SU1322424A1 - Thyristor flip-flop - Google Patents

Abstract

The invention relates to a pulse technique and can be used in automation. The invention provides an increase in the trigger speed and the possibility of its operation without an additional device for resetting it and generating output short pulses on a low-resistance load, which is necessary for reliable operation of subsequent stages. The trigger is made on two transistors 7 and 11, two thyristors 1 and 4, a diode 5 and three resistors. Since the time of returning this trigger to the initial state is almost equal to the closing time of the thyristor, the invention makes it possible to increase the trigger speed by a factor of 3-5 compared with the known device. Additional advantages of the trigger include ease of its implementation ii the absence of a switching capacitor, which facilitates the integral execution of the trigger. When counting pulses, the trigger consumes twice less energy than the base object, and no energy is consumed in the initial state. . 1 il. with/)

Description

The invention relates to pulse technology and can be used in automation.

The aim of the invention is to increase the speed and provide the possibility of the trigger operation without an additional device for resetting and forming output short pulses.

The drawing shows a diagram of the proposed device.

The trigger contains the first thyristor 1, through the first resistor 2 connected to the positive power supply bus 3, the second thyristor 4, the anode of which is connected to the bus 3, and the control electrode to the cathode of the diode 5 The control electrode of the thyristor 1 and the anode of the diode 5 are connected to control input 6. The cathode of the thyristor 1 is connected to the emitter of the first transistor 7, the collector of which is connected to the negative power supply bus 8, and its base is connected via the second 9 and third 10 resistors in series to the same bus 8, the cathode of the thyristor 4 is connected to the emitter of the second transistor 11, the collector of which connected to the common point of resistors 9 and 10, and its base - to the common point of thyristor 1 and resistor 2.

Resistors may be included in the anode of the second thyristor and the collector of the first transistor in order to obtain additional signal outputs in the form of a meander. Thyristor anode loads and transistor collector loads to smooth the edges of the output pulses can be bridged by capacitors.

The limiting resistors can be included in the collector of the first transistor and in the collector j emitter and base of the second transistor.

The device works as follows.

In the initial state, the thyristors 1 and 4 and the transistors 7 and 11 are closed. The quiescent current is zero. This is the first steady state trigger. When a pulse is applied to control input 6, the control current flows through the control electrode of the thyristor 1, the emitter junction is the base of the transistor 7 and the resistors 9 and 10. In the thyristor 1, the opening process starts, the current through the other transistor 7 increases as long as the thyristor 1 completely not from

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is hidden, and transistor 7 does not go into deep saturation.

As for thyristor 4, the control current through its control electrode is zero as long as transistor 11 is closed. The latter opens when the potential of the anode of thyristor 1 drops. Since the thyristor 1 opens with some delay relative to the control pulse, the current through the emitter-base junction of the transistor 11 can go only with a delay relative to the same pulse. As a result, by the time thyristor 4 is able to open, the control impulse is over. Therefore, after the first control pulse, the trigger goes to the second steady state: the thyristor 1 and the transistor 7 are open, the thyristor 4 and the transistor 1 1 are closed.

When the second pulse is applied to the input 6, the control current flows through the control electrode of the thyristor 4, the emitter-base junction of transistor 11, thyristor 1, transistor 7. The opening process starts in thyristor 4, and the current generating through resistor 10 begins to flow through it too the voltage drop, which tends to close the transistor 7. However, since it is deeply saturated, this voltage is still not long enough. decreasing the current through the transistor 7. On the other hand, increasing the current. and through the thyristor 4 leads to an increase in the current through the base of the transistor 7 and the thyristor 1. The transistor I1 opens fully and the voltage drop across the resistor 10 increases. Therefore, the transistor 7 begins to close. This reduces the base current of the transistor 11, however, as previously, the transistor 7 is in a deep state of 1; therefore, the current through the thyristor 4 is almost not affected. The opening process of the thyristor 4 continues, the current through it and the transistor 11 increases, which leads to even greater locking of the transistor 7.

Ultimately, this transistor is completely locked, so that the current through the thyristor 1 and the base of the transistor 11 becomes equal to zero. Therefore, record. The transistor 11 is also on, and in thyristors 1 and 4, the locking processes begin. After the time required to stop the transients in

The thyristor tgtiKA trigger fully returns to its initial state, and on resistor 10 there is a powerful pulse with a duration of several microseconds and an amplitude almost equal to the voltage of the power source.

If, as already mentioned, a resistor is turned on in the collector of transistor 7, the output can be removed from it

the signal in the form of a meander, as in a conventional trigger, the same signal is removed from the thyristor anode 1.

Thus, in comparison with the known, the proposed trigger does not require an additional device for setting to the initial position and forming a short pulse at a low-impedance load, which is necessary for reliable operation of subsequent stages.

Since the return time to the initial state is approximately equal to the thyristor closing time, the proposed device is 3-5 times faster than the known one.

Additional positive effects include the simplicity of the proposed device and the absence of a switching capacitor, which facilitates the integral performance of the trigger. In addition, when counting pulses, the proposed device consumes half the energy than the known, and in the initial state does not consume any energy at all.

Editor N.Lazarenko

Order 2875/52 Circulation 901 Subscription

VNIIPI USSR State Committee

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

; Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

Formula of the invention A thyristor trigger containing a first thyristor, the anode of which is connected via a first resistor to a positive power line, a second thyristor, a diode whose anode is connected to a control input, a second and third resistors, and a negative power supply, as distinguished from that, in order to increase the speed and enable the trigger to operate without an additional device for resetting and generating output pulses, two transistors were additionally introduced, the emitter of the first of them being connected to the cathode of the first thyristor, its collector is connected to the negative power line and the base through connected in series the second and third resistors are connected to the same bus, the emitter of the second transistor is connected to the cathode of the second thyristor, its collector is connected to the common switching on the second and third resistor and the trigger output, and the base with the anode of the first thyristor, the anode of the second thyristor is directly connected to the positive power line, and its control electrode is connected to the cathode of the diode, the control electrode of the first thyristor and the anode of the diode. Compiled by P. Beztemj Tehred I.Popovich Proofreader I.Musk