CN204044177U - A kind of wind speed measuring circuit - Google Patents
A kind of wind speed measuring circuit Download PDFInfo
- Publication number
- CN204044177U CN204044177U CN201420464636.7U CN201420464636U CN204044177U CN 204044177 U CN204044177 U CN 204044177U CN 201420464636 U CN201420464636 U CN 201420464636U CN 204044177 U CN204044177 U CN 204044177U
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- China
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- resistance
- optocoupler
- pin
- triode
- wind speed
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Abstract
Wind speed measuring circuit of the present utility model, comprise incremental optical-electricity encoder, Schmidt trigger U1, resistance R1, resistance R2, triode Q1, optocoupler U2, resistance R3, two input ends of incremental optical-electricity encoder connect 5V voltage and ground end respectively, the output terminal of incremental optical-electricity encoder connects first pin of Schmidt trigger U1, second pin contact resistance R1 one end of Schmidt trigger U1, the base stage of the other end connecting triode Q1 of resistance R1, the grounded emitter of triode Q1, the collector of triode Q1 connects second pin of optocoupler U2, optocoupler U2 first pin connects 5V voltage by resistance R2, optocoupler U2 the 3rd pin connects 5V voltage by resistance R3, optocoupler U2 the 4th pin ground connection.The wind speed of sense organ, based on incremental optical-electricity encoder, is converted into exact figure and shows by this device, is no more than 5% to the measuring error of wind speed range in 0-9999rpm.
Description
Technical field
The utility model relates to a kind of metering circuit, specifically a kind of wind speed measuring circuit.
Background technology
Early stage wind velocity measurement system is in structure or all fairly simple in measuring method, be exactly in most cases use some simple instrument, tachometric survey is carried out completely by people, although whole system cost is lower, but the function singleness realized, reliability is not high, and measurement range and measuring accuracy are all lower.
Utility model content
In order to solve the problem, the utility model provides a kind of wind speed measuring circuit, adopts the circuit design of photo-electric, can realize the high precision of wind speed, measure in real time on a large scale.
The utility model is by the following technical solutions: a kind of wind speed measuring circuit, it is characterized in that, comprise incremental optical-electricity encoder, Schmidt trigger U1, resistance R1, resistance R2, triode Q1, optocoupler U2, resistance R3, two input ends of described incremental optical-electricity encoder connect 5V voltage and ground end respectively, the output terminal of described incremental optical-electricity encoder connects first pin of Schmidt trigger U1, second pin contact resistance R1 one end of described Schmidt trigger U1, the base stage of the other end connecting triode Q1 of resistance R1, the grounded emitter of triode Q1, the collector of triode Q1 connects second pin of optocoupler U2, first pin of optocoupler U2 connects 5V voltage by resistance R2, 3rd pin of optocoupler U2 connects 5V voltage by resistance R3, the 4th pin ground connection of optocoupler U2.
Further, the model of described Schmidt trigger U1 is 74HC14N.
Further, the model of described optocoupler U2 is 6N137.
Further, described triode Q1 is NPN type triode.
The beneficial effects of the utility model are: this device is based on the measuring principle of photo-electric, devise brand-new wind speed measuring circuit, by the fast processing to signal, the wind speed of sense organ is converted into exact figure show, 5% can be no more than to the measuring error of wind speed range in 0-9999rpm.
Accompanying drawing explanation
Fig. 1 is theory structure schematic diagram of the present utility model.
Embodiment
Wind speed measuring circuit as shown in Figure 1 comprises incremental optical-electricity encoder, Schmidt trigger U1, resistance R1, resistance R2, NPN type triode Q1, optocoupler U2, resistance R3, two input ends of described incremental optical-electricity encoder connect 5V voltage and ground end respectively, the output terminal of described incremental optical-electricity encoder connects first pin of Schmidt trigger U1, second pin contact resistance R1 one end of described Schmidt trigger U1, the base stage of the other end connecting triode Q1 of resistance R1, the grounded emitter of triode Q1, the collector of triode Q1 connects second pin of optocoupler U2, first pin of optocoupler U2 connects 5V voltage by resistance R2, 3rd pin of optocoupler U2 connects 5V voltage by resistance R3, the 4th pin ground connection of optocoupler U2.
Incremental encoder converts displacement to periodic electric signal, again this electric signal is transformed into count pulse, the size of displacement is represented by the number of pulse, advantage due to incremental encoder is that structure is simple, except can directly measured angular displacement, also be usually used in surveying spindle speed, so wind speed measuring device adopts incremental encoder.
