SU1690018A1 - Photorelay - Google Patents

Abstract

The invention relates to pulsed optoelectronic technology and can be used in information and robotic complexes of automation, industrial electronics, telemechanics and computer technology. The aim of the invention is the expansion of operational capabilities. This goal is achieved by introducing into the device the prototype of AND, OR elements and diodes, which allows the device to be implemented with the third state mode and ensure reception of information from optical channels regardless of the availability of information at the electrical inputs. These capabilities allow photocell to be used as bus multiplexers. 1 il.

Description

The invention relates to a pulsed optoelectronic technology and can be used in information and robotechnology complexes of automation, industrial electronics, remote control and computing.

The purpose of the invention is to expand the operational capabilities by introducing the third state mode and ensuring reception of information from optical channels regardless of the availability of information at the electrical inputs.

The drawing shows a block diagram of the photorelay.

The photo relay contains N output amplifiers -inverters 1, N resistors 2, N transistors 3, N optoelectronic elements 4, N diodes 5, N elements AND 6, first 7 and, second 0 elements OR, inverter U. power supply 10.

Photocell works as follows.

In the working state, the photo relay is driven by the input to the control Log.O.

The mode of information transfer is set by feeding Log.O to the mode input, while from the output of the element OR 8 to each of the optoelectronic elements 4 a low potential is supplied, which through the inverter 9 opens N elements 6, the signal Log.1 from the output of inverter 9 through the element OR 7 enters the emitters of N transistors 3, thus closing the latter.

The logic signals supplied to the information inputs pass through the elements And 6, diodes 5, excite optoelectronic elements 4, which emit information into the optical communication line.

The mode of receiving information is set by feeding Log.1 to the mode input and feeding Log.O to the control input, while the signal Log.1 passes through the OR element 8 and goes to the second terminals of the optoelectronic elements 4. From the output of the inverter 9, the signal Log.O closes N elements And 6, thereby preventing the influence of information that is on the ISO

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formational electrical inputs of the device. From the output of the element OR 7 to the emitters of the transistors 3 receives a low potential, allowing them to work. Optical fluxes affect the optoelectronic elements 4, cause the appearance of the base currents of the transistors 3 and, consequently, a change in the potentials on the collectors of the latter. In this case, the diodes 5 are in the closed state, protecting the signals arriving at the bases of the transistors 3 from being shunted by low output levels of the L 6 elements.

The output signals of the optoelectronic elements 4, inverted by the corresponding transistors 3, are re-inverted and amplified by the corresponding amplifiers-inverters 1 to the level of Log.1. Thus, the illuminated state of the optoelectronic elements 4 corresponds to the level of the log. G on the corresponding outputs of the photorelay. When a Level 1 control input is applied to the input, the emitters of the transistors 3 appear to have a high voltage level and they close. From the output of the inverter 9, the signal Log. O enters the input of N elements And b and closes them. The optoelectronic elements 4 from the output of the OR 8 element are supplied with the level of Log.1 and, thus, a third state is created, in which information is not transmitted, not received and no effect on the optical communication lines occurs.

The current through the optoelectronic elements 4 and the diodes 5 in the transfer mode can be limited by resistors in the collectors of the output transistors N elements And b, performed on the elements with an open collector (not shown).

Claims (1)

An invention of a Photorelay comprising a power source, an inverter, a transistor, a resistor, an amplifier-inverter, an optoelectric element, characterized in that, in order to expand its operational capabilities, it is equipped with two OR elements, a diode, an AND element, and the first output of the optoelectric element is connected to the base of the transistor, the collector of which is connected via a resistor to the power supply and to the input of the inverter amplifier, the output of which is the information output of the device, and the first input of the element AND the second input is connected to the first input of the first OR element, the output of which is connected to the emitter of the transistor, and the second input is connected to the control input of the device and the second input of the second OR element. the first input of which is connected to the input of the device mode, and the output is connected to the input of the inverter and to the second output of the optoelectronic element, the first output of which is connected to the cathode of the diode, the anode of which is connected to the output of the element I. south -I one