SU790185A1 - Pulse shaper - Google Patents

Description

one

The invention relates to a pulse technique and can be used in devices for pulsed power supply at the station, for various j devices of particle accelerators and for other needs of the national economy.

Various lg1mp schemes of rectangular impulse generators are known (submodulators), which are used to control an electron tube locked in the pause between working pulses by a rectifier of grid displacement.

However, the known lamp circuits of square-wave impulse generators, as compared with devices on semiconductor devices, have a shorter service life and worse mass-overall JQ indicators.

Also known is a pulse driver containing a power source, the first thyristor whose cathode is connected to the grid of the electron tube and 25 through the first resistor to the grid bias bus, second thyristor, choke, storage capacitor, the first lining of which is connected to the common bus, an additional thyristor.

additional capacitor, second resistor, connected between the first and second additional capacitor plates of the storage capacitor and through the third resistor connected to the power supply bus 2jf.

The purpose of the invention is the formation of pulses of control of an electron tube and the approximation of the shape of pulses to a rectangular, i.e. enhanced functionality.

The goal is achieved t & l that in the pulse shaper containing a power source, the first thyristor, the cathode of which is connected to the grid of the electronic spar and through the first resistor to the grid bias, the second thyristor, choke, storage capacitor, the first lining of which is connected to the common bus , additional thyristor, additional capacitor and the second resistor connected between the first plate of the additional and second plate of the storage capacitor and through the third resistor connected to the bus power point, the second plate of the additional capacitor through the second thyristor and

The choke is connected to the grid bias bus, the anode of the additional thyristor is connected to the second plate of the storage capacitor, and its cathode is connected to the second plate of the additional capacitor. FIG. 1 shows a pulse shaper circuit; in fig. 2 - time diagrams of voltages.

The device contains a power source connected to the terminal 1, the first thyristor 2, the cathode of which is connected to the grid of the electron tube 3 and through a resistor 4 to the capacitor 5 of the filter bias rectifier, the second thyristor b, the choke 7, the storage capacitor 8, the first plate of which an additional thyristor 9, an additional capacitor 10, the first resistor 11 connected to the first plate of the additional and second plate of the storage capacitor and through the charging resistor 12 to the plus source no. The second plate of the additional capacitor is connected via the second thyristor b and the choke 7 to the capacitor 5 of the bias rectifier filter. The anode of the additional thyristor 9 is connected to the second plate of the storage capacitor and its cathode is connected to the second plate of the additional capacitor.

In the time diagrams of the voltage, the triggering impulse ZI-1 is supplied to the second thyristor 6; trigger pulse ZI-2, arriving at the first thyristor 2; triggering impulse ZI-Z, supplied to the additional thyristor 9; impulse AND, voltage on the grid of the lamp 3, impulse AND voltage to turn off the first thyristor, pulse Id voltage at the anode of the additional thyristor-9.

The device works as follows.

In the initial state, all the thyristors of the pulse driver are locked. The electronic lamp 3 is locked across the grid by the bias voltage rectifier Un. The storage capacitor 8 is charged through the charging resistor 12 to the power supply voltage + EQ. The pulse generator is controlled by triggering pulses from an external oscillator, which determines the specific sequence of switching on || and storov-. With the arrival of the triggering pulse, the ZI-1 injects the second thyristor 6, resulting in a resonant charge of the capacitor 10. At the end of the charging process of the capacitor 10, the voltage applied to the anode of the additional thyristor 9 reaches twice the voltage of the power source EQ and rectifier bias voltage. At this, the preparation of the circuit for the formation of the output pulse is completed. Then, a ZI-2 pulse is applied to the control electrode of the first thyristor 2, delayed relative to the ZY-1 pulse for the time required for the resonant charge of the additional capacitor 10. As a result of switching on the first thyristor, a positive polarity is released on the resistor 4 equal to the sum of on the storage capacitor 8 and the capacitor 5 of the bias rectifier filter, and the grid of the electron tube 3 receives an excess voltage equal to the voltage on the storage capacitor 8. The duration of mpulsa determined by the delay time of the trigger pulse ZI-ZI-3 with respect to 2 pulses. As a result of the inclusion of an additional thyristor 9 and the discharge of an additional

0 of the capacitor 10 on the resistor 11 a pulse of negative polarity is released, turning off the first thyristor 2. The switching process is accompanied by the flow of the reverse current being switched off

5 of the thyristor and removal of charge from the input capacitance of the electron tube, which leads to a decrease in the duration of the rear front formed. momentum.

Using a new combination

elements favorably distinguish the proposed pulse shaper from the known one, since it allows to increase the sphere of application of the pulse shaper and eliminate the need to develop devices for controlling electronic tubes.

Claims (2)

1. Ivanov A. B., Sosnovkin L. N. Pulsed microwave transmitters. Ow. radio, 1956, pp. 527-530. 2. USSR author's certificate  558386, cl. H 03 K 5/01, 12.12.75,