CN209326738U - A kind of liquid level detection circuit - Google Patents
A kind of liquid level detection circuit Download PDFInfo
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- CN209326738U CN209326738U CN201821897941.XU CN201821897941U CN209326738U CN 209326738 U CN209326738 U CN 209326738U CN 201821897941 U CN201821897941 U CN 201821897941U CN 209326738 U CN209326738 U CN 209326738U
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Abstract
The utility model relates to Technology of Level Detection fields, more particularly to a kind of liquid level detection circuit, which includes: the first bridge arm circuit, including first node, first bridge arm circuit is used for the input in response to the first level signal, and the current potential where first node is biased to the first current potential；Second bridge arm circuit, including second node, second bridge arm circuit is used for the input in response to second electrical level signal, current potential where second node is biased to the second current potential, wherein, first level signal is different from the multilevel type periodic synchronous of second electrical level signal, and the first current potential is different from the polarity of voltage periodic synchronous of the second current potential.By above-mentioned liquid level detection circuit, it can be avoided electrode corrosion, avoid deposit attachment on the electrode, to extend the service life of product.
Description
Technical field
The utility model relates to Technology of Level Detection fields, more particularly to a kind of liquid level detection circuit.
Background technique
Some instrument and equipments need sensed water level height, such as humidifier, fumigating machine, ice machine, coffee machine etc., pass through
Sensed water level height is to judge whether water tank or container store dampening.In application process, due to water tank or container water shortage, to lead
It causes product function exception or safety accident occurs.
In order to detect the height of water level of water tank or container, traditional technology uses electrode detection method sensed water level height, example
Such as, two metal electrodes are embedded in water tank by traditional technology, judge whether two metal electrodes are connected using the electric conductivity of water, if leading
It is logical, then detect water tank storage dampening.If not turning on, water tank lacks water is detected.
Inventor in the implementation of the present invention, has found traditional technology the prior art has at least the following problems: due to being applied to two
The polarity of voltage of a metal electrode be it is sustained, cause in water dirt or ionization object to be easy to be deposited on metal electrode, from
And influence the service life of metal electrode.
Utility model content
One purpose of the utility model embodiment is intended to provide a kind of liquid level detection circuit, can periodically provide change
Change current potential.
In order to solve the above technical problems, the utility model embodiment the following technical schemes are provided:
The utility model embodiment provides a kind of liquid level detection circuit, comprising:
First bridge arm circuit, including first node, first bridge arm circuit are used in response to the defeated of the first level signal
Enter, the current potential where the first node is biased to the first current potential；
Second bridge arm circuit, including second node, second bridge arm circuit are used in response to the defeated of second electrical level signal
Enter, the current potential where the second node is biased to the second current potential, wherein first level signal and the second electrical level
The multilevel type periodic synchronous of signal is different, and the polarity of voltage periodic synchronous of first current potential and second current potential is not
Together.
Optionally, the liquid level detection circuit further includes controller, the controller be connected to the first node or
The second node, for acquiring the voltage of the first node or the second node, and according to the voltage detecting liquid of acquisition
Position height.
Optionally, the liquid level detection circuit,
Under the premise of first level signal is high level, the second electrical level signal is low level；
Under the premise of first level signal is low level, the second electrical level signal is high level.
Optionally, the liquid level detection circuit,
Under the premise of first current potential is positive voltage, second current potential is no-voltage；
Under the premise of first current potential is no-voltage, second current potential is positive voltage.
Optionally, the liquid level detection circuit, first bridge arm circuit include:
First switch circuit, including first switch input terminal, first switch output end and first switch control terminal, described
One switch input terminal is for being applied external voltage, and the first switch control terminal is for inputting first level signal；
Second switch circuit, including second switch input terminal, second switch output end and second switch control terminal, described
Two switch input terminals and the first switch output end are all connected to the first node, and the second switch control terminal is for defeated
Enter first level signal；
Wherein, when first level signal is high level, first current potential is no-voltage；In first electricity
When ordinary mail number is low level, first current potential is positive voltage.
