SU1305793A1 - Photoelectric relay - Google Patents

Abstract

The invention relates to a pulse technique and can be used in control systems. The purpose of the invention is to increase the reliability of photocell operation. It is achieved by the fact that in a photo relay containing a first light source (IC) 1, a first photodetector (F) 3, an amplifier 5, a delay element 9, a pulse generator (CI) 8, triggers 6, 7, an inverter 10, 11, a second IC 2, the second F 4, and the output of the second Ф 4 is connected to the amplifier 5 parallel to the output of the first Ф 3. Thus, two light channels are used, the output element of each of them is designed as triggers 6, 7. Since IC 1, 2 feed from one GI 8, then the stability of the photo relay through optical channels from interference is significantly increased. 2 il. W with Figure 1

Description

one

The invention relates to a pulse technique and can be used in control systems.

The purpose of the invention is to increase the commutation power.

FIG. 1 shows a photorelay circuit; figure 2 - timing diagrams when the sensors and the violation of their optical axis by the object.

The photorelay contains sources 1 and 2 of light, photodetectors 3 and 4, amplifier 5, first and second Dt-triggers 6 and 7, generator 8 pulses, delay element 9, first and second inverters 10 and 11 and limiting resistors 12 and 13 o

The photodetectors 3 and 4 are optically connected to the sources 1 and 2 of the light, connected in parallel to the amplifier 5, the output of which is connected to the first inputs of the first and second Dt-trigger 6 and 7. The output of the pulse generator 8 is connected to the delay element 9 through a limiting a resistor 13 to the light source 1 and through the first inverter 10 and a limiting resistor 12 to the light source 2. The output of delay element 9 is connected to the second input of trigger 6 and through the second inverter 11 to the second input of second trigger 7, the outputs of the first and second trigger 6 and 7 are the output terminals of the device.

As sources 1 and 2 and photoreceivers 3 and 4, the emitting diodes and photodiodes were used, respectively.

The device works as follows.

The pulses from the generator 8 (Fig. 2a) in the positive half-cycle of oscillations through the resistor 13 excite the light flux optically connected with the photoreceiver 3 in the light source 1, and in the negative half-period excite the light flux through the first InverTOO 10 (Fig. 2.6) and a resistor 12 in the source 2 of the light optically coupled to the photodetector 4. In this case, the oscillating half-period of oscillations delayed by delay element 9 (FIG. 2.9) of the generator 8 comes as clock pulses to the second input of the first trigger 6, at the first entrance, for example P information, which is supplied through an amplifier 5, a pulse signal with photorefractive topriemnika 3 (a logical level

five

ten

1305793 2

one). On the front of the clock signal from the delay element 9, a corresponding state of the photodetector 3 is recorded in the first trigger 6 (Fig. 2, g). Similarly, the clock pulse from the first inverter 10 (Fig. 2, d) records the status information of the photodetector 4 into the trigger 7 (Fig. 2, j).

When the photodetector 3 overlaps, for example, by detonating at time t (Fig. 2.3), the signal source of light from the photodetector is obscured. In this case, the light flux of the light source 1 and the output of the amplifier 5, respectively, is stopped, respectively, a logic signal -O appears, which is inputted by the corresponding clock pulses from element 9 into trigger 6.

Similarly, they work in the negative half-period, oscillations of the generator 8, the source 2 of the light and the photodetector 4 when the object interrupts their optical axis for a while;

f5

20

25

thirty

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t (figure 2, e). Since information is recorded in triggers 6 and 7 within a short time of exposure of the delayed edge of signals to a second input, for example, dynamic, and for the rest of the time, interference on triggers 6 and 7 is not recorded, the noise immunity of the photo relay over the information (optical) channel increases

T-2

in this case, n times.

with continuous photosensors, where T is the duration of the pulse period of the generator 8; cp-p is the duration of the switching pulse front (actually the switching time of the Dt-flip-flop),

At the same time, the proposed device is structurally simpler, since two photosensors acting autonomously use the same amplifier - generator. At the same time, the pulsed operating mode of the emitters improves the performance (range and reliability) of the photorelay while maintaining the potential nature of the signal at the photorelay outputs.

Claims (1)

Invention Formula The photorelay contains the first light source, the first photodetector, the amplifier, the delay element, the first Similarly, they work in the negative half-period, oscillations of the generator 8, the source 2 of the light and the photodetector 4 when the object interrupts their optical axis for a while; five 0 five 0 five 0 five t (figure 2, e). Since information is recorded in triggers 6 and 7 within a short time of exposure of the delayed edge of signals to a second input, for example, dynamic, and for the rest of the time, interference on triggers 6 and 7 is not recorded, the noise immunity of the photo relay over the information (optical) channel increases T-2 in this case, n times. with continuous photosensors, where T is the duration of the pulse period of the generator 8; cp-p is the duration of the switching pulse front (actually the switching time of the Dt-flip-flop), At the same time, the proposed device is structurally simpler, since two photosensors acting autonomously use the same amplifier - generator. At the same time, the pulsed operating mode of the emitters improves the performance (range and reliability) of the photorelay while maintaining the potential nature of the signal at the photorelay outputs. Invention Formula The photorelay contains the first light source, the first photodetector, the amplifier, the delay element, the first and a second output pins, a photodetector output connected to an amplifier input, characterized in that, in order to increase switching reliability, a pulse generator, first and second triggers, first and second inverters, a second light source, a second photodetector, the output of which is connected to the amplifier input is parallel to the output of the first photodetector, the amplifier output is connected to the D inputs of the first and second Triggers, the output of the pulse generator is connected to the input of the first light source and the input of the delay element directly, and to the input of the second light source through the first inverter, the output of the delay element is connected to the C input of the first trigger directly, and to the C input of the second trigger through the second the inverter, the outputs of the first and second triggers are connected respectively to the first and second output pins of the photo relay.