CN206469938U - Liquid level detection circuit and liquid level detection device - Google Patents
Liquid level detection circuit and liquid level detection device Download PDFInfo
- Publication number
- CN206469938U CN206469938U CN201720046106.4U CN201720046106U CN206469938U CN 206469938 U CN206469938 U CN 206469938U CN 201720046106 U CN201720046106 U CN 201720046106U CN 206469938 U CN206469938 U CN 206469938U
- Authority
- CN
- China
- Prior art keywords
- liquid level
- electrode
- phase inverter
- level detection
- detection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model discloses a kind of liquid level detection circuit and liquid level detection device, wherein, the liquid level detection circuit includes first electrode, second electrode, the first phase inverter and controller；Wherein, first electrode and second electrode, are arranged in the container containing medium；Medium between first electrode, second electrode and two electrode is collectively forming a testing capacitance；First phase inverter, control testing capacitance alternately charges, discharged, output electric pulse signal；Controller, measures the frequency of electric impulse signal, according to the liquid level value in the frequency acquisition container of electric impulse signal.Technical solutions of the utility model make it that the level sensing of IVD medical detecting Instruments is more accurate, and suitable for automatic test.
Description
Technical field
The utility model is related to IVD medical detecting Instrument technical fields, more particularly to a kind of liquid level detection circuit and application
The liquid level detection device of the liquid level detection circuit.
Background technology
In IVD (in vitro diagnostic, in-vitro diagnosis) medical detecting Instrument, it is often necessary to in container
The liquid level of liquid is detected.Currently used liquid-level detecting method is divided into：Surveyed according to the connective principle of fluid
Measure the direct-reading detection of liquid level；The principle changed according to float height with height of liquid level detects to measure the floatage-type of liquid level；
When passing through material according to the nuclear radiation of isotope ray, the principle that intensity changes with the thickness change of material layer measures liquid level
Nuclear radiation formula；Cause acoustic impedance and reflective distance to change to measure the acoustics formula of liquid level according to the change of thing position.But due to current
IVD medical detecting Instruments use fully automatic working pattern substantially, and direct-reading is not suitable for the mode of operation of automation with floatage-type,
The built-up circuit of nuclear radiation formula and acoustics formula is complex, and measured parameter is not accurate enough.
Utility model content
Main purpose of the present utility model is to provide a kind of liquid level detection circuit, it is desirable to provide a kind of accurate, and is applied to
The liquid level detection circuit of automatic test.
To achieve the above object, the utility model proposes liquid level detection circuit, including first electrode, second electrode,
One phase inverter and controller；Wherein,
The first electrode and the second electrode, are arranged in the container containing medium；The first electrode, second electrode
Medium between two electrode is collectively forming a testing capacitance；
First phase inverter, controls the testing capacitance alternately to charge, discharge, output electric pulse signal；
The controller, measures the frequency of the electric impulse signal, according to the frequency acquisition container of the electric impulse signal
Interior liquid level value.
Preferably, the first electrode ground connection, the second electrode is connected with the input of first phase inverter, described
The output end of first phase inverter is connected with the input of the controller, and the output end of first phase inverter is also with described second
Electrode is connected.
Preferably, the liquid level detection circuit also include the second phase inverter, the input of second phase inverter with it is described
The output end connection of first phase inverter, the output end of second phase inverter is connected with the input of the controller；Described
High level in two phase inverters, the electric impulse signal that first phase inverter is exported is converted to low level, anti-by described first
Low transition in the electric impulse signal of phase device output is high level.
Preferably, the liquid level detection circuit also include serial counter, the input of the serial counter with it is described
The output end connection of second phase inverter, the output end of the serial counter is connected with the input of the controller；The string
Linage-counter, is divided to the electric impulse signal that second phase inverter is exported, to reduce the frequency of the electric impulse signal.
Preferably, the serial counter is realized by carry binary counter.
Preferably, the liquid level detection circuit also includes divider resistance, the first end of the divider resistance and described first
The output end connection of phase inverter, the second end of the divider resistance is connected with the second electrode.
Preferably, the liquid level detection circuit also includes filter capacitor, the first end of the filter capacitor and described second
Electrode is connected, the second end ground connection of the filter capacitor；The signal that the filter capacitor is exported to the testing capacitance is filtered
Ripple.
