SU743202A1 - Redundant three-channel pulse generator - Google Patents

Description

The invention relates to radio engineering and automation and can be used when building highly reliable generators in automatic systems. A redundant generator is known that contains reference oscillators connected to the inputs of the frequency dividers, the outputs of which are connected to the inputs of the matching elements and through, the first OR element and the majority element - with the inputs of the inhibiting element, whose outputs are connected to the inputs of the second element OR, and to the inputs of the switch, the other inputs of which are connected to the outputs of the reference generators, and the output of the third element OR is connected to the inputs of the switch Frequency 1 drives. A generator lack is the absence of the corresponding channel disconnection when the frequency of its reference oscillator, i.e. at the moments of transition of the reference oscillator to the other-harmonic generation mode. The closest to the technical essence of the invention is a redundant three-channel pulse generator containing three independent channels, each of which has an AND element, a crystal oscillator connected to a frequency divider, a voltage converter, an inhibit element and an OR element, a converter output voltage of the second channel is connected to the inputs of the fourth and fifth prohibition elements, the second input of the fourth element of the prohibition is connected to the voltage converter of the first channel and its output is with the OR elements of the first and second channels, the second input of the fifth prohibition element is connected to the voltage converter of the third channel, and its output is to the OR element of the third channel 2. The disadvantages of the redundant generator are that of the first generators with respect to the third or stall of generation, the remaining generator does not ensure the presence of a pulse sequence at the output of the switch, as well as in that there is no independent automatic control of the frequency of the quartz gene Ator When coasting or at the transition frequency f at other harmonics (transition to THER peculiar harmonic generators having quartz resonators). It also reduces the reliability of the device.

The purpose of the invention is to increase the reliability and expand the range of application of the generator, in particular the provision of independent automatic control of the frequency of each generator during its run-down.

The goal is achieved by the fact that the redundant three-channel pulse generator contains a source of clock pulses and in each channel a trigger, the first inputs of which are connected to the source of the clock. pulses, in each channel the output of the frequency divider is connected via a trigger to one input of an element, the second input of which is connected to the output of a crystal oscillator of this channel, the output of element AND of the first channel is connected to the corresponding inputs of the voltage converter, element OR of this channel, prohibitory element of the second channel and the fifth prohibition element, the output of the AND element of the second channel is connected to the corresponding inputs of the voltage converter, the OR element of this channel and the prohibition elements of the first and third channels, you od AND gate of the third channel is coupled to respective inputs of the converter voltage, the OR of its channel and a fourth element prohibition clock generator outputs connected to inputs of the synchronization frequency dividers each channel.

The drawing shows a block diagram of a redundant three-channel pulse generator.

The redundant pulse generator contains quartz oscillators 1-3, dividers 4-6 frequencies, triggers, elements 10–, 12 and, converter 13–15 pulsed voltage to constant, first, VTOR9Y and third prohibition elements 16–18, elements 19 - 21 OR, the fourth and power Elements of the prohibition 22 and 23, the source of 24 pulses of 1 pulses, counters 25 - 27, triggers 28 - 30 overflow, the outputs of 31-33 geyrator channels.

Redundant three-channel pulse generator operates as follows.

A 24 clock pulse source generates pulses with a logical

level

that come on

counters 25 - 27 dividers 4-6 frequencies, short pulses generated on the falling edge of pulses with

which are the wild level

step on the triggers 7 - 9 with the input logic And, and short pulses generated on the leading edge of these same pulses, coming on the triggers 28 - 30 overflow divisors J 4 - b frequency. In the normal state, the generators 1-3 generate pulses, which are fed to the counters 25-27 dividers 4-6 frequencies and the elements 10-12 and respectively. In the absence of frequency overruns from the outputs of the triggers 7-9, the elements 10-12 and the resolution signals arrive in the form of logic triggers 7-9 are in a single state. Next, the pulses of the generators 1-3 pass through the corresponding elements 10-12 and enter the converters 13-15 of the pulse voltage into a constant voltage. The constant voltage is applied to 0 bar elements 16-18, 22-23, respectively. This ensures the arrival of generator pulses 1 through element 19 OR to the load connected to output 31 of the first 5 channel, generator 2 pulses through element 20 OR to the load connected to output 32 of the second channel, generator 3 pulses through element 21 OR to the load, connected to the output 33 of the third channel.

