CN209372183U - A kind of water level sensor - Google Patents
A kind of water level sensor Download PDFInfo
- Publication number
- CN209372183U CN209372183U CN201920212475.5U CN201920212475U CN209372183U CN 209372183 U CN209372183 U CN 209372183U CN 201920212475 U CN201920212475 U CN 201920212475U CN 209372183 U CN209372183 U CN 209372183U
- Authority
- CN
- China
- Prior art keywords
- resistance
- water level
- level signal
- probe
- voltage
- 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 water level sensors, comprising: high water level signal processing module, low water level signal processing module and water level probe；Water level probe includes at least: low-level probe, high-level probe and reference level probe；Low-level probe and reference level probe are connected with low water level signal processing module；High-level probe and reference level probe are connected with high water level signal processing module；Low-level probe acquires low water level signal, reference level probe collection reference level signal, and low water level signal processing module obtains the first initial value to low water level signal and reference level signal processing and exports first voltage signal after treatment；High-level probe acquires high water level signal, and high water level signal processing module obtains the second initial value to high water level signal and reference level signal processing and exports second voltage signal after treatment.The utility model integrates high water level monitoring and low water level monitoring, can more acurrate detecting water level.
Description
Technical field
The utility model relates to sensor technical field more particularly to a kind of water level sensors.
Background technique
The effect of automobile fuel oil filter is other than filtering out the impurity in fuel oil, and there are one important function, exactly filters out
Moisture in fuel oil.Fuel filter is according to the principle that the density contrast of water and oil is filtered the moisture in fuel oil using gravitational settling
Out, it and is stored in collecting bowl.It when water accumulates to a certain extent, to discharge water in time, otherwise water can enter oil supply system, make
At oil supply system components survey corrosion, wear it is stuck, or even damage.If discharge time is too long, has fuel oil and be discharged together, make
At energy waste and environmental pollution, if discharge time is too short, water is remaining too many, and interval between discharges shorten, the frequency of draining
Rate is high.How to the problem of accurate detection of water level is to be solved.
Utility model content
The utility model embodiment provides a kind of water level sensor, it is intended to which water level sensor cannot in the prior art for solution
The problem of accurate detecting water level.
The first aspect of the utility model embodiment provides a kind of water level sensor characterized by comprising high water level
Signal processing module, low water level signal processing module and water level probe；The water level probe includes at least: low-level probe, height
Water level probe and reference level probe；
The low-level probe and the reference level probe are connected with the low water level signal processing module；The Gao Shui
Position probe and the reference level probe are connected with the high water level signal processing module；
The low water level signal of the low-level probe acquisition low water level, the ginseng of the reference level probe collection reference level
Water level signal is examined, the low water level signal processing module receives the low water level signal and the reference level signal and to described
Low water level signal and the reference level signal carry out processing and obtain the first initial value, and first initial value is defeated after treatment
First voltage signal out；The high water level signal of the high-level probe acquisition high water level, the high water level signal processing module connect
Receive the high water level signal and the reference level signal and to the high water level signal and the reference level signal at
Reason obtains the second initial value, and second initial value exports second voltage signal after treatment.
In one embodiment, the vertex of the reference level probe is less than or equal to the vertex of the low-level probe.
In one embodiment, the vertex of the high-level probe is higher than the vertex of the low-level probe.
In one embodiment, the high water level signal processing module includes that first voltage comparing unit and the first protection are single
Member；
The first input end of the first voltage comparing unit connects voltage, the second input of the first voltage comparing unit
End is connected with the high-level probe, the third input terminal of the first voltage comparing unit and the reference level probe phase
Even, the output end of the first voltage comparing unit is connected with the input terminal of first protection location, and first protection is single
The output end of member is the output end of the high water level signal processing module.
In one embodiment, the first voltage comparing unit includes resistance R1, resistance R2, resistance R3, resistance R4, electricity
Hinder R5, resistance R6, capacitor C1, the first operational amplifier and the first triode；
The first end of the resistance R1 be the first voltage comparing unit the second input terminal, the first of the resistance R2
End and the first end of the resistance R3 connect the first input end to form the first voltage comparing unit altogether, and the of the resistance R1
The two ends anti-phase input with the second end of the resistance R2, the first end of the capacitor C1 and first operational amplifier respectively
End is connected, and the second end of the second end of the capacitor C1 and the resistance R4 connect to form the of the first voltage comparing unit altogether
The second end of three input terminals, the second end of the capacitor C1 and the resistance R4 are grounded altogether, the second end point of the resistance R3
It is not connected with the non-inverting input terminal of the first end of the resistance R4 and first operational amplifier, first operational amplifier
Output end be connected with the first end of the resistance R5, the second end of the resistance R5 respectively with the first end of the resistance R6 and
The base stage of first triode is connected, the output of the extremely described first voltage comparing unit of the current collection of first triode
The second end of end, the emitter of first triode and the resistance R6 are grounded altogether.
