RU1798916C - Logical circuit excluding error logical signal at its output - Google Patents

Abstract

The invention relates to pulse technology and can be used in railway automation devices. SUMMARY OF THE INVENTION: the device comprises an OR-NOT element, each of which is configured with four optoelectronic switches, four rectifiers and two controlled generators. rectifiers are made in the form of a voltage doubling circuit, the second valve of which is LED; 1 tablet, 3 ill.

Description

The invention relates to: pulse three; ё: and can be used in various discrete devices (automatics,;;; /., -;: /;.,;; ,,., -:.; ....;, .:.-:-.AND ;: /-.- -.

An object of the invention is to increase reliability and enhance functionality. V; -;

The goal is achieved in that in a device that circulates the first, second and third logical 1 elements, the inputs of the first and second elements are connected to the device input 1, the third element is connected to the device outputs, additionally, the logic elements are made with dividing phsodap and logic signal outputs Г И d, . moreover, the outputs T and O of the first VI of the second element are connected) otiief seamlessly with the first and second inputs 1 and O of the third element, and contain the first, second, third and fourth optoelectronic keys, the inputs of which are connected to the inputs of the element, and the outputs are connected with inputs respectively of the first, second. Tpetbero and the fourth rectifier, the outputs of the first and third rectifiers are connected to the inputs of the first controlled generator, the outputs of the second and fourth rectifiers are connected to each other h with the input of the second controlled generator, the outputs of the controlled generators are connected to the outputs of the device The amplifiers are made in the form of an asymmetric voltage doubling circuit, the second diode of which is made LED.

: Execution of logic elements with optoelectronic keys allows spills; read the polarity of the applicants. to the input of the pulse signal device, it is easy to change the function of the logical element by switching the polarity of the input LED of the optoelectronic key (in Fig. 2, the element implements the function 2 OR NOT, if the inputs 15 are connected to the common wire), if 2 with a common wire inputs 14, 16, 18. 20). In addition, due to the use of devices, the logic element has higher noise immunity and the possibility of galvanic isolation of blocks and nodes. Execution of rectifiers asymmetrically "

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The double voltage double circuit allows controlling the operation of the optoelectronic switch when pulses of a certain polarity arrive at its input, converting them to a constant voltage of opposite polarity. At the same time, thanks to the fact that the second diode is made of LED, it emits light. When the pulse operation of the optoelectronic switch ceases, the LED does not light up, even if the first capacitor is rectified (broken). Thus, when performing rectifiers according to the voltage doubling circuit using an LED, we obtain a reliable indication of the pulsed operation of the elements of the device and the conversion of pulses of one polarity to a constant voltage of another polarity only when all the elements are operational. This makes it possible to increase the reliability and controllability of the device. All highly reliable discrete automation devices that exclude a false output signal and are made on integrated circuits or microprocessors (for example, railway automation devices and telemechanics) operate in a pulsed mode and their output signals have the form of a pulse sequence. The inventive device easily interfaces with such discrete automation devices. And can play the role of a control element in various cases of duplication and redundancy of equipment.

The execution of logic elements with separate inputs and outputs of logical signals 1 and 0 increases the security of the device from false signals at the output when the elements are damaged and the wires are connected. A known logical element by A.S. No. 915238, cl. H 03 K 19/02. But this element is designed for constant voltage input signals and therefore it cannot be used as a control body when duplicating highly reliable automation devices operating in a pulsed mode. In addition, this device has the ability to generate a false signal at the output of the device when the inputs of the element communicate with the power buses, because the output of the element preceding the considered one has a much greater internal resistance (as determined by the isolation resistors 14, 15) than the internal resistance of the positive or negative polarity power supplies. 8 of the prototype device when combinations 01 or 10 appear at its inputs

generator 1. works, but this cannot happen, because the bipolar signals at the inputs of the device are compensated at resistors 18 and 19, and the voltage of O will be on the capacitor of generator 1. Generator 1 will only work with a combination of input 00 (i.e., positive voltage at both inputs).

