SU938371A1

SU938371A1 - One-shot multivibrator

Info

Publication number: SU938371A1
Application number: SU802920541A
Authority: SU
Inventors: Михаил Иосифович Богданович
Original assignee: Вычислительный Центр Белорусской Республиканской Конторы Госбанка Ссср
Priority date: 1980-05-12
Filing date: 1980-05-12
Publication date: 1982-06-23

Description

Изобретение относится к импульсной технике и может быть использовано в различных электронных устройствах автоматики, телеавтоматики и вычислительной техники.The invention relates to a pulse technique and can be used in various electronic devices of automation, teleautomatics and computer technology.

Известен одновибратор, содержащий три транзистора, один времязадающий конденсатор, резисторы [1].Known one-shot, containing three transistors, one timing capacitor, resistors [1].

Однако этот одновибратор имеет малый диапазон длительностей выходных ¹⁰импульсов при постоянной величине времязадающего конденсатора.However, this single-shot has a small range of durations of the output ¹⁰ pulses with a constant value of the timing capacitor.

Известен также одновибратор, содержащий первый, второй и третий транзисторы, эмиттеры первого и второго тран-¹⁵зисторов соединены с общей шиной, их коллекторы через первый и второй резисторы соединены с шиной питания, база первого транзистора через второй диод соединена с шиной и через времязадающий конденсатор с эмиттером третьего транзистора, который через трет тий резистор соединен с шиной питания, база третьего транзистора соединена с делителем напряжения, состоящим из четвертого и пятого резисторов, его коллектор - с базой второго транзистора и через шестой резистор с коллектором . . первого транзистора, первый диод, соединяющий входную клемму с коллектором первого транзистора, и второй диод, включенный между коллектором второго и эмиттером третьего транзисторов £2].Also known monostable multivibrator comprising a first, second and third transistors, the emitters of the first and second tran- ican ¹⁵ are connected to a common bus, their collectors via first and second resistors connected to the power bus, the base of the first transistor via a second diode connected to the tire and through the timing capacitor with the emitter of the third transistor, which is connected to the power bus through the third resistor, the base of the third transistor is connected to a voltage divider consisting of the fourth and fifth resistors, its collector to the base of the second ranzistora and via the sixth resistor to the collector. . the first transistor, the first diode connecting the input terminal to the collector of the first transistor, and the second diode connected between the collector of the second and the emitter of the third transistor £ 2].

Однако и этот одновибратор имеет малый диапазон длительностей выходных импульсов, так как величина времязадающего резистора ограничена условием удержания транзисторов в насыщенном состоянии, и большую длительность фронта импульса»However, this one-shot also has a small range of durations of the output pulses, since the value of the time-setting resistor is limited by the condition of keeping the transistors in a saturated state, and a large duration of the pulse front "

Цель изобретения - увеличение диапазона длительности выходного импульса и сокращение его фронта.The purpose of the invention is to increase the range of the duration of the output pulse and reduce its front.

Поставленная цель достигается тем, что в одновибраторе, содержащем первый, второй и третий транзисторы, у которых эмиттеры первого и второго транзисторов соединены с общей шиной, их коллекторы через первый и второй резисторы соединены с шиной питания, база первого транзистора соединена $ через первый диод с входной клеммой устройства, через второй - с общей шиной, а непосредственно - с первой обкладкой времязадающего конденсатора, вторая обкладка которого соединена с ю первым выводом третьего резистора и эмиттером третьего транзистора, ба за которого соединена со средней точкой делителя'напряжения, состоящего из четвертого и пятого резистора, а кол- _|5лектор - с базой второго транзистора, третий диод и шестой резистор, первый вывод которого соединен с коллектором первого транзистора, второй вывод шестого' резистора через третий диод соединен с базой второго транзистора, второй вывод третьего резистора соединен с его коллектором, а делитель напряжения включен между базой первого и коллектором второго транзисторов. ₂₅На чертеже приведена принципиальная схема одновибратора.This goal is achieved by the fact that in a single vibrator containing the first, second and third transistors, in which the emitters of the first and second transistors are connected to a common bus, their collectors are connected to the power bus through the first and second resistors, the base of the first transistor is connected $ through the first diode with the input terminal of the device, through the second with the common bus, and directly with the first lining of the timing capacitor, the second lining of which is connected to the first output of the third resistor and the emitter of the third transistor, ba behind which it is connected to the midpoint of the voltage divider, consisting of the fourth and fifth resistor, and the collector _{| 5} lecturer to the base of the second transistor, the third diode and sixth resistor, the first terminal of which is connected to the collector of the first transistor, the second terminal of the sixth 'resistor through the third diode is connected to the base of the second transistor, the second output of the third resistor is connected to its collector, and a voltage divider is connected between the base of the first and the collector of the second transistor. ₂₅ The drawing shows a schematic diagram of a single vibrator.

Одновибратор содержит первый 1, второй 2 и третий 3 транзисторы, второй 4, первый 5 и третий 6 диоды, времязадающий конденсатор 7» ^первый ³⁰8, шестой 9, третий 10, второй 11, четвертый 12 и пятый 13 резисторы, шину 14 питания, входную клемму 15· Одновибратор работает следующим образом. ^Э5 The single vibrator contains the first 1, second 2, and third 3 transistors, second 4, first 5, and third 6 diodes, a timing capacitor 7 ^ ^ first ³⁰ 8, sixth 9, third 10, second 11, fourth 12 and fifth 13 resistors, power bus 14 , input terminal 15 · One-shot works as follows. ^E5

В исходном состоянии транзистор 1 закрыт, а транзистор 2 открыт и удерживается в открытом состоянии током, проходящим через резисторы 8, 9 и диод 6. Конденсатор 7 разряжен. На выхо·⁴⁰де 16 присутствует высокий потенциал, а на выходе 17 ~ низкий.In the initial state, the transistor 1 is closed, and the transistor 2 is open and held open by the current passing through the resistors 8, 9 and the diode 6. The capacitor 7 is discharged. At the outlet · ⁴⁰ de 16 there is a high potential, and at the exit 17 ~ low.

При поступлении на входную клемму положительного запускающего импульса транзистор 1 откроется, а транзис- ⁴⁵тор 2 закроется. Потенциал на выходе уменьшится практически до нуля, а потенциал на выходе 17 увеличится. Возникает ток через резисторы 12 и 13. который будет удерживать транзистор 1 50 во включенном состоянии и после окончания запускающего импульса.On admission to the positive input terminal of the trigger pulse the transistor 1 is opened, and ⁴⁵ torr tranzis- 2 closes. The output potential will decrease to almost zero, and the output potential 17 will increase. There is a current through the resistors 12 and 13. which will keep the transistor 1 50 in the on state and after the end of the triggering pulse.

Конденсатор 7 будет заряжаться от высокого потенциала на выходе 17 через резистор 10. Когда напряжение на 55 конденсаторе превысит напряжение на. средней точке делителя напряжения на резисторах 12 и 13, транзистор 3 от кроется, ток его коллектора, проходя через переход база - эмиттер транзистора 2, приведет к открыванию последнего и уменьшению напряжения на* делителе. Возникает лавинообразныйпроцесс открывания транзисторов 2 и 3·’The capacitor 7 will be charged from a high potential at the output 17 through the resistor 10. When the voltage at 55 of the capacitor exceeds the voltage by. the midpoint of the voltage divider at resistors 12 and 13, the transistor 3 is turned off, the current of its collector, passing through the base-emitter junction of transistor 2, will open the latter and decrease the voltage at the * divider. There is an avalanche process of opening transistors 2 and 3 · ’

Конденсатор 7 разрядится через открытый транзистор 3» переход база эмиттер транзистора 2 и диод 4.The capacitor 7 is discharged through an open transistor 3 "transition base emitter of transistor 2 and diode 4.

Полярность напряжения на базе транзистора 1 во время разряда конденсатора изменится на противоположную, и транзистор 1 закроется.The voltage polarity at the base of transistor 1 during the discharge of the capacitor will reverse, and transistor 1 will close.

Включение диода 6 в цепь базы транзистора 2 приводит к тому, что во время начала регенеративного процесса включения транзисторов 3 и 2 весь ток коллектора транзистора 3 проходит через базу транзистора 2, что увеличивает чувствительность нуль-органа (транзисторов 3 и 2) . Транзистор 1 удерживается в открытом состоянии во время формирования импульса за счет тока через делитель напряжения на резисторах 12 и 13 и поэтому не накладываются ограничения на величину времязадающего резистора 10.The inclusion of a diode 6 in the base circuit of transistor 2 leads to the fact that during the start of the regenerative process of turning on transistors 3 and 2, the entire collector current of transistor 3 passes through the base of transistor 2, which increases the sensitivity of the zero-organ (transistors 3 and 2). The transistor 1 is kept open during pulse formation due to the current through the voltage divider on the resistors 12 and 13 and therefore there are no restrictions on the value of the time-setting resistor 10.

Claims

The invention relates to a pulse technique and can be used in various electronic devices of automation, teleautomatics and computer technology. Known odnovib.rator containing three transistors, one time specifies a capacitor, resistors l. However, this one-shot has a small range of output pulses at a constant time value of the driving capacitor. Also known is a one-shot, containing the first, second and third transistors, the emitters of the first and second granistors are connected to a common bus, their collectors are connected to the power bus through the first and second resistors, the base of the first transistor is connected to the bus through the second diode and the capacitor with the emitter of the third transistor, which through a third resistor is connected to the power bus, the base of the third transistor is connected to a voltage divider consisting of the fourth and fifth resistors, its collector is connected to the base of the second transistor and through the sixth resistor with a collector. . the first transistor, the first diode connecting the input terminal to the collector of the first transistor, and the second diode connected between the collector of the second and the emitter of the third transistor C However, this single vibrator also has a small range of output pulse durations because the time of the setting resistor is limited saturated state, and a large pulse front duration. The purpose of the invention is to increase the duration of the output pulse and reduce its front. The goal is achieved by the fact that in a single vibrator containing first, second and third transistors, in 393 of which the emitters of the first and second transistors are connected to a common bus, their collectors are connected through the first and second resistors to the power bus, the first transistor is connected to the first diode the input terminal of the device, through the second with a common bus, and directly with the first lining the time of the driving capacitor, the second lining of which is connected to the first output of the third resistor and the emitter of the third transistor, ba which is connected to the midpoint of the voltage divider consisting of the fourth and fifth resistor, and the collector - with the base of the second transistor, the third diode and the sixth resistor, the first output of which is connected to the collector of the first transistor, the second output of the sixth resistor through the third diode the base of the second transistor, the second terminal of the third resistor is connected to its collector, and the voltage divider is connected between the base of the first and the collector of the second transistor. The drawing shows a schematic diagram of the one-shot. The single-oscillator contains the first 1, second 2 and third 3 transistors, the second, first 5 and third 6 diodes, the time specifying the capacitor 7 for the first 8, the sixth for the 9. third 10, the second 11, the fourth 12 and the fifth 13 resistors. power bus, input terminal 15 The uni-vibrator operates as follows. In the initial state, the transistor 1 is closed, and the transistor 2 is opened and held in the open state by the current passing through the resistors 8, 9 and diode 6. The capacitor 7 is discharged. The output 16 has a high potential, and the output 17 has a low potential. When a positive trigger pulse arrives at the input terminal 15, transistor 1 will open and transistor 2 will close. The potential for output 16 decreases almost to zero, and the potential for output 17 increases. A current is generated through resistors 12 and 13. which will keep transistor 1 in the on state even after the end of the triggering pulse. The capacitor 7 will be charged by the high potential at the output 17 through the resistor 10. When the voltage across the capacitor exceeds the voltage at the midpoint of the voltage divider on resistors 12 and 13, the transistor 3 is open 14, its collector current passes through the base-to-emitter junction transistor 2, will lead to the opening of the latter and reduce the voltage on the divider. An avalanche-like process of opening the transistors 2 and 3 appears. Capacitor 7 is discharged through the open transistor 3, the base of the emitter of transistor 2 and diode k is crossed. The inclusion of diode 6 in the base circuit of transistor 2 causes the entire collector current of transistor 3 to pass through the base of transistor 2 during the start of the regenerative process of turning on transistors 3 and 2, which increases the sensitivity of the zero-organ (transistors 3 and 2). Transistor 1 is held in an open state during pulse generation due to current through a voltage divider on resistors 12 and 13 and therefore no limitation is imposed on the time value of the setting resistor 10. Formula of the Invention One-vibrator containing first, second, and second emitters the transistor is connected to the common power line, their collectors are connected via the first and second resistors to the power line, the base of the first transistor is connected through the first diode to the input terminal, through the second one to the common line and, directly with the first plate, the time of the driving capacitor, the second plate of which is connected to the first output of the third resistor and the emitter of the third transistor, the base of which is connected to the midpoint of a voltage divider consisting of the fourth and fifth resistors., the collector is to the base the second transistor, the third diode and the sixth resistor, the first output of which is connected to the collector of the first transistor) i differ in that, in order to increase the range of the pulse duration and reduce its front, the second output the sixth resistor is connected via a third diode to the base of the second transistor, a second output (the third resistor is connected to its collector, and a voltage divider 5 is connected between the base of the first and the collector of the second transistor. Sources of information taken into account in the examination 9383716 1. USSR author's certificate N 632057, cl. H03 K 3/284, 1977.

2. USSR author's testimony, cl. Н03 К 3/281, 06.12.66.