CN102155969A - Water level detecting circuit, device and method - Google Patents
Water level detecting circuit, device and method Download PDFInfo
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- CN102155969A CN102155969A CN 201110066368 CN201110066368A CN102155969A CN 102155969 A CN102155969 A CN 102155969A CN 201110066368 CN201110066368 CN 201110066368 CN 201110066368 A CN201110066368 A CN 201110066368A CN 102155969 A CN102155969 A CN 102155969A
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Abstract
The invention provides a water level detecting circuit, comprising a water level judging unit, a first probe, a second probe, a first lead and a second lead, wherein one end of the first lead is connected with the first probe, and the other end of the first lead is connected with the water level judging unit; one end of the second lead is connected with the second probe, and the other end of the second lead is connected with the water level judging unit; the water level judging unit is used for outputting a signal to the first probe; and when the first probe and the second probe are both immersed in water, the second probe feeds back the signal to the water level judging unit. The invention has the following advantages: the water level judging unit outputs the signal to the first probe, and when the first probe and the second probe are both immersed in the water, the second probe feeds back the signal to the water level judging unit; the water level is detected by using the resistance of the water so that less components are adopted; the reliability is improved relatively; the installation is convenient; the requirement on the environment is low; and the cost is relatively low.
Description
Technical field
The present invention relates to the water level detecting field, relate in particular to water level detection circuit, devices and methods therefor.
Background technology
Along with improving constantly of people's living standard, also more and more higher to the intelligentized requirement of household electrical appliance, such as various electric equipments of heating up water, whether there is water or not to need identification automatically, will stop heating under the anhydrous state automatically, avoids occurring security incident.Various sanitary bath equipments need also automatically that identification has water or lack of water, close water valve having under the water state, stop to add water, will open water valve automatically under the exsiccosis, begin to add water.Or the like suchlike application become consumer's primary demand.Water level detection circuit commonly used on the market at present is a condenser type, utilizes the capacitive sensed water level of water, can realize non-contact inductive, safety non-pollution, but reliability is poor, mainly is subjected to the influence of environment and installation site bigger.Cost is also higher.
Summary of the invention
In order to solve the technical matters of prior art middle water level testing circuit poor reliability, the invention provides a kind of water level detection circuit.
The invention provides a kind of water level detection circuit, comprise water level judging unit, first probe, second probe, first lead, second lead, described first lead, one end links to each other with described first probe, its other end links to each other with described water level judging unit, and described second lead, one end links to each other with described second probe, its other end links to each other with described water level judging unit; Described water level judging unit is to the first probe output signal, and when described first probe and described second probe all were dipped in the water, described second probe was given described water level judging unit with signal feedback.
As a further improvement on the present invention, described water level judging unit is a single-chip microcomputer, described single-chip microcomputer is provided with first input/output port and second input/output port, and described first lead links to each other with described first input/output port, and described second lead links to each other with described second input/output port; This water level detection circuit also comprises first electric capacity, second electric capacity, pull-up resistor, described first electric capacity is connected between described first probe and described first input/output port, described second electric capacity is connected between described second probe and described second input/output port, and described pull-up resistor one end is connected between described second electric capacity and described second input/output port, described pull-up resistor other end ground connection.
As a further improvement on the present invention, this water level detection circuit also comprises amplifying circuit, and described amplifying circuit is connected between described second input/output port and the described pull-up resistor.
As a further improvement on the present invention, described amplifying circuit comprises in operational amplifier and the triode at least a.
The present invention also provides a kind of condensate tank of dehumidifier, and this condensate tank of dehumidifier is equipped with water level detection circuit.
The present invention also provides a kind of level testing methods, comprises the steps:
A. the water level judging unit is to the first probe output signal;
B. whether the water level judging unit detects second probe and feeds back signal is arranged, and as second probe feedback signal is arranged, and the water level judgment unit judges goes out first probe and second probe all is dipped in the water so.
As a further improvement on the present invention, also comprise step:
C. the water level judging unit is a single-chip microcomputer, and described single-chip microcomputer is compared to the signal of output and the signal of second probe feedback, thereby judges between first probe and second probe whether water is arranged.
As a further improvement on the present invention, in step C, also comprise:
D. the signal of single-chip microcomputer output transfers to first probe through first electric capacity after straight processing;
E. when the signal level of signal level and the feedback of output was identical, single-chip microcomputer is judged between first probe and second probe so water, and when the signal that feeds back was low level always, single-chip microcomputer was judged between first probe and second probe anhydrous so.
As a further improvement on the present invention, also comprise between step D and step e: the signal of feedback amplifies back input second input/output port through amplifying circuit.
The invention has the beneficial effects as follows: described water level judging unit is to the first probe output signal, when described first probe and described second probe all are dipped in the water, described second probe is given described water level judging unit with signal feedback, by utilizing the resistance type sensed water level of water, adopted components and parts still less, reliability also improves relatively, and it is convenient to install, not high to environmental requirement, cost is also cheap relatively.
Description of drawings
Fig. 1 is the synoptic diagram of the first embodiment of the present invention.
Fig. 2 is the synoptic diagram of the second embodiment of the present invention.
Fig. 3 is the synoptic diagram of the third embodiment of the present invention.
Fig. 4 is a signal C synoptic diagram of the present invention.
Fig. 5 is a signal H synoptic diagram of the present invention.
Fig. 6 is the signal I synoptic diagram of the second embodiment of the present invention.
Fig. 7 is the signal I synoptic diagram of the third embodiment of the present invention.
Fig. 8 is the process flow diagram that water level of the present invention is surveyed detection method.
Fig. 9 is the process flow diagram that water level of the present invention is surveyed the another embodiment of detection method.
Embodiment
As shown in Figure 1 and Figure 4, the invention discloses a kind of water level detection circuit, comprise water level judging unit 1, first probe 31, second probe 32, first lead 21, second lead 22, described first lead, 21 1 ends link to each other with described first probe 31, its other end links to each other with described water level judging unit 1, and described second lead, 22 1 ends link to each other with described second probe 32, its other end links to each other with described water level judging unit 1; Described water level judging unit 1 is to first probe, 31 output signals, and when described first probe 31 and described second probe 32 all were dipped in the water, described second probe 32 was given described water level judging unit 1 with signal feedback.First probe 31 and second probe 32 are placed container 4, in the container 4 water can be housed, by water level judging unit 1 output signal C, and signal C imported first probe 31, if first probe 31 and second probe 32 are all under water, then can signal be imported water level judging unit 1, just water level judging unit 1 can detect signal C by second probe 32, because water has resistance characteristic, can transmit signal; If first probe 31 and second probe 32 are all not under water, second probe 32 can't be imported signal water level judging unit 1, just water level judging unit 1 can not detect signal C yet, because the resistance infinity of air can't be transmitted signal.
As shown in Figure 2, the invention also discloses second kind of embodiment, described water level judging unit 1 is a single-chip microcomputer 11, described single-chip microcomputer 11 is provided with first input/output port 51 and second input/output port 52, described first lead 21 links to each other with described first input/output port 51, and described second lead 22 links to each other with described second input/output port 52; This water level detection circuit also comprises first capacitor C 1, second capacitor C 2, pull-up resistor 6, described first capacitor C 1 is connected between described first probe 31 and described first input/output port 51, described second capacitor C 2 is connected between described second probe 32 and described second input/output port 52, and described pull-up resistor 6 one ends are connected between described second capacitor C 2 and described second input/output port 52, described pull-up resistor 6 other end ground connection.As shown in Figure 5, can produce signal H by single-chip microcomputer 11, signal H is by 51 outputs of first input/output port, after straight, just can obtain signal C by first capacitor C 1, when between first probe 31 and second probe 32 water being arranged, by the impedance of water, signal C is transferred to second probe 32, is transferred to second input/output port 52 by second capacitor C 2 again.Acting as of second capacitor C 2 is anti-interference, prevents entering of extraneous direct current signal, and AC signal C can will be far longer than the resistance of water smoothly by the resistance of pull-up resistor 6 simultaneously.The signal that second input/output port 52 obtains should be the same with signal C, but because the input/output port of common single-chip microcomputer Finite Amplitude diode all, so the actual signal that obtains should be signal I, contrast by signal H and signal I, we are not difficult to find that when signal H was high level, signal I also was a high level, when signal H was low level, signal I also was a low level.We can judge between first probe 31 and second probe 32 thus water, if anhydrous between first probe 31 and second probe 32, signal C can't pass through air transfer, and it is low level that second input/output port 52 obtains signal always.The signal I of second embodiment is signal I shown in Figure 6.
As shown in Figure 3, the invention also discloses the third embodiment, this water level detection circuit also comprises amplifying circuit 7, and described amplifying circuit 7 is connected between described second input/output port 52 and the described pull-up resistor 6.Described amplifying circuit 7 is operational amplifier or triode.The resistance of the pull-up resistor 6 among first embodiment and second embodiment will be far longer than the resistance of water, generally the resistance of our potable water or pure water all between several kilohms to several ten thousand ohm, just just can meet the demands so pull-up resistor 6 is got hundreds of thousands ohm.But the water of high-purities such as picture distilled water, because its degree of purity is very high, its water resistance can reach between 1,000,000 to 2 megohms, at this moment pull-up resistor 6 just needs tens megohms to the hundreds of megohm, under present science and technology, resistance also can't reach so big resistance, and the input resistance of single-chip microcomputer 11 is generally at hundreds of thousands ohm, be far smaller than pull-up resistor 6, can influence test result.So it is not under the very big situation that first embodiment and second embodiment only are suitable for the resistance of water.So for the very big situation of water resistance, if pull-up resistor 6 still adopts the resistance of hundreds of thousands ohm, the signal I that it obtains as shown in Figure 7, compare the less signal I of water resistance, its amplitude is very faint, at this moment we just need to increase an amplifying circuit 7, export to second input/output port 52 again for its detection after signal is amplified.
The invention also discloses a kind of condensate tank of dehumidifier, this condensate tank of dehumidifier is equipped with water level detection circuit.As automatic water boiler electrical equipment, sanitary bath equipment all can be installed water level detection circuit of the present invention.
As shown in Figure 8, the invention also discloses a kind of level testing methods, in step K 1, the water level judging unit is to the first probe output signal.In step K 2, whether the water level judging unit detects second probe and feeds back signal is arranged, and as second probe feedback signal is arranged, and the water level judgment unit judges goes out first probe and second probe all is dipped in the water so.
As shown in Figure 9, be another embodiment of level testing methods of the present invention, in step S1, the signal of single-chip microcomputer output transfers to first probe through first electric capacity after straight processing.In step S2, the signal of feedback amplifies back input second input/output port through amplifying circuit.In step S3, when the signal level of signal level and the feedback of output is identical, single-chip microcomputer is judged between first probe and second probe so water, and when the signal of feedback was low level always, single-chip microcomputer was judged between first probe and second probe anhydrous so.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. water level detection circuit, it is characterized in that: comprise water level judging unit, first probe, second probe, first lead, second lead, described first lead, one end links to each other with described first probe, its other end links to each other with described water level judging unit, and described second lead, one end links to each other with described second probe, its other end links to each other with described water level judging unit; Described water level judging unit is to the first probe output signal, and when described first probe and described second probe all were dipped in the water, described second probe was given described water level judging unit with signal feedback.
2. water level detection circuit according to claim 1, it is characterized in that: described water level judging unit is a single-chip microcomputer, described single-chip microcomputer is provided with first input/output port and second input/output port, described first lead links to each other with described first input/output port, and described second lead links to each other with described second input/output port; This water level detection circuit also comprises first electric capacity, second electric capacity, pull-up resistor, described first electric capacity is connected between described first probe and described first input/output port, described second electric capacity is connected between described second probe and described second input/output port, and described pull-up resistor one end is connected between described second electric capacity and described second input/output port, described pull-up resistor other end ground connection.
3. water level detection circuit according to claim 2 is characterized in that: this water level detection circuit also comprises amplifying circuit, and described amplifying circuit is connected between described second input/output port and the described pull-up resistor.
4. water level detection circuit according to claim 3 is characterized in that: described amplifying circuit comprises in operational amplifier and the triode at least a.
5. condensate tank of dehumidifier, it is characterized in that: this condensate tank of dehumidifier is equipped with aforesaid right requirement 1 to 4 arbitrary described water level detection circuit.
6. a level testing methods is characterized in that, comprises the steps:
The water level judging unit is to the first probe output signal;
Whether the water level judging unit detects second probe and feeds back signal is arranged, and as second probe feedback signal is arranged, and the water level judgment unit judges goes out first probe and second probe all is dipped in the water so.
7. level testing methods according to claim 6 is characterized in that, also comprises step:
C. the water level judging unit is a single-chip microcomputer, and described single-chip microcomputer is compared to the signal of output and the signal of second probe feedback, thereby judges between first probe and second probe whether water is arranged.
8. level testing methods according to claim 7 is characterized in that, also comprises in step C:
D. the signal of single-chip microcomputer output transfers to first probe through first electric capacity after straight processing;
E. when the signal level of signal level and the feedback of output was identical, single-chip microcomputer is judged between first probe and second probe so water, and when the signal that feeds back was low level always, single-chip microcomputer was judged between first probe and second probe anhydrous so.
9. level testing methods according to claim 8 is characterized in that, also comprises between step D and step e: the signal of feedback amplifies back input second input/output port through amplifying circuit.
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| CN 201110066368 CN102155969A (en) | 2011-03-18 | 2011-03-18 | Water level detecting circuit, device and method |
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| CN 201110066368 CN102155969A (en) | 2011-03-18 | 2011-03-18 | Water level detecting circuit, device and method |
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| CN 201110066368 Pending CN102155969A (en) | 2011-03-18 | 2011-03-18 | Water level detecting circuit, device and method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103006073A (en) * | 2012-12-10 | 2013-04-03 | 陈俊平 | Automatic water adding device with water level detection control and control method thereof |
| CN104897238A (en) * | 2015-06-16 | 2015-09-09 | 栗莉 | Automotive vertical oil pointer and mounting method thereof |
| CN104957974A (en) * | 2015-06-26 | 2015-10-07 | 宁波金凌厨房设备有限公司 | Interconnected and intercommunicated intelligent steam box |
| CN105091974A (en) * | 2015-08-28 | 2015-11-25 | 段林玲 | Water level detection device and water level detection method thereof |
| CN105241521A (en) * | 2015-11-18 | 2016-01-13 | 珠海市声驰电器有限公司 | Water level detection circuit |
| CN107270996A (en) * | 2017-07-13 | 2017-10-20 | 厦门芯阳科技股份有限公司 | A kind of water level detection circuit and device |
| CN108427339A (en) * | 2018-02-07 | 2018-08-21 | 厦门芯阳科技股份有限公司 | A kind of stage body flatiron boiler water level state detection circuit and method |
| CN109060070A (en) * | 2018-06-29 | 2018-12-21 | 无锡和晶科技股份有限公司 | A kind of detection system and method that the automatic liquid delivery based on probe-type is used up |
| CN111812921A (en) * | 2020-04-30 | 2020-10-23 | 广东弘景光电科技股份有限公司 | Raindrop detection element and camera module applying same |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103006073A (en) * | 2012-12-10 | 2013-04-03 | 陈俊平 | Automatic water adding device with water level detection control and control method thereof |
| CN103006073B (en) * | 2012-12-10 | 2014-09-10 | 陈俊平 | Automatic water adding device with water level detection control and control method thereof |
| CN104897238A (en) * | 2015-06-16 | 2015-09-09 | 栗莉 | Automotive vertical oil pointer and mounting method thereof |
| CN104957974A (en) * | 2015-06-26 | 2015-10-07 | 宁波金凌厨房设备有限公司 | Interconnected and intercommunicated intelligent steam box |
| CN105091974A (en) * | 2015-08-28 | 2015-11-25 | 段林玲 | Water level detection device and water level detection method thereof |
| CN105091974B (en) * | 2015-08-28 | 2018-04-24 | 段林玲 | Water-level detecting device and its level testing methods |
| CN105241521A (en) * | 2015-11-18 | 2016-01-13 | 珠海市声驰电器有限公司 | Water level detection circuit |
| CN107270996A (en) * | 2017-07-13 | 2017-10-20 | 厦门芯阳科技股份有限公司 | A kind of water level detection circuit and device |
| CN107270996B (en) * | 2017-07-13 | 2021-01-15 | 厦门芯阳科技股份有限公司 | Water level detection circuit and device |
| CN108427339A (en) * | 2018-02-07 | 2018-08-21 | 厦门芯阳科技股份有限公司 | A kind of stage body flatiron boiler water level state detection circuit and method |
| CN109060070A (en) * | 2018-06-29 | 2018-12-21 | 无锡和晶科技股份有限公司 | A kind of detection system and method that the automatic liquid delivery based on probe-type is used up |
| CN111812921A (en) * | 2020-04-30 | 2020-10-23 | 广东弘景光电科技股份有限公司 | Raindrop detection element and camera module applying same |
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Application publication date: 20110817 |