In one embodiment, first protection location includes first diode, resistance R7 and the insurance of the first self- recoverage
Silk；
The cathode of the first diode is the input terminal of first protection location, the anode point of the first diode
It is not connected with the first end of the first end of the resistance R7 and the first self-recovery fuse, the second end ground connection of the resistance R7,
The second end of first self-recovery fuse is the output end of first protection location.
In one embodiment, the low water level signal processing module includes that second voltage comparing unit and the second protection are single
Member；
The first input end of the second voltage comparing unit connects voltage, the second input of the second voltage comparing unit
End is connected with the low-level probe, the third input terminal of the second voltage comparing unit and the reference level probe phase
Even, the output end of the second voltage comparing unit is connected with the input terminal of second protection location, and second protection is single
The output end of member is the output end of the low water level signal processing module.
In one embodiment, the second voltage comparing unit includes resistance R9, resistance R10, resistance R11, resistance
R12, resistance R13, resistance R14, capacitor C2, second operational amplifier and the second triode；
The first end of the resistance R9 is the second input terminal of the second voltage comparing unit, the of the resistance R10
The first end of one end and the resistance R11 meet the first input end to form the second voltage comparing unit, the resistance R9 altogether
Second end it is anti-with the second end of the resistance R10, the first end of the capacitor C2 and the second operational amplifier respectively
Phase input terminal is connected, and the second end of the second end of the capacitor C2 and the resistance R12 connect altogether to be formed the second voltage and compare
The second end of the third input terminal of unit, the second end of the capacitor C2 and the resistance R12 are grounded altogether, the resistance R11
Second end be connected respectively with the non-inverting input terminal of the first end of the resistance R12 and the second operational amplifier, described
The output end of two operational amplifiers is connected with the first end of the resistance R13, the second end of the resistance R13 respectively with the electricity
The first end of resistance R14 is connected with the base stage of second triode, the extremely described second voltage of the current collection of second triode
The second end of the output end of comparing unit, the emitter of second triode and the resistance R14 are grounded altogether.
In one embodiment, the water level sensor further includes Voltage stabilizing module；
The Voltage stabilizing module is connected with the high water level signal processing module and the low water level signal processing module respectively；
The pressure stabilizing mould will export respectively after supply voltage steady pressure treatment fastly to the high water level signal processing module and institute
State low water level signal processing module.
In one embodiment, the Voltage stabilizing module includes the second diode, third diode, capacitor C3, the three or three pole
Pipe, resistance R15, the 4th diode and capacitor C4；
The anode of the first end of second diode and the third diode connects to form the of the Voltage stabilizing module altogether
One input terminal, the second end of second diode are the second input terminal of the Voltage stabilizing module, the of second diode
Two ends, the second end of the capacitor C3, the anode of the 4th diode and the second end of the capacitor C4 are grounded altogether, described
The cathode of third diode respectively with the first end of the capacitor C3, the first end and the third transistor of the resistance R15
Collector be connected, the second end of the resistance R15 respectively with the base stage of the third transistor and the 4th diode
Cathode is connected, and the first end of the emitter of the third transistor and the capacitor C4 connect the output to form the Voltage stabilizing module altogether
End.
The utility model by setting low-level probe, high-level probe and reference level probe, by low-level probe and
Reference level probe collection to signal be transmitted to low water level signal processing module, high-level probe and reference level probe are adopted
The signal collected is transmitted to high water level signal processing module, passes through low water level signal processing module and high water level signal processing module
Processing and peripheral circuit processing after the voltage signal that exports judge water level, the monitoring of the utility model collection high water level and low water
Position monitoring is integrated, can more acurrate detecting water level.
