SU945856A1 - Redundancy pulse generator - Google Patents

Description

(5) RESERVED PULSE GENERATOR

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This invention relates to automatics and computing and can be used in computer systems with increased reliability.

A redundant pulse generator is known, containing the first and second generators, failure indicators and a switch consisting of the trigger of two two-input AND elements and the OR, Outputs of each generator, Q are connected to the first inputs of the two-input AND elements, and with The inputs of the failure indicators, the outputs of which are connected respectively to the 5 R and S trigger inputs, are the control inputs of the switch. If one of the generators fails, the switch connects to the device output second generator tl.go

The disadvantage of this device is the possibility of distorting the shape and duration of the output pulse due to the fact that

(switching) of the switch in case of failure of one generator is not synchronized with the pulse front of the second generator.

A redundant generator is also known, comprising a main and a backup generator, a failure indicator consisting of an integrator, and a subtraction unit of the first pulse of the pulse train. The generator output is connected to the first input of the subtraction unit of the first pulse of the sequence, the second input of which is connected to the output of the backup generator. A disadvantage of this device is the complexity of the node to subtract the first pulse of the sequence.

Claims (3)

The closest to the invention in its technical nature is a redundant generator, containing a main and a backup generator, an indicator of the main generator and a switch consisting of two two-input elements I. The outputs of which are connected to the inputs of the OR element, the output of which is the output of the device. The first inputs of the AND elements are informational and are connected to the outputs of the generators, and the second inputs (control) are connected to the direct and inverse outputs of the failure indicator of the new generator. If the main generator fails, the switch is connected to the output of the standby generator GZO. The disadvantage of this redundant generator is the possibility of distorting the first one (after switching to a backup generator of an output pulse). The aim of the invention is to prevent distortion of the first output pulse after switching from the main generator to a backup generator. This goal is achieved by THAT in a redundant pulse generator containing the main and backup pulse generators, the switch and the failure indicator, whose input is connected to the output of the main pulse generator, and the first input is connected The first and second information inputs of which are connected respectively to the outputs of the main and backup pulse generator are additionally introduced as a trigger and element NOT, the input of which is connected to the output of the backup pulse generator, and the output to the C- the trigger output, the S input of which is connected to the second output of the fault indicator, the input of which is connected to the logical zero bus, and the inverse output connected to the second control input of the switch-. The drawing shows the functional scheme of the proposed generator. The redundant generator contains the main generator of 1 pulses, a failure indicator 2, registering the failure of generator 1, switch 3, switch output bus, trigger 5, first element KE 6 ,. bus 7 logical O, Indicator 2 consists of two integrators 8 and 9 of the second 10 and third 11 elements and NOT the element NOT 3.1. Switch 3 contains the first, second 13 and second 1 elements AND and the output element IS 15. The redundant generator also contains backup generator 1b pulses. The generator works as follows. With a good main generator 1, both .integrators 8 and 9 emit single signals, and indicator 2 outputs a signal of logical 1 at the first output, and a logical signal of O at the second output. As a result, pulses are transmitted to the output of switch 4, which is the output of the device Oscillator 1. In this case, the pulses of oscillator 16 will be blocked by trigger 5, which is in single unit when the main generator 1 is operating. This state of trigger 5 is supported by a logic 0 signal supplied from the output of the indicator. 2 to asynchronous 5-in; one trigger 5. If generator 1 fails, a constant will take place at its output -. level. (either logical 1 or logical O). This will lead to the fact that the integrators 8 and 9 will give out different signals, and the output signals of the indicator 2 with the help of the elements AND-NO 12 and NOT 11 will be / are reversed. This in turn will lead to the fact that the main generator 1 will be disconnected from the output, the switch. At the same time, at the 5-input of the trigger 5, the signal of the logical M is set. Starting from this point in time, the first pulse of the backup generator 16 with the help of the HE element 6 will set the trigger 5 to the state O with its falling edge and will prepare the switch 3 to pass to the output the rest of the pulse series from the output of the backup generator 16. Thus, the 1st redundant pulse generator prevents the appearance of a distorted output pulse by blocking the First unformed pulse of the sequence when connected rvnogo gene | Ator to the device output. This enhances the quality of operation of the redundant generator and eliminates the possibility of a computer system failing due to unformed output clock. Claims of the invention Redundant pulse generator. the main and backup pulse generators, the switch and the failure indicator, whose input is connected to the output of the main pulse generator, and the first output is connected to the first control input of the switch, the first and second information inputs of which are connected respectively to the outputs of the main and backup pulse generators, characterized in that, in order to prevent the distortion of the first output pulse after switching from the main pulse generator to the backup pulse generator, a trigger is additionally introduced into it and the element, whose input is connected to the output of the backup pulse generator, and the output is connected to the C-input trigger9 (6 ra, the S-input of which is connected to the second output of the fault indicator, the 6th input is connected to the logical zero bus, and the inverse output is connected to the second control input of the switch. Sources of information taken into account during the examination 1. Japan and Japan 52-22219, Cl. 97 (7) Q 12, published in 1977. 2. USSR author's certificate number 579620, cl. Q 06tP 11 / 00,197. 3. USSR author's certificate for application No. 2683050 / 18-2t, cl. G About R 11/00, 1978 (prototype.