SU1208604A2 - Ring counter - Google Patents

Abstract

The invention relates to a pulse technique and can be used in various systems of discrete automation. The purpose of the invention is to expand the field of application by reducing the requirements for the source of control pulses. Each bit of the ring counter contains a load resistor T, an extinguishing transistor 2, a thyristor 3, a starting transistor 4, a communication resistor 5, a bias resistor 6, additional resistors 7 and 8, a plus and minus bus 9 and 10, a switch 11, diode 12 and bus 13 run. 1 il. Invention - additional to the main author. St. № 902265. oe about {ii

Description

The invention relates to a pulse technique and can be used in various systems of discrete automation.

The purpose of the invention is to expand the field of application of the ring counter by reducing the requirements for the source of control pulses.

The drawing shows a schematic diagram of a ring counter.

The ring counter contains a load resistor .1, an extinguishing transistor 2, a thyristor 3, a starting transistor 4, a communication resistor 5, a bias resistor 6, the first and second additional resistors 7 and 8, and the positive and negative buses 9 and 10 , key 11, additional diode 12 and start bus 13.

The first terminal of the communication resistor 5 is connected to the anode of the thyristor 3 of the previous discharge, the cathode of the thyristor 3 is connected to the negative bus 10 of the power supply. The quenching transistor 2 emitter is connected to the thyristor 3 anode, the collector through the load resistor 1 to the positive power supply bus 9, and the base to the first output of the bias resistor 6, the second output of which is connected

To the collector of the quenching transistor 2 of the next bit. The base of the starting transistor 4 is connected to the second terminal of the first resistor 5 of the communication. Between the collector of the starting transistor 4 and the control electrode of the thyristor 3, the first additional resistor 7 is connected, and through the second additional resistor 8 and the additional diode 12 the collector of the starting transistor 4 is connected to the base of the quenching transistor.

The device works as follows.

In the initial state, the thyristors of all 3 bits (with the exception of the first one) are closed, the extinguishing transistor of the first discharge is opened with the help of the installation unit in the initial state (not shown), thus providing a circuit for the current flow of the thyristor 3 of the first discharge and prepare the circuit to turn on the thyristor

VNIIPI Order 300/60 Circulation 818 Subscription Fshshal ShSh Patent, Uzhgorod, Proektna St., 4

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3 second digits The thyristor 3 of the first discharge, being in the open state, ensures that the unlocking current of the base can flow only for the starting transistor 4 of the second discharge. When the key 11 is closed, the transistor 4 of the first discharge opens and the current passing through it opens the thyristor 3 of the second discharge. The thyristor 3 of the second discharge, when opened, ensures the flow of the unlocking current of the base of the quenching transistor 2 of the second discharge, which opens. In this case, the base of the quenching transistor 2 of the first discharge across the resistor 6 is shunted. However, this transistor does not close while the transistor 4 is open, allowing the base current of the transistor 2 to flow. Transistor 4 of the second discharge cannot open because its base-emitter junction is shunted emitter-collector junction of the transistor 4 of the first bit. When the switch 11 is turned off, the transistor 4 of the first discharge is turned off, turning off the transistor 2 of the first discharge, which ensures the switching off of the thyristor 3 of the first discharge. Thus, the first bit is turned off and the second bit is turned on.

Similarly, in subsequent closures of the key 11, the next bits of the ring counter are turned on.

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Claims (1)

Invention Formula Ring counter aut. St. No. 902265, characterized in that, in order to expand the scope of application by reducing the requirements for the source of control pulses, the first and second additional resistors and an additional diode are inserted into it, the first additional resistor is inserted between the starting transistor collector and the thyristor control electrode and through the second additional resistor and additional diode the collector of the starting transistor is connected to the base of the extinguishing transistor.