CN216645509U - Liquid level detection circuit and liquid level detection system - Google Patents
Liquid level detection circuit and liquid level detection system Download PDFInfo
- Publication number
- CN216645509U CN216645509U CN202122803632.XU CN202122803632U CN216645509U CN 216645509 U CN216645509 U CN 216645509U CN 202122803632 U CN202122803632 U CN 202122803632U CN 216645509 U CN216645509 U CN 216645509U
- Authority
- CN
- China
- Prior art keywords
- liquid level
- voltage
- comparison
- preset
- detection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a liquid level detection circuit and a liquid level detection system. This liquid level detection circuit includes: the detection module is arranged at a preset liquid level in a containing cavity of the container to be detected, and is used for outputting a first comparison voltage under the condition that conductive liquid in the containing cavity is lower than the preset liquid level and outputting a second comparison voltage under the condition that the conductive liquid is higher than the preset liquid level; the comparison module is connected with the detection module, is configured with a reference voltage, and is used for comparing the reference voltage with the output voltage of the detection module and outputting a comparison result, wherein the comparison result is used for indicating whether the liquid level of the conductive liquid reaches a preset liquid level. The liquid level detection circuit can reduce the cost required by liquid level height detection. The liquid level detection system comprises the liquid level detection circuit.
Description
Technical Field
The utility model relates to the technical field of liquid level detection, in particular to a liquid level detection circuit and a liquid level detection system.
Background
In some scenarios, it is desirable to detect the level of liquid within the container, for example within the washing chamber of a washing machine. At present, the liquid level height is mainly detected by a capacitive liquid level sensor.
However, the cost required to detect the liquid level height by a capacitive level sensor is high.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need for a liquid level detection circuit and a liquid level detection system that can reduce the cost required for detecting the height of a liquid level.
A liquid level detection circuit comprising:
a power supply;
the detection module is used for being arranged at a preset liquid level in a containing cavity of a container to be detected, so as to output a first comparison voltage under the condition that conductive liquid in the containing cavity is lower than the preset liquid level and output a second comparison voltage under the condition that the conductive liquid is higher than the preset liquid level;
the comparison module is connected with the detection module and is configured with a reference voltage, and the comparison module is used for comparing the reference voltage with the output voltage of the detection module and outputting a comparison result which is used for indicating whether the liquid level of the conductive liquid reaches the preset liquid level or not;
wherein one of the first comparison voltage and the second comparison voltage is greater than the reference voltage, and the other is less than the reference voltage.
In one embodiment, the detection module comprises:
the contact unit is used for being arranged at a preset liquid level in a containing cavity of a container to be detected so as to be in contact with the conductive liquid under the condition that the conductive liquid is higher than the preset liquid level;
and the voltage dividing unit is connected with the contact unit and used for outputting the first comparison voltage under the condition that the conductive liquid is lower than the preset liquid level and outputting the second comparison voltage under the condition that the conductive liquid is higher than the preset liquid level.
In one embodiment, the contact unit includes:
the first contact pole piece is connected with the power supply;
the second contact pole piece is arranged in a grounding mode, and the first contact pole piece and the second contact pole piece are arranged at the preset liquid level;
the first contact pole piece and the second contact pole piece are arranged in an isolated mode under the condition that the conductive liquid is lower than the preset liquid level; and under the condition that the conductive liquid is higher than the preset liquid level, the first contact pole piece and the second contact pole piece are electrically connected through the conductive liquid.
In one embodiment, the voltage dividing unit includes:
the voltage dividing resistor is arranged on a path between the power supply and the ground and is connected with the contact unit in series, and the voltage dividing resistor is used for outputting a first comparison voltage under the condition that the conductive liquid is lower than the preset liquid level and outputting a second comparison voltage under the condition that the conductive liquid is higher than the preset liquid level.
In one embodiment, a first end of the divider resistor is connected to the power supply, and a second end of the divider resistor is connected to the first contact pole piece and the comparison module, respectively.
In one embodiment, a first end of the voltage dividing resistor is respectively connected with the second contact pole piece and the comparison module, and a second end of the voltage dividing resistor is grounded.
In one embodiment, the comparison module comprises:
the comparator comprises a power supply end, a positive input end, a negative input end and a comparison output end, wherein the power supply end is used for receiving power supply voltage, one end of the positive input end and the negative input end is used for receiving reference voltage, the other end of the positive input end and the negative input end is connected with the divider resistor, and the comparator is used for comparing the reference voltage with the output voltage of the divider resistor and outputting the comparison result through the comparison output end.