Preferably, the controller includes single-chip microcomputer, the output of the input of the single-chip microcomputer and the serial counter
End connection；The single-chip microcomputer, measures the frequency of the electric impulse signal of the serial counter input, according to the electric impulse signal
Frequency matches liquid level corresponding with frequency with the tables of data prestored.
Preferably, the controller includes single-chip microcomputer, the output of the input of the single-chip microcomputer and the serial counter
End connection；The single-chip microcomputer, measures the frequency of the electric impulse signal of the serial counter input, according to the electric impulse signal
Frequency calculates the dielectric constant of testing capacitance, and liquid level is calculated by the dielectric constant.
The utility model also proposes a kind of liquid level detection device, including first electrode, second electrode, the first phase inverter and control
Device processed；Wherein, the first electrode and the second electrode, are arranged in the container containing medium；The first electrode, the second electricity
Medium between pole and two electrode is collectively forming a testing capacitance；First phase inverter, controls the testing capacitance alternating
Charging, electric discharge, output electric pulse signal；The controller, measures the frequency of the electric impulse signal, according to the electric pulse
Liquid level value in the frequency acquisition container of signal.
Technical solutions of the utility model are realized by using first electrode, second electrode, the first reverser and controller
A kind of liquid level detection circuit.One dielectric is formd by the liquid and air between first electrode, second electrode and two electrodes
The testing capacitance that constant changes and changed with liquid level, by the first phase inverter so that testing capacitance alternately charges, put
Electricity, and then an electric impulse signal is obtained, the frequency of the electric impulse signal is detected by controller, according to the frequency of electric impulse signal
Obtain the liquid level value in container.The utility model make it that the level sensing in IVD medical detecting Instruments is more accurate, and full
The requirement of sufficient automatic test.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the circuit diagram of the embodiment of the utility model liquid level detection circuit one.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 100 | Testing capacitance | 110 | First electrode |
| 200 | First phase inverter | 120 | Second electrode |
| 300 | Second phase inverter | C | Filter capacitor |
| 400 | Controller | R | Divider resistance |
| 500 | Serial counter |
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of the utility model protection.
It is to be appreciated that institute is directional in the utility model embodiment indicates (such as up, down, left, right, before and after ...)
Relative position relation, motion conditions for being only used for explaining under a certain particular pose (as shown in drawings) between each part etc., such as
When really the particular pose changes, then directionality indicates also correspondingly therewith to change.
In addition, the description for being related to " first ", " second " etc. in the utility model is only used for describing purpose, without being understood that
To indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ",
At least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the technical side between each embodiment
Case can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical scheme
It will be understood that the combination of this technical scheme is not present when appearance is conflicting or can not realize, also not in the utility model requirement
Protection domain within.
The utility model proposes a kind of liquid level detection circuit.
Reference picture 1, the liquid level detection circuit includes first electrode 110, second electrode 120, the first phase inverter 200 and control
Device 400；Wherein, the first electrode 110 and the second electrode 120, are arranged in the container containing medium；The first electrode
110th, the medium between second electrode 120 and two electrode is collectively forming a testing capacitance 100；First phase inverter 200, control
Make the testing capacitance 100 alternately charging, electric discharge, output electric pulse signal；The controller 400, measures the electric pulse
The frequency of signal, according to the liquid level value in the frequency acquisition container of the electric impulse signal.
It should be noted that the medium between the first electrode 110 and the second electrode 120 includes liquid and liquid level
The mixture of the gaseous state water and air of top, because the dielectric that the dielectric constant of liquid is more than vaporous water and air mixture is normal
Number, when the liquid level change of liquid, the dielectric constant between first electrode 110 and second electrode 120 changes, and causes
The capacitance size of the testing capacitance 100 changes, and the charging interval of testing capacitance 100 and discharge time change, caused defeated
Go out electric impulse signal frequency to change.The frequency for detecting the electric impulse signal by the controller 400 can be inquired about or counted
Calculate the liquid level of liquid.
The haemolysis pond of glycolated hemoglobin analysis is detected in the utility model embodiment by the liquid level detection circuit
Liquid level.During measurement, haemolysis pond top is vaporous water and air mixture, and bottom is hydraulically full, and wherein gaseous state water and air is mixed
The dielectric constant of thing is ε 0, the permittivity ε 1 of liquid, ε 1>ε0.
