CN107782408A - Liquid level detection circuit, liquid-level detecting method and wall-breaking machine - Google Patents
Liquid level detection circuit, liquid-level detecting method and wall-breaking machine Download PDFInfo
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- CN107782408A CN107782408A CN201610755771.0A CN201610755771A CN107782408A CN 107782408 A CN107782408 A CN 107782408A CN 201610755771 A CN201610755771 A CN 201610755771A CN 107782408 A CN107782408 A CN 107782408A
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- 239000007788 liquid Substances 0.000 title claims abstract description 136
- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000006698 induction Effects 0.000 claims abstract description 74
- 239000003990 capacitor Substances 0.000 claims abstract description 61
- 238000007599 discharging Methods 0.000 claims abstract description 41
- 230000005611 electricity Effects 0.000 claims description 18
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000004146 energy storage Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 235000021251 pulses Nutrition 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The present invention discloses a kind of liquid level detection circuit, liquid-level detecting method and wall-breaking machine, and liquid level detection circuit includes induction electrode, capacitor storage unit and charge-discharge circuit, and induction electrode is used to sense liquid level to be measured；Input, induction electrode and an alternating source for charge-discharge circuit is interconnected, and the output end of charge-discharge circuit is connected with capacitor storage unit；The charge-discharge circuit, for carrying out discharge and recharge to capacitor storage unit according to the power supply signal that alternating source exports；The signal processing circuit, the capacitance signal for detecting induction electrode generation causes the change of the charging/discharging voltage of capacitor storage unit, to identify liquid level.The liquid level detection circuit of the present invention uses an induction electrode, small volume, and need not directly be contacted with liquid, avoids after permanent use by liquid corrosion；Liquid level detection circuit reflects that liquid level changes by the cooperation of capacitor storage unit and charge-discharge circuit, and circuit structure is simple, and cost is cheap, and stability is high.
Description
Technical field
The present invention relates to Technology of Level Detection field, more particularly to a kind of liquid level detection circuit, liquid-level detecting method and broken
Wall machine.
Background technology
Sectional capacitor type induction level detection with its without mechanical wear, long lifespan, water proof anti-soil, it is easy to clean the advantages of, should
Turn into new attraction in the food processors such as wall-breaking machine, electric cooker, soy bean milk making machine, insulating pot and coffee pot.It is existing
Capacitance type liquid level detection circuit is by the way that electrode is built in liquid, then by measuring capacitance between two electrodes of electric capacity
Variable quantity, realize level sensing.But in some closed container, pipeline or vessel, another induction electrode is installed
Extremely difficult or long-time puts induction electrode in the solution, so as to cause induced electricity easily to corrode.
The content of the invention
The main object of the present invention is to propose a kind of liquid level detection circuit, it is desirable to provide one kind realizes that capacitive sensing measures liquid
The circuit of position, while the circuit structure is simple, cost is low.
To achieve the above object, a kind of liquid level detection circuit proposed by the present invention, including：
Induction electrode, for sensing liquid level to be measured；
Capacitor storage unit；
Charge-discharge circuit, the input of the charge-discharge circuit, the induction electrode and alternating source interconnection are described to fill
The output end of discharge circuit is connected with the capacitor storage unit；The charge-discharge circuit, for being exported according to the alternating source
Power supply signal to the capacitor storage unit carry out discharge and recharge；
Signal processing circuit, the input of the signal processing circuit signal connect with the output end of the charge-discharge circuit
Connect；The signal processing circuit, the capacitance signal for detecting the induction electrode generation cause filling for the capacitor storage unit
The change of discharge voltage, to identify liquid level.
Preferably, the charge-discharge circuit includes the first load, the second load, the first diode, the second diode；It is described
Capacitor storage unit includes the first electric capacity；
The first end of first load is the input of the charge-discharge circuit, the second end of first load and institute
State the first end connection of the second load；Second end of second load is connected with the first end of first electric capacity；Described
The second end ground connection of one electric capacity；
The negative electrode of first diode with described first load first end be connected, the anode of the first diode with it is described
The anode connection of second diode, the negative electrode of second diode are connected with the first end of the first electric capacity；
The output end of the charge-discharge circuit is the first end of first electric capacity.
