SU758582A1 - Redundancy pulse generator - Google Patents

Description

The invention relates to pulsed technology and automation and can be used in the implementation of technical means of digital automation, for example, in control systems where the generation of electrical oscillations with increased reliability and control is required.

A pulse generator is known, for example, containing two master oscillators, the output of one of which is connected to the first inputs of the first and second triggers, the outputs of which are connected via AND-OR-NOT logic elements to the inputs of the output trigger, '' and an additional inverter and delay element, whose input is connected to the output of the second master oscillator and to the second input of the first trigger, and through the inverter with the second ^ί inputs of AND-OR-NOT logic elements, the output of the delay element is connected to the second input of the second trigger G1]. 25

This generator has low stability of the output pulses, since the frequency of the output signals is determined by the frequency difference of the two master oscillators. A redundant generator is also known, containing the main and backup channels, each of which includes a generator, a power switch, multi-input OR elements, a multi-input AND element, a pulse counter, an additional pulse counter, a control counter, control keys, each of which is turned on respectively, between one of the outputs of the generator of the main and backup channels and the input of the multi-input OR element, control keys, an additional OR element, and an additional AND element (2}.

The disadvantages of this generator are the complexity of the device, a large number of blocks, and the use of multi-output master oscillators.

The prototype of the invention is a redundant pulse generator Щ.

The known generator contains two separate pulse generators, an integrator, the input of which is connected to one of the inputs of the coincidence unit, a trigger with separate inputs, and a switch. The outputs of the individual pulse generators and the trigger output are connected to the inputs of the switch.

753582

The disadvantages of the known pulse generator are the long recovery time and the absence of an alarm when both generators fail. Indeed, let at the moment a failure occurs, for example, of the first generator. The integrator switches the trigger and there will be clock pulses from the second generator at the output of the switch. But they won’t go to the output of the coincidence block until the resolving signal appears on the integrator, for the formation of which a certain time is needed, which is determined by the integration time of the initial pulse sequence. If the generators fail, there is also no fault signal for the pulse generator.

The aim of the invention is to reduce the recovery time in case of failure of any of the generators and the expansion of functionality, i.e. simultaneous monitoring of the operability of both generators.

This goal is achieved by the fact that in a redundant pulse generator containing two pulse generators, an integrator, a switch, a coincidence unit and a trigger, the input of the integrator connected to the first generator and the first input of the switch, and the output to the second input of the switch, the output of the switch connected to the first the input of the coincidence unit, the second input of the coincidence unit is connected to the trigger output, a second integrator, an AND element and a delay element are additionally introduced, while the outputs of the integrators are connected to the inputs of the And element E Yield AND-NO element is connected to one input of the trigger, the other input of flip-flop connected to the output of the delay element and the delay element input coupled to an output 'switch, the third and fourth inputs which are respectively connected to the input and output of the second integrator.

The invention is illustrated by the structural diagram of a redundant pulse generator.

The proposed redundant pulse generator contains generators 1 and 2, integrators 3 and 4, com. mutator 5, AND-NOT element b, delay element 7, trigger 8, coincidence block 9.

The outputs of the generators 1, 2 are connected to the inputs of the integrators 3, 4 and the switch 5. The outputs of the integrators 3, 4 are connected to the inputs of the switch 5 and the AND-NOT element b. The first input of trigger 8 is connected to the output of the NAND 6 element, and the second input of trigger 8 is connected to the output of the delay element 7, whose input is connected to switch 5. Match block 9 is connected to the outputs of trigger 8 and switch 5. In the initial state, both work generator 1 and 2. Pulses of clock frequencies integrated by integrators 3, 4 and converted into control signals are fed to switch 5, which passes one of clock frequencies to the input of coincidence unit 9.

If any generator 1 or 2 fails, the output signal of the corresponding integrator 3, 4 disappears, and switch 5 switches generators 1, 2. The switching time is determined only by the speed of switch 5 and coincidence block 9 and does not depend on the integration time, since for each The generator has a separate integrator.

If both generators fail during operation, then enable signals from both integrators will disappear, which, through the AND-NOT element, will trigger Trigger 8. The signal from the output of Trigger 8 will turn off coincidence block 9, at the same time, this Signal is used to indicate a complete failure of the pulse generator. Installation’s trigger 8 in the initial state occurs when the pulses are powered up from the switch through the delay element 7.

The work of the switch is controlled by integrators 3, 4 of the main and backup channels. Trigger 8 in this generator monitors the malfunction and controls the operation of coincidence unit 9.

The proposed technical solution allows to reduce the recovery time of the redundant pulse generator, increases the scope, where interruptions in the clock frequency are unacceptable, for example, in control systems, in memory devices with dynamic storage of information. The increased reliability of the proposed generator and the ability to control a complete failure allows you to install one generator on the entire control system.

Claims (3)

1. USSR author's certificate number 525231, cl. H 02 C 3/64, 1975, 2. The author's certificate of the USSR 529541, cl. H 03 K 1/00, 1975. 3. Authors certificate of the USSR 526056, cl. H 03 K 1/00, 1975. VyzvZ KOHmpaAk