SU1081778A1 - Polyphase multivibrator - Google Patents

Abstract

1. MULTI-PHASE MULTI-VIBRATOR containing an even number of cells including a key on a transistor with a common emitter, a threshold element on the second transistor whose collector is connected to the base of the first transistor, and the emitters of the second transistors of the even cells through the first and odd after the second time setting resistors connected to the power bus and directly to the first and second plates of the time of the driving capacitor, characterized in that, in order to improve the shape of the output pulses, a sequence is introduced into each cell no connected two resistors and a diode connected between the outputs of the keys and the previous cell, the base of the second transistor cells connected with common terminals of resistors.

Description

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2. The multivibrator according to claim 1, in which, in order to ensure launch from the first

Cell, the base of the second transistor through a zener diode connected to a common

by bus.

one

The invention relates to electronic pulse technology and can be used in various automation devices, telemechanics and computer technology.

A multiphase multivibrator is known, which contains one time setting the capacitor, the cells on two transistors of different conductivity and the communication keys between cells, are also made on two transistors of different conductivity C 11.

However, such a multivibrator contains a large number of active elements (transistors); per cell.

The closest technical solution to the invention is a multi-phase multivibrator containing an even number of cells, including a key on a common emitter transistor and a threshold element on the second transistor, whose collector is connected to the base of the first transistor, and the emitters of the second transistors of even cells through the first and odd after a second time, the driving resistors — with the power bus and directly — with the first and second plates, the time of the driving capacitor 2.

However, this multiphase multivibrator has a poor output pulse shape / because the voltage at the output of the cell changes twice: during cell preparation and when it is turned on.

In addition, the known multiphase multivibrator has a low frequency stability of the pulse when the voltage of the supply voltage changes (when powered from an unstabilized source), since the cell response thresholds are determined by the zener diodes and do not change with the direction of the power supply.

The purpose of the invention is to improve the shape of the output pulses.

To achieve this goal, in a multivibrator containing an even number of cells that includes a key on a common emitter transistor, a threshold element on the second transistor whose collector is connected to the base of the first transistor, and the emitters of the second transistors of even cells through the first and odd cells specify the second the resistors are connected to the power bus and directly to the first and second plates of the time of the driving capacitor, two resistors connected in series and a diode connected in m are inserted into each cell Between the outputs of the keys of this and the previous cells, when the base of the second transistor of the cells is connected to the common terminals of the resistors.

In a multi-phase multivibrator in order to ensure launch from the first

5 cell base of the second transistor through the Zener diode connected to the common bus.

The drawing shows a schematic diagram of a multi-phase multivibrator,

HyperiVibrator contains an even number of 1-1-1-2P cells, each of which contains a 2-1-2-2p pn transistor and a 3-1-3-2P pn transistor, resistors 4-1 -4-2P, 5-1-5-2P, 6-1-6-2P; diode 7-1-7-2P.

The multivibrator also contains the time setting capacitor 8, the time setting resistors 9 and 10, stabilizer 11. The multi-phase multivibrator outputs 12-1-12-2p and is powered from the power supply bus 13. In this case, the collector of the transistor 3-1-3-2P of the threshold element is connected to the base of the transistor 2-1-2-n of the switch. The emitters of the 3-2-3-2P transistors of even cells through the first time are the driving resistor 10 and the emitters of the 3-1-3 transistors (2p-1) of odd cells through the driving time

0, the resistor 9 is connected to the power supply bus and the time of the driving capacitor 8 directly to the first and second plates. The input terminals are connected between the outputs of the transistors 2-1-2-n of the keys of this and the previous cells.

series-connected resistors 5-1-5-2, 6-1-6-2, diode 7-1-7-2.

The presence of the zener diode 11 fixes. The beginning of the operation of the multivibrate50. Pa with the first cell.

Multiphase multivibrator works as follows.

When the power is turned on, a current is generated through the resistor 9 junction emit55 s; ep-base of the transistor 3-1 first

cells and Zener diode 11, which leads to the opening of the transistors 3-1 and 2-1 of the first cell and its inclusion. The first cell will be held in the on state by the current through the resistor 9. The potential of the junction point of the emitters of the odd cells will be close to zero.

The transistors of the remaining cells will be closed. The voltage at output 12-1 will be close to zero, and at the outputs 12-2-12-2P of the remaining cells will be almost equal to the supply voltage. The voltage at the base of the second cell transistor 3-2 at this time will be determined by a voltage divider across the resistors 5-2 and 6-2 of the second cell (i.e., the second cell will be prepared for switching on).

Capacitor 8 will be charged through resistor 10.

When the voltage at the junction of resistor 10, capacitor 8 and emitters of even cells exceeds the voltage at the base of transistor 3-2 of the second cell, its emitter junction will be shifted in the forward direction, which will lead to the opening of the transistor. The collector current of transistor 3-3 will flow through the base-emitter junction of transistor 2-2 and open the latter, which will reduce the voltage at the output of the second cell and at the base of transistor 3-2 of this cell, therefore, the transistor 3-2 of the second cell is even more will open. This process is avalanche-like and ends with the saturation of a second transistor 2-2. The transistor 3-2 of the second cell will also be opened by the current through the open transistor 2-2, resistor 5-2, and the base-emitter junction of the transistor 3-2 t and resistor 10.

The voltage on the emitters of even cells abruptly decreases to zero. The voltage across the capacitor 8 cannot change abruptly due to the commutation law and therefore a negative surge voltage will occur on the emitters of odd cells, which will lead to the closing of the transistor 2-1 of the first cell and its inclusion.

0

The second cell will be held in the on state by the current flowing through the resistor Y. The potential of the junction point of the emitters of the even cells will be close to zero.

five

The output 12-2 of the second cell will have a low potential, and the output of the remaining cells will have a high potential.

At this point in time, the voltage at the base of the transistor 3-1 of the first cell will be determined by the voltage across the Zener diode 11, at the base of the transistor 3-3 of the third cell, the voltage will be determined by a divider on the resistors 5-3 and 6-3 of this cell and will be the lowest of all

5 odd cells

The capacitor 8 will start to re-run through the resistor 9 from the power supply bus 13.

When the voltage at the connection point of resistor 9, capacitor 8 and emitters of transistors of odd cells exceeds the voltage at the base of transistor 3-3 of the third cell, the third cell turns on, the second.

5 turns on and a fourth will be prepared for inclusion.

The process of turning on and off the remaining cells is similar.

Introduction to each cell of a multiphase multivibrator voltage divider on two resistors allows to improve the shape of the output pulses, since at the output of the cell prepared for switching on the voltage does not change at all.

Claims (2)

1. MULTI-PHASE MULTI-VIBRATOR containing an even number of cells, including a key on a transistor with a common emitter, a threshold element on a second transistor, the collector of which is connected to the base of the first transistor, and the emitters of the second transistors of the even cells through the first and odd through the second timing resistors are connected to power bus and directly - with the first and second plates of the timing capacitor, characterized in that, in order to improve the shape of the output pulses, each cell is introduced in series with union of two resistors and a diode connected between the outputs of the keys and the previous cell, the base of the second transistor cells connected with common terminals of resistors. 2. The multivibrator according to claim 1, characterized in that, in order to ensure starting C of the first cell, the base of the second transistor is connected via a zener diode to a common bus.