In one embodiment, the comparing module further comprises:
and a first end of the pull-up resistor is connected with the power supply end, a second end of the pull-up resistor is connected with the comparison output end, and the pull-up resistor is used for stabilizing the output voltage of the comparator.
In one embodiment, the detection circuit further comprises:
a circuit board, wherein the power supply, the detection module and the comparison module are integrated on the circuit board.
A liquid level detection system comprises at least one liquid level detection circuit.
The liquid level detection circuit comprises a power supply, a detection module and a comparison module, wherein one end of the detection module is connected with the power supply, the other end of the detection module is grounded, and the detection module is arranged at a preset liquid level in a containing cavity of a container to be detected, so that a first comparison voltage is output under the condition that conductive liquid in the containing cavity is lower than the preset liquid level, and a second comparison voltage is output under the condition that the conductive liquid is higher than the preset liquid level; the comparison module is connected with the detection module and is configured with a reference voltage, and the comparison module is used for comparing the reference voltage with the output voltage of the detection module and outputting a comparison result which is used for indicating whether the liquid level of the conductive liquid reaches the preset liquid level or not; wherein one of the first comparison voltage and the second comparison voltage is greater than the reference voltage, and the other is less than the reference voltage. Because this application realizes the detection of liquid level height through comparing the module, detects the liquid level height with capacitanc level sensor and compares, and required cost is lower, has solved and has detected the high required problem of cost of liquid level height through capacitanc level sensor, has realized reducing the required cost of detection liquid level height.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a liquid level detection circuit in one embodiment;
FIG. 2 is a schematic diagram of a liquid level detection circuit in another embodiment;
FIG. 3 is a schematic diagram of a liquid level detection circuit in another embodiment;
FIG. 4 is a schematic diagram of a liquid level detection circuit in another embodiment;
FIG. 5 is a schematic diagram of a liquid level detection circuit in another embodiment;
FIG. 6 is a schematic diagram of a liquid level detection circuit in another embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a liquid level detection circuit in an embodiment. As shown in FIG. 1, in one embodiment, the liquid level detection circuit includes a power supply 110, a detection module 120, and a comparison module 130, wherein:
one end of the detection module 120 is connected to the power supply 110, the other end of the detection module 120 is grounded, and the detection module 120 is configured to be disposed at a preset liquid level in a containing cavity of a container to be detected, so as to output a first comparison voltage when a conductive liquid in the containing cavity is lower than the preset liquid level, and output a second comparison voltage when the conductive liquid is higher than the preset liquid level; a comparison module 130 connected to the detection module 120, wherein the comparison module 130 is configured with a reference voltage, and the comparison module 130 is configured to compare the reference voltage with an output voltage of the detection module 120 and output a comparison result, and the comparison result is used to indicate whether the liquid level of the conductive liquid reaches the preset liquid level.
In the present embodiment, the power supply 110 is used to provide a power supply voltage. One of the first comparison voltage and the second comparison voltage is greater than the reference voltage, and the other is less than the reference voltage.
In particular, the liquid level detection circuit, when in use, positions the detection module 120 at a predetermined liquid level of the receiving chamber. Since the detection module 120 outputs the first comparison voltage in case that the conductive liquid is lower than the preset level, the second comparison voltage is output in case the conductive liquid is higher than the preset level, and the comparison module 130 may compare the reference voltage with the output voltage of the detection module 120, and one of the first voltage and the second voltage is greater than the reference voltage, the other of which is less than the reference voltage, corresponding to the comparison result outputted by the comparison module 130 when the conductive liquid is higher than the preset level, different from the comparison result outputted by the comparison module 130 in case that the conductive liquid is lower than the preset level, it is possible to output the comparison result according to the comparison result outputted by the comparison module 130, the outputted comparison result may be used to indicate whether the level of the conductive liquid reaches the preset level, which is equivalent to determining whether the level of the conductive liquid reaches the preset level through the comparison result outputted by the comparison module 130.