Detailed description of the invention
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the water level sensor that one embodiment of the utility model provides；
Fig. 2 is the structural schematic diagram one of the probe for the water level sensor that one embodiment of the utility model provides；
Fig. 3 is the structural schematic diagram two of the probe for the water level sensor that one embodiment of the utility model provides；
The circuit connection diagram of high water level signal processing module in Fig. 1 that Fig. 4 provides for one embodiment of the utility model；
The circuit connection diagram of low water level signal processing module in Fig. 1 that Fig. 5 provides for one embodiment of the utility model；
Fig. 6 is the circuit connection diagram for the Voltage stabilizing module that one embodiment of the utility model provides；
Fig. 7 is the concrete application figure one that one embodiment of the utility model provides；
Fig. 8 is the concrete application figure two that one embodiment of the utility model provides.
Specific embodiment
In order to make those skilled in the art more fully understand this programme, below in conjunction with attached in this programme embodiment
Figure, is explicitly described the technical solution in this programme embodiment, it is clear that described embodiment is this programme a part
Embodiment, instead of all the embodiments.Based on the embodiment in this programme, those of ordinary skill in the art are not being made
The range of this programme protection all should belong in every other embodiment obtained under the premise of creative work.
The specification and claims of this programme and term " includes " and other any deformations in above-mentioned attached drawing are
Refer to " including but not limited to ", it is intended that cover and non-exclusive include.In addition, term " first " and " second " etc. are for distinguishing
Different objects, not for description particular order.
The realization of the utility model is described in detail below in conjunction with specific attached drawing:
Fig. 1 shows a kind of structure of water level sensor provided by an embodiment of the present invention, for ease of description,
Part relevant to the utility model embodiment is illustrated only, details are as follows:
As shown in Figure 1, water level sensor 1 provided by the utility model embodiment, including high water level signal processing module
110, low water level signal processing module 120 and water level probe；The water level probe includes at least: low-level probe 21, high water level
Probe 11 and reference level probe 31；
The low-level probe 21 and the reference level probe 31 are connected with the low water level signal processing module 120；
The high-level probe 11 and the reference level probe 31 are connected with the high water level signal processing module 110；
The low-level probe 21 acquires the low water level signal of low water level, and the reference level probe 31 acquires reference level
Reference level signal, the reference level is less than or equal to low water level, and the low water level signal processing module 120 receives described
Low water level signal and the reference level signal simultaneously carry out processing acquisition to the low water level signal and the reference level signal
First initial value, first initial value export first voltage signal after treatment；The high-level probe 11 acquires Gao Shui
The high water level signal of position, the high water level are higher than low water level, and the high water level signal processing module 110 receives the high water level letter
Number and the reference level signal and processing is carried out to the high water level signal and the reference level signal to obtain second initial
Value, second initial value export second voltage signal after treatment.
In the present embodiment, low water level signal processing module 120 and high water level signal processing module 110 export initial
Value, is all respectively necessary for an external pull-up resistor and power supply, finally exports high level or low level, passes through high level and low level
To judge high water level or low water level.
In the utility model embodiment, by the way that low-level probe 21, high-level probe 11 and reference level probe 31 is arranged,
Low-level probe 21 and the collected signal of reference level probe 31 are transmitted to low water level signal processing module 120, by Gao Shui
Position probe 11 and the collected signal of reference level probe 31 are transmitted to high water level signal processing module 110, are believed by low water level
The initial value that number processing module 120 and high water level signal processing module 110 obtain after handling is believed using the voltage of processing output
Number judge that water level, the utility model integrate high water level monitoring and low water level monitoring, be more convenient for monitoring water level, and more integrated,
When needing to monitor high and low water level, does not have to two water level sensors of setting, more acurrate can only be detected with using the utility model
Water level.
In one embodiment of the utility model, reference level probe 31 can be two, the first reference level probe
With the second reference level probe, the first reference level probe and low-level probe 21 and the low water level signal processing module 120
It is connected, the second reference level probe and high-level probe 11 are connected with the high water level signal processing module 110.
The vertex of first reference level probe and the vertex of the second reference level probe are in same level, and the first ginseng
The vertex on the vertex and the second reference level probe of examining water level probe is less than or equal to the vertex of low-level probe 21.
In one embodiment of the utility model, the vertex of reference level probe 31 is visited less than or equal to the low water level
The vertex of needle 21.
In one embodiment of the utility model, the vertex of high-level probe 11 is higher than the top of the low-level probe 21
Point.
As shown in Fig. 2, in a particular application, if the utility model water level sensor is arranged in container bottom, tips of probes
Upper, at this point, the vertex of high-level probe 11 is higher than the vertex of the low-level probe 21, the vertex of reference level probe 31 is low
In or equal to low-level probe 21 vertex, if the bottom of high-level probe 11, low-level probe 21 and reference level probe 31
In same level, then the length of high-level probe 11 is greater than the length of low-level probe 21, the length of low-level probe 21
More than or equal to the length of reference level probe 31.
As shown in figure 3, tips of probes is under, at this point, Gao Shui if the utility model water level sensor is arranged in container top
The vertex of position probe 11 is higher than the vertex of the low-level probe 21, and the vertex of reference level probe 31 is less than or equal to low water level
The vertex of probe 21, if the bottom of high-level probe 11, low-level probe 21 and reference level probe 31 in same level,
Then the length of high-level probe 11 is less than the length of low-level probe 21, and the length of low-level probe 21, which is less than or equal to, refers to water
The length of position probe 31.
As shown in figure 4, high water level signal processing module 110 includes the first electricity in one embodiment of the utility model
Press comparing unit 111 and the first protection location 112.
The first input end of the first voltage comparing unit 111 connects voltage, and the of the first voltage comparing unit 111
Two input terminals are connected with the high-level probe 11, the third input terminal of the first voltage comparing unit 111 and the reference
Water level probe 31 is connected, the input terminal phase of the output end of the first voltage comparing unit 111 and first protection location 112
Even, the output end of first protection location 112 is the output end of the high water level signal processing module 110.
In the present embodiment, the first input end of first voltage comparing unit 111 passes through Voltage stabilizing module 130 and external power supply
It is connected.
As shown in figure 4, first voltage comparing unit 111 includes resistance R1, electricity in one embodiment of the utility model
Hinder R2, resistance R3, resistance R4, resistance R5, resistance R6, capacitor C1, the first operational amplifier U1 and the first triode Q1；
The first end of the resistance R1 is the second input terminal of the first voltage comparing unit 111, the resistance R2's
First end and the first end of the resistance R3 connect the first input end to form the first voltage comparing unit 111, the electricity altogether
Hinder R1 second end respectively with the second end of the resistance R2, the first end of the capacitor C1 and the first operational amplifier U1
Inverting input terminal be connected, the second end of the second end of the capacitor C1 and the resistance R4 connect to form the first voltage ratio altogether
Compared with the third input terminal of unit 111, the second end of the second end of the capacitor C1 and the resistance R4 are grounded altogether, the resistance
The second end of R3 is connected with the non-inverting input terminal of the first end of the resistance R4 and the first operational amplifier U1 respectively, described
The output end of first operational amplifier U1 is connected with the first end of the resistance R5, the second end of the resistance R5 respectively with it is described
The first end of resistance R6 is connected with the base stage of the first triode Q1, the current collection extremely described first of the first triode Q1
The output end of voltage comparison unit 111, the emitter of the first triode Q1 and the second end of the resistance R6 are grounded altogether.
In the present embodiment, the first end of the forward voltage end of the first operational amplifier U1 and resistance R3, resistance R2 the
One end connects positive supply, the negative voltage end of the first operational amplifier U1 and second end, the second end of capacitor C1 of resistance R4 altogether
It is grounded altogether.
As shown in figure 4, in one embodiment of the utility model, the first protection location 112 include first diode D1,
Resistance R7 and the first self-recovery fuse F1；
The cathode of the first diode D1 is the input terminal of first protection location 112, the first diode D1
Anode be connected respectively with the first end of the first end of the resistance R7 and the first self-recovery fuse F1, the of the resistance R7
Two ends ground connection, the second end of the first self-recovery fuse F1 are the output end of first protection location 112.
In the present embodiment, the second initial value that resistance R7 is used to limit the output of high water level signal processing module 110 passes through
High value that treated.
As shown in figure 5, low water level signal processing module 120 includes the second electricity in one embodiment of the utility model
Press comparing unit 121 and the second protection location 122；
The first input end of the second voltage comparing unit 121 connects voltage, and the of the second voltage comparing unit 121
Two input terminals are connected with the low-level probe 21, the third input terminal of the second voltage comparing unit 121 and the reference
Water level probe 31 is connected, the input terminal phase of the output end of the second voltage comparing unit 121 and second protection location 122
Even, the output end of second protection location 122 is the output end of the low water level signal processing module 120.
In the present embodiment, the first input end of second voltage comparing unit 121 passes through Voltage stabilizing module 130 and external power supply
It is connected.
As shown in figure 5, second voltage comparing unit 121 includes resistance R9, electricity in one embodiment of the utility model
Hinder R10, resistance R11, resistance R12, resistance R13, resistance R14, capacitor C2, second operational amplifier U2 and the second triode Q2；
The first end of the resistance R9 is the second input terminal of the second voltage comparing unit 121, the resistance R10's
First end and the first end of the resistance R11 connect the first input end to form the second voltage comparing unit 121, the electricity altogether
Hinder R9 second end respectively with the second end of the resistance R10, the first end and the second operational amplifier of the capacitor C2
The inverting input terminal of U2 is connected, and the second end of the second end of the capacitor C2 and the resistance R12 connect to form second electricity altogether
The second end of the third input terminal of pressure comparing unit 121, the second end of the capacitor C2 and the resistance R12 are grounded altogether, institute
State the second end of the resistance R11 non-inverting input terminal with the first end of the resistance R12 and the second operational amplifier U2 respectively
It is connected, the output end of the second operational amplifier U2 is connected with the first end of the resistance R13, and the second of the resistance R13
End is connected with the base stage of the first end of the resistance R14 and the second triode Q2 respectively, the collection of the second triode Q2
Electrode is the output end of the second voltage comparing unit 121, and the emitter of the second triode Q2 is with the resistance R14's
Second end is grounded altogether.
In the present embodiment, the first end of the forward voltage end of second operational amplifier U2 and resistance R10, resistance R11
First end connects positive supply altogether, and the second of the second end of the negative voltage end of second operational amplifier U2 and resistance R12, capacitor C2
End is grounded altogether.
In one embodiment of the utility model, the first operational amplifier U1 and second operational amplifier U2 can use one
A two-way operational amplifier LM2904 is realized, because there are two operational amplifiers in two-way operational amplifier, uses two-way operation
Amplifier only needs a chip when making water level sensor, saves space.
As shown in figure 5, in one embodiment of the utility model, the second protection location 122 include the 5th diode D5,
Resistance R8 and the second self-recovery fuse F2；
The cathode of the 5th diode D5 is the input terminal of second protection location 122, the 5th diode D5
Anode be connected respectively with the first end of the first end of the resistance R8 and the second self-recovery fuse F2, the of the resistance R8
Two ends ground connection, the second end of the second self-recovery fuse F2 are the output end of second protection location 122.
In the present embodiment, the first initial value that resistance R8 is used to limit the output of low water level signal processing module 120 passes through
High value that treated.
In a particular application, water level sensor is arranged in container bottom, and tips of probes used when upper:
(1) probe high-level probe 11, low-level probe 21 and reference level probe 31 do not meet water i.e. water level in low water
When below 21 position of probe of position, the inverting input terminal voltage of the second operational amplifier U2 in low water level signal processing module 120
Higher than non-inverting input terminal voltage, second operational amplifier U2 exports low level, the second triode Q2 cut-off, low water level signal processing
First initial value of 120 output end of module output exports high level after treatment；In high water level signal processing module 110
The inverting input terminal voltage of one operational amplifier U1 is higher than the non-inverting input terminal voltage of the first operational amplifier U1, and the first operation is put
Big device U1 exports low level, the first triode Q1 cut-off, the second initial value of 110 output end of high water level signal processing module output
The high level of processing output after treatment.
(2) probe low-level probe 21 and reference level probe 31 meet water, and high-level probe 11 does not meet water i.e. water level low
When above 11 or less high-level probe in 21 position of water level probe, the inverting input terminal voltage of second operational amplifier U2 is lower than second
The non-inverting input terminal voltage of operational amplifier U2, second operational amplifier U2 export low level, the second triode Q2 conducting, low water
First initial value of the output end output of position signal processing module 120 exports low level, i.e. low-level probe 21 after treatment
Meet water alarm；The inverting input terminal voltage of the first operational amplifier U1 in high water level signal processing module 110 is higher than the first fortune
The non-inverting input terminal voltage of amplifier U1 is calculated, the first operational amplifier U1 exports low level, the first triode Q1 cut-off, high water level
Second initial value of the output end output of signal processing module 110 exports high level after treatment.
(3) probe high-level probe 11, low-level probe 21 and reference level probe 31 all meet water, that is, water level in high water level
When more than 11 position of probe, the inverting input terminal voltage of second operational amplifier U2 is same mutually defeated lower than second operational amplifier U2
Enter and hold voltage, second operational amplifier U2 exports low level, and the second triode Q2 is connected, and low water level signal processing module 120 is defeated
The first initial value out exports low level after treatment, i.e. low water level meets water alarm；In high water level signal processing module 110
The inverting input terminal voltage of first operational amplifier U1 is lower than the non-inverting input terminal voltage of the first operational amplifier U1, the first operation
The output end of amplifier U1 exports low level, the first triode Q1 conducting, high water level signal processing module 110 export second at the beginning of
Initial value exports low level after treatment, i.e. high water level meets water alarm.
