SU1368954A1 - Triple bridge flip-flop - Google Patents

Description

valuable twenty-first resistor and seventh diode - with the third input of the trigger, the base of the second transistor is connected through the twenty-second resistor

36895D

with the collector of the tenth transistor and

through the series-connected twenty-third resistor and the eighth diode - with the second trigger input.

one

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

The purpose of the invention is to increase the reliability of the trigger.

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

The threefold bridge trigger contains first 1, second 2, third 3 and fourth 4 transistors of the first conductivity type, the emitters of which are connected to the common bus, their bases through the first 5, second 6, third 7 and fourth 8 resistors are connected to common power The collectors of transistors 1 and 2 are connected respectively to the bases of transistors 3 and 4, the collectors of which are connected to the first 9 and second 10 outputs of the trigger and collectors of the fifth 11 and sixth 12 transistors of the second conductivity type, the emitters of which are connected to the power supply bus 13, and the bases through fifth 14 and above These 15 resistors are connected to the power supply bus 13, eighth 16 and seventh 17 transistors of the first conductivity type, ninth 18 and tenth 19 transistors of the second conductivity type, emitters of transistors 16 and 18 are connected to output 9 of the trigger and through the tenth resistor 20 connected to the bases of transistors 10 and 18, which are connected to the bases of transistors 17 and 19 through de-z to the tenth resistor 21, which are connected to output 10 of the trigger and emitters of transistors 17 and 19 through the ninth resistor 22, respectively; through eighth 23, seven 24 th, 25 and fourteen thirteenth resistors 26 to the bases of transistors 12, 11, 4 and 3. The first input of flip-flop 27 through the eleventh resistor 28 and a first diode 29 connected to the base tran

of the resistor 1, and through the twelfth resistor 30 and the second diode 31 - with the base of the transistor 2, the second input 32 of the flip-flop is connected via the fifteenth resistor 33 and the third diode 34 with the base of the transistor 3, and through the sixteenth resistor 35 and the fourth diode 36 - with the base of the transistor 16, the third trigger input 37 is connected via the seventeenth resistor 38 and through the fifth diode 39 to the base of transistor 4, and through the eighteenth resistor 40 and sixth diode 41 to the base of transistor 17, the base of transistor 1 is connected through the twentieth resistor 42 to the collector of transistor 18, and after the twenty first cut Side seventh diode 43 and 44 - to the input of flip-flop 37. The base of the transistor 2 is connected through the twenty-second resistor 45 to the collector of the transistor 19, and through the twenty-third resistor 46 and the eighth diode 47 to the input 32 of the flip-flop. A load 48 is connected to the ternary bridge trigger.

Trinity bridge trigger works as follows.

When the supply voltage is turned on, all the transistors of the ternary bridge trigger are closed, at the outputs 9 and 10 are equal potentials, there is no current in the load 48. This is the first steady state trigger.

If a positive pulse arrives at input 32, a current is generated through the diode 34 and a resistor 33, which opens the transistor Z. Potenchal at the output 9 decreases to almost zero, and a current occurs through the diode 36, resistor 35, the base-emitter junction of transistor 16 and the open transistor 3, which leads to the opening of the transistor 16. The collector current of the transistor 16 flows through the limiting resistor 23 and the base-emitter junction of the transistor 12, opening 31

the last one The potential at output 10 increases, current arises in load 48 as well as current through an emitter-to-base transition of transistor 19, resistor 21, a base-to-emitter transition of transistor 1 and an open transistor 3. Transistor 19 opens and its collector current through limiting resistor 26 holds transistor 3 in the open state after the end of the pulse at the input 32, the collector current of the transistor 19 through the resistor 45 opens the transistor 2,

Thus, the trigger from the first steady state switches to the second steady state, in which the output 9 is low and the output 10 is high potentials, a current flows in the load 48 in the direction from the output 10 to the output 9.

If the trigger is in the first steady state and a positive pulse arrives at input 37, then similarly, due to the symmetry of the device, it will be switched to the third steady state, in which the output 9 is high and the output 10 is low potentials in the load 48, a current flows in the direction from the output 9 to the output 10.

If the trigger is in the second steady state and a positive pulse arrives at input 37, a current occurs through the diode 39 and a resistor 38, which flows through the open transistor 2 and cannot open the transistor 4. At the same time, a current flows through the diode 44 and resistor 43, which opens transistor 1 and switches it to the saturation state. This leads to a decrease in the potential at the base of the transistor 3 (to a value of 0.15–0.25 V) and a reduction in the base current of transistor 3 to zero and the closure of the latter. The potential at output 9 increases, the current in the load decreases to zero. The current through the resistor 21 also decreases to zero; the transistors 16 and 19 are closed, which leads to the closing of both the transistor 12, the current through the resistor 45 disappears, which leads to the closing of the transistor 2, and the current of the pulse at the input. 37, flowing through the diode 39 and the resistor 38, after exiting the transistor 2 from saturation, flows through the base of the transistor 4 and opens the latter. This leads to a decrease to zero.

