SU785971A1

SU785971A1 - Square-wave shaper

Info

Publication number: SU785971A1
Application number: SU792758369A
Authority: SU
Inventors: Станислав Иванович Зиенко
Original assignee: Московский Ордена Ленина Энергетический Институт, Смоленский Филиал
Priority date: 1979-04-25
Filing date: 1979-04-25
Publication date: 1980-12-07

Description

1one

Изобретение относитс к импульсной технике и может быть использовано в качестве формировател импульсов стабильной амплитуды в зталонных источниках света, устройствах перемагничивани ферритовых приборов, в генераторах стабильной амплитудыThe invention relates to a pulse technique and can be used as a generator of pulses of stable amplitude in reference sources of light, devices for magnetization reversal of ferrite devices, in generators of stable amplitude.

и т.д.etc.

Известен формирователь пр моугольных импульсов, содержащий полевой транзистор, трансформатор со стоковой и нагрузочной обмотками l . Обща точка выходной обмотки и нагрузки подключена через диод в -обратном направлении к стоку полевого транзистора. Недостатком этого формировател вл етс сильна зависимость амплитуды импульсов от изменени напр жени источника питани , так как ее значение пр мо пропорционально величине последнего.A known rectangular pulse driver contains a field effect transistor, a transformer with a drain and a load winding l. The common point of the output winding and the load is connected via a diode in the-reverse direction to the drain of the field-effect transistor. The disadvantage of this driver is the strong dependence of the amplitude of the pulses on the change in the voltage of the power source, since its value is directly proportional to the magnitude of the latter.

Целью изобретени вл етс увеличение стабильности амплитуды импульсов при изменении напр жени источника питани и повышение надежности .The aim of the invention is to increase the stability of the amplitude of the pulses with a change in the voltage of the power source and increase reliability.

Дл достижени этого в Формирователь пр моугольных импульсов, содержащий МОП-транзистор, бипол рный транзистор, импульсный трансформатор с трем обмотками, перва из которых подключена одним концом к общей шине, а другим - к базе бипол рного транзистора, а в цепиTo achieve this, a rectangular pulse shaper containing a MOS transistor, a bipolar transistor, a pulse transformer with three windings, the first of which is connected to the common bus at one end and the other to the base of the bipolar transistor.

5 э «1иттера бипол рного транзистора5 e "1tter of bipolar transistor

включен защитный диод, в него введен опорный источник, коллектор бипол рного транзистора подсоединен к одному концу второй обмотки трансформатора, а катод защитного диода подключен к опорному источнику напр жени запирающей пол рности.a protective diode is turned on, a reference source is inserted into it, the collector of the bipolar transistor is connected to one end of the second winding of the transformer, and the cathode of the protective diode is connected to the reference voltage source of the locking polarity.

На чертеже представлена принципиальна электрическа схема устройства.The drawing shows a circuit diagram of the device.

Claims

The rectangular pulse driver contains a low-power rectangular-pulse master oscillator 1, a coupling capacitor 2, a resistor 3, and a voltage source 4, providing the closed state of the MOS transistor 5 in the initial state. Pulse transformer 6 has a primary winding 7 connected to a power source 8, a secondary winding 9 with a load resistor 10 connected in parallel and an auxiliary winding 11, the start of the winding is connected to the base of a bipolar transistor 12 connected through a diode 13 to a reference voltage source 14, field The polarity of which is blocking for the diode 13 and the emitter junction of the transistor 12. The resistor 15 ensures the normal operation of the biased emitter junction of the transistor 12. Consider the operation of the device. In the initial state, the transistor 5 is closed. With the arrival of a rectangular pulse generator with amplitude Oe from generator 1, transistor 5 opens. In the circuit of its drain, you install with a current of 1 s - J VC D 5 RU the main transfer characteristic of the field effect transistor. The polarity of the windings 7, 9 and 11 is designed in such a way that a positive voltage occurs at the output of the windings 9 and 11. Under the action of positive voltage, transistor 12 is opened. The current in the load circuit 3 "is Zn-9-t) ° the output of the winding 9, 3m is the collector current of transistor 12. It is assumed that the current in the base circuit of transistor 12 3 is much less than the current of 3t can be written -). Consequently, zl - Zc () - at :, where ST is the slope of the transfer characteristic / voltage on the emitter junction of transistor 12. On the other hand, for and fg you can write .rS- Here OI, UH voltage on winding 11} i.- the pressure on the di. 13, all the source voltage is 14. Therefore, we can get:% -3cCW, f%) -ffV4 -ii /%, or for -sf () ,, we have and „- 3s (NN, (, 4) The slope is 8 t where - Omich resistance of the base of transistor 1 is of great importance. For example, at “G .j. 5 ohms and B-10 value Sy g 2000. Therefore, it is not difficult to fulfill the condition Cc (7t“) “(), Thus, the voltage on the load YUM, the voltage 10 is equal to i) "f / VU 4). The condition Ud and is always satisfied, therefore - .. The last relation shows that the amplitude of the voltage pulse on the load does not depend on the value of the supply voltage and is determined by the value of the voltage of the reference source 14. Thus, from consideration of the principle of the proposed ) It can be seen that, compared to the prototype, it basically has a much greater stability of the amplitude of the pulses when the voltage of the power source is changed. Formula of the invention Shaper of an rectangular imlsov, containing a MOS transistor, a bipolar transistor, a pulse transformer with three windings, the first of which is connected to the common bus at one end and to the base of the bipolar transistor with the other, and a protective A diode, characterized in that, in order to increase the stability of the amplitude of the pulses when the voltage of the power source is changed and to increase reliability, a reference source is introduced into it, the collector of the bipolar transistor is connected n to one end of the second winding of the transformer and the cathode of the protective diode connected to the reference voltage source locking polarity. Sources of information taken into account in the examination 1. Electronic equipment in automation, ed. Yu.I. Konev, Soviet Radio, 1978, no. 10, s, 294-299 (prototype).