Preferably, first load and the second load are resistance.
Preferably, the signal processing circuit includes：
Voltage acquisition module, for obtaining the current charging/discharging voltage of the capacitor storage unit；
Computing module, for the current charging/discharging voltage to be carried out into mathematic interpolation with default magnitude of voltage；
Liquid level identification module, for carrying out difference result identification with default magnitude of voltage according to the current charging/discharging voltage
Go out liquid level.
The present invention also proposes a kind of liquid-level detecting method, including：
S1, obtain the current charging/discharging voltage of capacitor storage unit；
S2, the current charging/discharging voltage and the first predeterminated voltage are subjected to mathematic interpolation；
S3, liquid level is identified according to the difference result of the current charging/discharging voltage and the first predeterminated voltage.
Preferably, perform the step S2 also includes afterwards：
S4, the difference result of the current charging/discharging voltage and the first predeterminated voltage is compared with the second predeterminated voltage
Compared with；
S5, when the difference result of the current charging/discharging voltage and the first predeterminated voltage is pre- less than or equal to described second
If during voltage, returning to circulation and performing the step S1-S2, until the difference of the current charging/discharging voltage and the first predeterminated voltage
As a result it is more than second predeterminated voltage, performs the step S3.
Preferably, the S5 includes：
S51, when the difference result of the current charging/discharging voltage and the first predeterminated voltage is less than or equal to described second
During predeterminated voltage, return to circulation and perform the step S1-S2；
S52, when the difference result of the current charging/discharging voltage and the first predeterminated voltage is more than second predeterminated voltage
When, 1 is added in current count frequency n；
S53 judges that the n reaches goal-selling number；
It is then to perform step S54；It is no, then return and perform the step S1；
S54, when the n reaches goal-selling number, then perform the step S3.
The present invention also proposes a kind of wall-breaking machine, and the wall-breaking machine includes cup and described liquid level detection circuit, the liquid
The induction electrode of position detection circuit is arranged on the cup.Wherein described liquid level detection circuit includes：
Induction electrode, for sensing liquid level to be measured；
Capacitor storage unit；
Charge-discharge circuit, the input of the charge-discharge circuit, the induction electrode and alternating source interconnection are described to fill
The output end of discharge circuit is connected with the capacitor storage unit；The charge-discharge circuit, for being exported according to the alternating source
Power supply signal to the capacitor storage unit carry out discharge and recharge；
Signal processing circuit, the input of the signal processing circuit signal connect with the output end of the charge-discharge circuit
Connect；The signal processing circuit, the capacitance signal for detecting the induction electrode generation cause filling for the capacitor storage unit
The change of discharge voltage, to identify liquid level.
Preferably, the induction electrode of the liquid level detection circuit is arranged on the outer surface of the cup.
Preferably, the liquid level detection circuit has multiple, and the induction electrode of multiple liquid level detection circuits is set respectively
The different height and position on the cup.
Technical solution of the present invention is very low in liquid level by setting charge-discharge circuit and capacitor storage unit, the induced electricity
When pole can not transmit energy to liquid, the alternating source is charged and put to capacitor cell by the charge-discharge circuit
Electricity；When liquid level reaches near induction electrode, the capacitor storage unit by the charge-discharge circuit by induction electrode to
Liquid is discharged, so as to cause the change of capacitor storage unit electricity, by detecting changing for the capacitor storage unit voltage
Become, so as to detect the change of container inside liquid level exactly.The liquid level detection circuit of the present invention uses an induction electrode, body
Product is smaller, and need not directly be contacted with liquid, avoids after permanent use by liquid corrosion；The liquid level detection circuit passes through
The cooperation reflection liquid level change of capacitor storage unit and charge-discharge circuit, circuit structure is simple, and cost is cheap, and stability is high.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the principle schematic that the induction electrode of liquid level detection circuit of the present invention discharges liquid；
Fig. 2 is the structural representation of liquid level detection circuit of the present invention；
Fig. 3 is the charging/discharging voltage versus time curve figure of the first electric capacity of the invention；