It can obtain capacitance variations value Δ C calculated value：Δ C=X (ε 1- ε 0) C/H；
X represents the actual height of liquid, and C represents initial capacitance value, and H represents the height in haemolysis pond；
Therefore the calculated value of time constant Δ T conversion：Δ T=R Δs C
Because Δ T change so that the electrical impulse frequency of generation is different.Master control only needs to detect that the frequency of electric pulse can
To know the height of liquid level in current haemolysis pond.
Technical solutions of the utility model are by using first electrode 110, second electrode 120, the first reverser 200 and control
Device 400, realizes a kind of liquid level detection circuit.By the liquid between first electrode 110, the electrode of second electrode 120 and two and
Air forms the testing capacitance 100 that a dielectric constant changes and changed with liquid level, by the first phase inverter 200, makes
Testing capacitance 100 alternately charging, electric discharge are obtained, and then obtains an electric impulse signal, the electric pulse is believed by the detection of controller 400
Number frequency, obtain the dielectric constant of the testing capacitance 100 by the frequency of electric impulse signal, and then obtain the height value of liquid level.
The utility model make it that the level sensing in IVD medical detecting Instruments is more accurate, and meets the requirement of automatic test.
Specifically, the first electrode 110 is grounded, the second electrode 120 and the input of first phase inverter 200
Connection, the output end of first phase inverter 200 is connected with the input of the controller 400, first phase inverter 200
Output end is also connected with the second electrode 120.
Further, the reverser in the utility model can be realized by NAND gate nor gate.
Specifically, the liquid level detection circuit also includes the second phase inverter 300, the input of second phase inverter 300
It is connected with the output end of first phase inverter 200, the output end of second phase inverter 300 is defeated with the controller 400
Enter end connection；High level conversion in second phase inverter 300, the electric impulse signal that first phase inverter 200 is exported
For low level, the low transition in the electric impulse signal that first phase inverter 200 is exported is high level.
It should be noted that the phase for the electric impulse signal for being exported the first phase inverter 200 by the second phase inverter 300 is entered
Row changes.
Specifically, the liquid level detection circuit also includes serial counter 500, the input of the serial counter 500
It is connected with the output end of second phase inverter 300, the output end of the serial counter 500 is defeated with the controller 400
Enter end connection；The serial counter 500, is divided to the electric impulse signal that second phase inverter 300 is exported, to reduce
The frequency of the electric impulse signal.
It should be noted that because the container volume of IVD Medical Instruments is smaller, the capacitance of the testing capacitance 100 becomes
Change soon, the frequency of the impulse wave of generation is higher.Therefore add one-level serial counter 500 and divided, convert thereof into frequency
Relatively low square pulse ripple, in order to the measurement of controller 400, lifts the accuracy of frequency detecting.
Specifically, the serial counter 500 is realized by carry binary counter.
It should be noted that serial counter 500 of the present utility model is entered by type for CD4020B CMOS ripples carry two
Counter processed is realized.First phase inverter 200 and second phase inverter 300 by model CD4093 NAND gate come
Realize.
Specifically, the liquid level detection circuit also includes divider resistance R, the first end of the divider resistance R and described the
The output end connection of one phase inverter 200, the second end of the divider resistance R is connected with the second electrode 120.
Specifically, the liquid level detection circuit also includes filter capacitor C, the first end of the filter capacitor C and described the
Two electrodes 120 are connected, the second end ground connection of the filter capacitor C；The filter capacitor C is exported to the testing capacitance 100
Signal is filtered.
Specifically, the controller 400 includes single-chip microcomputer, the input of the single-chip microcomputer and the serial counter 500
Output end connection；The single-chip microcomputer, measures the frequency for the electric impulse signal that the serial counter 500 is inputted, according to the electricity
The frequency of pulse signal matches liquid level corresponding with frequency with the tables of data prestored.
Single-chip microcomputer in the utility model embodiment has prestored the tables of data that frequency and liquid level match.In use,
Single-chip microcomputer matches the corresponding liquid level of numerical value therewith by the pulse signal frequency detected.
Specifically, the controller 400 includes single-chip microcomputer, the input of the single-chip microcomputer and the serial counter 500
Output end connection；The single-chip microcomputer, measures the frequency for the electric impulse signal that the serial counter 500 is inputted, according to the electricity
The frequency of pulse signal calculates the dielectric constant of testing capacitance, and liquid level is calculated by the dielectric constant.
