SU1226623A1 - Device for generating bipolar signals from unipolar signals - Google Patents

Abstract

The invention relates to a pulse shaper and is intended for operation in automation devices and pulsed technology. The purpose of the invention is to increase the speed of the device by reducing the duration of the cutoff of the output pulses. For this purpose, a pulse transformer 6, transistors 7 and 8, diodes 13 and 14, and a resistive voltage divider 16 are introduced into the device. In addition, the device contains keys 1 and 2, input buses 3 and 4, a pulse transformer 5, output buses 9 and 10, diodes 11 and 12, and voltage divider 15. Diodes 11 and 13 protect transistors 7 and 8 from the effects of reverse voltage, and diodes 12 and 14 exclude load shunting by a circuit Q not working at the time of formation of the output pulse. 1 il. L f4 15 f6l 8 10 -o tc STR. V 15 7/12 - (4

Description

and 6, pnp and and 8, collectors of the first input, respectively

The invention relates to the manufacture of pulses and is intended for operation in automation devices and pulsed technology.

The purpose of the invention is to increase the speed of the device by reducing the duration of the cutoff of the output pulses by iaeHHH.

The drawing shows a diagram of the proposed devices

The device for generating bipolar signals from unipolar signals contains the first and second transistor switches 1 and 2, the inputs of which are connected to the first and second inputs by buses 3 and 4, and the primary windings of the pulse transformer 5 npp transistors 7 of which are connected to bus 9, and emitters

with the beginning of the secondary winding of the pulse transformer 5 and the end of the secondary winding. Pulse transformer 6, the second output bus 10, the first, second, third and fourth diodes 11-14, in which the cathodes of the diodes 11 and 12 are connected to the end of the secondary winding of the pulse transformer 5 and the anodes diodes 13 and 14 - from the beginning of the secondary winding of the pulse transformer 6, the anode of the diode 11 is connected via the resistor's voltage divider 15 to the emitter of the transistor 7, the base of which is connected to the midpoint of this voltage divider of the cathode 13 Ora resistive divider 16 tive voltage connected to the emitter of the transistor 8 whose base is connected to a midpoint of the voltage divider and the anode of the diode 12 and the cathode of the diode 14 are connected. with a second output bus 10,

The device works as follows.

When a pulse is applied to the input bus 3, the transistor switch closes and a current pulse is formed in the primary winding of the pulse transformer 5. An electromotive voltage of positive polarity develops in the secondary winding of the pulse transformer 5, and a current flows through the voltage divider 15 and the diode 11, which develops a voltage on the base of transistor 7 that unlocks the latter. As a result, the circuit closes: the beginning of the secondary winding of the transformer 5 - open circuit

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Sistor 7 — output bus 9 — load — output bus 10 — open diode 12 — end of transformer secondary winding 5. A positive polarity pulse is generated on the load. At the end of the input pulse, the transistor switch 1 opens, a negative-polar voltage EMF is formed in the secondary winding of the transformer 5, locking the transistor 7, and the load is disconnected from the secondary winding of the transformer 5. This leads to a sharp decrease in the cut-off time of the output pulse. At the same time, an increase in the discharge resistance of the inductance of the transformer 5 leads to a sharp decrease.

the time it takes to restore it L, All of this in general contributes to improving the speed of the device.

When an input pulse is applied to the input bus 4, all processes proceed in a similar way, except that a negative polarity pulse is generated in the load, since the current in the secondary winding of the transformer 6 flows through the circuit; the beginning of the secondary winding -, diode 14 - output bus, 10 - load - output bus 9 - open transistor 8 - the end of the secondary winding.

Diodes 11 and 13 prevent base-to-emitter junctions of transistors 7 and 8 from being affected by reverse voltage, and diodes 12 and 14 exclude load shunting by a circuit not currently participating in the formation of a primary pulse.

In comparison with the known, the proposed device will allow a 2-3-fold increase in its speed when forming a series of unipolar pulses.

Formula Invention

A device for generating bipolar signals from unipolar signals containing a pulse transformer, the first and second transistor switches, whose inputs are connected to the first and second input buses, respectively, whose emitters are connected to the common bus, and the collector load of the first transistor switch pulse transformer, the first resistive voltage divider and the first and

A second diode with combined cathodes, characterized in that in order to improve speed, a second pulse transformer is introduced into it, the primary winding of which serves as the collector load of the second transistor switch, two transistors of different conductivity type, the third, fourth diodes and the second resistive divider The collectors of transistors of different types of conductivity are connected to the first output bus, the emitter of a pnp transformer is connected to the beginning of the secondary winding of the first pulse transformer, and emit The ep pp transistor is connected to the end of the secondary winding of the second pulse transformer, the cathodes of the first and second diodes are connected to the end of the secondary winding

Editor N. Rogulich

Compiled by S. Ageev

Tehred V. Kadar Proofreader M. Samborska

Order 2146/57 Circulation 816 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 1.13035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

26623

the third and fourth diodes with the beginning of the secondary winding of the pulse transformer, the anode of the first diode through the first resistive voltage divider is connected to the emitter of a pnp transistor, the base of which is connected to the output of the first divider voltage, the cathode of the third diode through the second resistive voltage divider is connected to the emitter of pnp transistor, the base of which is connected to the output of the second divider

the voltages, and the anode of the second and the cathode of the fourth diode are connected to the second output bus; the beginnings of the primary windings of the first and second pulse transformers are connected to the positive bus of the power source.

Claims (1)

Claim A device for generating bipolar signals from unipolar signals, comprising a pulse transformer, first and second transistor switches, the inputs of which are connected to the first and second input buses, respectively, the emitters of which are connected to a common bus, and the primary windings of the first pulse transformer are the collector load of the first transistor, the first resistive voltage divider and the first and second diodes with integrated cathodes, characterized in that, in order to improve performance, it is introduced the second pulse transformer, the primary winding of which serves as the collector load of the second transistor switch, two transistors of different types of conductivity, the third, fourth diodes and a second resistive voltage divider, 10 collectors of transistors of different types of conductivity are connected to the first output bus, the emitter p- the pnp transistor is connected to the beginning of the secondary winding of the first pulse transformer 1, and the emitter of the pnp transistor is connected to the end of the secondary winding of the second pulse transformer, the cathodes of the first the second diodes are connected to the end of the secondary winding 2 of the first pulse transformer, and the anodes of the third and fourth diodes with the beginning of the secondary winding of the second pulse transformer, the anode of the first diode through the first resistive voltage divider is connected to the emitter of the rpn transistor, the base of which is connected to the output of the first a voltage divider, the cathode of the third diode through a second resistive voltage divider is connected to the emitter of a pnp transistor, the base of which is connected to the output of the second voltage divider ^, and the anode is ohm and the cathode of the fourth diode are connected to the second output bus, the beginning of the primary windings of the first and second pulse transformers are connected to the positive bus of the power source.