Fig. 4 is the present invention when induction electrode senses liquid, and the charging/discharging voltage of the first electric capacity changes with time song
Line chart；
Fig. 5 is the flow chart of the embodiment of liquid-level detecting method one of the present invention；
Fig. 6 is the flow chart of the another embodiment of liquid-level detecting method of the present invention；
Fig. 7 is the flow chart of liquid-level detecting method another embodiment of the present invention；
Fig. 8 is that liquid level of the present invention is the structural representation that induction electrode is arranged on wall-breaking machine cup outer surface；
Fig. 9 is the structural representation of level sensing module when setting multiple induction electrodes on wall-breaking machine cup of the present invention.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 1 | Level sensing module | D1 | First diode |
| 2 | Liquid level sample circuit | D2 | Second diode |
| 10 | Induction electrode | C1 | First electric capacity |
| 20 | Charge-discharge circuit | 40 | Signal processing circuit |
| 30 | Alternating source | 41 | Controller |
| R1 | First resistor | 50 | Non-metallic component |
| R2 | Second resistance | 51 | Cup |
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention proposes a kind of liquid level detection circuit, available for such as electric cooker, wall-breaking machine, soy bean milk making machine, insulating pot and
In the equipment such as coffee pot, default height whether has been met or exceeded for liquid in detection device.Fig. 1 and Fig. 2 are referred to, institute
Stating liquid level detection circuit includes induction electrode 10, capacitor storage unit, charge-discharge circuit 20 and signal processing circuit 40.Wherein
The induction electrode 10 is used to sense liquid level to be measured.The technical program belongs to measurement by capacitance liquid level, the induction electrode 10
The structure of similar parallel plate capacitor can be formed with liquid.Plane-parallel capacitor has two pole plates, therebetween across one layer of medium, electricity
Most of energy in container is directly gathered between two pole plates, and the change of one of plate charge quantity will cause in addition
The increase and decrease of plate charge, so as to be internally formed electric current in electric capacity.The induction electrode 10 is one of them of the capacitor
Electrode, and the part that the induction electrode 10 generally goes through a non-metallic material contacts with liquid, the part of the non-metallic material can
Think nonmetallic panel or cup 51 etc..Induction electrode 10 connects the input of alternating source 30 and charge-discharge circuit 20, thus
The induction electrode 10 has voltage, and when liquid level is near the induction electrode 10, the energy of electric field can pass through the non-gold
Belong to part 50, to liquid transmissive.Due to being filled with electrolyte in liquid tissue, when liquid level is close to induction electrode 10, induced electricity
The energy transmission liquid of pole 10, causes the loss of energy, as long as the power change so as to the sensed electrode 10 of detection stream, so that it may
To determine whether conductive materials close to the induction electrode 10.
In order to facilitate the change of electricity on detection induction electrode 10, the liquid level detection circuit includes the He of charge-discharge circuit 20
Capacitor storage unit.Input, the alternating source 30 of the induction electrode 10 and one of the charge-discharge circuit 20 interconnect, described to fill
The output end of discharge circuit 20 is connected with the capacitor storage unit；The charge-discharge circuit 20, for according to the alternating source
The power supply signal of 30 outputs carries out discharge and recharge to the capacitor storage unit.When induction electrode 10 and liquid do not form electric capacity,
When i.e. induction electrode 10 does not carry out energy transmission to liquid, the alternating source 30 constantly carries out charge and discharge to capacitor storage unit
Electricity.When water level corresponding to liquid rises to induction electrode 10, the induction electrode 10 forms electric capacity, now, electric capacity with liquid
Energy-storage units are discharged liquid by the induction electrode 10 so that before the electric charge of capacitor storage unit supplement is less than upper one electric discharge
Electric charge so that the capacitor storage unit electricity reduce, cause the decline of capacitor storage unit voltage.Therefore can be with
By detecting the change of the capacitor storage unit voltage, so as to determine whether conductive materials close to the induction electrode 10.
The capacitor storage unit voltage detected is analyzed and processed for convenience, the liquid level detection circuit also includes
Signal processing circuit 40.The input of the signal of signal processing circuit 40 is connected with the output end of the charge-discharge circuit 20；
The signal processing circuit 40, cause filling for the capacitor storage unit for detecting the capacitance signal that the induction electrode 10 generates
The change of discharge voltage, to identify liquid level, to carry out follow-up processing.
