SU1619381A1 - Variable one-shot multivibrator - Google Patents

Description

The invention relates to a pulse technique and can be used in pulse shapers and electronic delay devices.

The purpose of the invention is to reduce the recovery time and simplify the controlled standby multivibrator.

The goal is achieved by electronically controlling the value of the constant time of the charging circuit, the time of the driving capacitor, which reduces this value during the charging time of the driving capacitor, without increasing the power consumption of the device.

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The drawing shows a functional diagram of a controlled standby multivibrator.

The controlled standby multivibrator contains a standby multivibrator, which includes the time setting capacitor 1, (N-1) two-terminal 2-1 .., 2 (N-1) with current-voltage characteristics corresponding to the current-voltage characteristics of Zener diodes, N key elements 3-1. ..3-N and N-input element OR 4, whose N inputs are connected to M input buses of a controlled waiting multivibrator, and the output is connected to the signal input of a waiting multivibrator, with the first poles of a two-terminal 2-1 ,,, .- ( M-1) connected to the outputs of the corresponding key elements 3-1 ...- (N-1), the signal inputs of the key elements 3-1 ... 3- (N-1) are interconnected and connected to the first lining of the time - master capacitor 1, the control inputs of the key elements 3- 1 ... 3- (К-1 is connected to the corresponding inputs of the N-input element OR, the combined second poles of the two-terminal 2-1 ... 2- (N-1) are connected to the second plate, the time of the setting capacitor 1, the first bipole A transistor 5, a power transistor of its multivibrator, is connected to a collector through a resistor 6 with a power supply bus 7, and the base is connected through a capacitor 3 to a signal by a standby multivibrator and through a resistor 9 and a resistor 10 with a power supply source bus 7 and a common bus 11, respectively, and an emitter connected to the emitter of the second bipolar transistor 12 and connected through a resistor 13 to common wiring 11, the second bipolar transistor 12 connecting the base with the first facing time

about g 0 5 Q

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m of the setting capacitor 1 and through a resistor 14 with a pin of the power source 7, and a collector - with the output bus of a controlled standby multivibrator and through a resistor 15 with an alternating power source 7, the Nth key element being connected with the 3-N signal input 7 power supply, control inputs - with the collector of the first bipolar transistor 5, output - with the second plate the time of the driving capacitor 1, while the key element 3-N contains a bipolar transistor 3-N-1 and a 3-N-2 resistor, the outputs of which connected respectively to the base bipol p 3-N-1 transistor, which is the control input of the key element 3-N, and to the emitter of the 3-N-1 bipolar transistor, which is the output of the key element 3-N, and the collector is bipolar: o transistor 3-N -1 is the signal input of the 3-N key element.

The controlled standby multivibrator operates as follows.

In the initial long-term stable state, the transistor 5 is locked, the transistor 1 is open and saturated, the time specifying the capacitor 1 is charged to the voltage V and. At the moment when the starting pulse of a controllable multivibrator starts to enter the M-th input bus, the key element 3-N opens and the fast (in time not exceeding the duration of the start pulse) discharge time of the driving capacitor 1 to the voltage determined by The stabilization of the two-terminal 2-N stabilization, which is selected from the ratio / st / r-p I t TH / At the same time, the multivibrator 1 is triggered by a start pulse from the output of the N-input element OR 4 and goes into a quasistable state. The duration of the pulse generated by the controllable multivibrator while the multivibrator is in a quasistable state,

the voltage is determined by the time of the reference capacitor 1 at the time of the termination of the trigger pulse and the smaller, the smaller the voltage on this capacitor. When a start-up pulse is applied to the N-input bus of a controlled, waiting, fast-discharge multivibrator, the time of the driving capacitor does not occur and the duration of the pulse being formed will be maximum. Its value can be matched from

3K

capacitance change time setting capacitor 1.

When the standby multivibrator 1 is in a quasistable state, transistor 5 is open and saturated, and transistor 1-9 is locked. When this occurs, the discharge time of the capacitor 1 across the circuit bus 7 occurs - resistor 14 - first plate time of master capacitor 1 - second plate time of master capacitor 1 - resistor 3-N-2 - collector of transistor 5 - emitter of transistor 5 - resistor 13 - bus 11. When the voltage at the base of the transistor 12 reaches the value equal to the voltage on its emitter, the transistor 12 opens, and the transistor 5 closes and the multivibrator waits for a long steady state, and the supply of the next start pulse must be It is not earlier than after full recovery of the initial charge that the time of the setting capacitor 1 is charged. The charge of the setting capacitor 1 is charged through the first charging circuit bus 7 - resistor 6 - control input of the key-element 3-M output of the key element 3 -N - second plate time of master capacitor 1 - first plate of brom - master capacitor 1 - base of transistor 1. - emitter of transistor 12 - resistor 13 - bus 11, and also for the second charge circuit bus 7 - signal input of the key element -N- output of the key element 5-N - the second for the time of the driving capacitor 1 - the first plate the time of the setting capacitor 1 - the base of the transistor 12 - the emitter of the transistor 12 - the resistor 13 - the bus 11. It should be noted that the current flowing through the first charge circuit is almost equal to the current flowing charge time of the driving capacitor is a known controlled standby multivibrator,

Thus, the invention reduces the recovery time of the controlled standby multivibrator by electronically controlling the value of the time constant of the charging circuit, the time of the driving capacitor, which reduces this value during the charging time of the driving capacitor by forming the second charging circuit, while simplifying the design of the controlled battery. w uvicho multivibrator for

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the account of the exclusion of a single-pole two-pole circuit with a voltage-current characteristic, together with a fast current-voltage characteristic of a zener diode.

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Claims (2)

1. Controlled standby multivibrator, containing a mucous vibrator, including a time setting capacitor with electrical circuits connected in parallel with it (N-1), each of which contains a two-pole series connected, volt-perm characteristic of the Zener diode, g PNP poment, the Nth key element and the N input element of the NLP, whose N-pin is connected to the N input pto-pins of the controlled multivibrator that is waiting for the output, and the output to the signal input of the multi-vibrator, With a vnpan junk, the inputs of each of the (N-1) HYOCHGROT on an element are combined with coo-t lotter yuppmi inputs of the N-input pgmg111l 1PI, and the collector iiopnoi about the Oppo uipnoro transistor zhtshggo ml r-tiiBHfyr tyr tir tir tp. Osdin through the capacitor with a ngOr n eagle waiting input and through the second and third mountains to the power source and bus, respectively, a emitter o (h, one with the emitter secondly bppn of the transistor and through the resistor n in the resistor is connected with a common niutoii, the second bipol r- ° whom transis The ora is connected to the first section of the lrch-assigning capacitor and 4t cut-off fifth resistor with the power supply bus, the collector is connected to the output bus of the controlled mini-vibrator and through the sixth resistor with the power supply bus, t-l and v and and c By the fact that, in order to wake up), 1-1fits of the recovery time and the control of the waiting standby multivibrator, the Nth key element is connected to the power supply busbar, the control input to the collector of the first bipolar transistor, the trick is with the second facing time setting to ondensor. 2. Multivibrator according to claim. Characterized in that the Nth 7161933Г8 the key element contains a bipolar p-bipolar transistor, which is a transistor and a resistor, the output of the N-ro key element, which are connected respectively to the collector of the bipolar transistor | to the base of the bipolar transistor, v-pa is the N-ro signal input control input of the N-key element, the key element, and to the emitter