In the utility model embodiment, single-chip microcomputer calculates testing capacitance 100 by the pulse signal frequency detected
Dielectric constant, then calculate by the dielectric constant of testing capacitance 100 height of liquid level.
The technical solution of the utility model is by using first electrode 110, second electrode 120, the first reverser 200 and control
Device 400 processed, realizes a kind of liquid level detection circuit.The method detected by capacitance type liquid level is detected in IVD medical detecting Instruments
Liquid level.The circuit of technical solutions of the utility model is simple, measurement is accurate and is applied to automatic test.
The utility model also proposes a kind of liquid level detection device, and the liquid level detection device includes level sensing as described above
Circuit, the concrete structure of the liquid level detection circuit is with reference to above-described embodiment, because liquid level detection device employs above-mentioned all realities
Whole technical schemes of example, therefore all beneficial effects that at least technical scheme with above-described embodiment is brought are applied, herein
No longer repeat one by one.
Preferred embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited,
It is every under inventive concept of the present utility model, the equivalent structure made using the utility model specification and accompanying drawing content is become
Change, or directly/be used in other related technical fields indirectly and be included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of liquid level detection circuit, applied to IVD medical detecting Instruments, it is characterised in that including first electrode, the second electricity
Pole, the first phase inverter and controller；Wherein,
The first electrode and the second electrode, are arranged in the container containing medium；The first electrode, second electrode are with being somebody's turn to do
Medium between two electrodes is collectively forming a testing capacitance；
First phase inverter, controls the testing capacitance alternately to charge, discharge, output electric pulse signal；
The controller, measures the frequency of the electric impulse signal, according in the frequency acquisition container of the electric impulse signal
Liquid level value.
2. liquid level detection circuit as claimed in claim 1, it is characterised in that the first electrode ground connection, the second electrode
It is connected with the input of first phase inverter, the output end of first phase inverter is connected with the input of the controller,
The output end of first phase inverter is also connected with the second electrode.
3. liquid level detection circuit as claimed in claim 2, it is characterised in that also including the second phase inverter, described second is anti-phase
The input of device is connected with the output end of first phase inverter, and the output end of second phase inverter is defeated with the controller
Enter end connection；High level in second phase inverter, the electric impulse signal that first phase inverter is exported is converted to low electricity
Flat, the low transition in the electric impulse signal that first phase inverter is exported is high level.
4. liquid level detection circuit as claimed in claim 3, it is characterised in that also including serial counter, the serial counting
The input of device is connected with the output end of second phase inverter, and the output end of the serial counter is defeated with the controller
Enter end connection；The serial counter, divides to the electric impulse signal that second phase inverter is exported, reduces the electric pulse
The frequency of signal.
5. liquid level detection circuit as claimed in claim 4, it is characterised in that the serial counter passes through carry binary system meter
Device is counted to realize.
6. the liquid level detection circuit as described in any one of claim 1 to 5, it is characterised in that also including divider resistance, described point
The first end of piezoresistance is connected with the output end of first phase inverter, the second end and the second electrode of the divider resistance
Connection.
7. liquid level detection circuit as claimed in claim 6, it is characterised in that also including filter capacitor, the filter capacitor
First end is connected with the second electrode, the second end ground connection of the filter capacitor；The filter capacitor is to the testing capacitance
The signal of output is filtered.
8. liquid level detection circuit as claimed in claim 4, it is characterised in that the controller includes single-chip microcomputer, the monolithic
The input of machine is connected with the output end of the serial counter；The single-chip microcomputer, measures the electricity of the serial counter input
The frequency of pulse signal, liquid level corresponding with frequency is matched according to the frequency of the electric impulse signal with the tables of data prestored.
9. liquid level detection circuit as claimed in claim 4, it is characterised in that the controller includes single-chip microcomputer, the monolithic
The input of machine is connected with the output end of the serial counter；The single-chip microcomputer, measures the electricity of the serial counter input
The frequency of pulse signal, the dielectric constant of testing capacitance is calculated according to the frequency of the electric impulse signal, passes through the dielectric constant
Calculate liquid level.