Technical solution of the present invention is very low in liquid level by setting charge-discharge circuit 20 and capacitor storage unit, the sensing
When electrode 10 can not transmit energy to liquid, the induction electrode 10 is carried out to capacitor cell jointly with the charge-discharge circuit 20
It is charged and discharged；When liquid level reaches near induction electrode 10, the capacitor storage unit is logical by the charge-discharge circuit 20
Cross induction electrode 10 to be discharged to liquid, so as to cause the change of capacitor storage unit electricity, stored up by detecting the electric capacity
The change of energy cell parameters, so as to detect the change of container inside liquid level exactly.The liquid level detection circuit of the present invention uses
One induction electrode 10, small volume, and need not directly being contacted with liquid, avoid after permanent use by liquid corrosion；Institute
To state liquid level detection circuit and reflect that liquid level changes by the cooperation of capacitor storage unit and charge-discharge circuit 20, circuit structure is simple,
Cost is cheap, and stability is high.
Based on above-described embodiment, the form of the charge-discharge circuit 20 have it is a variety of, can be only comprising load, wherein described
Load to consume the part of electric energy, such as resistance or lamp etc..In the present embodiment, referring to Fig. 2, the charge-discharge circuit 20 wraps
Include the first load, the second load, the first diode D1, the second diode D2；The capacitor storage unit includes the first electric capacity C1；
Described first first end loaded is the input of the charge-discharge circuit 20, the second end and described second of first load
The first end connection of load；Second end of second load is connected with the first end of the first electric capacity C1；First electricity
Hold C1 the second end ground connection.The negative electrode of the first diode D1 is connected with the first end of the described first load, the first diode
Anode be connected with the anode of the second diode D2, the negative electrode of the second diode D2 and the first electric capacity C1 first end
Connection；The output end of the charge-discharge circuit 20 is the first end of the first electric capacity C1.
In the charge-discharge circuit 20, the first diode D1 and the second diode D2 setting, can conveniently adjustment to the
The one electric capacity C1 charging and discharging time, so as to meet the needs of different product.The form of wherein alternating source 30 have it is a variety of, it is excellent
Elect rectangular pulse as.It is illustrated below by detecting the magnitude of voltage on the first electric capacity C1, determines whether liquid close to sensing
The course of work of electrode 10.It should be noted that in the present embodiment, first load is first resistor R1, described second
Load as second resistance R2；And the present embodiment is not done to the value of the load of alternating source 30, first, the second load and the first electric capacity C1
It is specific to limit, it can be set according to practical application request, example illustrative embodiments in the present embodiment are only to facilitate preferably manage
Solve the charge-discharge principle of this programme.
The frequency of alternating source 30 is set herein as 300kHz, and amplitude is 0~5V, dutycycle 50%, the one or two pole
Pipe D1, the second diode D2 forward conduction voltage are Vd, the first load and the second load resistance are 1M, the first electric capacity C1 values
For 0.1uF.When pulse signal saltus step is high level 5V, it is assumed that the starting voltage that charged on the first electric capacity C1 is U0, with charge and discharge
The progress of electric time, the first electric capacity C1 voltage is UC.Charge-discharge circuit 20 occurs such as according to voltage swing on the first electric capacity C1
Lower two kinds of situations：
(1) if (5U0)/2>Vd, charge constant τ=RC=106×0.1×10-6=0.1s, the first electric capacity C1's fills
Piezoelectric voltage is UC=U0e-t/τ+(5-Vd)×(1-e-t/τ)。
(2) if (5-U0)/2≤Vd, charge constant τ=RC=106×0.1×10-6× 2=0.2s, electric capacity C1Fill
Piezoelectric voltage is UC=U0e-t/τ+5(1-e-t/τ)。
Work as U0Value is smaller, and when meeting situation in (1) under charged state, the charging circuit electric current passes through alternation successively
Power supply 30, first resistor R1, the second diode D2, the first electric capacity C1；Charging rate is very fast.Work as U0It is worth larger, satisfaction charging shape
When (2) under state plant situation, the charging circuit electric current passes through alternating source 30, first resistor R1, second resistance R2 successively,
First electric capacity C1；Charging rate reduces.