Thus, the claimed device

0 thanks to a new set of features, it was possible to easily change the logical function, increase the noise immunity, reliability and controllability of the logical element, facilitate docking

5 it with discrete automation devices that do not allow a false signal at the output.

In accordance with the foregoing, the distinguishing features of the claimed device are essential, and the positive effect of expanding the functionality and increasing the reliability of the device is achieved by using the totality of the essential features of the invention.

Figure 1 presents a schematic diagram of a device consisting of logic elements 1, 2, 3. Inputs of elements 1, 2

0 are connected to the inputs of the device, and their outputs are connected to the inputs of element 3, the outputs of which are connected to the outputs of the device.

The device eliminates the possibility

5 false signals at the output, i.e. the possibility of the transition of logical O to 1 and, conversely, in the case of using bipolar pulse signals, for example, when logical 1 is assigned pulse signals of negative polarity, logical O - pulse signals of positive polarity. Damage to the elements of the device only lead to failure

5 of the logic signal at the output (the absence of pulses or the appearance of a constant voltage), which is an alarm signal and from which the subsequent elements do not work.

0 Fig. 2 is a schematic diagram of a logic element consisting of optoelectronic keys 4-7, the inputs of which are inputs of the device, and the outputs are connected to the inputs of rectifiers 8-11,

5, the outputs of rectifiers 8, 10 are connected to the inputs of the first controlled generator 12, the outputs of rectifiers 9. 11 are connected to each other and to the input of the second controlled generator 13, outputs 37 and 39, respectively, of the first generator 12 and second

generator 13 are the outputs of the device.

The device (Fig. 1) implements the function Y (xiVx2) (X3VX4) if the inputs 15, 17, 19, 21 of the logic elements 1, 2, 3 are connected to a common wire. Inputs 14 and 18 of logic elements 1, 2, 3 are in this case inputs O, inputs 16, .20 inputs 1, output 37 - output 1, and output 39 - output O. When connecting inputs 14, 16, 18, 20 logical elements 1,2,3s with a common wire, the device implements the function Y xi. X2 Vxs X4 (FIG. 3).

The device (Fig. 1) works as follows.

The inputs 14 or 16.18 or 20 elements 1,2 receive logic signals xt, X2, xs; X4. When pulsed signals of positive polarity (0) are received at the inputs 14 and 18, the transistors of the optoelectronic switches 4, 6 open and close in the pauses between pulses. When the transistors of the optoelectronic switches 4, 6 are closed, the capacitors 22, 29 of the rectifiers 8 are charged; 10, and when the key transistors 4, 6 open, the capacitors 22, 29 through the LEDs 24; 31 are charged to the capacitors 25.32. When the switches 4, 6 are switched periodically and the rectifiers 8, 10 are operational, the LEDs 24, 31 light up. Thus, the rectifiers 8, 10 convert pulse signals of positive polarity to a constant voltage of negative polarity. In this case, the generator 12 is excited, at its output 37 pulsed signals of negative polarity (1) appear relative to the common wire 38. If there is no signal O at one of the inputs 14 or 18, the generator 12 is not excited and there are no pulses at its output 37 negative polarity. At the same time, one of the inputs of 16 or 20 optoelectronic switches 5.7 shows pulsed signals of negative polarity. When the key transistors 5.7 are periodically switched, the LEDs 28 or 35 of the rectifiers 9, 11 light up, and a positive voltage is generated on the capacitor 36. In this case, the generator 13 is excited, at its output 39 pulsed signals of positive polarity (O) appear relative to the common wire 38. Thus, each of the logic elements 1,2,3 implements the function 2 ILINE.

In accordance with the input signals at the inputs 37 or 39 of the elements 1, 2, logic signals appear that are input to the inputs 14 or 16, or 20 of the elements 3,

at the outputs 37 or 39 of which a logic signal is generated, respectively, of the function Y (xiVx2) (xxUx), implemented by the entire device.