The frequency sweep of oscillators 1-3 is controlled in the following sequence. Counters 25-27 are filled with pulses of the respective c generators 1-3 for a time that is determined by the duration of the pulses t; with a logic level of the clock generator 24, At generator frequencies 1–3 corresponding to the nominal, overflow of counters 25–27 in time C will not occur and triggers 28–30 will remain in the original zero state, C outputs of trigger 28–30 overflow to the inputs of 5 triggers. 7-9 receive signals from

logical levels

Original

zero

the state of the flip-flops 28-30 is such that the flip-flops 7-9 when their inputs Q receive a short 1 e pulse generated on the falling edge of the pulse of the generator 24, are in the unit state, i.e. elements 10 - 12 And signals are received in the form of a logical, allowing the passage of

through them the pulses of the corresponding generators 1-3.

 After the end of a pulse with a logic level

and duration

f from the clock generator 24 at its output is set to logical

"ABOUT,

counter 25 - 27 ustauroven

Claims (1)

being poured into the initial state by a Pulse formed on the leading front 65 as follows. With a logic level from the generator 24, the overflow triggers 28-30 are set to their original state (in this case, these triggers are in the initial state, since there are no overflows of counters 25-27). 1 counter. 25 during the time t overflows and sets the overflow trigger 28 to one state. The signals arriving at the inputs of the trigger 7 from the outputs of the trigger 28 {after it is set to one state are such that upon receipt of a short pulse generated in the rear frame NTU pulse with a level of logical kim generator 24, three ger unit 7 changes from state to zero. In this case, from its output to element 10 I, a signal arrives, for example, in the form of a log-suppressing level, the passage of pulses of generator 1 through element 10 and. The absence of impulses at the input of the pulse voltage-to-constant converter 13 leads to the disappearance of a constant voltage at its output, which the prohibition elements do not receive on the elements 16 and 22; generator 2 pulses through element 11 AND, prohibition element 16 and element 19 OR arrive at output 31. When a frequency, such as generator 1, is disrupted, the presence of pulses at output 31 is also provided by generator 2 along the same circuit. or its disruption in any of the three generators. In case of double failures, the redundant generator operates as follows. In case of failure of the generators 1 and 2 (when the frequency breaks down or its coasting), there is no frequency at the outputs of elements 10 and 11 I and the inputs of converters 13 and 14; This leads to the disappearance of constant voltage at their outputs, and consequently, at the elements 16, 17 and 22 of the prohibition. Then the pulses of the generator 3 through the element 22 of the ban and the elements 19 and 20 OR arrive at the outputs 31 and 32. If the generators 1 fail and 3 at the outputs of the elements Yu and 12 and the inputs of the converters 13 and 15, the frequency is absent; this leads to the disappearance of the constant voltage at their outputs and prohibition elements 16, 18, 22 and 23. Then the pulses of the generator 2 through the elements 16 and 18 of the prohibition and respectively through the elements 19 and 21 OR arrive at the outputs 31 and 33 When the generators 2 and 3 fail at the outputs of the elements 11 and 12 AND and the inputs of the converters 14 and 15 frequency: none; This leads to the disappearance of the DC voltage at their outputs and at the elements 17, 18, 22 and 23. Then the generator 1 pulse through the inhibitor element 23 and the elements 20 and 21 OR arrive at the outputs 32 and 33. Thus, with frequency overruns or the failure of any one or two generators to all outputs 31 - 33 impulses from two or one generator working. The technical and economic effect of using this invention is to increase the reliability of the system, which includes a redundant generator. Claims of the invention A redundant three-channel pulse generator, each channel of which contains an element AND, a crystal oscillator connected to a frequency divider, serially connected voltage converter, prohibition element and element OR, the output of voltage converter of the second channel is connected to the inputs of the fourth and fifth prohibition elements , the second input of the fourth prohibition element is connected to the voltage converter of the first channel, and its output is connected to the OR elements of the first and second channels, the second input of the fifth the inhibition element is connected to the voltage converter of the third channel, and its output is connected to the OR element of the third channel, characterized in that, in order to increase the reliability and expand the scope of the generator, it contains a source of clock pulses and in each channel a trigger, the first inputs of which are connected with a source of clock pulses, in each channel the output of a frequency divider Through a trigger connected to one input of the element And, the second, the input of which is connected to the output of the quartz oscillator of this channel, the output of the element And first A channel is connected to the corresponding inputs of a voltage converter, an OR element of a given channel, a barring element of the second channel and a fifth barring element, the output of the AND element of the second channel is connected to the corresponding inputs of a voltage converter, the OR element of this Channel and barring elements of the first and third channels, the output of the AND element of the third channel is connected to the corresponding inputs of the voltage converter, the OR element of its channel and the fourth prohibition element, the outputs of the clock generator The pulses are connected to the synchronization inputs of the frequency dividers of each circuit. Sources of information taken into account in the examination dCCP certificate 03 K 1/00, 1974. USSR certificate 03 K 19/24, 1969