When oscillating impulse saltus step is low level, according to the first electric capacity C1 voltage swings, appearance is following two to discharge back
Road：
(1) U is worked as0>2VdWhen, discharge time constant 106×0.1×10-6=0.1s, the first electric capacity C1 voltages when it discharges
For：UC=U0e-t/τ。
(2) if U0≤2VdWhen, discharge time constant τ=RC=106×0.1×10-6× 2=0.2s, the when it discharges
One electric capacity C1 voltages are：UC=U0e-t/τ。
Work as U0Be worth it is larger, when meeting situation in (1) under charged state, the discharge circuit electric current successively pass through first
Electric capacity C1, second resistance R2, the first diode D1, induction electrode 10；The velocity of discharge is very fast.Work as U0Value is smaller, meets electric discharge shape
When (2) under state plant situation, the discharge circuit electric current passes through the first electric capacity C1, second resistance R2, first resistor R1 successively,
Induction electrode 10；The velocity of discharge reduces.
When the frequency of alternating source 30 is very high, the relation that the first electric capacity C1 is changed over time is substantially such as Fig. 3 institutes
Show；In the charge-discharge circuit 20 of reality, the first electric capacity C1 passes through discharge and recharge of the charge-discharge circuit 20 to induction electrode 10
All the time carrying out.When liquid is close to induction electrode 10, weak electromagnetic field existing at induction electrode 10 is conducted in liquid
In electrolyte, while portion of energy is consumed, the electric charge of the first electric capacity C1 supplements will be reduced, therefore the first electric capacity C1 voltage will
Decline, when the first electric capacity C1 magnitude of voltage variable quantities reach minimum detection required precision, the signal processing circuit 40 can lead to
Crossing calculating has recognised that liquid or other conductive bodies close to induction electrode 10.Now, shown first electric capacity C1 is with the time
Variation relation is as shown in figure 4, when the first electric capacity C1 voltage is decreased obviously in figure, and as induction electrode 10 senses liquid
When.
Based on above-described embodiment, the signal processing circuit 40 includes voltage acquisition module, computing module and liquid level identification
Module.Wherein described voltage acquisition module is used for the current charging/discharging voltage for obtaining the capacitor storage unit；The calculating mould
Block is used to the current charging/discharging voltage carrying out mathematic interpolation with default magnitude of voltage；The liquid level identification module is used for basis
The current charging/discharging voltage carries out difference result with default magnitude of voltage and identifies liquid level.
The voltage acquisition module includes the input of analog to digital conversion circuit analog-digital conversion circuit as described and the discharge and recharge
The output end connection of circuit 20, that is, it is used for the magnitude of voltage for detecting the first electric capacity C1, analog to digital conversion circuit is by the charge-discharge circuit
The analog quantity of 20 outputs is converted into digital output to the controller 41.The controller 41 is preferably MCU
(Microcontroller Unit).MCU can pass through I2C (Inter-Integrated Circuit) circuits and ancillary equipment
It is attached.
The present invention also proposes a kind of liquid-level detecting method, for the capacitor storage unit collected according to voltage acquisition module
Charging/discharging voltage, to identify liquid level.Referring to Fig. 5, the liquid-level detecting method includes：S1, obtain capacitor storage unit
Current charging/discharging voltage；S2, the current charging/discharging voltage and the first predeterminated voltage are subjected to mathematic interpolation；S3, according to institute
The difference result for stating current charging/discharging voltage and the first predeterminated voltage identifies liquid level.
In the present embodiment, first predeterminated voltage is the initial voltage value of capacitor energy storage circuit, that is, works as induction electrode
10 when being not sensed by liquid, the initial value of capacitor storage unit.It should be noted that according to different class of liquids and contain institute
The difference of the equipment mode of operation of liquid is stated, the initial value of the capacitor energy storage circuit has difference.
