CN101876646B - Humidity detecting method by pulsed voltage - Google Patents
Humidity detecting method by pulsed voltage Download PDFInfo
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- CN101876646B CN101876646B CN 200910031361 CN200910031361A CN101876646B CN 101876646 B CN101876646 B CN 101876646B CN 200910031361 CN200910031361 CN 200910031361 CN 200910031361 A CN200910031361 A CN 200910031361A CN 101876646 B CN101876646 B CN 101876646B
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- humidity
- pulse voltage
- voltage
- sparking electrode
- pulse
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Abstract
The invention relates to a humidity detecting method by a pulsed voltage, comprising a discharge electrode, a continuous pulse air discharge circuit and a control unit, the method comprises the step of determining a breakdown voltage between discharge electrodes by changing the pulsed voltage of a continuous pulse discharge circuit and comprises the step of determining the humidity according to the breakdown voltage at a certain temperature.
Description
Technical field
The present invention relates to a kind of method of measuring humidity.
Background technology
At present, the method for measurement humidity has a lot.For example utilize material self geometrical variations to measure the method for humidity, measurement with wet, condensation dew point method.The lithium chloride dew point method, electricity psychrometric method (electric-resistivity method, capacitance method), electrolytic process (coulometric hygrometer) and other measuring methods, though these measuring method precision are very high, but cost is corresponding also very high, and some method is restricted under hot conditions, and certain methods has the possibility of contaminated environment because will use chemical reagent, therefore generally is not suitable for to be installed in the domestic electric appliance and high temperature applied environment that cost control is had relatively high expectations.
China utility model patent CN 03 218839.0 discloses a kind of novel humidity sensor, but disclosed humidity sensor circuit control is more complex relatively in this patent, therefore also and be not suitable in the common domestic electric appliance.
Summary of the invention
At above problem, the purpose of this invention is to provide a kind of simply relatively, and be applicable to that to accuracy requirement be not the method that detects humidity in the very high household electrical appliance.
For achieving the above object, the present invention realizes in the following manner: a kind of method that detects humidity by pulse voltage, comprise in order to produce the sparking electrode of electric spark, continuous impulse discharge circuit and the control module of pulse voltage are provided, and described method comprises the step of determining voltage breakdown between the sparking electrode by the pulse voltage of the described continuous impulse discharge circuit of conversion; And the step of determining humidity according to described voltage breakdown.
As a kind of preferred implementation of the present invention, described continuous impulse discharge circuit increases the certain amplitude of pulse voltage at regular intervals.
As the another kind of preferred implementation of the present invention, described sparking electrode is connected with spark detection circuit, when described spark detection circuit detects electric spark, and described control module record pulse voltage at this moment.
As the another kind of preferred implementation of the present invention, described spark detection circuit comprises discharge pulse induction detecting element.
As the another kind of preferred implementation of the present invention, described spark detection circuit comprises optical detection device.
As the another kind of preferred implementation of the present invention, store the mapping table of humidity and pulse voltage in certain temperature range in the described control module.
As the another kind of preferred implementation of the present invention, described method also comprises the step of searching corresponding humidity according to the pulse voltage that records by described humidity and the mapping table of pulse voltage under specified temp.
As the another kind of preferred implementation of the present invention, also comprise the display module that shows detected humidity value.
Useful technique effect of the present invention is: by the pulse discharging voltage between the utilization variation sparking electrode and then the voltage breakdown between definite sparking electrode, after determining voltage breakdown, can check in the detection of corresponding moisturt register and then realization humidity according to the relation table between pulse voltage and the humidity.This method is especially more effective under hot conditions, and cost is lower, and because not using more environmental protection of chemical reagent, is easy to be installed on that accuracy of detection is required is not in the very high domestic electric appliance.
Description of drawings
Fig. 1 is the electrical block diagram according to specific embodiment of the invention humidity detection method;
Fig. 2 sets synoptic diagram according to the pulse voltage of specific embodiment of the invention Humidity Detection mode.
Embodiment
As shown in Figure 1, according to the specific embodiment of the invention, comprise sparking electrode, continuous impulse discharge circuit, spark detection circuit, control module, temperature detecting unit and display module.Link to each other apart from the certain distance setting and with described continuous impulse discharge circuit between the described sparking electrode, described spark detection circuit links to each other with described sparking electrode, described control module links to each other with described spark detection circuit and display module with described continuous impulse discharge circuit, stores humidity and the pulse voltage mapping table under the uniform temperature condition in the described control module.
Described high-voltage pulse is realized in the following manner: by electronic switch S
1Continuous switch, make step-up transformer T
1Constantly produce pulse voltage, and by commutation diode D
1Give storage capacitor C
1Charging; Then by divider resistance R
1, R
2With storage capacitor C
1The linear dividing potential drop of charging voltage, the magnitude of voltage Vout1 and the D/A converter U that draw by dividing potential drop
2Setting voltage V
RefCompare, if reach setting voltage V
Ref, voltage comparator U then
3Make discharge switch S
2Conducting, thus make C
1Spark, at transformer T
2Primary coil in produce exciting current, thereby at transformer T
2Secondary coil induce high-voltage pulse output.V by the control module change
RefValue can change output sparking voltage value.
Described transformer T
2Secondary coil and sparking electrode P
1Link to each other sparking electrode P
2With discharge examination transformer T
3Primary coil link to each other described transformer T
3Secondary coil link to each other with optic coupling element, when described optic coupling element detects described sparking electrode P
1With P
2Between when having spark to occur, then feed back signal to described control module, described control module can predicate described sparking electrode P
1With P
2Between breakdown.
For the detection of effluve spark, the present invention also can use the method for optoelectronic induction device simultaneously, shown in frame of broken lines among Fig. 1.
During test, from minimum pulse voltage, increase the certain pulse voltage amplitude then at regular intervals, voltage ascensional range minimum value is by resolution, the divider resistance R of the digital/analog converter in the circuit
1, R
2Linear intrinsic standoff ratio and the transformer output turn ratio determine.
Under the certain situation of two described sparking electrodes distance, voltage ascensional range maximal value depends on the accuracy class of the relative humidity of needs measurement, and voltage rising step-length by front stage circuits to capacitor C
1Charging rate determine that it be along with the raising of voltage breakdown can prolong, but the duty of pulse width modulator that can be by regulating prime is recently accelerated.The duration of charging was 0.05s when for example output voltage was 2000V among the present invention, and with reference to as shown in Figure 2, the duration of charging is 0.1s when output voltage reaches maximum 25KV.
By changing the distance between the sparking electrode, can change the disruptive discharge magnitude of voltage.Distance is more big, and then sparking voltage is more big.In use, suitable electrode distance must be set.
When the pulse voltage that puts on described sparking electrode two ends is elevated to certain value, described sparking electrode P
1With P
2Between then the disruptive discharge phenomenon can appear, namely can detect described sparking electrode P by described optic coupling element
1With P
2Between the discharge current that produces, described control module is according to the signal record high-voltage pulse at this moment of described optic coupling element feedback, it is the voltage breakdown between described sparking electrode P1 and the P2, can check in the corresponding humidity of this pulse voltage, the i.e. humidity value that detects according to the specific embodiment of the invention according to the high-voltage pulse value that records by described humidity and pulse voltage mapping table then.
According to the specific embodiment of the invention, by detecting voltage breakdown between the sparking electrode then according to pulse voltage and the humidity mapping table of storage in advance in the described control module, can obtain corresponding humidity value, therefore, implement more simply according to the Humidity Detection mode of the specific embodiment of the invention, and cost is also lower.
Certainly, the above embodiment of lifting only is preferred embodiments of the present invention, the present invention can also have many other embodiments, for the person of ordinary skill of the art, that does under instruction of the present invention changes at equivalence of the present invention, must be included in the scope that claim of the present invention advocates.
Claims (4)
1. method that detects the humidity of household electrical appliance by pulse voltage, comprise in order to produce the sparking electrode of electric spark, continuous impulse discharge circuit and the control module of pulse voltage are provided, store the mapping table of humidity and pulse voltage in certain temperature range in the wherein said control module; Described method comprises step:
Pulse voltage by the described continuous impulse discharge circuit of conversion is determined voltage breakdown between the sparking electrode, and wherein said continuous impulse discharge circuit increases the certain amplitude of pulse voltage at regular intervals;
Determine humidity according to described voltage breakdown, comprise according to the pulse voltage that records and search corresponding humidity by described humidity with the mapping table of pulse voltage; And
Show detected humidity value by display module.
2. method according to claim 1, it is characterized in that: described sparking electrode is connected with spark detection circuit, when described spark detection circuit detects electric spark, the pulse voltage of described control module record this moment.
3. method according to claim 2 is characterized in that: described spark detection circuit comprises discharge pulse induction detecting element.
4. method according to claim 2, it is characterized in that: described spark detection circuit comprises optical detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910031361 CN101876646B (en) | 2009-04-30 | 2009-04-30 | Humidity detecting method by pulsed voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910031361 CN101876646B (en) | 2009-04-30 | 2009-04-30 | Humidity detecting method by pulsed voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101876646A CN101876646A (en) | 2010-11-03 |
| CN101876646B true CN101876646B (en) | 2013-10-09 |
Family
ID=43019256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910031361 Expired - Fee Related CN101876646B (en) | 2009-04-30 | 2009-04-30 | Humidity detecting method by pulsed voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101876646B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4337454B2 (en) * | 2003-07-24 | 2009-09-30 | 日本ゼオン株式会社 | Optical compensation film, optical compensation film manufacturing method, optical laminate, and liquid crystal display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS577570A (en) * | 1980-06-18 | 1982-01-14 | Toshiba Corp | Tester for dielectric strength of gas |
| JPH04337454A (en) * | 1991-05-14 | 1992-11-25 | Nippon Oil & Fats Co Ltd | Device for measuring dielectric breakdown voltage for emulsion explosive |
-
2009
- 2009-04-30 CN CN 200910031361 patent/CN101876646B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4337454B2 (en) * | 2003-07-24 | 2009-09-30 | 日本ゼオン株式会社 | Optical compensation film, optical compensation film manufacturing method, optical laminate, and liquid crystal display device |
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| Publication number | Publication date |
|---|---|
| CN101876646A (en) | 2010-11-03 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20200430 |
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| CF01 | Termination of patent right due to non-payment of annual fee |