CN212082519U - Water level detection circuit, water level detector and electronic equipment - Google Patents
Water level detection circuit, water level detector and electronic equipment Download PDFInfo
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- CN212082519U CN212082519U CN202021158500.5U CN202021158500U CN212082519U CN 212082519 U CN212082519 U CN 212082519U CN 202021158500 U CN202021158500 U CN 202021158500U CN 212082519 U CN212082519 U CN 212082519U
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Abstract
The utility model provides a water level detection circuit, a water level detector and an electronic device, wherein, the water level detection circuit comprises a first probe and a second probe which are used for detecting the height of a water level; and a charge and discharge circuit connected to the first probe and the second probe; when the water level reaches the positions of the first probe and the second probe, the first probe and the second probe are communicated through the water quality equivalent resistor to trigger the charge and discharge circuit to work; in the working process of the charging and discharging circuit, the charging circuit and the discharging circuit are switched by switching the current direction, and an oscillating voltage signal is generated at the output end to indicate that the current water level reaches a set position; through the utility model discloses can change the polarity at first probe and second probe both ends for reciprocating motion can be along with the change of probe polarity to the water ion between the probe, has prolonged the life of probe, and has reduced the failure rate that water level detected, and then has improved user's use and has experienced.
Description
Technical Field
The utility model belongs to the technical field of the water level detection technique and specifically relates to a water level detection circuit, water level detector and electronic equipment are related to.
Background
The water level detection circuit is applied to a plurality of electric products with water tanks, wherein the probe type water level detection is not influenced by factors such as the shape, the material and the temperature of a tank body, has low cost and is a more mainstream water level detection circuit.
The existing water level detection mode is that a directional circuit is loaded on two water level detection probes, when water contacts the two probes, the circuit forms a loop and is conducted, and a detection circuit detects a voltage value. When no water contacts the two probes, the probes are suspended, the circuit cannot form a loop, and the electric measuring circuit cannot detect the voltage value. According to the water level detection method, the two water level detection probes are fixed in polarity, and form a directional electric field for a long time, so that the probes are easy to have the problems of probe polarization and scale formation, the service life of the probes is shortened, the failure of water level detection is easy to cause, and the use experience of a user is reduced.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a water level detection circuit, a water level detector and an electronic device, so as to alleviate the above technical problems.
In a first aspect, an embodiment of the present invention provides a water level detection circuit, wherein, this water level detection circuit includes: the first probe and the second probe are used for detecting the height of a water level; and a charge and discharge circuit connected to the first probe and the second probe; when the water level reaches the positions of the first probe and the second probe, the first probe and the second probe are communicated through the water quality equivalent resistor to trigger the charge and discharge circuit to work; the charging and discharging circuit is used for switching the charging circuit and the discharging circuit by switching the current direction in the working process, and an oscillating voltage signal is generated at the output end to indicate that the current water level reaches a set position.
In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the charging and discharging circuit includes a phase inverter and a converting circuit connected to the phase inverter, the converting circuit includes a charging capacitor, and the converting circuit is further connected to the first probe and the second probe; the inverter is used for changing the polarity of the port voltage input to the conversion circuit by the inverter when the voltage value of the charging capacitor is detected to be higher than a preset first voltage threshold value, so that the conversion circuit and the water quality equivalent resistor form a discharge circuit; the inverter is also used for changing the polarity of the port voltage input to the conversion circuit by the inverter when the voltage value of the charging capacitor is detected to be lower than a preset second voltage threshold value, so that the conversion circuit and the water quality equivalent resistor form a charging circuit; wherein the first voltage threshold is higher than the second voltage threshold.
In combination with the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the switching circuit further includes a first current-limiting resistor, a first charge-discharge resistor, and a second charge-discharge resistor; the first end of the first charge-discharge resistor and the first end of the charge capacitor are connected with the first port of the phase inverter through a first current-limiting resistor, the second end of the first charge-discharge resistor is connected with the first probe, the second end of the charge capacitor is connected with the fourth port of the phase inverter, the first end of the second charge-discharge resistor is connected with the second probe, and the second end of the second charge-discharge resistor is connected with the second port of the phase inverter; the second port of the inverter is in short circuit with the third port of the inverter, and the fourth port of the inverter is in short circuit with the fifth port of the inverter.
In a second aspect, an embodiment of the present invention further provides a water level detector, wherein the water level detector includes the above water level detection circuit, a controller and a first grounding capacitor, and an output end of the water level detection circuit is connected to a signal input end of the controller through the first grounding capacitor; the water level detection circuit is used for filtering the generated oscillation voltage signal through a first grounding capacitor and then sending the signal to the controller; the controller is used for receiving the filtered oscillation voltage signal to indicate that the current water level reaches the set position.
In combination with the second aspect, embodiments of the present invention provide a first possible implementation manner of the second aspect, wherein a capacitance value of the first ground capacitor is 0.1 microfarad.
In combination with the second aspect, an embodiment of the present invention provides a second possible implementation manner of the second aspect, wherein the water level detector further includes a switch circuit connected to both the signal output terminal of the controller and the power input terminal of the water level detection circuit; the switch circuit is used for being connected with an external power supply so as to provide electric energy for the water level detection circuit when receiving a power supply signal sent by the signal output end of the controller.
With reference to the second possible implementation manner of the second aspect, the embodiment of the present invention provides a third possible implementation manner of the second aspect, where the switch circuit includes a triode, a second current-limiting resistor, and a second ground capacitor; the emitter of the triode is used for being connected with an external power supply, the collector of the triode is connected with the signal output end of the controller through a second current-limiting resistor, and the base of the triode is connected with the power input end of the water level detection circuit through a second grounding capacitor.
In combination with the third possible implementation manner of the second aspect, the embodiment of the present invention provides a fourth possible implementation manner of the second aspect, and the resistance value of the second current limiting resistor is 4.7 kohms.
With reference to the second aspect, embodiments of the present invention provide a fifth possible implementation manner of the second aspect, wherein the water level detector further includes a display screen connected to the controller; the display screen is used for displaying the filtered oscillation voltage signal.
In a third aspect, an embodiment of the present invention provides an electronic device, wherein the electronic device includes the above-mentioned water level detector.
The embodiment of the utility model provides a following beneficial effect has been brought:
the embodiment of the utility model provides a pair of water level detection circuit, water level detector and electronic equipment, wherein, this water level detection circuit includes: the first probe and the second probe are used for detecting the height of a water level; and a charge and discharge circuit connected to the first probe and the second probe; when the water level reaches the positions of the first probe and the second probe, the first probe and the second probe are communicated through the water quality equivalent resistor to trigger the charge and discharge circuit to work; in the working process of the charging and discharging circuit, the charging circuit and the discharging circuit are switched by switching the current direction, and an oscillating voltage signal is generated at the output end to indicate that the current water level reaches a set position; and then can change the polarity at first probe and second probe both ends for water ion between the probe can be along with probe polarity's change is reciprocating motion, can effectually reduce probe ion and separate out and the absorbent problem of ion, has prolonged the life of probe, and has reduced the failure rate of water level detection, and then has improved user's use and experienced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an electric field direction;
fig. 2 is a schematic structural diagram of a water level detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an oscillating voltage signal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another water level detection circuit according to an embodiment of the present invention;
fig. 5 is a logic diagram of an inverter according to an embodiment of the present invention;
fig. 6 is a schematic circuit structure diagram of a water level detection circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a water level detector according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of another water level detector according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another water level detector according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
At present, because the two probes of the conventional probe detection circuit are fixed in polarity, a directional electric field is formed for a long time, for convenience of explanation, fig. 1 shows a structural schematic diagram of an electric field direction, as shown in fig. 1, electrolyte in water can be gathered to a negative probe for a long time, and positive ions can be separated out from metal of a positive probe, so that the positive probe is shorter and shorter along with the lapse of time, and a polarization phenomenon occurs; and the negative probe is gathered by a large amount of positive ions for a long time, and reacts with acidic ions in water to generate a compound which is adhered to the surface of the negative probe, and the scale on the surface of the negative probe is increased along with the lapse of time, so that the water level detection is invalid, and the use experience of a user is reduced.
Based on this, the embodiment of the utility model provides a pair of water level detection circuit, water level detector and electronic equipment can alleviate above-mentioned technical problem.
In order to facilitate understanding of the present embodiment, a water level detection circuit disclosed in an embodiment of the present invention is first described in detail.
The first embodiment is as follows:
the embodiment of the utility model provides a water level detection circuit, figure 2 shows a water level detection circuit's schematic structure diagram, as shown in figure 2, this water level detection circuit includes: a first probe 200 and a second probe 201 for detecting a water level height; and a charge and discharge circuit 203 connected to the first probe and the second probe; when the water level reaches the positions of the first probe 200 and the second probe 201, the first probe and the second probe are communicated through the water quality equivalent resistor to trigger the charge and discharge circuit 203 to work; the charging and discharging circuit 203 is used for switching between the charging circuit and the discharging circuit by switching the current direction during the working process, and generating an oscillating voltage signal at the output end to indicate that the current water level reaches a set position.
The first probe 200 and the second probe 201 can be made of corrosion-resistant and inert metal such as titanium metal or 316 stainless steel, and can be fixed on the wall surface of the water tank according to the requirements of users when the probe is actually used, the fixed heights of the first probe and the second probe are the same, the positions of the fixed probes are positions where the water level of the water tank needs to be detected, when the water level reaches the positions of the first probe and the second probe, because water in life has weak conductivity, when two probes apply voltage, a water quality equivalent resistor can be formed between the first probe and the second probe to communicate the first probe and the second probe.
When the first probe and the second probe are communicated, the charging and discharging circuit 203 is triggered to work, the charging and discharging circuit 203 and the water quality equivalent resistor form an RC (resistance capacitance) oscillating circuit, and the RC oscillating circuit has an oscillating characteristic, so that the charging and discharging circuit can be switched by switching a current direction, and an oscillating voltage signal is generated at an output end of the charging and discharging circuit; for convenience of explanation, fig. 3 shows a schematic diagram of a structure of an oscillating voltage signal, as shown in fig. 3, when the RC oscillating circuit is charged by a capacitor (i.e., the RC oscillating circuit is a charging circuit), the charging and discharging circuit outputs a high level signal Vb at an output terminal, when the charging of the oscillating circuit is completed and the discharging is started (i.e., the RC oscillating circuit is a discharging circuit), the charging and discharging circuit outputs a low level signal Va at an output terminal, and the oscillating circuit is cyclically charged and discharged in such a way that the oscillating voltage signal shown in fig. 3 is generated at the output terminal.
Due to the oscillation characteristics of the oscillation circuit, the polarity of the two probes can be changed while the charging circuit and the discharging circuit are switched by switching the current direction, for example, when the oscillation circuit is a charging circuit, the polarity of the first probe 200 is positive, the polarity of the second probe 201 is negative, and when the oscillation circuit is a discharging circuit, the polarity of the first probe 200 is negative, and the polarity of the second probe 201 is positive; along with charging circuit and discharge circuit's switching for the water ion between first probe and second probe can be along with probe polarity's change is reciprocating motion, thereby can effectual reduction probe ion separate out, reaches the purpose that prevents polarization, and the probe surface can't also form the incrustation scale because of the absorption of anion like this, can effectively prolong the life of probe, and has reduced water level detection's failure rate, has improved user's use experience.
The embodiment of the utility model provides an above-mentioned water level detection circuit, wherein, this water level detection circuit includes: the first probe and the second probe are used for detecting the height of a water level; and a charge and discharge circuit connected to the first probe and the second probe; when the water level reaches the positions of the first probe and the second probe, the first probe and the second probe are communicated through the water quality equivalent resistor to trigger the charge and discharge circuit to work; in the working process of the charging and discharging circuit, the charging circuit and the discharging circuit are switched by switching the current direction, and an oscillating voltage signal is generated at the output end to indicate that the current water level reaches a set position; and then can change the polarity at first probe and second probe both ends for the water ion between the probe can be along with the change of probe polarity and do reciprocating motion, has prolonged the life of probe, and has reduced the failure rate of water level detection, and then has improved user's use and experienced.
On the basis of fig. 2, fig. 4 shows a schematic structural diagram of another water level detection circuit, as shown in fig. 4, the charging and discharging circuit comprises an inverter 400, and a conversion circuit 401 connected with the inverter, the conversion circuit comprises a charging capacitor C1, wherein the conversion circuit 401 is further connected with the first probe 200 and the second probe 201; the inverter 400 is used for changing the polarity of the port voltage input to the conversion circuit by the inverter when detecting that the voltage value of the charging capacitor C1 is higher than a preset first voltage threshold value, so that the conversion circuit and the water quality equivalent resistor form a discharge circuit; the inverter 400 is further used for changing the polarity of the port voltage input to the conversion circuit by the inverter when the voltage value of the charging capacitor C1 is detected to be lower than a preset second voltage threshold value, so that the conversion circuit and the water quality equivalent resistor form a charging circuit; wherein the first voltage threshold is higher than the second voltage threshold.
The inverter is a high-speed CMOS (Complementary Metal Oxide Semiconductor) device, and is compatible with a low-power schottky TTL (Transistor-Transistor Logic) circuit, and in this embodiment, the inverter may use a 6-channel input/output inverter integrated module, or a 3-channel input/output inverter integrated module to implement voltage threshold determination and port voltage polarity conversion.
For convenience of explanation, fig. 5 shows a logic diagram of an inverter, as shown in fig. 5, wherein a denotes an input port of the inverter, Y denotes an output port of the inverter, the inverter 400 has 6 channels, each channel includes an input port, an output port, and a not gate connecting the two ports; taking the first port 1A and the second port 1Y in fig. 5 as an example to specifically illustrate the logic characteristics of the inverter, when the voltage input to the first port 1A is higher than a preset first voltage threshold, the first port 1A is at a high level, and under the action of the not gate, the second port 1Y outputs a low level at this time; when the voltage input into the first port 1A is lower than a preset second voltage threshold, the first port 1A is at a low level, and under the action of the not gate, the second port 1Y outputs a high level at the moment; the logic characteristics of the other channels of the inverter are the same as those of the first port 1A and the second port 1Y, and are not described herein again.
The first voltage threshold is generally set to be 0.8 times the external power supply voltage VDC, that is, the first voltage threshold is 0.8VDC, and the second voltage threshold is generally set to be 0.2 times the power supply voltage VDC, that is, the second voltage threshold is 0.2 VDC.
The voltage value of the charging capacitor and the preset voltage threshold are logically judged by utilizing the logical characteristics of the inverter, and the polarity of the port voltage input to the conversion circuit by the inverter is changed according to the judgment result, so that the conversion circuit and the water quality equivalent resistor form a discharging circuit or a charging circuit.
Specifically, fig. 6 shows a schematic circuit structure diagram of a water level detection circuit, the conversion circuit 401 further includes a first current limiting resistor R2, a first charge-discharge resistor R1, and a second charge-discharge resistor R3; the first end of the first charge-discharge resistor R1 and the first end of the charge capacitor C1 are connected with the first port 1A of the inverter 400 through the first current-limiting resistor R2, the second end of the first charge-discharge resistor R1 is connected with the first probe 200, the second end of the charge capacitor C1 is connected with the fourth port 2Y of the inverter 400, the first end of the second charge-discharge resistor R3 is connected with the second probe 201, and the second end of the second charge-discharge resistor R3 is connected with the second port 1Y of the inverter 400; the second port 1Y of the inverter 400 is shorted with the third port 2A of the inverter 400, and the fourth port 2Y of the inverter 400 is shorted with the fifth port 3A of the inverter 400.
As shown in fig. 6, the RC oscillating circuit is specifically composed of the second port 1Y, the fourth port 2Y, the first charge-discharge resistor R1, the second charge-discharge resistor R3, the water quality equivalent resistor Rw, and the charge capacitor C1 of the inverter 400, when the first port 1A of the inverter detects that the voltage value of the charge capacitor C1 is higher than 0.8VCC, it indicates that the charge capacitor C1 has been charged, at this time, the first port 1A is at a high level, the second port 1Y is at a low level because the first port 1A and the second port 1Y are connected by a nor, the third port 2A is also at a low level because the second port 1Y is short-circuited with the third port 2A, and the fourth port 2Y is at a high level, at this time, a discharge circuit of 2Y- > C1- > R1- > Rw- > R3- >1Y is formed, at this time, the polarity of the first probe 200 is positive, the polarity of the second probe 201 is negative.
When the first port 1A of the inverter detects that the voltage value of the charging capacitor C1 is lower than 0.2VCC, it indicates that the charging capacitor C1 has been completely discharged, at this time, the first port 1A is at a low level, since the first port 1A and the second port 1Y are connected by an inverter, the second port 1Y is at a high level, since the second port 1Y is shorted with the third port 2A, the third port 2A is also at a high level, and the fourth port 2Y is at a low level, at this time, a charging loop of 1Y- > R3- > Rw- > R1- > C1- >2Y is formed, at this time, the polarity of the first probe 200 is a negative electrode, and the polarity of the second probe 201 is a positive electrode; the inverter circularly changes the polarity of the port voltage input to the conversion circuit 401 according to the voltage value at the two ends of the charging capacitor, so that the polarities of the first probe and the second probe are changed, water ions can reciprocate between the first probe and the second probe along with the change of the polarities of the probes, the precipitation of the probe ions can be effectively reduced, the purpose of preventing polarization is achieved, and scales cannot be formed on the surfaces of the probes by the adsorption of negative ions in the same way.
In actual use, the resistance values of the first current limiting resistor R2, the first charge-discharge resistor R1, the second charge-discharge resistor R3, and the capacitance value of the charge capacitor C1 may be specifically set according to the water quality to be detected, and in this embodiment, the resistance values and the capacitance values of the resistors are not limited.
Example two:
the embodiment of the utility model provides a water level detector, fig. 7 shows a water level detector's schematic structural diagram, as shown in fig. 7, this water level detector includes foretell water level detection circuit 700, still includes controller 701 and first grounded capacitor C2, and the output of water level detection circuit 700 is connected with the signal input part of controller 701 through first grounded capacitor C2; the water level detection circuit is used for filtering the generated oscillation voltage signal through a first grounding capacitor and then sending the signal to the controller; the controller is used for receiving the filtered oscillation voltage signal to indicate that the current water level reaches the set position.
For convenience of illustration, fig. 8 shows a schematic circuit structure of another water level detector based on fig. 6, and as shown in fig. 8, a sixth port 3Y of an inverter 400 in the water level detection circuit 700 is used as an output terminal of the water level detection circuit 700, and the sixth port 3Y of the inverter 400 is connected to a signal input terminal 3 of the controller 701 through a first grounded capacitor C2 with a capacitance value of 0.1 microfarad; since the fifth port 3A and the sixth port 3Y of the inverter 400 are a set of channels, when the RC resonant circuit is a discharge circuit, the fourth port 2Y is at a high level, and since the fourth port 2Y is short-circuited with the fifth port 3A, the fifth port 3A is also at a high level, and at this time, the sixth port 3Y sends a low level to the controller; when the RC oscillation circuit is a charging circuit, the fourth port 2Y is at a low level, and since the fourth port 2Y is short-circuited with the fifth port 3A, the fifth port 3A is also at a low level, and at this time, the sixth port 3Y sends a high level to the signal input terminal 3 of the controller; when the controller receives an oscillation signal as shown in fig. 3, it indicates that the current water level has reached or exceeded the fixed positions of the first probe and the second probe, and when the controller does not receive the oscillation signal, it indicates that the current water level has not reached the fixed positions of the first probe and the second probe.
The controller is used as a central processing unit of the whole water level detector, and can be configured with a corresponding circuit system, a control interface and the like to realize the functions. Specifically, the controller may include a single chip, a DSP (Digital Signal Processing), an ARM (Advanced RISC machine, ARM processor), or other Digital logic controller capable of being used for automation control, and may load the control instruction into the memory at any time for storage and execution. Meanwhile, the system can also include units such as a memory, an input/output unit, a power module, and a digital analog unit, which are provided with CPU instructions and related information inside, and the units can be specifically set according to actual use conditions, which is not limited in this embodiment.
In order to ensure that the water level detection circuit can normally operate, the water level detection circuit is also required to be powered; as shown in fig. 9, the water level detector further includes a switch circuit 702 connected to both the signal output terminal of the controller 701 and the power input terminal of the water level detection circuit 700; the switch circuit 702 is used for connecting with an external power supply to supply power to the water level detection circuit when receiving a power supply signal sent by the signal output terminal of the controller.
For easy understanding, as shown in fig. 8, the switching circuit includes a transistor Q1, a second current limiting resistor R4, and a second ground capacitor C3; an emitting electrode of the triode Q1 is used for being connected with an external power supply S, a collector electrode of the triode Q1 is connected with a signal output end 1 of the controller 701 through a second current limiting resistor R4 with the resistance value of 4.7 kilo ohms, and a base electrode of the Q1 of the triode is connected with a power supply input end of the water level detection circuit through a second grounding capacitor C3.
As shown in fig. 8, the power input terminal of the water level detection circuit is the power input terminal VCC of the inverter 400, when the transistor Q1 is a PNP transistor, the transistor Q1 is turned on when the transistor Q1 receives a power supply signal sent by the controller 701 through the signal output terminal 1, and at this time, the power supply voltage VDC of the external power source S is filtered by the second grounding capacitor C3 and then is input to the power input terminal VCC of the inverter 400, so that the water level detection circuit operates normally, the grounding port GND of the inverter 400 is grounded, and the rest of the ports of the inverter 400 can be connected with other electronic devices according to actual needs; specifically, the ground terminal 10 of the controller 701 is grounded, and the power input terminal 20 of the controller 701 is also connected to an external power source S, so that the external power source provides power to the controller.
In order to facilitate the user to know the situation of the controller receiving the signal specifically, as shown in fig. 9, the water level detector further includes a display screen 703 connected to the controller 701; the display screen 703 is used for displaying the filtered oscillation voltage signal.
The display screen may be implemented by an LED (Light-Emitting Diode), in this embodiment, an oscillation voltage signal received by the controller 701 may be displayed to remind a user of the current water level to reach the positions of the first probe and the second probe, as shown in fig. 8, when the upper water level reaches the positions of the first probe and the second probe, the first probe and the second probe cannot be communicated with each other, so that the water level detection circuit cannot form an RC oscillation loop, and at this time, the sixth port 3Y of the inverter 400 continuously sends a high level to the signal input end 3 of the controller 701; at this moment, the continuous and stable high level is displayed on the display screen to remind a user that the current water level does not reach the positions of the first probe and the second probe.
In addition, above-mentioned display screen can also remind the position of user's current water level through the mode that the characters show, for example, when the controller received oscillation signal, the controller can send first demonstration instruction to the display screen, and at this moment, above-mentioned first demonstration instruction is current water level in order to reach probe fixed position promptly, and when the controller received lasting high level, the controller can send the second to the display screen and show the instruction, and at this moment, above-mentioned second shows the instruction and does not reach probe fixed position promptly for current water level. The display mode of the display screen can be flexibly selected according to the requirement.
The embodiment of the utility model provides a water level detector, the water level detection circuit who provides with above-mentioned embodiment has the same technical characteristic, so also can solve the same technical problem, reaches the same technological effect.
Example three:
the embodiment of the utility model provides an electronic equipment is still provided, and this electronic equipment disposes foretell water level detector, and this electronic equipment still includes other electronic parts such as external power source except including above-mentioned water level detector, and the implementation of concrete system can refer to the correlation technique and realize, and here is no longer repeated.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the electronic device and the water level detector described above may refer to the corresponding processes in the foregoing water level detection circuit embodiment, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A water level detection circuit, comprising: the first probe and the second probe are used for detecting the height of a water level; and a charge and discharge circuit connected to the first probe and the second probe;
when the water level reaches the positions of the first probe and the second probe, the first probe and the second probe are communicated through a water quality equivalent resistor to trigger the charge and discharge circuit to work;
the charging and discharging circuit is used for switching between the charging circuit and the discharging circuit by switching the current direction in the working process, and an oscillating voltage signal is generated at the output end to indicate that the current water level reaches a set position.
2. The water level detection circuit according to claim 1, wherein the charge and discharge circuit comprises an inverter, and a conversion circuit connected to the inverter, the conversion circuit comprising a charge capacitor, wherein the conversion circuit is further connected to the first probe and the second probe;
the inverter is used for changing the polarity of the port voltage input to the conversion circuit by the inverter when the voltage value of the charging capacitor is detected to be higher than a preset first voltage threshold value, so that the conversion circuit and the water quality equivalent resistor form the discharge circuit;
the inverter is further used for changing the polarity of the port voltage input to the conversion circuit by the inverter when the voltage value of the charging capacitor is detected to be lower than a preset second voltage threshold value, so that the conversion circuit and the water quality equivalent resistor form the charging circuit;
wherein the first voltage threshold is higher than the second voltage threshold.
3. The water level detection circuit according to claim 2, wherein the switching circuit further comprises a first current limiting resistor, a first charge-discharge resistor and a second charge-discharge resistor;
the first end of the first charge-discharge resistor and the first end of the charge capacitor are connected with the first port of the phase inverter through the first current-limiting resistor, the second end of the first charge-discharge resistor is connected with the first probe, the second end of the charge capacitor is connected with the fourth port of the phase inverter, the first end of the second charge-discharge resistor is connected with the second probe, and the second end of the second charge-discharge resistor is connected with the second port of the phase inverter;
and the second port of the phase inverter is in short circuit with the third port of the phase inverter, and the fourth port of the phase inverter is in short circuit with the fifth port of the phase inverter.
4. A water level detector, comprising the water level detection circuit according to any one of claims 1 to 3, further comprising a controller and a first grounded capacitor, wherein an output terminal of the water level detection circuit is connected to a signal input terminal of the controller through the first grounded capacitor;
the water level detection circuit is used for filtering the generated oscillation voltage signal through the first grounding capacitor and then sending the filtered oscillation voltage signal to the controller;
the controller is used for receiving the filtered oscillation voltage signal to indicate that the current water level reaches a set position.
5. The water level detector according to claim 4, wherein the capacitance value of the first ground capacitor is 0.1 microfarad.
6. The water level detector according to claim 4, further comprising a switching circuit connected to both the signal output terminal of the controller and the power input terminal of the water level detection circuit;
the switch circuit is used for being connected with an external power supply so as to provide electric energy for the water level detection circuit when receiving a power supply signal sent by a signal output end of the controller.
7. The water level detector according to claim 6, wherein the switching circuit comprises a transistor, a second current limiting resistor and a second ground capacitor;
the emitter of the triode is used for being connected with the external power supply, the collector of the triode is connected with the signal output end of the controller through the second current-limiting resistor, and the base of the triode is connected with the power supply input end of the water level detection circuit through the second grounding capacitor.
8. The water level detector according to claim 7, wherein the second current limiting resistor has a resistance of 4.7 kilo ohms.
9. The water level detector of claim 4, further comprising a display screen connected to the controller;
the display screen is used for displaying the filtered oscillation voltage signal.
10. An electronic device, characterized in that it comprises a water level detector according to any one of claims 4-9.
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| CN202021158500.5U CN212082519U (en) | 2020-06-19 | 2020-06-19 | Water level detection circuit, water level detector and electronic equipment |
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| CN202021158500.5U CN212082519U (en) | 2020-06-19 | 2020-06-19 | Water level detection circuit, water level detector and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324618A (en) * | 2021-05-27 | 2021-08-31 | 深圳市纵维立方科技有限公司 | Liquid level detection circuit, device and method |
| CN113933618A (en) * | 2021-09-10 | 2022-01-14 | 荣耀终端有限公司 | Test device, radio frequency device and detection system |
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2020
- 2020-06-19 CN CN202021158500.5U patent/CN212082519U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324618A (en) * | 2021-05-27 | 2021-08-31 | 深圳市纵维立方科技有限公司 | Liquid level detection circuit, device and method |
| CN113933618A (en) * | 2021-09-10 | 2022-01-14 | 荣耀终端有限公司 | Test device, radio frequency device and detection system |
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