CN204044179U - A kind of wind direction metering circuit - Google Patents

Abstract

Wind direction metering circuit of the present utility model comprises absolute optical encoder, Schmidt trigger U4, resistance R4, resistance R5, triode Q2, optocoupler U4, resistance R6, two input ends of described absolute optical encoder connect supply voltage and ground end respectively, the output terminal of described absolute optical encoder connects first pin of Schmidt trigger U4, second pin contact resistance R4 one end of described Schmidt trigger U4, the base stage of the other end connecting triode Q2 of resistance R4, the grounded emitter of triode Q2, the collector of triode Q2 connects second pin of optocoupler U5, first pin of optocoupler U5 connects supply voltage by resistance R5, 3rd pin of optocoupler U5 connects supply voltage by resistance R6, the 4th pin ground connection of optocoupler U5.This device stability is high, can realize the high-acruracy survey within the scope of wind direction 0-360 °.

Description

A kind of wind direction metering circuit

Technical field

The utility model relates to a kind of metering circuit, specifically a kind of wind direction metering circuit.

Background technology

The wind resource of China is very abundant, the mean wind speed in most area all at more than 3 meters per second, particularly northeast, northwest, southwest plateau and offshore islands, mean wind speed is larger; Some places, the time of 1 year more than 1/3rd is all strong wind sky.In these areas, wind-power electricity generation is up-and-coming.Especially energy shortage at present, when wind-power electricity generation becomes modish generation mode, to the measurement of wind direction with control particularly important.

Early stage measuring 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 direction metering circuit, adopts the circuit design of photo-electric, can realize the high precision of wind direction, measure in real time on a large scale.

The utility model is by the following technical solutions: a kind of wind direction metering circuit, it is characterized in that, comprise absolute optical encoder, Schmidt trigger U4, resistance R4, resistance R5, triode Q2, optocoupler U4, resistance R6, two input ends of described absolute optical encoder connect supply voltage and ground end respectively, the output terminal of described absolute optical encoder connects first pin of Schmidt trigger U4, second pin contact resistance R4 one end of described Schmidt trigger U4, the base stage of the other end connecting triode Q2 of resistance R4, the grounded emitter of triode Q2, the collector of triode Q2 connects second pin of optocoupler U5, first pin of optocoupler U5 connects supply voltage by resistance R5, 3rd pin of optocoupler U5 connects supply voltage by resistance R6, the 4th pin ground connection of optocoupler U5.

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 direction metering circuit, by the fast processing to signal, by wind direction and be converted into exact figure, can realize, to the measurement of wind direction within the scope of 0-360 °, individual pen auto zero can being realized when multipurpose rotary.

Accompanying drawing explanation

Fig. 1 is theory structure schematic diagram of the present utility model.

Embodiment

A kind of wind direction metering circuit as shown in Figure 1 comprises absolute optical encoder, Schmidt trigger U4, resistance R4, resistance R5, triode Q2, optocoupler U4, resistance R6, two input ends of described absolute optical encoder connect supply voltage and ground end respectively, the output terminal of described absolute optical encoder connects first pin of Schmidt trigger U4, second pin contact resistance R4 one end of described Schmidt trigger U4, the base stage of the other end connecting triode Q2 of resistance R4, the grounded emitter of triode Q2, the collector of triode Q2 connects second pin of optocoupler U5, first pin of optocoupler U5 connects supply voltage by resistance R5, 3rd pin of optocoupler U5 connects supply voltage by resistance R6, the 4th pin ground connection of optocoupler U5.

The corresponding numerical code determined in each position of absolute type encoder, therefore its indicating value is only relevant with the initial sum final position measured, and has nothing to do with the pilot process measured.Select absolute optical encoder herein, its signal exported can be binary-coded decimal, can directly be accepted by single-chip microcomputer, sensitivity also very high than resistance sensor use more convenient (for this reason, herein in-kind portion may from be designed with different).And absolute type encoder has a zero reference point, wind direction requires that individual pen is measured, scope is in 0-360 °, so can reset to the measurement result of often enclosing with zero reference point, export reset signal to single-chip microcomputer, even if power-off or other reasons cause measurement delay also not affect, because his measurement result is only relevant with the position of front and back.

Schmidt trigger is the one of MOS trigger, and be mainly used in waveform conversion, in wind direction and measuring wind speed module, the model of employing 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 U5 is connected single-chip microcomputer.

According to the principle of work of absolute optical encoder, scrambler is the sensor directly exporting digital quantity, absolute optical encoder output low level, oppositely high level is obtained through 74HC14N phase inverter, Q2 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 R5 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 R6 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 direction metering circuit, it is characterized in that, comprise absolute optical encoder, Schmidt trigger U4, resistance R4, resistance R5, triode Q2, optocoupler U4, resistance R6, two input ends of described absolute optical encoder connect supply voltage and ground end respectively, the output terminal of described absolute optical encoder connects first pin of Schmidt trigger U4, second pin contact resistance R4 one end of described Schmidt trigger U4, the base stage of the other end connecting triode Q2 of resistance R4, the grounded emitter of triode Q2, the collector of triode Q2 connects second pin of optocoupler U5, first pin of optocoupler U5 connects supply voltage by resistance R5, 3rd pin of optocoupler U5 connects supply voltage by resistance R6, the 4th pin ground connection of optocoupler U5.

2. a kind of wind direction metering circuit according to claim 1, is characterized in that, the model of described Schmidt trigger U1 is 74HC14N.

3. a kind of wind direction metering circuit according to claim 1, is characterized in that, the model of described optocoupler U2 is 6N137.

4. a kind of wind direction metering circuit according to claim 1, is characterized in that, described triode Q1 is NPN type triode.