SU490261A1 - Pulse selector by duration - Google Patents

Description

selector operation is as follows .r.4.zom. ...

When the polo-fi pulse f / ax is input to the selector switch, transistor 2 is closed. The thyristor 10 continues to remain closed due to the absence of a signal at the control electrode. The charging circuit of capacitor 3 is broken and it begins to recharge across the circuit through the elements of automatic bias {resistor 11 and capacitor 12), the secondary winding of transformer 4 and resistor 13. The constant recharge time of capacitor 3 is selected based on the condition of the minimum () selectable pulse duration . The recharge process lasts for a time, which is determined by the duration of the input pulse, as well as the magnitude and rate of growth of the reverse relative to the initial voltage on the capacitor plates 3.

When the input impulse duration is min max, the capacitor 3 has time to discharge to zero (point a) and transistor 1 opens at the input. However, the direct blocking process will not occur until the turn-on signal is received at the control electrode of the thyristor 7. This signal is generated by terminating an input impulse / 7in when the transistor 2 is opened (point b). The condition must be met that the voltage on / on of the thyristor 7 at the control current / O is greater than the voltage of the power source.

At the output of the blocking generator, the impulse of the output voltage f / o appears, the duration of which is determined by the parameters of the block generator. Through the opened transistor 2, the circuit restores its original position.

 Provided that the duration of the nmiuols input ts imax selector works as follows.

When the voltage on the capacitor 3 reaches zero (point a), transistor 1 opens at the input, but remains closed at 1.1, the collector key has a key on the thyristor 7. Capacitor 3 continues to charge in the opposite polarity. At some value of Uc, dynistor 8 opens (point c), providing capacitor discharge

3 through a resistor 9. The opening of the dynistor 8 takes place in the dynamic 6c magnification mode, therefore / 7 on the dynamic small On the static given in the device passport and depends on the slew rate Uc on the capacitor 3. The dynistor 8 is selected from the condition that its t / on dynamic determines maximum) duration of the selected pulse. The discharge current of the capacitor 3 leads to a voltage drop across the resistor 9. This voltage serves as a control signal for the switch on the thyristor 10. The thyristor 10 opens and connects the right side of the capacitor 3 to the common side. Transistor 1

closes at the entrance. With the end of the capacitor discharge 3, dynistor 8 is turned off. The thyristor 10 continues to remain open, provided that its direct anode current exceeds the value of the on / off current.

in the current-voltage characteristic of the thyristor. This condition is provided by selecting the resistor 13. With the end of the input pulse, transistor 2 opens, which, by the bypass, the thyristor 10 turns it off and restores

initial position of the circuit.

Thus, the selector circuit responds by issuing an output pulse only to those input emulsions that, regardless of the nature of the sequence of their arrival.

have a duration of / limited by the time limits / tSh t "5 / max, and the duration of the output pulse does not depend on the duration of the input pulse.

Subject invention

Pulse selector and duration of auth. St. No. 307507, characterized in that. in order to release pulses with duration

enclosed in the specified interval, it contains the first additional thyristor, connected B of the collector circuit of the blocking generator transistor, while its control electrode is connected to the output of the input transistor, in parallel with which the second additional thyristor is connected, its control electrode is connected to the cathode of the additional diode connected a blocking generator parallel to the clock capacitor.

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