SU1226617A1 - Ternary bridge flip-flop - Google Patents

Abstract

The invention relates to a pulse technique, in particular to devices with several stable states. The purpose of the invention is to increase the efficiency and reliability of the trigger by simplifying it and eliminating the possibility of through currents with increasing supply voltage. For this purpose, diodes 33 and 34 are introduced into the trigger. The trigger contains transistors 1-6 of the first conductivity type, zener diodes 11 and 12, transistors 13-16 of direct conductivity, resistors. A symmetric load 35 and asymmetrical loads 36 and 37 can be connected to the trigger. 1 Il. 1 (L I 2J ISD to O5 O) 30

Description

one

The invention relates to a pulse technique, namely to devices with several stable states.

The purpose of the invention is to increase efficiency and reliability in operation by simplifying and eliminating the possibility of through currents with increasing supply voltage.

The drawing shows a schematic diagram of a ternary bridge trigger.

The ternary bridge trigger contains the first, second, third, fourth, fifth and sixth transistors 1-6 of the first conductivity type, the emitters of transistors 1-4 are connected to a common bus, their bases are through the first, second, third, and fourteen resistors 7 and 8, 9 and 10 are connected to a common bus, the bases of transistors 1 and 2 are connected to the emitters of transistors 5 and 6, the bases of which are connected. with collectors of transistors 3 and 4 and the anodes of the first and second zener diodes 11 and 12, the seventh and eighth, ninth and tenth transistors 13-16 of direct conductivity, the bases of transistors 13 and 14 through the sixth and resistors 17 and 18 are connected to the power supply bus 19 and the emitters of transistors 13 and 14, the collectors of which are connected to the first and second inputs 20 and 21 and the collectors of transistors 1 and 2, the bases and collectors of transistors 15 and 16 are connected respectively to the collectors and bases of transistors 5 and 6, and the emitters of transistors 15 and 16 are through dec - tsh and eleventh resistors 22 and 23 by They are connected to the bases of transistors 14 and 13, the bases of transistors 3 and 4 are connected to the first inputs 26 through twelfth and thirteen resistors 24 and 25 and connected to the second and third inputs 29 and 30 via the eighth and ninth resistors The fourth and fourth resistors 31 and 32 are connected to the cathode of zener diodes 12 and 11, which through the first and second diodes 33 and 34 are connected to the collector of transistors 1 and 2 "A balanced bridge 35 and asymmetrical loads 36 and 37 can be connected to the ternary bridge tpHrrepy,

Trinity bridge trigger works as follows.

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When the supply voltage is switched on and if at the inputs 29 and 30 low potentials the three-way bridge trigger is set to the first stable

5, the state in which all transistors are closed, at the outputs 20 and 21 are the same potentials, there is no current in the loads 35-37.

If a positive pulse is applied to the input 29, then the current through the resistor 27 opens the transistor 3, and the current through the resistor 31 and the zener diode 12 opens the transistor 6, which leads to an avalanche-like opening

  and the saturation of transistors 6 and 16 due to the positive feedback between the collectors and the bases of these transistors. A current is generated through the resistor 23 and the saturated transistors 6 and 16, which opens and switches the transistors 2 and 13 into the estimated state. There is a current in the load 35, in the direction from the output 20 to the output 21, and in the load 37.

25 Output potential 20 is high, and output 21 is low. The trigger is set to a second steady state in which transistors 2, 13, 6, and 16 are open. After the end 30, no pulse at the input 29 of the transistor 3 is closed.

If in the first steady state a positive pulse arrives at input 30, then in the same way,

3 "j due to the symmetry of the device, the trigger is set to the third steady state, in which transistors 1, 14, 5 and 15 are open and the rest are closed, at output 20 - low, on

40 output 21 - high potentials, and the current in the load 35 flows in the direction from the output 21 to the output 20, in the load 36 there will also be a current.