At present, in the velocity-measuring system formed with photoelectric encoder, conventional digital rotating speed measurement method mainly contains three kinds, is M method (frequency method), T method (periodic method), M/T method (frequency/period method) respectively.M method is within set detection time, and the number measuring the rotational speed pulse signal produced, to determine rotating speed, compares and is suitable for high speed situation; T method determines rotating speed, the occasion that applicable velocity ratio is lower at the time of measuring adjacent two rotational speed pulse signals; M/T method be measure simultaneously detection time and at this moment in the number of rotational speed pulse signal to determine rotating speed.For the measuring wind speed module of this device, the method for employing is: adopt T method during low speed, adopts M method during high speed.
Schmidt trigger is the one of MOS trigger, and be mainly used in waveform conversion, the model herein adopted is 74HC14N.
Photo-coupler is a kind of by input end lumination of light emitting diode, and control the conducting of output photoelectric pipe, namely utilize optically-coupled mode to transmit the particular device of numerical information, maximum feature input and output two parts can be kept apart.When robot calculator is connected with peripherals, there will be induced noise, the problems such as ground loop noise, computing machine can not be imported into make interference, to improve the reliability of system, so use photoelectrical coupler input signal and computing machine to be separated, single-chip microcomputer is the same with the situation of computing machine, all anti-interference, and the equipment of periphery may think the situations such as some reason is short-circuited, in order to not affect the work of single-chip microcomputer, protection single-chip microcomputer, also single-chip microcomputer and peripherals to be separated, so in wind direction and measuring wind speed module, 6N137 photoelectrical coupler is adopted to isolate through input signal and single-chip microcomputer.
During use, the 3rd pin of optocoupler U2 is connected on single-chip microcomputer.
According to the principle of work of increment absolute optical encoder, incremental encoder is the sensor increment type directly exporting digital quantity, increment type absolute optical encoder output low level, oppositely high level is obtained through 74HC14N phase inverter, Q1 triode ON, make the conducting of 6N137 optocoupler, single-chip microcomputer pin obtains low level.
The selection of current-limiting resistance size, premised on light emitting diode can normally work, generally should should not be greater than 10mA by the electric current of light emitting diode, and calculating R2 accordingly and should select above 1.2K, for safety, is 2K in native system.The selection of receiving end resistance should can Correct logical relation be as the criterion, and when input end is high level " 1 ", the conducting of receiving end photodiode, export and should be low level, known by Transistor-Transistor Logic level characteristic, output terminal level should be less than 0.8V, and the R3 calculated accordingly should be 10K
left and right, experimental result shows that voltage, lower than 0.6V, meets level nature completely when exporting as low-voltage " 0 ".
Except structure described in the utility model, all the other are prior art.
The above is preferred implementation of the present utility model; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection domain of the present utility model.
Claims (4)
1. a wind speed measuring circuit, it is characterized in that, comprise incremental optical-electricity encoder, Schmidt trigger U1, resistance R1, resistance R2, triode Q1, optocoupler U2, resistance R3, two input ends of described incremental optical-electricity encoder connect 5V voltage and ground end respectively, the output terminal of described incremental optical-electricity encoder connects first pin of Schmidt trigger U1, second pin contact resistance R1 one end of described Schmidt trigger U1, the base stage of the other end connecting triode Q1 of resistance R1, the grounded emitter of triode Q1, the collector of triode Q1 connects second pin of optocoupler U2, first pin of optocoupler U2 connects 5V voltage by resistance R2, 3rd pin of optocoupler U2 connects 5V voltage by resistance R3, the 4th pin ground connection of optocoupler U2.
2. a kind of wind speed measuring circuit according to claim 1, is characterized in that, the model of described Schmidt trigger U1 is 74HC14N.
3. a kind of wind speed measuring circuit according to claim 1, is characterized in that, the model of described optocoupler U2 is 6N137.
4. a kind of wind speed measuring circuit according to claim 1, is characterized in that, described triode Q1 is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420464636.7U CN204044177U (en) | 2014-08-18 | 2014-08-18 | A kind of wind speed measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420464636.7U CN204044177U (en) | 2014-08-18 | 2014-08-18 | A kind of wind speed measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204044177U true CN204044177U (en) | 2014-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420464636.7U Expired - Fee Related CN204044177U (en) | 2014-08-18 | 2014-08-18 | A kind of wind speed measuring circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204044177U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588434A (en) * | 2020-12-22 | 2021-04-02 | 赣州好朋友科技有限公司 | Belt transmission protection circuit and intelligent sorting equipment |
-
2014
- 2014-08-18 CN CN201420464636.7U patent/CN204044177U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588434A (en) * | 2020-12-22 | 2021-04-02 | 赣州好朋友科技有限公司 | Belt transmission protection circuit and intelligent sorting equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20141224 Termination date: 20150818 |
|
| EXPY | Termination of patent right or utility model |