CN101738241A - Capacitive water level measuring apparatus for solar water heater - Google Patents
Capacitive water level measuring apparatus for solar water heater Download PDFInfo
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- CN101738241A CN101738241A CN200810234773A CN200810234773A CN101738241A CN 101738241 A CN101738241 A CN 101738241A CN 200810234773 A CN200810234773 A CN 200810234773A CN 200810234773 A CN200810234773 A CN 200810234773A CN 101738241 A CN101738241 A CN 101738241A
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Abstract
The invention provides a capacitive water level measuring apparatus for a solar water heater, which is characterized by comprising a capacitive sensor and a capacitance measuring circuit, wherein the capacitive sensor is a parallel-plate capacitor; the capacitance measuring circuit comprises a multi-resonant oscillator, a mono-stable trigger, an operational amplifier and a comparator; the multi-resonant oscillator directly produces a periodically fixed pulse through a No.555 circuit; the duty ratio of the output pulse varies according to different resistance of the mono-stable trigger and different capacitance to be tested to obtain different output average voltages; the output pulse is converted into a direct current voltage through a low-pass filtering circuit; the output direct current voltage is amplified through a follower and the operational amplifier and is compared with a reference voltage through the comparator; the output of the comparator is connected with the cathode of a light-emitting diode, and the anode of the diode is connected with the voltage; and when the output voltage is greater than the reference voltage, a corresponding diode emits light. The measuring apparatus has the characteristics of simple and compact design, reasonable structure and low manufacturing cost, and fully solves the problem of scale deposit in a resistive water level meter.
Description
Technical field
The present invention relates to a kind of floodometer, particularly a kind of capacitive water level measuring apparatus for solar water heater.
Background technology
Limnimeter can make the people intuitively water level be shown that in each field application is arranged all, wherein the utilization in solar water heater has made things convenient for huge numbers of families especially.Now sun power water level instrument on the market mostly is the resistance type water level instrument, and its principle is simple, and promptly the sensor that is composed in series by fixed resistance inserts water tank, and resistance changes with the position that water level soaked electric resistance sensor.This limnimeter cost is lower, but it has a shortcoming, when resistive surface after after a while can amass the last layer incrustation scale, thereby measurement can't be carried out, so must periodic replacement.
Summary of the invention
Technical matters to be solved by this invention is at the deficiencies in the prior art, and a kind of simplicity of design compactness, rational in infrastructure, capacitive water level measuring apparatus for solar water heater that cost of manufacture is lower are provided.
Technical matters to be solved by this invention is to realize by following technical scheme.The present invention is a kind of capacitive water level measuring apparatus for solar water heater, it is characterized in that, it comprises capacitance type sensor and capacitance measurement circuit, and described capacitance type sensor is a plane-parallel capacitor; Described capacitance measurement circuit comprises multivibrator, monostalbe trigger, operational amplifier and comparer; Described monostalbe trigger is made of 555 circuit, resistance and testing capacitance; Multivibrator is by the directly fixing pulse of generation cycle of 555 circuit, the different output pulse duty factor differences that make according to monostalbe trigger resistance and testing capacitance, obtain different output average voltages, to export pulses switch by low-pass filter circuit again is DC voltage, the DC voltage of output is amplified by follower, operational amplifier, compare by comparer and reference voltage again, comparer output sending and receiving optical diode negative pole, diode cathode connects voltage, when output voltage during greater than reference voltage, respective diode is luminous.
The inventor adopts Electronic Workbench (EWB) as simulation software condenser type floodometer of the present invention to be debugged, and test result is as follows:
| Capacitance/pF | ??100 | ??200 | ??300 | ??400 | ??500 | ??600 | ??700 | ??800 | ??900 |
| Output voltage values/V | ??1.02 | ??1.38 | ??1.69 | ??1.99 | ??2.31 | ??2.6 | ??2.91 | ??3.22 | ??3.53 |
| Bright lamp number | ??0 | ??1 | ??2 | ??3 | ??4 | ??5 | ??6 | ??7 | ??8 |
Annotate: voltage＞1.02V space-time water level lamp extinguishes
Compared with prior art, the present invention measures changes in capacitance by the difference of water and air specific inductive capacity between capacitor plate, can realize this function by the capacitance type sensor and the capacitance measurement circuit that design an insertion water tank.Dielectric can not obtain different capacitances simultaneously between the two-plate of capacitance type sensor (plane-parallel capacitor), because the specific inductive capacity of water is much larger than air, so when between pole plate during SEA LEVEL VARIATION, capacitance can have significant change.The present invention will convert corresponding voltage output to the corresponding capacitance of different water levels exactly, thereby make the LED that is installed in different water levels place luminous, reach the purpose of sensed water level.Wherein, the highest sending out a warning when anhydrous the time, when water level raise, corresponding green LED brightened successively, and time high red light was bright when water was full.The present invention is simple in structure, and circuit design is simply compact, and cost of manufacture is lower, has overcome the incrustation scale problem fully, is fit to family and uses.
