SU1309260A2 - Pulse generator - Google Patents

Abstract

The invention can be used in automation and remote control devices and is complementary to the author. St. No. 693533. The purpose of the invention is to increase the pulse frequency. The pulse generator contains transistors 1 and 2 of different types of conductivity, diode 3 and Zener diode 4. Introduction of transistor 10, Zener diode 11 and resistors 12-14 helps to weaken the dependence of the stability of the pulse frequency on the residual voltage on the time of the master capacitor 8. 1 or . (L OO about with to O5 N)

Description

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The invention relates to a pulse technique, can be used in a variety of: automation and telemechanic devices and is an improvement of the device according to the authors, f 693533,

The purpose of the invention is to increase the stability of the pulse frequency by reducing its dependence on the magnitude of the residual voltage by the time of the master capacitor.

The drawing shows the circuit diagram of the device.,

The pulse generator contains the first 1 and second 2 ocHOBittie transistors of different conductivity types, a diode 3 connected between the base transistor and collector of transistor 2, and a zener diode 45 connected between the base of the transistor and the common bus 5, which connects the emitter of transistor 2, the collector transistor 2 through a resistor 6 is connected to the power supply bus 7, and the base of the transistor 2 is connected to the collector of the transistor, the emitter of which is connected to the bus 5 through the time specifying the capacitor 8 and to the bus 7 through a resistor 9 , Zener diode P and resistors 12-14. The emitter of transistor 10 is connected to the emitter of transistor 1 of a different conductivity type, the collector of transistor 10 is connected to bus 7 via resistor 1 and the base of transistor 10 is connected to collector of transistor 2 through resistor 13 and to bus 5 via zener diode 11, shunted by a resistor

The pulse generator works as follows.

When a voltage is applied to the bus 7, the capacitor 8 is discharged, the transistors 1 and 2 are closed, on the output bus 15

there is a high potential. Current through resistors 6 and. 13 opens the transistor 10 and the capacitor 8 is charged by the emitter current of the transistor 10 and the current through the resistor 9; moreover, the emitter current of the transistor 10 several times

45

Claims (1)

Invention Formula Pulse generator auth. No. 6 9 3 5 3 3 5 about tl and h and yushchi and the fact that, in order to increase the stability of the pulse frequency, exceeds the current through the resistor 9, for example, an additional transistor is introduced, capacitor relative to the Zener diode and three resistors, and rises rapidly and when it reaches reference voltage U, j zener diode the emitter of the additional transistor is connected to the emitter of the first main transistor of a different type, the protractor 10 is closed. The capacitor 8, -55 dimmers, the additional collector continues to be charged through the resistor of the transistor connected to the power supply, the latter is punctured, and the transistor 9, however, the voltage build-up rate decreases several times. Kog O five 260 0 2 yes, the voltage across the capacitor rises to the voltage of the breakdown of the Zener diode 45, which is greater than the Ug5 opening of the emitter junction of the transistor 5 15 which leads to an increase in the collector current of transistor 1, which opens transistor 2, the potential on bus 15 decreases, and when this potential becomes less than the breakdown voltage of zener diode 4, diode 3 opens, resulting in an avalanche-like process of switching and saturation of transistors 1 and 2 due to the positive feedback between the bases and collectors of these transistors. The potential on bus 15 decreases almost to zero Zener diode 11 and transistor 10 close. The capacitor 8 is discharged through the open transistors 1 and 2, the discharge current is reduced and the transistors 1 and 2 are closed like an avalanche. The residual voltage Ug | ,,, remains on the capacitor (J potential on bus 15 increases, transistor 10 reopens and a new charge cycle of capacitor 8 begins. Later, the processes in the pulse generator are repeated. With a change in temperature, the residual voltage Uft; changes, however, due to the fast charge of the capacitor 8 to the voltage UQ, which depends to a small extent on temperature, as determined by the voltage of the Sitron 1 1 ,, voltage change Uf.jj - turning off the negatron, . performed on transistors 1 and 2, insignificantly affects the pulse frequency, which causes the corresponding, its new frequency stability. five thirty 45 Invention Formula Not through the additional additional resistor j but the base of the additional trans 3113.092604 The technician is connected to the collector by the other bus through an additional old main transistor through a bilitron, the third second-connected additional resistor, and the additional resistor.