CN215116009U - Moisture measurement circuit and moisture measuring apparatu - Google Patents
Moisture measurement circuit and moisture measuring apparatu Download PDFInfo
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- CN215116009U CN215116009U CN202023209788.7U CN202023209788U CN215116009U CN 215116009 U CN215116009 U CN 215116009U CN 202023209788 U CN202023209788 U CN 202023209788U CN 215116009 U CN215116009 U CN 215116009U
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- 238000005259 measurement Methods 0.000 title claims description 25
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 235000013339 cereals Nutrition 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model provides a moisture measuring circuit and a measuring instrument, which comprises an oscillating circuit and an adjustable reference source; the oscillating circuit comprises a resistor R1, a resistor R2, a selector, a comparator, a resistor RT and a capacitor C; the resistor R1 is connected with the resistor R2 in series, and the output end of the resistor R2 is grounded; the input end 1 pin of the selector is connected between the resistor R1 and the resistor R2; the pin 2 at the input end of the selector is connected with the output end of the adjustable reference source; the output end of the selector is connected with the positive input end of the comparator; the output end of the comparator is simultaneously connected with the pin 3 at the input end of the selector and the input end of the resistor RT; the output end of the resistor RT is simultaneously connected with the negative input end of the comparator and the capacitor C; the opposite end of the capacitor C connected to the resistor RT is connected to ground. The utility model discloses initial frequency's when can realizing the circuit start is unified, has avoided influencing moisture measuring accuracy because of measured object self electric capacity among the practical application.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, concretely relates to moisture measurement circuit and moisture measuring apparatu.
Background
Moisture measurement is an indispensable link in the cereal storage process, measures cereal moisture content and can be used to confirm the inside humidity of warehouse on the one hand and whether need the ventilation operation in order to judge, and on the other hand also provides the basis to judging the interior cereal weight of warehouse.
Existing moisture measurement methods include capacitance methods, resistance methods, infrared methods, microwave methods, and the like. The water content is measured by a capacitance method, and the water content of the measured object can be obtained by measuring the capacitance change and substituting the capacitance change into a formula for calculation according to the difference of dielectric coefficients of the measured object under different water content states.
In the prior art, moisture measurement is performed by an RC oscillation circuit. In practical application, after the device for measuring moisture is restarted, the initial oscillation frequency of the device for measuring moisture is influenced by a measured object to change, so that the calculated capacitance value is inaccurate, and the accuracy of water measurement data is influenced. In addition, there is also a technical scheme that a plurality of data comparators are used in an oscillating circuit to realize the moisture content measurement by a capacitance method, and the application has the problem of poor consistency of the comparators and is easy to influence the accuracy of the water measurement data.
Therefore, it is necessary to provide a moisture measuring circuit which is simple and convenient to operate and accurate in measurement.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the prior art, the utility model provides a moisture measurement circuit can realize easy and simple to handle, measure accurate moisture measurement.
The utility model discloses realize the technical scheme of above-mentioned effect and lie in:
the utility model provides a moisture measuring circuit, which comprises an oscillating circuit and one or more adjustable reference sources, wherein the adjustable reference sources are used for providing reference voltage to ensure that the initial frequency of the circuit is consistent when the circuit is started;
further, the oscillating circuit comprises a resistor R1, a resistor R2, a selector, a comparator, a resistor RT and a capacitor C.
Further, the resistor R1 is connected in series with the resistor R2, the output end of the resistor R2 is grounded, and the resistor R1 and the resistor R2 are used for voltage division and providing an electrifying voltage for the moisture measuring circuit;
the input end 1 pin of the selector is connected between the resistor R1 and the resistor R2;
the pin 2 at the input end of the selector is connected with the output end of the adjustable reference source;
the output end of the selector is connected with the positive input end of the comparator; the selector is used for selecting and outputting power-on voltage or reference voltage according to the high and low levels output by the output end of the comparator;
the output end of the comparator is simultaneously connected with the pin 3 at the input end of the selector and the input end of the resistor RT;
the output end of the resistor RT is simultaneously connected with the negative input end of the comparator and the capacitor C;
the opposite end of the capacitor C connected to the resistor RT is connected to ground.
The utility model provides a moisture measuring circuit, including an oscillating circuit and two adjustable reference sources, oscillating circuit includes comparator 1, comparator 2, AND gate, resistance RT and electric capacity C, adjustable reference source includes adjustable reference source 1, adjustable reference source 2, adjustable reference source is used for providing power voltage, and initial frequency when making the circuit start is unanimous.
Further, the adjustable reference source 1 is connected in series with the adjustable reference source 2, an output end of the adjustable reference source 1 is connected to the positive input end of the comparator 1, and an output end of the adjustable reference source 2 is connected to the positive input end of the comparator 2;
the output end of the comparator 1 is connected to the first input end of the AND gate, and the output end of the comparator 2 is connected to the second input end of the AND gate;
the output end of the AND gate is connected with the capacitor C through the resistor RT, and the other end of the capacitor C is grounded;
and the capacitor C is respectively connected with the negative input end of the comparator 1 and the negative input end of the comparator 2.
Further, the adjustable reference source is one of an analog reference source and a digital-analog mixed reference source.
The utility model also provides a moisture measuring instrument, including foretell moisture measuring circuit.
The utility model provides a moisture measurement circuit's advantage lies in: the initial frequency of the moisture measuring circuit can be consistent only by setting the output voltage of the adjustable reference source without manual conditions, so that the moisture measuring error is reduced, and the measuring accuracy and efficiency are improved; furthermore, the utility model provides a moisture measurement circuit simple structure, the uniformity is good, and stability is high.
Drawings
Fig. 1 is a schematic diagram of a moisture measurement circuit provided by the present invention.
Fig. 2 is a schematic diagram of another moisture measurement circuit provided by the present invention.
Fig. 3 is a schematic diagram of a moisture measurement circuit provided by an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples.
The utility model provides a moisture measuring circuit, as shown in FIG. 1, this circuit includes an oscillating circuit and an adjustable reference source, the output of adjustable reference source connect in 2 feet of selector input end among the oscillating circuit for provide reference voltage, the initial frequency of chip is unanimous when making the circuit start, reduces the error.
In one embodiment, the oscillator circuit includes a resistor R1, a resistor R2, a selector, a comparator, a resistor RT, and a capacitor C. VCC is connected to resistance R1 one end, one end with resistance R2 connects in series, resistance R2 output ground, resistance R1 and resistance R2 are used for the partial pressure, for the moisture measuring circuit provides last electric voltage.
The pin 1 of the input end of the selector is connected between a resistor R1 and a resistor R2, the pin 2 of the input end of the selector is connected with the adjustable reference source, the pin 3 of the input end of the selector is connected with the output end of the comparator, and the output end of the selector is connected with the positive input end of the comparator. The selector is used for selecting the input voltage of the circuit according to the high-low level output by the comparator.
The output end of the comparator is simultaneously connected with the 3 pins of the input end of the selector and the input end of the resistor RT, and is used for feeding back an output signal to the selector and transmitting an output voltage to the resistor RT.
The output end of the resistor RT is connected with the capacitor C and used for charging the capacitor C.
And one end of the capacitor C is connected with the resistor RT and the negative input end of the comparator, and the other end of the capacitor C is grounded and used for charging and discharging according to the voltage output by the positive input end and the negative input end of the selector. By detecting the signal frequency output by the output end of the selector, the specific numerical value of the capacitor C can be calculated, and the specific moisture content of the measured material can be calculated according to a formula.
In one embodiment, as shown in fig. 2, the adjustable reference source is a digital-to-analog converter, and the output reference voltage can be adjusted as needed.
In one embodiment, as shown in fig. 3, the moisture measurement circuit includes an oscillation circuit and two adjustable reference sources, the oscillation circuit includes a comparator 1, a comparator 2, an and gate, a resistor RT and a capacitor C, the adjustable reference sources include an adjustable reference source 1 and an adjustable reference source 2, and the adjustable reference sources are used for providing a power-on voltage to make the initial frequency of the circuit at the time of starting consistent.
The adjustable reference source 1 is connected in series with the adjustable reference source 2, an output end of the adjustable reference source 1 is connected to a positive input end of the comparator 1, and an output end of the adjustable reference source 2 is connected to a positive input end of the comparator 2;
the output end of the comparator 1 is connected to the first input end of the AND gate, and the output end of the comparator 2 is connected to the second input end of the AND gate;
the output end of the AND gate is connected with the capacitor C through the resistor RT, and the other end of the capacitor C is grounded;
and the capacitor C is respectively connected with the negative input end of the comparator 1 and the negative input end of the comparator 2.
In one embodiment, the adjustable reference source is an analog reference source.
The specific value of the capacitance C of the measured material can be calculated by detecting the signal frequency output by the output end of the AND gate, and the specific moisture content of the measured material can be calculated according to a formula.
In one embodiment, the moisture measurement circuit described above may be used in a moisture meter. The moisture measuring instrument using the moisture measuring circuit can be used for moisture measurement in the storage process of grains such as wheat, corn, rice, soybean and the like, soil moisture measurement, wall moisture measurement in the industrial field, concrete moisture measurement and the like.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (4)
1. A moisture measurement circuit comprising an oscillator circuit and an adjustable reference source;
the oscillating circuit comprises a resistor R1, a resistor R2, a selector, a comparator, a resistor RT and a capacitor C;
the resistor R1 is connected with the resistor R2 in series, and the output end of the resistor R2 is grounded;
the input end 1 pin of the selector is connected between the resistor R1 and the resistor R2;
the pin 2 at the input end of the selector is connected with the output end of the adjustable reference source;
the output end of the selector is connected with the positive input end of the comparator;
the output end of the comparator is simultaneously connected with the pin 3 at the input end of the selector and the input end of the resistor RT;
the output end of the resistor RT is simultaneously connected with the negative input end of the comparator and the capacitor C;
the opposite end of the capacitor C connected to the resistor RT is connected to ground.
2. A moisture measurement circuit comprising an oscillator circuit and a plurality of adjustable reference sources; the oscillating circuit comprises a comparator 1, a comparator 2, an AND gate, a resistor RT and a capacitor C, and the adjustable reference source comprises an adjustable reference source 1 and an adjustable reference source 2;
the adjustable reference source 1 is connected in series with the adjustable reference source 2, an output end of the adjustable reference source 1 is connected to a positive input end of the comparator 1, and an output end of the adjustable reference source 2 is connected to a positive input end of the comparator 2;
the output end of the comparator 1 is connected to the first input end of the AND gate, and the output end of the comparator 2 is connected to the second input end of the AND gate;
the output end of the AND gate is connected with the capacitor C through the resistor RT, and the other end of the capacitor C is grounded;
and the capacitor C is respectively connected with the negative input end of the comparator 1 and the negative input end of the comparator 2.
3. The moisture measurement circuit of any one of claims 1-2, wherein the adjustable reference source is one of an analog reference source, a mixed digital and analog reference source.
4. A moisture measuring instrument comprising the moisture measuring circuit according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023209788.7U CN215116009U (en) | 2020-12-28 | 2020-12-28 | Moisture measurement circuit and moisture measuring apparatu |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023209788.7U CN215116009U (en) | 2020-12-28 | 2020-12-28 | Moisture measurement circuit and moisture measuring apparatu |
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| CN215116009U true CN215116009U (en) | 2021-12-10 |
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| CN202023209788.7U Active CN215116009U (en) | 2020-12-28 | 2020-12-28 | Moisture measurement circuit and moisture measuring apparatu |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505113A (en) * | 2020-12-28 | 2021-03-16 | 西安恩狄集成电路有限公司 | Moisture measurement circuit and moisture measurement method |
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2020
- 2020-12-28 CN CN202023209788.7U patent/CN215116009U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505113A (en) * | 2020-12-28 | 2021-03-16 | 西安恩狄集成电路有限公司 | Moisture measurement circuit and moisture measurement method |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A moisture measuring circuit and moisture measuring instrument Effective date of registration: 20220328 Granted publication date: 20211210 Pledgee: Xi'an investment and financing Company limited by guarantee Pledgor: Xi'an Endi Integrated Circuit Co.,Ltd. Registration number: Y2022610000113 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20211210 Pledgee: Xi'an investment and financing Company limited by guarantee Pledgor: Xi'an Endi Integrated Circuit Co.,Ltd. Registration number: Y2022610000113 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |