CN2046695U

CN2046695U - Emitting and receiving device of photoelectric controller

Info

Publication number: CN2046695U
Application number: CN 88208321
Authority: CN
Inventors: 程嵩岳; 李建容
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-07-08
Filing date: 1988-07-08
Publication date: 1989-10-25

Abstract

The utility model relates to an emitting and receiving device of a photoelectric controller used in environment with stronger flicker disturbance light in background, comprising an emitting part and a receiving part. The utility model is characterized in that the control light sent out by the utility model uses a certain fixed frequency which is much higher than the flicker frequency of the disturbing light to modulate. The receiving part adopts triple measures of band-pass filtering, amplitude discrimination shaping and counting frequency discrimination to the electrical signal conversed from the optical signal received by a light-sensitive device, which not only eliminates the disturbance of the constant or gradually varied light in the background but eliminates the flicker disturbance in the background so that the photoelectric controller works reliably.

Description

Emitting and receiving device of photoelectric controller

The device that transmits and receives of photoelectric controller belongs to sensor device, is used for automation control appliance.

The photoelectric controller that under the environment of light of having powerful connections, uses, for the modulate emission mode is generally all adopted in the interference that prevents bias light, common modulator approach be make sudden strain of a muscle that luminescent device sends a certain frequency frequently light, receive light-sensitive device partly the flashing light that receives be converted to alternate electrical signal after, the amplification of the AC amplifier of closing through the stopping direct current lotus root, again according to AC signal have or not or the amplitude size realizes the purpose of photo-electric control.But this method can only be got rid of invariable or change the interference of bias light slowly, when containing the passage of scintillation light of certain frequency in the bias light, just can produce receiver and disturb and misoperation.

Task of the present utility model is a kind of device that transmits and receives of design, makes it can get rid of the interference of the passage of scintillation light in the environment for use background.

The emission of this device partly is made of modulator and luminescent device, and modulator can be made up of vibration and drive circuit.For the ease of taking interference protection measure, the frequency of oscillating circuit answers the flicker frequency of high level cadre's ambient interferences light more than three times.The flash of light that the output signal of oscillating circuit makes luminescent device send certain intensity through overdrive circuit is as the control signal light source.If oscillating circuit itself has enough load capacity, can not establish drive circuit in addition.

The reception of this device partly is made up of light-sensitive device, band pass filter, amplifier, amplitude discrimination reshaper, counter, integrator and oscillator.After flashlight and the various stray lights of background project on the light-sensitive device, just be converted to the signal of telecommunication that contains multiple radio-frequency component.In order to distinguish control signal, exclude the interference signal, adopt band pass filter to carry out frequency-selective filtering earlier, the ambient interferences signal lower to frequency suppressed.Because high performance filter design and making are all difficult, filter are not done too high requirement here, therefore, still can not get rid of interference reliably in filtered signal, also must take more reliable frequency-selecting measure.For this reason, earlier filtered signal is suitably amplified (also can before filtering, amplify), again by Schmidt circuit amplitude discrimination and shaping, make the complete filtering of the less interference signal of amplitude, the signal that amplitude is bigger then becomes the constant amplitude square wave, then, send square wave to a rolling counters forward, simultaneously, give counter zero setting with the one-period burst pulse again, when the frequency of quenching pulse is not less than the flicker frequency of interference signal and is lower than radiative modulating frequency, just can make counter produce carry output when only receiving control signal, and the lower interference signal of frequency can not make counter produce carry pulse, has so just played the effect of counting frequency discrimination.Differentiate having of counter carry pulse with integrating circuit and voltage comparator again and do not have, just can distinguish control signal and interference signal reliably.When interference signal has multiple radio-frequency component and intensity big, as long as choose the modulating frequency and the emissive porwer of emission suitably, choose counter quenching pulse frequency, the system and the output figure place of return difference sum counter of multiplication factor, the Schmidt trigger of the passband width of filter and Q value, amplifier rationally is set again.Can reach and get rid of the purpose of disturbing.The quenching pulse of counter is obtained after can utilizing the output signal frequency division of launching the part oscillator, also can be provided by an independent oscillator.

The principal character of this device is that the various signals to the output of light-sensitive device have carried out filtering, amplitude discrimination shaping and three frequency-selectings of counting frequency discrimination.Can get rid of interference effectively, compared with prior art, circuit is simple, and reliable operation is adapted at the environment work down of complicated background stray light.

The circuit of an embodiment of the present utility model as shown in drawings.Among the figure with integrated circuit J1 and luminescent device BG1 be core constituted device emission partly.J1 and peripheral cell thereof are formed a square-wave oscillator, and its output is launched the control light signal through resistance current limliting driven for emitting lights device BG1.

Circuit among the figure except that emission partly is to receive part, and the various light signals that light-sensitive device BG5 will receive are converted to the signal of telecommunication, for filter match, be provided with the emitter follower that constitutes by BG4 therebetween.Filter is made of A1 and two operational amplifiers of A2 and peripheral cell thereof, and its passband central frequency is identical with radiative modulating frequency or close.Filtered signal is given Schmidt trigger amplitude discrimination and the shaping that is made of A4 after A3 amplifies, signal after the shaping is sent to the counting input end of counter J3, the square wave of emission part oscillator J1 output is delivered to the zero setting end of J3 behind the J2 frequency division, the high bit output of counter is added to the base stage of triode BG2 through integrating circuit.Control discharging and recharging of another integrating circuit, make output element by BG3 at last, control other circuit.

In this circuit, in order to make filter disturbing pulse is had good inhibitory effect, radiative modulating frequency should than the sudden strain of a muscle of ambient interferences light frequently Senior Three doubly more than.The quenching pulse frequency of counter should be not less than the flicker frequency of stray light, and the system number of counter should be not less than modulating frequency and disturb color break-up ratio frequently.For example, when the strobe light that 100HZ is arranged in the background of environment for use disturbs, modulating frequency is chosen as 1000HZ, J2 and J3 can use the 211 decade counter, and the quenching pulse frequency of J3 is 100HZ, like this, after light modulated enters reception partly, the output Q3 of J3 has two pulse outputs in each count cycle, and when having only stray light to enter, the Q3 end does not just have pulse output.

The power supply that this circuit uses does not draw in the drawings.

Claims

1, photoelectric controller transmits and receives device.Emission partly is made up of modulator and luminescent device.Receive partly and constitute by light-sensitive device, amplification and frequency selection circuit.It is characterized in that radiative modulating frequency is higher than the flicker frequency of stray light in the environment for use background more than three times.Receiving frequency selection circuit partly is made of with the counting frequency discriminator band pass filter and amplitude discrimination reshaper.

2, photoelectric controller according to claim 1 transmits and receives device, it is characterized in that: the passband central frequency of band pass filter is identical with radiative modulating frequency or close, and the passband width value is less than the difference of emission light modulation frequency and ambient interferences optical flare frequency.

3, photoelectric controller according to claim 1 transmit and receive device, it is characterized in that the amplitude discrimination reshaper is made of Schmidt trigger.

4, photoelectric controller according to claim 1 transmits and receives device, it is characterized in that, the counting frequency discriminator is made of greater than counter and a burst pulse source of 3 system, clock acts on the zero setting end of counter, its frequency is not less than the flicker frequency of ambient interferences light, but is lower than radiative modulating frequency.