If the ternary bridge trigger is in the second steady state and a positive pulse is applied to the input 30, then transistor 4 opens, and transistor 5 cannot open yet, because transistor 2 is open and through the diode 34 pgunts the current flowing through the resistor 32. An open transistor 4 reduces the potential at the base of transistor 6, which leads to the avalanche-like closing of transistors 6 and 16 and the current through the resistor 23 to disappear, which leads to the closing of transistors 2 and 13. The potential at output 21 increases and when it exceeds on The breakdown of Zener diode 11 and threshold voltages at the bases of transistors 5 and 1, and this can happen when the dissolution of minority carriers ends in the bases of transistors 2 and HZ, the Zener diode 11 pierces and opens the transistor 5. The transistors 5 and 15 switch into a saturated state The current flowing through these transistors and resistor 22 will open and switch transistors 1 and 14 to saturation mode, i.e. the trigger will be switched to the third steady state. When switching a trigger, no end-to-end currents can occur, because at the first stage open transistors 2 and 13 almost completely close, and only then transistors 5, 15, 1 and 14 can turn on if the trigger is in the third steady state and a positive impulse is received the input 29, then in a similar manner, due to the symmetry of the device, it will be switched to the second steady state.

If the trigger is in the second steady state and a positive pulse arrives at input 26, then transistor 4 opens and enters the saturation, the potential at the base of transistor 6 decreases, transistors 6

30 of the first and fifth resistors, the seventh-eighth, ninth and tenth transistors of the second type of conductivity, of the seventh and eighth transistors; cut the sixth and seventh resistors with

40

and 16 will avalanche close, the current through resistor 23 will disappear and close to the power bus and emitter with transistors 2 and 13, and therefore the trigger will switch to the first steady state.

If the trigger is in the third steady state and a positive pulse arrives at input 26, then similarly, due to the symmetry of the device, it will be switched to the first steady state.

The efficiency improvement in the proposed device is achieved due to the fact that the diagonal transistors (1 and 14, 2 and 13) are held in saturation with the same current, and in the known device - with two different ones, and also 50 due to the reduction of through currents through vertical transistors (1 and 13, 2 and 14).

The reliability of the bridge trigger is increased due to the fact that Zener diodes (existing in the known device) are excluded in 55 feedback circuits, and therefore when changing the seventh and eighth transistors, the collectors of which are connected respectively to the first and second outputs of the trigger and the first and second collectors the second transistor, the second and third inputs are connected to the first terminals of the eighth and ninth resistors, characterized in that in order to increase the reliability in operation, two diodes connected between the cathodes of the first and of the second and first outputs, the bases and collectors of the ninth and tenth transistors are connected respectively to the collectors and the bases of the fifth and sixth transistors, the emitters of the ninth and tenth transistors are connected to the bases through the tenth and eleventh transistors eighth and seventh transistors, the base of the third and fourth transistors

Power supply voltage The magnitude of the saturated transistor current varies in proportion to the load currents, and also by eliminating the through currents that at high switching frequencies can lead to overheating and failure of the output (1,2,13 and 14) transistors.

Claims (1)

Invention Formula A ternary bridge trigger containing three inputs, the first, second, third, fourth, fifth and sixth traizistors of the first conductivity type, the emitters of the first, second, third and fourth transistors are connected to the common base bus of the first, second and third transistors respectively through the first, second and the third resistors are connected to the common bus, the bases of the first and second transistors are connected respectively to the emitters of the fifth and sixth transistors, the bases of which are connected respectively to the collectors of the third and fourth transistors and the anodes of the first and second zener diodes, the cathodes of which are connected to the first terminals of the fourth and fifth resistors, the seventh, eighth, ninth and tenth transistors of the second conductivity type, the base of the seventh and eighth transistors through the sixth and seventh resistors connect. Bus power supply and emitters Bus power supply and emitters the seventh and eighth transistors, the collectors of which are connected respectively to the first and second outputs of the trigger and the collectors of the first and second transistors, the second and third inputs are connected to the first terminals of the eighth and ninth resistors, characterized in that, in order to increase reliability in operation, Two diodes are inserted, connected between the cathodes of the first and second zener diodes and the second and first outputs, the bases and collectors of the ninth and tenth transistors are connected respectively to the collectors and the bases of the fifth and sixth transistors, the emitters of the ninth and tenth transistors through the tenth and eleventh resistors are connected respectively to the bases of the eighth and seventh transistors, the base of the third and fourth transistors through 5122 (.617 The twelfth and thirteenth resistors, respectively, with the second ones, are connected to the first input with the triggering switches of the fifth and fourth resistors, respectively, connected to the second, and the base of the fourth transistor Eye of the conclusions of the eighth and ninth re-through the fourteenth resistor of connectors, the second and third inputs are connected to the common bus.