The technical scheme of this embodiment, through setting up detection module 120 at the preset liquid level department of the holding intracavity of the container of waiting to detect, make conducting liquid be less than under the condition of presetting the liquid level, and export different comparison voltage under the condition that conducting liquid is higher than the preset liquid level, then comparison module 130 can be according to the different voltages of detection module 120 output, thereby export different comparison results, be equivalent to comparison module 130 can export different comparison results under the condition that conducting liquid is less than the condition of presetting the liquid level and under the condition that is higher than the preset liquid level, then can confirm whether the liquid level of conducting liquid reaches preset liquid level through the comparison result of comparison module 130 output. Because this application can realize the detection of liquid level height through detection module 120 and comparison module 130, compare with capacitanc level sensor detects the liquid level height, required cost is lower, has solved the problem that detects the required cost of liquid level height through capacitanc level sensor higher, has realized reducing the required cost of detection liquid level height.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a liquid level detection circuit in another embodiment. As shown in fig. 2, the detection module 120 includes a contact unit 121 and a voltage dividing unit 122, wherein:
one end of the contact unit 121 is connected to the power supply 110, the other end of the contact unit 121 is grounded, and the contact unit 121 is configured to be disposed at a preset liquid level in a containing cavity of a container to be detected, so as to contact the conductive liquid when the conductive liquid is higher than the preset liquid level; the voltage dividing unit 122 is connected to the contacting unit 121, and configured to output the first comparison voltage when the conductive liquid is lower than the preset liquid level, and output the second comparison voltage when the conductive liquid is higher than the preset liquid level.
Specifically, one end of the contact unit 121 is connected to the power supply 110, the other end of the contact unit 121 is grounded, the contact unit 121 is disposed at a preset liquid level in the accommodating cavity, when the liquid level of the conductive liquid is higher than the preset liquid level, the contact unit 121 can contact the conductive liquid, a path between the power supply 110 and the ground is conducted, a conductive resistor formed by the conductive liquid generates a non-zero voltage, and the voltage dividing unit 122 divides the voltage of the liquid resistor, so as to output a second comparison voltage. When the liquid level of the conductive liquid is lower than the preset liquid level, the contact unit 121 cannot contact the conductive liquid, and the voltage dividing unit 122 outputs the first comparison voltage, so that the comparison module 130 can output the comparison result through the voltage output by the voltage dividing unit 122.
In this embodiment, the voltage dividing unit 122 is connected to the contact unit 121, so that when the contact unit 121 contacts the conductive liquid, the voltage dividing unit 122 divides the voltage of the liquid resistor of the conductive liquid to output the second comparison voltage, and divides the voltage to output the first comparison voltage when the contact unit 121 does not contact the conductive liquid.
In one embodiment, the contact unit comprises a first contact pole piece and a second contact pole piece, wherein:
the first contact pole piece is connected with the power supply; the second contact pole piece is arranged in a grounding mode, and the first contact pole piece and the second contact pole piece are arranged at the preset liquid level; under the condition that the conductive liquid is lower than the preset liquid level, the first contact pole piece and the second contact pole piece are arranged in an isolated mode; and under the condition that the conductive liquid is higher than the preset liquid level, the first contact pole piece and the second contact pole piece are electrically connected through the conductive liquid.
In this embodiment, because first contact pole piece and second contact pole piece all set up and predetermine the liquid level department, then under the condition that conducting liquid is less than predetermineeing the liquid level, first contact pole piece and second contact pole piece keep apart the setting, then first contact pole piece and second contact pole piece can't be connected, then the passageway between power supply and the ground can't switch on. And under the condition that the conductive liquid is higher than the preset liquid level, the first contact pole piece and the second contact pole piece are electrically connected through the conductive liquid, and then the passage between the power supply and the ground is conducted.
It should be noted that the first contact pole piece and the second contact pole piece in this embodiment are pole pieces that can conduct electricity.
In one embodiment, the voltage dividing unit includes a voltage dividing resistor disposed on a path between the power supply and the ground and connected in series with the contact unit, and the voltage dividing resistor is configured to output a first comparison voltage if the conductive liquid is lower than the preset liquid level and output a second comparison voltage if the conductive liquid is higher than the preset liquid level.
In this embodiment, through divider resistance in the electrically conductive liquid is less than output first comparison voltage under the condition of predetermineeing the liquid level to and the electrically conductive liquid is higher than output second comparison voltage under the condition of predetermineeing the liquid level, the volume of resistance is less, has further reduced the volume of liquid level detection circuit.
In one embodiment, a first end of the voltage-dividing resistor is connected with the power supply, and a second end of the voltage-dividing resistor is connected with the first contact pole piece and the comparison module respectively.
In one embodiment, a first end of the voltage dividing resistor is respectively connected with the second contact pole piece and the comparison module, and a second end of the voltage dividing resistor is grounded.
