SU347915A1 - AUTOMATIC SWITCH OF BASIC AND RESERVE PULSE GENERATORS - Google Patents

Description

The invention relates to a pulse technique and can be used to increase the reliability of pulse systems containing frequency dividers.

The known automatic switch of the main and backup pulse generators, containing a sensitive element made on the first KIPP-relay, a switching device made on the second KIPP-relay, three schemes "NOT, scheme" OR, a device with two stable states, consisting of trigger and “And, and trigger” schemes, does not switch generators from main to standby when the pulse frequency of the main generator changes and when there are failures and noises at its input.

The purpose of the invention is to obtain the possibility of switching the main and backup generators by changing the period of the pulses of one of them and to prevent the passage of false pulses to the output.

For this, in the proposed device, the output of the main generator is connected to the output of the trigger and the input of the first Kipp relay, the output of which is connected to the inputs of the second Kipp relay and the trigger; the output of the second Kip-relay is connected via the first circuit "NOT to the trigger input, to the input of the device with two stable states and to the input of the second circuit the output of the trigger through the second circuit" NOT connected

with an input of an OR circuit and a third NOT circuit and an input of a device with two stable states, the input of which is connected to the input of the backup generator, and the output with an OR circuit and a third circuit of NOT, the input of which is connected to the output of the OR circuit , and the output - to the second Kipp-relay and the first scheme “NOT.

FIG. 1 is a block diagram of an automatic pulse generator switch; in fig. 2 is a timing diagram of its operation at a normal pulse frequency of the main generator; in fig. 3 - time diagrams of his work while reducing the frequency of the main generator; in fig. 4 - time diagrams of his work with increasing frequency of the main generator.

The switch consists of a Kipp-relay 1 and 2, trigger 3, circuits 4, 5 and 6 "NOT, circuit 7" OR, and device 8 with two stable states (device 8 can be made of a trigger and circuit "I").

Kip-relay 1 produces pulses of duration (0.94 ± 0.02) 7, and Kip-relay 2 produces pulses of duration (0.115 ± 0.015) 7 (T is the period of the pulse of the main generator). The pulse duration of a kiprele 1 2 is selected from the condition of detecting the worst decade divider (the divisor divides by 9 or 11).

The initial state of the device 8 is such that the signals from input 9, to which the backup generator is connected, pass to circuit 7 "OR and further to output 10 of the converter. The pulse from the output of the device 8 is supplied to the circuit 6, prohibiting the passage of a pulse from the output 10 to the KIPP-relay 2.

The signal (see Fig. 2a) of the main generator, which is fed to input 11, triggers a KPP relay U, which produces a pulse (see Fig. 26) with a duration (0.92 ± 0.96) G. Trailing edge of the KIPP relay The Kipprele 2 is started (see Fig. 2e) and trigger 3 is set to one (see Fig. 2d). The next pulse from the input // re-starts the KPP-relay 1 and returns the trigger 3 to the zero state. Pulse flip from "1 to" On trigger 3 through circuit 4 "is NOT fed to circuit 7" OR and to the input of device 8, which disconnects from circuit 7 "OR the signal (see, Fig. 2 (3) of the backup generator coming to input 9. An impulse (see Fig. 2e) from the output of circuit 7 "OR through circuit 6" is sent to the forced reset of the Kipp-relay 2 to the initial state and to the circuit 5 "NOT to prohibit further passage of the rear edge of the Kipp-relay 2. Increasing the pulse repetition period of the main generator to 1.1 G and more after (1.02-1.09 G) the Kip-relay 2 returns to steady with staying at the falling edge of its pulse through circuit 5 “DOESN'T overturn trigger 3 to position“ O, prohibit the passage of a reversal pulse from “1 to“ O pa circuit 7 ”OR prohibiting circuit 4” NOT. At the same time, the pulse from the output of circuit 5 "NOT the device 8 comes in, which translates into a position that permits the passage of the backup generator signal from input 9 through scheme 7 OR input input

10.Next impulse to input

11, starts the KIPP-relay 1, but cannot flip over the trigger 3, since it was tilted to the position “About the falling edge of the pulse

kip-relay 2 before the arrival of the pulse.

By reducing the period of the pulses of the main generator, the pulse arriving at input 11 does not make any changes in the circuit, since trigger 3 is still in the position "O from the previous input pulse, and the Kipp-relay is in a temporarily stable state and does not react on high impulses.

Subject of invention

Automatic switch of the main and backup pulse generators, containing a sensitive element made on the first Kipp-relay, switching device made on the second Kipp-relay, three schemes "NOT, scheme" OR, and a device with two stable states, consisting of a trigger And & and trigger schemes, characterized in that, in order to be able to switch the main and standby generators when the pulse period of one of them is changed, and to exclude the passage of false pulses to the output, ovnogo generator connected to the output and input of the first flip-flop kvpp relay, the output of which is coupled to inputs of the second Kipp-switch and trigger; the output of the second Kip-relay is connected via the first circuit "NOT to the trigger input and the device input with two stable states and the input to the second circuit output

the trigger through the second circuit "is NOT connected to the input of the circuit" OR and the third circuit "NOT and the input of the device with two stable states, the input of which is connected to the input of the backup generator, and the output -

“OR circuit” and the third circuit “NOT, the input of which is connected to the output of the circuit“ OR, and the output to the second Kipp-relay and the first circuit “NOT.

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