Further, referring to Fig. 6, because capacitor storage unit constantly carries out discharge and recharge, thus its magnitude of voltage can be one
In fixed section change, in order to prevent because the charging/discharging voltage value normal fluctuation of capacitor storage unit and caused by routine executing step
S3；Thus also include after the step S2 is performed：S4, by the difference of the current charging/discharging voltage and the first predeterminated voltage
As a result compared with the second predeterminated voltage；S5, when the difference result of the current charging/discharging voltage and the first predeterminated voltage is small
When second predeterminated voltage, return to circulation and perform the step S1-S2, until the current charging/discharging voltage
It is more than second predeterminated voltage with the difference result of the first predeterminated voltage, performs the step S3.So cause only when sense
After answering electrode 10 to sense liquid, program can just perform S3, improve the accuracy of Programmable detection.
Yet further, referring to Fig. 7, in order to exclude liquid level foam or the extraneous factor such as rock so that induction electrode 10
Liquid level is sensed, so as to cause voltage change on capacitor storage unit so that program performs S3, so as to cause to judge by accident.Thus will
The S5 is further separated into step S51, S52, S53 and S54.Wherein S51：When the current charging/discharging voltage and the first default electricity
When the difference result of pressure is less than or equal to second predeterminated voltage, returns to circulation and perform the step S1-S2；S52, work as institute
When stating the difference result of current charging/discharging voltage and the first predeterminated voltage and being more than second predeterminated voltage, in current count number
Add 1 on n；S53 judges that the n reaches goal-selling number.If n has reached goal-selling number, step S54 is performed；If n is not
Reach goal-selling number, then return and perform the step S1；Wherein described goal-selling number can be multiple, to improve
State the accuracy that level sensing program successfully be detected actual liquid level.
It should be noted that, counter needs the current charging/discharging voltage and the of continuous detection goal-selling number herein
The difference result of one predeterminated voltage is more than second predeterminated voltage, can just go to liquid level processing routine.If goal-selling is not arrived
During number, detect that the difference result of the current charging/discharging voltage and the first predeterminated voltage is less than or equal to described second and preset
Voltage, then n re-start counting.
Based on above-described embodiment, the step S3 is after liquid level is identified, you can starts liquid level processing routine, the liquid level
The mode of processing has a variety of.In the present embodiment, such as liquid level warning indicator lamp, alarm can be sent by sending alarm signal
The sound, it is automatic to disconnect the device power supply (DPS) for containing the liquid, or reduce the modes such as heating power.
The present invention also proposes a kind of wall-breaking machine, referring to Fig. 8, the wall-breaking machine includes cup 51 and level sensing electricity
Road, the concrete structure of the liquid level detection circuit is with reference to above-described embodiment, because this wall-breaking machine employs above-mentioned all embodiments
Whole technical schemes, therefore all beneficial effects at least caused by the technical scheme with above-described embodiment, it is not another herein
One repeats.Wherein, the induction electrode 10 of the liquid level detection circuit is arranged on the cup 51；The cup 51 is used to house
Thing to be mixed.The induction electrode 10 is preferably conductor, to strengthen the electric conductivity of the induction electrode 10, the induction electrode
10 be preferably metal material, can be tinsel or the metal of spring pattern is made.
Based on above-described embodiment, the induction electrode 10 of the liquid level detection circuit be arranged on the cup 51 outer surface or
It is embedded in the wall of cup of the cup 51.To realize the separation with liquid in cup, induction electrode 10 is prevented to be corroded, and avoid dirt
Liquid in dyeing cup.
Based on above-described embodiment, the wall-breaking machine also includes the insulating part being connected with the cup 51, and the insulating part encloses
Into cavity, the induction electrode 10 is positioned in the cavity；To realize isolating for the induction electrode 10 and the liquid.
Based on above-described embodiment, referring to Fig. 9, the liquid level detection circuit has multiple, multiple liquid level detection circuits
Induction electrode 10 be separately positioned on height and position different on the cup 51, with realize in cup liquid height realize segmentation
Monitoring.In the present embodiment, each induction electrode 10 corresponds to a capacitor energy storage circuit and charge-discharge circuit 20 respectively, for diagram side
Just, several capacitor energy storage circuits and several charge-discharge circuits 20 corresponding to several induction electrodes 10 are defined as liquid level sample circuit
2, and the sample circuit and controller 41 is integrated on a circuit board, to form level sensing module 1.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in the scope of patent protection of the present invention.
Claims (10)
- A kind of 1. liquid level detection circuit, it is characterised in that including：Induction electrode, for sensing liquid level to be measured；Capacitor storage unit；Charge-discharge circuit, the input of the charge-discharge circuit, the induction electrode and alternating source interconnection, the discharge and recharge The output end of circuit is connected with the capacitor storage unit；The charge-discharge circuit, for the electricity exported according to the alternating source Source signal carries out discharge and recharge to the capacitor storage unit；Signal processing circuit, the input of the signal processing circuit signal are connected with the output end of the charge-discharge circuit；Should Signal processing circuit, the capacitance signal for detecting the induction electrode generation cause the discharge and recharge electricity of the capacitor storage unit The change of pressure, to identify liquid level.
- 2. liquid level detection circuit as claimed in claim 1, it is characterised in that the charge-discharge circuit includes the first load, the Two loads, the first diode, the second diode；The capacitor storage unit includes the first electric capacity；The first end of first load is the input of the charge-discharge circuit, the second end and described the of first load The first end connection of two loads；Second end of second load is connected with the first end of first electric capacity；First electricity The the second end ground connection held；The negative electrode of first diode is connected with the first end of the described first load, the anode of the first diode and described second The anode connection of diode, the negative electrode of second diode are connected with the first end of the first electric capacity；The output end of the charge-discharge circuit is the first end of first electric capacity.
- 3. liquid level detection circuit as claimed in claim 2, it is characterised in that first load and the second load are electricity Resistance.
- 4. the liquid level detection circuit as described in claims 1 to 3 any one, it is characterised in that the signal processing circuit bag Include：Voltage acquisition module, for obtaining the current charging/discharging voltage of the capacitor storage unit；Computing module, for the current charging/discharging voltage to be carried out into mathematic interpolation with default magnitude of voltage；Liquid level identification module, liquid is identified for carrying out difference result with default magnitude of voltage according to the current charging/discharging voltage Position.
- A kind of 5. liquid-level detecting method, it is characterised in that including：S1, obtain the current charging/discharging voltage of capacitor storage unit；S2, the current charging/discharging voltage and the first predeterminated voltage are subjected to mathematic interpolation；S3, liquid level is identified according to the difference result of the current charging/discharging voltage and the first predeterminated voltage.
- 6. liquid-level detecting method as claimed in claim 5, it is characterised in that perform the step S2 also includes afterwards：S4, by the current charging/discharging voltage with the difference result of the first predeterminated voltage compared with the second predeterminated voltage；S5, when the difference result of the current charging/discharging voltage and the first predeterminated voltage is less than or equal to the described second default electricity During pressure, return to circulation and perform the step S1-S2, until the difference result of the current charging/discharging voltage and the first predeterminated voltage More than second predeterminated voltage, the step S3 is performed.
- 7. liquid-level detecting method as claimed in claim 6, it is characterised in that the S5 includes：S51, preset when the difference result of the current charging/discharging voltage and the first predeterminated voltage is less than or equal to described second During voltage, return to circulation and perform the step S1-S2；S52, when the difference result of the current charging/discharging voltage and the first predeterminated voltage is more than second predeterminated voltage, Add 1 in current count frequency n；S53 judges that the n reaches goal-selling number；It is then to perform step S54；It is no, then return and perform the step S1；S54, when the n reaches goal-selling number, then perform the step S3.
- 8. a kind of wall-breaking machine, it is characterised in that the wall-breaking machine includes cup and as described in Claims 1-4 any one Liquid level detection circuit, the induction electrode of the liquid level detection circuit are arranged on the cup.
- 9. wall-breaking machine as claimed in claim 6, it is characterised in that the induction electrode of the liquid level detection circuit is arranged on described The outer surface of cup.
- 10. the wall-breaking machine as described in claim 8 to 9 any one, it is characterised in that the liquid level detection circuit have it is multiple, The induction electrode of multiple liquid level detection circuits is separately positioned on height and position different on the cup.
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| CN201610755771.0A CN107782408B (en) | 2016-08-29 | 2016-08-29 | Liquid level detection circuit, liquid level detection method and wall breaking machine |
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| CN201610755771.0A CN107782408B (en) | 2016-08-29 | 2016-08-29 | Liquid level detection circuit, liquid level detection method and wall breaking machine |
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