Rectifiers 8, 9, 10, 11 contain capacitors 25, 32, 36 with four terminals, which are necessary so that when any of its terminals breaks, the constant voltage at the output of the rectifiers disappears. Thus, the disconnection of the capacitors 25, 32, 36 will not cause, as in the case of a conventional capacitor, the passage of the high-frequency components of the rectification signals to the output of the logic element circuit.

Damage to the elements of the device leads to the disruption of high-frequency oscillations of the generators 12, 13 and, as a result, to the loss of pulse signals at the output of the logic element. If the keys 4, 5, 6, 7 fail (cessation of pulse operation) or breakdown of the capacitors 22, 26, 29, 33 and the breakage of the diodes 23, 27, 30, 34 of the rectifiers 8, 9, 10, 11, the LEDs 24, 28, 31 , 35 is not lit because they are switched in the opposite direction with respect to the power sources supplying the optoelectronic switches. That is, if damaged. optoelectronic keys 4, 5, 6, 7 or rectifiers 8,9, 10,11 there is no LED indication of the status of the inputs of the element, which increases the controlability of the element.

Thus, none of the circuit damage leads to the appearance of an O signal instead of signal 1 on the output and vice versa .;

The circuit of one of the 1, 2, 3 logic elements 2 AND LY-NOT can be considered as a result of minor changes can be converted into circuits of other logical elements. Indeed, a change in the polarity of the input diodes of the optoelectronic switches 4, 5, 6, 7 (inputs 14, 16, 18, 20 connected to a common wire) converts the OR-NOT gate to I.

When combining inputs 14 and 18, 16 and 20, the OR gate is converted to the NOT gate. Replacing the transistors in the optoelectronic switches 4, 5, 6, 7 and in the generators 12, 13 with transistors with a different type of conductivity (eg: p to pn-p and vice versa) and changing the polarity of the switching of the rectifier diodes leads to the conversion of the OR element -NOT IN OR. If, in addition, the polarity of the connection of the diodes of the optoelectronic switches 4-7 is changed, the OR-NOT element is converted & AND NOT.

The use of the invention is contemplated in railway devices. automatic devices that prevent the occurrence of false signals and ensure the safety of train traffic.

The proposed device is more reliable and has wider functional possibilities (higher noise immunity, controllability, easier to change the logical function of the element, it is easier to dock with discrete automation devices that do not allow a false signal at the output) than the prototype device; ; -.- V -. -:. ; .-. /:.; . ::

Claims (1)

SUMMARY OF THE INVENTION A logic device eliminating a false logic output signal containing first, second, and third logic elements, the inputs of the first and second elements are connected to the device inputs, the outputs of the third element are connected to the device outputs, including the fact that, in order to increase the reliability of operation and suitability, the logic elements are made with separate inputs and outputs of logical signals 1 and O, and the outputs 1 and O of the first and second elements are connected respectively to the first and second inputs 1 and O of the third element, and contain the first, second, third and fourth optoelectronic keys, the inputs of which are connected to the inputs of the element, and the outputs are connected to the inputs of the first, second, third and fourth rectifiers, respectively, the outputs of the first and third rectifiers she joined. with the inputs of the first controlled generator, the outputs of the second and fourth rectifiers are connected to each other and with the input of the second controlled generator, the outputs of the first and second generators are outputs of the elements, the rectifiers are made in the form of an asymmetric voltage doubling circuit, the second valve of which is made LED light. The health table of the ZILITNYO element (for the indicated types of logical signals.: .. -: -: -; -. - -. Fishing) has the form: ...-. ; -:.: .. - .. .-. -; / - -:., - .. -: ( / t) 3 | 1 v : HV "2l J X") . {:.  {- {fe Editor Compiled by O. Dreiman Tehred M. Morgenthal -L pxjxtvxft DU2.3 Corrector A..Kozoriz