Description of drawings
Fig. 1 is a kind of theory diagram of the present invention.
Embodiment
Following with reference to accompanying drawing, further describe concrete technical scheme of the present invention, so that those skilled in the art understands the present invention further, and do not constitute restriction to its right.
Embodiment 1.With reference to Fig. 1.A kind of capacitive water level measuring apparatus for solar water heater, it comprises capacitance type sensor and capacitance measurement circuit, described capacitance type sensor is a plane-parallel capacitor; Described capacitance measurement circuit comprises multivibrator, monostalbe trigger, operational amplifier and comparer; Described monostalbe trigger is made of 555 circuit, resistance and testing capacitance; Multivibrator is by the directly fixing pulse of generation cycle of 555 circuit, the different output pulse duty factor differences that make according to monostalbe trigger resistance and testing capacitance, obtain different output average voltages, to export pulses switch by low-pass filter circuit again is DC voltage, the DC voltage of output is amplified by follower, operational amplifier, compare by comparer and reference voltage again, comparer output sending and receiving optical diode negative pole, diode cathode connects voltage, when output voltage during greater than reference voltage, respective diode is luminous.
Claims (1)
1. a capacitive water level measuring apparatus for solar water heater is characterized in that, it comprises capacitance type sensor and capacitance measurement circuit, and described capacitance type sensor is a plane-parallel capacitor; Described capacitance measurement circuit comprises multivibrator, monostalbe trigger, operational amplifier and comparer; Described monostalbe trigger is made of 555 circuit, resistance and testing capacitance; Multivibrator is by the directly fixing pulse of generation cycle of 555 circuit, the different output pulse duty factor differences that make according to monostalbe trigger resistance and testing capacitance, obtain different output average voltages, to export pulses switch by low-pass filter circuit again is DC voltage, the DC voltage of output is amplified by follower, operational amplifier, compare by comparer and reference voltage again, comparer output sending and receiving optical diode negative pole, diode cathode connects voltage, when output voltage during greater than reference voltage, respective diode is luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810234773A CN101738241A (en) | 2008-11-17 | 2008-11-17 | Capacitive water level measuring apparatus for solar water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810234773A CN101738241A (en) | 2008-11-17 | 2008-11-17 | Capacitive water level measuring apparatus for solar water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101738241A true CN101738241A (en) | 2010-06-16 |
Family
ID=42462009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810234773A Pending CN101738241A (en) | 2008-11-17 | 2008-11-17 | Capacitive water level measuring apparatus for solar water heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101738241A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398754A (en) * | 2013-07-12 | 2013-11-20 | 广东卓耐普智能技术股份有限公司 | Three-in-one sensor |
| CN105300477A (en) * | 2015-11-03 | 2016-02-03 | 天津市飞跃兄弟测控技术有限公司 | Water level measuring method and ruler |
| CN108168652A (en) * | 2017-12-08 | 2018-06-15 | 安徽泰德电子科技有限公司 | A kind of household electrical appliance water level detecting and controlling circuit |
-
2008
- 2008-11-17 CN CN200810234773A patent/CN101738241A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398754A (en) * | 2013-07-12 | 2013-11-20 | 广东卓耐普智能技术股份有限公司 | Three-in-one sensor |
| CN103398754B (en) * | 2013-07-12 | 2016-01-20 | 广东卓耐普智能股份有限公司 | Three-in-one sensor |
| CN105300477A (en) * | 2015-11-03 | 2016-02-03 | 天津市飞跃兄弟测控技术有限公司 | Water level measuring method and ruler |
| CN105300477B (en) * | 2015-11-03 | 2019-06-25 | 天津市飞跃兄弟测控技术有限公司 | A kind of water level measurement method and water level measuring scale |
| CN108168652A (en) * | 2017-12-08 | 2018-06-15 | 安徽泰德电子科技有限公司 | A kind of household electrical appliance water level detecting and controlling circuit |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100616 |