10. a kind of liquid level detection device, it is characterised in that including the level sensing electricity as described in claim 1 to 9 any one
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720046106.4U CN206469938U (en) | 2017-01-13 | 2017-01-13 | Liquid level detection circuit and liquid level detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720046106.4U CN206469938U (en) | 2017-01-13 | 2017-01-13 | Liquid level detection circuit and liquid level detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206469938U true CN206469938U (en) | 2017-09-05 |
Family
ID=59705270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720046106.4U Active CN206469938U (en) | 2017-01-13 | 2017-01-13 | Liquid level detection circuit and liquid level detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206469938U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072422A (en) * | 2017-12-30 | 2018-05-25 | 杭州元睿电子有限公司 | A kind of net taste machine of liquid level detection device and the application device |
| CN108205335A (en) * | 2017-12-20 | 2018-06-26 | 厦门市逢兴机电设备有限公司 | Water level automatic control device |
| CN110879092A (en) * | 2019-11-29 | 2020-03-13 | 安徽江淮汽车集团股份有限公司 | Liquid level monitoring circuit |
| CN112857519A (en) * | 2019-11-12 | 2021-05-28 | 骊住(中国)投资有限公司 | Liquid level detection device, sanitary equipment and water dispenser |
| CN112945349A (en) * | 2021-02-03 | 2021-06-11 | 浙江厚德气动元件有限公司 | Pneumatic triple piece of automatic drainage of real-time supervision water level |
-
2017
- 2017-01-13 CN CN201720046106.4U patent/CN206469938U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205335A (en) * | 2017-12-20 | 2018-06-26 | 厦门市逢兴机电设备有限公司 | Water level automatic control device |
| CN108072422A (en) * | 2017-12-30 | 2018-05-25 | 杭州元睿电子有限公司 | A kind of net taste machine of liquid level detection device and the application device |
| CN112857519A (en) * | 2019-11-12 | 2021-05-28 | 骊住(中国)投资有限公司 | Liquid level detection device, sanitary equipment and water dispenser |
| CN110879092A (en) * | 2019-11-29 | 2020-03-13 | 安徽江淮汽车集团股份有限公司 | Liquid level monitoring circuit |
| CN110879092B (en) * | 2019-11-29 | 2020-12-01 | 安徽江淮汽车集团股份有限公司 | Liquid level monitoring circuit |
| CN112945349A (en) * | 2021-02-03 | 2021-06-11 | 浙江厚德气动元件有限公司 | Pneumatic triple piece of automatic drainage of real-time supervision water level |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206469938U (en) | Liquid level detection circuit and liquid level detection device | |
| CN105387909B (en) | Voltage output mode fuel-quantity transducer | |
| CN203396450U (en) | Novel capacitive sensor | |
| CN103900661B (en) | Segmented liquid level sensor based on capacitance-to-digital conversion technology | |
| CN103675463A (en) | Liquid dielectric constant measuring system self-adapting to scale and precision | |
| CN204758082U (en) | Intelligent drinking cup of non -contact level sensor and applied this sensor | |
| CN102288259A (en) | Segmentation capacitance type liquid level sensor and liquid level measurement method thereof | |
| CN105806444A (en) | Non-contact liquid level sensor and liquid level detection method | |
| CN104897239A (en) | Non-contact liquid level sensor and intelligent water cup comprising the same | |
| CN107782408A (en) | Liquid level detection circuit, liquid-level detecting method and wall-breaking machine | |
| CN108614220B (en) | A kind of accumulator internal resistance measurement method based on damped oscillation | |
| CN109238401A (en) | Liquid level detection device and method | |
| CN202039844U (en) | Device for automatic and continuous monitoring and metering of oil well water content | |
| CN206891534U (en) | A kind of water-level gauge monitoring system with sludge interface detecting function | |
| CN108363089A (en) | The quick valued methods of precipitation rate of radon and device | |
| CN201438127U (en) | Precise liquid level sensor | |
| CN202083436U (en) | Sectional capacitor type liquid level sensor | |
| CN203298828U (en) | Device for measuring liquid level and boundary level of tank body | |
| CN105698663A (en) | Single-end network cable length measurement device and method | |
| CN201255648Y (en) | Liquid level detecting device | |
| CN102997977A (en) | Vehicle charged oil capacity and oil product grade detection device | |
| CN206440659U (en) | A kind of CPLD humidity measuring circuits | |
| CN112161673B (en) | Accurate capacitive liquid level detection circuit and adjustment mode | |
| CN205860976U (en) | A kind of device of single-ended measurement length of mesh wire | |
| CN102353686B (en) | On-line monitoring device of water content in solid material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |