CN204944611U - Water level detection circuit and water level detecting system - Google Patents
Water level detection circuit and water level detecting system Download PDFInfo
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- CN204944611U CN204944611U CN201520771330.0U CN201520771330U CN204944611U CN 204944611 U CN204944611 U CN 204944611U CN 201520771330 U CN201520771330 U CN 201520771330U CN 204944611 U CN204944611 U CN 204944611U
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- water level
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Abstract
The utility model provides a kind of water level detection circuit and water level detecting system, and water level detection circuit comprises: AC power, the first detecting electrode and the second detecting electrode, and the first detecting electrode is connected to the first end of AC power; Half-wave rectifying circuit, the first input end of half-wave rectifying circuit is connected to the second end of AC power, and the second input end of half-wave rectifying circuit is connected to the second detecting electrode, and half-wave rectifying circuit is used for carrying out rectification process to AC power, and output detections voltage; Voltage comparator circuit, is connected to the output terminal of half-wave rectifying circuit, and voltage comparator circuit is used for comparing detection voltage and reference voltage, to export the detection signal for determining whether to detect water level.It is alternating current that the technical solution of the utility model makes by the electric current of detecting electrode, and the electron ion impurity avoided in liquid is forced to be attached on probe, thus extends the serviceable life of detecting electrode, further increases the reliability of water level detection circuit.
Description
Technical field
The utility model relates to water level detecting technical field, in particular to a kind of water level detection circuit and a kind of water level detecting system.
Background technology
In existing electric pole type water level detecting scheme, unidirectional by the direction of current of electrode probe, namely electric current always flows to another electrode probe from one of them electrode probe, charged ion in water constantly moves to the cathode portion of electrode probe with electric current, and be attached on electrode probe, due to the long term accumulation of charged ion foreign material, electrode probe fouling can be made, so can cause electrode probe lost efficacy and cannot sensed water level.
Therefore, the electron ion impurity in liquid how can be avoided to force to be attached on probe, thus the serviceable life extending probe become technical matters urgently to be resolved hurrily.
Utility model content
The utility model is intended at least to solve one of technical matters existed in prior art or correlation technique.
For this reason, the purpose of this utility model is to propose a kind of new water level detection circuit, making by the electric current of detecting electrode is alternating current, the electron ion impurity avoided in liquid is forced to be attached on probe, thus extend the serviceable life of detecting electrode, further improve the reliability of water level detection circuit, improve product quality, improve user satisfaction.
Another object of the present utility model is to propose a kind of water level detecting system.
For achieving the above object, according to the embodiment of first aspect of the present utility model, propose a kind of water level detection circuit, comprising: AC power, the first detecting electrode and the second detecting electrode, described first detecting electrode is connected to the first end of described AC power; Half-wave rectifying circuit, the first input end of described half-wave rectifying circuit is connected to the second end of described AC power, second input end of described half-wave rectifying circuit is connected to described second detecting electrode, described half-wave rectifying circuit is used for carrying out rectification process to described AC power, and output detections voltage; Voltage comparator circuit, is connected to the output terminal of described half-wave rectifying circuit, and described voltage comparator circuit is used for comparing described detection voltage and reference voltage, to export the detection signal for determining whether to detect water level.
According to the water level detection circuit of embodiment of the present utility model, by leading to the AC power of sign change to detecting electrode, constantly to circulate on clockwise and counterclockwise conversion with the electric current making to flow through the first detecting electrode and the second detecting electrode, in charged ion impurity in water being in circulate, can not be deposited on detecting electrode and form incrustation scale, thus extend the serviceable life of detecting electrode, further improve the reliability of water level detection circuit, save circuit maintenance cost, improve product quality, improve user satisfaction; Simultaneously by half-wave rectifying circuit output detections voltage, for follow-up water level detecting provides necessary guarantee.
According to above-described embodiment of the present utility model, following technical characteristic can also be had:
According to an embodiment of the present utility model, described half-wave rectifying circuit comprises: the first diode, and the anode of described first diode is connected to the first end of the first resistance, and the second end of described first resistance is as the first input end of described half-wave rectifying circuit; Second diode, the anode of described second diode is connected to the negative electrode of described first diode, the anode of described second diode is connected to the first end of the second resistance, second end of described second resistance is as the second input end of described half-wave rectifying circuit, and the negative electrode of described second diode is as the output terminal of described half-wave rectifying circuit.
According to an embodiment of the present utility model, described voltage comparator circuit comprises: the 3rd resistance and the 4th resistance, between the output terminal being connected to described half-wave rectifying circuit after described 3rd resistance and described 4th resistant series and ground; Voltage comparator, the first input end of described voltage comparator is connected between described 3rd resistance and described 4th resistance, second input end of described voltage comparator is connected to the output terminal of reference voltage circuit, and described reference voltage circuit is for generation of described reference voltage.
According to an embodiment of the present utility model, described reference voltage circuit comprises: the 5th resistance and the 6th resistance, be connected between direct supply and ground after described 5th resistance and described 6th resistant series, any point between described 5th resistance and described 6th resistance is as the output terminal of described reference voltage circuit.
According to an embodiment of the present utility model, also comprise: filter capacitor, the first end of described filter capacitor is connected between described 3rd resistance and described 4th resistance, the second end ground connection of described filter capacitor.
According to an embodiment of the present utility model, also comprise: filtering circuit, be connected to the output terminal of described voltage comparator circuit, carry out filtering process for the described detection signal exported described voltage comparator circuit.
According to an embodiment of the present utility model, also comprise: the 3rd diode, the negative electrode of described 3rd diode is connected to the first input end of described half-wave rectifying circuit, the plus earth of described 3rd diode.
According to the embodiment of second aspect of the present utility model, also proposed a kind of water level detecting system, comprising: at least one water level detection circuit as described in above-mentioned any one technical scheme; And main control chip, the signal input part of described main control chip is connected to the output terminal of water level detection circuit described at least one, and described main control chip is used for the height of the described detection signal determination water level exported according to each described water level detection circuit.
According to above-described embodiment of the present utility model, following technical characteristic can also be had:
According to an embodiment of the present utility model, also comprise: signal indicating circuit, described signal indicating circuit is connected to the control end of described main control chip, and described signal indicating circuit is used to indicate the water level height that described water level detecting system detects.
According to an embodiment of the present utility model, water level detection circuit described at least one shares same described first detecting electrode.
Additional aspect of the present utility model and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the structural representation of the water level detection circuit according to embodiment of the present utility model;
Fig. 2 shows the structural representation of the water level detecting system according to an embodiment of the present utility model;
Fig. 3 shows the structural representation of the water level detecting system according to another embodiment of the present utility model.
Embodiment
In order to more clearly understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the utility model; but; the utility model can also adopt other to be different from other modes described here and implement, and therefore, protection domain of the present utility model is not by the restriction of following public specific embodiment.
Fig. 1 shows the structural representation of the water level detection circuit according to embodiment of the present utility model.
As shown in Figure 1, according to the water level detection circuit of embodiment of the present utility model, comprising: AC power V1 (being preferably 10V, 50Hz), direct supply VDD (preferred 5V), resistance R2, resistance R5, resistance R7, resistance R17, resistance R18, resistance R20, resistance R22, resistance R21, resistance R23, electric capacity C3, C5, diode D1, D2, D3 and operational amplifier U1A.
Wherein, the effect of main components:
V1 is power supply, output AC electricity.
R2 is used for model fluid resistance, two ends are respectively probe 1 (the first namely above-mentioned detecting electrode) and probe 2 (the second above-mentioned detecting electrodes), probe 1 and probe 2 pass through fluid communication, the resistance of liquid is subject to the factor such as concentration, pressure, temperature, sectional area, the distance impact of impurity, so the resistance of liquid changes within the specific limits.
D1 and D3 forms rectification circuit, R5 and R7 plays protection circuit; D2 plays oppositely cut-off.
R20 and R22 forms a bleeder circuit, for U1A in the same way input end provide one detect voltage.
R21 and R23 forms a bleeder circuit, for U1A reverse input end provides a reference voltage.
C5 is filter capacitor, to flatten cunning for making the signal after rectification.
Operational amplifier U1A make comparisons in circuit device use.
R17 is the pull-up resistor of operational amplifier U1A output port.
R18 and C3 forms RC filtering circuit, carries out filtering process for the signal exported operational amplifier U1A.
Particularly, the course of work of water level detection circuit is as follows:
The voltage waveform of V1 power supply is sinusoidal wave, when being in sinusoidal wave positive axis, electric current passes through "+" end, R2, R5, D1, R20, R22, D2 of power supply V1, returns "-" end of power supply V1, form a loop, electric current flows to probe 2 direction through probe 1.
When being in sinusoidal wave negative semiaxis, electric current passes through "-" end, R7, D3, R5, R2 of power supply V1, return power supply "+" end, form a loop, electric current flows to probe 1 direction through probe 2, the electric currents so just making power supply flow through two probes constantly circulate conversion on clockwise and counterclockwise, in the charged ion impurity in water being in circulate, can not be deposited on electrode probe and form incrustation scale.
When probe 1 all touches water with probe 2, alternating current, through D1 half-wave rectification, becomes direct current, and R20 and R22 forms a bleeder circuit, the input end in the same way of R22 mono-termination U1A, and a termination GND provides voltage V0 to the input end in the same way of U1A.Resistance R1 and R23 forms a bleeder circuit, the reverse input end of R23 mono-termination U1A, one termination GND, a benchmark voltage V1 is provided to the reverse input end of U1A, the positive termination VDD of power supply (5V) power supply of operational amplifier U1A, the power supply negativing ending grounding of amplifier amplifier U1A, U1A compares V0 and V1, now V0 exports 5V high level signal higher than V1, U1A output terminal.
When water level is at probe 1, probe 1 does not have medium conducting with probe 2, and probe 2 does not have electric current to pass through, and voltage V0 is that 0V, U1A compare V0 and V1, and now V0 is lower than V1, the output terminal output low level signal of amplifier U1A.
As shown in Figure 2, the output terminal (being specially the output terminal of operational amplifier U1A) of water level detection circuit connects the input port of single-chip microcomputer (MCU), and single-chip microcomputer (MCU) judges whether water level to be detected according to the low and high level signal received and programmed logic.
Fig. 3 shows the structural representation of the water level detecting system according to another embodiment of the present utility model.
As shown in Figure 3, in the present embodiment, operational amplifier can adopt LM2903 integrated chip, half-wave rectification is carried out by the rectification circuit formed by diode, comparative voltage is provided to the input end in the same way of LM2903, and by bleeder circuit, provide a reference voltage to the reverse input end of LM2903.
LED3 is power light, lights after circuit powers on.
Water level detecting system shown in Fig. 3 includes the water level detection circuit shown in two Fig. 1, and two water level detection circuits share same public probe.
The equal output low level of output terminal of the LM2903 when anhydrous in two water level detection circuits, MCU control LED1 and LED2 extinguishes, and shows anhydrous; The water level signal received is fed back to water pump control modules by MCU, to control the break-make of water pump.
When only having low-water level, the output terminal detecting the LM2903 in the water level detection circuit of low-water level exports high level, and detect the output terminal output low level of the LM2903 in the water level detection circuit of high water stage, MCU control LED1 lights, and LED2 extinguishes, display low-water level; The water level signal received is fed back to water pump control modules by MCU, to control the break-make of water pump.
Whether those skilled in the art, it is to be noted that water level detecting system can increase according to actual conditions setting or reduce the number of water level detection circuit, reaches different At The Heights with sensed water level; Meanwhile, the operational amplifier in water level detection circuit can substitute with triode.
The technical scheme of the present embodiment is by giving the alternating current of the logical positive and negative change of probe, make the electric current reverse circulation conversion flowing through probe, charged impurity in water can not be deposited on probe, can effectively delay electrode fouling, thus extend the serviceable life of electric pole type water level switch, save maintenance cost.
More than be described with reference to the accompanying drawings the technical solution of the utility model, the utility model proposes a kind of new water level detection circuit, making by the electric current of detecting electrode is alternating current, the electron ion impurity avoided in liquid is forced to be attached on detecting electrode, thus extend the serviceable life of detecting electrode, further improve the reliability of water level detection circuit, improve product quality, improve user satisfaction.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a water level detection circuit, is characterized in that, comprising:
AC power, the first detecting electrode and the second detecting electrode, described first detecting electrode is connected to the first end of described AC power;
Half-wave rectifying circuit, the first input end of described half-wave rectifying circuit is connected to the second end of described AC power, second input end of described half-wave rectifying circuit is connected to described second detecting electrode, described half-wave rectifying circuit is used for carrying out rectification process to described AC power, and output detections voltage;
Voltage comparator circuit, is connected to the output terminal of described half-wave rectifying circuit, and described voltage comparator circuit is used for comparing described detection voltage and reference voltage, to export the detection signal for determining whether to detect water level.
2. water level detection circuit according to claim 1, is characterized in that, described half-wave rectifying circuit comprises:
First diode, the anode of described first diode is connected to the first end of the first resistance, and the second end of described first resistance is as the first input end of described half-wave rectifying circuit;
Second diode, the anode of described second diode is connected to the negative electrode of described first diode, the anode of described second diode is connected to the first end of the second resistance, second end of described second resistance is as the second input end of described half-wave rectifying circuit, and the negative electrode of described second diode is as the output terminal of described half-wave rectifying circuit.
3. water level detection circuit according to claim 1, is characterized in that, described voltage comparator circuit comprises:
3rd resistance and the 4th resistance, between the output terminal being connected to described half-wave rectifying circuit after described 3rd resistance and described 4th resistant series and ground;
Voltage comparator, the first input end of described voltage comparator is connected between described 3rd resistance and described 4th resistance, second input end of described voltage comparator is connected to the output terminal of reference voltage circuit, and described reference voltage circuit is for generation of described reference voltage.
4. water level detection circuit according to claim 3, is characterized in that, described reference voltage circuit comprises:
5th resistance and the 6th resistance, be connected between direct supply and ground after described 5th resistance and described 6th resistant series, any point between described 5th resistance and described 6th resistance is as the output terminal of described reference voltage circuit.
5. water level detection circuit according to claim 3, is characterized in that, also comprises:
Filter capacitor, the first end of described filter capacitor is connected between described 3rd resistance and described 4th resistance, the second end ground connection of described filter capacitor.
6. water level detection circuit according to claim 1, is characterized in that, also comprises:
Filtering circuit, is connected to the output terminal of described voltage comparator circuit, carries out filtering process for the described detection signal exported described voltage comparator circuit.
7. water level detection circuit according to any one of claim 1 to 6, is characterized in that, also comprises:
3rd diode, the negative electrode of described 3rd diode is connected to the first input end of described half-wave rectifying circuit, the plus earth of described 3rd diode.
8. a water level detecting system, is characterized in that, comprising:
At least one water level detection circuit according to any one of claim 1 to 7; And
Main control chip, the signal input part of described main control chip is connected to the output terminal of water level detection circuit described at least one, and described main control chip is used for the height of the described detection signal determination water level exported according to each described water level detection circuit.
9. water level detecting system according to claim 8, is characterized in that, also comprises:
Signal indicating circuit, described signal indicating circuit is connected to the control end of described main control chip, and described signal indicating circuit is used to indicate the water level height that described water level detecting system detects.
10. water level detecting system according to claim 8 or claim 9, it is characterized in that, water level detection circuit described at least one shares same described first detecting electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520771330.0U CN204944611U (en) | 2015-09-29 | 2015-09-29 | Water level detection circuit and water level detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520771330.0U CN204944611U (en) | 2015-09-29 | 2015-09-29 | Water level detection circuit and water level detecting system |
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| CN204944611U true CN204944611U (en) | 2016-01-06 |
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| CN201520771330.0U Expired - Fee Related CN204944611U (en) | 2015-09-29 | 2015-09-29 | Water level detection circuit and water level detecting system |
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| CN107024002A (en) * | 2017-03-15 | 2017-08-08 | 万家乐热能科技有限公司 | The condensate liquid of condensing water heater blocks monitoring device and method |
| CN108759977A (en) * | 2018-04-27 | 2018-11-06 | 青岛海尔科技有限公司 | A kind of immersion detection device |
| CN108775856A (en) * | 2018-05-14 | 2018-11-09 | 兰州天启基因生物科技有限公司 | Liquid detecting device, liquid detecting method and liquid detection system |
| CN108827421A (en) * | 2018-06-13 | 2018-11-16 | 广东万家乐燃气具有限公司 | A kind of bathtub water-level detecting device |
| CN109855702A (en) * | 2019-03-21 | 2019-06-07 | 佛山市顺德区美的饮水机制造有限公司 | Kettle liquid level detection device and water dispenser |
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| CN112903065A (en) * | 2021-01-28 | 2021-06-04 | 周启军 | Water level monitoring device for hydraulic engineering |
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| CN106768166A (en) * | 2017-02-22 | 2017-05-31 | 梁志强 | A kind of irrigation system and the soil evaporativeness sensing device for irrigation system |
| CN107024002B (en) * | 2017-03-15 | 2022-06-10 | 万家乐热能科技有限公司 | Condensate blockage monitoring device and method for condensing water heater |
| CN107024002A (en) * | 2017-03-15 | 2017-08-08 | 万家乐热能科技有限公司 | The condensate liquid of condensing water heater blocks monitoring device and method |
| CN108759977A (en) * | 2018-04-27 | 2018-11-06 | 青岛海尔科技有限公司 | A kind of immersion detection device |
| CN108775856A (en) * | 2018-05-14 | 2018-11-09 | 兰州天启基因生物科技有限公司 | Liquid detecting device, liquid detecting method and liquid detection system |
| CN108775856B (en) * | 2018-05-14 | 2024-06-11 | 海宁博上生物科技股份有限公司 | Liquid detection device, liquid detection method and liquid detection system |
| CN108827421A (en) * | 2018-06-13 | 2018-11-16 | 广东万家乐燃气具有限公司 | A kind of bathtub water-level detecting device |
| CN109855702B (en) * | 2019-03-21 | 2020-06-30 | 佛山市顺德区美的饮水机制造有限公司 | Kettle liquid level detection device and water dispenser |
| CN109855702A (en) * | 2019-03-21 | 2019-06-07 | 佛山市顺德区美的饮水机制造有限公司 | Kettle liquid level detection device and water dispenser |
| CN112816025A (en) * | 2021-01-11 | 2021-05-18 | 杨双武 | Water level detection circuit for atomizer |
| CN112903065A (en) * | 2021-01-28 | 2021-06-04 | 周启军 | Water level monitoring device for hydraulic engineering |
| CN112903065B (en) * | 2021-01-28 | 2022-09-09 | 重庆德生鼎盛实业发展有限公司 | Water level monitoring device for hydraulic engineering |
| CN113854816A (en) * | 2021-09-22 | 2021-12-31 | 华帝股份有限公司 | Evaporator water level detection method and circuit and kitchen electrical equipment |
| CN115615515A (en) * | 2022-12-19 | 2023-01-17 | 河北卧牛净水设备有限公司 | Water dispenser control system and water dispenser |
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