68954

potential at output 10 (transistor 12 is already closed by this time), current is generated through diode 41, resistor 40, base-to-emitter transition of transistor 17 and open transistor 4, transistor 17 opens and collector current through limiting resistor 24 opens transistor 11,

10 There is a current in the load of the opposite direction, as well as the current through the emitter-base transition of transistor 18, resistor 21, base-emitter transition of transistor 19, open trans15 transistor 4, the collector current of transistor I8 through transistor 42 opens transistor 1, and through resistor 25 holds transistor 4 in the open state after the end of the pulse at input 20 and 37.

Thus, the trigger switches from the second to the third steady state, and in the switching process all open transistors 3, 16, 12, 19, 2 are closed first, and only after that transistors 4, 17, II, 18, 1 are opened , which ensures the absence of through currents through transistors 3 and 11, 4 and 12.

30 If the trigger is in the third steady state and a positive pulse arrives at the input 32, then similarly, due to the symmetry of the device, the trigger switches 35 s from the third steady state to the second.

If the trigger is in the second steady state and a positive pulse arrives at input 27, then

40, a current is generated through the resistor 30 and the diode 31, which confirms the open state of the transistor 2, and the current through the resistor 28 and the diode 29 opens the transistor 1 and transfers it to

45 saturation. The potential at the base of transistor 3 decreases, which leads to the disappearance of the base current of transistor 3 and the closure of the latter. Disappears current in the load 48 and through the resistor

50 21, which leads to the closing of the transistors 16 and 19, and hence the transistor 12. After the end of the pulse at the input 27, the transistors 1 and 2 are also closed, and the trigger remains

55 in the first steady state, in which all the transistors of the trigger are closed,

If the trigger is in the third steady state and at input 27

Editor A. Kozoriz

Tehred A. Kravchuk

Order 314/55 Circulation 928 Subscription

VN1Sh1Sh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Proofreader M.Sharoshi

Claims (2)

1. A TRINITY BRIDGE TRIGGER containing eighteen resistors, six diodes, three inputs, first, second, third and fourth transistors of the first type of conductivity, the emitters of which are connected to a common bus, and the bases through the first, second, third and fourth resistors are respectively connected to a common bus, the collectors of the first and second transistors are connected respectively to the bases of the third and fourth transistors, the collectors of which are connected respectively to the first and second outputs of the trigger and collectors of the fifth and sixth transistors the second type of conductivity, the emitters of which are connected to the power bus, and the bases through the fifth and sixth resistors are respectively connected to the power bus and, respectively, through the seventh and eighth resistors to the collectors of the seventh and eighth transistors of the first type of conductivity, the bases of which are connected to the first terminals of the ninth and tenth of resistors, the first conclusions of the eleventh and twelfth resistors are connected to the first inputs of the ninth and tenth transistors of the second type of conductivity, which is due to the fact that To increase the reliability of the trigger, the nineteenth resistor and six diodes are introduced, the bases of the first and second transistors are connected through the first and second diodes to the second leads of the eleventh and twelfth resistors respectively, the second leads of the tenth and ninth resistors are connected to the first and second outputs and emitters, respectively, of the eighth , ninth and seventh, tenth transistors, collectors of the ninth and tenth transistors, respectively, through the thirteenth and fourteenth resistors are connected to the call by the second and first transistors, the second input is connected through the fifteenth resistor and the third diode in series to the base of the third transistor and through the sixteenth resistor and the fourth diode connected in series to the '.zaz of the eighth and ninth transistors, the third input is connected through the seventeenth resistor and the fifth diode connected to the base of the fourth transistor and through the eighteenth resistor and the sixth diode connected in series to the bases of the seventh and tenth transistors, the base of the seventh trans a torus through a nineteenth resistor connected to the base of the eighth transistor, 2. The trigger according to claim 1, with the fact that four resistors and two diodes are introduced, the base of the first transistor is connected through the twentieth resistor to the collector of the ninth transistor and through the resistor and the seventh diode connected in series with the twenty-first the third trigger input, the base of the second transistor is connected through a twenty-second resistor to the collector of the tenth transistor and through the twenty-third resistor and the eighth diode connected in series with the second trigger input.