Optionally, the liquid level detection circuit,
The first switch circuit include the first PMOS tube, first resistor, second resistance and 3rd resistor, described first
The drain electrode of PMOS tube and described first resistor one end are all used to be applied the external voltage, the grid point of first PMOS tube
It is not connect with the first resistor other end and described second resistance one end, the second resistance other end is for inputting described the
One level signal, the source electrode of first PMOS tube are connect with described 3rd resistor one end, the 3rd resistor other end connection
To the first node；
The second switch circuit includes the first NMOS tube and the 4th resistance, and the drain electrode of first NMOS tube is connected to institute
First node is stated, the grid of first NMOS tube is connect with described 4th resistance one end, and the 4th resistance other end is used for
Input first level signal, the source electrode ground connection of first NMOS tube.
Optionally, the liquid level detection circuit, second bridge arm circuit include:
Third switching circuit, including third switch input terminal, third output switching terminal and third switch control terminal, described
Three switch input terminals are for being applied external voltage, and the third switch control terminal is for inputting the second electrical level signal；
4th switching circuit, including the 4th switch input terminal, the 4th output switching terminal and the 4th switch control terminal, described
Four switch input terminals and the third output switching terminal are all connected to the second node, and the 4th switch control terminal is for defeated
Enter the second electrical level signal；
Wherein, when the second electrical level signal is high level, the current potential of the second node is no-voltage；Described
When two level signals are low level, the current potential of the second node is positive voltage.
Optionally, the liquid level detection circuit,
The third switching circuit include the second PMOS tube, the 5th resistance, the 6th resistance and the 7th resistance, described second
The drain electrode of PMOS tube and described 5th resistance one end are all used to be applied the external voltage, the grid point of second PMOS tube
It is not connect with the 5th resistance other end and described 6th resistance one end, the 6th resistance other end is for inputting described the
Two level signals, the source electrode of second PMOS tube are connect with described 7th resistance one end, the 7th resistance other end connection
To the second node；
4th switching circuit includes the second NMOS tube and the 8th resistance, and the drain electrode of second NMOS tube is connected to institute
Second node is stated, the grid of second NMOS tube is connect with described 8th resistance one end, and the 8th resistance other end is used for
Input the second electrical level signal, the source electrode ground connection of second NMOS tube.
Optionally, the liquid level detection circuit further includes electrode, the electrode be connected to the first node with it is described
Between second node.
Optionally, the liquid level detection circuit further includes temperature sensor, and the temperature sensor is connected to described
Between one node and the second node.
The beneficial effects of the utility model are: compared with prior art, the first bridge arm circuit is believed in response to the first level
Number input, the current potential where first node is biased to the first current potential；Second bridge arm circuit is in response to second electrical level signal
Input, is biased to the second current potential for the current potential where second node, wherein the level of the first level signal and second electrical level signal
Type periodic synchronous is different, and the first current potential is different from the polarity of voltage periodic synchronous of the second current potential.Therefore, work as level sensing
When circuit connection top electrode, by the first level signal of mechanical periodicity and the effect of second electrical level signal, electricity can be avoided
The phenomenon that pole burn into deposit is adhered on the electrode, to extend the service life of electrode.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of theory structure block diagram of liquid level detection circuit provided by the embodiment of the utility model；
Fig. 1 a is a kind of theory structure block diagram of fluid temperature monitoring circuit provided by the embodiment of the utility model；
Fig. 2 is the structural block diagram of the first bridge arm circuit provided by the embodiment of the utility model；
Fig. 3 is the structure block diagram of the second bridge arm circuit provided by the embodiment of the utility model；
Fig. 4 is a kind of concrete structure schematic diagram of liquid level detection circuit provided by the embodiment of the utility model.
Specific embodiment
The application in order to facilitate understanding with reference to the accompanying drawings and detailed description carries out in more detail the application
It is bright.It should be noted that be expressed " being fixed on " another element when element, it can directly on the other element or
There may be one or more elements placed in the middle therebetween.When an element is expressed " connection " another element, it be can be directly
It is connected to another element in succession or there may be one or more elements placed in the middle therebetween.Term used in this specification
The orientation or position of the instructions such as "vertical", "horizontal", "left" and "right", "upper", "lower", "inner", "outside", " middle part ", " tail portion "
Setting relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description the application and simplifies description, rather than
The device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot
It is interpreted as the limitation to the application.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or imply relative importance.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Term used in the description of the utility model is intended merely to
The purpose for describing specific embodiment is not intended to limitation the utility model.Term "and/or" packet used in this specification
Include any and all combinations of one or more related listed items.In addition, the application disclosed below is different real
Applying technical characteristic involved in example can be combined with each other as long as they do not conflict with each other.
Some instrument and equipments need sensed water level height, such as humidifier, fumigating machine, ice machine, coffee machine etc., pass through
Sensed water level height is to judge whether water tank or container store dampening.In application process, due to water tank or container water shortage, to lead
It causes product function exception or safety accident occurs.In order to detect the height of water level of water tank or container, traditional technology uses electrode
Detection method sensed water level height, traditional technology are usually that two metal electrodes are embedded in water tank, are judged using the electric conductivity of water
Whether two metal electrodes are connected, if conducting, detect water tank storage dampening.If not turning on, water tank lacks water is detected.
But due to the polarity of voltage in the conventional technology, being applied to two metal electrodes be it is sustained, cause in water
Dirt or ionization object are easy to be deposited on metal electrode, to influence the service life of metal electrode.To solve drawbacks described above, this
Utility model embodiment proposes a kind of liquid level detection circuit.
Referring to Fig. 1, the liquid level detection circuit 100 includes the first bridge arm circuit 10, the second bridge arm circuit 20 and electricity
Pole 30.Electrode 30 is connected between first node 40 and second node 50.
In the present embodiment, the first bridge arm circuit 10 is used for the input in response to the first level signal, first node 40
The current potential at place is biased to the first current potential.Second bridge arm circuit 20 is used for the input in response to second electrical level signal, the second section
Current potential where point 50 is biased to the second current potential.The electricity of the first level signal and second electrical level signal that input in the present embodiment
Flat type periodic synchronous is different, and the polarity of voltage periodic synchronous of the first current potential and the second current potential is also different, for example, the first electricity
Ordinary mail number is high level, and when second electrical level signal is low level, the first current potential is no-voltage, and the second current potential is positive voltage.First
Level signal is low level, and when second electrical level signal is high level, the first current potential is positive voltage, and the second current potential is no-voltage.
When liquid level detection circuit connects top electrode, pass through the first level signal and the second electrical level signal of mechanical periodicity
The phenomenon that acting on, can be avoided electrode corrosion, deposit attachment on the electrode, to extend the service life of electrode.
In some embodiments, liquid level circuit 100 further includes controller (not shown), and controller is used for according to logic of propositions
Export the first level signal and second electrical level signal respectively, also, controller is also used to acquire first node and second node
Voltage, the voltage detecting liquid level acquired according to it.It is understood that controller is integrated with digital-to-analogue conversion interface and modulus
Translation interface can distinguish collection voltages in first node and second node by analog-to-digital conversion interface.
It should be noted that in the utility model embodiment controller with no restrictions, for example, controller can be general
Processor, digital signal processor (DSP), specific integrated circuit (ASIC), field programmable gate array (FPGA), single-chip microcontroller,
ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware component
Or any combination of these components.In addition, controller can also be any conventional processors, controller, microcontroller or shape
State machine.Controller also may be implemented as calculating the combination of equipment, for example, the combination of DSP and microprocessor, multiple micro processs
Device, one or more microprocessors combination DSP core or any other this configuration.
In order to guarantee the first level signal difference synchronous with the multilevel type of second electrical level signal, implement in the utility model
Using the first and second following level signal input modes in example:
When the first level signal is high level, then second electrical level signal is low level；When the first level signal is low electricity
Usually, then second electrical level signal is high level.
Under the premise of the first current potential of 10 first node 40 of bridge arm circuit is positive voltage, 20 second section of the second bridge arm circuit
Second current potential of point 50 is no-voltage.Under the premise of the first current potential of 10 first node 40 of bridge arm circuit is no-voltage, second
Second current potential of 20 second node 50 of bridge arm circuit is positive voltage.
When the input of the first level signal is low level, while the input of second electrical level signal is high level, the first current potential is
Positive voltage, the second current potential are no-voltage.It is high level when the first level signal inputs, while the input of second electrical level signal is low electricity
Usually, the first current potential is no-voltage, and the second current potential is positive voltage, so that the application of positive counter potential is realized in electrode 30, to keep away
Exempt from electrode corrosion, avoid deposit attachment on the electrode, to extend the service life of product.
In above-mentioned each embodiment, electrode can be omitted, or be replaced, for example, in some embodiments, liquid level
Detection circuit further includes temperature sensor, and electrode is replaced by temperature sensor, please refers to Fig. 1 a, and temperature sensor 60 is connected to
Between one node 40 and second node 50, temperature sensor 60 is for acquiring fluid temperature.When temperature sensor 60 and controller
When connection, fluid temperature is sent to controller by temperature sensor 60, so that controller monitoring fluid temperature.
In some embodiments, referring to Fig. 2, the first bridge arm circuit 10 includes first switch circuit 101 and second switch
Circuit 102, first switch circuit 101 are connected with second switch circuit 102.
It should be understood that having first switch input terminal, first switch output end and first switch in first switch circuit 101
Control terminal, first switch input terminal is for applying external voltage, and first switch control terminal is for inputting the first level signal.
It should be understood that second switch circuit 102 has second switch input terminal, second switch output end and second switch control
End processed, second switch input terminal and first switch output end are all connected to first node 40, and second switch control terminal is for inputting
First level signal.
It is worth noting that the first current potential is no-voltage when the first level signal is high level；When the first level signal
When for low level, the first current potential is positive voltage.
Referring to Fig. 3, the second bridge arm circuit 20 includes third switching circuit 201 and the 4th switching circuit 202, third switch
Circuit 201 is connected with the 4th switching circuit 202.
It should be understood that in the present embodiment, third switching circuit 201 has third switch input terminal, third switch output
End and third switch control terminal, third switch input terminal is for being applied external voltage, and third switch control terminal is for inputting institute
State second electrical level signal.
It should be understood that the 4th switching circuit 202 has the 4th switch input terminal, the 4th output switching terminal and the 4th switch control
End processed, the 4th switch input terminal and third output switching terminal are all connected to second node 50, and the 4th switch control terminal is for inputting
Second electrical level signal；
It is worth noting that the current potential of second node is no-voltage when second electrical level signal is high level；When the second electricity
When ordinary mail number is low level, the current potential of second node is positive voltage.
In order to better understand the utility model embodiment, the utility model reality is illustrated below with reference to specific circuit diagram
Example is applied, Fig. 4 is please referred to:
First PMOS tube Q1, the first NMOS tube Q3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance
R4, electrode CN1, the second PMOS tube Q2, the second NMOS tube Q4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th electricity
It hinders R8, the 9th resistance R9 and forms H-bridge circuit.H-bridge circuit in the utility model embodiment is a typical case in circuit field
DC motor control circuit because its circuitry shapes exactly like alphabetical H, thus gain the name with " H bridge ".Its 4 triode composition H's
4 vertical legs, and motor is exactly the whippletree in H.Since electrode test water level needs to provide friendship in the utility model embodiment
Stream signal just not will lead to other inorganic matters in electrolysis water and water, just can guarantee that electrode is not corroded and ionizes in this way
Sediment is deposited on surface, so using H bridge structural circuit, ensure in this way electrode can all be applied periodically one it is positive and negative
Current potential.
Wherein, first switch circuit 101 includes the first PMOS tube Q1, first resistor R1, second resistance R2 and 3rd resistor
The drain electrode of R3, the first PMOS tube Q1 and the one end the first resistor R1 are all used to be applied external voltage, the grid of the first PMOS tube
Pole is connect with the first resistor R1 other end and the one end second resistance R2 respectively, and the second resistance R2 other end is for inputting the first level
The source electrode of signal I/O1, first PMOS tube are connect with the one end 3rd resistor R3, and the 3rd resistor R3 other end is connected to described
First node 40.
Second switch circuit 102 includes the first NMOS tube Q3 and the 4th resistance R4, and the drain electrode of the first NMOS tube Q3 is connected to
The grid of the first node 40, the first NMOS tube Q3 is connect with the one end the 4th resistance R4, and the 4th resistance R4 is another
End is for inputting the first level signal I/O1, the source electrode ground connection of the first NMOS tube Q3.
Wherein, third switching circuit 103 includes the second PMOS tube Q2, the 5th resistance R5, the 6th resistance R6 and the 7th resistance
R7, the drain electrode of the second PMOS tube Q2 and the 5th one end resistance R5 are all used to be applied external voltage, the grid of the second PMOS tube Q2
It is connect respectively with the 5th resistance R5 other end and the 6th one end resistance R6, the 6th resistance R6 other end is for inputting second electrical level letter
Number I/O2, the source electrode of the second PMOS tube Q2 are connect with the 7th one end resistance R7, and the 7th resistance R7 other end is connected to second node
50。
4th switching circuit 104 includes the second NMOS tube Q4 and the 8th resistance R8, and the drain electrode of the second NMOS tube Q4 is connected to
Second node 50, the grid of the second NMOS tube Q4 are connect with the 8th one end resistance R8, and the 8th resistance R8 other end is for inputting the
The source electrode of two level signal I/O2, the second NMOS tube Q4 is grounded.
For example, liquid level detection circuit shown in Fig. 4 is specifically applied in coffee maker circuit control system, when needing to measure
When bipolar electrode CN1 water level, CN1 connects electrode, and when I/O1 input low level, I/O2 input high level, the first PMOS tube Q1 is led
Logical, the second NMOS tube Q4 conducting, CN1-1 foot is GND, is VCC on CN1-2 foot.Conversely, working as I/O1 input high level, I/O2 is defeated
When entering low level, the first NMOS tube Q3 conducting, the second PMOS tube Q2 conducting, it is GND on CN1-2 foot that CN1-1 foot, which is VCC, thus
Realize that positive counter potential is applied on the electrode of CN1, after a cycle, I/O2 exports low level, I/O1 exports high level, makes electrode
Then upper concatenation R7 electric resistance partial pressure reads A/D value, judged in coffee machine according to A/D value whether water shortage.
It is worth noting that: the CN1 in the utility model embodiment can also meet NTC (Negative Temperature
CoeffiCient) sensor, the fixed output high level of I/O1, the fixed output low level of I/O2, such temperature sensor NTC are logical
R7 partial pressure is crossed, by reading A/D value come the temperature for finding out measurement coffee of tabling look-up.
The utility model embodiment, which provides a kind of liquid level detection circuit, can be used for the household appliances of any level sensing,
It can be avoided electrode corrosion, avoid deposit attachment on the electrode, so that the service life of product is extended, additionally, due to this liquid
Position detection circuit, to reduce the diversity of manufacturer's control panel, can save production cost with temperature collection.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments,
Step can be realized with random order, and there are many other variations of the different aspect of the utility model as described above, be
Simplicity, they do not provide in details；Although the utility model is described in detail with reference to the foregoing embodiments, this
The those of ordinary skill in field it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments,
Or equivalent replacement of some of the technical features；And these are modified or replaceed, and do not make the sheet of corresponding technical solution
Matter is detached from the range of each embodiment technical solution of the application.
Claims (10)
1. a kind of liquid level detection circuit characterized by comprising
First bridge arm circuit, including first node, first bridge arm circuit are used for the input in response to the first level signal, will
Current potential where the first node is biased to the first current potential；
Second bridge arm circuit, including second node, second bridge arm circuit are used for the input in response to second electrical level signal, will
Current potential where the second node is biased to the second current potential, wherein first level signal and the second electrical level signal
Multilevel type periodic synchronous it is different, first current potential is different from the polarity of voltage periodic synchronous of second current potential.
2. liquid level detection circuit according to claim 1, which is characterized in that it further include controller, the controller connection
To the first node or the second node, for acquiring the voltage of the first node or the second node, and according to
The voltage detecting liquid level of acquisition.
3. liquid level detection circuit according to claim 1, which is characterized in that
Under the premise of first level signal is high level, the second electrical level signal is low level；
Under the premise of first level signal is low level, the second electrical level signal is high level.
4. liquid level detection circuit according to claim 1, which is characterized in that
Under the premise of first current potential is positive voltage, second current potential is no-voltage；
Under the premise of first current potential is no-voltage, second current potential is positive voltage.
5. liquid level detection circuit according to claim 1, which is characterized in that first bridge arm circuit includes:
First switch circuit, including first switch input terminal, first switch output end and first switch control terminal, described first opens
Input terminal is closed for being applied external voltage, the first switch control terminal is for inputting first level signal；
Second switch circuit, including second switch input terminal, second switch output end and second switch control terminal, described second opens
It closes input terminal and the first switch output end is all connected to the first node, the second switch control terminal is for inputting institute
State the first level signal；
Wherein, when first level signal is high level, first current potential is no-voltage；In first level signal
When for low level, first current potential is positive voltage.
6. liquid level detection circuit according to claim 5, which is characterized in that
The first switch circuit includes the first PMOS tube, first resistor, second resistance and 3rd resistor, first PMOS tube
Drain electrode and described first resistor one end be all used to be applied the external voltage, the grid of first PMOS tube respectively with institute
It states the first resistor other end to connect with described second resistance one end, the second resistance other end is for inputting first level
Signal, the source electrode of first PMOS tube are connect with described 3rd resistor one end, and the 3rd resistor other end is connected to described
First node；
The second switch circuit includes the first NMOS tube and the 4th resistance, and the drain electrode of first NMOS tube is connected to described the
One node, the grid of first NMOS tube are connect with described 4th resistance one end, and the 4th resistance other end is for inputting
First level signal, the source electrode ground connection of first NMOS tube.
7. liquid level detection circuit according to claim 1, which is characterized in that second bridge arm circuit includes:
Third switching circuit, including third switch input terminal, third output switching terminal and third switch control terminal, the third are opened
Input terminal is closed for being applied external voltage, the third switch control terminal is for inputting the second electrical level signal；
4th switching circuit, including the 4th switch input terminal, the 4th output switching terminal and the 4th switch control terminal, the described 4th opens
It closes input terminal and the third output switching terminal is all connected to the second node, the 4th switch control terminal is for inputting institute
State second electrical level signal；
Wherein, when the second electrical level signal is high level, the current potential of the second node is no-voltage；In second electricity
When ordinary mail number is low level, the current potential of the second node is positive voltage.
8. liquid level detection circuit according to claim 7, which is characterized in that
The third switching circuit includes the second PMOS tube, the 5th resistance, the 6th resistance and the 7th resistance, second PMOS tube
Drain electrode and described 5th resistance one end be all used to be applied the external voltage, the grid of second PMOS tube respectively with institute
It states the 5th resistance other end to connect with described 6th resistance one end, the 6th resistance other end is for inputting the second electrical level
Signal, the source electrode of second PMOS tube are connect with described 7th resistance one end, and the 7th resistance other end is connected to described
Second node；
4th switching circuit includes the second NMOS tube and the 8th resistance, and the drain electrode of second NMOS tube is connected to described the
Two nodes, the grid of second NMOS tube are connect with described 8th resistance one end, and the 8th resistance other end is for inputting
The second electrical level signal, the source electrode ground connection of second NMOS tube.
9. liquid level detection circuit according to any one of claims 1 to 8, which is characterized in that it further include electrode, the electrode
It is connected between the first node and the second node.
10. liquid level detection circuit according to any one of claims 1 to 8, which is characterized in that it further include temperature sensor,
The temperature sensor is connected between the first node and the second node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821897941.XU CN209326738U (en) | 2018-11-16 | 2018-11-16 | A kind of liquid level detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821897941.XU CN209326738U (en) | 2018-11-16 | 2018-11-16 | A kind of liquid level detection circuit |
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| CN209326738U true CN209326738U (en) | 2019-08-30 |
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| CN201821897941.XU Active CN209326738U (en) | 2018-11-16 | 2018-11-16 | A kind of liquid level detection circuit |
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