When water level is below 31 place height of low-level probe 21 and reference level probe, low water level signal processing module
120 and high water level signal processing module 110 output initial value after treatment export high level；When water level reaches low water
Where position probe 21 and reference level probe 31 when height, i.e. low water level, the first of the output of low water level signal processing module 120
Initial value exports low level after treatment, and the second initial value of the output of high water level signal processing module 110 is after treatment
Export high level；When water level reaches the height, i.e. high water level at 11 place of high-level probe, low water level signal processing module 120
Low level is exported after treatment with the initial value of the output of high water level signal processing module 110.Low water level signal and Gao Shui
The corresponding relationship that position signal meets water state with three probes is shown in Table 1, and table 1 " 0 " indicates low level, and " 1 " indicates high level.
Table 1
As shown in fig. 6, water level sensor further includes Voltage stabilizing module 130 in one embodiment of the utility model；
The Voltage stabilizing module 130 respectively with the high water level signal processing module 110 and the low water level signal processing mould
Block 120 is connected；
The pressure stabilizing mould will export respectively after supply voltage steady pressure treatment fastly to 110 He of high water level signal processing module
The low water level signal processing module 120.
In one embodiment of the utility model, the Voltage stabilizing module 130 includes the second diode D2, third diode
D3, capacitor C3, third transistor Q3, resistance R15, the 4th diode D4 and capacitor C4；
The anode of the first end of the second diode D2 and the third diode D3 connect to form the Voltage stabilizing module altogether
130 first input end, the second end of the second diode D2 are the second input terminal of the Voltage stabilizing module 130, described the
The second end of two diode D2, the second end of the capacitor C3, the anode of the 4th diode D4 and the capacitor C4
Two ends are grounded altogether, the cathode of the third diode D3 respectively with the first end of the capacitor C3, the resistance R15 first
End is connected with the collector of the third transistor Q3, and the second end of the resistance R15 is respectively with the third transistor Q3's
Base stage is connected with the cathode of the 4th diode D4, the first end of the emitter of the third transistor Q3 and the capacitor C4
The output end to form the Voltage stabilizing module 130 is connect altogether.
In the present embodiment, the 4th diode D4 is zener diode.Second diode D2 is TVS diode.
In specific application, the first initial value and the second initial value will could export electricity after the processing of peripheral circuit
Press signal, that is, high level signal or low level signal.Water level sensor output signal mode can basis in actual use
Internal circuit is modified in client's actual demand.Water level sensor herein is exported using pull-up resistor formula, by modifying internal circuit
The output of pull down resistor formula may be implemented in (replacement triode, road of relocating).
When sensor application is when on automobile, peripheral circuit can be vehicle electronic control unit ECU (Electronic
Control Unit) internal pull-up resistor and power supply.
As Figure 7-8, in specific application, generally there are two types of forms for the way of output of water level sensor, and one is upper
Pull-up resistor formula, pull-up resistor formula output as shown in Figure 7, including power module and ECU, wherein ECU is adopted by its internal signal
The voltage signal VH and low water level that collector, pull-up resistor RH, pull-up resistor RL and internal electric source U acquisition high water level export are defeated
Voltage signal VL out；Another kind is pull down resistor formula, only need to pull down a resistance eutral grounding in output end, as shown in Figure 8
The output of pull down resistor formula, including power module and ECU, wherein ECU by internal signal Acquisition Circuit, pull down resistor RH1 and
Pull down resistor RL1 acquires the voltage signal VH of high water level output and the voltage signal VL of low water level output.
The above, above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (10)
1. a kind of water level sensor characterized by comprising high water level signal processing module, low water level signal processing module and
Water level probe；The water level probe includes at least: low-level probe, high-level probe and reference level probe；
The low-level probe and the reference level probe are connected with the low water level signal processing module；The high water level is visited
Needle and the reference level probe are connected with the high water level signal processing module；
The low water level signal of the low-level probe acquisition low water level, the reference water of the reference level probe collection reference level
Position signal, the low water level signal processing module receive the low water level signal and the reference level signal and to the low water
Position signal and the reference level signal carry out processing and obtain the first initial value, and first initial value exports the after treatment
One voltage signal；The high water level signal of the high-level probe acquisition high water level, the high water level signal processing module receive institute
It states high water level signal and the reference level signal and processing is carried out to the high water level signal and the reference level signal and obtain
The second initial value is obtained, second initial value exports second voltage signal after treatment.
2. water level sensor as described in claim 1, which is characterized in that the vertex of the reference level probe is less than or equal to
The vertex of the low-level probe.
3. water level sensor as described in claim 1, which is characterized in that the vertex of the high-level probe is higher than the low water
The vertex of position probe.
4. water level sensor as described in claim 1, which is characterized in that the high water level signal processing module includes the first electricity
Press comparing unit and the first protection location；
The first input end of the first voltage comparing unit connects voltage, the second input terminal of the first voltage comparing unit with
The high-level probe is connected, and the third input terminal of the first voltage comparing unit is connected with the reference level probe, institute
The output end for stating first voltage comparing unit is connected with the input terminal of first protection location, first protection location it is defeated
Outlet is the output end of the high water level signal processing module.
5. water level sensor as claimed in claim 4, which is characterized in that the first voltage comparing unit include resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, capacitor C1, the first operational amplifier and the first triode；
The first end of the resistance R1 be the first voltage comparing unit the second input terminal, the first end of the resistance R2 with
The first end of the resistance R3 connects the first input end to form the first voltage comparing unit, the second end of the resistance R1 altogether
Respectively with the inverting input terminal phase of the second end of the resistance R2, the first end of the capacitor C1 and first operational amplifier
Even, the second end of the second end of the capacitor C1 and the resistance R4 connect altogether to be formed the first voltage comparing unit third it is defeated
Enter end, the second end of the second end of the capacitor C1 and the resistance R4 are grounded altogether, the second end of the resistance R3 respectively with
The first end of the resistance R4 is connected with the non-inverting input terminal of first operational amplifier, first operational amplifier it is defeated
Outlet is connected with the first end of the resistance R5, the second end of the resistance R5 respectively with the first end of the resistance R6 and described
The base stage of first triode is connected, the output end of the extremely described first voltage comparing unit of the current collection of first triode, institute
The second end of the emitter and the resistance R6 of stating the first triode is grounded altogether.
6. water level sensor as claimed in claim 4, which is characterized in that first protection location include first diode,
Resistance R7 and the first self-recovery fuse；
The cathode of the first diode be first protection location input terminal, the anode of the first diode respectively with
The first end of the resistance R7 is connected with the first end of the first self-recovery fuse, the second end ground connection of the resistance R7, described
The second end of first self-recovery fuse is the output end of first protection location.
7. water level sensor as described in claim 1, which is characterized in that the low water level signal processing module includes the second electricity
Press comparing unit and the second protection location；
The first input end of the second voltage comparing unit connects voltage, the second input terminal of the second voltage comparing unit with
The low-level probe is connected, and the third input terminal of the second voltage comparing unit is connected with the reference level probe, institute
The output end for stating second voltage comparing unit is connected with the input terminal of second protection location, second protection location it is defeated
Outlet is the output end of the low water level signal processing module.
8. water level sensor as claimed in claim 7, which is characterized in that the second voltage comparing unit include resistance R9,
Resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, capacitor C2, second operational amplifier and the second triode；
The first end of the resistance R9 is the second input terminal of the second voltage comparing unit, the first end of the resistance R10
Connect the first input end to form the second voltage comparing unit altogether with the first end of the resistance R11, the of the resistance R9
Two ends are defeated with the reverse phase of the second end of the resistance R10, the first end of the capacitor C2 and the second operational amplifier respectively
Enter end to be connected, the second end of the second end of the capacitor C2 and the resistance R12 connect to form the second voltage comparing unit altogether
Third input terminal, the second end of the second end of the capacitor C2 and the resistance R12 is grounded altogether, the of the resistance R11
Two ends are connected with the non-inverting input terminal of the first end of the resistance R12 and the second operational amplifier respectively, second fortune
Calculate amplifier output end be connected with the first end of the resistance R13, the second end of the resistance R13 respectively with the resistance
The first end of R14 is connected with the base stage of second triode, the extremely described second voltage ratio of the current collection of second triode
Compared with the output end of unit, the second end of the emitter of second triode and the resistance R14 are grounded altogether.
9. water level sensor as described in claim 1, which is characterized in that the water level sensor further includes Voltage stabilizing module；
The Voltage stabilizing module is connected with the high water level signal processing module and the low water level signal processing module respectively；
The pressure stabilizing mould will export respectively after supply voltage steady pressure treatment fastly to the high water level signal processing module and described low
Water level signal processing module.
10. water level sensor as claimed in claim 9, which is characterized in that the Voltage stabilizing module includes the second diode, third
Diode, capacitor C3, third transistor, resistance R15, the 4th diode and capacitor C4；
The anode of the first end of second diode and the third diode connects to form the first defeated of the Voltage stabilizing module altogether
Entering end, the second end of second diode is the second input terminal of the Voltage stabilizing module, the second end of second diode,
The second end of the second end of the capacitor C3, the anode of the 4th diode and the capacitor C4 is grounded altogether, the third
The cathode of the diode collection with the first end of the capacitor C3, the first end of the resistance R15 and the third transistor respectively
Electrode is connected, the second end of the resistance R15 cathode with the base stage of the third transistor and the 4th diode respectively
It is connected, the first end of the emitter of the third transistor and the capacitor C4 connect the output end to form the Voltage stabilizing module altogether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920212475.5U CN209372183U (en) | 2019-02-19 | 2019-02-19 | A kind of water level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920212475.5U CN209372183U (en) | 2019-02-19 | 2019-02-19 | A kind of water level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209372183U true CN209372183U (en) | 2019-09-10 |
Family
ID=67827130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920212475.5U Active CN209372183U (en) | 2019-02-19 | 2019-02-19 | A kind of water level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209372183U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637570A (en) * | 2020-06-15 | 2020-09-08 | 成都中邦智能科技有限责任公司 | Low power rapid heating system and method for humidifier water tank |
| CN113027784A (en) * | 2021-03-31 | 2021-06-25 | 浙江大元泵业股份有限公司 | Water shortage detection control method for submersible pump |
-
2019
- 2019-02-19 CN CN201920212475.5U patent/CN209372183U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637570A (en) * | 2020-06-15 | 2020-09-08 | 成都中邦智能科技有限责任公司 | Low power rapid heating system and method for humidifier water tank |
| CN113027784A (en) * | 2021-03-31 | 2021-06-25 | 浙江大元泵业股份有限公司 | Water shortage detection control method for submersible pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209372183U (en) | A kind of water level sensor | |
| CN109567280A (en) | Atomizer resistance value detection circuit and electronic cigarette | |
| CN209563497U (en) | Atomizer resistance value detection circuit and electronic cigarette | |
| CN207937579U (en) | A kind of shared automobile power monitoring device | |
| CN208902855U (en) | Low-speed electronic vehicle lithium battery detection circuit | |
| CN208334493U (en) | A kind of current collection circuit for cell management system of electric automobile | |
| CN207717935U (en) | Switching signal detection circuit with self-diagnostic function | |
| CN206235664U (en) | Three-phase and four-line intelligent electric meter and its fall zero line detection circuit | |
| CN110702962B (en) | Universal meter pen of digital multimeter with anti-error measurement function | |
| CN208421116U (en) | A kind of voltage induced formula protection against electric shock circuit and anti-electric shock apparatus | |
| CN204188694U (en) | A kind of current detection circuit of Electric Machine Control | |
| CN204155097U (en) | Analog signal voltage acquisition circuit | |
| CN208006203U (en) | A kind of machine Control system cabinet with humidity alarm function | |
| CN208207045U (en) | For measuring the Acquisition Circuit and frequency converter of high-frequency ac voltage | |
| CN208955996U (en) | Solar energy monitoring device | |
| CN208027549U (en) | A kind of electronic information switching system | |
| CN105402794A (en) | Range hood energy-saving control system based on bandpass filtering amplifying circuit | |
| CN109444526A (en) | A kind of device for the alternating voltage that measurement frequency is variable | |
| CN108414818A (en) | A kind of Acquisition Circuit and frequency converter for measuring high-frequency ac voltage | |
| CN216593663U (en) | Liquid level detection device | |
| CN204964070U (en) | A fault detection device for temperature sensor of refrigerator | |
| CN214538295U (en) | Open-leakage IO pin temperature sampling circuit | |
| CN205595844U (en) | Capacitor discharge circuit, communication interface power supply loop and electronic equipment | |
| CN211042515U (en) | Temperature detection circuit of battery management system of electric automobile | |
| CN218158107U (en) | Voltage and current acquisition system for automobile lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |