CN208012706U - Electric pole type liquid level detection circuit - Google Patents
Electric pole type liquid level detection circuit Download PDFInfo
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- CN208012706U CN208012706U CN201820532862.2U CN201820532862U CN208012706U CN 208012706 U CN208012706 U CN 208012706U CN 201820532862 U CN201820532862 U CN 201820532862U CN 208012706 U CN208012706 U CN 208012706U
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- resistance
- liquid level
- capacitance
- detection circuit
- control circuit
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Abstract
The utility model provides a kind of simple in structure and measures accurate electric pole type liquid level detection circuit, belongs to level sensing field.Including：Liquid level equivalent resistance detection circuit acquires liquid level equivalent resistance using two electrodes, the detection signal output end of liquid level equivalent resistance detection circuit is connect with one end of capacitance C1, the other end of capacitance C1 is connect simultaneously with one end of resistance R1 and one end of resistance R2, the other end of resistance R1 is connect simultaneously with the square-wave signal output end of one end of capacitance C2 and sampling control circuit, another termination power supply of capacitance C2, the other end of resistance R2 is connect simultaneously with the input end of analog signal of one end of capacitance C3 and sampling control circuit, another termination power supply of capacitance C3；Sampling control circuit sends square-wave signal as detection signal to liquid level equivalent resistance detection circuit, and obtains peak-peak voltage according to the analog signal of reception, and then determines the resistance value R of equivalent liquid level resistanceS, and then obtain liquid level.
Description
Technical field
The utility model is related to a kind of liquid level detection circuit, more particularly to a kind of electric pole type liquid level detection circuit.
Background technology
At present for the measurement of liquid level, there is a kind of simple and reliable method, because the resistivity of same solution is basically unchanged,
It is inserted into liquid using two electrodes, the resistance between liquid level two electrodes of difference is different, and then realizes level gauging；Existing skill
The resistance is measured in art, leads to constant dc for a long time, can make electrode polarization, measured value inaccurate in this way.
Utility model content
Against the above deficiency, the utility model provides a kind of simple in structure and measures accurate electric pole type level sensing electricity
Road.
The electric pole type liquid level detection circuit of the utility model, the liquid level detection circuit include liquid level equivalent resistance detection electricity
Road, capacitance C1, resistance R1, resistance R2, capacitance C2, capacitance C3 and sampling control circuit；
Liquid level equivalent resistance detection circuit acquires liquid level equivalent resistance, liquid level equivalent resistance detection circuit using two electrodes
Detection signal output end connect with one end of capacitance C1, one end of the other end of capacitance C1 and one end and resistance R2 of resistance R1
It connecting simultaneously, the other end of resistance R1 is connect simultaneously with the square-wave signal output end of one end of capacitance C2 and sampling control circuit,
Another termination power supply of capacitance C2, the other end of resistance R2 and the simulation of one end of capacitance C3 and sampling control circuit are believed
Number input terminal connects simultaneously, another termination power supply of capacitance C3；
Sampling control circuit is used for for sending square-wave signal as detection signal to liquid level equivalent resistance detection circuit
Peak-peak voltage is obtained according to the analog signal of reception, the resistance value R of equivalent liquid level resistance is determined according to peak-peak voltageS, into
And obtain liquid level.
Preferably, the detection circuit further includes warning circuit, and the sampling control circuit is additionally operable to according to resistance value RS
Determine whether that warning circuit sends alarm signal：
As resistance value RSWhen more than alarm threshold value, alarm signal is sent；
As resistance value RSWhen less than secure threshold, stop sending alarm signal.
Above-mentioned technical characteristic may be combined in various suitable ways or be substituted by equivalent technical characteristic, as long as can reach
To the purpose of this utility model.
The beneficial effects of the utility model are that the utility model is used in liquid level resistance equivalent using electrode detection
Square-wave signal triggers liquid level equivalent resistance detection circuit and acquires liquid level equivalent resistance, alleviates electrode polarization, and it is accurate to improve measurement
True property, while the utility model is simple in structure, it is at low cost.
Description of the drawings
Fig. 1 is the electrical structure schematic diagram of specific embodiment of the present invention；
Fig. 2 is the square-wave signal of sampling control circuit output.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model
It limits.
Embodiment is described with reference to Fig. 1, the electric pole type liquid level detection circuit of the utility model described in present embodiment,
Including liquid level equivalent resistance detection circuit, capacitance C1, resistance R1, resistance R2, capacitance C2, capacitance C3 and sampling control circuit；
The capacitance of the capacitance C1 of present embodiment is 0.1 μ F, and the resistance value of resistance R1 is 68K Ω.The resistance of resistance R2
Value is 47K Ω, and the capacitance of capacitance C2 is 0.1 μ F, and the capacitance of capacitance C3 is 0.1 μ F；
Liquid level equivalent resistance detection circuit acquires liquid level equivalent resistance, liquid level equivalent resistance detection circuit using two electrodes
Detection signal output end connect with one end of capacitance C1, one end of the other end of capacitance C1 and one end and resistance R2 of resistance R1
It connecting simultaneously, the other end of resistance R1 is connect simultaneously with the square-wave signal output end of one end of capacitance C2 and sampling control circuit,
The square-wave signal of present embodiment is as shown in Fig. 2, another termination power supply of capacitance C2, the other end and capacitance of resistance R2
One end of C3 and the input end of analog signal of sampling control circuit connect simultaneously, another termination power supply of capacitance C3；
The liquid level equivalent resistance detection circuit of present embodiment is two electrodes in the liquid container equipped with water, sampling
The square-wave signal of control circuit output makes to be connected between two electrodes, and the resistance between two electrodes can become with liquid
Change, i.e.,：Liquid level equivalent resistance RS；
Sampling control circuit is used for for sending square-wave signal as detection signal to liquid level equivalent resistance detection circuit
Peak-peak voltage is obtained according to the analog signal of reception, the resistance value R of equivalent liquid level resistance is determined according to peak-peak voltageS, into
And obtain liquid level.
The sampling control circuit actual measurement AD sampling pin peak-peak voltages of present embodiment are as follows：
| Resistance of sensor (Ω) | 100K | 65K | 31K | 0 |
| Peak-peak voltage (V) | 3.16 | 2.76 | 1.9 | 1.08 |
Present embodiment acquires peak-peak voltage by sampling control circuit, according to the correspondence of the voltage and resistance value,
Rs resistance values are determined, to measure liquid level.
The each resistance and capacitance parameter of present embodiment can be adjusted according to actual needs, simple and reliable, cost
It is low.With wide application prospect.
In preferred embodiment, the detection circuit of present embodiment further includes warning circuit, and the sampling control circuit is also used
According to resistance value RSDetermine whether that warning circuit sends alarm signal：
As resistance value RSWhen more than alarm threshold value, alarm signal is sent；
As resistance value RSWhen less than secure threshold, stop sending alarm signal.
Alarm threshold value is 65K Ω, and secure threshold is 31K Ω, i.e.,：As resistance value RSWhen more than 65K Ω, alarm signal is sent；
As resistance value RSWhen less than 31K Ω, stop sending alarm signal.
Although describing the utility model herein with reference to specific embodiment, it should be understood that, this
A little embodiments are only the principles of the present invention and the example of application.It should therefore be understood that can be to illustrative real
It applies example and carries out many modifications, and can be designed that other arrangements, without departing from this reality as defined in the appended claims
With novel spirit and scope.It should be understood that can be combined by being different from mode described in original claim
Different dependent claims and feature described herein.It will also be appreciated that special in conjunction with described in separate embodiments
Sign can use in other embodiments.
Claims (2)
1. a kind of electric pole type liquid level detection circuit, which is characterized in that the liquid level detection circuit includes the detection of liquid level equivalent resistance
Circuit, capacitance C1, resistance R1, resistance R2, capacitance C2, capacitance C3 and sampling control circuit；
Liquid level equivalent resistance detection circuit acquires liquid level equivalent resistance, the inspection of liquid level equivalent resistance detection circuit using two electrodes
It surveys signal output end to connect with one end of capacitance C1, the other end of capacitance C1 and one end of resistance R1 and one end of resistance R2 are simultaneously
Connection, the other end of resistance R1 are connect simultaneously with the square-wave signal output end of one end of capacitance C2 and sampling control circuit, capacitance
Another termination power supply of C2, the other end of resistance R2 and one end of capacitance C3 and the analog signal of sampling control circuit are defeated
Enter end while connecting, another termination power supply of capacitance C3；
Sampling control circuit is used for basis for sending square-wave signal as detection signal to liquid level equivalent resistance detection circuit
The analog signal of reception obtains peak-peak voltage, and the resistance value R of equivalent liquid level resistance is determined according to peak-peak voltageS, and then obtain
Obtain liquid level.
2. electric pole type liquid level detection circuit according to claim 1, which is characterized in that the detection circuit further includes alarm
Circuit, the sampling control circuit are additionally operable to according to resistance value RSDetermine whether that warning circuit sends alarm signal：
As resistance value RSWhen more than alarm threshold value, alarm signal is sent；
As resistance value RSWhen less than secure threshold, stop sending alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820532862.2U CN208012706U (en) | 2018-04-13 | 2018-04-13 | Electric pole type liquid level detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820532862.2U CN208012706U (en) | 2018-04-13 | 2018-04-13 | Electric pole type liquid level detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208012706U true CN208012706U (en) | 2018-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820532862.2U Active CN208012706U (en) | 2018-04-13 | 2018-04-13 | Electric pole type liquid level detection circuit |
Country Status (1)
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| CN (1) | CN208012706U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414050A (en) * | 2018-04-13 | 2018-08-17 | 航天科技控股集团股份有限公司 | Electric pole type liquid level detection circuit |
-
2018
- 2018-04-13 CN CN201820532862.2U patent/CN208012706U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414050A (en) * | 2018-04-13 | 2018-08-17 | 航天科技控股集团股份有限公司 | Electric pole type liquid level detection circuit |
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