In one embodiment, the comparison module includes a comparator, where the comparator includes a power supply terminal, a positive input terminal, a negative input terminal, and a comparison output terminal, the power supply terminal is configured to receive a power supply voltage, one of the positive input terminal and the negative input terminal is configured to receive a reference voltage, and the other of the positive input terminal and the negative input terminal is connected to the voltage dividing resistor, and the comparator is configured to compare the reference voltage with an output voltage of the voltage dividing resistor, and output the comparison result through the comparison output terminal.
In this embodiment, the comparator compares the reference voltage with the output voltage of the voltage dividing resistor, so that the volume of the liquid level detection circuit can be further reduced.
In general, the reference voltage, the supply voltage, and the voltage dividing resistance satisfy the following relationship:
VREF — VDD × R1/(R1+ Rm); VREF is the voltage of the reference voltage, R1 is the resistance of the divider resistor, VDD is the voltage of the power supply voltage, and Rm is the liquid resistance of the conductive liquid when the conductive liquid just contacts the first contact pole piece and the second contact pole piece.
It is understood that the magnitude of Rm is related to the density, capacity, etc. of the conductive liquid.
In one embodiment, the comparison module further includes a pull-up resistor, wherein a first terminal of the pull-up resistor is connected to the power supply terminal, a second terminal of the pull-up resistor is connected to the comparison output terminal, and the pull-up resistor is configured to stabilize an output voltage of the comparator.
In this embodiment, because the output voltage of the comparator can be stabilized through the pull-up resistor, different voltages can be output when the conductive liquid is lower than the preset liquid level and when the conductive liquid is higher than the preset liquid level, the problem of error identification caused by unstable output voltage of the comparator is avoided, and the accuracy of detecting whether the conductive liquid reaches the preset liquid level is improved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a liquid level detection circuit in another embodiment. As shown in FIG. 3, in one embodiment, the liquid level detection circuit includes a power supply, a first contact pole piece 1211, a second contact pole piece 1212, a voltage divider resistor R1, a comparator U1A, and a pull-up resistor R2. Wherein:
the first end of the voltage-dividing resistor R1 is connected with the power supply, and the second end of the voltage-dividing resistor R1 is connected with the first contact pole piece 1211 and the positive input end of the comparator U1A respectively. The first contact electrode 1211 is connected to a power supply, and the second contact electrode 1212 is grounded. The negative input of comparator U1A receives a reference voltage. A first terminal of pull-up resistor R2 is connected to the supply terminal of comparator U1A, and a second terminal of pull-up resistor R2 is connected to the comparison output terminal.
In this embodiment, the voltage value VIN output by the voltage dividing resistor R1 is VDD × R3/(R1+ R3), where R3 is a liquid resistor of the conductive liquid. When VIN and VREF are compared through the comparator U1A, and when VIN is larger than VREF, the output of a comparison output end VOUT is VDD, which indicates that the conductive liquid does not reach the preset liquid level; when VIN < VREF, VOUT output is GND, indicating that the conducting liquid reaches a predetermined level.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a liquid level detection circuit in another embodiment. As shown in FIG. 4, in one embodiment, the liquid level detection circuit includes a power supply, a first contact pole piece 1211, a second contact pole piece 1212, a voltage divider resistor R1, a comparator U1A, and a pull-up resistor R2. Wherein:
the first end of the voltage-dividing resistor R1 is connected to the power supply, and the second end of the voltage-dividing resistor R1 is connected to the first contact pole 1211 and the negative input end of the comparator U1A, respectively. The first contact electrode 1211 is connected to a power supply, and the second contact electrode 1212 is grounded. The positive input of comparator U1A receives a reference voltage. A first terminal of pull-up resistor R2 is connected to the supply terminal of comparator U1A, and a second terminal of pull-up resistor R2 is connected to the comparison output terminal.
In this embodiment, the voltage value VIN output by the voltage dividing resistor R1 is VDD × R3/(R1+ R3), where R3 is a liquid resistor of the conductive liquid. VIN and VREF are compared through a comparator U1A, when VIN is larger than VREF, the output of a comparison output end VOUT is GND, and the conductive liquid does not reach the preset liquid level; when VIN < VREF, VOUT output is VDD, indicating that the conductive liquid reaches a predetermined level.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a liquid level detection circuit in another embodiment. As shown in FIG. 5, in one embodiment, the liquid level detection circuit includes a power supply, a first contact pole piece 1211, a second contact pole piece 1212, a voltage divider resistor R1, a comparator U1A, and a pull-up resistor R2. Wherein:
the first end of the divider resistor R1 is connected to the second contact pad 1212 and the positive input terminal of the comparator U1A, respectively, and the second end of the divider resistor R1 is grounded. The first contact electrode 1211 is connected to a power supply. The negative input of comparator U1A receives the reference voltage. A first terminal of pull-up resistor R2 is connected to the supply terminal of comparator U1A, and a second terminal of pull-up resistor R2 is connected to the comparison output terminal.
In this embodiment, the voltage value VIN output by the voltage dividing resistor R1 is VDD × R3/(R1+ R3), where R3 is a liquid resistor of the conductive liquid. VIN and VREF are compared through a comparator U1A, when VIN is larger than VREF, the output of a comparison output end VOUT is VDD, and the conductive liquid reaches a preset liquid level; when VIN < VREF, VOUT output is GND, indicating that the conducting liquid has not reached the predetermined level.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a liquid level detection circuit in another embodiment. As shown in FIG. 6, in one embodiment, the liquid level detection circuit includes a power supply, a first contact pole piece 1211, a second contact pole piece 1212, a voltage dividing resistor R1, a comparator U1A and a pull-up resistor R2. Wherein:
the first end of the divider resistor R1 is connected to the second contact pole piece 1212 and the negative input end of the comparator U1A, respectively, and the second end of the divider resistor R1 is grounded. The first contact electrode 1211 is connected to a power supply. The positive input of comparator U1A receives a reference voltage. A first terminal of pull-up resistor R2 is connected to the supply terminal of comparator U1A, and a second terminal of pull-up resistor R2 is connected to the comparison output terminal.
In this embodiment, the voltage value VIN output by the voltage dividing resistor R1 is VDD × R3/(R1+ R3), where R3 is a liquid resistor of the conductive liquid. VIN and VREF are compared through a comparator U1A, when VIN is larger than VREF, the output of a comparison output end VOUT is GND, and the conductive liquid reaches a preset liquid level; when VIN < VREF, VOUT output is VDD, indicating that the conductive liquid has not reached a predetermined level.
In one embodiment, the detection circuit further comprises a circuit board, wherein the power supply, the detection module and the comparison module are integrated on the circuit board.
It can be understood that the integration degree of the liquid level detection circuit can be improved by integrating the power supply, the detection module and the comparison module on the same circuit board.
It should be noted that, in the liquid level detection circuit of any of the above embodiments, the other components except the first contact pole piece and the second contact pole piece may be disposed on the same circuit board.
In one embodiment, a liquid level detection system is also provided that includes at least one liquid level detection circuit. The liquid level detection circuit of this embodiment may refer to the description of any of the above embodiments, which is not repeated herein.
In one embodiment, the liquid level detection circuit is plural, and the plural liquid level detection circuits are provided at different liquid levels.
In this embodiment, when the liquid level detection circuit is a plurality of, a plurality of liquid level detection circuit settings are in the also liquid level department of difference, and then liquid level detection system can detect the liquid level height interval of conducting liquid.
The liquid level detection circuit and the liquid level detection system can be applied to machines such as washing machines and the like which need to detect the liquid level.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A liquid level detection circuit, comprising:
a power supply;
the detection module is used for being arranged at a preset liquid level in a containing cavity of a container to be detected, so as to output a first comparison voltage under the condition that conductive liquid in the containing cavity is lower than the preset liquid level and output a second comparison voltage under the condition that the conductive liquid is higher than the preset liquid level;
the comparison module is connected with the detection module and is configured with a reference voltage, and the comparison module is used for comparing the reference voltage with the output voltage of the detection module and outputting a comparison result which is used for indicating whether the liquid level of the conductive liquid reaches the preset liquid level or not;
wherein one of the first comparison voltage and the second comparison voltage is greater than the reference voltage, and the other is less than the reference voltage.
2. The liquid level detection circuit of claim 1, wherein the detection module comprises:
the contact unit is used for being arranged at a preset liquid level in a containing cavity of a container to be detected so as to be in contact with the conductive liquid under the condition that the conductive liquid is higher than the preset liquid level;
and the voltage dividing unit is connected with the contact unit and used for outputting the first comparison voltage under the condition that the conductive liquid is lower than the preset liquid level and outputting the second comparison voltage under the condition that the conductive liquid is higher than the preset liquid level.
3. The liquid level detection circuit of claim 2, wherein the contact unit comprises:
the first contact pole piece is connected with the power supply;
the second contact pole piece is arranged in a grounding mode, and the first contact pole piece and the second contact pole piece are arranged at the preset liquid level;
the first contact pole piece and the second contact pole piece are arranged in an isolated mode under the condition that the conductive liquid is lower than the preset liquid level; and under the condition that the conductive liquid is higher than the preset liquid level, the first contact pole piece and the second contact pole piece are electrically connected through the conductive liquid.
4. The liquid level detection circuit of claim 3, wherein the voltage divider unit comprises:
the voltage dividing resistor is arranged on a path between the power supply and the ground and is connected with the contact unit in series, and the voltage dividing resistor is used for outputting a first comparison voltage under the condition that the conductive liquid is lower than the preset liquid level and outputting a second comparison voltage under the condition that the conductive liquid is higher than the preset liquid level.
5. The liquid level detection circuit of claim 4, wherein a first end of the voltage-dividing resistor is connected to the power supply, and a second end of the voltage-dividing resistor is connected to the first contact pole piece and the comparison module, respectively.
6. The liquid level detection circuit of claim 4, wherein a first end of the voltage divider resistor is connected to the second contact pole piece and the comparison module, respectively, and a second end of the voltage divider resistor is connected to ground.
7. The liquid level detection circuit of claim 4, wherein the comparison module comprises:
the comparator comprises a power supply end, a positive input end, a negative input end and a comparison output end, wherein the power supply end is used for receiving power supply voltage, one end of the positive input end and the negative input end is used for receiving reference voltage, the other end of the positive input end and the negative input end is connected with the divider resistor, and the comparator is used for comparing the reference voltage with the output voltage of the divider resistor and outputting the comparison result through the comparison output end.
8. The liquid level detection circuit of claim 7, wherein the comparison module further comprises:
and a first end of the pull-up resistor is connected with the power supply end, a second end of the pull-up resistor is connected with the comparison output end, and the pull-up resistor is used for stabilizing the output voltage of the comparator.
9. The liquid level detection circuit of any of claims 1-8, further comprising:
a circuit board, wherein the power supply, the detection module and the comparison module are integrated on the circuit board.
10. A liquid level detection system comprising at least one liquid level detection circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122803632.XU CN216645509U (en) | 2021-11-16 | 2021-11-16 | Liquid level detection circuit and liquid level detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122803632.XU CN216645509U (en) | 2021-11-16 | 2021-11-16 | Liquid level detection circuit and liquid level detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216645509U true CN216645509U (en) | 2022-05-31 |
Family
ID=81735400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122803632.XU Active CN216645509U (en) | 2021-11-16 | 2021-11-16 | Liquid level detection circuit and liquid level detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216645509U (en) |
-
2021
- 2021-11-16 CN CN202122803632.XU patent/CN216645509U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9547337B2 (en) | Portable device and peripheral extension dock | |
| CN106291210B (en) | USB interface detector, USB interface detection method, USB connector and electronic equipment | |
| US20210273462A1 (en) | Open cell detection method and open cell recovery detection method in a battery management system | |
| JP2001035542A (en) | Detection method for battery pack and mobile terminal | |
| US20150362944A1 (en) | Systems and methods for cable resistance compensation | |
| US20120153993A1 (en) | Usb port detecting circuit | |
| CN109828173B (en) | Load detection system and load detection method thereof | |
| EP3683688B1 (en) | Corrosion protection circuit for serial bus connector | |
| US20170346314A1 (en) | Battery protection board, battery and mobile terminal | |
| CN105301386B (en) | OTG detection circuit and mobile terminal with it | |
| WO2014039499A2 (en) | Method and system for voltage collapse protection | |
| US20220311065A1 (en) | Device and method for monitoring at least three battery cells of a battery | |
| US9673641B2 (en) | Voltage detecting device | |
| CN216696605U (en) | Battery temperature detection circuit | |
| CN216645509U (en) | Liquid level detection circuit and liquid level detection system | |
| JPWO2017159219A1 (en) | Management device and power supply | |
| US8872521B2 (en) | Electrical parameter detection device for peripheral component interconnect devices | |
| CN110793660A (en) | Battery temperature detection circuit | |
| US11531044B2 (en) | Battery pack, battery management system, and method therefor | |
| JP2018049726A (en) | Battery temperature monitoring system | |
| CN202649858U (en) | Overvoltage tolerance level detection circuit and system | |
| CN210694293U (en) | Bluetooth headset and temperature screening circuit therein | |
| US11797036B2 (en) | Detection and protection circuit, power supply circuit, power supply method of active device | |
| CN115333193A (en) | Charging and discharging management method and electronic equipment | |
| JPH11266542A (en) | Power source circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |