CN204086191U - Humidity measuring circuit - Google Patents
Humidity measuring circuit Download PDFInfo
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- CN204086191U CN204086191U CN201420616016.0U CN201420616016U CN204086191U CN 204086191 U CN204086191 U CN 204086191U CN 201420616016 U CN201420616016 U CN 201420616016U CN 204086191 U CN204086191 U CN 204086191U
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Abstract
The utility model discloses a kind of humidity measuring circuit, comprise the first potential electrode, the second potential electrode, operational amplifier U1, slide rheostat RP, resistance R1, R3-R7, transformer T1, electric capacity C1, C2 and C5, diode D1-D4, pulse oscillator IC2.Described humidity measuring circuit detects the humidity in space to be measured by first and second potential electrode, and by operational amplifier U1, electric current is amplified, corresponding current value can be measured, the humidity value that larger current value is then corresponding larger afterwards by adding reometer in the right of resistance R3.Meanwhile, described pulse oscillator IC2 is made up of 555 integrated circuit, and its voltage exported boosts through transformer T, to reach the higher voltage exporting first and second potential electrode to.This higher voltage is first and second potential electrode of output valve after the rectification of diode D3, D4 and electric capacity C1, C2 again, uses for measurement.Above-mentioned humidity measuring circuit structure is simple, cost is lower.
Description
Technical field
The utility model relates to a kind of testing circuit, particularly a kind of circuit for detecting humidity.
Background technology
Along with the raising of city safety-protection system Construction and management demand, originally single video monitoring system to be met an urgent need prevention and control system upgrade and development to digitizing, and front-end equipment also integrates application development by single analog video camera to plurality of devices such as digital high-definition web camera, video intercom, emergent alarm buttons.Because more safety-protection system is all installed on open air, therefore, the impact of humidity on safety-protection system of surrounding enviroment can not be ignored.Existing humidity measuring circuit is all comparatively complicated, and cost is higher.
Utility model content
For above-mentioned the deficiencies in the prior art, technical problem to be solved in the utility model is: provide simple, the lower-cost humidity measuring circuit of a kind of structure.
A kind of humidity measuring circuit provided by the utility model, comprises the first potential electrode, the second potential electrode, operational amplifier U1, slide rheostat RP, resistance R1, R3-R7, transformer T1, electric capacity C1, C2 and C5, diode D1-D4, pulse oscillator IC2;
Described first potential electrode is connected with one end of electric capacity C1 and the negative electrode of diode D3 by resistance R1, described second potential electrode is connected with the negative input of operational amplifier U1, described second potential electrode is also connected with the anode of diode D1 and the negative electrode of diode D2, and the negative electrode of described diode D1 and the anode of diode D2 are all connected with the electrode input end of operational amplifier U1;
The negative input of described operational amplifier U1 is also connected with one end of slide rheostat RP, the other end of described slide rheostat RP is connected with the output terminal of operational amplifier U1, the output terminal of described operational amplifier U1 is also connected with the power end of operational amplifier U1 by resistance R3 and R4 successively, node between described resistance R3 and R4 is also by resistance R5 ground connection, and the power end of described operational amplifier U1 is also direct to be connected with voltage source V CC;
The other end of described electric capacity C1 is connected with one end of electric capacity C2, the other end of described electric capacity C2 is connected with the anode of diode D4, the negative electrode of described diode D4 is connected with the anode of diode D3, node between described diode D3 and D4 is connected with one end of the secondary coil of transformer T1, and the other end of the secondary coil of described transformer T1 is connected with the node between electric capacity C1 and C2; Described electric capacity C2 is connected with the negative electrode of diode D1 with the node between diode D4.
One end of the primary coil of described transformer T1 is connected with first pin of pulse oscillator IC2, crus secunda and the tripod of described pulse oscillator IC2 are all connected with voltage source V CC, described tripod is also successively by resistance R6, R7 ground connection, 4th pin of described pulse oscillator IC2 is connected to the node between resistance R6 and R7,5th pin of described pulse oscillator IC2 and the 6th pin are all connected to the node between resistance R7 and electric capacity C3, the direct ground connection of the 7th pin of described pulse oscillator IC2.
Conveniently open or close whole humidity measuring circuit, described humidity measuring circuit also comprises switch S 1, and described switch S 1 is connected between the first detecting electrode and the second detecting electrode.
In order to carry out filtering to the voltage exporting transformer T1 to, described humidity measuring circuit also comprises electric capacity C3, and described electric capacity C3 is connected between the primary coil of transformer T1 and first pin of pulse oscillator IC2.
Further, described humidity measuring circuit also comprises electric capacity C4, and described electric capacity C4 is connected between resistance R7 and the earth.
More accurate in order to what regulate precision, described humidity measuring circuit also comprises resistance R2, and described resistance R2 is connected between the output terminal of slide resistor RP and operational amplifier U1.
Above-mentioned humidity measuring circuit detects the humidity in space to be measured by first and second potential electrode, and by operational amplifier U1, electric current is amplified, corresponding current value can be measured, the humidity value that larger current value is then corresponding larger afterwards by adding reometer in the right of resistance R3.Meanwhile, described pulse oscillator IC2 is made up of 555 integrated circuit, and its voltage exported boosts through transformer T, to reach the higher voltage exporting first and second potential electrode to.This higher voltage is first and second potential electrode of output valve after the rectification of diode D3, D4 and electric capacity C1, C2 again, uses for measurement.Above-mentioned humidity measuring circuit structure is simple, cost is lower.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of the better embodiment of the utility model humidity measuring circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
First, before embodiment is described, be necessary that some terms to occurring make an explanation herein.Such as:
Use the term such as " first ", " second " to describe various element if occur herein, but these elements should not limited by these terms.These terms are only used for differentiation element and another element.Therefore, " first " element also can be called as " second " element and not depart from instruction of the present utility model.
In addition, should be understood that, when mentioning an element " connection " or " connection " to another element, it can directly connect or directly be connected to another element or also can there is intermediary element.On the contrary, when mentioning that an element " directly connection " or " directly connecting " are to another element, then there is not intermediary element.
The various terms occurred in this article are only not intended to conduct to restriction of the present utility model for describing the object of concrete embodiment.Unless context is clearly pointed out in addition, then singulative intention also comprises plural form.
" comprise " when using term in this manual and/or " including " time, these terms specify the existence of described feature, entirety, step, operation, element and/or parts, but also do not get rid of more than one other features, entirety, step, operation, element, the existence of parts and/or its group and/or additional.
About embodiment:
Refer to Fig. 1, the better embodiment of humidity measuring circuit of the present utility model comprises the first potential electrode, the second potential electrode, operational amplifier U1, switch S 1, slide rheostat RP, resistance R1-R7, transformer T1, electric capacity C1-C5, diode D1-D4, pulse oscillator IC2.
Described first potential electrode is connected with one end of electric capacity C1 and the negative electrode of diode D3 by resistance R1, described second potential electrode is connected with the negative input of operational amplifier U1, described second potential electrode is also connected with the anode of diode D1 and the negative electrode of diode D2, and the negative electrode of described diode D1 and the anode of diode D2 are all connected with the electrode input end of operational amplifier U1.Switch S 1 is also connected with between described first potential electrode and the second potential electrode.
The negative input of described operational amplifier U1 is also connected with one end of slide rheostat RP, the other end of described slide rheostat RP is connected with the output terminal of operational amplifier U1 by resistance R2, the output terminal of described operational amplifier U1 is also connected with the power end of operational amplifier U1 by resistance R3 and R4 successively, and the node between described resistance R3 and R4 is also by resistance R5 ground connection.The power end of described operational amplifier U1 is also direct to be connected with voltage source V CC.
The other end of described electric capacity C1 is connected with one end of electric capacity C2, the other end of described electric capacity C2 is connected with the anode of diode D4, the negative electrode of described diode D4 is connected with the anode of diode D3, node between described diode D3 and D4 is connected with one end of the secondary coil of transformer T1, and the other end of the secondary coil of described transformer T1 is connected with the node between electric capacity C1 and C2.Described electric capacity C2 is connected with the negative electrode of diode D1 with the node between diode D4.
One end of the primary coil of described transformer T1 is connected with first pin of pulse oscillator IC2 by electric capacity C3, crus secunda and the tripod of described pulse oscillator IC2 are all connected with voltage source V CC, described tripod is also successively by resistance R6, R7 and electric capacity C4 ground connection, 4th pin of described pulse oscillator IC2 is connected to the node between resistance R6 and R7,5th pin of described pulse oscillator IC2 and the 6th pin are all connected to the node between resistance R7 and electric capacity C3, the direct ground connection of the 7th pin of described pulse oscillator IC2.
Above-mentioned humidity measuring circuit detects the humidity in space to be measured by first and second potential electrode, and by operational amplifier U1, electric current is amplified, corresponding current value can be measured, the humidity value that larger current value is then corresponding larger afterwards by adding reometer in the right of resistance R3.When the humidity value of the air in space to be measured is larger, the current value between first and second potential electrode is larger, and the numerical value measured by reometer is larger.To be detected by the humidity of existing hygrometer to detection space in advance and current value now corresponding to reometer can calculate corresponding relation between humidity value and current value, and then the humidity value in other moment space to be measured can be known.Certainly, in order to the humidity value in convenient reading space to be measured all the time, described reometer also can be connected to the right of resistance R3 all the time, is namely connected in series with resistance R3.In present embodiment, the effect of described operational amplifier U1 is to amplify electric current, and to improve the precision of testing result, if according to the needs at scene without the need to higher precision, then this operational amplifier U1 also can omit.
Described pulse oscillator IC2 is made up of 555 integrated circuit, and its voltage exported boosts through transformer T, to reach the higher voltage exporting first and second potential electrode to.This higher voltage is first and second potential electrode of output valve after the rectification of diode D3, D4 and electric capacity C1, C2 again, uses for measurement.
These are only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. a humidity measuring circuit, is characterized in that: described humidity measuring circuit comprises the first potential electrode, the second potential electrode, operational amplifier U1, slide rheostat RP, resistance R1, R3-R7, transformer T1, electric capacity C1, C2 and C5, diode D1-D4, pulse oscillator IC2;
Described first potential electrode is connected with one end of electric capacity C1 and the negative electrode of diode D3 by resistance R1, described second potential electrode is connected with the negative input of operational amplifier U1, described second potential electrode is also connected with the anode of diode D1 and the negative electrode of diode D2, and the negative electrode of described diode D1 and the anode of diode D2 are all connected with the electrode input end of operational amplifier U1;
The negative input of described operational amplifier U1 is also connected with one end of slide rheostat RP, the other end of described slide rheostat RP is connected with the output terminal of operational amplifier U1, the output terminal of described operational amplifier U1 is also connected with the power end of operational amplifier U1 by resistance R3 and R4 successively, node between described resistance R3 and R4 is also by resistance R5 ground connection, and the power end of described operational amplifier U1 is also direct to be connected with voltage source V CC;
The other end of described electric capacity C1 is connected with one end of electric capacity C2, the other end of described electric capacity C2 is connected with the anode of diode D4, the negative electrode of described diode D4 is connected with the anode of diode D3, node between described diode D3 and D4 is connected with one end of the secondary coil of transformer T1, and the other end of the secondary coil of described transformer T1 is connected with the node between electric capacity C1 and C2; Described electric capacity C2 is connected with the negative electrode of diode D1 with the node between diode D4;
One end of the primary coil of described transformer T1 is connected with first pin of pulse oscillator IC2, crus secunda and the tripod of described pulse oscillator IC2 are all connected with voltage source V CC, described tripod is also successively by resistance R6, R7 ground connection, 4th pin of described pulse oscillator IC2 is connected to the node between resistance R6 and R7,5th pin of described pulse oscillator IC2 and the 6th pin are all connected to the node between resistance R7 and electric capacity C3, the direct ground connection of the 7th pin of described pulse oscillator IC2.
2. humidity measuring circuit as claimed in claim 1, it is characterized in that: described humidity measuring circuit also comprises switch S 1, described switch S 1 is connected between the first detecting electrode and the second detecting electrode.
3. humidity measuring circuit as claimed in claim 1, it is characterized in that: described humidity measuring circuit also comprises electric capacity C3, described electric capacity C3 is connected between the primary coil of transformer T1 and first pin of pulse oscillator IC2.
4. humidity measuring circuit as claimed in claim 1, is characterized in that: described humidity measuring circuit also comprises electric capacity C4, and described electric capacity C4 is connected between resistance R7 and the earth.
5. humidity measuring circuit as claimed in claim 1, it is characterized in that: described humidity measuring circuit also comprises resistance R2, described resistance R2 is connected between the output terminal of slide resistor RP and operational amplifier U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420616016.0U CN204086191U (en) | 2014-10-23 | 2014-10-23 | Humidity measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420616016.0U CN204086191U (en) | 2014-10-23 | 2014-10-23 | Humidity measuring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204086191U true CN204086191U (en) | 2015-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420616016.0U Active CN204086191U (en) | 2014-10-23 | 2014-10-23 | Humidity measuring circuit |
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| CN (1) | CN204086191U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017152370A1 (en) * | 2016-03-08 | 2017-09-14 | 张舒维 | New soil moisture detection device for agricultural production |
| CN109115840A (en) * | 2018-07-12 | 2019-01-01 | 赵秀卿 | Single line carrier type space tester |
-
2014
- 2014-10-23 CN CN201420616016.0U patent/CN204086191U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017152370A1 (en) * | 2016-03-08 | 2017-09-14 | 张舒维 | New soil moisture detection device for agricultural production |
| CN109115840A (en) * | 2018-07-12 | 2019-01-01 | 赵秀卿 | Single line carrier type space tester |
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