SU995286A1

SU995286A1 - Relaxation generator

Info

Publication number: SU995286A1
Application number: SU803007163A
Authority: SU
Inventors: Вадим Николаевич Мишин; Аркадий Семенович Бикулов; Геннадий Алексеевич Ракитин
Priority date: 1980-11-25
Filing date: 1980-11-25
Publication date: 1983-02-07

Description

Изобретение относитс к импульсной технике и может быть использовано в качестве генераторов импульсов в различных схемазс управлени преобра13овател ми .The invention relates to a pulse technique and can be used as pulse generators in various converter control circuits.

Известен генератор, содержаа(ий одиопереходной транзистор, эмиттер которого соединён -с средней точкой врем задающей цепочки, содержащей источник тока.на транзисторе и конденсатор 111 .A generator is known, containing (it is a one-transition junction transistor, the emitter of which is connected — with the midpoint of the time of the driver circuit containing the current source on the transistor and the capacitor 111.

Однако устройство обладает узким ; диапазоном перестройки частоты.However, the device is narrow; frequency tuning range.

Известен релаксационный генератор, содержаа1Ий однопереходной транзистор, базы которого через резисторы соединены с шинами питани , а эмиттер с средней точкой врем задающей цепи, содержащей источник тока на р-и-р транзисторе и конденсатор, и ц-р-и транзистор, база которого соединена с первой базой ОПТ, эмиттер с отрицательной шиной питани , а коллектор через резистор - с эмиттером ОПТ 121 .A relaxation generator is known that contains a single junction transistor, the bases of which are connected to the power lines through resistors, and the emitter has a midpoint time of the master circuit containing a current source on the p-and-p transistor and a capacitor, and a cp-transistor whose base is connected with the first base of the OPT, the emitter with a negative power bus, and the collector through a resistor - with the OPT emitter 121.

Однако генератор, облада расширенным диапазоном перестройки частоты,. имеет ограничени в сторону уменьшени частоты.However, the generator has an extended frequency tuning range. has limitations in terms of decreasing frequency.

Цель изобретени - расширение дйа пазона перестройки-частоты.The purpose of the invention is to expand the frequency tuning range.

Поставленна цель достигаетс тем, что в релаксационном генераторе, содержащем однопереходной транзистор, базы которого соединены через резисторы с шинами питани , врем задающую цепь с источником тока нар-и-Р транзисторе и конденсатором и п-р-и транзистор с резистором в цепи коллекто-. ра, база h-p-м транзистора соединена с средней точкой врем задающ1ей цепи, эмиттер - с эмиттером одноперехрдного транзистора, а коллекторна . цепь - с положительной шиной питани .This goal is achieved by the fact that in a relaxation generator containing a single junction transistor, the bases of which are connected via resistors to the power buses, the time of the driving circuit with the current source is the ip-ip transistor and the capacitor and the p-p-transistor . Pa, the base of the hpm transistor is connected to the midpoint of the time of the master circuit, the emitter is connected to the emitter of the single-transistor, and the collector. chain - with a positive power bus.

На чертеже представлена принципиальна схема предлагаемого релаксационного генератора.The drawing shows a schematic diagram of the proposed relaxation generator.

Релаксационный генератор содержит источник тока нар-м-р транзисторе 1, элементах 2-4, конденсатор 5,vi-p-M транзистор б, коллектор которого через резистор 7 соединен с положительным зажимом .источника питани , а эмиттер - с эмиттером однопереходного транзистора В, базы которого через резисторы 9 и 10 соединены с шинами источника питани .The relaxation generator contains a current source of the drug-mr transistor 1, elements 2-4, capacitor 5, vi-pM transistor b, the collector of which is connected through a resistor 7 to the positive terminal of the power source and the emitter to the emitter of the unijunction transistor B, base through which resistors 9 and 10 are connected to the power supply buses.

Claims

The principle of action of the relaxation generator is based on periodic processes of charge and discharge of the condenser. At the initial moment of a single junction, the transistor is closed. After the power supply is turned on, the capacitor 5 begins to charge through the element 2 and the transistor 1 aglitterno-coupler transition. DQ reaching on the capacitor 5 (the voltage equal to the turn-on voltage of the transistor 8, the emitter transitions of transistors 6 and 8 become conductive. A breakdown of transistor 8 occurs, and the capacitor 5 is discharged through the emitter junction of the saturated transistor 6, the transistor 8 and the resistor 9 on which the output pulse is formed. At the end of the capacitor discharge, the transistor 8 closes and then The switching on of the transistor b allows increasing the current of the emitter junction of the single junction transistor during the development interval of the relaxation process into the amplification factor of the transistor of the transistor 6, and using for charging the capacitor currents smaller than ts.a switching on the single junction transistor, which allows frequency tuning range in the direction of its decrease. After a breakdown at the stage of capacitor discharge, transistor 6 is saturated and does not affect the further operation of the circuit. Degree of nasiacene of the transistor is obtained by the resistor 7. Formula of the invention Relaxation generator containing a single junction transistor, the bases of which are connected via resistors with busbars, the time specified circuit with the current source nar-vi-p transistor and capacitor II-p-i a transistor with a resistor in the collector circuit, characterized in that, in order to extend the frequency tuning range, the base of the cp-I transistor is connected to the midpoint of the time of the circuit, the emitter is connected to the emitter of the single junction transistor body shi-. Noah food. Sources of information taken into account in the examination of I. Erofeev I., A. Switching devices on unijunction transistors, Link, 1974, p. 59, Fig.5.3. I

2. Tam.zhe, with. 65, fig. 5-11 (prototype).

B0-p

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