SU518861A1

SU518861A1 - Pulse generator

Info

Publication number: SU518861A1
Application number: SU1902643A
Authority: SU
Inventors: Валерий Поликарпович Белокуров; Валерий Алексеевич Пискарев
Original assignee: Предприятие П/Я Г-4816
Priority date: 1973-04-04
Filing date: 1973-04-04
Publication date: 1976-06-25

Description

(54) ГЕНЕРАТОР ИМПУЛЬСОВ(54) PULSE GENERATOR

Изобретение относитс к импульсной технике и может быть использовано в системах автоматики, измерительной и вычислительной техники.The invention relates to a pulse technique and can be used in automation systems, measuring and computing equipment.

Известен генератор импульсов, содержащий мост посто нного тока на резисторах, в одно из плеч которого включен конденсатор, а в его диагональ включены через резистор и последовательную Т С-цепь база одного из транзисторов дифференциального усилител , база второго транзистора дифференциального усилител и коллектор транзистора противоположного типа проводимости, при этом параллельно конденсатору подключен переход коллектор - эмиттер ключевого транзистора, база которого через резистор соединена с коллектором транзистора противоположного типа проводимости и общей пшной источника питани .A known pulse generator containing a DC bridge on resistors, one of the arms of which includes a capacitor, and its diagonal includes through a resistor and a serial T C circuit the base of one of the transistors of the differential amplifier, the base of the second transistor of the differential amplifier and the collector of the opposite transistor conductor, while parallel to the capacitor is connected a collector-emitter junction of the key transistor, the base of which is connected via a resistor to the collector of the transistor type of conductivity and common power source.

Однако известное устройство не имеет электронного переключени с автоколебательного режима работы на ждущий режим работы.However, the known device does not have electronic switching from self-oscillating mode of operation to standby mode of operation.

Целью изобретени вл етс обеспечение электронного переключени с автоколебательного режима работы на ждущий режим.The aim of the invention is to provide electronic switching from self-oscillating mode to idle mode.

Дл этого в генератор включен дополнительный транзистор, база которого соединена со средней точкой делител напр жени на резисторах, включенных For this, an additional transistor is included in the generator, the base of which is connected to the midpoint of the voltage divider on the resistors included

в коллекторную цепь транзистора противоположного типа проводимости, его коллектор соединен через резистор с базой транзистора противоположного типа проводимости, а эмиттер - непосредственно соединен с общей шиной источника питаьш .in the collector circuit of the transistor of the opposite type of conductivity, its collector is connected through a resistor to the base of the transistor of the opposite type of conductivity, and the emitter is directly connected to the common bus source.

На чертеже приведена принципиальна электрическа схема генератора.The drawing shows the electrical circuit of the generator.

Генератор импульсов содержит мост посто нного тока на резисторах 1, 2, 3, в одно плечо которого включен конденсатор 4. В диагональ этого моста включеньг.через резистор 5 - база транзистора 6 дифференциального усилител 1, база второго транзистора 8 дифференциального усилител 1 непосредственно и через резистор 5 и последовательную RC-цепь 9 - коллектор транзистора 10 противоположного типа проводимости.The pulse generator contains a DC bridge on resistors 1, 2, 3, in one arm of which capacitor 4 is connected. In the diagonal of this bridge, turn on through resistor 5 - the base of transistor 6 of differential amplifier 1, the base of second transistor 8 of differential amplifier 1 directly and through the resistor 5 and the serial RC circuit 9 are the collector of the transistor 10 of the opposite conductivity type.

Claims

Parallel to the capacitor 4, a collector-emitter junction of the key transistor 11 is connected, the base of which is connected to the connection point of resistors 12 and 13, components of a voltage divider connected between the collector of the opposite type transistor 10 and the common busbar 14 to which one pole of the power supply is connected, the other the pole of which is connected to the bus 15. The emitter of the additional transistor 16 is directly connected to the common bus 14, the base of which is connected to the midpoint of the voltage divider on the resistors 17 and 18, VC connected between the collector of the transistor 10 and the common bus 14, and the collector of the transistor 16 through a resistor 19 is connected to the base of the transistor 10 of the opposite conductivity type. The common bus 15 is connected to the emitter of the transistor 10 of the opposite conductivity type and the collector of the transistor 8 of the differential amplifier directly, and the interconnected base of the transistor 10 and the collector of the transistor 6 of the differential amplifier 7 are connected through a resistor 20. Community 14 is connected to the connection point of the arms from resistor 1 and the capacitor 4 of the DC bridge, the base of the transistor 8 to the connection point of the shoulders from resistors 1 and 2, the bus 15 to the connection point of the arms from resistors 2 and 3, and the resistor 5 to the connection point of the shoulders from resistor 3 and a capacitor 4. The pulse generator works as follows. At the first moment after connecting the supply voltage to buses 14 and 15, the potential difference across the plates of capacitor 4 is zero, and since the potential on the base of transistor 8 is higher than the potential at the base of transistor 6, the output arm - collector output of transistor 6 - differential amplifier 7 is closed .;, the transistors 10, 16 and the key transistor 11 are also closed. The capacitor 4 is charged through the resistor 3, and as the voltage of the capacitor 4 increases, the base potential of the transistor 6 becomes equal to the base potential of the transistor 8, the output arm The differential amplifier 7 opens, causing the opening of the transistor 10, the key transistor 1 and the auxiliary transistor 16. Through the positive feedback circuit through the serial -chain 9, the output arm of the differential amplifier 7 is kept open, despite the fact that the open key transistor 11 begins d of the capacitor 4. The additional transistor 16 supports the open transistor 10 even when the output arm of the differential amplifier 7 is closed due to the termination of the feedback through the serial RC circuit 9. The device comes to a steady state, which is characterized by the fact that the capacitor 4 and the capacitor 9-1 in the RC circuit 9 are discharged, the output arm of the differential amplifier 7 is closed, the transistor 10, the additional transistor 16 and the key transistor 11 are open. To start the generator, it is necessary to break the positive feedback in the trigger formed by transistors 10 and 16, for example, by applying a negative impulse to the base of transistor 16. This closes the transistor 10 and the key transistor 11. After this, the process of charging the capacitor 4 and forming a pulse is repeated. If the control pulse supplied to the base of the transistor 16 is shorter than the charging time of the capacitor 4, then the generator operates in the standby mode, generating a single pulse. With a stepped control action, the device operates in a self-oscillating mode. The invention contains a pulse generator containing a DC bridge on resistors /, one of the arms of which includes a capacitor, and its diagonal includes a resistor of a differential amplifier, a base of a second transistor of a differential amplifier, and a collector of an opposite transistor; conduction type, while parallel to the capacitor is connected a collector-emitter junction of the key transistor, the base of which is connected via a resistor to the collector of the transistor of the opposite type of conduction, and through another resistor - with a common power supply bus, characterized in that, in order to provide electronic switching from self-oscillating mode of operation to standby mode, an additional transistor is connected to the generator, the base of which is connected to the midpoint of the voltage divider on the resistors included in the collector circuit of the transistor of the opposite conductivity type, its collector is connected through a resistor to the base of the same transistor of the opposite conductivity type, and the emitter is not osredstvenno connected to sheathe bus power source.

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