ltd. Assignor: ZHUHAI YATELAN LIFE ENGINEERING TECHNOLOGY Co.,Ltd. Contract record no.: X2024980003289 Denomination of utility model: High precision internal pressure monitoring instrument Granted publication date: 20190813 License type: Common License Record date: 20240322 |
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| EE01 | Entry into force of recordation of patent licensing contract |